root / tcg / tcg.c @ 1ff0a2c5
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/*
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* Tiny Code Generator for QEMU
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*
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* Copyright (c) 2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/* define it to use liveness analysis (better code) */
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#define USE_LIVENESS_ANALYSIS
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#define USE_TCG_OPTIMIZATIONS
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#include "config.h" |
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/* Define to jump the ELF file used to communicate with GDB. */
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#undef DEBUG_JIT
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#if !defined(CONFIG_DEBUG_TCG) && !defined(NDEBUG)
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/* define it to suppress various consistency checks (faster) */
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#define NDEBUG
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#endif
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#include "qemu-common.h" |
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#include "cache-utils.h" |
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#include "host-utils.h" |
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#include "qemu-timer.h" |
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/* Note: the long term plan is to reduce the dependancies on the QEMU
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CPU definitions. Currently they are used for qemu_ld/st
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instructions */
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#define NO_CPU_IO_DEFS
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#include "cpu.h" |
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#include "tcg-op.h" |
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#if TCG_TARGET_REG_BITS == 64 |
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# define ELF_CLASS ELFCLASS64
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#else
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# define ELF_CLASS ELFCLASS32
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#endif
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#ifdef HOST_WORDS_BIGENDIAN
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# define ELF_DATA ELFDATA2MSB
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#else
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# define ELF_DATA ELFDATA2LSB
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#endif
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#include "elf.h" |
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/* Forward declarations for functions declared in tcg-target.c and used here. */
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static void tcg_target_init(TCGContext *s); |
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static void tcg_target_qemu_prologue(TCGContext *s); |
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static void patch_reloc(uint8_t *code_ptr, int type, |
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tcg_target_long value, tcg_target_long addend); |
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static void tcg_register_jit_int(void *buf, size_t size, |
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void *debug_frame, size_t debug_frame_size)
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__attribute__((unused)); |
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/* Forward declarations for functions declared and used in tcg-target.c. */
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static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str); |
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static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg1, |
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tcg_target_long arg2); |
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static void tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg); |
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static void tcg_out_movi(TCGContext *s, TCGType type, |
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TCGReg ret, tcg_target_long arg); |
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static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args, |
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const int *const_args); |
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static void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg, TCGReg arg1, |
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tcg_target_long arg2); |
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static int tcg_target_const_match(tcg_target_long val, |
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const TCGArgConstraint *arg_ct);
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TCGOpDef tcg_op_defs[] = { |
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#define DEF(s, oargs, iargs, cargs, flags) { #s, oargs, iargs, cargs, iargs + oargs + cargs, flags }, |
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#include "tcg-opc.h" |
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#undef DEF
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}; |
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const size_t tcg_op_defs_max = ARRAY_SIZE(tcg_op_defs);
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static TCGRegSet tcg_target_available_regs[2]; |
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static TCGRegSet tcg_target_call_clobber_regs;
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/* XXX: move that inside the context */
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uint16_t *gen_opc_ptr; |
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TCGArg *gen_opparam_ptr; |
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static inline void tcg_out8(TCGContext *s, uint8_t v) |
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{ |
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*s->code_ptr++ = v; |
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} |
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static inline void tcg_out16(TCGContext *s, uint16_t v) |
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{ |
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*(uint16_t *)s->code_ptr = v; |
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s->code_ptr += 2;
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} |
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static inline void tcg_out32(TCGContext *s, uint32_t v) |
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{ |
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*(uint32_t *)s->code_ptr = v; |
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s->code_ptr += 4;
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} |
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/* label relocation processing */
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static void tcg_out_reloc(TCGContext *s, uint8_t *code_ptr, int type, |
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int label_index, long addend) |
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{ |
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TCGLabel *l; |
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TCGRelocation *r; |
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l = &s->labels[label_index]; |
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if (l->has_value) {
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/* FIXME: This may break relocations on RISC targets that
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modify instruction fields in place. The caller may not have
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written the initial value. */
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patch_reloc(code_ptr, type, l->u.value, addend); |
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} else {
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/* add a new relocation entry */
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r = tcg_malloc(sizeof(TCGRelocation));
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r->type = type; |
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r->ptr = code_ptr; |
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r->addend = addend; |
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r->next = l->u.first_reloc; |
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l->u.first_reloc = r; |
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} |
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} |
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static void tcg_out_label(TCGContext *s, int label_index, void *ptr) |
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{ |
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TCGLabel *l; |
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TCGRelocation *r; |
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tcg_target_long value = (tcg_target_long)ptr; |
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l = &s->labels[label_index]; |
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if (l->has_value)
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tcg_abort(); |
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r = l->u.first_reloc; |
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while (r != NULL) { |
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patch_reloc(r->ptr, r->type, value, r->addend); |
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r = r->next; |
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} |
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l->has_value = 1;
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l->u.value = value; |
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} |
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int gen_new_label(void) |
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{ |
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TCGContext *s = &tcg_ctx; |
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int idx;
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TCGLabel *l; |
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if (s->nb_labels >= TCG_MAX_LABELS)
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tcg_abort(); |
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idx = s->nb_labels++; |
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l = &s->labels[idx]; |
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l->has_value = 0;
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l->u.first_reloc = NULL;
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return idx;
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} |
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#include "tcg-target.c" |
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/* pool based memory allocation */
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void *tcg_malloc_internal(TCGContext *s, int size) |
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{ |
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TCGPool *p; |
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int pool_size;
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if (size > TCG_POOL_CHUNK_SIZE) {
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/* big malloc: insert a new pool (XXX: could optimize) */
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p = g_malloc(sizeof(TCGPool) + size);
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p->size = size; |
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p->next = s->pool_first_large; |
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s->pool_first_large = p; |
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return p->data;
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} else {
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p = s->pool_current; |
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if (!p) {
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p = s->pool_first; |
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if (!p)
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goto new_pool;
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} else {
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if (!p->next) {
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new_pool:
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pool_size = TCG_POOL_CHUNK_SIZE; |
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p = g_malloc(sizeof(TCGPool) + pool_size);
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p->size = pool_size; |
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p->next = NULL;
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if (s->pool_current)
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s->pool_current->next = p; |
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else
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s->pool_first = p; |
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} else {
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p = p->next; |
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} |
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} |
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} |
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s->pool_current = p; |
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s->pool_cur = p->data + size; |
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s->pool_end = p->data + p->size; |
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return p->data;
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} |
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void tcg_pool_reset(TCGContext *s)
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{ |
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TCGPool *p, *t; |
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for (p = s->pool_first_large; p; p = t) {
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t = p->next; |
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g_free(p); |
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} |
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s->pool_first_large = NULL;
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s->pool_cur = s->pool_end = NULL;
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s->pool_current = NULL;
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} |
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void tcg_context_init(TCGContext *s)
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{ |
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int op, total_args, n;
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TCGOpDef *def; |
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TCGArgConstraint *args_ct; |
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int *sorted_args;
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memset(s, 0, sizeof(*s)); |
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s->nb_globals = 0;
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/* Count total number of arguments and allocate the corresponding
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space */
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total_args = 0;
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for(op = 0; op < NB_OPS; op++) { |
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def = &tcg_op_defs[op]; |
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n = def->nb_iargs + def->nb_oargs; |
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total_args += n; |
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} |
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args_ct = g_malloc(sizeof(TCGArgConstraint) * total_args);
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sorted_args = g_malloc(sizeof(int) * total_args); |
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for(op = 0; op < NB_OPS; op++) { |
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def = &tcg_op_defs[op]; |
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def->args_ct = args_ct; |
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def->sorted_args = sorted_args; |
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n = def->nb_iargs + def->nb_oargs; |
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sorted_args += n; |
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args_ct += n; |
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} |
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tcg_target_init(s); |
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} |
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void tcg_prologue_init(TCGContext *s)
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{ |
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/* init global prologue and epilogue */
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s->code_buf = code_gen_prologue; |
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s->code_ptr = s->code_buf; |
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tcg_target_qemu_prologue(s); |
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flush_icache_range((tcg_target_ulong)s->code_buf, |
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(tcg_target_ulong)s->code_ptr); |
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} |
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void tcg_set_frame(TCGContext *s, int reg, |
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tcg_target_long start, tcg_target_long size) |
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{ |
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s->frame_start = start; |
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s->frame_end = start + size; |
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s->frame_reg = reg; |
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} |
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void tcg_func_start(TCGContext *s)
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{ |
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int i;
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tcg_pool_reset(s); |
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s->nb_temps = s->nb_globals; |
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for(i = 0; i < (TCG_TYPE_COUNT * 2); i++) |
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s->first_free_temp[i] = -1;
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s->labels = tcg_malloc(sizeof(TCGLabel) * TCG_MAX_LABELS);
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s->nb_labels = 0;
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s->current_frame_offset = s->frame_start; |
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#ifdef CONFIG_DEBUG_TCG
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s->goto_tb_issue_mask = 0;
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#endif
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s->gen_opc_ptr = s->gen_opc_buf; |
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s->gen_opparam_ptr = s->gen_opparam_buf; |
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#if defined(CONFIG_QEMU_LDST_OPTIMIZATION) && defined(CONFIG_SOFTMMU)
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/* Initialize qemu_ld/st labels to assist code generation at the end of TB
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for TLB miss cases at the end of TB */
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s->qemu_ldst_labels = tcg_malloc(sizeof(TCGLabelQemuLdst) *
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TCG_MAX_QEMU_LDST); |
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s->nb_qemu_ldst_labels = 0;
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#endif
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} |
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static inline void tcg_temp_alloc(TCGContext *s, int n) |
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{ |
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if (n > TCG_MAX_TEMPS)
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tcg_abort(); |
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} |
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static inline int tcg_global_reg_new_internal(TCGType type, int reg, |
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const char *name) |
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{ |
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TCGContext *s = &tcg_ctx; |
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TCGTemp *ts; |
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int idx;
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#if TCG_TARGET_REG_BITS == 32 |
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if (type != TCG_TYPE_I32)
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tcg_abort(); |
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#endif
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if (tcg_regset_test_reg(s->reserved_regs, reg))
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tcg_abort(); |
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idx = s->nb_globals; |
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tcg_temp_alloc(s, s->nb_globals + 1);
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ts = &s->temps[s->nb_globals]; |
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ts->base_type = type; |
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ts->type = type; |
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ts->fixed_reg = 1;
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ts->reg = reg; |
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ts->name = name; |
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s->nb_globals++; |
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tcg_regset_set_reg(s->reserved_regs, reg); |
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return idx;
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} |
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TCGv_i32 tcg_global_reg_new_i32(int reg, const char *name) |
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{ |
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int idx;
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idx = tcg_global_reg_new_internal(TCG_TYPE_I32, reg, name); |
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return MAKE_TCGV_I32(idx);
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} |
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TCGv_i64 tcg_global_reg_new_i64(int reg, const char *name) |
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{ |
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int idx;
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idx = tcg_global_reg_new_internal(TCG_TYPE_I64, reg, name); |
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return MAKE_TCGV_I64(idx);
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} |
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static inline int tcg_global_mem_new_internal(TCGType type, int reg, |
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tcg_target_long offset, |
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const char *name) |
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{ |
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TCGContext *s = &tcg_ctx; |
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TCGTemp *ts; |
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int idx;
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idx = s->nb_globals; |
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#if TCG_TARGET_REG_BITS == 32 |
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if (type == TCG_TYPE_I64) {
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char buf[64]; |
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tcg_temp_alloc(s, s->nb_globals + 2);
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ts = &s->temps[s->nb_globals]; |
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ts->base_type = type; |
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ts->type = TCG_TYPE_I32; |
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ts->fixed_reg = 0;
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ts->mem_allocated = 1;
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ts->mem_reg = reg; |
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#ifdef TCG_TARGET_WORDS_BIGENDIAN
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ts->mem_offset = offset + 4;
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#else
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ts->mem_offset = offset; |
383 |
#endif
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pstrcpy(buf, sizeof(buf), name);
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pstrcat(buf, sizeof(buf), "_0"); |
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ts->name = strdup(buf); |
387 |
ts++; |
388 |
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ts->base_type = type; |
390 |
ts->type = TCG_TYPE_I32; |
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ts->fixed_reg = 0;
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ts->mem_allocated = 1;
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ts->mem_reg = reg; |
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#ifdef TCG_TARGET_WORDS_BIGENDIAN
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ts->mem_offset = offset; |
396 |
#else
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ts->mem_offset = offset + 4;
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#endif
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pstrcpy(buf, sizeof(buf), name);
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pstrcat(buf, sizeof(buf), "_1"); |
401 |
ts->name = strdup(buf); |
402 |
|
403 |
s->nb_globals += 2;
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} else
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#endif
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{ |
407 |
tcg_temp_alloc(s, s->nb_globals + 1);
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ts = &s->temps[s->nb_globals]; |
409 |
ts->base_type = type; |
410 |
ts->type = type; |
411 |
ts->fixed_reg = 0;
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ts->mem_allocated = 1;
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ts->mem_reg = reg; |
414 |
ts->mem_offset = offset; |
415 |
ts->name = name; |
416 |
s->nb_globals++; |
417 |
} |
418 |
return idx;
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} |
420 |
|
421 |
TCGv_i32 tcg_global_mem_new_i32(int reg, tcg_target_long offset,
|
422 |
const char *name) |
423 |
{ |
424 |
int idx;
|
425 |
|
426 |
idx = tcg_global_mem_new_internal(TCG_TYPE_I32, reg, offset, name); |
427 |
return MAKE_TCGV_I32(idx);
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428 |
} |
429 |
|
430 |
TCGv_i64 tcg_global_mem_new_i64(int reg, tcg_target_long offset,
|
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const char *name) |
432 |
{ |
433 |
int idx;
|
434 |
|
435 |
idx = tcg_global_mem_new_internal(TCG_TYPE_I64, reg, offset, name); |
436 |
return MAKE_TCGV_I64(idx);
|
437 |
} |
438 |
|
439 |
static inline int tcg_temp_new_internal(TCGType type, int temp_local) |
440 |
{ |
441 |
TCGContext *s = &tcg_ctx; |
442 |
TCGTemp *ts; |
443 |
int idx, k;
|
444 |
|
445 |
k = type; |
446 |
if (temp_local)
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k += TCG_TYPE_COUNT; |
448 |
idx = s->first_free_temp[k]; |
449 |
if (idx != -1) { |
450 |
/* There is already an available temp with the
|
451 |
right type */
|
452 |
ts = &s->temps[idx]; |
453 |
s->first_free_temp[k] = ts->next_free_temp; |
454 |
ts->temp_allocated = 1;
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assert(ts->temp_local == temp_local); |
456 |
} else {
|
457 |
idx = s->nb_temps; |
458 |
#if TCG_TARGET_REG_BITS == 32 |
459 |
if (type == TCG_TYPE_I64) {
|
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tcg_temp_alloc(s, s->nb_temps + 2);
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ts = &s->temps[s->nb_temps]; |
462 |
ts->base_type = type; |
463 |
ts->type = TCG_TYPE_I32; |
464 |
ts->temp_allocated = 1;
|
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ts->temp_local = temp_local; |
466 |
ts->name = NULL;
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ts++; |
468 |
ts->base_type = TCG_TYPE_I32; |
469 |
ts->type = TCG_TYPE_I32; |
470 |
ts->temp_allocated = 1;
|
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ts->temp_local = temp_local; |
472 |
ts->name = NULL;
|
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s->nb_temps += 2;
|
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} else
|
475 |
#endif
|
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{ |
477 |
tcg_temp_alloc(s, s->nb_temps + 1);
|
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ts = &s->temps[s->nb_temps]; |
479 |
ts->base_type = type; |
480 |
ts->type = type; |
481 |
ts->temp_allocated = 1;
|
482 |
ts->temp_local = temp_local; |
483 |
ts->name = NULL;
|
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s->nb_temps++; |
485 |
} |
486 |
} |
487 |
|
488 |
#if defined(CONFIG_DEBUG_TCG)
|
489 |
s->temps_in_use++; |
490 |
#endif
|
491 |
return idx;
|
492 |
} |
493 |
|
494 |
TCGv_i32 tcg_temp_new_internal_i32(int temp_local)
|
495 |
{ |
496 |
int idx;
|
497 |
|
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idx = tcg_temp_new_internal(TCG_TYPE_I32, temp_local); |
499 |
return MAKE_TCGV_I32(idx);
|
500 |
} |
501 |
|
502 |
TCGv_i64 tcg_temp_new_internal_i64(int temp_local)
|
503 |
{ |
504 |
int idx;
|
505 |
|
506 |
idx = tcg_temp_new_internal(TCG_TYPE_I64, temp_local); |
507 |
return MAKE_TCGV_I64(idx);
|
508 |
} |
509 |
|
510 |
static inline void tcg_temp_free_internal(int idx) |
511 |
{ |
512 |
TCGContext *s = &tcg_ctx; |
513 |
TCGTemp *ts; |
514 |
int k;
|
515 |
|
516 |
#if defined(CONFIG_DEBUG_TCG)
|
517 |
s->temps_in_use--; |
518 |
if (s->temps_in_use < 0) { |
519 |
fprintf(stderr, "More temporaries freed than allocated!\n");
|
520 |
} |
521 |
#endif
|
522 |
|
523 |
assert(idx >= s->nb_globals && idx < s->nb_temps); |
524 |
ts = &s->temps[idx]; |
525 |
assert(ts->temp_allocated != 0);
|
526 |
ts->temp_allocated = 0;
|
527 |
k = ts->base_type; |
528 |
if (ts->temp_local)
|
529 |
k += TCG_TYPE_COUNT; |
530 |
ts->next_free_temp = s->first_free_temp[k]; |
531 |
s->first_free_temp[k] = idx; |
532 |
} |
533 |
|
534 |
void tcg_temp_free_i32(TCGv_i32 arg)
|
535 |
{ |
536 |
tcg_temp_free_internal(GET_TCGV_I32(arg)); |
537 |
} |
538 |
|
539 |
void tcg_temp_free_i64(TCGv_i64 arg)
|
540 |
{ |
541 |
tcg_temp_free_internal(GET_TCGV_I64(arg)); |
542 |
} |
543 |
|
544 |
TCGv_i32 tcg_const_i32(int32_t val) |
545 |
{ |
546 |
TCGv_i32 t0; |
547 |
t0 = tcg_temp_new_i32(); |
548 |
tcg_gen_movi_i32(t0, val); |
549 |
return t0;
|
550 |
} |
551 |
|
552 |
TCGv_i64 tcg_const_i64(int64_t val) |
553 |
{ |
554 |
TCGv_i64 t0; |
555 |
t0 = tcg_temp_new_i64(); |
556 |
tcg_gen_movi_i64(t0, val); |
557 |
return t0;
|
558 |
} |
559 |
|
560 |
TCGv_i32 tcg_const_local_i32(int32_t val) |
561 |
{ |
562 |
TCGv_i32 t0; |
563 |
t0 = tcg_temp_local_new_i32(); |
564 |
tcg_gen_movi_i32(t0, val); |
565 |
return t0;
|
566 |
} |
567 |
|
568 |
TCGv_i64 tcg_const_local_i64(int64_t val) |
569 |
{ |
570 |
TCGv_i64 t0; |
571 |
t0 = tcg_temp_local_new_i64(); |
572 |
tcg_gen_movi_i64(t0, val); |
573 |
return t0;
|
574 |
} |
575 |
|
576 |
#if defined(CONFIG_DEBUG_TCG)
|
577 |
void tcg_clear_temp_count(void) |
578 |
{ |
579 |
TCGContext *s = &tcg_ctx; |
580 |
s->temps_in_use = 0;
|
581 |
} |
582 |
|
583 |
int tcg_check_temp_count(void) |
584 |
{ |
585 |
TCGContext *s = &tcg_ctx; |
586 |
if (s->temps_in_use) {
|
587 |
/* Clear the count so that we don't give another
|
588 |
* warning immediately next time around.
|
589 |
*/
|
590 |
s->temps_in_use = 0;
|
591 |
return 1; |
592 |
} |
593 |
return 0; |
594 |
} |
595 |
#endif
|
596 |
|
597 |
void tcg_register_helper(void *func, const char *name) |
598 |
{ |
599 |
TCGContext *s = &tcg_ctx; |
600 |
int n;
|
601 |
if ((s->nb_helpers + 1) > s->allocated_helpers) { |
602 |
n = s->allocated_helpers; |
603 |
if (n == 0) { |
604 |
n = 4;
|
605 |
} else {
|
606 |
n *= 2;
|
607 |
} |
608 |
s->helpers = realloc(s->helpers, n * sizeof(TCGHelperInfo));
|
609 |
s->allocated_helpers = n; |
610 |
} |
611 |
s->helpers[s->nb_helpers].func = (tcg_target_ulong)func; |
612 |
s->helpers[s->nb_helpers].name = name; |
613 |
s->nb_helpers++; |
614 |
} |
615 |
|
616 |
/* Note: we convert the 64 bit args to 32 bit and do some alignment
|
617 |
and endian swap. Maybe it would be better to do the alignment
|
618 |
and endian swap in tcg_reg_alloc_call(). */
|
619 |
void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags, |
620 |
int sizemask, TCGArg ret, int nargs, TCGArg *args) |
621 |
{ |
622 |
int i;
|
623 |
int real_args;
|
624 |
int nb_rets;
|
625 |
TCGArg *nparam; |
626 |
|
627 |
#if defined(TCG_TARGET_EXTEND_ARGS) && TCG_TARGET_REG_BITS == 64 |
628 |
for (i = 0; i < nargs; ++i) { |
629 |
int is_64bit = sizemask & (1 << (i+1)*2); |
630 |
int is_signed = sizemask & (2 << (i+1)*2); |
631 |
if (!is_64bit) {
|
632 |
TCGv_i64 temp = tcg_temp_new_i64(); |
633 |
TCGv_i64 orig = MAKE_TCGV_I64(args[i]); |
634 |
if (is_signed) {
|
635 |
tcg_gen_ext32s_i64(temp, orig); |
636 |
} else {
|
637 |
tcg_gen_ext32u_i64(temp, orig); |
638 |
} |
639 |
args[i] = GET_TCGV_I64(temp); |
640 |
} |
641 |
} |
642 |
#endif /* TCG_TARGET_EXTEND_ARGS */ |
643 |
|
644 |
*s->gen_opc_ptr++ = INDEX_op_call; |
645 |
nparam = s->gen_opparam_ptr++; |
646 |
if (ret != TCG_CALL_DUMMY_ARG) {
|
647 |
#if TCG_TARGET_REG_BITS < 64 |
648 |
if (sizemask & 1) { |
649 |
#ifdef TCG_TARGET_WORDS_BIGENDIAN
|
650 |
*s->gen_opparam_ptr++ = ret + 1;
|
651 |
*s->gen_opparam_ptr++ = ret; |
652 |
#else
|
653 |
*s->gen_opparam_ptr++ = ret; |
654 |
*s->gen_opparam_ptr++ = ret + 1;
|
655 |
#endif
|
656 |
nb_rets = 2;
|
657 |
} else
|
658 |
#endif
|
659 |
{ |
660 |
*s->gen_opparam_ptr++ = ret; |
661 |
nb_rets = 1;
|
662 |
} |
663 |
} else {
|
664 |
nb_rets = 0;
|
665 |
} |
666 |
real_args = 0;
|
667 |
for (i = 0; i < nargs; i++) { |
668 |
#if TCG_TARGET_REG_BITS < 64 |
669 |
int is_64bit = sizemask & (1 << (i+1)*2); |
670 |
if (is_64bit) {
|
671 |
#ifdef TCG_TARGET_CALL_ALIGN_ARGS
|
672 |
/* some targets want aligned 64 bit args */
|
673 |
if (real_args & 1) { |
674 |
*s->gen_opparam_ptr++ = TCG_CALL_DUMMY_ARG; |
675 |
real_args++; |
676 |
} |
677 |
#endif
|
678 |
/* If stack grows up, then we will be placing successive
|
679 |
arguments at lower addresses, which means we need to
|
680 |
reverse the order compared to how we would normally
|
681 |
treat either big or little-endian. For those arguments
|
682 |
that will wind up in registers, this still works for
|
683 |
HPPA (the only current STACK_GROWSUP target) since the
|
684 |
argument registers are *also* allocated in decreasing
|
685 |
order. If another such target is added, this logic may
|
686 |
have to get more complicated to differentiate between
|
687 |
stack arguments and register arguments. */
|
688 |
#if defined(TCG_TARGET_WORDS_BIGENDIAN) != defined(TCG_TARGET_STACK_GROWSUP)
|
689 |
*s->gen_opparam_ptr++ = args[i] + 1;
|
690 |
*s->gen_opparam_ptr++ = args[i]; |
691 |
#else
|
692 |
*s->gen_opparam_ptr++ = args[i]; |
693 |
*s->gen_opparam_ptr++ = args[i] + 1;
|
694 |
#endif
|
695 |
real_args += 2;
|
696 |
continue;
|
697 |
} |
698 |
#endif /* TCG_TARGET_REG_BITS < 64 */ |
699 |
|
700 |
*s->gen_opparam_ptr++ = args[i]; |
701 |
real_args++; |
702 |
} |
703 |
*s->gen_opparam_ptr++ = GET_TCGV_PTR(func); |
704 |
|
705 |
*s->gen_opparam_ptr++ = flags; |
706 |
|
707 |
*nparam = (nb_rets << 16) | (real_args + 1); |
708 |
|
709 |
/* total parameters, needed to go backward in the instruction stream */
|
710 |
*s->gen_opparam_ptr++ = 1 + nb_rets + real_args + 3; |
711 |
|
712 |
#if defined(TCG_TARGET_EXTEND_ARGS) && TCG_TARGET_REG_BITS == 64 |
713 |
for (i = 0; i < nargs; ++i) { |
714 |
int is_64bit = sizemask & (1 << (i+1)*2); |
715 |
if (!is_64bit) {
|
716 |
TCGv_i64 temp = MAKE_TCGV_I64(args[i]); |
717 |
tcg_temp_free_i64(temp); |
718 |
} |
719 |
} |
720 |
#endif /* TCG_TARGET_EXTEND_ARGS */ |
721 |
} |
722 |
|
723 |
#if TCG_TARGET_REG_BITS == 32 |
724 |
void tcg_gen_shifti_i64(TCGv_i64 ret, TCGv_i64 arg1,
|
725 |
int c, int right, int arith) |
726 |
{ |
727 |
if (c == 0) { |
728 |
tcg_gen_mov_i32(TCGV_LOW(ret), TCGV_LOW(arg1)); |
729 |
tcg_gen_mov_i32(TCGV_HIGH(ret), TCGV_HIGH(arg1)); |
730 |
} else if (c >= 32) { |
731 |
c -= 32;
|
732 |
if (right) {
|
733 |
if (arith) {
|
734 |
tcg_gen_sari_i32(TCGV_LOW(ret), TCGV_HIGH(arg1), c); |
735 |
tcg_gen_sari_i32(TCGV_HIGH(ret), TCGV_HIGH(arg1), 31);
|
736 |
} else {
|
737 |
tcg_gen_shri_i32(TCGV_LOW(ret), TCGV_HIGH(arg1), c); |
738 |
tcg_gen_movi_i32(TCGV_HIGH(ret), 0);
|
739 |
} |
740 |
} else {
|
741 |
tcg_gen_shli_i32(TCGV_HIGH(ret), TCGV_LOW(arg1), c); |
742 |
tcg_gen_movi_i32(TCGV_LOW(ret), 0);
|
743 |
} |
744 |
} else {
|
745 |
TCGv_i32 t0, t1; |
746 |
|
747 |
t0 = tcg_temp_new_i32(); |
748 |
t1 = tcg_temp_new_i32(); |
749 |
if (right) {
|
750 |
tcg_gen_shli_i32(t0, TCGV_HIGH(arg1), 32 - c);
|
751 |
if (arith)
|
752 |
tcg_gen_sari_i32(t1, TCGV_HIGH(arg1), c); |
753 |
else
|
754 |
tcg_gen_shri_i32(t1, TCGV_HIGH(arg1), c); |
755 |
tcg_gen_shri_i32(TCGV_LOW(ret), TCGV_LOW(arg1), c); |
756 |
tcg_gen_or_i32(TCGV_LOW(ret), TCGV_LOW(ret), t0); |
757 |
tcg_gen_mov_i32(TCGV_HIGH(ret), t1); |
758 |
} else {
|
759 |
tcg_gen_shri_i32(t0, TCGV_LOW(arg1), 32 - c);
|
760 |
/* Note: ret can be the same as arg1, so we use t1 */
|
761 |
tcg_gen_shli_i32(t1, TCGV_LOW(arg1), c); |
762 |
tcg_gen_shli_i32(TCGV_HIGH(ret), TCGV_HIGH(arg1), c); |
763 |
tcg_gen_or_i32(TCGV_HIGH(ret), TCGV_HIGH(ret), t0); |
764 |
tcg_gen_mov_i32(TCGV_LOW(ret), t1); |
765 |
} |
766 |
tcg_temp_free_i32(t0); |
767 |
tcg_temp_free_i32(t1); |
768 |
} |
769 |
} |
770 |
#endif
|
771 |
|
772 |
|
773 |
static void tcg_reg_alloc_start(TCGContext *s) |
774 |
{ |
775 |
int i;
|
776 |
TCGTemp *ts; |
777 |
for(i = 0; i < s->nb_globals; i++) { |
778 |
ts = &s->temps[i]; |
779 |
if (ts->fixed_reg) {
|
780 |
ts->val_type = TEMP_VAL_REG; |
781 |
} else {
|
782 |
ts->val_type = TEMP_VAL_MEM; |
783 |
} |
784 |
} |
785 |
for(i = s->nb_globals; i < s->nb_temps; i++) {
|
786 |
ts = &s->temps[i]; |
787 |
if (ts->temp_local) {
|
788 |
ts->val_type = TEMP_VAL_MEM; |
789 |
} else {
|
790 |
ts->val_type = TEMP_VAL_DEAD; |
791 |
} |
792 |
ts->mem_allocated = 0;
|
793 |
ts->fixed_reg = 0;
|
794 |
} |
795 |
for(i = 0; i < TCG_TARGET_NB_REGS; i++) { |
796 |
s->reg_to_temp[i] = -1;
|
797 |
} |
798 |
} |
799 |
|
800 |
static char *tcg_get_arg_str_idx(TCGContext *s, char *buf, int buf_size, |
801 |
int idx)
|
802 |
{ |
803 |
TCGTemp *ts; |
804 |
|
805 |
assert(idx >= 0 && idx < s->nb_temps);
|
806 |
ts = &s->temps[idx]; |
807 |
assert(ts); |
808 |
if (idx < s->nb_globals) {
|
809 |
pstrcpy(buf, buf_size, ts->name); |
810 |
} else {
|
811 |
if (ts->temp_local)
|
812 |
snprintf(buf, buf_size, "loc%d", idx - s->nb_globals);
|
813 |
else
|
814 |
snprintf(buf, buf_size, "tmp%d", idx - s->nb_globals);
|
815 |
} |
816 |
return buf;
|
817 |
} |
818 |
|
819 |
char *tcg_get_arg_str_i32(TCGContext *s, char *buf, int buf_size, TCGv_i32 arg) |
820 |
{ |
821 |
return tcg_get_arg_str_idx(s, buf, buf_size, GET_TCGV_I32(arg));
|
822 |
} |
823 |
|
824 |
char *tcg_get_arg_str_i64(TCGContext *s, char *buf, int buf_size, TCGv_i64 arg) |
825 |
{ |
826 |
return tcg_get_arg_str_idx(s, buf, buf_size, GET_TCGV_I64(arg));
|
827 |
} |
828 |
|
829 |
static int helper_cmp(const void *p1, const void *p2) |
830 |
{ |
831 |
const TCGHelperInfo *th1 = p1;
|
832 |
const TCGHelperInfo *th2 = p2;
|
833 |
if (th1->func < th2->func)
|
834 |
return -1; |
835 |
else if (th1->func == th2->func) |
836 |
return 0; |
837 |
else
|
838 |
return 1; |
839 |
} |
840 |
|
841 |
/* find helper definition (Note: A hash table would be better) */
|
842 |
static TCGHelperInfo *tcg_find_helper(TCGContext *s, tcg_target_ulong val)
|
843 |
{ |
844 |
int m, m_min, m_max;
|
845 |
TCGHelperInfo *th; |
846 |
tcg_target_ulong v; |
847 |
|
848 |
if (unlikely(!s->helpers_sorted)) {
|
849 |
qsort(s->helpers, s->nb_helpers, sizeof(TCGHelperInfo),
|
850 |
helper_cmp); |
851 |
s->helpers_sorted = 1;
|
852 |
} |
853 |
|
854 |
/* binary search */
|
855 |
m_min = 0;
|
856 |
m_max = s->nb_helpers - 1;
|
857 |
while (m_min <= m_max) {
|
858 |
m = (m_min + m_max) >> 1;
|
859 |
th = &s->helpers[m]; |
860 |
v = th->func; |
861 |
if (v == val)
|
862 |
return th;
|
863 |
else if (val < v) { |
864 |
m_max = m - 1;
|
865 |
} else {
|
866 |
m_min = m + 1;
|
867 |
} |
868 |
} |
869 |
return NULL; |
870 |
} |
871 |
|
872 |
static const char * const cond_name[] = |
873 |
{ |
874 |
[TCG_COND_NEVER] = "never",
|
875 |
[TCG_COND_ALWAYS] = "always",
|
876 |
[TCG_COND_EQ] = "eq",
|
877 |
[TCG_COND_NE] = "ne",
|
878 |
[TCG_COND_LT] = "lt",
|
879 |
[TCG_COND_GE] = "ge",
|
880 |
[TCG_COND_LE] = "le",
|
881 |
[TCG_COND_GT] = "gt",
|
882 |
[TCG_COND_LTU] = "ltu",
|
883 |
[TCG_COND_GEU] = "geu",
|
884 |
[TCG_COND_LEU] = "leu",
|
885 |
[TCG_COND_GTU] = "gtu"
|
886 |
}; |
887 |
|
888 |
void tcg_dump_ops(TCGContext *s)
|
889 |
{ |
890 |
const uint16_t *opc_ptr;
|
891 |
const TCGArg *args;
|
892 |
TCGArg arg; |
893 |
TCGOpcode c; |
894 |
int i, k, nb_oargs, nb_iargs, nb_cargs, first_insn;
|
895 |
const TCGOpDef *def;
|
896 |
char buf[128]; |
897 |
|
898 |
first_insn = 1;
|
899 |
opc_ptr = s->gen_opc_buf; |
900 |
args = s->gen_opparam_buf; |
901 |
while (opc_ptr < s->gen_opc_ptr) {
|
902 |
c = *opc_ptr++; |
903 |
def = &tcg_op_defs[c]; |
904 |
if (c == INDEX_op_debug_insn_start) {
|
905 |
uint64_t pc; |
906 |
#if TARGET_LONG_BITS > TCG_TARGET_REG_BITS
|
907 |
pc = ((uint64_t)args[1] << 32) | args[0]; |
908 |
#else
|
909 |
pc = args[0];
|
910 |
#endif
|
911 |
if (!first_insn) {
|
912 |
qemu_log("\n");
|
913 |
} |
914 |
qemu_log(" ---- 0x%" PRIx64, pc);
|
915 |
first_insn = 0;
|
916 |
nb_oargs = def->nb_oargs; |
917 |
nb_iargs = def->nb_iargs; |
918 |
nb_cargs = def->nb_cargs; |
919 |
} else if (c == INDEX_op_call) { |
920 |
TCGArg arg; |
921 |
|
922 |
/* variable number of arguments */
|
923 |
arg = *args++; |
924 |
nb_oargs = arg >> 16;
|
925 |
nb_iargs = arg & 0xffff;
|
926 |
nb_cargs = def->nb_cargs; |
927 |
|
928 |
qemu_log(" %s ", def->name);
|
929 |
|
930 |
/* function name */
|
931 |
qemu_log("%s",
|
932 |
tcg_get_arg_str_idx(s, buf, sizeof(buf),
|
933 |
args[nb_oargs + nb_iargs - 1]));
|
934 |
/* flags */
|
935 |
qemu_log(",$0x%" TCG_PRIlx, args[nb_oargs + nb_iargs]);
|
936 |
/* nb out args */
|
937 |
qemu_log(",$%d", nb_oargs);
|
938 |
for(i = 0; i < nb_oargs; i++) { |
939 |
qemu_log(",");
|
940 |
qemu_log("%s", tcg_get_arg_str_idx(s, buf, sizeof(buf), |
941 |
args[i])); |
942 |
} |
943 |
for(i = 0; i < (nb_iargs - 1); i++) { |
944 |
qemu_log(",");
|
945 |
if (args[nb_oargs + i] == TCG_CALL_DUMMY_ARG) {
|
946 |
qemu_log("<dummy>");
|
947 |
} else {
|
948 |
qemu_log("%s", tcg_get_arg_str_idx(s, buf, sizeof(buf), |
949 |
args[nb_oargs + i])); |
950 |
} |
951 |
} |
952 |
} else if (c == INDEX_op_movi_i32 || c == INDEX_op_movi_i64) { |
953 |
tcg_target_ulong val; |
954 |
TCGHelperInfo *th; |
955 |
|
956 |
nb_oargs = def->nb_oargs; |
957 |
nb_iargs = def->nb_iargs; |
958 |
nb_cargs = def->nb_cargs; |
959 |
qemu_log(" %s %s,$", def->name,
|
960 |
tcg_get_arg_str_idx(s, buf, sizeof(buf), args[0])); |
961 |
val = args[1];
|
962 |
th = tcg_find_helper(s, val); |
963 |
if (th) {
|
964 |
qemu_log("%s", th->name);
|
965 |
} else {
|
966 |
if (c == INDEX_op_movi_i32) {
|
967 |
qemu_log("0x%x", (uint32_t)val);
|
968 |
} else {
|
969 |
qemu_log("0x%" PRIx64 , (uint64_t)val);
|
970 |
} |
971 |
} |
972 |
} else {
|
973 |
qemu_log(" %s ", def->name);
|
974 |
if (c == INDEX_op_nopn) {
|
975 |
/* variable number of arguments */
|
976 |
nb_cargs = *args; |
977 |
nb_oargs = 0;
|
978 |
nb_iargs = 0;
|
979 |
} else {
|
980 |
nb_oargs = def->nb_oargs; |
981 |
nb_iargs = def->nb_iargs; |
982 |
nb_cargs = def->nb_cargs; |
983 |
} |
984 |
|
985 |
k = 0;
|
986 |
for(i = 0; i < nb_oargs; i++) { |
987 |
if (k != 0) { |
988 |
qemu_log(",");
|
989 |
} |
990 |
qemu_log("%s", tcg_get_arg_str_idx(s, buf, sizeof(buf), |
991 |
args[k++])); |
992 |
} |
993 |
for(i = 0; i < nb_iargs; i++) { |
994 |
if (k != 0) { |
995 |
qemu_log(",");
|
996 |
} |
997 |
qemu_log("%s", tcg_get_arg_str_idx(s, buf, sizeof(buf), |
998 |
args[k++])); |
999 |
} |
1000 |
switch (c) {
|
1001 |
case INDEX_op_brcond_i32:
|
1002 |
case INDEX_op_setcond_i32:
|
1003 |
case INDEX_op_movcond_i32:
|
1004 |
case INDEX_op_brcond2_i32:
|
1005 |
case INDEX_op_setcond2_i32:
|
1006 |
case INDEX_op_brcond_i64:
|
1007 |
case INDEX_op_setcond_i64:
|
1008 |
case INDEX_op_movcond_i64:
|
1009 |
if (args[k] < ARRAY_SIZE(cond_name) && cond_name[args[k]]) {
|
1010 |
qemu_log(",%s", cond_name[args[k++]]);
|
1011 |
} else {
|
1012 |
qemu_log(",$0x%" TCG_PRIlx, args[k++]);
|
1013 |
} |
1014 |
i = 1;
|
1015 |
break;
|
1016 |
default:
|
1017 |
i = 0;
|
1018 |
break;
|
1019 |
} |
1020 |
for(; i < nb_cargs; i++) {
|
1021 |
if (k != 0) { |
1022 |
qemu_log(",");
|
1023 |
} |
1024 |
arg = args[k++]; |
1025 |
qemu_log("$0x%" TCG_PRIlx, arg);
|
1026 |
} |
1027 |
} |
1028 |
qemu_log("\n");
|
1029 |
args += nb_iargs + nb_oargs + nb_cargs; |
1030 |
} |
1031 |
} |
1032 |
|
1033 |
/* we give more priority to constraints with less registers */
|
1034 |
static int get_constraint_priority(const TCGOpDef *def, int k) |
1035 |
{ |
1036 |
const TCGArgConstraint *arg_ct;
|
1037 |
|
1038 |
int i, n;
|
1039 |
arg_ct = &def->args_ct[k]; |
1040 |
if (arg_ct->ct & TCG_CT_ALIAS) {
|
1041 |
/* an alias is equivalent to a single register */
|
1042 |
n = 1;
|
1043 |
} else {
|
1044 |
if (!(arg_ct->ct & TCG_CT_REG))
|
1045 |
return 0; |
1046 |
n = 0;
|
1047 |
for(i = 0; i < TCG_TARGET_NB_REGS; i++) { |
1048 |
if (tcg_regset_test_reg(arg_ct->u.regs, i))
|
1049 |
n++; |
1050 |
} |
1051 |
} |
1052 |
return TCG_TARGET_NB_REGS - n + 1; |
1053 |
} |
1054 |
|
1055 |
/* sort from highest priority to lowest */
|
1056 |
static void sort_constraints(TCGOpDef *def, int start, int n) |
1057 |
{ |
1058 |
int i, j, p1, p2, tmp;
|
1059 |
|
1060 |
for(i = 0; i < n; i++) |
1061 |
def->sorted_args[start + i] = start + i; |
1062 |
if (n <= 1) |
1063 |
return;
|
1064 |
for(i = 0; i < n - 1; i++) { |
1065 |
for(j = i + 1; j < n; j++) { |
1066 |
p1 = get_constraint_priority(def, def->sorted_args[start + i]); |
1067 |
p2 = get_constraint_priority(def, def->sorted_args[start + j]); |
1068 |
if (p1 < p2) {
|
1069 |
tmp = def->sorted_args[start + i]; |
1070 |
def->sorted_args[start + i] = def->sorted_args[start + j]; |
1071 |
def->sorted_args[start + j] = tmp; |
1072 |
} |
1073 |
} |
1074 |
} |
1075 |
} |
1076 |
|
1077 |
void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs) |
1078 |
{ |
1079 |
TCGOpcode op; |
1080 |
TCGOpDef *def; |
1081 |
const char *ct_str; |
1082 |
int i, nb_args;
|
1083 |
|
1084 |
for(;;) {
|
1085 |
if (tdefs->op == (TCGOpcode)-1) |
1086 |
break;
|
1087 |
op = tdefs->op; |
1088 |
assert((unsigned)op < NB_OPS);
|
1089 |
def = &tcg_op_defs[op]; |
1090 |
#if defined(CONFIG_DEBUG_TCG)
|
1091 |
/* Duplicate entry in op definitions? */
|
1092 |
assert(!def->used); |
1093 |
def->used = 1;
|
1094 |
#endif
|
1095 |
nb_args = def->nb_iargs + def->nb_oargs; |
1096 |
for(i = 0; i < nb_args; i++) { |
1097 |
ct_str = tdefs->args_ct_str[i]; |
1098 |
/* Incomplete TCGTargetOpDef entry? */
|
1099 |
assert(ct_str != NULL);
|
1100 |
tcg_regset_clear(def->args_ct[i].u.regs); |
1101 |
def->args_ct[i].ct = 0;
|
1102 |
if (ct_str[0] >= '0' && ct_str[0] <= '9') { |
1103 |
int oarg;
|
1104 |
oarg = ct_str[0] - '0'; |
1105 |
assert(oarg < def->nb_oargs); |
1106 |
assert(def->args_ct[oarg].ct & TCG_CT_REG); |
1107 |
/* TCG_CT_ALIAS is for the output arguments. The input
|
1108 |
argument is tagged with TCG_CT_IALIAS. */
|
1109 |
def->args_ct[i] = def->args_ct[oarg]; |
1110 |
def->args_ct[oarg].ct = TCG_CT_ALIAS; |
1111 |
def->args_ct[oarg].alias_index = i; |
1112 |
def->args_ct[i].ct |= TCG_CT_IALIAS; |
1113 |
def->args_ct[i].alias_index = oarg; |
1114 |
} else {
|
1115 |
for(;;) {
|
1116 |
if (*ct_str == '\0') |
1117 |
break;
|
1118 |
switch(*ct_str) {
|
1119 |
case 'i': |
1120 |
def->args_ct[i].ct |= TCG_CT_CONST; |
1121 |
ct_str++; |
1122 |
break;
|
1123 |
default:
|
1124 |
if (target_parse_constraint(&def->args_ct[i], &ct_str) < 0) { |
1125 |
fprintf(stderr, "Invalid constraint '%s' for arg %d of operation '%s'\n",
|
1126 |
ct_str, i, def->name); |
1127 |
exit(1);
|
1128 |
} |
1129 |
} |
1130 |
} |
1131 |
} |
1132 |
} |
1133 |
|
1134 |
/* TCGTargetOpDef entry with too much information? */
|
1135 |
assert(i == TCG_MAX_OP_ARGS || tdefs->args_ct_str[i] == NULL);
|
1136 |
|
1137 |
/* sort the constraints (XXX: this is just an heuristic) */
|
1138 |
sort_constraints(def, 0, def->nb_oargs);
|
1139 |
sort_constraints(def, def->nb_oargs, def->nb_iargs); |
1140 |
|
1141 |
#if 0
|
1142 |
{
|
1143 |
int i;
|
1144 |
|
1145 |
printf("%s: sorted=", def->name);
|
1146 |
for(i = 0; i < def->nb_oargs + def->nb_iargs; i++)
|
1147 |
printf(" %d", def->sorted_args[i]);
|
1148 |
printf("\n");
|
1149 |
}
|
1150 |
#endif
|
1151 |
tdefs++; |
1152 |
} |
1153 |
|
1154 |
#if defined(CONFIG_DEBUG_TCG)
|
1155 |
i = 0;
|
1156 |
for (op = 0; op < ARRAY_SIZE(tcg_op_defs); op++) { |
1157 |
const TCGOpDef *def = &tcg_op_defs[op];
|
1158 |
if (op < INDEX_op_call
|
1159 |
|| op == INDEX_op_debug_insn_start |
1160 |
|| (def->flags & TCG_OPF_NOT_PRESENT)) { |
1161 |
/* Wrong entry in op definitions? */
|
1162 |
if (def->used) {
|
1163 |
fprintf(stderr, "Invalid op definition for %s\n", def->name);
|
1164 |
i = 1;
|
1165 |
} |
1166 |
} else {
|
1167 |
/* Missing entry in op definitions? */
|
1168 |
if (!def->used) {
|
1169 |
fprintf(stderr, "Missing op definition for %s\n", def->name);
|
1170 |
i = 1;
|
1171 |
} |
1172 |
} |
1173 |
} |
1174 |
if (i == 1) { |
1175 |
tcg_abort(); |
1176 |
} |
1177 |
#endif
|
1178 |
} |
1179 |
|
1180 |
#ifdef USE_LIVENESS_ANALYSIS
|
1181 |
|
1182 |
/* set a nop for an operation using 'nb_args' */
|
1183 |
static inline void tcg_set_nop(TCGContext *s, uint16_t *opc_ptr, |
1184 |
TCGArg *args, int nb_args)
|
1185 |
{ |
1186 |
if (nb_args == 0) { |
1187 |
*opc_ptr = INDEX_op_nop; |
1188 |
} else {
|
1189 |
*opc_ptr = INDEX_op_nopn; |
1190 |
args[0] = nb_args;
|
1191 |
args[nb_args - 1] = nb_args;
|
1192 |
} |
1193 |
} |
1194 |
|
1195 |
/* liveness analysis: end of function: all temps are dead, and globals
|
1196 |
should be in memory. */
|
1197 |
static inline void tcg_la_func_end(TCGContext *s, uint8_t *dead_temps, |
1198 |
uint8_t *mem_temps) |
1199 |
{ |
1200 |
memset(dead_temps, 1, s->nb_temps);
|
1201 |
memset(mem_temps, 1, s->nb_globals);
|
1202 |
memset(mem_temps + s->nb_globals, 0, s->nb_temps - s->nb_globals);
|
1203 |
} |
1204 |
|
1205 |
/* liveness analysis: end of basic block: all temps are dead, globals
|
1206 |
and local temps should be in memory. */
|
1207 |
static inline void tcg_la_bb_end(TCGContext *s, uint8_t *dead_temps, |
1208 |
uint8_t *mem_temps) |
1209 |
{ |
1210 |
int i;
|
1211 |
|
1212 |
memset(dead_temps, 1, s->nb_temps);
|
1213 |
memset(mem_temps, 1, s->nb_globals);
|
1214 |
for(i = s->nb_globals; i < s->nb_temps; i++) {
|
1215 |
mem_temps[i] = s->temps[i].temp_local; |
1216 |
} |
1217 |
} |
1218 |
|
1219 |
/* Liveness analysis : update the opc_dead_args array to tell if a
|
1220 |
given input arguments is dead. Instructions updating dead
|
1221 |
temporaries are removed. */
|
1222 |
static void tcg_liveness_analysis(TCGContext *s) |
1223 |
{ |
1224 |
int i, op_index, nb_args, nb_iargs, nb_oargs, arg, nb_ops;
|
1225 |
TCGOpcode op; |
1226 |
TCGArg *args; |
1227 |
const TCGOpDef *def;
|
1228 |
uint8_t *dead_temps, *mem_temps; |
1229 |
uint16_t dead_args; |
1230 |
uint8_t sync_args; |
1231 |
|
1232 |
s->gen_opc_ptr++; /* skip end */
|
1233 |
|
1234 |
nb_ops = s->gen_opc_ptr - s->gen_opc_buf; |
1235 |
|
1236 |
s->op_dead_args = tcg_malloc(nb_ops * sizeof(uint16_t));
|
1237 |
s->op_sync_args = tcg_malloc(nb_ops * sizeof(uint8_t));
|
1238 |
|
1239 |
dead_temps = tcg_malloc(s->nb_temps); |
1240 |
mem_temps = tcg_malloc(s->nb_temps); |
1241 |
tcg_la_func_end(s, dead_temps, mem_temps); |
1242 |
|
1243 |
args = s->gen_opparam_ptr; |
1244 |
op_index = nb_ops - 1;
|
1245 |
while (op_index >= 0) { |
1246 |
op = s->gen_opc_buf[op_index]; |
1247 |
def = &tcg_op_defs[op]; |
1248 |
switch(op) {
|
1249 |
case INDEX_op_call:
|
1250 |
{ |
1251 |
int call_flags;
|
1252 |
|
1253 |
nb_args = args[-1];
|
1254 |
args -= nb_args; |
1255 |
nb_iargs = args[0] & 0xffff; |
1256 |
nb_oargs = args[0] >> 16; |
1257 |
args++; |
1258 |
call_flags = args[nb_oargs + nb_iargs]; |
1259 |
|
1260 |
/* pure functions can be removed if their result is not
|
1261 |
used */
|
1262 |
if (call_flags & TCG_CALL_NO_SIDE_EFFECTS) {
|
1263 |
for(i = 0; i < nb_oargs; i++) { |
1264 |
arg = args[i]; |
1265 |
if (!dead_temps[arg] || mem_temps[arg]) {
|
1266 |
goto do_not_remove_call;
|
1267 |
} |
1268 |
} |
1269 |
tcg_set_nop(s, s->gen_opc_buf + op_index, |
1270 |
args - 1, nb_args);
|
1271 |
} else {
|
1272 |
do_not_remove_call:
|
1273 |
|
1274 |
/* output args are dead */
|
1275 |
dead_args = 0;
|
1276 |
sync_args = 0;
|
1277 |
for(i = 0; i < nb_oargs; i++) { |
1278 |
arg = args[i]; |
1279 |
if (dead_temps[arg]) {
|
1280 |
dead_args |= (1 << i);
|
1281 |
} |
1282 |
if (mem_temps[arg]) {
|
1283 |
sync_args |= (1 << i);
|
1284 |
} |
1285 |
dead_temps[arg] = 1;
|
1286 |
mem_temps[arg] = 0;
|
1287 |
} |
1288 |
|
1289 |
if (!(call_flags & TCG_CALL_NO_READ_GLOBALS)) {
|
1290 |
/* globals should be synced to memory */
|
1291 |
memset(mem_temps, 1, s->nb_globals);
|
1292 |
} |
1293 |
if (!(call_flags & (TCG_CALL_NO_WRITE_GLOBALS |
|
1294 |
TCG_CALL_NO_READ_GLOBALS))) { |
1295 |
/* globals should go back to memory */
|
1296 |
memset(dead_temps, 1, s->nb_globals);
|
1297 |
} |
1298 |
|
1299 |
/* input args are live */
|
1300 |
for(i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
|
1301 |
arg = args[i]; |
1302 |
if (arg != TCG_CALL_DUMMY_ARG) {
|
1303 |
if (dead_temps[arg]) {
|
1304 |
dead_args |= (1 << i);
|
1305 |
} |
1306 |
dead_temps[arg] = 0;
|
1307 |
} |
1308 |
} |
1309 |
s->op_dead_args[op_index] = dead_args; |
1310 |
s->op_sync_args[op_index] = sync_args; |
1311 |
} |
1312 |
args--; |
1313 |
} |
1314 |
break;
|
1315 |
case INDEX_op_debug_insn_start:
|
1316 |
args -= def->nb_args; |
1317 |
break;
|
1318 |
case INDEX_op_nopn:
|
1319 |
nb_args = args[-1];
|
1320 |
args -= nb_args; |
1321 |
break;
|
1322 |
case INDEX_op_discard:
|
1323 |
args--; |
1324 |
/* mark the temporary as dead */
|
1325 |
dead_temps[args[0]] = 1; |
1326 |
mem_temps[args[0]] = 0; |
1327 |
break;
|
1328 |
case INDEX_op_end:
|
1329 |
break;
|
1330 |
|
1331 |
case INDEX_op_add2_i32:
|
1332 |
case INDEX_op_sub2_i32:
|
1333 |
args -= 6;
|
1334 |
nb_iargs = 4;
|
1335 |
nb_oargs = 2;
|
1336 |
/* Test if the high part of the operation is dead, but not
|
1337 |
the low part. The result can be optimized to a simple
|
1338 |
add or sub. This happens often for x86_64 guest when the
|
1339 |
cpu mode is set to 32 bit. */
|
1340 |
if (dead_temps[args[1]] && !mem_temps[args[1]]) { |
1341 |
if (dead_temps[args[0]] && !mem_temps[args[0]]) { |
1342 |
goto do_remove;
|
1343 |
} |
1344 |
/* Create the single operation plus nop. */
|
1345 |
if (op == INDEX_op_add2_i32) {
|
1346 |
op = INDEX_op_add_i32; |
1347 |
} else {
|
1348 |
op = INDEX_op_sub_i32; |
1349 |
} |
1350 |
s->gen_opc_buf[op_index] = op; |
1351 |
args[1] = args[2]; |
1352 |
args[2] = args[4]; |
1353 |
assert(s->gen_opc_buf[op_index + 1] == INDEX_op_nop);
|
1354 |
tcg_set_nop(s, s->gen_opc_buf + op_index + 1, args + 3, 3); |
1355 |
/* Fall through and mark the single-word operation live. */
|
1356 |
nb_iargs = 2;
|
1357 |
nb_oargs = 1;
|
1358 |
} |
1359 |
goto do_not_remove;
|
1360 |
|
1361 |
case INDEX_op_mulu2_i32:
|
1362 |
args -= 4;
|
1363 |
nb_iargs = 2;
|
1364 |
nb_oargs = 2;
|
1365 |
/* Likewise, test for the high part of the operation dead. */
|
1366 |
if (dead_temps[args[1]] && !mem_temps[args[1]]) { |
1367 |
if (dead_temps[args[0]] && !mem_temps[args[0]]) { |
1368 |
goto do_remove;
|
1369 |
} |
1370 |
s->gen_opc_buf[op_index] = op = INDEX_op_mul_i32; |
1371 |
args[1] = args[2]; |
1372 |
args[2] = args[3]; |
1373 |
assert(s->gen_opc_buf[op_index + 1] == INDEX_op_nop);
|
1374 |
tcg_set_nop(s, s->gen_opc_buf + op_index + 1, args + 3, 1); |
1375 |
/* Fall through and mark the single-word operation live. */
|
1376 |
nb_oargs = 1;
|
1377 |
} |
1378 |
goto do_not_remove;
|
1379 |
|
1380 |
default:
|
1381 |
/* XXX: optimize by hardcoding common cases (e.g. triadic ops) */
|
1382 |
args -= def->nb_args; |
1383 |
nb_iargs = def->nb_iargs; |
1384 |
nb_oargs = def->nb_oargs; |
1385 |
|
1386 |
/* Test if the operation can be removed because all
|
1387 |
its outputs are dead. We assume that nb_oargs == 0
|
1388 |
implies side effects */
|
1389 |
if (!(def->flags & TCG_OPF_SIDE_EFFECTS) && nb_oargs != 0) { |
1390 |
for(i = 0; i < nb_oargs; i++) { |
1391 |
arg = args[i]; |
1392 |
if (!dead_temps[arg] || mem_temps[arg]) {
|
1393 |
goto do_not_remove;
|
1394 |
} |
1395 |
} |
1396 |
do_remove:
|
1397 |
tcg_set_nop(s, s->gen_opc_buf + op_index, args, def->nb_args); |
1398 |
#ifdef CONFIG_PROFILER
|
1399 |
s->del_op_count++; |
1400 |
#endif
|
1401 |
} else {
|
1402 |
do_not_remove:
|
1403 |
|
1404 |
/* output args are dead */
|
1405 |
dead_args = 0;
|
1406 |
sync_args = 0;
|
1407 |
for(i = 0; i < nb_oargs; i++) { |
1408 |
arg = args[i]; |
1409 |
if (dead_temps[arg]) {
|
1410 |
dead_args |= (1 << i);
|
1411 |
} |
1412 |
if (mem_temps[arg]) {
|
1413 |
sync_args |= (1 << i);
|
1414 |
} |
1415 |
dead_temps[arg] = 1;
|
1416 |
mem_temps[arg] = 0;
|
1417 |
} |
1418 |
|
1419 |
/* if end of basic block, update */
|
1420 |
if (def->flags & TCG_OPF_BB_END) {
|
1421 |
tcg_la_bb_end(s, dead_temps, mem_temps); |
1422 |
} else if (def->flags & TCG_OPF_SIDE_EFFECTS) { |
1423 |
/* globals should be synced to memory */
|
1424 |
memset(mem_temps, 1, s->nb_globals);
|
1425 |
} |
1426 |
|
1427 |
/* input args are live */
|
1428 |
for(i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
|
1429 |
arg = args[i]; |
1430 |
if (dead_temps[arg]) {
|
1431 |
dead_args |= (1 << i);
|
1432 |
} |
1433 |
dead_temps[arg] = 0;
|
1434 |
} |
1435 |
s->op_dead_args[op_index] = dead_args; |
1436 |
s->op_sync_args[op_index] = sync_args; |
1437 |
} |
1438 |
break;
|
1439 |
} |
1440 |
op_index--; |
1441 |
} |
1442 |
|
1443 |
if (args != s->gen_opparam_buf) {
|
1444 |
tcg_abort(); |
1445 |
} |
1446 |
} |
1447 |
#else
|
1448 |
/* dummy liveness analysis */
|
1449 |
static void tcg_liveness_analysis(TCGContext *s) |
1450 |
{ |
1451 |
int nb_ops;
|
1452 |
nb_ops = s->gen_opc_ptr - s->gen_opc_buf; |
1453 |
|
1454 |
s->op_dead_args = tcg_malloc(nb_ops * sizeof(uint16_t));
|
1455 |
memset(s->op_dead_args, 0, nb_ops * sizeof(uint16_t)); |
1456 |
s->op_sync_args = tcg_malloc(nb_ops * sizeof(uint8_t));
|
1457 |
memset(s->op_sync_args, 0, nb_ops * sizeof(uint8_t)); |
1458 |
} |
1459 |
#endif
|
1460 |
|
1461 |
#ifndef NDEBUG
|
1462 |
static void dump_regs(TCGContext *s) |
1463 |
{ |
1464 |
TCGTemp *ts; |
1465 |
int i;
|
1466 |
char buf[64]; |
1467 |
|
1468 |
for(i = 0; i < s->nb_temps; i++) { |
1469 |
ts = &s->temps[i]; |
1470 |
printf(" %10s: ", tcg_get_arg_str_idx(s, buf, sizeof(buf), i)); |
1471 |
switch(ts->val_type) {
|
1472 |
case TEMP_VAL_REG:
|
1473 |
printf("%s", tcg_target_reg_names[ts->reg]);
|
1474 |
break;
|
1475 |
case TEMP_VAL_MEM:
|
1476 |
printf("%d(%s)", (int)ts->mem_offset, tcg_target_reg_names[ts->mem_reg]); |
1477 |
break;
|
1478 |
case TEMP_VAL_CONST:
|
1479 |
printf("$0x%" TCG_PRIlx, ts->val);
|
1480 |
break;
|
1481 |
case TEMP_VAL_DEAD:
|
1482 |
printf("D");
|
1483 |
break;
|
1484 |
default:
|
1485 |
printf("???");
|
1486 |
break;
|
1487 |
} |
1488 |
printf("\n");
|
1489 |
} |
1490 |
|
1491 |
for(i = 0; i < TCG_TARGET_NB_REGS; i++) { |
1492 |
if (s->reg_to_temp[i] >= 0) { |
1493 |
printf("%s: %s\n",
|
1494 |
tcg_target_reg_names[i], |
1495 |
tcg_get_arg_str_idx(s, buf, sizeof(buf), s->reg_to_temp[i]));
|
1496 |
} |
1497 |
} |
1498 |
} |
1499 |
|
1500 |
static void check_regs(TCGContext *s) |
1501 |
{ |
1502 |
int reg, k;
|
1503 |
TCGTemp *ts; |
1504 |
char buf[64]; |
1505 |
|
1506 |
for(reg = 0; reg < TCG_TARGET_NB_REGS; reg++) { |
1507 |
k = s->reg_to_temp[reg]; |
1508 |
if (k >= 0) { |
1509 |
ts = &s->temps[k]; |
1510 |
if (ts->val_type != TEMP_VAL_REG ||
|
1511 |
ts->reg != reg) { |
1512 |
printf("Inconsistency for register %s:\n",
|
1513 |
tcg_target_reg_names[reg]); |
1514 |
goto fail;
|
1515 |
} |
1516 |
} |
1517 |
} |
1518 |
for(k = 0; k < s->nb_temps; k++) { |
1519 |
ts = &s->temps[k]; |
1520 |
if (ts->val_type == TEMP_VAL_REG &&
|
1521 |
!ts->fixed_reg && |
1522 |
s->reg_to_temp[ts->reg] != k) { |
1523 |
printf("Inconsistency for temp %s:\n",
|
1524 |
tcg_get_arg_str_idx(s, buf, sizeof(buf), k));
|
1525 |
fail:
|
1526 |
printf("reg state:\n");
|
1527 |
dump_regs(s); |
1528 |
tcg_abort(); |
1529 |
} |
1530 |
} |
1531 |
} |
1532 |
#endif
|
1533 |
|
1534 |
static void temp_allocate_frame(TCGContext *s, int temp) |
1535 |
{ |
1536 |
TCGTemp *ts; |
1537 |
ts = &s->temps[temp]; |
1538 |
#if !(defined(__sparc__) && TCG_TARGET_REG_BITS == 64) |
1539 |
/* Sparc64 stack is accessed with offset of 2047 */
|
1540 |
s->current_frame_offset = (s->current_frame_offset + |
1541 |
(tcg_target_long)sizeof(tcg_target_long) - 1) & |
1542 |
~(sizeof(tcg_target_long) - 1); |
1543 |
#endif
|
1544 |
if (s->current_frame_offset + (tcg_target_long)sizeof(tcg_target_long) > |
1545 |
s->frame_end) { |
1546 |
tcg_abort(); |
1547 |
} |
1548 |
ts->mem_offset = s->current_frame_offset; |
1549 |
ts->mem_reg = s->frame_reg; |
1550 |
ts->mem_allocated = 1;
|
1551 |
s->current_frame_offset += (tcg_target_long)sizeof(tcg_target_long);
|
1552 |
} |
1553 |
|
1554 |
/* sync register 'reg' by saving it to the corresponding temporary */
|
1555 |
static inline void tcg_reg_sync(TCGContext *s, int reg) |
1556 |
{ |
1557 |
TCGTemp *ts; |
1558 |
int temp;
|
1559 |
|
1560 |
temp = s->reg_to_temp[reg]; |
1561 |
ts = &s->temps[temp]; |
1562 |
assert(ts->val_type == TEMP_VAL_REG); |
1563 |
if (!ts->mem_coherent && !ts->fixed_reg) {
|
1564 |
if (!ts->mem_allocated) {
|
1565 |
temp_allocate_frame(s, temp); |
1566 |
} |
1567 |
tcg_out_st(s, ts->type, reg, ts->mem_reg, ts->mem_offset); |
1568 |
} |
1569 |
ts->mem_coherent = 1;
|
1570 |
} |
1571 |
|
1572 |
/* free register 'reg' by spilling the corresponding temporary if necessary */
|
1573 |
static void tcg_reg_free(TCGContext *s, int reg) |
1574 |
{ |
1575 |
int temp;
|
1576 |
|
1577 |
temp = s->reg_to_temp[reg]; |
1578 |
if (temp != -1) { |
1579 |
tcg_reg_sync(s, reg); |
1580 |
s->temps[temp].val_type = TEMP_VAL_MEM; |
1581 |
s->reg_to_temp[reg] = -1;
|
1582 |
} |
1583 |
} |
1584 |
|
1585 |
/* Allocate a register belonging to reg1 & ~reg2 */
|
1586 |
static int tcg_reg_alloc(TCGContext *s, TCGRegSet reg1, TCGRegSet reg2) |
1587 |
{ |
1588 |
int i, reg;
|
1589 |
TCGRegSet reg_ct; |
1590 |
|
1591 |
tcg_regset_andnot(reg_ct, reg1, reg2); |
1592 |
|
1593 |
/* first try free registers */
|
1594 |
for(i = 0; i < ARRAY_SIZE(tcg_target_reg_alloc_order); i++) { |
1595 |
reg = tcg_target_reg_alloc_order[i]; |
1596 |
if (tcg_regset_test_reg(reg_ct, reg) && s->reg_to_temp[reg] == -1) |
1597 |
return reg;
|
1598 |
} |
1599 |
|
1600 |
/* XXX: do better spill choice */
|
1601 |
for(i = 0; i < ARRAY_SIZE(tcg_target_reg_alloc_order); i++) { |
1602 |
reg = tcg_target_reg_alloc_order[i]; |
1603 |
if (tcg_regset_test_reg(reg_ct, reg)) {
|
1604 |
tcg_reg_free(s, reg); |
1605 |
return reg;
|
1606 |
} |
1607 |
} |
1608 |
|
1609 |
tcg_abort(); |
1610 |
} |
1611 |
|
1612 |
/* mark a temporary as dead. */
|
1613 |
static inline void temp_dead(TCGContext *s, int temp) |
1614 |
{ |
1615 |
TCGTemp *ts; |
1616 |
|
1617 |
ts = &s->temps[temp]; |
1618 |
if (!ts->fixed_reg) {
|
1619 |
if (ts->val_type == TEMP_VAL_REG) {
|
1620 |
s->reg_to_temp[ts->reg] = -1;
|
1621 |
} |
1622 |
if (temp < s->nb_globals || (ts->temp_local && ts->mem_allocated)) {
|
1623 |
ts->val_type = TEMP_VAL_MEM; |
1624 |
} else {
|
1625 |
ts->val_type = TEMP_VAL_DEAD; |
1626 |
} |
1627 |
} |
1628 |
} |
1629 |
|
1630 |
/* sync a temporary to memory. 'allocated_regs' is used in case a
|
1631 |
temporary registers needs to be allocated to store a constant. */
|
1632 |
static inline void temp_sync(TCGContext *s, int temp, TCGRegSet allocated_regs) |
1633 |
{ |
1634 |
TCGTemp *ts; |
1635 |
|
1636 |
ts = &s->temps[temp]; |
1637 |
if (!ts->fixed_reg) {
|
1638 |
switch(ts->val_type) {
|
1639 |
case TEMP_VAL_CONST:
|
1640 |
ts->reg = tcg_reg_alloc(s, tcg_target_available_regs[ts->type], |
1641 |
allocated_regs); |
1642 |
ts->val_type = TEMP_VAL_REG; |
1643 |
s->reg_to_temp[ts->reg] = temp; |
1644 |
ts->mem_coherent = 0;
|
1645 |
tcg_out_movi(s, ts->type, ts->reg, ts->val); |
1646 |
/* fallthrough*/
|
1647 |
case TEMP_VAL_REG:
|
1648 |
tcg_reg_sync(s, ts->reg); |
1649 |
break;
|
1650 |
case TEMP_VAL_DEAD:
|
1651 |
case TEMP_VAL_MEM:
|
1652 |
break;
|
1653 |
default:
|
1654 |
tcg_abort(); |
1655 |
} |
1656 |
} |
1657 |
} |
1658 |
|
1659 |
/* save a temporary to memory. 'allocated_regs' is used in case a
|
1660 |
temporary registers needs to be allocated to store a constant. */
|
1661 |
static inline void temp_save(TCGContext *s, int temp, TCGRegSet allocated_regs) |
1662 |
{ |
1663 |
#ifdef USE_LIVENESS_ANALYSIS
|
1664 |
/* The liveness analysis already ensures that globals are back
|
1665 |
in memory. Keep an assert for safety. */
|
1666 |
assert(s->temps[temp].val_type == TEMP_VAL_MEM || s->temps[temp].fixed_reg); |
1667 |
#else
|
1668 |
temp_sync(s, temp, allocated_regs); |
1669 |
temp_dead(s, temp); |
1670 |
#endif
|
1671 |
} |
1672 |
|
1673 |
/* save globals to their canonical location and assume they can be
|
1674 |
modified be the following code. 'allocated_regs' is used in case a
|
1675 |
temporary registers needs to be allocated to store a constant. */
|
1676 |
static void save_globals(TCGContext *s, TCGRegSet allocated_regs) |
1677 |
{ |
1678 |
int i;
|
1679 |
|
1680 |
for(i = 0; i < s->nb_globals; i++) { |
1681 |
temp_save(s, i, allocated_regs); |
1682 |
} |
1683 |
} |
1684 |
|
1685 |
/* sync globals to their canonical location and assume they can be
|
1686 |
read by the following code. 'allocated_regs' is used in case a
|
1687 |
temporary registers needs to be allocated to store a constant. */
|
1688 |
static void sync_globals(TCGContext *s, TCGRegSet allocated_regs) |
1689 |
{ |
1690 |
int i;
|
1691 |
|
1692 |
for (i = 0; i < s->nb_globals; i++) { |
1693 |
#ifdef USE_LIVENESS_ANALYSIS
|
1694 |
assert(s->temps[i].val_type != TEMP_VAL_REG || s->temps[i].fixed_reg || |
1695 |
s->temps[i].mem_coherent); |
1696 |
#else
|
1697 |
temp_sync(s, i, allocated_regs); |
1698 |
#endif
|
1699 |
} |
1700 |
} |
1701 |
|
1702 |
/* at the end of a basic block, we assume all temporaries are dead and
|
1703 |
all globals are stored at their canonical location. */
|
1704 |
static void tcg_reg_alloc_bb_end(TCGContext *s, TCGRegSet allocated_regs) |
1705 |
{ |
1706 |
TCGTemp *ts; |
1707 |
int i;
|
1708 |
|
1709 |
for(i = s->nb_globals; i < s->nb_temps; i++) {
|
1710 |
ts = &s->temps[i]; |
1711 |
if (ts->temp_local) {
|
1712 |
temp_save(s, i, allocated_regs); |
1713 |
} else {
|
1714 |
#ifdef USE_LIVENESS_ANALYSIS
|
1715 |
/* The liveness analysis already ensures that temps are dead.
|
1716 |
Keep an assert for safety. */
|
1717 |
assert(ts->val_type == TEMP_VAL_DEAD); |
1718 |
#else
|
1719 |
temp_dead(s, i); |
1720 |
#endif
|
1721 |
} |
1722 |
} |
1723 |
|
1724 |
save_globals(s, allocated_regs); |
1725 |
} |
1726 |
|
1727 |
#define IS_DEAD_ARG(n) ((dead_args >> (n)) & 1) |
1728 |
#define NEED_SYNC_ARG(n) ((sync_args >> (n)) & 1) |
1729 |
|
1730 |
static void tcg_reg_alloc_movi(TCGContext *s, const TCGArg *args, |
1731 |
uint16_t dead_args, uint8_t sync_args) |
1732 |
{ |
1733 |
TCGTemp *ots; |
1734 |
tcg_target_ulong val; |
1735 |
|
1736 |
ots = &s->temps[args[0]];
|
1737 |
val = args[1];
|
1738 |
|
1739 |
if (ots->fixed_reg) {
|
1740 |
/* for fixed registers, we do not do any constant
|
1741 |
propagation */
|
1742 |
tcg_out_movi(s, ots->type, ots->reg, val); |
1743 |
} else {
|
1744 |
/* The movi is not explicitly generated here */
|
1745 |
if (ots->val_type == TEMP_VAL_REG)
|
1746 |
s->reg_to_temp[ots->reg] = -1;
|
1747 |
ots->val_type = TEMP_VAL_CONST; |
1748 |
ots->val = val; |
1749 |
} |
1750 |
if (NEED_SYNC_ARG(0)) { |
1751 |
temp_sync(s, args[0], s->reserved_regs);
|
1752 |
} |
1753 |
if (IS_DEAD_ARG(0)) { |
1754 |
temp_dead(s, args[0]);
|
1755 |
} |
1756 |
} |
1757 |
|
1758 |
static void tcg_reg_alloc_mov(TCGContext *s, const TCGOpDef *def, |
1759 |
const TCGArg *args, uint16_t dead_args,
|
1760 |
uint8_t sync_args) |
1761 |
{ |
1762 |
TCGRegSet allocated_regs; |
1763 |
TCGTemp *ts, *ots; |
1764 |
const TCGArgConstraint *arg_ct, *oarg_ct;
|
1765 |
|
1766 |
tcg_regset_set(allocated_regs, s->reserved_regs); |
1767 |
ots = &s->temps[args[0]];
|
1768 |
ts = &s->temps[args[1]];
|
1769 |
oarg_ct = &def->args_ct[0];
|
1770 |
arg_ct = &def->args_ct[1];
|
1771 |
|
1772 |
/* If the source value is not in a register, and we're going to be
|
1773 |
forced to have it in a register in order to perform the copy,
|
1774 |
then copy the SOURCE value into its own register first. That way
|
1775 |
we don't have to reload SOURCE the next time it is used. */
|
1776 |
if (((NEED_SYNC_ARG(0) || ots->fixed_reg) && ts->val_type != TEMP_VAL_REG) |
1777 |
|| ts->val_type == TEMP_VAL_MEM) { |
1778 |
ts->reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs); |
1779 |
if (ts->val_type == TEMP_VAL_MEM) {
|
1780 |
tcg_out_ld(s, ts->type, ts->reg, ts->mem_reg, ts->mem_offset); |
1781 |
ts->mem_coherent = 1;
|
1782 |
} else if (ts->val_type == TEMP_VAL_CONST) { |
1783 |
tcg_out_movi(s, ts->type, ts->reg, ts->val); |
1784 |
} |
1785 |
s->reg_to_temp[ts->reg] = args[1];
|
1786 |
ts->val_type = TEMP_VAL_REG; |
1787 |
} |
1788 |
|
1789 |
if (IS_DEAD_ARG(0) && !ots->fixed_reg) { |
1790 |
/* mov to a non-saved dead register makes no sense (even with
|
1791 |
liveness analysis disabled). */
|
1792 |
assert(NEED_SYNC_ARG(0));
|
1793 |
/* The code above should have moved the temp to a register. */
|
1794 |
assert(ts->val_type == TEMP_VAL_REG); |
1795 |
if (!ots->mem_allocated) {
|
1796 |
temp_allocate_frame(s, args[0]);
|
1797 |
} |
1798 |
tcg_out_st(s, ots->type, ts->reg, ots->mem_reg, ots->mem_offset); |
1799 |
if (IS_DEAD_ARG(1)) { |
1800 |
temp_dead(s, args[1]);
|
1801 |
} |
1802 |
temp_dead(s, args[0]);
|
1803 |
} else if (ts->val_type == TEMP_VAL_CONST) { |
1804 |
/* propagate constant */
|
1805 |
if (ots->val_type == TEMP_VAL_REG) {
|
1806 |
s->reg_to_temp[ots->reg] = -1;
|
1807 |
} |
1808 |
ots->val_type = TEMP_VAL_CONST; |
1809 |
ots->val = ts->val; |
1810 |
} else {
|
1811 |
/* The code in the first if block should have moved the
|
1812 |
temp to a register. */
|
1813 |
assert(ts->val_type == TEMP_VAL_REG); |
1814 |
if (IS_DEAD_ARG(1) && !ts->fixed_reg && !ots->fixed_reg) { |
1815 |
/* the mov can be suppressed */
|
1816 |
if (ots->val_type == TEMP_VAL_REG) {
|
1817 |
s->reg_to_temp[ots->reg] = -1;
|
1818 |
} |
1819 |
ots->reg = ts->reg; |
1820 |
temp_dead(s, args[1]);
|
1821 |
} else {
|
1822 |
if (ots->val_type != TEMP_VAL_REG) {
|
1823 |
/* When allocating a new register, make sure to not spill the
|
1824 |
input one. */
|
1825 |
tcg_regset_set_reg(allocated_regs, ts->reg); |
1826 |
ots->reg = tcg_reg_alloc(s, oarg_ct->u.regs, allocated_regs); |
1827 |
} |
1828 |
tcg_out_mov(s, ots->type, ots->reg, ts->reg); |
1829 |
} |
1830 |
ots->val_type = TEMP_VAL_REG; |
1831 |
ots->mem_coherent = 0;
|
1832 |
s->reg_to_temp[ots->reg] = args[0];
|
1833 |
if (NEED_SYNC_ARG(0)) { |
1834 |
tcg_reg_sync(s, ots->reg); |
1835 |
} |
1836 |
} |
1837 |
} |
1838 |
|
1839 |
static void tcg_reg_alloc_op(TCGContext *s, |
1840 |
const TCGOpDef *def, TCGOpcode opc,
|
1841 |
const TCGArg *args, uint16_t dead_args,
|
1842 |
uint8_t sync_args) |
1843 |
{ |
1844 |
TCGRegSet allocated_regs; |
1845 |
int i, k, nb_iargs, nb_oargs, reg;
|
1846 |
TCGArg arg; |
1847 |
const TCGArgConstraint *arg_ct;
|
1848 |
TCGTemp *ts; |
1849 |
TCGArg new_args[TCG_MAX_OP_ARGS]; |
1850 |
int const_args[TCG_MAX_OP_ARGS];
|
1851 |
|
1852 |
nb_oargs = def->nb_oargs; |
1853 |
nb_iargs = def->nb_iargs; |
1854 |
|
1855 |
/* copy constants */
|
1856 |
memcpy(new_args + nb_oargs + nb_iargs, |
1857 |
args + nb_oargs + nb_iargs, |
1858 |
sizeof(TCGArg) * def->nb_cargs);
|
1859 |
|
1860 |
/* satisfy input constraints */
|
1861 |
tcg_regset_set(allocated_regs, s->reserved_regs); |
1862 |
for(k = 0; k < nb_iargs; k++) { |
1863 |
i = def->sorted_args[nb_oargs + k]; |
1864 |
arg = args[i]; |
1865 |
arg_ct = &def->args_ct[i]; |
1866 |
ts = &s->temps[arg]; |
1867 |
if (ts->val_type == TEMP_VAL_MEM) {
|
1868 |
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs); |
1869 |
tcg_out_ld(s, ts->type, reg, ts->mem_reg, ts->mem_offset); |
1870 |
ts->val_type = TEMP_VAL_REG; |
1871 |
ts->reg = reg; |
1872 |
ts->mem_coherent = 1;
|
1873 |
s->reg_to_temp[reg] = arg; |
1874 |
} else if (ts->val_type == TEMP_VAL_CONST) { |
1875 |
if (tcg_target_const_match(ts->val, arg_ct)) {
|
1876 |
/* constant is OK for instruction */
|
1877 |
const_args[i] = 1;
|
1878 |
new_args[i] = ts->val; |
1879 |
goto iarg_end;
|
1880 |
} else {
|
1881 |
/* need to move to a register */
|
1882 |
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs); |
1883 |
tcg_out_movi(s, ts->type, reg, ts->val); |
1884 |
ts->val_type = TEMP_VAL_REG; |
1885 |
ts->reg = reg; |
1886 |
ts->mem_coherent = 0;
|
1887 |
s->reg_to_temp[reg] = arg; |
1888 |
} |
1889 |
} |
1890 |
assert(ts->val_type == TEMP_VAL_REG); |
1891 |
if (arg_ct->ct & TCG_CT_IALIAS) {
|
1892 |
if (ts->fixed_reg) {
|
1893 |
/* if fixed register, we must allocate a new register
|
1894 |
if the alias is not the same register */
|
1895 |
if (arg != args[arg_ct->alias_index])
|
1896 |
goto allocate_in_reg;
|
1897 |
} else {
|
1898 |
/* if the input is aliased to an output and if it is
|
1899 |
not dead after the instruction, we must allocate
|
1900 |
a new register and move it */
|
1901 |
if (!IS_DEAD_ARG(i)) {
|
1902 |
goto allocate_in_reg;
|
1903 |
} |
1904 |
} |
1905 |
} |
1906 |
reg = ts->reg; |
1907 |
if (tcg_regset_test_reg(arg_ct->u.regs, reg)) {
|
1908 |
/* nothing to do : the constraint is satisfied */
|
1909 |
} else {
|
1910 |
allocate_in_reg:
|
1911 |
/* allocate a new register matching the constraint
|
1912 |
and move the temporary register into it */
|
1913 |
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs); |
1914 |
tcg_out_mov(s, ts->type, reg, ts->reg); |
1915 |
} |
1916 |
new_args[i] = reg; |
1917 |
const_args[i] = 0;
|
1918 |
tcg_regset_set_reg(allocated_regs, reg); |
1919 |
iarg_end: ;
|
1920 |
} |
1921 |
|
1922 |
/* mark dead temporaries and free the associated registers */
|
1923 |
for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
|
1924 |
if (IS_DEAD_ARG(i)) {
|
1925 |
temp_dead(s, args[i]); |
1926 |
} |
1927 |
} |
1928 |
|
1929 |
if (def->flags & TCG_OPF_BB_END) {
|
1930 |
tcg_reg_alloc_bb_end(s, allocated_regs); |
1931 |
} else {
|
1932 |
if (def->flags & TCG_OPF_CALL_CLOBBER) {
|
1933 |
/* XXX: permit generic clobber register list ? */
|
1934 |
for(reg = 0; reg < TCG_TARGET_NB_REGS; reg++) { |
1935 |
if (tcg_regset_test_reg(tcg_target_call_clobber_regs, reg)) {
|
1936 |
tcg_reg_free(s, reg); |
1937 |
} |
1938 |
} |
1939 |
} |
1940 |
if (def->flags & TCG_OPF_SIDE_EFFECTS) {
|
1941 |
/* sync globals if the op has side effects and might trigger
|
1942 |
an exception. */
|
1943 |
sync_globals(s, allocated_regs); |
1944 |
} |
1945 |
|
1946 |
/* satisfy the output constraints */
|
1947 |
tcg_regset_set(allocated_regs, s->reserved_regs); |
1948 |
for(k = 0; k < nb_oargs; k++) { |
1949 |
i = def->sorted_args[k]; |
1950 |
arg = args[i]; |
1951 |
arg_ct = &def->args_ct[i]; |
1952 |
ts = &s->temps[arg]; |
1953 |
if (arg_ct->ct & TCG_CT_ALIAS) {
|
1954 |
reg = new_args[arg_ct->alias_index]; |
1955 |
} else {
|
1956 |
/* if fixed register, we try to use it */
|
1957 |
reg = ts->reg; |
1958 |
if (ts->fixed_reg &&
|
1959 |
tcg_regset_test_reg(arg_ct->u.regs, reg)) { |
1960 |
goto oarg_end;
|
1961 |
} |
1962 |
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs); |
1963 |
} |
1964 |
tcg_regset_set_reg(allocated_regs, reg); |
1965 |
/* if a fixed register is used, then a move will be done afterwards */
|
1966 |
if (!ts->fixed_reg) {
|
1967 |
if (ts->val_type == TEMP_VAL_REG) {
|
1968 |
s->reg_to_temp[ts->reg] = -1;
|
1969 |
} |
1970 |
ts->val_type = TEMP_VAL_REG; |
1971 |
ts->reg = reg; |
1972 |
/* temp value is modified, so the value kept in memory is
|
1973 |
potentially not the same */
|
1974 |
ts->mem_coherent = 0;
|
1975 |
s->reg_to_temp[reg] = arg; |
1976 |
} |
1977 |
oarg_end:
|
1978 |
new_args[i] = reg; |
1979 |
} |
1980 |
} |
1981 |
|
1982 |
/* emit instruction */
|
1983 |
tcg_out_op(s, opc, new_args, const_args); |
1984 |
|
1985 |
/* move the outputs in the correct register if needed */
|
1986 |
for(i = 0; i < nb_oargs; i++) { |
1987 |
ts = &s->temps[args[i]]; |
1988 |
reg = new_args[i]; |
1989 |
if (ts->fixed_reg && ts->reg != reg) {
|
1990 |
tcg_out_mov(s, ts->type, ts->reg, reg); |
1991 |
} |
1992 |
if (NEED_SYNC_ARG(i)) {
|
1993 |
tcg_reg_sync(s, reg); |
1994 |
} |
1995 |
if (IS_DEAD_ARG(i)) {
|
1996 |
temp_dead(s, args[i]); |
1997 |
} |
1998 |
} |
1999 |
} |
2000 |
|
2001 |
#ifdef TCG_TARGET_STACK_GROWSUP
|
2002 |
#define STACK_DIR(x) (-(x))
|
2003 |
#else
|
2004 |
#define STACK_DIR(x) (x)
|
2005 |
#endif
|
2006 |
|
2007 |
static int tcg_reg_alloc_call(TCGContext *s, const TCGOpDef *def, |
2008 |
TCGOpcode opc, const TCGArg *args,
|
2009 |
uint16_t dead_args, uint8_t sync_args) |
2010 |
{ |
2011 |
int nb_iargs, nb_oargs, flags, nb_regs, i, reg, nb_params;
|
2012 |
TCGArg arg, func_arg; |
2013 |
TCGTemp *ts; |
2014 |
tcg_target_long stack_offset, call_stack_size, func_addr; |
2015 |
int const_func_arg, allocate_args;
|
2016 |
TCGRegSet allocated_regs; |
2017 |
const TCGArgConstraint *arg_ct;
|
2018 |
|
2019 |
arg = *args++; |
2020 |
|
2021 |
nb_oargs = arg >> 16;
|
2022 |
nb_iargs = arg & 0xffff;
|
2023 |
nb_params = nb_iargs - 1;
|
2024 |
|
2025 |
flags = args[nb_oargs + nb_iargs]; |
2026 |
|
2027 |
nb_regs = ARRAY_SIZE(tcg_target_call_iarg_regs); |
2028 |
if (nb_regs > nb_params)
|
2029 |
nb_regs = nb_params; |
2030 |
|
2031 |
/* assign stack slots first */
|
2032 |
call_stack_size = (nb_params - nb_regs) * sizeof(tcg_target_long);
|
2033 |
call_stack_size = (call_stack_size + TCG_TARGET_STACK_ALIGN - 1) &
|
2034 |
~(TCG_TARGET_STACK_ALIGN - 1);
|
2035 |
allocate_args = (call_stack_size > TCG_STATIC_CALL_ARGS_SIZE); |
2036 |
if (allocate_args) {
|
2037 |
/* XXX: if more than TCG_STATIC_CALL_ARGS_SIZE is needed,
|
2038 |
preallocate call stack */
|
2039 |
tcg_abort(); |
2040 |
} |
2041 |
|
2042 |
stack_offset = TCG_TARGET_CALL_STACK_OFFSET; |
2043 |
for(i = nb_regs; i < nb_params; i++) {
|
2044 |
arg = args[nb_oargs + i]; |
2045 |
#ifdef TCG_TARGET_STACK_GROWSUP
|
2046 |
stack_offset -= sizeof(tcg_target_long);
|
2047 |
#endif
|
2048 |
if (arg != TCG_CALL_DUMMY_ARG) {
|
2049 |
ts = &s->temps[arg]; |
2050 |
if (ts->val_type == TEMP_VAL_REG) {
|
2051 |
tcg_out_st(s, ts->type, ts->reg, TCG_REG_CALL_STACK, stack_offset); |
2052 |
} else if (ts->val_type == TEMP_VAL_MEM) { |
2053 |
reg = tcg_reg_alloc(s, tcg_target_available_regs[ts->type], |
2054 |
s->reserved_regs); |
2055 |
/* XXX: not correct if reading values from the stack */
|
2056 |
tcg_out_ld(s, ts->type, reg, ts->mem_reg, ts->mem_offset); |
2057 |
tcg_out_st(s, ts->type, reg, TCG_REG_CALL_STACK, stack_offset); |
2058 |
} else if (ts->val_type == TEMP_VAL_CONST) { |
2059 |
reg = tcg_reg_alloc(s, tcg_target_available_regs[ts->type], |
2060 |
s->reserved_regs); |
2061 |
/* XXX: sign extend may be needed on some targets */
|
2062 |
tcg_out_movi(s, ts->type, reg, ts->val); |
2063 |
tcg_out_st(s, ts->type, reg, TCG_REG_CALL_STACK, stack_offset); |
2064 |
} else {
|
2065 |
tcg_abort(); |
2066 |
} |
2067 |
} |
2068 |
#ifndef TCG_TARGET_STACK_GROWSUP
|
2069 |
stack_offset += sizeof(tcg_target_long);
|
2070 |
#endif
|
2071 |
} |
2072 |
|
2073 |
/* assign input registers */
|
2074 |
tcg_regset_set(allocated_regs, s->reserved_regs); |
2075 |
for(i = 0; i < nb_regs; i++) { |
2076 |
arg = args[nb_oargs + i]; |
2077 |
if (arg != TCG_CALL_DUMMY_ARG) {
|
2078 |
ts = &s->temps[arg]; |
2079 |
reg = tcg_target_call_iarg_regs[i]; |
2080 |
tcg_reg_free(s, reg); |
2081 |
if (ts->val_type == TEMP_VAL_REG) {
|
2082 |
if (ts->reg != reg) {
|
2083 |
tcg_out_mov(s, ts->type, reg, ts->reg); |
2084 |
} |
2085 |
} else if (ts->val_type == TEMP_VAL_MEM) { |
2086 |
tcg_out_ld(s, ts->type, reg, ts->mem_reg, ts->mem_offset); |
2087 |
} else if (ts->val_type == TEMP_VAL_CONST) { |
2088 |
/* XXX: sign extend ? */
|
2089 |
tcg_out_movi(s, ts->type, reg, ts->val); |
2090 |
} else {
|
2091 |
tcg_abort(); |
2092 |
} |
2093 |
tcg_regset_set_reg(allocated_regs, reg); |
2094 |
} |
2095 |
} |
2096 |
|
2097 |
/* assign function address */
|
2098 |
func_arg = args[nb_oargs + nb_iargs - 1];
|
2099 |
arg_ct = &def->args_ct[0];
|
2100 |
ts = &s->temps[func_arg]; |
2101 |
func_addr = ts->val; |
2102 |
const_func_arg = 0;
|
2103 |
if (ts->val_type == TEMP_VAL_MEM) {
|
2104 |
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs); |
2105 |
tcg_out_ld(s, ts->type, reg, ts->mem_reg, ts->mem_offset); |
2106 |
func_arg = reg; |
2107 |
tcg_regset_set_reg(allocated_regs, reg); |
2108 |
} else if (ts->val_type == TEMP_VAL_REG) { |
2109 |
reg = ts->reg; |
2110 |
if (!tcg_regset_test_reg(arg_ct->u.regs, reg)) {
|
2111 |
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs); |
2112 |
tcg_out_mov(s, ts->type, reg, ts->reg); |
2113 |
} |
2114 |
func_arg = reg; |
2115 |
tcg_regset_set_reg(allocated_regs, reg); |
2116 |
} else if (ts->val_type == TEMP_VAL_CONST) { |
2117 |
if (tcg_target_const_match(func_addr, arg_ct)) {
|
2118 |
const_func_arg = 1;
|
2119 |
func_arg = func_addr; |
2120 |
} else {
|
2121 |
reg = tcg_reg_alloc(s, arg_ct->u.regs, allocated_regs); |
2122 |
tcg_out_movi(s, ts->type, reg, func_addr); |
2123 |
func_arg = reg; |
2124 |
tcg_regset_set_reg(allocated_regs, reg); |
2125 |
} |
2126 |
} else {
|
2127 |
tcg_abort(); |
2128 |
} |
2129 |
|
2130 |
|
2131 |
/* mark dead temporaries and free the associated registers */
|
2132 |
for(i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
|
2133 |
if (IS_DEAD_ARG(i)) {
|
2134 |
temp_dead(s, args[i]); |
2135 |
} |
2136 |
} |
2137 |
|
2138 |
/* clobber call registers */
|
2139 |
for(reg = 0; reg < TCG_TARGET_NB_REGS; reg++) { |
2140 |
if (tcg_regset_test_reg(tcg_target_call_clobber_regs, reg)) {
|
2141 |
tcg_reg_free(s, reg); |
2142 |
} |
2143 |
} |
2144 |
|
2145 |
/* Save globals if they might be written by the helper, sync them if
|
2146 |
they might be read. */
|
2147 |
if (flags & TCG_CALL_NO_READ_GLOBALS) {
|
2148 |
/* Nothing to do */
|
2149 |
} else if (flags & TCG_CALL_NO_WRITE_GLOBALS) { |
2150 |
sync_globals(s, allocated_regs); |
2151 |
} else {
|
2152 |
save_globals(s, allocated_regs); |
2153 |
} |
2154 |
|
2155 |
tcg_out_op(s, opc, &func_arg, &const_func_arg); |
2156 |
|
2157 |
/* assign output registers and emit moves if needed */
|
2158 |
for(i = 0; i < nb_oargs; i++) { |
2159 |
arg = args[i]; |
2160 |
ts = &s->temps[arg]; |
2161 |
reg = tcg_target_call_oarg_regs[i]; |
2162 |
assert(s->reg_to_temp[reg] == -1);
|
2163 |
if (ts->fixed_reg) {
|
2164 |
if (ts->reg != reg) {
|
2165 |
tcg_out_mov(s, ts->type, ts->reg, reg); |
2166 |
} |
2167 |
} else {
|
2168 |
if (ts->val_type == TEMP_VAL_REG) {
|
2169 |
s->reg_to_temp[ts->reg] = -1;
|
2170 |
} |
2171 |
ts->val_type = TEMP_VAL_REG; |
2172 |
ts->reg = reg; |
2173 |
ts->mem_coherent = 0;
|
2174 |
s->reg_to_temp[reg] = arg; |
2175 |
if (NEED_SYNC_ARG(i)) {
|
2176 |
tcg_reg_sync(s, reg); |
2177 |
} |
2178 |
if (IS_DEAD_ARG(i)) {
|
2179 |
temp_dead(s, args[i]); |
2180 |
} |
2181 |
} |
2182 |
} |
2183 |
|
2184 |
return nb_iargs + nb_oargs + def->nb_cargs + 1; |
2185 |
} |
2186 |
|
2187 |
#ifdef CONFIG_PROFILER
|
2188 |
|
2189 |
static int64_t tcg_table_op_count[NB_OPS];
|
2190 |
|
2191 |
static void dump_op_count(void) |
2192 |
{ |
2193 |
int i;
|
2194 |
FILE *f; |
2195 |
f = fopen("/tmp/op.log", "w"); |
2196 |
for(i = INDEX_op_end; i < NB_OPS; i++) {
|
2197 |
fprintf(f, "%s %" PRId64 "\n", tcg_op_defs[i].name, tcg_table_op_count[i]); |
2198 |
} |
2199 |
fclose(f); |
2200 |
} |
2201 |
#endif
|
2202 |
|
2203 |
|
2204 |
static inline int tcg_gen_code_common(TCGContext *s, uint8_t *gen_code_buf, |
2205 |
long search_pc)
|
2206 |
{ |
2207 |
TCGOpcode opc; |
2208 |
int op_index;
|
2209 |
const TCGOpDef *def;
|
2210 |
const TCGArg *args;
|
2211 |
|
2212 |
#ifdef DEBUG_DISAS
|
2213 |
if (unlikely(qemu_loglevel_mask(CPU_LOG_TB_OP))) {
|
2214 |
qemu_log("OP:\n");
|
2215 |
tcg_dump_ops(s); |
2216 |
qemu_log("\n");
|
2217 |
} |
2218 |
#endif
|
2219 |
|
2220 |
#ifdef CONFIG_PROFILER
|
2221 |
s->opt_time -= profile_getclock(); |
2222 |
#endif
|
2223 |
|
2224 |
#ifdef USE_TCG_OPTIMIZATIONS
|
2225 |
s->gen_opparam_ptr = |
2226 |
tcg_optimize(s, s->gen_opc_ptr, s->gen_opparam_buf, tcg_op_defs); |
2227 |
#endif
|
2228 |
|
2229 |
#ifdef CONFIG_PROFILER
|
2230 |
s->opt_time += profile_getclock(); |
2231 |
s->la_time -= profile_getclock(); |
2232 |
#endif
|
2233 |
|
2234 |
tcg_liveness_analysis(s); |
2235 |
|
2236 |
#ifdef CONFIG_PROFILER
|
2237 |
s->la_time += profile_getclock(); |
2238 |
#endif
|
2239 |
|
2240 |
#ifdef DEBUG_DISAS
|
2241 |
if (unlikely(qemu_loglevel_mask(CPU_LOG_TB_OP_OPT))) {
|
2242 |
qemu_log("OP after optimization and liveness analysis:\n");
|
2243 |
tcg_dump_ops(s); |
2244 |
qemu_log("\n");
|
2245 |
} |
2246 |
#endif
|
2247 |
|
2248 |
tcg_reg_alloc_start(s); |
2249 |
|
2250 |
s->code_buf = gen_code_buf; |
2251 |
s->code_ptr = gen_code_buf; |
2252 |
|
2253 |
args = s->gen_opparam_buf; |
2254 |
op_index = 0;
|
2255 |
|
2256 |
for(;;) {
|
2257 |
opc = s->gen_opc_buf[op_index]; |
2258 |
#ifdef CONFIG_PROFILER
|
2259 |
tcg_table_op_count[opc]++; |
2260 |
#endif
|
2261 |
def = &tcg_op_defs[opc]; |
2262 |
#if 0
|
2263 |
printf("%s: %d %d %d\n", def->name,
|
2264 |
def->nb_oargs, def->nb_iargs, def->nb_cargs);
|
2265 |
// dump_regs(s);
|
2266 |
#endif
|
2267 |
switch(opc) {
|
2268 |
case INDEX_op_mov_i32:
|
2269 |
case INDEX_op_mov_i64:
|
2270 |
tcg_reg_alloc_mov(s, def, args, s->op_dead_args[op_index], |
2271 |
s->op_sync_args[op_index]); |
2272 |
break;
|
2273 |
case INDEX_op_movi_i32:
|
2274 |
case INDEX_op_movi_i64:
|
2275 |
tcg_reg_alloc_movi(s, args, s->op_dead_args[op_index], |
2276 |
s->op_sync_args[op_index]); |
2277 |
break;
|
2278 |
case INDEX_op_debug_insn_start:
|
2279 |
/* debug instruction */
|
2280 |
break;
|
2281 |
case INDEX_op_nop:
|
2282 |
case INDEX_op_nop1:
|
2283 |
case INDEX_op_nop2:
|
2284 |
case INDEX_op_nop3:
|
2285 |
break;
|
2286 |
case INDEX_op_nopn:
|
2287 |
args += args[0];
|
2288 |
goto next;
|
2289 |
case INDEX_op_discard:
|
2290 |
temp_dead(s, args[0]);
|
2291 |
break;
|
2292 |
case INDEX_op_set_label:
|
2293 |
tcg_reg_alloc_bb_end(s, s->reserved_regs); |
2294 |
tcg_out_label(s, args[0], s->code_ptr);
|
2295 |
break;
|
2296 |
case INDEX_op_call:
|
2297 |
args += tcg_reg_alloc_call(s, def, opc, args, |
2298 |
s->op_dead_args[op_index], |
2299 |
s->op_sync_args[op_index]); |
2300 |
goto next;
|
2301 |
case INDEX_op_end:
|
2302 |
goto the_end;
|
2303 |
default:
|
2304 |
/* Sanity check that we've not introduced any unhandled opcodes. */
|
2305 |
if (def->flags & TCG_OPF_NOT_PRESENT) {
|
2306 |
tcg_abort(); |
2307 |
} |
2308 |
/* Note: in order to speed up the code, it would be much
|
2309 |
faster to have specialized register allocator functions for
|
2310 |
some common argument patterns */
|
2311 |
tcg_reg_alloc_op(s, def, opc, args, s->op_dead_args[op_index], |
2312 |
s->op_sync_args[op_index]); |
2313 |
break;
|
2314 |
} |
2315 |
args += def->nb_args; |
2316 |
next:
|
2317 |
if (search_pc >= 0 && search_pc < s->code_ptr - gen_code_buf) { |
2318 |
return op_index;
|
2319 |
} |
2320 |
op_index++; |
2321 |
#ifndef NDEBUG
|
2322 |
check_regs(s); |
2323 |
#endif
|
2324 |
} |
2325 |
the_end:
|
2326 |
#if defined(CONFIG_QEMU_LDST_OPTIMIZATION) && defined(CONFIG_SOFTMMU)
|
2327 |
/* Generate TB finalization at the end of block */
|
2328 |
tcg_out_tb_finalize(s); |
2329 |
#endif
|
2330 |
return -1; |
2331 |
} |
2332 |
|
2333 |
int tcg_gen_code(TCGContext *s, uint8_t *gen_code_buf)
|
2334 |
{ |
2335 |
#ifdef CONFIG_PROFILER
|
2336 |
{ |
2337 |
int n;
|
2338 |
n = (s->gen_opc_ptr - s->gen_opc_buf); |
2339 |
s->op_count += n; |
2340 |
if (n > s->op_count_max)
|
2341 |
s->op_count_max = n; |
2342 |
|
2343 |
s->temp_count += s->nb_temps; |
2344 |
if (s->nb_temps > s->temp_count_max)
|
2345 |
s->temp_count_max = s->nb_temps; |
2346 |
} |
2347 |
#endif
|
2348 |
|
2349 |
tcg_gen_code_common(s, gen_code_buf, -1);
|
2350 |
|
2351 |
/* flush instruction cache */
|
2352 |
flush_icache_range((tcg_target_ulong)gen_code_buf, |
2353 |
(tcg_target_ulong)s->code_ptr); |
2354 |
|
2355 |
return s->code_ptr - gen_code_buf;
|
2356 |
} |
2357 |
|
2358 |
/* Return the index of the micro operation such as the pc after is <
|
2359 |
offset bytes from the start of the TB. The contents of gen_code_buf must
|
2360 |
not be changed, though writing the same values is ok.
|
2361 |
Return -1 if not found. */
|
2362 |
int tcg_gen_code_search_pc(TCGContext *s, uint8_t *gen_code_buf, long offset) |
2363 |
{ |
2364 |
return tcg_gen_code_common(s, gen_code_buf, offset);
|
2365 |
} |
2366 |
|
2367 |
#ifdef CONFIG_PROFILER
|
2368 |
void tcg_dump_info(FILE *f, fprintf_function cpu_fprintf)
|
2369 |
{ |
2370 |
TCGContext *s = &tcg_ctx; |
2371 |
int64_t tot; |
2372 |
|
2373 |
tot = s->interm_time + s->code_time; |
2374 |
cpu_fprintf(f, "JIT cycles %" PRId64 " (%0.3f s at 2.4 GHz)\n", |
2375 |
tot, tot / 2.4e9); |
2376 |
cpu_fprintf(f, "translated TBs %" PRId64 " (aborted=%" PRId64 " %0.1f%%)\n", |
2377 |
s->tb_count, |
2378 |
s->tb_count1 - s->tb_count, |
2379 |
s->tb_count1 ? (double)(s->tb_count1 - s->tb_count) / s->tb_count1 * 100.0 : 0); |
2380 |
cpu_fprintf(f, "avg ops/TB %0.1f max=%d\n",
|
2381 |
s->tb_count ? (double)s->op_count / s->tb_count : 0, s->op_count_max); |
2382 |
cpu_fprintf(f, "deleted ops/TB %0.2f\n",
|
2383 |
s->tb_count ? |
2384 |
(double)s->del_op_count / s->tb_count : 0); |
2385 |
cpu_fprintf(f, "avg temps/TB %0.2f max=%d\n",
|
2386 |
s->tb_count ? |
2387 |
(double)s->temp_count / s->tb_count : 0, |
2388 |
s->temp_count_max); |
2389 |
|
2390 |
cpu_fprintf(f, "cycles/op %0.1f\n",
|
2391 |
s->op_count ? (double)tot / s->op_count : 0); |
2392 |
cpu_fprintf(f, "cycles/in byte %0.1f\n",
|
2393 |
s->code_in_len ? (double)tot / s->code_in_len : 0); |
2394 |
cpu_fprintf(f, "cycles/out byte %0.1f\n",
|
2395 |
s->code_out_len ? (double)tot / s->code_out_len : 0); |
2396 |
if (tot == 0) |
2397 |
tot = 1;
|
2398 |
cpu_fprintf(f, " gen_interm time %0.1f%%\n",
|
2399 |
(double)s->interm_time / tot * 100.0); |
2400 |
cpu_fprintf(f, " gen_code time %0.1f%%\n",
|
2401 |
(double)s->code_time / tot * 100.0); |
2402 |
cpu_fprintf(f, "optim./code time %0.1f%%\n",
|
2403 |
(double)s->opt_time / (s->code_time ? s->code_time : 1) |
2404 |
* 100.0); |
2405 |
cpu_fprintf(f, "liveness/code time %0.1f%%\n",
|
2406 |
(double)s->la_time / (s->code_time ? s->code_time : 1) * 100.0); |
2407 |
cpu_fprintf(f, "cpu_restore count %" PRId64 "\n", |
2408 |
s->restore_count); |
2409 |
cpu_fprintf(f, " avg cycles %0.1f\n",
|
2410 |
s->restore_count ? (double)s->restore_time / s->restore_count : 0); |
2411 |
|
2412 |
dump_op_count(); |
2413 |
} |
2414 |
#else
|
2415 |
void tcg_dump_info(FILE *f, fprintf_function cpu_fprintf)
|
2416 |
{ |
2417 |
cpu_fprintf(f, "[TCG profiler not compiled]\n");
|
2418 |
} |
2419 |
#endif
|
2420 |
|
2421 |
#ifdef ELF_HOST_MACHINE
|
2422 |
/* In order to use this feature, the backend needs to do three things:
|
2423 |
|
2424 |
(1) Define ELF_HOST_MACHINE to indicate both what value to
|
2425 |
put into the ELF image and to indicate support for the feature.
|
2426 |
|
2427 |
(2) Define tcg_register_jit. This should create a buffer containing
|
2428 |
the contents of a .debug_frame section that describes the post-
|
2429 |
prologue unwind info for the tcg machine.
|
2430 |
|
2431 |
(3) Call tcg_register_jit_int, with the constructed .debug_frame.
|
2432 |
*/
|
2433 |
|
2434 |
/* Begin GDB interface. THE FOLLOWING MUST MATCH GDB DOCS. */
|
2435 |
typedef enum { |
2436 |
JIT_NOACTION = 0,
|
2437 |
JIT_REGISTER_FN, |
2438 |
JIT_UNREGISTER_FN |
2439 |
} jit_actions_t; |
2440 |
|
2441 |
struct jit_code_entry {
|
2442 |
struct jit_code_entry *next_entry;
|
2443 |
struct jit_code_entry *prev_entry;
|
2444 |
const void *symfile_addr; |
2445 |
uint64_t symfile_size; |
2446 |
}; |
2447 |
|
2448 |
struct jit_descriptor {
|
2449 |
uint32_t version; |
2450 |
uint32_t action_flag; |
2451 |
struct jit_code_entry *relevant_entry;
|
2452 |
struct jit_code_entry *first_entry;
|
2453 |
}; |
2454 |
|
2455 |
void __jit_debug_register_code(void) __attribute__((noinline)); |
2456 |
void __jit_debug_register_code(void) |
2457 |
{ |
2458 |
asm(""); |
2459 |
} |
2460 |
|
2461 |
/* Must statically initialize the version, because GDB may check
|
2462 |
the version before we can set it. */
|
2463 |
struct jit_descriptor __jit_debug_descriptor = { 1, 0, 0, 0 }; |
2464 |
|
2465 |
/* End GDB interface. */
|
2466 |
|
2467 |
static int find_string(const char *strtab, const char *str) |
2468 |
{ |
2469 |
const char *p = strtab + 1; |
2470 |
|
2471 |
while (1) { |
2472 |
if (strcmp(p, str) == 0) { |
2473 |
return p - strtab;
|
2474 |
} |
2475 |
p += strlen(p) + 1;
|
2476 |
} |
2477 |
} |
2478 |
|
2479 |
static void tcg_register_jit_int(void *buf_ptr, size_t buf_size, |
2480 |
void *debug_frame, size_t debug_frame_size)
|
2481 |
{ |
2482 |
struct __attribute__((packed)) DebugInfo {
|
2483 |
uint32_t len; |
2484 |
uint16_t version; |
2485 |
uint32_t abbrev; |
2486 |
uint8_t ptr_size; |
2487 |
uint8_t cu_die; |
2488 |
uint16_t cu_lang; |
2489 |
uintptr_t cu_low_pc; |
2490 |
uintptr_t cu_high_pc; |
2491 |
uint8_t fn_die; |
2492 |
char fn_name[16]; |
2493 |
uintptr_t fn_low_pc; |
2494 |
uintptr_t fn_high_pc; |
2495 |
uint8_t cu_eoc; |
2496 |
}; |
2497 |
|
2498 |
struct ElfImage {
|
2499 |
ElfW(Ehdr) ehdr; |
2500 |
ElfW(Phdr) phdr; |
2501 |
ElfW(Shdr) shdr[7];
|
2502 |
ElfW(Sym) sym[2];
|
2503 |
struct DebugInfo di;
|
2504 |
uint8_t da[24];
|
2505 |
char str[80]; |
2506 |
}; |
2507 |
|
2508 |
struct ElfImage *img;
|
2509 |
|
2510 |
static const struct ElfImage img_template = { |
2511 |
.ehdr = { |
2512 |
.e_ident[EI_MAG0] = ELFMAG0, |
2513 |
.e_ident[EI_MAG1] = ELFMAG1, |
2514 |
.e_ident[EI_MAG2] = ELFMAG2, |
2515 |
.e_ident[EI_MAG3] = ELFMAG3, |
2516 |
.e_ident[EI_CLASS] = ELF_CLASS, |
2517 |
.e_ident[EI_DATA] = ELF_DATA, |
2518 |
.e_ident[EI_VERSION] = EV_CURRENT, |
2519 |
.e_type = ET_EXEC, |
2520 |
.e_machine = ELF_HOST_MACHINE, |
2521 |
.e_version = EV_CURRENT, |
2522 |
.e_phoff = offsetof(struct ElfImage, phdr),
|
2523 |
.e_shoff = offsetof(struct ElfImage, shdr),
|
2524 |
.e_ehsize = sizeof(ElfW(Shdr)),
|
2525 |
.e_phentsize = sizeof(ElfW(Phdr)),
|
2526 |
.e_phnum = 1,
|
2527 |
.e_shentsize = sizeof(ElfW(Shdr)),
|
2528 |
.e_shnum = ARRAY_SIZE(img->shdr), |
2529 |
.e_shstrndx = ARRAY_SIZE(img->shdr) - 1,
|
2530 |
#ifdef ELF_HOST_FLAGS
|
2531 |
.e_flags = ELF_HOST_FLAGS, |
2532 |
#endif
|
2533 |
#ifdef ELF_OSABI
|
2534 |
.e_ident[EI_OSABI] = ELF_OSABI, |
2535 |
#endif
|
2536 |
}, |
2537 |
.phdr = { |
2538 |
.p_type = PT_LOAD, |
2539 |
.p_flags = PF_X, |
2540 |
}, |
2541 |
.shdr = { |
2542 |
[0] = { .sh_type = SHT_NULL },
|
2543 |
/* Trick: The contents of code_gen_buffer are not present in
|
2544 |
this fake ELF file; that got allocated elsewhere. Therefore
|
2545 |
we mark .text as SHT_NOBITS (similar to .bss) so that readers
|
2546 |
will not look for contents. We can record any address. */
|
2547 |
[1] = { /* .text */ |
2548 |
.sh_type = SHT_NOBITS, |
2549 |
.sh_flags = SHF_EXECINSTR | SHF_ALLOC, |
2550 |
}, |
2551 |
[2] = { /* .debug_info */ |
2552 |
.sh_type = SHT_PROGBITS, |
2553 |
.sh_offset = offsetof(struct ElfImage, di),
|
2554 |
.sh_size = sizeof(struct DebugInfo), |
2555 |
}, |
2556 |
[3] = { /* .debug_abbrev */ |
2557 |
.sh_type = SHT_PROGBITS, |
2558 |
.sh_offset = offsetof(struct ElfImage, da),
|
2559 |
.sh_size = sizeof(img->da),
|
2560 |
}, |
2561 |
[4] = { /* .debug_frame */ |
2562 |
.sh_type = SHT_PROGBITS, |
2563 |
.sh_offset = sizeof(struct ElfImage), |
2564 |
}, |
2565 |
[5] = { /* .symtab */ |
2566 |
.sh_type = SHT_SYMTAB, |
2567 |
.sh_offset = offsetof(struct ElfImage, sym),
|
2568 |
.sh_size = sizeof(img->sym),
|
2569 |
.sh_info = 1,
|
2570 |
.sh_link = ARRAY_SIZE(img->shdr) - 1,
|
2571 |
.sh_entsize = sizeof(ElfW(Sym)),
|
2572 |
}, |
2573 |
[6] = { /* .strtab */ |
2574 |
.sh_type = SHT_STRTAB, |
2575 |
.sh_offset = offsetof(struct ElfImage, str),
|
2576 |
.sh_size = sizeof(img->str),
|
2577 |
} |
2578 |
}, |
2579 |
.sym = { |
2580 |
[1] = { /* code_gen_buffer */ |
2581 |
.st_info = ELF_ST_INFO(STB_GLOBAL, STT_FUNC), |
2582 |
.st_shndx = 1,
|
2583 |
} |
2584 |
}, |
2585 |
.di = { |
2586 |
.len = sizeof(struct DebugInfo) - 4, |
2587 |
.version = 2,
|
2588 |
.ptr_size = sizeof(void *), |
2589 |
.cu_die = 1,
|
2590 |
.cu_lang = 0x8001, /* DW_LANG_Mips_Assembler */ |
2591 |
.fn_die = 2,
|
2592 |
.fn_name = "code_gen_buffer"
|
2593 |
}, |
2594 |
.da = { |
2595 |
1, /* abbrev number (the cu) */ |
2596 |
0x11, 1, /* DW_TAG_compile_unit, has children */ |
2597 |
0x13, 0x5, /* DW_AT_language, DW_FORM_data2 */ |
2598 |
0x11, 0x1, /* DW_AT_low_pc, DW_FORM_addr */ |
2599 |
0x12, 0x1, /* DW_AT_high_pc, DW_FORM_addr */ |
2600 |
0, 0, /* end of abbrev */ |
2601 |
2, /* abbrev number (the fn) */ |
2602 |
0x2e, 0, /* DW_TAG_subprogram, no children */ |
2603 |
0x3, 0x8, /* DW_AT_name, DW_FORM_string */ |
2604 |
0x11, 0x1, /* DW_AT_low_pc, DW_FORM_addr */ |
2605 |
0x12, 0x1, /* DW_AT_high_pc, DW_FORM_addr */ |
2606 |
0, 0, /* end of abbrev */ |
2607 |
0 /* no more abbrev */ |
2608 |
}, |
2609 |
.str = "\0" ".text\0" ".debug_info\0" ".debug_abbrev\0" |
2610 |
".debug_frame\0" ".symtab\0" ".strtab\0" "code_gen_buffer", |
2611 |
}; |
2612 |
|
2613 |
/* We only need a single jit entry; statically allocate it. */
|
2614 |
static struct jit_code_entry one_entry; |
2615 |
|
2616 |
uintptr_t buf = (uintptr_t)buf_ptr; |
2617 |
size_t img_size = sizeof(struct ElfImage) + debug_frame_size; |
2618 |
|
2619 |
img = g_malloc(img_size); |
2620 |
*img = img_template; |
2621 |
memcpy(img + 1, debug_frame, debug_frame_size);
|
2622 |
|
2623 |
img->phdr.p_vaddr = buf; |
2624 |
img->phdr.p_paddr = buf; |
2625 |
img->phdr.p_memsz = buf_size; |
2626 |
|
2627 |
img->shdr[1].sh_name = find_string(img->str, ".text"); |
2628 |
img->shdr[1].sh_addr = buf;
|
2629 |
img->shdr[1].sh_size = buf_size;
|
2630 |
|
2631 |
img->shdr[2].sh_name = find_string(img->str, ".debug_info"); |
2632 |
img->shdr[3].sh_name = find_string(img->str, ".debug_abbrev"); |
2633 |
|
2634 |
img->shdr[4].sh_name = find_string(img->str, ".debug_frame"); |
2635 |
img->shdr[4].sh_size = debug_frame_size;
|
2636 |
|
2637 |
img->shdr[5].sh_name = find_string(img->str, ".symtab"); |
2638 |
img->shdr[6].sh_name = find_string(img->str, ".strtab"); |
2639 |
|
2640 |
img->sym[1].st_name = find_string(img->str, "code_gen_buffer"); |
2641 |
img->sym[1].st_value = buf;
|
2642 |
img->sym[1].st_size = buf_size;
|
2643 |
|
2644 |
img->di.cu_low_pc = buf; |
2645 |
img->di.cu_high_pc = buf_size; |
2646 |
img->di.fn_low_pc = buf; |
2647 |
img->di.fn_high_pc = buf_size; |
2648 |
|
2649 |
#ifdef DEBUG_JIT
|
2650 |
/* Enable this block to be able to debug the ELF image file creation.
|
2651 |
One can use readelf, objdump, or other inspection utilities. */
|
2652 |
{ |
2653 |
FILE *f = fopen("/tmp/qemu.jit", "w+b"); |
2654 |
if (f) {
|
2655 |
if (fwrite(img, img_size, 1, f) != img_size) { |
2656 |
/* Avoid stupid unused return value warning for fwrite. */
|
2657 |
} |
2658 |
fclose(f); |
2659 |
} |
2660 |
} |
2661 |
#endif
|
2662 |
|
2663 |
one_entry.symfile_addr = img; |
2664 |
one_entry.symfile_size = img_size; |
2665 |
|
2666 |
__jit_debug_descriptor.action_flag = JIT_REGISTER_FN; |
2667 |
__jit_debug_descriptor.relevant_entry = &one_entry; |
2668 |
__jit_debug_descriptor.first_entry = &one_entry; |
2669 |
__jit_debug_register_code(); |
2670 |
} |
2671 |
#else
|
2672 |
/* No support for the feature. Provide the entry point expected by exec.c,
|
2673 |
and implement the internal function we declared earlier. */
|
2674 |
|
2675 |
static void tcg_register_jit_int(void *buf, size_t size, |
2676 |
void *debug_frame, size_t debug_frame_size)
|
2677 |
{ |
2678 |
} |
2679 |
|
2680 |
void tcg_register_jit(void *buf, size_t buf_size) |
2681 |
{ |
2682 |
} |
2683 |
#endif /* ELF_HOST_MACHINE */ |