Archipelago » qemu

/*

 * Tiny Code Generator for QEMU

 *

 * Copyright (c) 2008 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include <assert.h>

#include <stdarg.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <inttypes.h>

#include "config.h"

#include "osdep.h"

#include "tcg.h"

int __op_param1, __op_param2, __op_param3;

#if defined(__sparc__) || defined(__arm__)

  void __op_gen_label1(){}

  void __op_gen_label2(){}

  void __op_gen_label3(){}

#else

  int __op_gen_label1, __op_gen_label2, __op_gen_label3;

#endif

int __op_jmp0, __op_jmp1, __op_jmp2, __op_jmp3;

#if 0

#if defined(__s390__)

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

}

#elif defined(__ia64__)

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

    while (start < stop) {

        asm volatile ("fc %0" :: "r"(start));

        start += 32;

    }

    asm volatile (";;sync.i;;srlz.i;;");

}

#elif defined(__powerpc__)

#define MIN_CACHE_LINE_SIZE 8 /* conservative value */

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

    unsigned long p;

    start &= ~(MIN_CACHE_LINE_SIZE - 1);

    stop = (stop + MIN_CACHE_LINE_SIZE - 1) & ~(MIN_CACHE_LINE_SIZE - 1);

    for (p = start; p < stop; p += MIN_CACHE_LINE_SIZE) {

        asm volatile ("dcbst 0,%0" : : "r"(p) : "memory");

    }

    asm volatile ("sync" : : : "memory");

    for (p = start; p < stop; p += MIN_CACHE_LINE_SIZE) {

        asm volatile ("icbi 0,%0" : : "r"(p) : "memory");

    }

    asm volatile ("sync" : : : "memory");

    asm volatile ("isync" : : : "memory");

}

#elif defined(__alpha__)

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

    asm ("imb");

}

#elif defined(__sparc__)

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

        unsigned long p;

        p = start & ~(8UL - 1UL);

        stop = (stop + (8UL - 1UL)) & ~(8UL - 1UL);

        for (; p < stop; p += 8)

                __asm__ __volatile__("flush\t%0" : : "r" (p));

}

#elif defined(__arm__)

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

    register unsigned long _beg __asm ("a1") = start;

    register unsigned long _end __asm ("a2") = stop;

    register unsigned long _flg __asm ("a3") = 0;

    __asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));

}

#elif defined(__mc68000)

# include <asm/cachectl.h>

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

    cacheflush(start,FLUSH_SCOPE_LINE,FLUSH_CACHE_BOTH,stop-start+16);

}

#elif defined(__mips__)

#include <sys/cachectl.h>

static inline void flush_icache_range(unsigned long start, unsigned long stop)

{

    _flush_cache ((void *)start, stop - start, BCACHE);

}

#else

#error unsupported CPU

#endif

#ifdef __alpha__

register int gp asm("$29");

static inline void immediate_ldah(void *p, int val) {

    uint32_t *dest = p;

    long high = ((val >> 16) + ((val >> 15) & 1)) & 0xffff;

    *dest &= ~0xffff;

    *dest |= high;

    *dest |= 31 << 16;

}

static inline void immediate_lda(void *dest, int val) {

    *(uint16_t *) dest = val;

}

void fix_bsr(void *p, int offset) {

    uint32_t *dest = p;

    *dest &= ~((1 << 21) - 1);

    *dest |= (offset >> 2) & ((1 << 21) - 1);

}

#endif /* __alpha__ */

#ifdef __arm__

#define ARM_LDR_TABLE_SIZE 1024

typedef struct LDREntry {

    uint8_t *ptr;

    uint32_t *data_ptr;

    unsigned type:2;

} LDREntry;

static LDREntry arm_ldr_table[1024];

static uint32_t arm_data_table[ARM_LDR_TABLE_SIZE];

extern char exec_loop;

static inline void arm_reloc_pc24(uint32_t *ptr, uint32_t insn, int val)

{

    *ptr = (insn & ~0xffffff) | ((insn + ((val - (int)ptr) >> 2)) & 0xffffff);

}

static uint8_t *arm_flush_ldr(uint8_t *gen_code_ptr,

                              LDREntry *ldr_start, LDREntry *ldr_end,

                              uint32_t *data_start, uint32_t *data_end,

                              int gen_jmp)

{

    LDREntry *le;

    uint32_t *ptr;

    int offset, data_size, target;

    uint8_t *data_ptr;

    uint32_t insn;

    uint32_t mask;

    data_size = (data_end - data_start) << 2;

    if (gen_jmp) {

        /* generate branch to skip the data */

        if (data_size == 0)

            return gen_code_ptr;

        target = (long)gen_code_ptr + data_size + 4;

        arm_reloc_pc24((uint32_t *)gen_code_ptr, 0xeafffffe, target);

        gen_code_ptr += 4;

    }

    /* copy the data */

    data_ptr = gen_code_ptr;

    memcpy(gen_code_ptr, data_start, data_size);

    gen_code_ptr += data_size;

    /* patch the ldr to point to the data */

    for(le = ldr_start; le < ldr_end; le++) {

        ptr = (uint32_t *)le->ptr;

        offset = ((unsigned long)(le->data_ptr) - (unsigned long)data_start) +

            (unsigned long)data_ptr -

            (unsigned long)ptr - 8;

        if (offset < 0) {

            fprintf(stderr, "Negative constant pool offset\n");

            tcg_abort();

        }

        switch (le->type) {

          case 0: /* ldr */

            mask = ~0x00800fff;

            if (offset >= 4096) {

                fprintf(stderr, "Bad ldr offset\n");

                tcg_abort();

            }

            break;

          case 1: /* ldc */

            mask = ~0x008000ff;

            if (offset >= 1024 ) {

                fprintf(stderr, "Bad ldc offset\n");

                tcg_abort();

            }

            break;

          case 2: /* add */

            mask = ~0xfff;

            if (offset >= 1024 ) {

                fprintf(stderr, "Bad add offset\n");

                tcg_abort();

            }

            break;

          default:

            fprintf(stderr, "Bad pc relative fixup\n");

            tcg_abort();

          }

        insn = *ptr & mask;

        switch (le->type) {

          case 0: /* ldr */

            insn |= offset | 0x00800000;

            break;

          case 1: /* ldc */

            insn |= (offset >> 2) | 0x00800000;

            break;

          case 2: /* add */

            insn |= (offset >> 2) | 0xf00;

            break;

          }

        *ptr = insn;

    }

    return gen_code_ptr;

}

#endif /* __arm__ */

#ifdef __ia64

/* Patch instruction with "val" where "mask" has 1 bits. */

static inline void ia64_patch (uint64_t insn_addr, uint64_t mask, uint64_t val)

{

    uint64_t m0, m1, v0, v1, b0, b1, *b = (uint64_t *) (insn_addr & -16);

#   define insn_mask ((1UL << 41) - 1)

    unsigned long shift;

    b0 = b[0]; b1 = b[1];

    shift = 5 + 41 * (insn_addr % 16); /* 5 template, 3 x 41-bit insns */

    if (shift >= 64) {

        m1 = mask << (shift - 64);

        v1 = val << (shift - 64);

    } else {

        m0 = mask << shift; m1 = mask >> (64 - shift);

        v0 = val  << shift; v1 = val >> (64 - shift);

        b[0] = (b0 & ~m0) | (v0 & m0);

    }

    b[1] = (b1 & ~m1) | (v1 & m1);

}

static inline void ia64_patch_imm60 (uint64_t insn_addr, uint64_t val)

{

        ia64_patch(insn_addr,

                   0x011ffffe000UL,

                   (  ((val & 0x0800000000000000UL) >> 23) /* bit 59 -> 36 */

                    | ((val & 0x00000000000fffffUL) << 13) /* bit 0 -> 13 */));

        ia64_patch(insn_addr - 1, 0x1fffffffffcUL, val >> 18);

}

static inline void ia64_imm64 (void *insn, uint64_t val)

{

    /* Ignore the slot number of the relocation; GCC and Intel

       toolchains differed for some time on whether IMM64 relocs are

       against slot 1 (Intel) or slot 2 (GCC).  */

    uint64_t insn_addr = (uint64_t) insn & ~3UL;

    ia64_patch(insn_addr + 2,

               0x01fffefe000UL,

               (  ((val & 0x8000000000000000UL) >> 27) /* bit 63 -> 36 */

                | ((val & 0x0000000000200000UL) <<  0) /* bit 21 -> 21 */

                | ((val & 0x00000000001f0000UL) <<  6) /* bit 16 -> 22 */

                | ((val & 0x000000000000ff80UL) << 20) /* bit  7 -> 27 */

                | ((val & 0x000000000000007fUL) << 13) /* bit  0 -> 13 */)

            );

    ia64_patch(insn_addr + 1, 0x1ffffffffffUL, val >> 22);

}

static inline void ia64_imm60b (void *insn, uint64_t val)

{

    /* Ignore the slot number of the relocation; GCC and Intel

       toolchains differed for some time on whether IMM64 relocs are

       against slot 1 (Intel) or slot 2 (GCC).  */

    uint64_t insn_addr = (uint64_t) insn & ~3UL;

    if (val + ((uint64_t) 1 << 59) >= (1UL << 60))

        fprintf(stderr, "%s: value %ld out of IMM60 range\n",

                __FUNCTION__, (int64_t) val);

    ia64_patch_imm60(insn_addr + 2, val);

}

static inline void ia64_imm22 (void *insn, uint64_t val)

{

    if (val + (1 << 21) >= (1 << 22))

        fprintf(stderr, "%s: value %li out of IMM22 range\n",

                __FUNCTION__, (int64_t)val);

    ia64_patch((uint64_t) insn, 0x01fffcfe000UL,

               (  ((val & 0x200000UL) << 15) /* bit 21 -> 36 */

                | ((val & 0x1f0000UL) <<  6) /* bit 16 -> 22 */

                | ((val & 0x00ff80UL) << 20) /* bit  7 -> 27 */

                | ((val & 0x00007fUL) << 13) /* bit  0 -> 13 */));

}

/* Like ia64_imm22(), but also clear bits 20-21.  For addl, this has

   the effect of turning "addl rX=imm22,rY" into "addl

   rX=imm22,r0".  */

static inline void ia64_imm22_r0 (void *insn, uint64_t val)

{

    if (val + (1 << 21) >= (1 << 22))

        fprintf(stderr, "%s: value %li out of IMM22 range\n",

                __FUNCTION__, (int64_t)val);

    ia64_patch((uint64_t) insn, 0x01fffcfe000UL | (0x3UL << 20),

               (  ((val & 0x200000UL) << 15) /* bit 21 -> 36 */

                | ((val & 0x1f0000UL) <<  6) /* bit 16 -> 22 */

                | ((val & 0x00ff80UL) << 20) /* bit  7 -> 27 */

                | ((val & 0x00007fUL) << 13) /* bit  0 -> 13 */));

}

static inline void ia64_imm21b (void *insn, uint64_t val)

{

    if (val + (1 << 20) >= (1 << 21))

        fprintf(stderr, "%s: value %li out of IMM21b range\n",

                __FUNCTION__, (int64_t)val);

    ia64_patch((uint64_t) insn, 0x11ffffe000UL,

               (  ((val & 0x100000UL) << 16) /* bit 20 -> 36 */

                | ((val & 0x0fffffUL) << 13) /* bit  0 -> 13 */));

}

static inline void ia64_nop_b (void *insn)

{

    ia64_patch((uint64_t) insn, (1UL << 41) - 1, 2UL << 37);

}

static inline void ia64_ldxmov(void *insn, uint64_t val)

{

    if (val + (1 << 21) < (1 << 22))

        ia64_patch((uint64_t) insn, 0x1fff80fe000UL, 8UL << 37);

}

static inline int ia64_patch_ltoff(void *insn, uint64_t val,

                                   int relaxable)

{

    if (relaxable && (val + (1 << 21) < (1 << 22))) {

        ia64_imm22_r0(insn, val);

        return 0;

    }

    return 1;

}

struct ia64_fixup {

    struct ia64_fixup *next;

    void *addr;                        /* address that needs to be patched */

    long value;

};

#define IA64_PLT(insn, plt_index)                        \

do {                                                        \

    struct ia64_fixup *fixup = alloca(sizeof(*fixup));        \

    fixup->next = plt_fixes;                                \

    plt_fixes = fixup;                                        \

    fixup->addr = (insn);                                \

    fixup->value = (plt_index);                                \

    plt_offset[(plt_index)] = 1;                        \

} while (0)

#define IA64_LTOFF(insn, val, relaxable)                        \

do {                                                                \

    if (ia64_patch_ltoff(insn, val, relaxable)) {                \

        struct ia64_fixup *fixup = alloca(sizeof(*fixup));        \

        fixup->next = ltoff_fixes;                                \

        ltoff_fixes = fixup;                                        \

        fixup->addr = (insn);                                        \

        fixup->value = (val);                                        \

    }                                                                \

} while (0)

static inline void ia64_apply_fixes (uint8_t **gen_code_pp,

                                     struct ia64_fixup *ltoff_fixes,

                                     uint64_t gp,

                                     struct ia64_fixup *plt_fixes,

                                     int num_plts,

                                     unsigned long *plt_target,

                                     unsigned int *plt_offset)

{

    static const uint8_t plt_bundle[] = {

        0x04, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,        /* nop 0; movl r1=GP */

        0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x60,

        0x05, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,        /* nop 0; brl IP */

        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0

    };

    uint8_t *gen_code_ptr = *gen_code_pp, *plt_start, *got_start;

    uint64_t *vp;

    struct ia64_fixup *fixup;

    unsigned int offset = 0;

    struct fdesc {

        long ip;

        long gp;

    } *fdesc;

    int i;

    if (plt_fixes) {

        plt_start = gen_code_ptr;

        for (i = 0; i < num_plts; ++i) {

            if (plt_offset[i]) {

                plt_offset[i] = offset;

                offset += sizeof(plt_bundle);

                fdesc = (struct fdesc *) plt_target[i];

                memcpy(gen_code_ptr, plt_bundle, sizeof(plt_bundle));

                ia64_imm64 (gen_code_ptr + 0x02, fdesc->gp);

                ia64_imm60b(gen_code_ptr + 0x12,

                            (fdesc->ip - (long) (gen_code_ptr + 0x10)) >> 4);

                gen_code_ptr += sizeof(plt_bundle);

            }

        }

        for (fixup = plt_fixes; fixup; fixup = fixup->next)

            ia64_imm21b(fixup->addr,

                        ((long) plt_start + plt_offset[fixup->value]

                         - ((long) fixup->addr & ~0xf)) >> 4);

    }

    got_start = gen_code_ptr;

    /* First, create the GOT: */

    for (fixup = ltoff_fixes; fixup; fixup = fixup->next) {

        /* first check if we already have this value in the GOT: */

        for (vp = (uint64_t *) got_start; vp < (uint64_t *) gen_code_ptr; ++vp)

            if (*vp == fixup->value)

                break;

        if (vp == (uint64_t *) gen_code_ptr) {

            /* Nope, we need to put the value in the GOT: */

            *vp = fixup->value;

            gen_code_ptr += 8;

        }

        ia64_imm22(fixup->addr, (long) vp - gp);

    }

    /* Keep code ptr aligned. */

    if ((long) gen_code_ptr & 15)

        gen_code_ptr += 8;

    *gen_code_pp = gen_code_ptr;

}

#endif

#endif

#ifndef CONFIG_NO_DYNGEN_OP

#if defined __hppa__

struct hppa_branch_stub {

    uint32_t *location;

    long target;

    struct hppa_branch_stub *next;

};

#define HPPA_RECORD_BRANCH(LIST, LOC, TARGET) \

do { \

    struct hppa_branch_stub *stub = alloca(sizeof(struct hppa_branch_stub)); \

    stub->location = LOC; \

    stub->target = TARGET; \

    stub->next = LIST; \

    LIST = stub; \

} while (0)

static inline void hppa_process_stubs(struct hppa_branch_stub *stub,

                                      uint8_t **gen_code_pp)

{

    uint32_t *s = (uint32_t *)*gen_code_pp;

    uint32_t *p = s + 1;

    if (!stub) return;

    for (; stub != NULL; stub = stub->next) {

        unsigned long l = (unsigned long)p;

        /* stub:

         * ldil L'target, %r1

         * be,n R'target(%sr4,%r1)

         */

        *p++ = 0x20200000 | reassemble_21(lrsel(stub->target, 0));

        *p++ = 0xe0202002 | (reassemble_17(rrsel(stub->target, 0) >> 2));

        hppa_patch17f(stub->location, l, 0);

    }

    /* b,l,n stub,%r0 */

    *s = 0xe8000002 | reassemble_17((p - s) - 2);

    *gen_code_pp = (uint8_t *)p;

}

#endif /* __hppa__ */

const TCGArg *dyngen_op(TCGContext *s, int opc, const TCGArg *opparam_ptr)

{

    uint8_t *gen_code_ptr;

#ifdef __hppa__

    struct hppa_branch_stub *hppa_stubs = NULL;

#endif

    gen_code_ptr = s->code_ptr;

    switch(opc) {

/* op.h is dynamically generated by dyngen.c from op.c */

#include "op.h"

    default:

        tcg_abort();

    }

#ifdef __hppa__

    hppa_process_stubs(hppa_stubs, &gen_code_ptr);

#endif

    s->code_ptr = gen_code_ptr;

    return opparam_ptr;

}

#endif