root / target-cris / op_helper.c @ d8aeeb31
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/*
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* CRIS helper routines
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*
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* Copyright (c) 2007 AXIS Communications
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* Written by Edgar E. Iglesias
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "exec.h" |
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#include "mmu.h" |
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#include "helper.h" |
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#include "host-utils.h" |
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//#define CRIS_OP_HELPER_DEBUG
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#ifdef CRIS_OP_HELPER_DEBUG
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#define D(x) x
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#define D_LOG(...) qemu_log(__VA__ARGS__)
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#else
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#define D(x)
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#define D_LOG(...) do { } while (0) |
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#endif
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#if !defined(CONFIG_USER_ONLY)
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#define MMUSUFFIX _mmu
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#define SHIFT 0 |
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#include "softmmu_template.h" |
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#define SHIFT 1 |
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#include "softmmu_template.h" |
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#define SHIFT 2 |
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#include "softmmu_template.h" |
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#define SHIFT 3 |
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#include "softmmu_template.h" |
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/* Try to fill the TLB and return an exception if error. If retaddr is
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NULL, it means that the function was called in C code (i.e. not
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from generated code or from helper.c) */
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/* XXX: fix it to restore all registers */
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void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr) |
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{
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TranslationBlock *tb; |
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CPUState *saved_env; |
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unsigned long pc; |
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int ret;
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/* XXX: hack to restore env in all cases, even if not called from
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generated code */
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saved_env = env; |
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env = cpu_single_env; |
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D_LOG("%s pc=%x tpc=%x ra=%x\n", __func__,
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env->pc, env->debug1, retaddr); |
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ret = cpu_cris_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
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if (unlikely(ret)) {
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if (retaddr) {
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/* now we have a real cpu fault */
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pc = (unsigned long)retaddr; |
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tb = tb_find_pc(pc); |
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if (tb) {
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/* the PC is inside the translated code. It means that we have
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a virtual CPU fault */
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cpu_restore_state(tb, env, pc); |
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/* Evaluate flags after retranslation. */
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helper_top_evaluate_flags(); |
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} |
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} |
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cpu_loop_exit(); |
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} |
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env = saved_env; |
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} |
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#endif
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void helper_raise_exception(uint32_t index)
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{
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env->exception_index = index; |
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cpu_loop_exit(); |
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} |
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void helper_tlb_flush_pid(uint32_t pid)
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{
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#if !defined(CONFIG_USER_ONLY)
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pid &= 0xff;
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if (pid != (env->pregs[PR_PID] & 0xff)) |
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cris_mmu_flush_pid(env, env->pregs[PR_PID]); |
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#endif
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} |
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void helper_spc_write(uint32_t new_spc)
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{
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#if !defined(CONFIG_USER_ONLY)
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tlb_flush_page(env, env->pregs[PR_SPC]); |
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tlb_flush_page(env, new_spc); |
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#endif
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} |
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void helper_dump(uint32_t a0, uint32_t a1, uint32_t a2)
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{
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qemu_log("%s: a0=%x a1=%x\n", __func__, a0, a1);
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} |
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/* Used by the tlb decoder. */
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#define EXTRACT_FIELD(src, start, end) \
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(((src) >> start) & ((1 << (end - start + 1)) - 1)) |
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void helper_movl_sreg_reg (uint32_t sreg, uint32_t reg)
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{
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uint32_t srs; |
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srs = env->pregs[PR_SRS]; |
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srs &= 3;
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env->sregs[srs][sreg] = env->regs[reg]; |
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#if !defined(CONFIG_USER_ONLY)
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if (srs == 1 || srs == 2) { |
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if (sreg == 6) { |
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/* Writes to tlb-hi write to mm_cause as a side
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effect. */
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env->sregs[SFR_RW_MM_TLB_HI] = env->regs[reg]; |
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env->sregs[SFR_R_MM_CAUSE] = env->regs[reg]; |
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} |
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else if (sreg == 5) { |
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uint32_t set; |
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uint32_t idx; |
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uint32_t lo, hi; |
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uint32_t vaddr; |
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int tlb_v;
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idx = set = env->sregs[SFR_RW_MM_TLB_SEL]; |
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set >>= 4;
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set &= 3;
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idx &= 15;
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/* We've just made a write to tlb_lo. */
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lo = env->sregs[SFR_RW_MM_TLB_LO]; |
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/* Writes are done via r_mm_cause. */
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hi = env->sregs[SFR_R_MM_CAUSE]; |
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vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi,
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13, 31); |
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vaddr <<= TARGET_PAGE_BITS; |
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tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo,
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3, 3); |
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env->tlbsets[srs - 1][set][idx].lo = lo;
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env->tlbsets[srs - 1][set][idx].hi = hi;
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D_LOG("tlb flush vaddr=%x v=%d pc=%x\n",
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vaddr, tlb_v, env->pc); |
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if (tlb_v) {
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tlb_flush_page(env, vaddr); |
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} |
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} |
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} |
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#endif
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} |
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void helper_movl_reg_sreg (uint32_t reg, uint32_t sreg)
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{
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uint32_t srs; |
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env->pregs[PR_SRS] &= 3;
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srs = env->pregs[PR_SRS]; |
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#if !defined(CONFIG_USER_ONLY)
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if (srs == 1 || srs == 2) |
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{
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uint32_t set; |
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uint32_t idx; |
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uint32_t lo, hi; |
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idx = set = env->sregs[SFR_RW_MM_TLB_SEL]; |
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set >>= 4;
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set &= 3;
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idx &= 15;
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/* Update the mirror regs. */
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hi = env->tlbsets[srs - 1][set][idx].hi;
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lo = env->tlbsets[srs - 1][set][idx].lo;
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env->sregs[SFR_RW_MM_TLB_HI] = hi; |
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env->sregs[SFR_RW_MM_TLB_LO] = lo; |
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} |
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#endif
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env->regs[reg] = env->sregs[srs][sreg]; |
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} |
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static void cris_ccs_rshift(CPUState *env) |
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{
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uint32_t ccs; |
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/* Apply the ccs shift. */
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ccs = env->pregs[PR_CCS]; |
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ccs = (ccs & 0xc0000000) | ((ccs & 0x0fffffff) >> 10); |
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if (ccs & U_FLAG)
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{
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/* Enter user mode. */
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env->ksp = env->regs[R_SP]; |
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env->regs[R_SP] = env->pregs[PR_USP]; |
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} |
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env->pregs[PR_CCS] = ccs; |
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} |
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void helper_rfe(void) |
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{
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int rflag = env->pregs[PR_CCS] & R_FLAG;
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D_LOG("rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
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env->pregs[PR_ERP], env->pregs[PR_PID], |
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env->pregs[PR_CCS], |
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env->btarget); |
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cris_ccs_rshift(env); |
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/* RFE sets the P_FLAG only if the R_FLAG is not set. */
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if (!rflag)
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env->pregs[PR_CCS] |= P_FLAG; |
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} |
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void helper_rfn(void) |
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{
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int rflag = env->pregs[PR_CCS] & R_FLAG;
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D_LOG("rfn: erp=%x pid=%x ccs=%x btarget=%x\n",
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env->pregs[PR_ERP], env->pregs[PR_PID], |
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env->pregs[PR_CCS], |
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env->btarget); |
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cris_ccs_rshift(env); |
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/* Set the P_FLAG only if the R_FLAG is not set. */
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if (!rflag)
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env->pregs[PR_CCS] |= P_FLAG; |
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/* Always set the M flag. */
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env->pregs[PR_CCS] |= M_FLAG; |
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} |
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uint32_t helper_lz(uint32_t t0) |
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{
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return clz32(t0);
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} |
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uint32_t helper_btst(uint32_t t0, uint32_t t1, uint32_t ccs) |
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{
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/* FIXME: clean this up. */
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/* des ref:
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The N flag is set according to the selected bit in the dest reg.
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The Z flag is set if the selected bit and all bits to the right are
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zero.
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The X flag is cleared.
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Other flags are left untouched.
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The destination reg is not affected.*/
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unsigned int fz, sbit, bset, mask, masked_t0; |
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sbit = t1 & 31;
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bset = !!(t0 & (1 << sbit));
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mask = sbit == 31 ? -1 : (1 << (sbit + 1)) - 1; |
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masked_t0 = t0 & mask; |
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fz = !(masked_t0 | bset); |
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/* Clear the X, N and Z flags. */
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ccs = ccs & ~(X_FLAG | N_FLAG | Z_FLAG); |
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if (env->pregs[PR_VR] < 32) |
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ccs &= ~(V_FLAG | C_FLAG); |
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/* Set the N and Z flags accordingly. */
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ccs |= (bset << 3) | (fz << 2); |
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return ccs;
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} |
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static inline uint32_t evaluate_flags_writeback(uint32_t flags, uint32_t ccs) |
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{
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unsigned int x, z, mask; |
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/* Extended arithmetics, leave the z flag alone. */
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x = env->cc_x; |
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mask = env->cc_mask | X_FLAG; |
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if (x) {
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z = flags & Z_FLAG; |
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mask = mask & ~z; |
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} |
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flags &= mask; |
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/* all insn clear the x-flag except setf or clrf. */
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ccs &= ~mask; |
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ccs |= flags; |
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return ccs;
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} |
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uint32_t helper_evaluate_flags_muls(uint32_t ccs, uint32_t res, uint32_t mof) |
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{
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uint32_t flags = 0;
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int64_t tmp; |
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int dneg;
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dneg = ((int32_t)res) < 0;
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tmp = mof; |
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tmp <<= 32;
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tmp |= res; |
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if (tmp == 0) |
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flags |= Z_FLAG; |
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else if (tmp < 0) |
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flags |= N_FLAG; |
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if ((dneg && mof != -1) |
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|| (!dneg && mof != 0))
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flags |= V_FLAG; |
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return evaluate_flags_writeback(flags, ccs);
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} |
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uint32_t helper_evaluate_flags_mulu(uint32_t ccs, uint32_t res, uint32_t mof) |
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{
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uint32_t flags = 0;
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uint64_t tmp; |
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tmp = mof; |
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tmp <<= 32;
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tmp |= res; |
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if (tmp == 0) |
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flags |= Z_FLAG; |
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else if (tmp >> 63) |
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flags |= N_FLAG; |
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if (mof)
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flags |= V_FLAG; |
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return evaluate_flags_writeback(flags, ccs);
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} |
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uint32_t helper_evaluate_flags_mcp(uint32_t ccs, |
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uint32_t src, uint32_t dst, uint32_t res) |
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{
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uint32_t flags = 0;
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src = src & 0x80000000;
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dst = dst & 0x80000000;
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if ((res & 0x80000000L) != 0L) |
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{
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flags |= N_FLAG; |
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if (!src && !dst)
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flags |= V_FLAG; |
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else if (src & dst) |
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flags |= R_FLAG; |
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} |
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else
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{
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if (res == 0L) |
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flags |= Z_FLAG; |
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if (src & dst)
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flags |= V_FLAG; |
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if (dst | src)
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flags |= R_FLAG; |
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} |
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return evaluate_flags_writeback(flags, ccs);
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} |
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uint32_t helper_evaluate_flags_alu_4(uint32_t ccs, |
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uint32_t src, uint32_t dst, uint32_t res) |
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{
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uint32_t flags = 0;
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src = src & 0x80000000;
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dst = dst & 0x80000000;
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|
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if ((res & 0x80000000L) != 0L) |
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{
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flags |= N_FLAG; |
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if (!src && !dst)
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flags |= V_FLAG; |
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else if (src & dst) |
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flags |= C_FLAG; |
| 390 |
} |
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else
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{
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if (res == 0L) |
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flags |= Z_FLAG; |
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if (src & dst)
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flags |= V_FLAG; |
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if (dst | src)
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flags |= C_FLAG; |
| 399 |
} |
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|
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return evaluate_flags_writeback(flags, ccs);
|
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} |
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|
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uint32_t helper_evaluate_flags_sub_4(uint32_t ccs, |
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uint32_t src, uint32_t dst, uint32_t res) |
| 406 |
{
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uint32_t flags = 0;
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|
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src = (~src) & 0x80000000;
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dst = dst & 0x80000000;
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|
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if ((res & 0x80000000L) != 0L) |
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{
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flags |= N_FLAG; |
| 415 |
if (!src && !dst)
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flags |= V_FLAG; |
| 417 |
else if (src & dst) |
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flags |= C_FLAG; |
| 419 |
} |
| 420 |
else
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{
|
| 422 |
if (res == 0L) |
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flags |= Z_FLAG; |
| 424 |
if (src & dst)
|
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flags |= V_FLAG; |
| 426 |
if (dst | src)
|
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flags |= C_FLAG; |
| 428 |
} |
| 429 |
|
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flags ^= C_FLAG; |
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return evaluate_flags_writeback(flags, ccs);
|
| 432 |
} |
| 433 |
|
| 434 |
uint32_t helper_evaluate_flags_move_4(uint32_t ccs, uint32_t res) |
| 435 |
{
|
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uint32_t flags = 0;
|
| 437 |
|
| 438 |
if ((int32_t)res < 0) |
| 439 |
flags |= N_FLAG; |
| 440 |
else if (res == 0L) |
| 441 |
flags |= Z_FLAG; |
| 442 |
|
| 443 |
return evaluate_flags_writeback(flags, ccs);
|
| 444 |
} |
| 445 |
uint32_t helper_evaluate_flags_move_2(uint32_t ccs, uint32_t res) |
| 446 |
{
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| 447 |
uint32_t flags = 0;
|
| 448 |
|
| 449 |
if ((int16_t)res < 0L) |
| 450 |
flags |= N_FLAG; |
| 451 |
else if (res == 0) |
| 452 |
flags |= Z_FLAG; |
| 453 |
|
| 454 |
return evaluate_flags_writeback(flags, ccs);
|
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} |
| 456 |
|
| 457 |
/* TODO: This is expensive. We could split things up and only evaluate part of
|
| 458 |
CCR on a need to know basis. For now, we simply re-evaluate everything. */
|
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void helper_evaluate_flags(void) |
| 460 |
{
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uint32_t src, dst, res; |
| 462 |
uint32_t flags = 0;
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|
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src = env->cc_src; |
| 465 |
dst = env->cc_dest; |
| 466 |
res = env->cc_result; |
| 467 |
|
| 468 |
if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
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src = ~src; |
| 470 |
|
| 471 |
/* Now, evaluate the flags. This stuff is based on
|
| 472 |
Per Zander's CRISv10 simulator. */
|
| 473 |
switch (env->cc_size)
|
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{
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| 475 |
case 1: |
| 476 |
if ((res & 0x80L) != 0L) |
| 477 |
{
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flags |= N_FLAG; |
| 479 |
if (((src & 0x80L) == 0L) |
| 480 |
&& ((dst & 0x80L) == 0L)) |
| 481 |
{
|
| 482 |
flags |= V_FLAG; |
| 483 |
} |
| 484 |
else if (((src & 0x80L) != 0L) |
| 485 |
&& ((dst & 0x80L) != 0L)) |
| 486 |
{
|
| 487 |
flags |= C_FLAG; |
| 488 |
} |
| 489 |
} |
| 490 |
else
|
| 491 |
{
|
| 492 |
if ((res & 0xFFL) == 0L) |
| 493 |
{
|
| 494 |
flags |= Z_FLAG; |
| 495 |
} |
| 496 |
if (((src & 0x80L) != 0L) |
| 497 |
&& ((dst & 0x80L) != 0L)) |
| 498 |
{
|
| 499 |
flags |= V_FLAG; |
| 500 |
} |
| 501 |
if ((dst & 0x80L) != 0L |
| 502 |
|| (src & 0x80L) != 0L) |
| 503 |
{
|
| 504 |
flags |= C_FLAG; |
| 505 |
} |
| 506 |
} |
| 507 |
break;
|
| 508 |
case 2: |
| 509 |
if ((res & 0x8000L) != 0L) |
| 510 |
{
|
| 511 |
flags |= N_FLAG; |
| 512 |
if (((src & 0x8000L) == 0L) |
| 513 |
&& ((dst & 0x8000L) == 0L)) |
| 514 |
{
|
| 515 |
flags |= V_FLAG; |
| 516 |
} |
| 517 |
else if (((src & 0x8000L) != 0L) |
| 518 |
&& ((dst & 0x8000L) != 0L)) |
| 519 |
{
|
| 520 |
flags |= C_FLAG; |
| 521 |
} |
| 522 |
} |
| 523 |
else
|
| 524 |
{
|
| 525 |
if ((res & 0xFFFFL) == 0L) |
| 526 |
{
|
| 527 |
flags |= Z_FLAG; |
| 528 |
} |
| 529 |
if (((src & 0x8000L) != 0L) |
| 530 |
&& ((dst & 0x8000L) != 0L)) |
| 531 |
{
|
| 532 |
flags |= V_FLAG; |
| 533 |
} |
| 534 |
if ((dst & 0x8000L) != 0L |
| 535 |
|| (src & 0x8000L) != 0L) |
| 536 |
{
|
| 537 |
flags |= C_FLAG; |
| 538 |
} |
| 539 |
} |
| 540 |
break;
|
| 541 |
case 4: |
| 542 |
if ((res & 0x80000000L) != 0L) |
| 543 |
{
|
| 544 |
flags |= N_FLAG; |
| 545 |
if (((src & 0x80000000L) == 0L) |
| 546 |
&& ((dst & 0x80000000L) == 0L)) |
| 547 |
{
|
| 548 |
flags |= V_FLAG; |
| 549 |
} |
| 550 |
else if (((src & 0x80000000L) != 0L) && |
| 551 |
((dst & 0x80000000L) != 0L)) |
| 552 |
{
|
| 553 |
flags |= C_FLAG; |
| 554 |
} |
| 555 |
} |
| 556 |
else
|
| 557 |
{
|
| 558 |
if (res == 0L) |
| 559 |
flags |= Z_FLAG; |
| 560 |
if (((src & 0x80000000L) != 0L) |
| 561 |
&& ((dst & 0x80000000L) != 0L)) |
| 562 |
flags |= V_FLAG; |
| 563 |
if ((dst & 0x80000000L) != 0L |
| 564 |
|| (src & 0x80000000L) != 0L) |
| 565 |
flags |= C_FLAG; |
| 566 |
} |
| 567 |
break;
|
| 568 |
default:
|
| 569 |
break;
|
| 570 |
} |
| 571 |
|
| 572 |
if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
|
| 573 |
flags ^= C_FLAG; |
| 574 |
|
| 575 |
env->pregs[PR_CCS] = evaluate_flags_writeback(flags, env->pregs[PR_CCS]); |
| 576 |
} |
| 577 |
|
| 578 |
void helper_top_evaluate_flags(void) |
| 579 |
{
|
| 580 |
switch (env->cc_op)
|
| 581 |
{
|
| 582 |
case CC_OP_MCP:
|
| 583 |
env->pregs[PR_CCS] = helper_evaluate_flags_mcp( |
| 584 |
env->pregs[PR_CCS], env->cc_src, |
| 585 |
env->cc_dest, env->cc_result); |
| 586 |
break;
|
| 587 |
case CC_OP_MULS:
|
| 588 |
env->pregs[PR_CCS] = helper_evaluate_flags_muls( |
| 589 |
env->pregs[PR_CCS], env->cc_result, |
| 590 |
env->pregs[PR_MOF]); |
| 591 |
break;
|
| 592 |
case CC_OP_MULU:
|
| 593 |
env->pregs[PR_CCS] = helper_evaluate_flags_mulu( |
| 594 |
env->pregs[PR_CCS], env->cc_result, |
| 595 |
env->pregs[PR_MOF]); |
| 596 |
break;
|
| 597 |
case CC_OP_MOVE:
|
| 598 |
case CC_OP_AND:
|
| 599 |
case CC_OP_OR:
|
| 600 |
case CC_OP_XOR:
|
| 601 |
case CC_OP_ASR:
|
| 602 |
case CC_OP_LSR:
|
| 603 |
case CC_OP_LSL:
|
| 604 |
switch (env->cc_size)
|
| 605 |
{
|
| 606 |
case 4: |
| 607 |
env->pregs[PR_CCS] = |
| 608 |
helper_evaluate_flags_move_4( |
| 609 |
env->pregs[PR_CCS], |
| 610 |
env->cc_result); |
| 611 |
break;
|
| 612 |
case 2: |
| 613 |
env->pregs[PR_CCS] = |
| 614 |
helper_evaluate_flags_move_2( |
| 615 |
env->pregs[PR_CCS], |
| 616 |
env->cc_result); |
| 617 |
break;
|
| 618 |
default:
|
| 619 |
helper_evaluate_flags(); |
| 620 |
break;
|
| 621 |
} |
| 622 |
break;
|
| 623 |
case CC_OP_FLAGS:
|
| 624 |
/* live. */
|
| 625 |
break;
|
| 626 |
case CC_OP_SUB:
|
| 627 |
case CC_OP_CMP:
|
| 628 |
if (env->cc_size == 4) |
| 629 |
env->pregs[PR_CCS] = |
| 630 |
helper_evaluate_flags_sub_4( |
| 631 |
env->pregs[PR_CCS], |
| 632 |
env->cc_src, env->cc_dest, |
| 633 |
env->cc_result); |
| 634 |
else
|
| 635 |
helper_evaluate_flags(); |
| 636 |
break;
|
| 637 |
default:
|
| 638 |
{
|
| 639 |
switch (env->cc_size)
|
| 640 |
{
|
| 641 |
case 4: |
| 642 |
env->pregs[PR_CCS] = |
| 643 |
helper_evaluate_flags_alu_4( |
| 644 |
env->pregs[PR_CCS], |
| 645 |
env->cc_src, env->cc_dest, |
| 646 |
env->cc_result); |
| 647 |
break;
|
| 648 |
default:
|
| 649 |
helper_evaluate_flags(); |
| 650 |
break;
|
| 651 |
} |
| 652 |
} |
| 653 |
break;
|
| 654 |
} |
| 655 |
} |