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target/i386: [tcg] Port to translate_insn

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Incrementally paves the way towards using the generic instruction translation
loop.

Backports commit 2c2f8cacd8cf4f67d6f1384b19d38f9a0a25878b from qemu
This commit is contained in:
Lluís Vilanova 2018-03-04 17:24:27 -05:00 committed by Lioncash
parent 5f020bdf07
commit bea36e432c
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 42 additions and 24 deletions
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66
qemu/target/i386/translate.c
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@ -5006,15 +5006,16 @@ static void restore_eflags(DisasContext *s, TCGContext *tcg_ctx)
/* convert one instruction. s->base.is_jmp is set if the translation must
be stopped. Return the next pc value */
static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
target_ulong pc_start) // qq
static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
{
CPUX86State *env = cpu->env_ptr;
int b, prefixes;
int shift;
TCGMemOp ot, aflag, dflag;
int modrm, reg, rm, mod, op, opreg, val;
target_ulong next_eip, tval;
int rex_w, rex_r;
target_ulong pc_start = s->base.pc_next;
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGv_ptr cpu_env = tcg_ctx->cpu_env;
TCGv_i32 cpu_tmp2_i32 = tcg_ctx->cpu_tmp2_i32;
@ -9253,6 +9254,43 @@ static bool i386_tr_breakpoint_check(DisasContextBase *dcbase, CPUState *cpu,
}
}
static void i386_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
{
DisasContext *dc = container_of(dcbase, DisasContext, base);
target_ulong pc_next = disas_insn(dc, cpu);
if (dc->tf || (dc->base.tb->flags & HF_INHIBIT_IRQ_MASK)) {
/* if single step mode, we generate only one instruction and
generate an exception */
/* if irq were inhibited with HF_INHIBIT_IRQ_MASK, we clear
the flag and abort the translation to give the irqs a
chance to happen */
gen_jmp_im(dc, pc_next - dc->cs_base);
gen_eob(dc);
dc->base.is_jmp = DISAS_TOO_MANY;
} else if ((dc->base.tb->cflags & CF_USE_ICOUNT)
&& ((dc->base.pc_next & TARGET_PAGE_MASK)
!= ((dc->base.pc_next + TARGET_MAX_INSN_SIZE - 1)
& TARGET_PAGE_MASK)
|| (dc->base.pc_next & ~TARGET_PAGE_MASK) == 0)) {
/* Do not cross the boundary of the pages in icount mode,
it can cause an exception. Do it only when boundary is
crossed by the first instruction in the block.
If current instruction already crossed the bound - it's ok,
because an exception hasn't stopped this code.
*/
gen_jmp_im(dc, pc_next - dc->cs_base);
gen_eob(dc);
dc->base.is_jmp = DISAS_TOO_MANY;
} else if ((pc_next - dc->base.pc_first) >= (TARGET_PAGE_SIZE - 32)) {
gen_jmp_im(dc, pc_next - dc->cs_base);
gen_eob(dc);
dc->base.is_jmp = DISAS_TOO_MANY;
}
dc->base.pc_next = pc_next;
}
/* generate intermediate code for basic block 'tb'. */
void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
{
@ -9329,40 +9367,20 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb)
// Unicorn: save current PC address to sync EIP
dc->prev_pc = dc->base.pc_next;
dc->base.pc_next = disas_insn(env, dc, dc->base.pc_next);
i386_tr_translate_insn(&dc->base, cs);
/* stop translation if indicated */
if (dc->base.is_jmp) {
break;
}
/* if single step mode, we generate only one instruction and
generate an exception */
/* if irq were inhibited with HF_INHIBIT_IRQ_MASK, we clear
the flag and abort the translation to give the irqs a
change to be happen */
if (dc->tf || dc->base.singlestep_enabled ||
(dc->base.tb->flags & HF_INHIBIT_IRQ_MASK)) {
if (dc->base.singlestep_enabled) {
gen_jmp_im(dc, dc->base.pc_next - dc->cs_base);
gen_eob(dc);
break;
}
/* Do not cross the boundary of the pages in icount mode,
it can cause an exception. Do it only when boundary is
crossed by the first instruction in the block.
If current instruction already crossed the bound - it's ok,
because an exception hasn't stopped this code.
*/
/* UNICORN: Commented out
if (use_icount
&& ((dc->base.pc_next & TARGET_PAGE_MASK)
!= ((dc->base.pc_next + TARGET_MAX_INSN_SIZE - 1) & TARGET_PAGE_MASK)
|| (dc->base.pc_next & ~TARGET_PAGE_MASK) == 0)) {
gen_jmp_im(dc, dc->base.pc_next - dc->cs_base);
gen_eob(dc);
break;
}*/
/* if too long translation, stop generation too */
if (tcg_op_buf_full(tcg_ctx) ||
(dc->base.pc_next - dc->base.pc_first) >= (TARGET_PAGE_SIZE - 32) ||
num_insns >= max_insns) {
gen_jmp_im(dc, dc->base.pc_next - dc->cs_base);
gen_eob(dc);