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target/i386: reintroduce debugging mechanism

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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-09-11 11:23:55 +02:00
parent 8b5de7ea56
commit 445457693c
2 changed files with 30 additions and 0 deletions
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3
target/i386/tcg/decode-new.c.inc
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@ -1689,6 +1689,9 @@ static void disas_insn_new(DisasContext *s, CPUState *cpu, int b)
X86DecodeFunc decode_func = decode_root; X86DecodeFunc decode_func = decode_root;
uint8_t cc_live; uint8_t cc_live;
#ifdef CONFIG_USER_ONLY
if (limit) { --limit; }
#endif
s->has_modrm = false; s->has_modrm = false;
next_byte: next_byte:

27
target/i386/tcg/translate.c
View File

@ -2969,6 +2969,9 @@ static void gen_sty_env_A0(DisasContext *s, int offset, bool align)
tcg_gen_qemu_st_i128(t, s->tmp0, mem_index, mop); tcg_gen_qemu_st_i128(t, s->tmp0, mem_index, mop);
} }
static bool first = true;
static unsigned long limit;
#include "decode-new.h" #include "decode-new.h"
#include "emit.c.inc" #include "emit.c.inc"
#include "decode-new.c.inc" #include "decode-new.c.inc"
@ -3124,15 +3127,39 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
prefixes = 0; prefixes = 0;
if (first) {
const char *limit_str = getenv("QEMU_I386_LIMIT");
limit = limit_str ? atol(limit_str) : -1;
first = false;
}
bool use_new = true;
#ifdef CONFIG_USER_ONLY
use_new &= limit > 0;
#endif
next_byte: next_byte:
s->prefix = prefixes; s->prefix = prefixes;
b = x86_ldub_code(env, s); b = x86_ldub_code(env, s);
/* Collect prefixes. */ /* Collect prefixes. */
switch (b) { switch (b) {
default: default:
#ifndef CONFIG_USER_ONLY
use_new &= b <= limit;
#endif
if (use_new && 0) {
disas_insn_new(s, cpu, b);
return true;
}
break; break;
case 0x0f: case 0x0f:
b = x86_ldub_code(env, s) + 0x100; b = x86_ldub_code(env, s) + 0x100;
#ifndef CONFIG_USER_ONLY
use_new &= b <= limit;
#endif
if (use_new && 0) {
disas_insn_new(s, cpu, b);
return true;
}
break; break;
case 0xf3: case 0xf3:
prefixes |= PREFIX_REPZ; prefixes |= PREFIX_REPZ;