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[PATCH for-9.1 05/19] target/i386: reintroduce debugging mechanism
From: |
Paolo Bonzini |
Subject: |
[PATCH for-9.1 05/19] target/i386: reintroduce debugging mechanism |
Date: |
Tue, 9 Apr 2024 18:43:09 +0200 |
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
target/i386/tcg/translate.c | 27 +++++++++++++++++++++++++++
target/i386/tcg/decode-new.c.inc | 3 +++
2 files changed, 30 insertions(+)
diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index debc1b27283..2a372842db4 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -2971,6 +2971,9 @@ static void gen_sty_env_A0(DisasContext *s, int offset,
bool align)
tcg_gen_qemu_st_i128(t, s->tmp0, mem_index, mop);
}
+static bool first = true;
+static unsigned long limit;
+
#include "decode-new.h"
#include "emit.c.inc"
#include "decode-new.c.inc"
@@ -3126,15 +3129,39 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
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:
s->prefix = prefixes;
b = x86_ldub_code(env, s);
/* Collect prefixes. */
switch (b) {
default:
+#ifndef CONFIG_USER_ONLY
+ use_new &= b <= limit;
+#endif
+ if (use_new && 0) {
+ disas_insn_new(s, cpu, b);
+ return true;
+ }
break;
case 0x0f:
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;
case 0xf3:
prefixes |= PREFIX_REPZ;
diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc
index 426c4594120..3fc6485d74c 100644
--- a/target/i386/tcg/decode-new.c.inc
+++ b/target/i386/tcg/decode-new.c.inc
@@ -1689,6 +1689,9 @@ static void disas_insn_new(DisasContext *s, CPUState
*cpu, int b)
X86DecodeFunc decode_func = decode_root;
uint8_t cc_live;
+#ifdef CONFIG_USER_ONLY
+ if (limit) { --limit; }
+#endif
s->has_modrm = false;
next_byte:
--
2.44.0
- [PATCH for-9.1 00/19] target/i386: convert 1-byte opcodes to new decoder, Paolo Bonzini, 2024/04/09
- [PATCH for-9.1 01/19] target/i386: use TSTEQ/TSTNE to test low bits, Paolo Bonzini, 2024/04/09
- [PATCH for-9.1 02/19] target/i386: use TSTEQ/TSTNE to check flags, Paolo Bonzini, 2024/04/09
- [PATCH for-9.1 03/19] target/i386: remove mask from CCPrepare, Paolo Bonzini, 2024/04/09
- [PATCH for-9.1 04/19] target/i386: do not use s->tmp0 and s->tmp4 to compute flags, Paolo Bonzini, 2024/04/09
- [PATCH for-9.1 06/19] target/i386: move 00-5F opcodes to new decoder, Paolo Bonzini, 2024/04/09
- [PATCH for-9.1 05/19] target/i386: reintroduce debugging mechanism,
Paolo Bonzini <=
- [PATCH for-9.1 07/19] target/i386: extract gen_far_call/jmp, reordering temporaries, Paolo Bonzini, 2024/04/09
- [PATCH for-9.1 10/19] target/i386: generalize gen_movl_seg_T0, Paolo Bonzini, 2024/04/09
- [PATCH for-9.1 08/19] target/i386: allow instructions with more than one immediate, Paolo Bonzini, 2024/04/09
- [PATCH for-9.1 13/19] target/i386: move remaining conditional operations to new decoder, Paolo Bonzini, 2024/04/09
- [PATCH for-9.1 09/19] target/i386: move 60-BF opcodes to new decoder, Paolo Bonzini, 2024/04/09