[v2,10/50] target/i386: Assert CODE32 for x86_64 user-only

Commit Message

Richard Henderson May 14, 2021, 3:13 p.m. UTC

For user-only, CODE32 == !VM86, because we are never in real-mode.
Since we cannot enter vm86 mode for x86_64 user-only, CODE32 is
always set.

Since we're adding an accessor macro, pull the value directly out
of flags otherwise.

Signed-off-by: Richard Henderson <[e-mail]>
---
 target/i386/tcg/translate.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

Comments

Paolo Bonzini May 18, 2021, 9:20 a.m. UTC | #1

On 14/05/21 17:13, Richard Henderson wrote:
> For user-only, CODE32 == !VM86, because we are never in real-mode.
> Since we cannot enter vm86 mode for x86_64 user-only, CODE32 is
> always set.
> 
> Since we're adding an accessor macro, pull the value directly out
> of flags otherwise.
> 
> Signed-off-by: Richard Henderson <[e-mail]>
> ---
>   target/i386/tcg/translate.c | 13 +++++++------
>   1 file changed, 7 insertions(+), 6 deletions(-)

Reviewed-by: Paolo Bonzini <[e-mail]>

Patch

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index 27806f35f9..b570921410 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -100,7 +100,6 @@  typedef struct DisasContext {
     uint8_t iopl;  /* i/o priv level */
 #endif
 
-    int code32; /* 32 bit code segment */
 #ifdef TARGET_X86_64
     int lma;    /* long mode active */
     int code64; /* 64 bit code segment */
@@ -160,8 +159,10 @@  typedef struct DisasContext {
 #endif
 #if defined(CONFIG_USER_ONLY) && defined(TARGET_X86_64)
 #define VM86(S)   false
+#define CODE32(S) true
 #else
 #define VM86(S)   (((S)->flags & HF_VM_MASK) != 0)
+#define CODE32(S) (((S)->flags & HF_CS32_MASK) != 0)
 #endif
 
 static void gen_eob(DisasContext *s);
@@ -2370,7 +2371,7 @@  static void gen_movl_seg_T0(DisasContext *s, X86Seg seg_reg)
            because ss32 may change. For R_SS, translation must always
            stop as a special handling must be done to disable hardware
            interrupts for the next instruction */
-        if (seg_reg == R_SS || (s->code32 && seg_reg < R_FS)) {
+        if (seg_reg == R_SS || (CODE32(s) && seg_reg < R_FS)) {
             s->base.is_jmp = DISAS_TOO_MANY;
         }
     } else {
@@ -4619,7 +4620,7 @@  static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
     case 0xc4: /* 3-byte VEX */
         /* VEX prefixes cannot be used except in 32-bit mode.
            Otherwise the instruction is LES or LDS.  */
-        if (s->code32 && !VM86(s)) {
+        if (CODE32(s) && !VM86(s)) {
             static const int pp_prefix[4] = {
                 0, PREFIX_DATA, PREFIX_REPZ, PREFIX_REPNZ
             };
@@ -4686,13 +4687,13 @@  static target_ulong disas_insn(DisasContext *s, CPUState *cpu)
         aflag = (prefixes & PREFIX_ADR ? MO_32 : MO_64);
     } else {
         /* In 16/32-bit mode, 0x66 selects the opposite data size.  */
-        if (s->code32 ^ ((prefixes & PREFIX_DATA) != 0)) {
+        if (CODE32(s) ^ ((prefixes & PREFIX_DATA) != 0)) {
             dflag = MO_32;
         } else {
             dflag = MO_16;
         }
         /* In 16/32-bit mode, 0x67 selects the opposite addressing.  */
-        if (s->code32 ^ ((prefixes & PREFIX_ADR) != 0)) {
+        if (CODE32(s) ^ ((prefixes & PREFIX_ADR) != 0)) {
             aflag = MO_32;
         }  else {
             aflag = MO_16;
@@ -8494,8 +8495,8 @@  static void i386_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cpu)
     g_assert(CPL(dc) == cpl);
     g_assert(IOPL(dc) == iopl);
     g_assert(VM86(dc) == ((flags & HF_VM_MASK) != 0));
+    g_assert(CODE32(dc) == ((flags & HF_CS32_MASK) != 0));
 
-    dc->code32 = (flags >> HF_CS32_SHIFT) & 1;
     dc->ss32 = (flags >> HF_SS32_SHIFT) & 1;
     dc->addseg = (flags >> HF_ADDSEG_SHIFT) & 1;
     dc->f_st = 0;