[PATCH v2 12/50] target/i386: Assert CODE64 for x86_64 user-only

From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: pbonzini@redhat.com, f4bug@amsat.org, ehabkost@redhat.com,
	cfontana@suse.de
Subject: [PATCH v2 12/50] target/i386: Assert CODE64 for x86_64 user-only
Date: Fri, 14 May 2021 10:13:04 -0500	[thread overview]
Message-ID: <20210514151342.384376-13-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210514151342.384376-1-richard.henderson@linaro.org>

For x86_64 user-only, there is no way to leave 64-bit mode.

Without x86_64, there is no way to enter 64-bit mode.  There is
an existing macro to aid with that; simply place it in the right
place in the ifdef chain.

Since we're adding an accessor macro, pull the value directly out
of flags when we're not assuming a constant.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/i386/tcg/translate.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index 7b5031f647..e3907f9066 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -41,11 +41,9 @@
 #define PREFIX_VEX    0x20
 
 #ifdef TARGET_X86_64
-#define CODE64(s) ((s)->code64)
 #define REX_X(s) ((s)->rex_x)
 #define REX_B(s) ((s)->rex_b)
 #else
-#define CODE64(s) 0
 #define REX_X(s) 0
 #define REX_B(s) 0
 #endif
@@ -102,7 +100,6 @@ typedef struct DisasContext {
 
 #ifdef TARGET_X86_64
     int lma;    /* long mode active */
-    int code64; /* 64 bit code segment */
     int rex_x, rex_b;
 #endif
     int vex_l;  /* vex vector length */
@@ -165,6 +162,13 @@ typedef struct DisasContext {
 #define CODE32(S) (((S)->flags & HF_CS32_MASK) != 0)
 #define SS32(S)   (((S)->flags & HF_SS32_MASK) != 0)
 #endif
+#if !defined(TARGET_X86_64)
+#define CODE64(S) false
+#elif defined(CONFIG_USER_ONLY)
+#define CODE64(S) true
+#else
+#define CODE64(S) (((S)->flags & HF_CS64_MASK) != 0)
+#endif
 
 static void gen_eob(DisasContext *s);
 static void gen_jr(DisasContext *s, TCGv dest);
@@ -8497,6 +8501,7 @@ static void i386_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cpu)
     g_assert(IOPL(dc) == iopl);
     g_assert(VM86(dc) == ((flags & HF_VM_MASK) != 0));
     g_assert(CODE32(dc) == ((flags & HF_CS32_MASK) != 0));
+    g_assert(CODE64(dc) == ((flags & HF_CS64_MASK) != 0));
     g_assert(SS32(dc) == ((flags & HF_SS32_MASK) != 0));
 
     dc->addseg = (flags >> HF_ADDSEG_SHIFT) & 1;
@@ -8518,7 +8523,6 @@ static void i386_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cpu)
     dc->cpuid_xsave_features = env->features[FEAT_XSAVE];
 #ifdef TARGET_X86_64
     dc->lma = (flags >> HF_LMA_SHIFT) & 1;
-    dc->code64 = (flags >> HF_CS64_SHIFT) & 1;
 #endif
     dc->jmp_opt = !(dc->tf || dc->base.singlestep_enabled ||
                     (flags & HF_INHIBIT_IRQ_MASK));
-- 
2.25.1


