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authorAurelien Jarno <aurelien@aurel32.net>2013-11-06 19:49:08 +0100
committerRichard Henderson <rth@twiddle.net>2014-01-25 14:12:45 -0800
commit2a1137753f9618283ac40394a75976d18f608e39 (patch)
treef5d348207ec8016ce781751afd5ac58cf2855268 /tcg
parentc9d78213b8bf6e0da9ff30b53c33e93fb0373249 (diff)
tcg/i386: add support for three-byte opcodes
Add support for three-byte opcodes, starting with the 0x0f 0x38 prefix. Use P_EXT38 as the new constant, and shift all other constants so that P_EXT and P_EXT38 have neighbouring values. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> [RTH: Changed the name from P_EXT2 to P_EXT38.] Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg')
-rw-r--r--tcg/i386/tcg-target.c24
1 files changed, 16 insertions, 8 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c
index 753b3a1c64..7161fe0dd4 100644
--- a/tcg/i386/tcg-target.c
+++ b/tcg/i386/tcg-target.c
@@ -240,13 +240,14 @@ static inline int tcg_target_const_match(tcg_target_long val,
#endif
#define P_EXT 0x100 /* 0x0f opcode prefix */
-#define P_DATA16 0x200 /* 0x66 opcode prefix */
+#define P_EXT38 0x200 /* 0x0f 0x38 opcode prefix */
+#define P_DATA16 0x400 /* 0x66 opcode prefix */
#if TCG_TARGET_REG_BITS == 64
-# define P_ADDR32 0x400 /* 0x67 opcode prefix */
-# define P_REXW 0x800 /* Set REX.W = 1 */
-# define P_REXB_R 0x1000 /* REG field as byte register */
-# define P_REXB_RM 0x2000 /* R/M field as byte register */
-# define P_GS 0x4000 /* gs segment override */
+# define P_ADDR32 0x800 /* 0x67 opcode prefix */
+# define P_REXW 0x1000 /* Set REX.W = 1 */
+# define P_REXB_R 0x2000 /* REG field as byte register */
+# define P_REXB_RM 0x4000 /* R/M field as byte register */
+# define P_GS 0x8000 /* gs segment override */
#else
# define P_ADDR32 0
# define P_REXW 0
@@ -398,9 +399,13 @@ static void tcg_out_opc(TCGContext *s, int opc, int r, int rm, int x)
tcg_out8(s, (uint8_t)(rex | 0x40));
}
- if (opc & P_EXT) {
+ if (opc & (P_EXT | P_EXT38)) {
tcg_out8(s, 0x0f);
+ if (opc & P_EXT38) {
+ tcg_out8(s, 0x38);
+ }
}
+
tcg_out8(s, opc);
}
#else
@@ -409,8 +414,11 @@ static void tcg_out_opc(TCGContext *s, int opc)
if (opc & P_DATA16) {
tcg_out8(s, 0x66);
}
- if (opc & P_EXT) {
+ if (opc & (P_EXT | P_EXT38)) {
tcg_out8(s, 0x0f);
+ if (opc & P_EXT38) {
+ tcg_out8(s, 0x38);
+ }
}
tcg_out8(s, opc);
}