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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>
This commit is contained in:
Aurelien Jarno 2013-11-06 19:49:08 +01:00 committed by Richard Henderson
parent c9d78213b8
commit 2a1137753f
1 changed files with 16 additions and 8 deletions
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24
tcg/i386/tcg-target.c
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@ -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);
}