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| author | Richard Henderson <rth@twiddle.net> | 2010-05-21 09:03:00 -0700 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2010-06-02 22:50:26 +0200 |
| commit | 96b4cf38f050d61d01d23d373ce059013b8a6090 (patch) | |
| tree | 8d70380bcd9552f4ef485883b6f4820b8b4fd21c /tcg/i386 | |
| parent | fb170183e7387ade9aef2bddd59a8a62fceedac6 (diff) | |
| download | qemu-96b4cf38f050d61d01d23d373ce059013b8a6090.tar.gz qemu-96b4cf38f050d61d01d23d373ce059013b8a6090.tar.bz2 qemu-96b4cf38f050d61d01d23d373ce059013b8a6090.zip | |
tcg-i386: Tidy data16 prefixes.
Include it in the opcode as an extension, as with P_EXT
or the REX bits in the x86-64 port.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg/i386')
| -rw-r--r-- | tcg/i386/tcg-target.c | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c index 396a2f1d53..9226c1e640 100644 --- a/tcg/i386/tcg-target.c +++ b/tcg/i386/tcg-target.c @@ -156,7 +156,8 @@ static inline int tcg_target_const_match(tcg_target_long val, return 0; } -#define P_EXT 0x100 /* 0x0f opcode prefix */ +#define P_EXT 0x100 /* 0x0f opcode prefix */ +#define P_DATA16 0x200 /* 0x66 opcode prefix */ #define OPC_ARITH_EvIz (0x81) #define OPC_ARITH_EvIb (0x83) @@ -262,8 +263,12 @@ static const uint8_t tcg_cond_to_jcc[10] = { static inline void tcg_out_opc(TCGContext *s, int opc) { - if (opc & P_EXT) + if (opc & P_DATA16) { + tcg_out8(s, 0x66); + } + if (opc & P_EXT) { tcg_out8(s, 0x0f); + } tcg_out8(s, opc); } @@ -396,10 +401,14 @@ static inline void tcg_out_st(TCGContext *s, TCGType type, int arg, static void tcg_out_shifti(TCGContext *s, int subopc, int reg, int count) { + /* Propagate an opcode prefix, such as P_DATA16. */ + int ext = subopc & ~0x7; + subopc &= 0x7; + if (count == 1) { - tcg_out_modrm(s, OPC_SHIFT_1, subopc, reg); + tcg_out_modrm(s, OPC_SHIFT_1 | ext, subopc, reg); } else { - tcg_out_modrm(s, OPC_SHIFT_Ib, subopc, reg); + tcg_out_modrm(s, OPC_SHIFT_Ib | ext, subopc, reg); tcg_out8(s, count); } } @@ -411,8 +420,7 @@ static inline void tcg_out_bswap32(TCGContext *s, int reg) static inline void tcg_out_rolw_8(TCGContext *s, int reg) { - tcg_out8(s, 0x66); - tcg_out_shifti(s, SHIFT_ROL, reg, 8); + tcg_out_shifti(s, SHIFT_ROL | P_DATA16, reg, 8); } static inline void tcg_out_ext8u(TCGContext *s, int dest, int src) @@ -1053,8 +1061,8 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, data_reg = r1; } /* movw */ - tcg_out8(s, 0x66); - tcg_out_modrm_offset(s, OPC_MOVL_EvGv, data_reg, r0, GUEST_BASE); + tcg_out_modrm_offset(s, OPC_MOVL_EvGv | P_DATA16, + data_reg, r0, GUEST_BASE); break; case 2: if (bswap) { @@ -1159,8 +1167,8 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, break; case INDEX_op_st16_i32: /* movw */ - tcg_out8(s, 0x66); - tcg_out_modrm_offset(s, OPC_MOVL_EvGv, args[0], args[1], args[2]); + tcg_out_modrm_offset(s, OPC_MOVL_EvGv | P_DATA16, + args[0], args[1], args[2]); break; case INDEX_op_st_i32: tcg_out_st(s, TCG_TYPE_I32, args[0], args[1], args[2]); |