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Merge remote-tracking branch 'rth/tcg-movbe' into staging 

* rth/tcg-movbe:
  tcg/i386: cleanup useless #ifdef
  tcg/i386: use movbe instruction in qemu_ldst routines
  tcg/i386: add support for three-byte opcodes
  tcg/i386: remove hardcoded P_REXW value
  disas/i386.c: disassemble movbe instruction

Message-id: 1390692772-15282-1-git-send-email-rth@twiddle.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2014-01-30 19:02:16 +00:00
parent 0706f7c85b 2d23d5edb5
commit dc08f85188
2 changed files with 101 additions and 52 deletions
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8
disas/i386.c
View File

@ -2632,17 +2632,17 @@ static const struct dis386 prefix_user_table[][4] = {
/* PREGRP87 */
{
{ "movbe", { Gv, Ev } },
{ "(bad)", { XX } },
{ "(bad)", { XX } },
{ "(bad)", { XX } },
{ "movbe", { Gv, Ev } },
{ "crc32", { Gdq, { CRC32_Fixup, b_mode } } },
},
/* PREGRP88 */
{
{ "movbe", { Ev, Gv } },
{ "(bad)", { XX } },
{ "(bad)", { XX } },
{ "(bad)", { XX } },
{ "movbe", { Ev, Gv } },
{ "crc32", { Gdq, { CRC32_Fixup, v_mode } } },
},

145
tcg/i386/tcg-target.c
View File

@ -99,18 +99,31 @@ static const int tcg_target_call_oarg_regs[] = {
# define TCG_REG_L1 TCG_REG_EDX
#endif
/* The host compiler should supply <cpuid.h> to enable runtime features
detection, as we're not going to go so far as our own inline assembly.
If not available, default values will be assumed. */
#if defined(CONFIG_CPUID_H)
#include <cpuid.h>
#endif
/* For 32-bit, we are going to attempt to determine at runtime whether cmov
is available. However, the host compiler must supply <cpuid.h>, as we're
not going to go so far as our own inline assembly. */
is available. */
#if TCG_TARGET_REG_BITS == 64
# define have_cmov 1
#elif defined(CONFIG_CPUID_H)
#include <cpuid.h>
static bool have_cmov;
#else
# define have_cmov 0
#endif
/* If bit_MOVBE is defined in cpuid.h (added in GCC version 4.6), we are
going to attempt to determine at runtime whether movbe is available. */
#if defined(CONFIG_CPUID_H) && defined(bit_MOVBE)
static bool have_movbe;
#else
# define have_movbe 0
#endif
static uint8_t *tb_ret_addr;
static void patch_reloc(uint8_t *code_ptr, int type,
@ -240,13 +253,14 @@ 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
@ -279,6 +293,8 @@ static inline int tcg_target_const_match(tcg_target_long val,
#define OPC_MOVB_EvIz (0xc6)
#define OPC_MOVL_EvIz (0xc7)
#define OPC_MOVL_Iv (0xb8)
#define OPC_MOVBE_GyMy (0xf0 | P_EXT38)
#define OPC_MOVBE_MyGy (0xf1 | P_EXT38)
#define OPC_MOVSBL (0xbe | P_EXT)
#define OPC_MOVSWL (0xbf | P_EXT)
#define OPC_MOVSLQ (0x63 | P_REXW)
@ -381,7 +397,7 @@ static void tcg_out_opc(TCGContext *s, int opc, int r, int rm, int x)
}
rex = 0;
rex |= (opc & P_REXW) >> 8; /* REX.W */
rex |= (opc & P_REXW) ? 0x8 : 0x0; /* REX.W */
rex |= (r & 8) >> 1; /* REX.R */
rex |= (x & 8) >> 2; /* REX.X */
rex |= (rm & 8) >> 3; /* REX.B */
@ -398,9 +414,13 @@ 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 +429,11 @@ 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);
}
@ -1336,7 +1359,14 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
TCGReg base, intptr_t ofs, int seg,
TCGMemOp memop)
{
const TCGMemOp bswap = memop & MO_BSWAP;
const TCGMemOp real_bswap = memop & MO_BSWAP;
TCGMemOp bswap = real_bswap;
int movop = OPC_MOVL_GvEv;
if (have_movbe && real_bswap) {
bswap = 0;
movop = OPC_MOVBE_GyMy;
}
switch (memop & MO_SSIZE) {
case MO_UB:
@ -1347,14 +1377,19 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
break;
case MO_UW:
tcg_out_modrm_offset(s, OPC_MOVZWL + seg, datalo, base, ofs);
if (bswap) {
if (real_bswap) {
tcg_out_rolw_8(s, datalo);
}
break;
case MO_SW:
if (bswap) {
tcg_out_modrm_offset(s, OPC_MOVZWL + seg, datalo, base, ofs);
tcg_out_rolw_8(s, datalo);
if (real_bswap) {
if (have_movbe) {
tcg_out_modrm_offset(s, OPC_MOVBE_GyMy + P_DATA16 + seg,
datalo, base, ofs);
} else {
tcg_out_modrm_offset(s, OPC_MOVZWL + seg, datalo, base, ofs);
tcg_out_rolw_8(s, datalo);
}
tcg_out_modrm(s, OPC_MOVSWL + P_REXW, datalo, datalo);
} else {
tcg_out_modrm_offset(s, OPC_MOVSWL + P_REXW + seg,
@ -1362,16 +1397,18 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
}
break;
case MO_UL:
tcg_out_modrm_offset(s, OPC_MOVL_GvEv + seg, datalo, base, ofs);
tcg_out_modrm_offset(s, movop + seg, datalo, base, ofs);
if (bswap) {
tcg_out_bswap32(s, datalo);
}
break;
#if TCG_TARGET_REG_BITS == 64
case MO_SL:
if (bswap) {
tcg_out_modrm_offset(s, OPC_MOVL_GvEv + seg, datalo, base, ofs);
tcg_out_bswap32(s, datalo);
if (real_bswap) {
tcg_out_modrm_offset(s, movop + seg, datalo, base, ofs);
if (bswap) {
tcg_out_bswap32(s, datalo);
}
tcg_out_ext32s(s, datalo, datalo);
} else {
tcg_out_modrm_offset(s, OPC_MOVSLQ + seg, datalo, base, ofs);
@ -1380,27 +1417,22 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
#endif
case MO_Q:
if (TCG_TARGET_REG_BITS == 64) {
tcg_out_modrm_offset(s, OPC_MOVL_GvEv + P_REXW + seg,
datalo, base, ofs);
tcg_out_modrm_offset(s, movop + P_REXW + seg, datalo, base, ofs);
if (bswap) {
tcg_out_bswap64(s, datalo);
}
} else {
if (bswap) {
if (real_bswap) {
int t = datalo;
datalo = datahi;
datahi = t;
}
if (base != datalo) {
tcg_out_modrm_offset(s, OPC_MOVL_GvEv + seg,
datalo, base, ofs);
tcg_out_modrm_offset(s, OPC_MOVL_GvEv + seg,
datahi, base, ofs + 4);
tcg_out_modrm_offset(s, movop + seg, datalo, base, ofs);
tcg_out_modrm_offset(s, movop + seg, datahi, base, ofs + 4);
} else {
tcg_out_modrm_offset(s, OPC_MOVL_GvEv + seg,
datahi, base, ofs + 4);
tcg_out_modrm_offset(s, OPC_MOVL_GvEv + seg,
datalo, base, ofs);
tcg_out_modrm_offset(s, movop + seg, datahi, base, ofs + 4);
tcg_out_modrm_offset(s, movop + seg, datalo, base, ofs);
}
if (bswap) {
tcg_out_bswap32(s, datalo);
@ -1476,13 +1508,19 @@ static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
TCGReg base, intptr_t ofs, int seg,
TCGMemOp memop)
{
const TCGMemOp bswap = memop & MO_BSWAP;
/* ??? Ideally we wouldn't need a scratch register. For user-only,
we could perform the bswap twice to restore the original value
instead of moving to the scratch. But as it is, the L constraint
means that TCG_REG_L0 is definitely free here. */
const TCGReg scratch = TCG_REG_L0;
const TCGMemOp real_bswap = memop & MO_BSWAP;
TCGMemOp bswap = real_bswap;
int movop = OPC_MOVL_EvGv;
if (have_movbe && real_bswap) {
bswap = 0;
movop = OPC_MOVBE_MyGy;
}
switch (memop & MO_SIZE) {
case MO_8:
@ -1501,8 +1539,7 @@ static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
tcg_out_rolw_8(s, scratch);
datalo = scratch;
}
tcg_out_modrm_offset(s, OPC_MOVL_EvGv + P_DATA16 + seg,
datalo, base, ofs);
tcg_out_modrm_offset(s, movop + P_DATA16 + seg, datalo, base, ofs);
break;
case MO_32:
if (bswap) {
@ -1510,7 +1547,7 @@ static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
tcg_out_bswap32(s, scratch);
datalo = scratch;
}
tcg_out_modrm_offset(s, OPC_MOVL_EvGv + seg, datalo, base, ofs);
tcg_out_modrm_offset(s, movop + seg, datalo, base, ofs);
break;
case MO_64:
if (TCG_TARGET_REG_BITS == 64) {
@ -1519,8 +1556,7 @@ static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
tcg_out_bswap64(s, scratch);
datalo = scratch;
}
tcg_out_modrm_offset(s, OPC_MOVL_EvGv + P_REXW + seg,
datalo, base, ofs);
tcg_out_modrm_offset(s, movop + P_REXW + seg, datalo, base, ofs);
} else if (bswap) {
tcg_out_mov(s, TCG_TYPE_I32, scratch, datahi);
tcg_out_bswap32(s, scratch);
@ -1529,8 +1565,13 @@ static void tcg_out_qemu_st_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
tcg_out_bswap32(s, scratch);
tcg_out_modrm_offset(s, OPC_MOVL_EvGv + seg, scratch, base, ofs+4);
} else {
tcg_out_modrm_offset(s, OPC_MOVL_EvGv + seg, datalo, base, ofs);
tcg_out_modrm_offset(s, OPC_MOVL_EvGv + seg, datahi, base, ofs+4);
if (real_bswap) {
int t = datalo;
datalo = datahi;
datahi = t;
}
tcg_out_modrm_offset(s, movop + seg, datalo, base, ofs);
tcg_out_modrm_offset(s, movop + seg, datahi, base, ofs+4);
}
break;
default:
@ -1985,9 +2026,7 @@ static const TCGTargetOpDef x86_op_defs[] = {
{ INDEX_op_setcond_i32, { "q", "r", "ri" } },
{ INDEX_op_deposit_i32, { "Q", "0", "Q" } },
#if TCG_TARGET_HAS_movcond_i32
{ INDEX_op_movcond_i32, { "r", "r", "ri", "r", "0" } },
#endif
{ INDEX_op_mulu2_i32, { "a", "d", "a", "r" } },
{ INDEX_op_muls2_i32, { "a", "d", "a", "r" } },
@ -2157,13 +2196,23 @@ static void tcg_target_qemu_prologue(TCGContext *s)
static void tcg_target_init(TCGContext *s)
{
/* For 32-bit, 99% certainty that we're running on hardware that supports
cmov, but we still need to check. In case cmov is not available, we'll
use a small forward branch. */
#ifndef have_cmov
#if !(defined(have_cmov) && defined(have_movbe))
{
unsigned a, b, c, d;
have_cmov = (__get_cpuid(1, &a, &b, &c, &d) && (d & bit_CMOV));
int ret = __get_cpuid(1, &a, &b, &c, &d);
# ifndef have_cmov
/* For 32-bit, 99% certainty that we're running on hardware that
supports cmov, but we still need to check. In case cmov is not
available, we'll use a small forward branch. */
have_cmov = ret && (d & bit_CMOV);
# endif
# ifndef have_movbe
/* MOVBE is only available on Intel Atom and Haswell CPUs, so we
need to probe for it. */
have_movbe = ret && (c & bit_MOVBE);
# endif
}
#endif