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Diffstat (limited to 'tcg/i386/tcg-target.c')
-rw-r--r--tcg/i386/tcg-target.c218
1 files changed, 122 insertions, 96 deletions
diff --git a/tcg/i386/tcg-target.c b/tcg/i386/tcg-target.c
index 4952c057b3..e45a5a0426 100644
--- a/tcg/i386/tcg-target.c
+++ b/tcg/i386/tcg-target.c
@@ -92,7 +92,6 @@ static const int tcg_target_call_oarg_regs[] = {
#if TCG_TARGET_REG_BITS == 64
# define TCG_REG_L0 tcg_target_call_iarg_regs[0]
# define TCG_REG_L1 tcg_target_call_iarg_regs[1]
-# define TCG_REG_L2 tcg_target_call_iarg_regs[2]
#else
# define TCG_REG_L0 TCG_REG_EAX
# define TCG_REG_L1 TCG_REG_EDX
@@ -181,14 +180,11 @@ static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str)
ct->ct |= TCG_CT_REG;
#if TCG_TARGET_REG_BITS == 64
tcg_regset_set32(ct->u.regs, 0, 0xffff);
- tcg_regset_reset_reg(ct->u.regs, TCG_REG_L0);
- tcg_regset_reset_reg(ct->u.regs, TCG_REG_L1);
- tcg_regset_reset_reg(ct->u.regs, TCG_REG_L2);
#else
tcg_regset_set32(ct->u.regs, 0, 0xff);
- tcg_regset_reset_reg(ct->u.regs, TCG_REG_L0);
- tcg_regset_reset_reg(ct->u.regs, TCG_REG_L1);
#endif
+ tcg_regset_reset_reg(ct->u.regs, TCG_REG_L0);
+ tcg_regset_reset_reg(ct->u.regs, TCG_REG_L1);
break;
case 'e':
@@ -236,11 +232,13 @@ static inline int tcg_target_const_match(tcg_target_long val,
# 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 */
#else
# define P_ADDR32 0
# define P_REXW 0
# define P_REXB_R 0
# define P_REXB_RM 0
+# define P_GS 0
#endif
#define OPC_ARITH_EvIz (0x81)
@@ -356,6 +354,9 @@ static void tcg_out_opc(TCGContext *s, int opc, int r, int rm, int x)
{
int rex;
+ if (opc & P_GS) {
+ tcg_out8(s, 0x65);
+ }
if (opc & P_DATA16) {
/* We should never be asking for both 16 and 64-bit operation. */
assert((opc & P_REXW) == 0);
@@ -1016,12 +1017,12 @@ static const void *qemu_st_helpers[4] = {
LABEL_PTRS is filled with 1 (32-bit addresses) or 2 (64-bit addresses)
positions of the displacements of forward jumps to the TLB miss case.
- First argument register is loaded with the low part of the address.
+ Second argument register is loaded with the low part of the address.
In the TLB hit case, it has been adjusted as indicated by the TLB
and so is a host address. In the TLB miss case, it continues to
hold a guest address.
- Second argument register is clobbered. */
+ First argument register is clobbered. */
static inline void tcg_out_tlb_load(TCGContext *s, int addrlo_idx,
int mem_index, int s_bits,
@@ -1039,25 +1040,25 @@ static inline void tcg_out_tlb_load(TCGContext *s, int addrlo_idx,
rexw = P_REXW;
}
- tcg_out_mov(s, type, r1, addrlo);
tcg_out_mov(s, type, r0, addrlo);
+ tcg_out_mov(s, type, r1, addrlo);
- tcg_out_shifti(s, SHIFT_SHR + rexw, r1,
+ tcg_out_shifti(s, SHIFT_SHR + rexw, r0,
TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS);
- tgen_arithi(s, ARITH_AND + rexw, r0,
- TARGET_PAGE_MASK | ((1 << s_bits) - 1), 0);
tgen_arithi(s, ARITH_AND + rexw, r1,
+ TARGET_PAGE_MASK | ((1 << s_bits) - 1), 0);
+ tgen_arithi(s, ARITH_AND + rexw, r0,
(CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS, 0);
- tcg_out_modrm_sib_offset(s, OPC_LEA + P_REXW, r1, TCG_AREG0, r1, 0,
+ tcg_out_modrm_sib_offset(s, OPC_LEA + P_REXW, r0, TCG_AREG0, r0, 0,
offsetof(CPUArchState, tlb_table[mem_index][0])
+ which);
- /* cmp 0(r1), r0 */
- tcg_out_modrm_offset(s, OPC_CMP_GvEv + rexw, r0, r1, 0);
+ /* cmp 0(r0), r1 */
+ tcg_out_modrm_offset(s, OPC_CMP_GvEv + rexw, r1, r0, 0);
- tcg_out_mov(s, type, r0, addrlo);
+ tcg_out_mov(s, type, r1, addrlo);
/* jne label1 */
tcg_out8(s, OPC_JCC_short + JCC_JNE);
@@ -1065,8 +1066,8 @@ static inline void tcg_out_tlb_load(TCGContext *s, int addrlo_idx,
s->code_ptr++;
if (TARGET_LONG_BITS > TCG_TARGET_REG_BITS) {
- /* cmp 4(r1), addrhi */
- tcg_out_modrm_offset(s, OPC_CMP_GvEv, args[addrlo_idx+1], r1, 4);
+ /* cmp 4(r0), addrhi */
+ tcg_out_modrm_offset(s, OPC_CMP_GvEv, args[addrlo_idx+1], r0, 4);
/* jne label1 */
tcg_out8(s, OPC_JCC_short + JCC_JNE);
@@ -1076,14 +1077,31 @@ static inline void tcg_out_tlb_load(TCGContext *s, int addrlo_idx,
/* TLB Hit. */
- /* add addend(r1), r0 */
- tcg_out_modrm_offset(s, OPC_ADD_GvEv + P_REXW, r0, r1,
+ /* add addend(r0), r1 */
+ tcg_out_modrm_offset(s, OPC_ADD_GvEv + P_REXW, r1, r0,
offsetof(CPUTLBEntry, addend) - which);
}
-#endif
+#elif defined(__x86_64__) && defined(__linux__)
+# include <asm/prctl.h>
+# include <sys/prctl.h>
+
+int arch_prctl(int code, unsigned long addr);
+
+static int guest_base_flags;
+static inline void setup_guest_base_seg(void)
+{
+ if (arch_prctl(ARCH_SET_GS, GUEST_BASE) == 0) {
+ guest_base_flags = P_GS;
+ }
+}
+#else
+# define guest_base_flags 0
+static inline void setup_guest_base_seg(void) { }
+#endif /* SOFTMMU */
static void tcg_out_qemu_ld_direct(TCGContext *s, int datalo, int datahi,
- int base, tcg_target_long ofs, int sizeop)
+ int base, tcg_target_long ofs, int seg,
+ int sizeop)
{
#ifdef TARGET_WORDS_BIGENDIAN
const int bswap = 1;
@@ -1092,28 +1110,29 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, int datalo, int datahi,
#endif
switch (sizeop) {
case 0:
- tcg_out_modrm_offset(s, OPC_MOVZBL, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVZBL + seg, datalo, base, ofs);
break;
case 0 | 4:
- tcg_out_modrm_offset(s, OPC_MOVSBL + P_REXW, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVSBL + P_REXW + seg, datalo, base, ofs);
break;
case 1:
- tcg_out_modrm_offset(s, OPC_MOVZWL, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVZWL + seg, datalo, base, ofs);
if (bswap) {
tcg_out_rolw_8(s, datalo);
}
break;
case 1 | 4:
if (bswap) {
- tcg_out_modrm_offset(s, OPC_MOVZWL, datalo, base, ofs);
+ 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, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVSWL + P_REXW + seg,
+ datalo, base, ofs);
}
break;
case 2:
- tcg_out_ld(s, TCG_TYPE_I32, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVL_GvEv + seg, datalo, base, ofs);
if (bswap) {
tcg_out_bswap32(s, datalo);
}
@@ -1121,17 +1140,18 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, int datalo, int datahi,
#if TCG_TARGET_REG_BITS == 64
case 2 | 4:
if (bswap) {
- tcg_out_ld(s, TCG_TYPE_I32, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVL_GvEv + seg, datalo, base, ofs);
tcg_out_bswap32(s, datalo);
tcg_out_ext32s(s, datalo, datalo);
} else {
- tcg_out_modrm_offset(s, OPC_MOVSLQ, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVSLQ + seg, datalo, base, ofs);
}
break;
#endif
case 3:
if (TCG_TARGET_REG_BITS == 64) {
- tcg_out_ld(s, TCG_TYPE_I64, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVL_GvEv + P_REXW + seg,
+ datalo, base, ofs);
if (bswap) {
tcg_out_bswap64(s, datalo);
}
@@ -1142,11 +1162,15 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, int datalo, int datahi,
datahi = t;
}
if (base != datalo) {
- tcg_out_ld(s, TCG_TYPE_I32, datalo, base, ofs);
- tcg_out_ld(s, TCG_TYPE_I32, datahi, base, ofs + 4);
+ 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);
} else {
- tcg_out_ld(s, TCG_TYPE_I32, datahi, base, ofs + 4);
- tcg_out_ld(s, TCG_TYPE_I32, datalo, base, ofs);
+ 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);
}
if (bswap) {
tcg_out_bswap32(s, datalo);
@@ -1169,9 +1193,7 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
int addrlo_idx;
#if defined(CONFIG_SOFTMMU)
int mem_index, s_bits;
-#if TCG_TARGET_REG_BITS == 64
- int arg_idx;
-#else
+#if TCG_TARGET_REG_BITS == 32
int stack_adjust;
#endif
uint8_t *label_ptr[3];
@@ -1192,7 +1214,7 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
label_ptr, offsetof(CPUTLBEntry, addr_read));
/* TLB Hit. */
- tcg_out_qemu_ld_direct(s, data_reg, data_reg2, TCG_REG_L0, 0, opc);
+ tcg_out_qemu_ld_direct(s, data_reg, data_reg2, TCG_REG_L1, 0, 0, opc);
/* jmp label2 */
tcg_out8(s, OPC_JMP_short);
@@ -1220,15 +1242,9 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
tcg_out_push(s, TCG_AREG0);
stack_adjust += 4;
#else
- /* The first argument is already loaded with addrlo. */
- arg_idx = 1;
- tcg_out_movi(s, TCG_TYPE_I32, tcg_target_call_iarg_regs[arg_idx],
- mem_index);
- /* XXX/FIXME: suboptimal */
- tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[3], TCG_REG_L2);
- tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[2], TCG_REG_L1);
- tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[1], TCG_REG_L0);
tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[0], TCG_AREG0);
+ /* The second argument is already loaded with addrlo. */
+ tcg_out_movi(s, TCG_TYPE_I32, tcg_target_call_iarg_regs[2], mem_index);
#endif
tcg_out_calli(s, (tcg_target_long)qemu_ld_helpers[s_bits]);
@@ -1285,29 +1301,31 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
{
int32_t offset = GUEST_BASE;
int base = args[addrlo_idx];
-
- if (TCG_TARGET_REG_BITS == 64) {
- /* ??? We assume all operations have left us with register
- contents that are zero extended. So far this appears to
- be true. If we want to enforce this, we can either do
- an explicit zero-extension here, or (if GUEST_BASE == 0)
- use the ADDR32 prefix. For now, do nothing. */
-
- if (offset != GUEST_BASE) {
- tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_L0, GUEST_BASE);
- tgen_arithr(s, ARITH_ADD + P_REXW, TCG_REG_L0, base);
- base = TCG_REG_L0;
- offset = 0;
- }
+ int seg = 0;
+
+ /* ??? We assume all operations have left us with register contents
+ that are zero extended. So far this appears to be true. If we
+ want to enforce this, we can either do an explicit zero-extension
+ here, or (if GUEST_BASE == 0, or a segment register is in use)
+ use the ADDR32 prefix. For now, do nothing. */
+ if (GUEST_BASE && guest_base_flags) {
+ seg = guest_base_flags;
+ offset = 0;
+ } else if (TCG_TARGET_REG_BITS == 64 && offset != GUEST_BASE) {
+ tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_L1, GUEST_BASE);
+ tgen_arithr(s, ARITH_ADD + P_REXW, TCG_REG_L1, base);
+ base = TCG_REG_L1;
+ offset = 0;
}
- tcg_out_qemu_ld_direct(s, data_reg, data_reg2, base, offset, opc);
+ tcg_out_qemu_ld_direct(s, data_reg, data_reg2, base, offset, seg, opc);
}
#endif
}
static void tcg_out_qemu_st_direct(TCGContext *s, int datalo, int datahi,
- int base, tcg_target_long ofs, int sizeop)
+ int base, tcg_target_long ofs, int seg,
+ int sizeop)
{
#ifdef TARGET_WORDS_BIGENDIAN
const int bswap = 1;
@@ -1317,12 +1335,13 @@ static void tcg_out_qemu_st_direct(TCGContext *s, int datalo, int datahi,
/* ??? 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_L1 is definitely free here. */
- const int scratch = TCG_REG_L1;
+ means that TCG_REG_L0 is definitely free here. */
+ const int scratch = TCG_REG_L0;
switch (sizeop) {
case 0:
- tcg_out_modrm_offset(s, OPC_MOVB_EvGv + P_REXB_R, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVB_EvGv + P_REXB_R + seg,
+ datalo, base, ofs);
break;
case 1:
if (bswap) {
@@ -1330,7 +1349,8 @@ static void tcg_out_qemu_st_direct(TCGContext *s, int datalo, int datahi,
tcg_out_rolw_8(s, scratch);
datalo = scratch;
}
- tcg_out_modrm_offset(s, OPC_MOVL_EvGv + P_DATA16, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVL_EvGv + P_DATA16 + seg,
+ datalo, base, ofs);
break;
case 2:
if (bswap) {
@@ -1338,7 +1358,7 @@ static void tcg_out_qemu_st_direct(TCGContext *s, int datalo, int datahi,
tcg_out_bswap32(s, scratch);
datalo = scratch;
}
- tcg_out_st(s, TCG_TYPE_I32, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVL_EvGv + seg, datalo, base, ofs);
break;
case 3:
if (TCG_TARGET_REG_BITS == 64) {
@@ -1347,17 +1367,18 @@ static void tcg_out_qemu_st_direct(TCGContext *s, int datalo, int datahi,
tcg_out_bswap64(s, scratch);
datalo = scratch;
}
- tcg_out_st(s, TCG_TYPE_I64, datalo, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVL_EvGv + P_REXW + seg,
+ datalo, base, ofs);
} else if (bswap) {
tcg_out_mov(s, TCG_TYPE_I32, scratch, datahi);
tcg_out_bswap32(s, scratch);
- tcg_out_st(s, TCG_TYPE_I32, scratch, base, ofs);
+ tcg_out_modrm_offset(s, OPC_MOVL_EvGv + seg, scratch, base, ofs);
tcg_out_mov(s, TCG_TYPE_I32, scratch, datalo);
tcg_out_bswap32(s, scratch);
- tcg_out_st(s, TCG_TYPE_I32, scratch, base, ofs + 4);
+ tcg_out_modrm_offset(s, OPC_MOVL_EvGv + seg, scratch, base, ofs+4);
} else {
- tcg_out_st(s, TCG_TYPE_I32, datalo, base, ofs);
- tcg_out_st(s, TCG_TYPE_I32, datahi, base, ofs + 4);
+ 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);
}
break;
default:
@@ -1391,7 +1412,7 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
label_ptr, offsetof(CPUTLBEntry, addr_write));
/* TLB Hit. */
- tcg_out_qemu_st_direct(s, data_reg, data_reg2, TCG_REG_L0, 0, opc);
+ tcg_out_qemu_st_direct(s, data_reg, data_reg2, TCG_REG_L1, 0, 0, opc);
/* jmp label2 */
tcg_out8(s, OPC_JMP_short);
@@ -1425,15 +1446,12 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
tcg_out_push(s, TCG_AREG0);
stack_adjust += 4;
#else
+ tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[0], TCG_AREG0);
+ /* The second argument is already loaded with addrlo. */
tcg_out_mov(s, (opc == 3 ? TCG_TYPE_I64 : TCG_TYPE_I32),
- TCG_REG_L1, data_reg);
- tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_L2, mem_index);
+ tcg_target_call_iarg_regs[2], data_reg);
+ tcg_out_movi(s, TCG_TYPE_I32, tcg_target_call_iarg_regs[3], mem_index);
stack_adjust = 0;
- /* XXX/FIXME: suboptimal */
- tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[3], TCG_REG_L2);
- tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[2], TCG_REG_L1);
- tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[1], TCG_REG_L0);
- tcg_out_mov(s, TCG_TYPE_I64, tcg_target_call_iarg_regs[0], TCG_AREG0);
#endif
tcg_out_calli(s, (tcg_target_long)qemu_st_helpers[s_bits]);
@@ -1451,23 +1469,24 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
{
int32_t offset = GUEST_BASE;
int base = args[addrlo_idx];
-
- if (TCG_TARGET_REG_BITS == 64) {
- /* ??? We assume all operations have left us with register
- contents that are zero extended. So far this appears to
- be true. If we want to enforce this, we can either do
- an explicit zero-extension here, or (if GUEST_BASE == 0)
- use the ADDR32 prefix. For now, do nothing. */
-
- if (offset != GUEST_BASE) {
- tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_L0, GUEST_BASE);
- tgen_arithr(s, ARITH_ADD + P_REXW, TCG_REG_L0, base);
- base = TCG_REG_L0;
- offset = 0;
- }
+ int seg = 0;
+
+ /* ??? We assume all operations have left us with register contents
+ that are zero extended. So far this appears to be true. If we
+ want to enforce this, we can either do an explicit zero-extension
+ here, or (if GUEST_BASE == 0, or a segment register is in use)
+ use the ADDR32 prefix. For now, do nothing. */
+ if (GUEST_BASE && guest_base_flags) {
+ seg = guest_base_flags;
+ offset = 0;
+ } else if (TCG_TARGET_REG_BITS == 64 && offset != GUEST_BASE) {
+ tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_L1, GUEST_BASE);
+ tgen_arithr(s, ARITH_ADD + P_REXW, TCG_REG_L1, base);
+ base = TCG_REG_L1;
+ offset = 0;
}
- tcg_out_qemu_st_direct(s, data_reg, data_reg2, base, offset, opc);
+ tcg_out_qemu_st_direct(s, data_reg, data_reg2, base, offset, seg, opc);
}
#endif
}
@@ -2061,6 +2080,13 @@ static void tcg_target_qemu_prologue(TCGContext *s)
tcg_out_pop(s, tcg_target_callee_save_regs[i]);
}
tcg_out_opc(s, OPC_RET, 0, 0, 0);
+
+#if !defined(CONFIG_SOFTMMU)
+ /* Try to set up a segment register to point to GUEST_BASE. */
+ if (GUEST_BASE) {
+ setup_guest_base_seg();
+ }
+#endif
}
static void tcg_target_init(TCGContext *s)
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-01 19:28:27 +0000