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tcg/arm: bswap arguments in qemu_ld/st if needed 

On big endian targets, data arguments of qemu_ld/st ops have to be
byte swapped. Two temporary registers are needed for qemu_st to do
the bswap. r0 and r1 are used in system mode, do the same in user
mode, which implies reworking the constraints.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2010-04-09 20:52:48 +02:00
parent e854b6d39c
commit 67dcab7327
1 changed files with 173 additions and 83 deletions
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256
tcg/arm/tcg-target.c
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@ -151,57 +151,55 @@ static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str)
break;
case 'r':
#ifndef CONFIG_SOFTMMU
case 'd':
case 'D':
case 'x':
case 'X':
#endif
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
break;
/* qemu_ld address */
case 'l':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
#ifdef CONFIG_SOFTMMU
/* qemu_ld/st inputs (unless 'X', 'd' or 'D') */
case 'x':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
/* r0 and r1 will be overwritten when reading the tlb entry,
so don't use these. */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R0);
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R1);
break;
/* qemu_ld64 data_reg */
case 'd':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
/* r1 is still needed to load data_reg2, so don't use it. */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R1);
break;
/* qemu_ld/st64 data_reg2 */
case 'D':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
/* r0, r1 and optionally r2 will be overwritten by the address
* and the low word of data, so don't use these. */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R0);
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R1);
# if TARGET_LONG_BITS == 64
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R2);
# endif
break;
# if TARGET_LONG_BITS == 64
/* qemu_ld/st addr_reg2 */
case 'X':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
/* r0 will be overwritten by the low word of base, so don't use it. */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R0);
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R1);
break;
# endif
#endif
break;
case 'L':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
#ifdef CONFIG_SOFTMMU
/* r1 is still needed to load data_reg or data_reg2,
so don't use it. */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R1);
#endif
break;
/* qemu_st address & data_reg */
case 's':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
/* r0 and r1 will be overwritten when reading the tlb entry
(softmmu only) and doing the byte swapping, so don't
use these. */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R0);
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R1);
break;
/* qemu_st64 data_reg2 */
case 'S':
ct->ct |= TCG_CT_REG;
tcg_regset_set32(ct->u.regs, 0, (1 << TCG_TARGET_NB_REGS) - 1);
/* r0 and r1 will be overwritten when reading the tlb entry
(softmmu only) and doing the byte swapping, so don't
use these. */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R0);
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R1);
#ifdef CONFIG_SOFTMMU
/* r2 is still needed to load data_reg, so don't use it. */
tcg_regset_reset_reg(ct->u.regs, TCG_REG_R2);
#endif
break;
default:
return -1;
@ -533,6 +531,21 @@ static inline void tcg_out_ext16u(TCGContext *s, int cond,
}
}
static inline void tcg_out_bswap16s(TCGContext *s, int cond, int rd, int rn)
{
if (use_armv6_instructions) {
/* revsh */
tcg_out32(s, 0x06ff0fb0 | (cond << 28) | (rd << 12) | rn);
} else {
tcg_out_dat_reg(s, cond, ARITH_MOV,
TCG_REG_R8, 0, rn, SHIFT_IMM_LSL(24));
tcg_out_dat_reg(s, cond, ARITH_MOV,
TCG_REG_R8, 0, TCG_REG_R8, SHIFT_IMM_ASR(16));
tcg_out_dat_reg(s, cond, ARITH_ORR,
rd, TCG_REG_R8, rn, SHIFT_IMM_LSR(8));
}
}
static inline void tcg_out_bswap16(TCGContext *s, int cond, int rd, int rn)
{
if (use_armv6_instructions) {
@ -912,7 +925,7 @@ static void *qemu_st_helpers[4] = {
static inline void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
{
int addr_reg, data_reg, data_reg2;
int addr_reg, data_reg, data_reg2, bswap;
#ifdef CONFIG_SOFTMMU
int mem_index, s_bits;
# if TARGET_LONG_BITS == 64
@ -921,6 +934,11 @@ static inline void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
uint32_t *label_ptr;
#endif
#ifdef TARGET_WORDS_BIGENDIAN
bswap = 1;
#else
bswap = 0;
#endif
data_reg = *args++;
if (opc == 3)
data_reg2 = *args++;
@ -987,17 +1005,35 @@ static inline void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
break;
case 1:
tcg_out_ld16u_r(s, COND_EQ, data_reg, addr_reg, TCG_REG_R1);
if (bswap) {
tcg_out_bswap16(s, COND_EQ, data_reg, data_reg);
}
break;
case 1 | 4:
tcg_out_ld16s_r(s, COND_EQ, data_reg, addr_reg, TCG_REG_R1);
if (bswap) {
tcg_out_ld16u_r(s, COND_EQ, data_reg, addr_reg, TCG_REG_R1);
tcg_out_bswap16s(s, COND_EQ, data_reg, data_reg);
} else {
tcg_out_ld16s_r(s, COND_EQ, data_reg, addr_reg, TCG_REG_R1);
}
break;
case 2:
default:
tcg_out_ld32_r(s, COND_EQ, data_reg, addr_reg, TCG_REG_R1);
if (bswap) {
tcg_out_bswap32(s, COND_EQ, data_reg, data_reg);
}
break;
case 3:
tcg_out_ld32_rwb(s, COND_EQ, data_reg, TCG_REG_R1, addr_reg);
tcg_out_ld32_12(s, COND_EQ, data_reg2, TCG_REG_R1, 4);
if (bswap) {
tcg_out_ld32_rwb(s, COND_EQ, data_reg2, TCG_REG_R1, addr_reg);
tcg_out_ld32_12(s, COND_EQ, data_reg, TCG_REG_R1, 4);
tcg_out_bswap32(s, COND_EQ, data_reg2, data_reg2);
tcg_out_bswap32(s, COND_EQ, data_reg, data_reg);
} else {
tcg_out_ld32_rwb(s, COND_EQ, data_reg, TCG_REG_R1, addr_reg);
tcg_out_ld32_12(s, COND_EQ, data_reg2, TCG_REG_R1, 4);
}
break;
}
@ -1075,23 +1111,38 @@ static inline void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
break;
case 1:
tcg_out_ld16u_8(s, COND_AL, data_reg, addr_reg, 0);
if (bswap) {
tcg_out_bswap16(s, COND_AL, data_reg, data_reg);
}
break;
case 1 | 4:
tcg_out_ld16s_8(s, COND_AL, data_reg, addr_reg, 0);
if (bswap) {
tcg_out_ld16u_8(s, COND_AL, data_reg, addr_reg, 0);
tcg_out_bswap16s(s, COND_AL, data_reg, data_reg);
} else {
tcg_out_ld16s_8(s, COND_AL, data_reg, addr_reg, 0);
}
break;
case 2:
default:
tcg_out_ld32_12(s, COND_AL, data_reg, addr_reg, 0);
if (bswap) {
tcg_out_bswap32(s, COND_AL, data_reg, data_reg);
}
break;
case 3:
/* TODO: use block load -
* check that data_reg2 > data_reg or the other way */
if (data_reg == addr_reg) {
tcg_out_ld32_12(s, COND_AL, data_reg2, addr_reg, 4);
tcg_out_ld32_12(s, COND_AL, data_reg, addr_reg, 0);
tcg_out_ld32_12(s, COND_AL, data_reg2, addr_reg, bswap ? 0 : 4);
tcg_out_ld32_12(s, COND_AL, data_reg, addr_reg, bswap ? 4 : 0);
} else {
tcg_out_ld32_12(s, COND_AL, data_reg, addr_reg, 0);
tcg_out_ld32_12(s, COND_AL, data_reg2, addr_reg, 4);
tcg_out_ld32_12(s, COND_AL, data_reg, addr_reg, bswap ? 4 : 0);
tcg_out_ld32_12(s, COND_AL, data_reg2, addr_reg, bswap ? 0 : 4);
}
if (bswap) {
tcg_out_bswap32(s, COND_AL, data_reg, data_reg);
tcg_out_bswap32(s, COND_AL, data_reg2, data_reg2);
}
break;
}
@ -1100,7 +1151,7 @@ static inline void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
static inline void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
{
int addr_reg, data_reg, data_reg2;
int addr_reg, data_reg, data_reg2, bswap;
#ifdef CONFIG_SOFTMMU
int mem_index, s_bits;
# if TARGET_LONG_BITS == 64
@ -1109,6 +1160,11 @@ static inline void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
uint32_t *label_ptr;
#endif
#ifdef TARGET_WORDS_BIGENDIAN
bswap = 1;
#else
bswap = 0;
#endif
data_reg = *args++;
if (opc == 3)
data_reg2 = *args++;
@ -1168,15 +1224,32 @@ static inline void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
tcg_out_st8_r(s, COND_EQ, data_reg, addr_reg, TCG_REG_R1);
break;
case 1:
tcg_out_st16_r(s, COND_EQ, data_reg, addr_reg, TCG_REG_R1);
if (bswap) {
tcg_out_bswap16(s, COND_EQ, TCG_REG_R0, data_reg);
tcg_out_st16_r(s, COND_EQ, TCG_REG_R0, addr_reg, TCG_REG_R1);
} else {
tcg_out_st16_r(s, COND_EQ, data_reg, addr_reg, TCG_REG_R1);
}
break;
case 2:
default:
tcg_out_st32_r(s, COND_EQ, data_reg, addr_reg, TCG_REG_R1);
if (bswap) {
tcg_out_bswap32(s, COND_EQ, TCG_REG_R0, data_reg);
tcg_out_st32_r(s, COND_EQ, TCG_REG_R0, addr_reg, TCG_REG_R1);
} else {
tcg_out_st32_r(s, COND_EQ, data_reg, addr_reg, TCG_REG_R1);
}
break;
case 3:
tcg_out_st32_rwb(s, COND_EQ, data_reg, TCG_REG_R1, addr_reg);
tcg_out_st32_12(s, COND_EQ, data_reg2, TCG_REG_R1, 4);
if (bswap) {
tcg_out_bswap32(s, COND_EQ, TCG_REG_R0, data_reg2);
tcg_out_st32_rwb(s, COND_EQ, TCG_REG_R0, TCG_REG_R1, addr_reg);
tcg_out_bswap32(s, COND_EQ, TCG_REG_R0, data_reg);
tcg_out_st32_12(s, COND_EQ, data_reg, TCG_REG_R1, 4);
} else {
tcg_out_st32_rwb(s, COND_EQ, data_reg, TCG_REG_R1, addr_reg);
tcg_out_st32_12(s, COND_EQ, data_reg2, TCG_REG_R1, 4);
}
break;
}
@ -1271,9 +1344,9 @@ static inline void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
i = ctz32(offset) & ~1;
rot = ((32 - i) << 7) & 0xf00;
tcg_out_dat_imm(s, COND_AL, ARITH_ADD, TCG_REG_R8, addr_reg,
tcg_out_dat_imm(s, COND_AL, ARITH_ADD, TCG_REG_R1, addr_reg,
((offset >> i) & 0xff) | rot);
addr_reg = TCG_REG_R8;
addr_reg = TCG_REG_R1;
offset &= ~(0xff << i);
}
}
@ -1282,17 +1355,34 @@ static inline void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
tcg_out_st8_12(s, COND_AL, data_reg, addr_reg, 0);
break;
case 1:
tcg_out_st16_8(s, COND_AL, data_reg, addr_reg, 0);
if (bswap) {
tcg_out_bswap16(s, COND_AL, TCG_REG_R0, data_reg);
tcg_out_st16_8(s, COND_AL, TCG_REG_R0, addr_reg, 0);
} else {
tcg_out_st16_8(s, COND_AL, data_reg, addr_reg, 0);
}
break;
case 2:
default:
tcg_out_st32_12(s, COND_AL, data_reg, addr_reg, 0);
if (bswap) {
tcg_out_bswap32(s, COND_AL, TCG_REG_R0, data_reg);
tcg_out_st32_12(s, COND_AL, TCG_REG_R0, addr_reg, 0);
} else {
tcg_out_st32_12(s, COND_AL, data_reg, addr_reg, 0);
}
break;
case 3:
/* TODO: use block store -
* check that data_reg2 > data_reg or the other way */
tcg_out_st32_12(s, COND_AL, data_reg, addr_reg, 0);
tcg_out_st32_12(s, COND_AL, data_reg2, addr_reg, 4);
if (bswap) {
tcg_out_bswap32(s, COND_AL, TCG_REG_R0, data_reg2);
tcg_out_st32_12(s, COND_AL, TCG_REG_R0, addr_reg, 0);
tcg_out_bswap32(s, COND_AL, TCG_REG_R0, data_reg);
tcg_out_st32_12(s, COND_AL, TCG_REG_R0, addr_reg, 4);
} else {
tcg_out_st32_12(s, COND_AL, data_reg, addr_reg, 0);
tcg_out_st32_12(s, COND_AL, data_reg2, addr_reg, 4);
}
break;
}
#endif
@ -1637,29 +1727,29 @@ static const TCGTargetOpDef arm_op_defs[] = {
{ INDEX_op_setcond2_i32, { "r", "r", "r", "r", "r" } },
#if TARGET_LONG_BITS == 32
{ INDEX_op_qemu_ld8u, { "r", "x" } },
{ INDEX_op_qemu_ld8s, { "r", "x" } },
{ INDEX_op_qemu_ld16u, { "r", "x" } },
{ INDEX_op_qemu_ld16s, { "r", "x" } },
{ INDEX_op_qemu_ld32, { "r", "x" } },
{ INDEX_op_qemu_ld64, { "d", "r", "x" } },
{ INDEX_op_qemu_ld8u, { "r", "l" } },
{ INDEX_op_qemu_ld8s, { "r", "l" } },
{ INDEX_op_qemu_ld16u, { "r", "l" } },
{ INDEX_op_qemu_ld16s, { "r", "l" } },
{ INDEX_op_qemu_ld32, { "r", "l" } },
{ INDEX_op_qemu_ld64, { "L", "L", "l" } },
{ INDEX_op_qemu_st8, { "x", "x" } },
{ INDEX_op_qemu_st16, { "x", "x" } },
{ INDEX_op_qemu_st32, { "x", "x" } },
{ INDEX_op_qemu_st64, { "x", "D", "x" } },
{ INDEX_op_qemu_st8, { "s", "s" } },
{ INDEX_op_qemu_st16, { "s", "s" } },
{ INDEX_op_qemu_st32, { "s", "s" } },
{ INDEX_op_qemu_st64, { "s", "S", "s" } },
#else
{ INDEX_op_qemu_ld8u, { "r", "x", "X" } },
{ INDEX_op_qemu_ld8s, { "r", "x", "X" } },
{ INDEX_op_qemu_ld16u, { "r", "x", "X" } },
{ INDEX_op_qemu_ld16s, { "r", "x", "X" } },
{ INDEX_op_qemu_ld32, { "r", "x", "X" } },
{ INDEX_op_qemu_ld64, { "d", "r", "x", "X" } },
{ INDEX_op_qemu_ld8u, { "r", "l", "l" } },
{ INDEX_op_qemu_ld8s, { "r", "l", "l" } },
{ INDEX_op_qemu_ld16u, { "r", "l", "l" } },
{ INDEX_op_qemu_ld16s, { "r", "l", "l" } },
{ INDEX_op_qemu_ld32, { "r", "l", "l" } },
{ INDEX_op_qemu_ld64, { "L", "L", "l", "l" } },
{ INDEX_op_qemu_st8, { "x", "x", "X" } },
{ INDEX_op_qemu_st16, { "x", "x", "X" } },
{ INDEX_op_qemu_st32, { "x", "x", "X" } },
{ INDEX_op_qemu_st64, { "x", "D", "x", "X" } },
{ INDEX_op_qemu_st8, { "s", "s", "s" } },
{ INDEX_op_qemu_st16, { "s", "s", "s" } },
{ INDEX_op_qemu_st32, { "s", "s", "s" } },
{ INDEX_op_qemu_st64, { "s", "S", "s", "s" } },
#endif
{ INDEX_op_bswap16_i32, { "r", "r" } },