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tcg/arm: Support host code being compiled for Thumb

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Although the TCG generated code is always in ARM mode, it is possible
that the host code was compiled by gcc in Thumb mode (this is often the
default for Linux distributions targeting ARM v7 only). Handle this
by using BLX imm when doing a call from ARM into Thumb mode.
Since BLX imm is not a conditionalisable instruction, we make
tcg_out_call() no longer take a condition code; we were only ever
using it with COND_AL anyway.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>
This commit is contained in:
Peter Maydell 2011-03-16 15:21:31 +00:00 committed by Andrzej Zaborowski
parent 4ac8e585c8
commit 24e838b787
1 changed files with 26 additions and 9 deletions
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35
tcg/arm/tcg-target.c
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@ -375,6 +375,12 @@ static inline void tcg_out_blx(TCGContext *s, int cond, int rn)
tcg_out32(s, (cond << 28) | 0x012fff30 | rn);
}
static inline void tcg_out_blx_imm(TCGContext *s, int32_t offset)
{
tcg_out32(s, 0xfa000000 | ((offset & 2) << 23) |
(((offset - 8) >> 2) & 0x00ffffff));
}
static inline void tcg_out_dat_reg(TCGContext *s,
int cond, int opc, int rd, int rn, int rm, int shift)
{
@ -840,6 +846,11 @@ static inline void tcg_out_goto(TCGContext *s, int cond, uint32_t addr)
{
int32_t val;
if (addr & 1) {
/* goto to a Thumb destination isn't supported */
tcg_abort();
}
val = addr - (tcg_target_long) s->code_ptr;
if (val - 8 < 0x01fffffd && val - 8 > -0x01fffffd)
tcg_out_b(s, cond, val);
@ -860,14 +871,22 @@ static inline void tcg_out_goto(TCGContext *s, int cond, uint32_t addr)
}
}
static inline void tcg_out_call(TCGContext *s, int cond, uint32_t addr)
static inline void tcg_out_call(TCGContext *s, uint32_t addr)
{
int32_t val;
val = addr - (tcg_target_long) s->code_ptr;
if (val < 0x01fffffd && val > -0x01fffffd)
tcg_out_bl(s, cond, val);
else {
if (val - 8 < 0x02000000 && val - 8 >= -0x02000000) {
if (addr & 1) {
/* Use BLX if the target is in Thumb mode */
if (!use_armv5_instructions) {
tcg_abort();
}
tcg_out_blx_imm(s, val);
} else {
tcg_out_bl(s, COND_AL, val);
}
} else {
#if 1
tcg_abort();
#else
@ -1063,8 +1082,7 @@ static inline void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
TCG_REG_R1, 0, addr_reg2, SHIFT_IMM_LSL(0));
tcg_out_dat_imm(s, COND_AL, ARITH_MOV, TCG_REG_R2, 0, mem_index);
# endif
tcg_out_bl(s, COND_AL, (tcg_target_long) qemu_ld_helpers[s_bits] -
(tcg_target_long) s->code_ptr);
tcg_out_call(s, (tcg_target_long) qemu_ld_helpers[s_bits]);
switch (opc) {
case 0 | 4:
@ -1330,8 +1348,7 @@ static inline void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, int opc)
}
# endif
tcg_out_bl(s, COND_AL, (tcg_target_long) qemu_st_helpers[s_bits] -
(tcg_target_long) s->code_ptr);
tcg_out_call(s, (tcg_target_long) qemu_st_helpers[s_bits]);
if (opc == 3)
tcg_out_dat_imm(s, COND_AL, ARITH_ADD, TCG_REG_R13, TCG_REG_R13, 0x10);
@ -1443,7 +1460,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
break;
case INDEX_op_call:
if (const_args[0])
tcg_out_call(s, COND_AL, args[0]);
tcg_out_call(s, args[0]);
else
tcg_out_callr(s, COND_AL, args[0]);
break;