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Use bx instead of mov for jumps on ARM

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Icecream95 2020-04-09 21:24:51 +12:00
parent 7f5f26269f
commit a6fee1add8
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GPG key ID: 339D18472C107D93
1 changed files with 2 additions and 3 deletions
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5
lightening/arm-cpu.c
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@ -2066,7 +2066,7 @@ rshi_u(jit_state_t *_jit, int32_t r0, int32_t r1, jit_word_t i0)
static void
jmpr(jit_state_t *_jit, int32_t r0)
{
T1_MOV(_jit, jit_gpr_regno(_PC), r0);
T1_BX(_jit, r0);
}
static jit_reloc_t
@ -3022,11 +3022,10 @@ emit_veneer(jit_state_t *_jit, jit_pointer_t target)
{
uint16_t thumb1_ldr = 0x4800;
int32_t tmp = jit_gpr_regno(JIT_TMP1);
int32_t rd = jit_gpr_regno(_PC);
ASSERT(tmp < 8);
// Loaded addr is 4 bytes after the LDR, which is aligned, so offset is 0.
emit_u16(_jit, thumb1_ldr | (tmp << 8));
emit_u16(_jit, THUMB_MOV|((_u4(rd)&8)<<4)|(_u4(tmp)<<3)|(rd&7));
emit_u16(_jit, THUMB_BX|(_u4(tmp)<<3));
emit_u32(_jit, (uint32_t) target);
}