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Implement BX

This commit is contained in:
Jeffrey Pfau 2013-04-14 02:55:12 -07:00
parent d7ff6aa14b
commit 7c8d76eb06
1 changed files with 14 additions and 1 deletions
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15
src/isa-thumb.c
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@ -390,7 +390,20 @@ DEFINE_INSTRUCTION_THUMB(BL2, \
cpu->gprs[ARM_LR] = pc - 1; \
THUMB_WRITE_PC;)
DEFINE_INSTRUCTION_THUMB(BX, ARM_STUB)
DEFINE_INSTRUCTION_THUMB(BX, \
int rm = opcode & 0x0000000F; \
_ARMSetMode(cpu, cpu->gprs[rm] & 0x00000001);
int misalign = 0;
if (rm == ARM_PC) {
misalign = cpu->gprs[rm] & 0x00000002;
}
cpu->gprs[ARM_PC] = cpu->gprs[rm] & 0xFFFFFFFE - misalign; \
if (cpu->executionMode == MODE_THUMB) { \
THUMB_WRITE_PC; \
} else { \
ARM_WRITE_PC; \
})
DEFINE_INSTRUCTION_THUMB(SWI, ARM_STUB)
#define DECLARE_INSTRUCTION_THUMB(EMITTER, NAME) \