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Implement addressing mode 1 ROR immediate

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This commit is contained in:
Jeffrey Pfau 2013-04-27 01:54:57 -07:00
parent 2bc23e7aa2
commit 2fc5474d91
1 changed files with 8 additions and 1 deletions
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9
src/arm/isa-arm.c
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@ -64,7 +64,14 @@ static inline void _shiftASRR(struct ARMCore* cpu, uint32_t opcode) {
static inline void _shiftROR(struct ARMCore* cpu, uint32_t opcode) {
int rm = opcode & 0x0000000F;
int immediate = (opcode & 0x00000F80) >> 7;
ARM_STUB;
if (immediate) {
cpu->shifterOperand = ARM_ROR(cpu->gprs[rm], immediate);
cpu->shifterCarryOut = cpu->gprs[rm] & (1 << (immediate - 1));
} else {
// RRX
cpu->shifterOperand = (cpu->cpsr.c << 31) | (((uint32_t) cpu->gprs[rm]) >> 1);
cpu->shifterCarryOut = cpu->gprs[rm] & 0x00000001;
}
}
static inline void _shiftRORR(struct ARMCore* cpu, uint32_t opcode) {