diff options
Diffstat (limited to 'sim/mn10300/simops.c')
| -rw-r--r-- | sim/mn10300/simops.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/sim/mn10300/simops.c b/sim/mn10300/simops.c index 3d82952..9a3f3a3 100644 --- a/sim/mn10300/simops.c +++ b/sim/mn10300/simops.c @@ -2586,8 +2586,10 @@ void OP_CD000000 (insn, extension) sp -= 4; } - /* Update the stack pointer. */ - State.regs[REG_SP] = sp - extension; + /* Update the stack pointer, note that the register saves to do not + modify SP. The SP adjustment is derived totally from the imm8 + field. */ + State.regs[REG_SP] -= extension; State.regs[REG_MDR] = next_pc; State.regs[REG_PC] += SEXT16 ((insn & 0xffff00) >> 8) - 5; } @@ -2651,8 +2653,10 @@ void OP_DD000000 (insn, extension) sp -= 4; } - /* Update the stack pointer. */ - State.regs[REG_SP] = sp - (extension & 0xff); + /* Update the stack pointer, note that the register saves to do not + modify SP. The SP adjustment is derived totally from the imm8 + field. */ + State.regs[REG_SP] -= (extension & 0xff); State.regs[REG_MDR] = next_pc; State.regs[REG_PC] += (((insn & 0xffffff) << 8) | ((extension & 0xff0000) >> 16)) - 7; } |