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3b2: Fix stack bounds checking bug

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This commit is contained in:
Seth Morabito 2018-03-31 18:46:44 -07:00
parent b0ff29781b
commit 557dcc91e9
1 changed files with 2 additions and 8 deletions
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10
3B2/3b2_cpu.c
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@ -2245,9 +2245,8 @@ t_stat sim_instr(void)
break;
case GATE:
cpu_km = TRUE;
abort_context = C_PROCESS_GATE_PCB;
if (R[NUM_SP] < read_w(R[NUM_PCBP] + 12, ACC_AF) ||
R[NUM_SP] >= read_w(R[NUM_PCBP] + 16, ACC_AF)) {
R[NUM_SP] > read_w(R[NUM_PCBP] + 16, ACC_AF)) {
sim_debug(EXECUTE_MSG, &cpu_dev,
"[%08x] STACK OUT OF BOUNDS IN GATE. "
"SP=%08x, R[NUM_PCBP]+12=%08x, "
@ -2909,12 +2908,9 @@ static SIM_INLINE void cpu_on_normal_exception(uint8 isc)
"[%08x] [cpu_on_normal_exception %d] %%sp=%08x abort_context=%d\n",
R[NUM_PC], isc, R[NUM_SP], abort_context);
abort_context = C_PROCESS_GATE_PCB;
cpu_km = TRUE;
if (R[NUM_SP] < read_w(R[NUM_PCBP] + 12, ACC_AF) ||
R[NUM_SP] >= read_w(R[NUM_PCBP] + 16, ACC_AF)) {
R[NUM_SP] > read_w(R[NUM_PCBP] + 16, ACC_AF)) {
sim_debug(EXECUTE_MSG, &cpu_dev,
"[%08x] STACK OUT OF BOUNDS IN EXCEPTION HANDLER. "
"SP=%08x, R[NUM_PCBP]+12=%08x, "
@ -2923,10 +2919,8 @@ static SIM_INLINE void cpu_on_normal_exception(uint8 isc)
R[NUM_SP],
read_w(R[NUM_PCBP] + 12, ACC_AF),
read_w(R[NUM_PCBP] + 16, ACC_AF));
abort_context = C_NONE;
cpu_abort(STACK_EXCEPTION, STACK_BOUND);
}
cpu_km = FALSE;
/* Set context for STACK (FAULT) */