* from on to another using kdb_on! #cpu or cpu #cpu
*/
-decl_simple_lock_data(, debugger_lock) /* debugger lock */
+hw_lock_data_t debugger_lock; /* debugger lock */
+hw_lock_data_t pbtlock; /* backtrace print lock */
int debugger_cpu = -1; /* current cpu running debugger */
int debugger_debug = 0; /* Debug debugger */
unsigned int debugger_sync = 0; /* Cross processor debugger entry sync */
extern unsigned int NMIss; /* NMI debounce switch */
+extern volatile int panicwait;
+volatile unsigned int pbtcnt = 0;
+volatile unsigned int pbtcpu = -1;
+
unsigned int lastTrace; /* Value of low-level exception trace controls */
volatile unsigned int cpus_holding_bkpts; /* counter for number of cpus holding
insert back breakpoints) */
void unlock_debugger(void);
void lock_debugger(void);
+void dump_backtrace(unsigned int stackptr, unsigned int fence);
+void dump_savearea(savearea *sv, unsigned int fence);
#if !MACH_KDB
boolean_t db_breakpoints_inserted = TRUE;
boolean_t db_im_stepping = 0xFFFFFFFF; /* Remember if we were stepping */
+
+char *failNames[] = {
+
+ "Debugging trap", /* failDebug */
+ "Corrupt stack", /* failStack */
+ "Corrupt mapping tables", /* failMapping */
+ "Corrupt context", /* failContext */
+ "No saveareas", /* failNoSavearea */
+ "Savearea corruption", /* failSaveareaCorr */
+ "Invalid live context", /* failBadLiveContext */
+ "Unknown failure code" /* Unknown failure code - must always be last */
+};
+
+char *invxcption = "Unknown code";
+
extern const char version[];
+extern char *trap_type[];
+extern vm_offset_t mem_actual;
#if !MACH_KDB
-void kdb_trap(int type, struct ppc_saved_state *regs);
-void kdb_trap(int type, struct ppc_saved_state *regs) {
+void kdb_trap(int type, struct savearea *regs);
+void kdb_trap(int type, struct savearea *regs) {
return;
}
#endif
#if !MACH_KDP
-void kdp_trap(int type, struct ppc_saved_state *regs);
-void kdp_trap(int type, struct ppc_saved_state *regs) {
+void kdp_trap(int type, struct savearea *regs);
+void kdp_trap(int type, struct savearea *regs) {
return;
}
#endif
if (boot_arg & DB_HALT) halt_in_debugger=1;
if (boot_arg & DB_PRT) disableDebugOuput=FALSE;
if (boot_arg & DB_SLOG) systemLogDiags=TRUE;
+ if (boot_arg & DB_NMI) panicDebugging=TRUE;
+ if (boot_arg & DB_LOG_PI_SCRN) logPanicDataToScreen=TRUE;
}
- hw_lock_init(&debugger_lock); /* initialized debugger lock */
+ hw_lock_init(&debugger_lock); /* initialize debugger lock */
+ hw_lock_init(&pbtlock); /* initialize print backtrace lock */
#if MACH_KDB
/*
default_preemption_rate = boot_arg;
}
- if (PE_parse_boot_arg("kpreempt", &boot_arg)) {
- extern int kernel_preemption_mode;
- extern boolean_t zone_gc_allowed;
+ if (PE_parse_boot_arg("unsafe", &boot_arg)) {
+ extern int max_unsafe_quanta;
+
+ max_unsafe_quanta = boot_arg;
+ }
+ if (PE_parse_boot_arg("poll", &boot_arg)) {
+ extern int max_poll_quanta;
- kernel_preemption_mode = boot_arg;
- zone_gc_allowed = FALSE; /* XXX: TO BE REMOVED */
+ max_poll_quanta = boot_arg;
+ }
+ if (PE_parse_boot_arg("yield", &boot_arg)) {
+ extern int sched_poll_yield_shift;
+
+ sched_poll_yield_shift = boot_arg;
}
machine_conf();
void
-print_backtrace(struct ppc_saved_state *ssp)
+print_backtrace(struct savearea *ssp)
{
- unsigned int *stackptr, *raddr, *rstack, trans;
+ unsigned int stackptr, *raddr, *rstack, trans, fence;
int i, frames_cnt, skip_top_frames, frames_max;
unsigned int store[8]; /* Buffer for real storage reads */
vm_offset_t backtrace_entries[32];
+ thread_act_t *act;
+ savearea *sv, *svssp;
+ int cpu;
- printf("backtrace: ");
- frames_cnt =0;
-
- /* Get our stackpointer for backtrace */
- if (ssp==NULL) {
- __asm__ volatile("mr %0, r1" : "=r" (stackptr));
- skip_top_frames = 1;
- } else {
- stackptr = (unsigned int *)(ssp->r1);
- skip_top_frames = 0;
- backtrace_entries[frames_cnt] = ssp->srr0;
- frames_cnt++;
- printf("0x%08x ", ssp->srr0);
- }
+/*
+ * We need this lock to make sure we don't hang up when we double panic on an MP.
+ */
- frames_max = 32-frames_cnt;
- for (i = 0; i < frames_max; i++) {
+ cpu = cpu_number(); /* Just who are we anyways? */
+ if(pbtcpu != cpu) { /* Allow recursion */
+ hw_atomic_add(&pbtcnt, 1); /* Remember we are trying */
+ while(!hw_lock_try(&pbtlock)); /* Spin here until we can get in. If we never do, well, we're crashing anyhow... */
+ pbtcpu = cpu; /* Mark it as us */
+ }
- if(!stackptr) break; /* No more to get... */
+ svssp = (savearea *)ssp; /* Make this easier */
+ sv = 0;
+ if(current_thread()) sv = (savearea *)current_act()->mact.pcb; /* Find most current savearea if system has started */
- /* Avoid causing page fault */
- if (!(raddr = LRA(PPC_SID_KERNEL, (void *)((unsigned int)stackptr+FM_LR_SAVE))))
+ fence = 0xFFFFFFFF; /* Show we go all the way */
+ if(sv) fence = sv->save_r1; /* Stop at previous exception point */
+
+ if(!svssp) { /* Should we start from stack? */
+ kdb_printf("Latest stack backtrace for cpu %d:\n", cpu_number());
+ __asm__ volatile("mr %0,r1" : "=r" (stackptr)); /* Get current stack */
+ dump_backtrace(stackptr, fence); /* Dump the backtrace */
+ if(!sv) { /* Leave if no saveareas */
+ kdb_printf("\nKernel version:\n%s\n",version); /* Print kernel version */
+ hw_lock_unlock(&pbtlock); /* Allow another back trace to happen */
+ return;
+ }
+ }
+ else { /* Were we passed an exception? */
+ fence = 0xFFFFFFFF; /* Show we go all the way */
+ if(svssp->save_hdr.save_prev) {
+ if((svssp->save_hdr.save_prev <= VM_MAX_KERNEL_ADDRESS) && ((unsigned int)LRA(PPC_SID_KERNEL, (void *)svssp->save_hdr.save_prev))) { /* Valid address? */
+ fence = svssp->save_hdr.save_prev->save_r1; /* Stop at previous exception point */
+ }
+ }
+
+ kdb_printf("Latest crash info for cpu %d:\n", cpu_number());
+ kdb_printf(" Exception state (sv=0x%08X)\n", sv);
+ dump_savearea(svssp, fence); /* Dump this savearea */
+ }
+
+ if(!sv) { /* Leave if no saveareas */
+ kdb_printf("\nKernel version:\n%s\n",version); /* Print kernel version */
+ hw_lock_unlock(&pbtlock); /* Allow another back trace to happen */
+ return;
+ }
+
+ kdb_printf("Proceeding back via exception chain:\n");
+
+ while(sv) { /* Do them all... */
+ if(!((sv <= VM_MAX_KERNEL_ADDRESS) && (unsigned int)LRA(PPC_SID_KERNEL, (void *)sv))) { /* Valid address? */
+ kdb_printf(" Exception state (sv=0x%08X) Not mapped or invalid. stopping...\n", sv);
break;
- ReadReal((unsigned int)raddr, &store[0]);
- if (skip_top_frames)
- skip_top_frames--;
+ }
+
+ kdb_printf(" Exception state (sv=0x%08X)\n", sv);
+ if(sv == svssp) { /* Did we dump it already? */
+ kdb_printf(" previously dumped as \"Latest\" state. skipping...\n");
+ }
else {
- backtrace_entries[frames_cnt] = store[0];
- frames_cnt++;
- printf("0x%08x ",store[0]);
+ fence = 0xFFFFFFFF; /* Show we go all the way */
+ if(sv->save_hdr.save_prev) {
+ if((sv->save_hdr.save_prev <= VM_MAX_KERNEL_ADDRESS) && ((unsigned int)LRA(PPC_SID_KERNEL, (void *)sv->save_hdr.save_prev))) { /* Valid address? */
+ fence = sv->save_hdr.save_prev->save_r1; /* Stop at previous exception point */
+ }
+ }
+ dump_savearea(sv, fence); /* Dump this savearea */
+ }
+
+ sv = sv->save_hdr.save_prev; /* Back chain */
+ }
+
+ kdb_printf("\nKernel version:\n%s\n",version); /* Print kernel version */
+
+ pbtcpu = -1; /* Mark as unowned */
+ hw_lock_unlock(&pbtlock); /* Allow another back trace to happen */
+ hw_atomic_sub(&pbtcnt, 1); /* Show we are done */
+
+ while(pbtcnt); /* Wait for completion */
+
+ return;
+}
+
+void dump_savearea(savearea *sv, unsigned int fence) {
+
+ char *xcode;
+
+ if(sv->save_exception > T_MAX) xcode = invxcption; /* Too big for table */
+ else xcode = trap_type[sv->save_exception / 4]; /* Point to the type */
+
+ kdb_printf(" PC=0x%08X; MSR=0x%08X; DAR=0x%08X; DSISR=0x%08X; LR=0x%08X; R1=0x%08X; XCP=0x%08X (%s)\n",
+ sv->save_srr0, sv->save_srr1, sv->save_dar, sv->save_dsisr,
+ sv->save_lr, sv->save_r1, sv->save_exception, xcode);
+
+ if(!(sv->save_srr1 & MASK(MSR_PR))) { /* Are we in the kernel? */
+ dump_backtrace(sv->save_r1, fence); /* Dump the stack back trace from here if not user state */
+ }
+
+ return;
+}
+
+
+
+#define DUMPFRAMES 32
+#define LRindex 2
+
+void dump_backtrace(unsigned int stackptr, unsigned int fence) {
+
+ unsigned int bframes[DUMPFRAMES];
+ unsigned int sframe[8], raddr, dumbo;
+ int i;
+
+ kdb_printf(" Backtrace:\n");
+ for(i = 0; i < DUMPFRAMES; i++) { /* Dump up to max frames */
+
+ if(!stackptr || (stackptr == fence)) break; /* Hit stop point or end... */
+
+ if(stackptr & 0x0000000f) { /* Is stack pointer valid? */
+ kdb_printf("\n backtrace terminated - unaligned frame address: 0x%08X\n", stackptr); /* No, tell 'em */
+ break;
}
- if (!(raddr = LRA(PPC_SID_KERNEL, (void *)stackptr)))
+
+ raddr = (unsigned int)LRA(PPC_SID_KERNEL, (void *)stackptr); /* Get physical frame address */
+ if(!raddr || (stackptr > VM_MAX_KERNEL_ADDRESS)) { /* Is it mapped? */
+ kdb_printf("\n backtrace terminated - frame not mapped or invalid: 0x%08X\n", stackptr); /* No, tell 'em */
break;
- ReadReal((unsigned int)raddr, &store[0]);
- stackptr=(unsigned int *)store[0];
- }
- printf("\n");
+ }
+
+ if(raddr >= mem_actual) { /* Is it within physical RAM? */
+ kdb_printf("\n backtrace terminated - frame outside of RAM: v=0x%08X, p=%08X\n", stackptr, raddr); /* No, tell 'em */
+ break;
+ }
+
+ ReadReal(raddr, &sframe[0]); /* Fetch the stack frame */
- if (frames_cnt)
- kmod_dump((vm_offset_t *)&backtrace_entries[0], frames_cnt);
+ bframes[i] = sframe[LRindex]; /* Save the link register */
+
+ if(!i) kdb_printf(" "); /* Indent first time */
+ else if(!(i & 7)) kdb_printf("\n "); /* Skip to new line every 8 */
+ kdb_printf("0x%08X ", bframes[i]); /* Dump the link register */
+
+ stackptr = sframe[0]; /* Chain back */
+ }
+ kdb_printf("\n");
+ if(i >= DUMPFRAMES) kdb_printf(" backtrace continues...\n"); /* Say we terminated early */
+ if(i) kmod_dump((vm_offset_t *)&bframes[0], i); /* Show what kmods are in trace */
+
}
+
+
void
Debugger(const char *message) {
int i;
unsigned int store[8];
+ unsigned long pi_size = 0;
spl_t spl;
spl = splhigh(); /* No interruptions from here on */
-
+
/*
* backtrace for Debugger() call from panic() if no current debugger
* backtrace and return for double panic() call
print_backtrace(NULL);
if (nestedpanic != 0) {
splx(spl);
- return; /* Yeah, don't enter again... */
+ return; /* Yeah, don't enter again... */
}
}
-
+
if (debug_mode && debugger_active[cpu_number()]) { /* Are we already on debugger on this processor? */
splx(spl);
return; /* Yeah, don't do it again... */
}
+
+/*
+ * The above stuff catches the double panic case so we shouldn't have to worry about that here.
+ */
+ if ( panicstr != (char *)0 )
+ {
+ /* diable kernel preemptions */
+ disable_preemption();
+
+ /* everything should be printed now so copy to NVRAM
+ */
+ if( debug_buf_size > 0)
+ pi_size = PESavePanicInfo( debug_buf, debug_buf_ptr - debug_buf);
+
+ if( !panicDebugging && (pi_size != 0) ) {
+ int my_cpu, debugger_cpu;
+ int tcpu;
+
+ my_cpu = cpu_number();
+ debugger_cpu = my_cpu;
+
+ hw_atomic_add(&debug_mode, 1);
+ debugger_active[my_cpu]++;
+ lock_debugger();
+
+ for(tcpu = 0; tcpu < NCPUS; tcpu++) {
+ if(tcpu == my_cpu) continue;
+ hw_atomic_add(&debugger_sync, 1);
+ (void)cpu_signal(tcpu, SIGPdebug, 0 ,0);
+ }
+ (void)hw_cpu_sync(&debugger_sync, LockTimeOut);
+ debugger_sync = 0;
+ }
+
+ draw_panic_dialog();
+
+ if( !panicDebugging && (pi_size != 0))
+ PEHaltRestart( kPEHangCPU );
+
+ enable_preemption();
+ }
+
+
if ((current_debugger != NO_CUR_DB)) { /* If there is a debugger configured, enter it */
printf("Debugger(%s)\n", message);
TRAP_DEBUGGER;
}
printf("\nNo debugger configured - dumping debug information\n");
- printf("\nversion string : %s\n",version);
- mfdbatu(store[0],0);
- mfdbatl(store[1],0);
- mfdbatu(store[2],1);
- mfdbatl(store[3],1);
- mfdbatu(store[4],2);
- mfdbatl(store[5],2);
- mfdbatu(store[6],3);
- mfdbatl(store[7],3);
- printf("DBAT0: %08X %08X\n", store[0], store[1]);
- printf("DBAT1: %08X %08X\n", store[2], store[3]);
- printf("DBAT2: %08X %08X\n", store[4], store[5]);
- printf("DBAT3: %08X %08X\n", store[6], store[7]);
printf("MSR=%08X\n",mfmsr());
print_backtrace(NULL);
splx(spl);
return;
}
+/*
+ * Here's where we attempt to get some diagnostic information dumped out
+ * when the system is really confused. We will try to get into the
+ * debugger as well.
+ *
+ * We are here with interrupts disabled and on the debug stack. The savearea
+ * that was passed in is NOT chained to the activation.
+ *
+ * save_r3 contains the failure reason code.
+ */
+
+void SysChoked(int type, savearea *sv) { /* The system is bad dead */
+
+ unsigned int failcode;
+
+ mp_disable_preemption();
+ disableDebugOuput = FALSE;
+ debug_mode = TRUE;
+
+ failcode = sv->save_r3; /* Get the failure code */
+ if(failcode > failUnknown) failcode = failUnknown; /* Set unknown code code */
+
+ kprintf("System Failure: cpu=%d; code=%08X (%s)\n", cpu_number(), sv->save_r3, failNames[failcode]);
+ kdb_printf("System Failure: cpu=%d; code=%08X (%s)\n", cpu_number(), sv->save_r3, failNames[failcode]);
+
+ print_backtrace(sv); /* Attempt to print backtrace */
+ Call_DebuggerC(type, sv); /* Attempt to get into debugger */
+
+ if ((current_debugger != NO_CUR_DB)) Call_DebuggerC(type, sv); /* Attempt to get into debugger */
+
+}
+
+
+
/*
* When we get here, interruptions are disabled and we are on the debugger stack
* Never, ever, ever, ever enable interruptions from here on
int Call_DebuggerC(
int type,
- struct ppc_saved_state *saved_state)
+ struct savearea *saved_state)
{
int directcall, wait;
vm_offset_t instr_ptr;
kprintf("Call_DebuggerC(%d): %08X %08X, debact = %d\n", my_cpu, type, saved_state, debug_mode); /* (TEST/DEBUG) */
#endif
printf("Call_Debugger: enter - cpu %d, is_slave %d, debugger_cpu %d, pc %08X\n",
- my_cpu, debugger_is_slave[my_cpu], debugger_cpu, saved_state->srr0);
+ my_cpu, debugger_is_slave[my_cpu], debugger_cpu, saved_state->save_srr0);
}
- if (instr_ptr = (vm_offset_t)LRA(PPC_SID_KERNEL, (void *)(saved_state->srr0))) {
+ if (instr_ptr = (vm_offset_t)LRA(PPC_SID_KERNEL, (void *)(saved_state->save_srr0))) {
instr = ml_phys_read(instr_ptr); /* Get the trap that caused entry */
}
else instr = 0;
switch_debugger = 0; /* Make sure switch request is off */
directcall = 1; /* Assume direct call */
- if (saved_state->srr1 & MASK(SRR1_PRG_TRAP)) { /* Trap instruction? */
+ if (saved_state->save_srr1 & MASK(SRR1_PRG_TRAP)) { /* Trap instruction? */
directcall = 0; /* We had a trap not a direct call */
instr, my_cpu, debugger_cpu, db_run_mode); /* (TEST/DEBUG) */
#endif
if ((instr == TRAP_DEBUGGER_INST) || /* Did we trap to enter debugger? */
- (instr == TRAP_DIRECT_INST)) saved_state->srr0 += TRAP_INST_SIZE; /* Yes, point past trap */
+ (instr == TRAP_DIRECT_INST)) saved_state->save_srr0 += TRAP_INST_SIZE; /* Yes, point past trap */
if(debugger_cpu == my_cpu) LLTraceSet(lastTrace); /* Enable tracing on the way out if we are debugger */
projects / apple / xnu.git / blobdiff