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csky: optimize kernel panic print. 

Use STACKTRACE to optimize panic print more pretty and align registers
printing.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
This commit is contained in:
Guo Ren 2018-12-09 17:07:20 +08:00
parent 0ea2dc7cd6
commit 8f4f1639a1
3 changed files with 41 additions and 56 deletions
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59
arch/csky/kernel/dumpstack.c
View File

@ -7,60 +7,39 @@ int kstack_depth_to_print = 48;
void show_trace(unsigned long *stack)
{
unsigned long *endstack;
unsigned long *stack_end;
unsigned long *stack_start;
unsigned long *fp;
unsigned long addr;
int i;
pr_info("Call Trace:\n");
addr = (unsigned long)stack + THREAD_SIZE - 1;
endstack = (unsigned long *)(addr & -THREAD_SIZE);
i = 0;
while (stack + 1 <= endstack) {
addr = *stack++;
/*
* If the address is either in the text segment of the
* kernel, or in the region which contains vmalloc'ed
* memory, it *may* be the address of a calling
* routine; if so, print it so that someone tracing
* down the cause of the crash will be able to figure
* out the call path that was taken.
*/
if (__kernel_text_address(addr)) {
#ifndef CONFIG_KALLSYMS
if (i % 5 == 0)
pr_cont("\n ");
addr = (unsigned long) stack & THREAD_MASK;
stack_start = (unsigned long *) addr;
stack_end = (unsigned long *) (addr + THREAD_SIZE);
fp = stack;
pr_info("\nCall Trace:");
while (fp > stack_start && fp < stack_end) {
#ifdef CONFIG_STACKTRACE
addr = fp[1];
fp = (unsigned long *) fp[0];
#else
addr = *fp++;
#endif
pr_cont(" [<%08lx>] %pS\n", addr, (void *)addr);
i++;
}
if (__kernel_text_address(addr))
pr_cont("\n[<%08lx>] %pS", addr, (void *)addr);
}
pr_cont("\n");
}
void show_stack(struct task_struct *task, unsigned long *stack)
{
unsigned long *p;
unsigned long *endstack;
int i;
if (!stack) {
if (task)
stack = (unsigned long *)task->thread.esp0;
stack = (unsigned long *)thread_saved_fp(task);
else
stack = (unsigned long *)&stack;
}
endstack = (unsigned long *)
(((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE);
pr_info("Stack from %08lx:", (unsigned long)stack);
p = stack;
for (i = 0; i < kstack_depth_to_print; i++) {
if (p + 1 > endstack)
break;
if (i % 8 == 0)
pr_cont("\n ");
pr_cont(" %08lx", *p++);
}
pr_cont("\n");
show_trace(stack);
}

34
arch/csky/kernel/ptrace.c
View File

@ -241,6 +241,7 @@ asmlinkage void syscall_trace(int why, struct pt_regs *regs)
regs->regs[SYSTRACE_SAVENUM] = saved_why;
}
extern void show_stack(struct task_struct *task, unsigned long *stack);
void show_regs(struct pt_regs *fp)
{
unsigned long *sp;
@ -263,35 +264,37 @@ void show_regs(struct pt_regs *fp)
(int) (((unsigned long) current) + 2 * PAGE_SIZE));
}
pr_info("PC: 0x%08lx\n", (long)fp->pc);
pr_info("PC: 0x%08lx (%pS)\n", (long)fp->pc, (void *)fp->pc);
pr_info("LR: 0x%08lx (%pS)\n", (long)fp->lr, (void *)fp->lr);
pr_info("SP: 0x%08lx\n", (long)fp);
pr_info("orig_a0: 0x%08lx\n", fp->orig_a0);
pr_info("PSR: 0x%08lx\n", (long)fp->sr);
pr_info("a0: 0x%08lx a1: 0x%08lx a2: 0x%08lx a3: 0x%08lx\n",
fp->a0, fp->a1, fp->a2, fp->a3);
pr_info(" a0: 0x%08lx a1: 0x%08lx a2: 0x%08lx a3: 0x%08lx\n",
fp->a0, fp->a1, fp->a2, fp->a3);
#if defined(__CSKYABIV2__)
pr_info("r4: 0x%08lx r5: 0x%08lx r6: 0x%08lx r7: 0x%08lx\n",
pr_info(" r4: 0x%08lx r5: 0x%08lx r6: 0x%08lx r7: 0x%08lx\n",
fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
pr_info("r8: 0x%08lx r9: 0x%08lx r10: 0x%08lx r11: 0x%08lx\n",
pr_info(" r8: 0x%08lx r9: 0x%08lx r10: 0x%08lx r11: 0x%08lx\n",
fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
pr_info("r12 0x%08lx r13: 0x%08lx r15: 0x%08lx\n",
pr_info("r12: 0x%08lx r13: 0x%08lx r15: 0x%08lx\n",
fp->regs[8], fp->regs[9], fp->lr);
pr_info("r16:0x%08lx r17: 0x%08lx r18: 0x%08lx r19: 0x%08lx\n",
pr_info("r16: 0x%08lx r17: 0x%08lx r18: 0x%08lx r19: 0x%08lx\n",
fp->exregs[0], fp->exregs[1], fp->exregs[2], fp->exregs[3]);
pr_info("r20 0x%08lx r21: 0x%08lx r22: 0x%08lx r23: 0x%08lx\n",
pr_info("r20: 0x%08lx r21: 0x%08lx r22: 0x%08lx r23: 0x%08lx\n",
fp->exregs[4], fp->exregs[5], fp->exregs[6], fp->exregs[7]);
pr_info("r24 0x%08lx r25: 0x%08lx r26: 0x%08lx r27: 0x%08lx\n",
pr_info("r24: 0x%08lx r25: 0x%08lx r26: 0x%08lx r27: 0x%08lx\n",
fp->exregs[8], fp->exregs[9], fp->exregs[10], fp->exregs[11]);
pr_info("r28 0x%08lx r29: 0x%08lx r30: 0x%08lx tls: 0x%08lx\n",
pr_info("r28: 0x%08lx r29: 0x%08lx r30: 0x%08lx tls: 0x%08lx\n",
fp->exregs[12], fp->exregs[13], fp->exregs[14], fp->tls);
pr_info("hi 0x%08lx lo: 0x%08lx\n",
pr_info(" hi: 0x%08lx lo: 0x%08lx\n",
fp->rhi, fp->rlo);
#else
pr_info("r6: 0x%08lx r7: 0x%08lx r8: 0x%08lx r9: 0x%08lx\n",
pr_info(" r6: 0x%08lx r7: 0x%08lx r8: 0x%08lx r9: 0x%08lx\n",
fp->regs[0], fp->regs[1], fp->regs[2], fp->regs[3]);
pr_info("r10: 0x%08lx r11: 0x%08lx r12: 0x%08lx r13: 0x%08lx\n",
pr_info("r10: 0x%08lx r11: 0x%08lx r12: 0x%08lx r13: 0x%08lx\n",
fp->regs[4], fp->regs[5], fp->regs[6], fp->regs[7]);
pr_info("r14 0x%08lx r1: 0x%08lx r15: 0x%08lx\n",
pr_info("r14: 0x%08lx r1: 0x%08lx r15: 0x%08lx\n",
fp->regs[8], fp->regs[9], fp->lr);
#endif
@ -313,4 +316,7 @@ void show_regs(struct pt_regs *fp)
pr_cont("%08x ", (int) *sp++);
}
pr_cont("\n");
show_stack(NULL, (unsigned long *)fp->regs[4]);
return;
}

4
arch/csky/mm/fault.c
View File

@ -188,8 +188,8 @@ no_context:
* terminate things with extreme prejudice.
*/
bust_spinlocks(1);
pr_alert("Unable to %s at vaddr: %08lx, epc: %08lx\n",
__func__, address, regs->pc);
pr_alert("Unable to handle kernel paging request at virtual "
"address 0x%08lx, pc: 0x%08lx\n", address, regs->pc);
die_if_kernel("Oops", regs, write);
out_of_memory: