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ARC: Debug/crash-printing Improvements

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* Remove the line-break between scratch/callee-regs (sneaked in when we
  converted from printk to pr_*

* Use %pS to print the symbol names of faulting PC (ret pseudo register)
  and BLINK (call return register)

* Don't print user-vma for a kernel crash (only do it for
  print-fatal-signals based regfile dump)

* Verbose print the Interrupt/Exception Enable/Active state

* for main executable link address is 0x10000 based (vs. 0) thus offset
  of faulting PC needs to be adjusted

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2013-03-22 17:16:49 +05:30
parent 68e4790ec4
commit bd3c8b11ec
1 changed files with 32 additions and 18 deletions
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50
arch/arc/kernel/troubleshoot.c
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@ -26,7 +26,6 @@ static noinline void print_reg_file(long *reg_rev, int start_num)
char buf[512];
int n = 0, len = sizeof(buf);
/* weird loop because pt_regs regs rev r12..r0, r25..r13 */
for (i = start_num; i < start_num + 13; i++) {
n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t",
i, (unsigned long)*reg_rev);
@ -34,13 +33,18 @@ static noinline void print_reg_file(long *reg_rev, int start_num)
if (((i + 1) % 3) == 0)
n += scnprintf(buf + n, len - n, "\n");
/* because pt_regs has regs reversed: r12..r0, r25..r13 */
reg_rev--;
}
if (start_num != 0)
n += scnprintf(buf + n, len - n, "\n\n");
pr_info("%s", buf);
/* To continue printing callee regs on same line as scratch regs */
if (start_num == 0)
pr_info("%s", buf);
else
pr_cont("%s\n", buf);
}
static void show_callee_regs(struct callee_regs *cregs)
@ -83,6 +87,10 @@ static void show_faulting_vma(unsigned long address, char *buf)
dev_t dev = 0;
char *nm = buf;
/* can't use print_vma_addr() yet as it doesn't check for
* non-inclusive vma
*/
vma = find_vma(current->active_mm, address);
/* check against the find_vma( ) behaviour which returns the next VMA
@ -98,10 +106,13 @@ static void show_faulting_vma(unsigned long address, char *buf)
ino = inode->i_ino;
}
pr_info(" @off 0x%lx in [%s]\n"
" VMA: 0x%08lx to 0x%08lx\n\n",
address - vma->vm_start, nm, vma->vm_start, vma->vm_end);
} else
" VMA: 0x%08lx to 0x%08lx\n",
vma->vm_start < TASK_UNMAPPED_BASE ?
address : address - vma->vm_start,
nm, vma->vm_start, vma->vm_end);
} else {
pr_info(" @No matching VMA found\n");
}
}
static void show_ecr_verbose(struct pt_regs *regs)
@ -110,7 +121,7 @@ static void show_ecr_verbose(struct pt_regs *regs)
unsigned long address;
cause_reg = current->thread.cause_code;
pr_info("\n[ECR]: 0x%08x => ", cause_reg);
pr_info("\n[ECR ]: 0x%08x => ", cause_reg);
/* For Data fault, this is data address not instruction addr */
address = current->thread.fault_address;
@ -120,7 +131,7 @@ static void show_ecr_verbose(struct pt_regs *regs)
/* For DTLB Miss or ProtV, display the memory involved too */
if (vec == ECR_V_DTLB_MISS) {
pr_cont("Invalid (%s) @ 0x%08lx by insn @ 0x%08lx\n",
pr_cont("Invalid %s 0x%08lx by insn @ 0x%08lx\n",
(cause_code == 0x01) ? "Read From" :
((cause_code == 0x02) ? "Write to" : "EX"),
address, regs->ret);
@ -167,20 +178,23 @@ void show_regs(struct pt_regs *regs)
if (current->thread.cause_code)
show_ecr_verbose(regs);
pr_info("[EFA]: 0x%08lx\n", current->thread.fault_address);
pr_info("[ERET]: 0x%08lx (PC of Faulting Instr)\n", regs->ret);
pr_info("[EFA ]: 0x%08lx\n[BLINK ]: %pS\n[ERET ]: %pS\n",
current->thread.fault_address,
(void *)regs->blink, (void *)regs->ret);
show_faulting_vma(regs->ret, buf); /* faulting code, not data */
if (user_mode(regs))
show_faulting_vma(regs->ret, buf); /* faulting code, not data */
/* can't use print_vma_addr() yet as it doesn't check for
* non-inclusive vma
*/
pr_info("[STAT32]: 0x%08lx", regs->status32);
/* print special regs */
pr_info("status32: 0x%08lx\n", regs->status32);
pr_info(" SP: 0x%08lx\tFP: 0x%08lx\n", regs->sp, regs->fp);
pr_info("BTA: 0x%08lx\tBLINK: 0x%08lx\n",
regs->bta, regs->blink);
#define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit : ""
if (!user_mode(regs))
pr_cont(" : %2s %2s %2s %2s %2s\n",
STS_BIT(regs, AE), STS_BIT(regs, A2), STS_BIT(regs, A1),
STS_BIT(regs, E2), STS_BIT(regs, E1));
pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n",
regs->bta, regs->sp, regs->fp);
pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
regs->lp_start, regs->lp_end, regs->lp_count);