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parisc: Report trap type as human readable string

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When faulting on some trap, the kernel currently reports in dmesg:

 do_page_fault() command='perl' type=6 address=0xbe400403 in libcrypt-2.24.so[f9086000+9000]
 vm_start = 0x00922000, vm_end = 0x00aed000

With this change the trap type additionally gets reported as human readable
string which makes it simpler to recognize the type of problem:

 do_page_fault() command='perl' type=6 address=0xbe400403 in libcrypt-2.24.so[f9086000+9000]
 trap #6: Instruction TLB miss fault, vm_start = 0x00922000, vm_end = 0x00aed000

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2016-09-24 21:45:46 +02:00
parent 910a86435d
commit b391667eb4
1 changed files with 47 additions and 1 deletions
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48
arch/parisc/mm/fault.c
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@ -167,6 +167,43 @@ int fixup_exception(struct pt_regs *regs)
return 0; return 0;
} }
/*
* parisc hardware trap list
*
* Documented in section 3 "Addressing and Access Control" of the
* "PA-RISC 1.1 Architecture and Instruction Set Reference Manual"
* https://parisc.wiki.kernel.org/index.php/File:Pa11_acd.pdf
*
* For implementation see handle_interruption() in traps.c
*/
static const char * const trap_description[] = {
[1] "High-priority machine check (HPMC)",
[2] "Power failure interrupt",
[3] "Recovery counter trap",
[5] "Low-priority machine check",
[6] "Instruction TLB miss fault",
[7] "Instruction access rights / protection trap",
[8] "Illegal instruction trap",
[9] "Break instruction trap",
[10] "Privileged operation trap",
[11] "Privileged register trap",
[12] "Overflow trap",
[13] "Conditional trap",
[14] "FP Assist Exception trap",
[15] "Data TLB miss fault",
[16] "Non-access ITLB miss fault",
[17] "Non-access DTLB miss fault",
[18] "Data memory protection/unaligned access trap",
[19] "Data memory break trap",
[20] "TLB dirty bit trap",
[21] "Page reference trap",
[22] "Assist emulation trap",
[25] "Taken branch trap",
[26] "Data memory access rights trap",
[27] "Data memory protection ID trap",
[28] "Unaligned data reference trap",
};
/* /*
* Print out info about fatal segfaults, if the show_unhandled_signals * Print out info about fatal segfaults, if the show_unhandled_signals
* sysctl is set: * sysctl is set:
@ -176,6 +213,8 @@ show_signal_msg(struct pt_regs *regs, unsigned long code,
unsigned long address, struct task_struct *tsk, unsigned long address, struct task_struct *tsk,
struct vm_area_struct *vma) struct vm_area_struct *vma)
{ {
const char *trap_name = NULL;
if (!unhandled_signal(tsk, SIGSEGV)) if (!unhandled_signal(tsk, SIGSEGV))
return; return;
@ -186,8 +225,15 @@ show_signal_msg(struct pt_regs *regs, unsigned long code,
pr_warn("do_page_fault() command='%s' type=%lu address=0x%08lx", pr_warn("do_page_fault() command='%s' type=%lu address=0x%08lx",
tsk->comm, code, address); tsk->comm, code, address);
print_vma_addr(KERN_CONT " in ", regs->iaoq[0]); print_vma_addr(KERN_CONT " in ", regs->iaoq[0]);
if (code < ARRAY_SIZE(trap_description))
trap_name = trap_description[code];
pr_warn(KERN_CONT " trap #%lu: %s%c", code,
trap_name ? trap_name : "unknown",
vma ? ',':'\n');
if (vma) if (vma)
pr_warn(" vm_start = 0x%08lx, vm_end = 0x%08lx\n", pr_warn(KERN_CONT " vm_start = 0x%08lx, vm_end = 0x%08lx\n",
vma->vm_start, vma->vm_end); vma->vm_start, vma->vm_end);
show_regs(regs); show_regs(regs);