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authorHelge Deller <deller@gmx.de>2016-09-24 21:45:46 +0200
committerHelge Deller <deller@gmx.de>2016-09-24 21:45:46 +0200
commitb391667eb45a5a888bc9372462c5f647418c31af (patch)
tree9ff484ba4e08da9f261fccd22d1cf3767f8ad036 /arch/parisc/mm/fault.c
parentparisc: Update comment regarding implementation of copy_user_page_asm (diff)
downloadlinux-dev-b391667eb45a5a888bc9372462c5f647418c31af.tar.xz
linux-dev-b391667eb45a5a888bc9372462c5f647418c31af.zip
parisc: Report trap type as human readable string
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>
Diffstat (limited to '')
-rw-r--r--arch/parisc/mm/fault.c48
1 files changed, 47 insertions, 1 deletions
diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c
index 163af2c31d76..47a6ca4c9e40 100644
--- a/arch/parisc/mm/fault.c
+++ b/arch/parisc/mm/fault.c
@@ -168,6 +168,43 @@ int fixup_exception(struct pt_regs *regs)
}
/*
+ * 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
* sysctl is set:
*/
@@ -176,6 +213,8 @@ show_signal_msg(struct pt_regs *regs, unsigned long code,
unsigned long address, struct task_struct *tsk,
struct vm_area_struct *vma)
{
+ const char *trap_name = NULL;
+
if (!unhandled_signal(tsk, SIGSEGV))
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",
tsk->comm, code, address);
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)
- 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);
show_regs(regs);