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arm64: mm: print file name of faulting vma 

Print out the name of the file associated with the vma that faulted.
This is usually the executable or shared library name. We already print
out the task name, but also printing the library name is useful for
pinpointing bugs to libraries.

Also print the base address and size of the vma, which together with the
PC (printed by __show_regs) gives the offset into the library.

Fault prints now look like:
test[2361]: unhandled level 2 translation fault (11) at 0x00000012, esr 0x92000006, in libfoo.so[ffffa0145000+1000]

This is already done on x86, for more details see commit 03252919b7
("x86: print which shared library/executable faulted in segfault etc.
messages v3").

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.1
Kristina Martsenko 2017-06-09 16:35:54 +01:00 committed by Will Deacon
parent bf396c09c2
commit 83016b2042
1 changed files with 3 additions and 1 deletions
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4
arch/arm64/mm/fault.c
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@ -261,9 +261,11 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr,
if (unhandled_signal(tsk, sig) && show_unhandled_signals_ratelimited()) {
inf = esr_to_fault_info(esr);
pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n",
pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x",
tsk->comm, task_pid_nr(tsk), inf->name, sig,
addr, esr);
print_vma_addr(KERN_CONT ", in ", regs->pc);
pr_cont("\n");
__show_regs(regs);
}