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authorRichard Weinberger <richard@nod.at>2011-05-24 17:13:03 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 08:39:41 -0700
commit3ef6130ab25a9db6627212d2f6859cc7fc0427ed (patch)
tree69a4630dc9ac3bf32625e23f63b877a12b0f5adb /arch
parent4ff4d8d342fe25c4d1106fb0ffdd310a43d0ace0 (diff)
downloadlinux-linaro-stable-3ef6130ab25a9db6627212d2f6859cc7fc0427ed.tar.gz
um: print info about fatal segfaults
Print a short info about fatal segfaults like other archs do. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/um/kernel/trap.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index 637c6505dc00..8c7b8823d1f0 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -113,6 +113,27 @@ out_of_memory:
return 0;
}
+static void show_segv_info(struct uml_pt_regs *regs)
+{
+ struct task_struct *tsk = current;
+ struct faultinfo *fi = UPT_FAULTINFO(regs);
+
+ if (!unhandled_signal(tsk, SIGSEGV))
+ return;
+
+ if (!printk_ratelimit())
+ return;
+
+ printk("%s%s[%d]: segfault at %lx ip %p sp %p error %x",
+ task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
+ tsk->comm, task_pid_nr(tsk), FAULT_ADDRESS(*fi),
+ (void *)UPT_IP(regs), (void *)UPT_SP(regs),
+ fi->error_code);
+
+ print_vma_addr(KERN_CONT " in ", UPT_IP(regs));
+ printk(KERN_CONT "\n");
+}
+
static void bad_segv(struct faultinfo fi, unsigned long ip)
{
struct siginfo si;
@@ -141,6 +162,7 @@ void segv_handler(int sig, struct uml_pt_regs *regs)
struct faultinfo * fi = UPT_FAULTINFO(regs);
if (UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)) {
+ show_segv_info(regs);
bad_segv(*fi, UPT_IP(regs));
return;
}
@@ -202,6 +224,8 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
address, ip);
}
+ show_segv_info(regs);
+
if (err == -EACCES) {
si.si_signo = SIGBUS;
si.si_errno = 0;