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authorPaul Mackerras <paulus@samba.org>2005-09-10 21:13:11 +1000
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-10 10:15:11 -0700
commitbb0bb3b6596cdb08adb0b72453cc67d48e139c2c (patch)
treef9116ed650d499d405a3fe021c473f9558897d96 /include/asm-ppc/system.h
parent1e63bc7342c40f0f1dd83d80d368665bd06f4963 (diff)
[PATCH] ppc32: Kill init on unhandled synchronous signals
This is a patch that I have had in my tree for ages. If init causes an exception that raises a signal, such as a SIGSEGV, SIGILL or SIGFPE, and it hasn't registered a handler for it, we don't deliver the signal, since init doesn't get any signals that it doesn't have a handler for. But that means that we just return to userland and generate the same exception again immediately. With this patch we print a message and kill init in this situation. This is very useful when you have a bug in the kernel that means that init doesn't get as far as executing its first instruction. :) Without this patch the system hangs when it gets to starting the userland init; with it you at least get a message giving you a clue about what has gone wrong. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-ppc/system.h')
-rw-r--r--include/asm-ppc/system.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-ppc/system.h b/include/asm-ppc/system.h
index 513a334c581..d754ab570fe 100644
--- a/include/asm-ppc/system.h
+++ b/include/asm-ppc/system.h
@@ -88,6 +88,7 @@ extern void *cacheable_memcpy(void *, const void *, unsigned int);
extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
extern void bad_page_fault(struct pt_regs *, unsigned long, int);
extern void die(const char *, struct pt_regs *, long);
+extern void _exception(int, struct pt_regs *, int, unsigned long);
#ifdef CONFIG_BOOKE_WDT
extern u32 booke_wdt_enabled;
extern u32 booke_wdt_period;