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arch/tile: support signal "exception-trace" hook

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This change adds support for /proc/sys/debug/exception-trace to tile.
Like x86 and sparc, by default it is set to "1", generating a one-line
printk whenever a user process crashes.  By setting it to "2", we get
a much more complete userspace diagnostic at crash time, including
a user-space backtrace, register dump, and memory dump around the
address of the crash.

Some vestiges of the Tilera-internal version of this support are
removed with this patch (the show_crashinfo variable and the
arch_coredump_signal function).  We retain a "crashinfo" boot parameter
which allows you to set the boot-time value of exception-trace.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
2011-05-16 14:23:44 -04:00
parent 8aaf1dda42
commit 571d76acda
8 changed files with 151 additions and 23 deletions
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4
arch/tile/include/asm/signal.h
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@ -28,6 +28,10 @@ struct pt_regs;
int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
int setup_sigcontext(struct sigcontext __user *, struct pt_regs *);
void do_signal(struct pt_regs *regs);
void signal_fault(const char *type, struct pt_regs *,
void __user *frame, int sig);
void trace_unhandled_signal(const char *type, struct pt_regs *regs,
unsigned long address, int signo);
#endif
#endif /* _ASM_TILE_SIGNAL_H */