arch/tile: support signal "exception-trace" hook
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>
diff --git a/arch/tile/kernel/compat_signal.c b/arch/tile/kernel/compat_signal.c
index dbb0dfc..a7869ad 100644
--- a/arch/tile/kernel/compat_signal.c
+++ b/arch/tile/kernel/compat_signal.c
@@ -317,7 +317,7 @@
return 0;
badframe:
- force_sig(SIGSEGV, current);
+ signal_fault("bad sigreturn frame", regs, frame, 0);
return 0;
}
@@ -431,6 +431,6 @@
return 0;
give_sigsegv:
- force_sigsegv(sig, current);
+ signal_fault("bad setup frame", regs, frame, sig);
return -EFAULT;
}