lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

24
arch/tile/mm/fault.c
View File

@ -43,8 +43,11 @@
#include <arch/interrupts.h>
static noinline void force_sig_info_fault(int si_signo, int si_code,
unsigned long address, int fault_num, struct task_struct *tsk)
static noinline void force_sig_info_fault(const char *type, int si_signo,
int si_code, unsigned long address,
int fault_num,
struct task_struct *tsk,
struct pt_regs *regs)
{
siginfo_t info;
@ -59,6 +62,7 @@ static noinline void force_sig_info_fault(int si_signo, int si_code,
info.si_code = si_code;
info.si_addr = (void __user *)address;
info.si_trapno = fault_num;
trace_unhandled_signal(type, regs, address, si_signo);
force_sig_info(si_signo, &info, tsk);
}
@ -71,11 +75,12 @@ SYSCALL_DEFINE2(cmpxchg_badaddr, unsigned long, address,
struct pt_regs *, regs)
{
if (address >= PAGE_OFFSET)
force_sig_info_fault(SIGSEGV, SEGV_MAPERR, address,
INT_DTLB_MISS, current);
force_sig_info_fault("atomic segfault", SIGSEGV, SEGV_MAPERR,
address, INT_DTLB_MISS, current, regs);
else
force_sig_info_fault(SIGBUS, BUS_ADRALN, address,
INT_UNALIGN_DATA, current);
force_sig_info_fault("atomic alignment fault", SIGBUS,
BUS_ADRALN, address,
INT_UNALIGN_DATA, current, regs);
/*
* Adjust pc to point at the actual instruction, which is unusual
@ -471,8 +476,8 @@ bad_area_nosemaphore:
*/
local_irq_enable();
force_sig_info_fault(SIGSEGV, si_code, address,
fault_num, tsk);
force_sig_info_fault("segfault", SIGSEGV, si_code, address,
fault_num, tsk, regs);
return 0;
}
@ -547,7 +552,8 @@ do_sigbus:
if (is_kernel_mode)
goto no_context;
force_sig_info_fault(SIGBUS, BUS_ADRERR, address, fault_num, tsk);
force_sig_info_fault("bus error", SIGBUS, BUS_ADRERR, address,
fault_num, tsk, regs);
return 0;
}