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authorJesper Nilsson <jesper.nilsson@axis.com>2010-08-04 17:42:43 +0200
committerJesper Nilsson <jesper.nilsson@axis.com>2010-08-04 18:28:48 +0200
commitb4e8a1813c7d65a7c28a3536da08444c21f2c37b (patch)
tree7b310dfaf31e41d6ff37a0cef2d271c1fca8003e
parent028c1f6817c1ef49c61641dc1ae6c629e5bb32df (diff)
downloadlinux-b4e8a1813c7d65a7c28a3536da08444c21f2c37b.tar.gz
CRIS: Add config for pausing a seg-faulting process
Put it on a wait queue, so we can attach gdb to the process to debug it instead of just killing it. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
-rw-r--r--arch/cris/Kconfig.debug6
-rw-r--r--arch/cris/mm/fault.c13
2 files changed, 16 insertions, 3 deletions
diff --git a/arch/cris/Kconfig.debug b/arch/cris/Kconfig.debug
index 0a1d62a23614..0b9a630dc812 100644
--- a/arch/cris/Kconfig.debug
+++ b/arch/cris/Kconfig.debug
@@ -32,4 +32,10 @@ config DEBUG_NMI_OOPS
If the system locks up without any debug information you can say Y
here to make it possible to dump an OOPS with an external NMI.
+config NO_SEGFAULT_TERMINATION
+ bool "Keep segfaulting processes"
+ help
+ Place segfaulting user mode processes on a wait queue instead of
+ delivering a terminating SIGSEGV to allow debugging with gdb.
+
endmenu
diff --git a/arch/cris/mm/fault.c b/arch/cris/mm/fault.c
index a2b4c0b8f0fd..7705cd7cef36 100644
--- a/arch/cris/mm/fault.c
+++ b/arch/cris/mm/fault.c
@@ -7,6 +7,7 @@
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/module.h>
+#include <linux/wait.h>
#include <asm/uaccess.h>
extern int find_fixup_code(struct pt_regs *);
@@ -190,14 +191,20 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
/* User mode accesses just cause a SIGSEGV */
if (user_mode(regs)) {
+ printk(KERN_NOTICE "%s (pid %d) segfaults for page "
+ "address %08lx at pc %08lx\n",
+ tsk->comm, tsk->pid,
+ address, instruction_pointer(regs));
+#ifdef CONFIG_NO_SEGFAULT_TERMINATION
+ DECLARE_WAIT_QUEUE_HEAD(wq);
+ wait_event_interruptible(wq, 0 == 1);
+#else
info.si_signo = SIGSEGV;
info.si_errno = 0;
/* info.si_code has been set above */
info.si_addr = (void *)address;
force_sig_info(SIGSEGV, &info, tsk);
- printk(KERN_NOTICE "%s (pid %d) segfaults for page "
- "address %08lx at pc %08lx\n",
- tsk->comm, tsk->pid, address, instruction_pointer(regs));
+#endif
return;
}