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| author | Jesper Nilsson <jesper.nilsson@axis.com> | 2010-08-04 17:42:43 +0200 |
|---|---|---|
| committer | Jesper Nilsson <jesper.nilsson@axis.com> | 2010-08-04 18:28:48 +0200 |
| commit | b4e8a1813c7d65a7c28a3536da08444c21f2c37b (patch) | |
| tree | 7b310dfaf31e41d6ff37a0cef2d271c1fca8003e | |
| parent | CRIS: Don't take faults while in_atomic (diff) | |
| download | linux-b4e8a1813c7d65a7c28a3536da08444c21f2c37b.tar.xz linux-b4e8a1813c7d65a7c28a3536da08444c21f2c37b.zip | |
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.debug | 6 | ||||
| -rw-r--r-- | arch/cris/mm/fault.c | 13 |
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; } |