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authorDavid Daney <ddaney@caviumnetworks.com>2010-08-03 11:22:20 -0700
committerRalf Baechle <ralf@linux-mips.org>2010-08-05 13:26:29 +0100
commitc1bf207d6ee1eb72e9c10365edbdc7c9ff7fb9b0 (patch)
tree4c5875c8bd9087cd7b2193ac264c002cc384febb /arch/mips/mm
parent2ea6399f553bf9a47260723b44d50f747e310218 (diff)
MIPS: kprobe: Add support.
This patch is based on previous work by Sony and Himanshu Chauhan. I have done some cleanup and implemented JProbes and KRETPROBES. The KRETPROBES part is pretty much copied verbatim from powerpc. A possible future enhance might be to factor out the common code. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Cc: Himanshu Chauhan <hschauhan@nulltrace.org> To: linux-mips@linux-mips.org To: ananth@in.ibm.com, To: anil.s.keshavamurthy@intel.com To: davem@davemloft.net To: masami.hiramatsu.pt@hitachi.com Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/1525/ Patchwork: https://patchwork.linux-mips.org/patch/1530/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mm')
-rw-r--r--arch/mips/mm/fault.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index b4aac424b2e..783ad0065fd 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -17,6 +17,7 @@
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/module.h>
+#include <linux/kprobes.h>
#include <asm/branch.h>
#include <asm/mmu_context.h>
@@ -24,13 +25,14 @@
#include <asm/uaccess.h>
#include <asm/ptrace.h>
#include <asm/highmem.h> /* For VMALLOC_END */
+#include <linux/kdebug.h>
/*
* This routine handles page faults. It determines the address,
* and the problem, and then passes it off to one of the appropriate
* routines.
*/
-asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
+asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, unsigned long write,
unsigned long address)
{
struct vm_area_struct * vma = NULL;
@@ -46,6 +48,17 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
field, regs->cp0_epc);
#endif
+#ifdef CONFIG_KPROBES
+ /*
+ * This is to notify the fault handler of the kprobes. The
+ * exception code is redundant as it is also carried in REGS,
+ * but we pass it anyhow.
+ */
+ if (notify_die(DIE_PAGE_FAULT, "page fault", regs, -1,
+ (regs->cp0_cause >> 2) & 0x1f, SIGSEGV) == NOTIFY_STOP)
+ return;
+#endif
+
info.si_code = SEGV_MAPERR;
/*