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authorRoman Zippel <zippel@linux-m68k.org>2008-11-18 21:25:17 +0100
committerGeert Uytterhoeven <geert@linux-m68k.org>2011-03-16 19:10:40 +0100
commitdcdf3a293522e6ef09d8b3650ac1ceec56438e5d (patch)
treed890d29cd098f39aa742c16eec404e90ef6bd1bc /arch/m68k/kernel
parent521cb40b0c44418a4fd36dc633f575813d59a43d (diff)
downloadop-kernel-dev-dcdf3a293522e6ef09d8b3650ac1ceec56438e5d.zip
op-kernel-dev-dcdf3a293522e6ef09d8b3650ac1ceec56438e5d.tar.gz
m68k: Add helper function handle_kernel_fault()
Add helper function handle_kernel_fault() in signal.c, so frame_extra_sizes can become static, and to avoid future code duplication. Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/kernel')
-rw-r--r--arch/m68k/kernel/signal.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
index d12c3b0..a0afc23 100644
--- a/arch/m68k/kernel/signal.c
+++ b/arch/m68k/kernel/signal.c
@@ -42,6 +42,7 @@
#include <linux/personality.h>
#include <linux/tty.h>
#include <linux/binfmts.h>
+#include <linux/module.h>
#include <asm/setup.h>
#include <asm/uaccess.h>
@@ -51,7 +52,7 @@
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-const int frame_extra_sizes[16] = {
+static const int frame_extra_sizes[16] = {
[1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
[2] = sizeof(((struct frame *)0)->un.fmt2),
[3] = sizeof(((struct frame *)0)->un.fmt3),
@@ -69,6 +70,27 @@ const int frame_extra_sizes[16] = {
[15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
};
+int handle_kernel_fault(struct pt_regs *regs)
+{
+ const struct exception_table_entry *fixup;
+ struct pt_regs *tregs;
+
+ /* Are we prepared to handle this kernel fault? */
+ fixup = search_exception_tables(regs->pc);
+ if (!fixup)
+ return 0;
+
+ /* Create a new four word stack frame, discarding the old one. */
+ regs->stkadj = frame_extra_sizes[regs->format];
+ tregs = (struct pt_regs *)((long)regs + regs->stkadj);
+ tregs->vector = regs->vector;
+ tregs->format = 0;
+ tregs->pc = fixup->fixup;
+ tregs->sr = regs->sr;
+
+ return 1;
+}
+
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
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