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m68k: Add helper function handle_kernel_fault()

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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>
This commit is contained in:
Roman Zippel
2008-11-18 21:25:17 +01:00
committed by Geert Uytterhoeven
parent 521cb40b0c
commit dcdf3a2935
3 changed files with 26 additions and 16 deletions
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24
arch/m68k/kernel/signal.c
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@@ -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.
*/