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authorLinus Torvalds <torvalds@linux-foundation.org>2011-03-16 19:08:03 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-16 19:08:03 -0700
commitdc113c1f1d4b47af1b1ca701c5a39e24d296c2ac (patch)
tree0bb5ce21bcd41a9443708567edbdca80d9a72397 /arch/m68k/kernel
parent63a93699c6a58795b854ff573542a08367684dae (diff)
parent059718d572e8ad388313b863aff717623bb2552f (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k: m68k/block: amiflop - Remove superfluous amiga_chip_alloc() cast m68k/atari: ARAnyM - Add support for network access m68k/atari: ARAnyM - Add support for console access m68k/atari: ARAnyM - Add support for block access m68k/atari: Initial ARAnyM support m68k: Kconfig - Remove unneeded "default n" m68k: Makefiles - Change to new flags variables m68k/amiga: Reclaim Chip RAM for PPC exception handlers m68k: Allow all kernel traps to be handled via exception fixups m68k: Use base_trap_init() to initialize vectors m68k: Add helper function handle_kernel_fault()
Diffstat (limited to 'arch/m68k/kernel')
-rw-r--r--arch/m68k/kernel/setup.c5
-rw-r--r--arch/m68k/kernel/signal.c24
-rw-r--r--arch/m68k/kernel/traps.c20
3 files changed, 40 insertions, 9 deletions
diff --git a/arch/m68k/kernel/setup.c b/arch/m68k/kernel/setup.c
index b3963ab3d14..334d8364037 100644
--- a/arch/m68k/kernel/setup.c
+++ b/arch/m68k/kernel/setup.c
@@ -42,6 +42,7 @@
#ifdef CONFIG_SUN3X
#include <asm/dvma.h>
#endif
+#include <asm/natfeat.h>
#if !FPSTATESIZE || !NR_IRQS
#warning No CPU/platform type selected, your kernel will not work!
@@ -324,6 +325,10 @@ void __init setup_arch(char **cmdline_p)
panic("No configuration setup");
}
+#ifdef CONFIG_NATFEAT
+ nf_init();
+#endif
+
paging_init();
#ifndef CONFIG_SUN3
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
index d12c3b0d9e4..a0afc239304 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.
*/
diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c
index ada4f4cca81..4022bbc2887 100644
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -48,10 +48,7 @@ asmlinkage void nmihandler(void);
asmlinkage void fpu_emu(void);
#endif
-e_vector vectors[256] = {
- [VEC_BUSERR] = buserr,
- [VEC_SYS] = system_call,
-};
+e_vector vectors[256];
/* nmi handler for the Amiga */
asm(".text\n"
@@ -61,10 +58,11 @@ asm(".text\n"
/*
* this must be called very early as the kernel might
* use some instruction that are emulated on the 060
+ * and so we're prepared for early probe attempts (e.g. nf_init).
*/
void __init base_trap_init(void)
{
- if(MACH_IS_SUN3X) {
+ if (MACH_IS_SUN3X) {
extern e_vector *sun3x_prom_vbr;
__asm__ volatile ("movec %%vbr, %0" : "=r" (sun3x_prom_vbr));
@@ -79,6 +77,10 @@ void __init base_trap_init(void)
vectors[VEC_UNIMPII] = unimp_vec;
}
+
+ vectors[VEC_BUSERR] = buserr;
+ vectors[VEC_ILLEGAL] = trap;
+ vectors[VEC_SYS] = system_call;
}
void __init trap_init (void)
@@ -1055,9 +1057,11 @@ asmlinkage void trap_c(struct frame *fp)
siginfo_t info;
if (fp->ptregs.sr & PS_S) {
- if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
- /* traced a trapping instruction */
- } else
+ if (fp->ptregs.vector == VEC_TRACE << 2) {
+ /* traced a trapping instruction on a 68020/30,
+ * real exception will be executed afterwards.
+ */
+ } else if (!handle_kernel_fault(&fp->ptregs))
bad_super_trap(fp);
return;
}