m68k-allow-all-kernel-traps-to-be-handled-via-exception-fixups-all.diff
Allow all kernel traps to be handled via exception fixups.
Signed-off-by: Andreas Schwab <schwab@suse.de>
--------------------
From: Roman Zippel <zippel@linux-m68k.org>
Add helper function handle_kernel_fault() in signal.c, so
frame_extra_sizes can become static and to reduce code duplication.
Use base_trap_init() to initialize vectors, so basic initialization is
all in one place.
Remove the VEC_TRACE check from trap_c, I can only guess it's left from
an old kgdb patch, as right now it does nothing.
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
--------------------
From: Andreas Schwab <andreas@ubb.ca>
Reinstate VEC_TRACE check, needed for 68020/30.
Signed-off-by: Andreas Schwab <schwab@suse.de>
--------------------
From: Roman Zippel <zippel@ubb.ca>
no need to set TIF_DELAYED_TRACE
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
index f9af893..d1e9220 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>
@@ -53,7 +54,7 @@
asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
-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),
@@ -71,6 +72,27 @@
[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 6d813de..e699221 100644
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -48,10 +48,7 @@
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 @@
/*
* 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 @@
vectors[VEC_UNIMPII] = unimp_vec;
}
+
+ vectors[VEC_BUSERR] = buserr;
+ vectors[VEC_ILLEGAL] = trap;
+ vectors[VEC_SYS] = system_call;
}
void __init trap_init (void)
@@ -1055,10 +1057,11 @@
siginfo_t info;
if (fp->ptregs.sr & PS_S) {
- if ((fp->ptregs.vector >> 2) == VEC_TRACE) {
- /* traced a trapping instruction */
- current->ptrace |= PT_DTRACE;
- } 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;
}
diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c
index f493f03..69f0f22 100644
--- a/arch/m68k/mm/fault.c
+++ b/arch/m68k/mm/fault.c
@@ -18,7 +18,6 @@
#include <asm/pgalloc.h>
extern void die_if_kernel(char *, struct pt_regs *, long);
-extern const int frame_extra_sizes[]; /* in m68k/kernel/signal.c */
int send_fault_sig(struct pt_regs *regs)
{
@@ -35,21 +34,8 @@
force_sig_info(siginfo.si_signo,
&siginfo, current);
} else {
- const struct exception_table_entry *fixup;
-
- /* Are we prepared to handle this kernel fault? */
- if ((fixup = search_exception_tables(regs->pc))) {
- struct pt_regs *tregs;
- /* Create a new four word stack frame, discarding the old
- one. */
- regs->stkadj = frame_extra_sizes[regs->format];
- tregs = (struct pt_regs *)((ulong)regs + regs->stkadj);
- tregs->vector = regs->vector;
- tregs->format = 0;
- tregs->pc = fixup->fixup;
- tregs->sr = regs->sr;
+ if (handle_kernel_fault(regs))
return -1;
- }
//if (siginfo.si_signo == SIGBUS)
// force_sig_info(siginfo.si_signo,
diff --git a/include/asm-m68k/processor.h b/include/asm-m68k/processor.h
index 1f61ef5..7755ca0 100644
--- a/include/asm-m68k/processor.h
+++ b/include/asm-m68k/processor.h
@@ -127,4 +127,6 @@
#define cpu_relax() barrier()
+extern int handle_kernel_fault(struct pt_regs *regs);
+
#endif
