From: Greg Ungerer <gerg@xxxxxxxxxxx>
The MMU (signal_mm.c) and non-MMU (signal_no.c) versions of the m68k
architecture signal handling code are very similar. Most of there code is
the same.
Merge the two back into a single signal.c, and move some of the code around
inside the file to minimize the number of #ifdefs required. Specificially
we can group out the CONFIG_FPU and the CONFIG_MMU code. We end up needing
a few other "#ifdef CONFIG_MMU" as well, but not too many.
Signed-off-by: Greg Ungerer <gerg@xxxxxxxxxxx>
---
arch/m68k/kernel/{signal_mm.c => signal.c} | 529 +++++++++++--------
arch/m68k/kernel/signal_no.c | 765 ----------------------------
2 files changed, 308 insertions(+), 986 deletions(-)
rename arch/m68k/kernel/{signal_mm.c => signal.c} (93%)
delete mode 100644 arch/m68k/kernel/signal_no.c
diff --git a/arch/m68k/kernel/signal_mm.c b/arch/m68k/kernel/signal.c
similarity index 93%
rename from arch/m68k/kernel/signal_mm.c
rename to arch/m68k/kernel/signal.c
index cb856f9..1747c70 100644
--- a/arch/m68k/kernel/signal_mm.c
+++ b/arch/m68k/kernel/signal.c
@@ -52,15 +52,24 @@
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-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),
+#ifdef CONFIG_MMU
+
+/*
+ * Handle the slight differences in classic 68k and ColdFire trap frames.
+ */
#ifdef CONFIG_COLDFIRE
- [4] = 0,
+#define FORMAT 4
+#define FMT4SIZE 0
#else
- [4] = sizeof(((struct frame *)0)->un.fmt4),
+#define FORMAT 0
+#define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4)
#endif
+
+static const int frame_size_change[16] = {
+ [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */
+ [2] = sizeof(((struct frame *)0)->un.fmt2),
+ [3] = sizeof(((struct frame *)0)->un.fmt3),
+ [4] = FMT4SIZE,
[5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */
[6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */
[7] = sizeof(((struct frame *)0)->un.fmt7),
@@ -74,6 +83,11 @@ static const int frame_extra_sizes[16] = {
[15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */
};
+static inline int frame_extra_sizes(int f)
+{
+ return frame_size_change[f];
+}
+
int handle_kernel_fault(struct pt_regs *regs)
{
const struct exception_table_entry *fixup;
@@ -85,20 +99,131 @@ int handle_kernel_fault(struct pt_regs *regs)
return 0;
/* Create a new four word stack frame, discarding the old one. */
- regs->stkadj = frame_extra_sizes[regs->format];
+ regs->stkadj = frame_extra_sizes(regs->format);
tregs = (struct pt_regs *)((long)regs + regs->stkadj);
tregs->vector = regs->vector;
-#ifdef CONFIG_COLDFIRE
- tregs->format = 4;
-#else
- tregs->format = 0;
-#endif
+ tregs->format = FORMAT;
tregs->pc = fixup->fixup;
tregs->sr = regs->sr;
return 1;
}
+void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
+{
+ if (regs->orig_d0 < 0)
+ return;
+ switch (regs->d0) {
+ case -ERESTARTNOHAND:
+ case -ERESTARTSYS:
+ case -ERESTARTNOINTR:
+ regs->d0 = regs->orig_d0;
+ regs->orig_d0 = -1;
+ regs->pc -= 2;
+ break;
+ }
+}
+
+static inline void push_cache (unsigned long vaddr)
+{
+ /*
+ * Using the old cache_push_v() was really a big waste.
+ *
+ * What we are trying to do is to flush 8 bytes to ram.
+ * Flushing 2 cache lines of 16 bytes is much cheaper than
+ * flushing 1 or 2 pages, as previously done in
+ * cache_push_v().
+ * Jes
+ */
+ if (CPU_IS_040) {
+ unsigned long temp;
+
+ __asm__ __volatile__ (".chip 68040\n\t"
+ "nop\n\t"
+ "ptestr (%1)\n\t"
+ "movec %%mmusr,%0\n\t"
+ ".chip 68k"
+ : "=r" (temp)
+ : "a" (vaddr));
+
+ temp &= PAGE_MASK;
+ temp |= vaddr & ~PAGE_MASK;
+
+ __asm__ __volatile__ (".chip 68040\n\t"
+ "nop\n\t"
+ "cpushl %%bc,(%0)\n\t"
+ ".chip 68k"
+ : : "a" (temp));
+ }
+ else if (CPU_IS_060) {
+ unsigned long temp;
+ __asm__ __volatile__ (".chip 68060\n\t"
+ "plpar (%0)\n\t"
+ ".chip 68k"
+ : "=a" (temp)
+ : "0" (vaddr));
+ __asm__ __volatile__ (".chip 68060\n\t"
+ "cpushl %%bc,(%0)\n\t"
+ ".chip 68k"
+ : : "a" (temp));
+ } else if (!CPU_IS_COLDFIRE) {
+ /*
+ * 68030/68020 have no writeback cache;
+ * still need to clear icache.
+ * Note that vaddr is guaranteed to be long word aligned.
+ */
+ unsigned long temp;
+ asm volatile ("movec %%cacr,%0" : "=r" (temp));
+ temp += 4;
+ asm volatile ("movec %0,%%caar\n\t"
+ "movec %1,%%cacr"
+ : : "r" (vaddr), "r" (temp));
+ asm volatile ("movec %0,%%caar\n\t"
+ "movec %1,%%cacr"
+ : : "r" (vaddr + 4), "r" (temp));
+ }
+}
+
+static inline void adjustformat(struct pt_regs *regs)
+{
+}
+
+static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
+{
+}
+
+#else /* CONFIG_MMU */
+
+void ret_from_user_signal(void);
+void ret_from_user_rt_signal(void);
+
+static inline int frame_extra_sizes(int f)
+{
+ /* No frame size adjustments required on non-MMU CPUs */
+ return 0;
+}
+
+static inline void adjustformat(struct pt_regs *regs)
+{
+ ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
+ /*
+ * set format byte to make stack appear modulo 4, which it will
+ * be when doing the rte
+ */
+ regs->format = 0x4;
+}
+
+static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs)
+{
+ sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
+}
+
+static inline void push_cache(unsigned long vaddr)
+{
+}
+
+#endif /* CONFIG_MMU */
+
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
@@ -187,6 +312,12 @@ struct rt_sigframe
struct ucontext uc;
};
+#define FPCONTEXT_SIZE 216
+#define uc_fpstate uc_filler[0]
+#define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
+#define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
+
+#ifdef CONFIG_FPU
static unsigned char fpu_version; /* version number of fpu, set by setup_frame */
@@ -266,11 +397,6 @@ out:
return err;
}
-#define FPCONTEXT_SIZE 216
-#define uc_fpstate uc_filler[0]
-#define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
-#define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
-
static inline int rt_restore_fpu_state(struct ucontext __user *uc)
{
unsigned char fpstate[FPCONTEXT_SIZE];
@@ -366,10 +492,160 @@ out:
return err;
}
+/*
+ * Set up a signal frame.
+ */
+static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
+{
+ if (FPU_IS_EMU) {
+ /* save registers */
+ memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
+ memcpy(sc->sc_fpregs, current->thread.fp, 24);
+ return;
+ }
+
+ if (CPU_IS_COLDFIRE) {
+ __asm__ volatile ("fsave %0"
+ : : "m" (*sc->sc_fpstate) : "memory");
+ } else {
+ __asm__ volatile (".chip 68k/68881\n\t"
+ "fsave %0\n\t"
+ ".chip 68k"
+ : : "m" (*sc->sc_fpstate) : "memory");
+ }
+
+ if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
+ fpu_version = sc->sc_fpstate[0];
+ if (CPU_IS_020_OR_030 &&
+ regs->vector >= (VEC_FPBRUC * 4) &&
+ regs->vector <= (VEC_FPNAN * 4)) {
+ /* Clear pending exception in 68882 idle frame */
+ if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
+ sc->sc_fpstate[0x38] |= 1 << 3;
+ }
+
+ if (CPU_IS_COLDFIRE) {
+ __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
+ "fmovel %%fpcr,%1\n\t"
+ "fmovel %%fpsr,%2\n\t"
+ "fmovel %%fpiar,%3"
+ : "=m" (sc->sc_fpregs[0]),
+ "=m" (sc->sc_fpcntl[0]),
+ "=m" (sc->sc_fpcntl[1]),
+ "=m" (sc->sc_fpcntl[2])
+ : /* no inputs */
+ : "memory");
+ } else {
+ __asm__ volatile (".chip 68k/68881\n\t"
+ "fmovemx %%fp0-%%fp1,%0\n\t"
+ "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
+ ".chip 68k"
+ : "=m" (*sc->sc_fpregs),
+ "=m" (*sc->sc_fpcntl)
+ : /* no inputs */
+ : "memory");
+ }
+ }
+}
+
+static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
+{
+ unsigned char fpstate[FPCONTEXT_SIZE];
+ int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
+ int err = 0;
+
+ if (FPU_IS_EMU) {
+ /* save fpu control register */
+ err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
+ current->thread.fpcntl, 12);
+ /* save all other fpu register */
+ err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
+ current->thread.fp, 96);
+ return err;
+ }
+
+ if (CPU_IS_COLDFIRE) {
+ __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
+ } else {
+ __asm__ volatile (".chip 68k/68881\n\t"
+ "fsave %0\n\t"
+ ".chip 68k"
+ : : "m" (*fpstate) : "memory");
+ }
+
+ err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
+ if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
+ fpregset_t fpregs;
+ if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
+ context_size = fpstate[1];
+ fpu_version = fpstate[0];
+ if (CPU_IS_020_OR_030 &&
+ regs->vector >= (VEC_FPBRUC * 4) &&
+ regs->vector <= (VEC_FPNAN * 4)) {
+ /* Clear pending exception in 68882 idle frame */
+ if (*(unsigned short *) fpstate == 0x1f38)
+ fpstate[0x38] |= 1 << 3;
+ }
+ if (CPU_IS_COLDFIRE) {
+ __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
+ "fmovel %%fpcr,%1\n\t"
+ "fmovel %%fpsr,%2\n\t"
+ "fmovel %%fpiar,%3"
+ : "=m" (fpregs.f_fpregs[0]),
+ "=m" (fpregs.f_fpcntl[0]),
+ "=m" (fpregs.f_fpcntl[1]),
+ "=m" (fpregs.f_fpcntl[2])
+ : /* no inputs */
+ : "memory");
+ } else {
+ __asm__ volatile (".chip 68k/68881\n\t"
+ "fmovemx %%fp0-%%fp7,%0\n\t"
+ "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
+ ".chip 68k"
+ : "=m" (*fpregs.f_fpregs),
+ "=m" (*fpregs.f_fpcntl)
+ : /* no inputs */
+ : "memory");
+ }
+ err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
+ sizeof(fpregs));
+ }
+ if (context_size)
+ err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
+ context_size);
+ return err;
+}
+
+#else /* CONFIG_FPU */
+
+/*
+ * For the case with no FPU configured these all do nothing.
+ */
+static inline int restore_fpu_state(struct sigcontext *sc)
+{
+ return 0;
+}
+
+static inline int rt_restore_fpu_state(struct ucontext __user *uc)
+{
+ return 0;
+}
+
+static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
+{
+}
+
+static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
+{
+ return 0;
+}
+
+#endif /* CONFIG_FPU */
+
static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
void __user *fp)
{
- int fsize = frame_extra_sizes[formatvec >> 12];
+ int fsize = frame_extra_sizes(formatvec >> 12);
if (fsize < 0) {
/*
* user process trying to return with weird frame format
@@ -427,7 +703,7 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __u
{
int formatvec;
struct sigcontext context;
- int err;
+ int err = 0;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
@@ -566,131 +842,6 @@ badframe:
return 0;
}
-/*
- * Set up a signal frame.
- */
-
-static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
-{
- if (FPU_IS_EMU) {
- /* save registers */
- memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
- memcpy(sc->sc_fpregs, current->thread.fp, 24);
- return;
- }
-
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("fsave %0"
- : : "m" (*sc->sc_fpstate) : "memory");
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "fsave %0\n\t"
- ".chip 68k"
- : : "m" (*sc->sc_fpstate) : "memory");
- }
-
- if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
- fpu_version = sc->sc_fpstate[0];
- if (CPU_IS_020_OR_030 &&
- regs->vector >= (VEC_FPBRUC * 4) &&
- regs->vector <= (VEC_FPNAN * 4)) {
- /* Clear pending exception in 68882 idle frame */
- if (*(unsigned short *) sc->sc_fpstate == 0x1f38)
- sc->sc_fpstate[0x38] |= 1 << 3;
- }
-
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t"
- "fmovel %%fpcr,%1\n\t"
- "fmovel %%fpsr,%2\n\t"
- "fmovel %%fpiar,%3"
- : "=m" (sc->sc_fpregs[0]),
- "=m" (sc->sc_fpcntl[0]),
- "=m" (sc->sc_fpcntl[1]),
- "=m" (sc->sc_fpcntl[2])
- : /* no inputs */
- : "memory");
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "fmovemx %%fp0-%%fp1,%0\n\t"
- "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
- ".chip 68k"
- : "=m" (*sc->sc_fpregs),
- "=m" (*sc->sc_fpcntl)
- : /* no inputs */
- : "memory");
- }
- }
-}
-
-static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
-{
- unsigned char fpstate[FPCONTEXT_SIZE];
- int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0);
- int err = 0;
-
- if (FPU_IS_EMU) {
- /* save fpu control register */
- err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl,
- current->thread.fpcntl, 12);
- /* save all other fpu register */
- err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
- current->thread.fp, 96);
- return err;
- }
-
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory");
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "fsave %0\n\t"
- ".chip 68k"
- : : "m" (*fpstate) : "memory");
- }
-
- err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
- if (CPU_IS_060 ? fpstate[2] : fpstate[0]) {
- fpregset_t fpregs;
- if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
- context_size = fpstate[1];
- fpu_version = fpstate[0];
- if (CPU_IS_020_OR_030 &&
- regs->vector >= (VEC_FPBRUC * 4) &&
- regs->vector <= (VEC_FPNAN * 4)) {
- /* Clear pending exception in 68882 idle frame */
- if (*(unsigned short *) fpstate == 0x1f38)
- fpstate[0x38] |= 1 << 3;
- }
- if (CPU_IS_COLDFIRE) {
- __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t"
- "fmovel %%fpcr,%1\n\t"
- "fmovel %%fpsr,%2\n\t"
- "fmovel %%fpiar,%3"
- : "=m" (fpregs.f_fpregs[0]),
- "=m" (fpregs.f_fpcntl[0]),
- "=m" (fpregs.f_fpcntl[1]),
- "=m" (fpregs.f_fpcntl[2])
- : /* no inputs */
- : "memory");
- } else {
- __asm__ volatile (".chip 68k/68881\n\t"
- "fmovemx %%fp0-%%fp7,%0\n\t"
- "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
- ".chip 68k"
- : "=m" (*fpregs.f_fpregs),
- "=m" (*fpregs.f_fpcntl)
- : /* no inputs */
- : "memory");
- }
- err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
- sizeof(fpregs));
- }
- if (context_size)
- err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
- context_size);
- return err;
-}
-
static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
unsigned long mask)
{
@@ -703,6 +854,7 @@ static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
sc->sc_sr = regs->sr;
sc->sc_pc = regs->pc;
sc->sc_formatvec = regs->format << 12 | regs->vector;
+ save_a5_state(sc, regs);
save_fpu_state(sc, regs);
}
@@ -736,66 +888,6 @@ static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *
return err;
}
-static inline void push_cache (unsigned long vaddr)
-{
- /*
- * Using the old cache_push_v() was really a big waste.
- *
- * What we are trying to do is to flush 8 bytes to ram.
- * Flushing 2 cache lines of 16 bytes is much cheaper than
- * flushing 1 or 2 pages, as previously done in
- * cache_push_v().
- * Jes
- */
- if (CPU_IS_040) {
- unsigned long temp;
-
- __asm__ __volatile__ (".chip 68040\n\t"
- "nop\n\t"
- "ptestr (%1)\n\t"
- "movec %%mmusr,%0\n\t"
- ".chip 68k"
- : "=r" (temp)
- : "a" (vaddr));
-
- temp &= PAGE_MASK;
- temp |= vaddr & ~PAGE_MASK;
-
- __asm__ __volatile__ (".chip 68040\n\t"
- "nop\n\t"
- "cpushl %%bc,(%0)\n\t"
- ".chip 68k"
- : : "a" (temp));
- }
- else if (CPU_IS_060) {
- unsigned long temp;
- __asm__ __volatile__ (".chip 68060\n\t"
- "plpar (%0)\n\t"
- ".chip 68k"
- : "=a" (temp)
- : "0" (vaddr));
- __asm__ __volatile__ (".chip 68060\n\t"
- "cpushl %%bc,(%0)\n\t"
- ".chip 68k"
- : : "a" (temp));
- } else if (!CPU_IS_COLDFIRE) {
- /*
- * 68030/68020 have no writeback cache;
- * still need to clear icache.
- * Note that vaddr is guaranteed to be long word aligned.
- */
- unsigned long temp;
- asm volatile ("movec %%cacr,%0" : "=r" (temp));
- temp += 4;
- asm volatile ("movec %0,%%caar\n\t"
- "movec %1,%%cacr"
- : : "r" (vaddr), "r" (temp));
- asm volatile ("movec %0,%%caar\n\t"
- "movec %1,%%cacr"
- : : "r" (vaddr + 4), "r" (temp));
- }
-}
-
static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
{
@@ -816,7 +908,7 @@ static int setup_frame (int sig, struct k_sigaction *ka,
sigset_t *set, struct pt_regs *regs)
{
struct sigframe __user *frame;
- int fsize = frame_extra_sizes[regs->format];
+ int fsize = frame_extra_sizes(regs->format);
struct sigcontext context;
int err = 0;
@@ -851,10 +943,14 @@ static int setup_frame (int sig, struct k_sigaction *ka,
err |= copy_to_user (&frame->sc, &context, sizeof(context));
/* Set up to return from userspace. */
+#ifdef CONFIG_MMU
err |= __put_user(frame->retcode, &frame->pretcode);
/* moveq #,d0; trap #0 */
err |= __put_user(0x70004e40 + (__NR_sigreturn << 16),
(long __user *)(frame->retcode));
+#else
+ err |= __put_user((void *) ret_from_user_signal, &frame->pretcode);
+#endif
if (err)
goto give_sigsegv;
@@ -867,6 +963,7 @@ static int setup_frame (int sig, struct k_sigaction *ka,
*/
wrusp ((unsigned long) frame);
regs->pc = (unsigned long) ka->sa.sa_handler;
+ adjustformat(regs);
/*
* This is subtle; if we build more than one sigframe, all but the
@@ -901,7 +998,7 @@ static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
- int fsize = frame_extra_sizes[regs->format];
+ int fsize = frame_extra_sizes(regs->format);
int err = 0;
if (fsize < 0) {
@@ -939,6 +1036,7 @@ static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
/* Set up to return from userspace. */
+#ifdef CONFIG_MMU
err |= __put_user(frame->retcode, &frame->pretcode);
#ifdef __mcoldfire__
/* movel #__NR_rt_sigreturn,d0; trap #0 */
@@ -951,6 +1049,9 @@ static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
(long __user *)(frame->retcode + 0));
err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4));
#endif
+#else
+ err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode);
+#endif /* CONFIG_MMU */
if (err)
goto give_sigsegv;
@@ -963,6 +1064,7 @@ static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
*/
wrusp ((unsigned long) frame);
regs->pc = (unsigned long) ka->sa.sa_handler;
+ adjustformat(regs);
/*
* This is subtle; if we build more than one sigframe, all but the
@@ -1026,21 +1128,6 @@ handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
}
}
-void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
-{
- if (regs->orig_d0 < 0)
- return;
- switch (regs->d0) {
- case -ERESTARTNOHAND:
- case -ERESTARTSYS:
- case -ERESTARTNOINTR:
- regs->d0 = regs->orig_d0;
- regs->orig_d0 = -1;
- regs->pc -= 2;
- break;
- }
-}
-
/*
* OK, we're invoking a handler
*/
diff --git a/arch/m68k/kernel/signal_no.c b/arch/m68k/kernel/signal_no.c
deleted file mode 100644
index 36a81bb..0000000
--- a/arch/m68k/kernel/signal_no.c
+++ /dev/null
@@ -1,765 +0,0 @@
-/*
- * linux/arch/m68knommu/kernel/signal.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file COPYING in the main directory of this archive
- * for more details.
- */
-
-/*
- * Linux/m68k support by Hamish Macdonald
- *
- * 68060 fixes by Jesper Skov
- *
- * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab
- *
- * mathemu support by Roman Zippel
- * (Note: fpstate in the signal context is completely ignored for the emulator
- * and the internal floating point format is put on stack)
- */
-
-/*
- * ++roman (07/09/96): implemented signal stacks (specially for tosemu on
- * Atari :-) Current limitation: Only one sigstack can be active at one time.
- * If a second signal with SA_ONSTACK set arrives while working on a sigstack,
- * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
- * signal handlers!
- */
-
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/syscalls.h>
-#include <linux/errno.h>
-#include <linux/wait.h>
-#include <linux/ptrace.h>
-#include <linux/unistd.h>
-#include <linux/stddef.h>
-#include <linux/highuid.h>
-#include <linux/tty.h>
-#include <linux/personality.h>
-#include <linux/binfmts.h>
-
-#include <asm/setup.h>
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/traps.h>
-#include <asm/ucontext.h>
-
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
-void ret_from_user_signal(void);
-void ret_from_user_rt_signal(void);
-
-/*
- * Atomically swap in the new signal mask, and wait for a signal.
- */
-asmlinkage int
-sys_sigsuspend(int unused0, int unused1, old_sigset_t mask)
-{
- mask &= _BLOCKABLE;
- spin_lock_irq(¤t->sighand->siglock);
- current->saved_sigmask = current->blocked;
- siginitset(¤t->blocked, mask);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- set_restore_sigmask();
-
- return -ERESTARTNOHAND;
-}
-
-asmlinkage int
-sys_sigaction(int sig, const struct old_sigaction __user *act,
- struct old_sigaction __user *oact)
-{
- struct k_sigaction new_ka, old_ka;
- int ret;
-
- if (act) {
- old_sigset_t mask;
- if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
- __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
- __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
- __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
- __get_user(mask, &act->sa_mask))
- return -EFAULT;
- siginitset(&new_ka.sa.sa_mask, mask);
- }
-
- ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
- if (!ret && oact) {
- if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
- __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
- __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
- __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
- __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
- return -EFAULT;
- }
-
- return ret;
-}
-
-asmlinkage int
-sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
-{
- return do_sigaltstack(uss, uoss, rdusp());
-}
-
-
-/*
- * Do a signal return; undo the signal stack.
- *
- * Keep the return code on the stack quadword aligned!
- * That makes the cache flush below easier.
- */
-
-struct sigframe
-{
- char __user *pretcode;
- int sig;
- int code;
- struct sigcontext __user *psc;
- char retcode[8];
- unsigned long extramask[_NSIG_WORDS-1];
- struct sigcontext sc;
-};
-
-struct rt_sigframe
-{
- char __user *pretcode;
- int sig;
- struct siginfo __user *pinfo;
- void __user *puc;
- char retcode[8];
- struct siginfo info;
- struct ucontext uc;
-};
-
-#ifdef CONFIG_FPU
-
-static unsigned char fpu_version = 0; /* version number of fpu, set by setup_frame */
-
-static inline int restore_fpu_state(struct sigcontext *sc)
-{
- int err = 1;
-
- if (FPU_IS_EMU) {
- /* restore registers */
- memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
- memcpy(current->thread.fp, sc->sc_fpregs, 24);
- return 0;
- }
-
- if (sc->sc_fpstate[0]) {
- /* Verify the frame format. */
- if (sc->sc_fpstate[0] != fpu_version)
- goto out;
-
- __asm__ volatile (".chip 68k/68881\n\t"
- "fmovemx %0,%%fp0-%%fp1\n\t"
- "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
- ".chip 68k"
- : /* no outputs */
- : "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl));
- }
- __asm__ volatile (".chip 68k/68881\n\t"
- "frestore %0\n\t"
- ".chip 68k" : : "m" (*sc->sc_fpstate));
- err = 0;
-
-out:
- return err;
-}
-
-#define FPCONTEXT_SIZE 216
-#define uc_fpstate uc_filler[0]
-#define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
-#define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
-
-static inline int rt_restore_fpu_state(struct ucontext __user *uc)
-{
- unsigned char fpstate[FPCONTEXT_SIZE];
- int context_size = 0;
- fpregset_t fpregs;
- int err = 1;
-
- if (FPU_IS_EMU) {
- /* restore fpu control register */
- if (__copy_from_user(current->thread.fpcntl,
- uc->uc_mcontext.fpregs.f_fpcntl, 12))
- goto out;
- /* restore all other fpu register */
- if (__copy_from_user(current->thread.fp,
- uc->uc_mcontext.fpregs.f_fpregs, 96))
- goto out;
- return 0;
- }
-
- if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate))
- goto out;
- if (fpstate[0]) {
- context_size = fpstate[1];
-
- /* Verify the frame format. */
- if (fpstate[0] != fpu_version)
- goto out;
- if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
- sizeof(fpregs)))
- goto out;
- __asm__ volatile (".chip 68k/68881\n\t"
- "fmovemx %0,%%fp0-%%fp7\n\t"
- "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t"
- ".chip 68k"
- : /* no outputs */
- : "m" (*fpregs.f_fpregs),
- "m" (*fpregs.f_fpcntl));
- }
- if (context_size &&
- __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1,
- context_size))
- goto out;
- __asm__ volatile (".chip 68k/68881\n\t"
- "frestore %0\n\t"
- ".chip 68k" : : "m" (*fpstate));
- err = 0;
-
-out:
- return err;
-}
-
-#endif
-
-static inline int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp,
- int *pd0)
-{
- int formatvec;
- struct sigcontext context;
- int err = 0;
-
- /* Always make any pending restarted system calls return -EINTR */
- current_thread_info()->restart_block.fn = do_no_restart_syscall;
-
- /* get previous context */
- if (copy_from_user(&context, usc, sizeof(context)))
- goto badframe;
-
- /* restore passed registers */
- regs->d1 = context.sc_d1;
- regs->a0 = context.sc_a0;
- regs->a1 = context.sc_a1;
- ((struct switch_stack *)regs - 1)->a5 = context.sc_a5;
- regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
- regs->pc = context.sc_pc;
- regs->orig_d0 = -1; /* disable syscall checks */
- wrusp(context.sc_usp);
- formatvec = context.sc_formatvec;
- regs->format = formatvec >> 12;
- regs->vector = formatvec & 0xfff;
-
-#ifdef CONFIG_FPU
- err = restore_fpu_state(&context);
-#endif
-
- *pd0 = context.sc_d0;
- return err;
-
-badframe:
- return 1;
-}
-
-static inline int
-rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
- struct ucontext __user *uc, int *pd0)
-{
- int temp;
- greg_t __user *gregs = uc->uc_mcontext.gregs;
- unsigned long usp;
- int err;
-
- /* Always make any pending restarted system calls return -EINTR */
- current_thread_info()->restart_block.fn = do_no_restart_syscall;
-
- err = __get_user(temp, &uc->uc_mcontext.version);
- if (temp != MCONTEXT_VERSION)
- goto badframe;
- /* restore passed registers */
- err |= __get_user(regs->d0, &gregs[0]);
- err |= __get_user(regs->d1, &gregs[1]);
- err |= __get_user(regs->d2, &gregs[2]);
- err |= __get_user(regs->d3, &gregs[3]);
- err |= __get_user(regs->d4, &gregs[4]);
- err |= __get_user(regs->d5, &gregs[5]);
- err |= __get_user(sw->d6, &gregs[6]);
- err |= __get_user(sw->d7, &gregs[7]);
- err |= __get_user(regs->a0, &gregs[8]);
- err |= __get_user(regs->a1, &gregs[9]);
- err |= __get_user(regs->a2, &gregs[10]);
- err |= __get_user(sw->a3, &gregs[11]);
- err |= __get_user(sw->a4, &gregs[12]);
- err |= __get_user(sw->a5, &gregs[13]);
- err |= __get_user(sw->a6, &gregs[14]);
- err |= __get_user(usp, &gregs[15]);
- wrusp(usp);
- err |= __get_user(regs->pc, &gregs[16]);
- err |= __get_user(temp, &gregs[17]);
- regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
- regs->orig_d0 = -1; /* disable syscall checks */
- regs->format = temp >> 12;
- regs->vector = temp & 0xfff;
-
- if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
- goto badframe;
-
- *pd0 = regs->d0;
- return err;
-
-badframe:
- return 1;
-}
-
-asmlinkage int do_sigreturn(unsigned long __unused)
-{
- struct switch_stack *sw = (struct switch_stack *) &__unused;
- struct pt_regs *regs = (struct pt_regs *) (sw + 1);
- unsigned long usp = rdusp();
- struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
- sigset_t set;
- int d0;
-
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
- goto badframe;
- if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
- (_NSIG_WORDS > 1 &&
- __copy_from_user(&set.sig[1], &frame->extramask,
- sizeof(frame->extramask))))
- goto badframe;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(¤t->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- if (restore_sigcontext(regs, &frame->sc, frame + 1, &d0))
- goto badframe;
- return d0;
-
-badframe:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-asmlinkage int do_rt_sigreturn(unsigned long __unused)
-{
- struct switch_stack *sw = (struct switch_stack *) &__unused;
- struct pt_regs *regs = (struct pt_regs *) (sw + 1);
- unsigned long usp = rdusp();
- struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
- sigset_t set;
- int d0;
-
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
- goto badframe;
- if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
- goto badframe;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(¤t->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- if (rt_restore_ucontext(regs, sw, &frame->uc, &d0))
- goto badframe;
- return d0;
-
-badframe:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-#ifdef CONFIG_FPU
-/*
- * Set up a signal frame.
- */
-
-static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
-{
- if (FPU_IS_EMU) {
- /* save registers */
- memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
- memcpy(sc->sc_fpregs, current->thread.fp, 24);
- return;
- }
-
- __asm__ volatile (".chip 68k/68881\n\t"
- "fsave %0\n\t"
- ".chip 68k"
- : : "m" (*sc->sc_fpstate) : "memory");
-
- if (sc->sc_fpstate[0]) {
- fpu_version = sc->sc_fpstate[0];
- __asm__ volatile (".chip 68k/68881\n\t"
- "fmovemx %%fp0-%%fp1,%0\n\t"
- "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
- ".chip 68k"
- : "=m" (*sc->sc_fpregs),
- "=m" (*sc->sc_fpcntl)
- : /* no inputs */
- : "memory");
- }
-}
-
-static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs)
-{
- unsigned char fpstate[FPCONTEXT_SIZE];
- int context_size = 0;
- int err = 0;
-
- if (FPU_IS_EMU) {
- /* save fpu control register */
- err |= copy_to_user(uc->uc_mcontext.fpregs.f_pcntl,
- current->thread.fpcntl, 12);
- /* save all other fpu register */
- err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
- current->thread.fp, 96);
- return err;
- }
-
- __asm__ volatile (".chip 68k/68881\n\t"
- "fsave %0\n\t"
- ".chip 68k"
- : : "m" (*fpstate) : "memory");
-
- err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate);
- if (fpstate[0]) {
- fpregset_t fpregs;
- context_size = fpstate[1];
- fpu_version = fpstate[0];
- __asm__ volatile (".chip 68k/68881\n\t"
- "fmovemx %%fp0-%%fp7,%0\n\t"
- "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t"
- ".chip 68k"
- : "=m" (*fpregs.f_fpregs),
- "=m" (*fpregs.f_fpcntl)
- : /* no inputs */
- : "memory");
- err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
- sizeof(fpregs));
- }
- if (context_size)
- err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4,
- context_size);
- return err;
-}
-
-#endif
-
-static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
- unsigned long mask)
-{
- sc->sc_mask = mask;
- sc->sc_usp = rdusp();
- sc->sc_d0 = regs->d0;
- sc->sc_d1 = regs->d1;
- sc->sc_a0 = regs->a0;
- sc->sc_a1 = regs->a1;
- sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
- sc->sc_sr = regs->sr;
- sc->sc_pc = regs->pc;
- sc->sc_formatvec = regs->format << 12 | regs->vector;
-#ifdef CONFIG_FPU
- save_fpu_state(sc, regs);
-#endif
-}
-
-static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
-{
- struct switch_stack *sw = (struct switch_stack *)regs - 1;
- greg_t __user *gregs = uc->uc_mcontext.gregs;
- int err = 0;
-
- err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
- err |= __put_user(regs->d0, &gregs[0]);
- err |= __put_user(regs->d1, &gregs[1]);
- err |= __put_user(regs->d2, &gregs[2]);
- err |= __put_user(regs->d3, &gregs[3]);
- err |= __put_user(regs->d4, &gregs[4]);
- err |= __put_user(regs->d5, &gregs[5]);
- err |= __put_user(sw->d6, &gregs[6]);
- err |= __put_user(sw->d7, &gregs[7]);
- err |= __put_user(regs->a0, &gregs[8]);
- err |= __put_user(regs->a1, &gregs[9]);
- err |= __put_user(regs->a2, &gregs[10]);
- err |= __put_user(sw->a3, &gregs[11]);
- err |= __put_user(sw->a4, &gregs[12]);
- err |= __put_user(sw->a5, &gregs[13]);
- err |= __put_user(sw->a6, &gregs[14]);
- err |= __put_user(rdusp(), &gregs[15]);
- err |= __put_user(regs->pc, &gregs[16]);
- err |= __put_user(regs->sr, &gregs[17]);
-#ifdef CONFIG_FPU
- err |= rt_save_fpu_state(uc, regs);
-#endif
- return err;
-}
-
-static inline void __user *
-get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
-{
- unsigned long usp;
-
- /* Default to using normal stack. */
- usp = rdusp();
-
- /* This is the X/Open sanctioned signal stack switching. */
- if (ka->sa.sa_flags & SA_ONSTACK) {
- if (!sas_ss_flags(usp))
- usp = current->sas_ss_sp + current->sas_ss_size;
- }
- return (void __user *)((usp - frame_size) & -8UL);
-}
-
-static int setup_frame (int sig, struct k_sigaction *ka,
- sigset_t *set, struct pt_regs *regs)
-{
- struct sigframe __user *frame;
- struct sigcontext context;
- int err = 0;
-
- frame = get_sigframe(ka, regs, sizeof(*frame));
-
- err |= __put_user((current_thread_info()->exec_domain
- && current_thread_info()->exec_domain->signal_invmap
- && sig < 32
- ? current_thread_info()->exec_domain->signal_invmap[sig]
- : sig),
- &frame->sig);
-
- err |= __put_user(regs->vector, &frame->code);
- err |= __put_user(&frame->sc, &frame->psc);
-
- if (_NSIG_WORDS > 1)
- err |= copy_to_user(frame->extramask, &set->sig[1],
- sizeof(frame->extramask));
-
- setup_sigcontext(&context, regs, set->sig[0]);
- err |= copy_to_user (&frame->sc, &context, sizeof(context));
-
- /* Set up to return from userspace. */
- err |= __put_user((void *) ret_from_user_signal, &frame->pretcode);
-
- if (err)
- goto give_sigsegv;
-
- /* Set up registers for signal handler */
- wrusp ((unsigned long) frame);
- regs->pc = (unsigned long) ka->sa.sa_handler;
- ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
- regs->format = 0x4; /*set format byte to make stack appear modulo 4
- which it will be when doing the rte */
-
-adjust_stack:
- /* Prepare to skip over the extra stuff in the exception frame. */
- if (regs->stkadj) {
- struct pt_regs *tregs =
- (struct pt_regs *)((ulong)regs + regs->stkadj);
-#if defined(DEBUG)
- printk(KERN_DEBUG "Performing stackadjust=%04x\n", regs->stkadj);
-#endif
- /* This must be copied with decreasing addresses to
- handle overlaps. */
- tregs->vector = 0;
- tregs->format = 0;
- tregs->pc = regs->pc;
- tregs->sr = regs->sr;
- }
- return err;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- goto adjust_stack;
-}
-
-static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
-{
- struct rt_sigframe __user *frame;
- int err = 0;
-
- frame = get_sigframe(ka, regs, sizeof(*frame));
-
- err |= __put_user((current_thread_info()->exec_domain
- && current_thread_info()->exec_domain->signal_invmap
- && sig < 32
- ? current_thread_info()->exec_domain->signal_invmap[sig]
- : sig),
- &frame->sig);
- err |= __put_user(&frame->info, &frame->pinfo);
- err |= __put_user(&frame->uc, &frame->puc);
- err |= copy_siginfo_to_user(&frame->info, info);
-
- /* Create the ucontext. */
- err |= __put_user(0, &frame->uc.uc_flags);
- err |= __put_user(NULL, &frame->uc.uc_link);
- err |= __put_user((void __user *)current->sas_ss_sp,
- &frame->uc.uc_stack.ss_sp);
- err |= __put_user(sas_ss_flags(rdusp()),
- &frame->uc.uc_stack.ss_flags);
- err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
- err |= rt_setup_ucontext(&frame->uc, regs);
- err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
-
- /* Set up to return from userspace. */
- err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode);
-
- if (err)
- goto give_sigsegv;
-
- /* Set up registers for signal handler */
- wrusp ((unsigned long) frame);
- regs->pc = (unsigned long) ka->sa.sa_handler;
- ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
- regs->format = 0x4; /*set format byte to make stack appear modulo 4
- which it will be when doing the rte */
-
-adjust_stack:
- /* Prepare to skip over the extra stuff in the exception frame. */
- if (regs->stkadj) {
- struct pt_regs *tregs =
- (struct pt_regs *)((ulong)regs + regs->stkadj);
-#if defined(DEBUG)
- printk(KERN_DEBUG "Performing stackadjust=%04x\n", regs->stkadj);
-#endif
- /* This must be copied with decreasing addresses to
- handle overlaps. */
- tregs->vector = 0;
- tregs->format = 0;
- tregs->pc = regs->pc;
- tregs->sr = regs->sr;
- }
- return err;
-
-give_sigsegv:
- force_sigsegv(sig, current);
- goto adjust_stack;
-}
-
-static inline void
-handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
-{
- switch (regs->d0) {
- case -ERESTARTNOHAND:
- if (!has_handler)
- goto do_restart;
- regs->d0 = -EINTR;
- break;
-
- case -ERESTART_RESTARTBLOCK:
- if (!has_handler) {
- regs->d0 = __NR_restart_syscall;
- regs->pc -= 2;
- break;
- }
- regs->d0 = -EINTR;
- break;
-
- case -ERESTARTSYS:
- if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
- regs->d0 = -EINTR;
- break;
- }
- /* fallthrough */
- case -ERESTARTNOINTR:
- do_restart:
- regs->d0 = regs->orig_d0;
- regs->pc -= 2;
- break;
- }
-}
-
-/*
- * OK, we're invoking a handler
- */
-static void
-handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *oldset, struct pt_regs *regs)
-{
- int err;
- /* are we from a system call? */
- if (regs->orig_d0 >= 0)
- /* If so, check system call restarting.. */
- handle_restart(regs, ka, 1);
-
- /* set up the stack frame */
- if (ka->sa.sa_flags & SA_SIGINFO)
- err = setup_rt_frame(sig, ka, info, oldset, regs);
- else
- err = setup_frame(sig, ka, oldset, regs);
-
- if (err)
- return;
-
- spin_lock_irq(¤t->sighand->siglock);
- sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
- if (!(ka->sa.sa_flags & SA_NODEFER))
- sigaddset(¤t->blocked,sig);
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- clear_thread_flag(TIF_RESTORE_SIGMASK);
-}
-
-/*
- * Note that 'init' is a special process: it doesn't get signals it doesn't
- * want to handle. Thus you cannot kill init even with a SIGKILL even by
- * mistake.
- */
-asmlinkage void do_signal(struct pt_regs *regs)
-{
- struct k_sigaction ka;
- siginfo_t info;
- int signr;
- sigset_t *oldset;
-
- /*
- * We want the common case to go fast, which
- * is why we may in certain cases get here from
- * kernel mode. Just return without doing anything
- * if so.
- */
- if (!user_mode(regs))
- return;
-
- if (test_thread_flag(TIF_RESTORE_SIGMASK))
- oldset = ¤t->saved_sigmask;
- else
- oldset = ¤t->blocked;
-
- signr = get_signal_to_deliver(&info, &ka, regs, NULL);
- if (signr > 0) {
- /* Whee! Actually deliver the signal. */
- handle_signal(signr, &ka, &info, oldset, regs);
- return;
- }
-
- /* Did we come from a system call? */
- if (regs->orig_d0 >= 0) {
- /* Restart the system call - no handlers present */
- handle_restart(regs, NULL, 0);
- }
-
- /* If there's no signal to deliver, we just restore the saved mask. */
- if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
- clear_thread_flag(TIF_RESTORE_SIGMASK);
- sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
- }
-}
--
1.7.0.4
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