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Subject[PATCH] H8/300 signal handling update
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>

diff -Nru a/arch/h8300/kernel/signal.c b/arch/h8300/kernel/signal.c
--- a/arch/h8300/kernel/signal.c 2004-11-13 01:12:50 +09:00
+++ b/arch/h8300/kernel/signal.c 2004-11-13 01:12:50 +09:00
@@ -38,6 +38,7 @@
#include <linux/personality.h>
#include <linux/tty.h>
#include <linux/binfmts.h>
+#include <linux/suspend.h>

#include <asm/setup.h>
#include <asm/uaccess.h>
@@ -47,7 +48,7 @@

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

-asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
+asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);

/*
* Atomically swap in the new signal mask, and wait for a signal.
@@ -68,7 +69,7 @@
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
- if (do_signal(&saveset, regs))
+ if (do_signal(regs, &saveset))
return -EINTR;
}
}
@@ -98,7 +99,7 @@
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
- if (do_signal(&saveset, regs))
+ if (do_signal(regs, &saveset))
return -EINTR;
}
}
@@ -161,6 +162,7 @@
unsigned char retcode[8];
unsigned long extramask[_NSIG_WORDS-1];
struct sigcontext sc;
+ int sig;
} __attribute__((aligned(2),packed));

struct rt_sigframe
@@ -172,73 +174,44 @@
#endif
long dummy_pc;
char *pretcode;
+ struct siginfo *pinfo;
+ void *puc;
unsigned char retcode[8];
struct siginfo info;
struct ucontext uc;
+ int sig;
} __attribute__((aligned(2),packed));

static inline int
-restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc, void *fp,
+restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc,
int *pd0)
{
- struct sigcontext context;
int err = 0;
-
- /* get previous context */
- if (copy_from_user(&context, usc, sizeof(context)))
- goto badframe;
-
- /* restore passed registers */
- regs->er1 = context.sc_er1;
- regs->er2 = context.sc_er2;
- regs->er3 = context.sc_er3;
- regs->er5 = context.sc_er5;
- regs->ccr = (regs->ccr & 0x10)|(context.sc_ccr & 0xef);
- regs->pc = context.sc_pc;
+ unsigned int ccr;
+ unsigned int usp;
+ unsigned int er0;
+
+ /* Always make any pending restarted system calls return -EINTR */
+ current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+#define COPY(r) err |= __get_user(regs->r, &usc->sc_##r) /* restore passed registers */
+ COPY(er1);
+ COPY(er2);
+ COPY(er3);
+ COPY(er5);
+ COPY(pc);
+ ccr = regs->ccr & 0x10;
+ COPY(ccr);
+#undef COPY
+ regs->ccr &= 0xef;
+ regs->ccr |= ccr;
regs->orig_er0 = -1; /* disable syscall checks */
- wrusp(context.sc_usp);
-
- *pd0 = context.sc_er0;
- return err;
-
-badframe:
- return 1;
-}
-
-static inline int
-rt_restore_ucontext(struct pt_regs *regs, struct ucontext *uc, int *pd0)
-{
- int temp;
- greg_t *gregs = uc->uc_mcontext.gregs;
- unsigned long usp;
- int err;
-
- err = __get_user(temp, &uc->uc_mcontext.version);
- if (temp != MCONTEXT_VERSION)
- goto badframe;
- /* restore passed registers */
- err |= __get_user(regs->er0, &gregs[0]);
- err |= __get_user(regs->er1, &gregs[1]);
- err |= __get_user(regs->er2, &gregs[2]);
- err |= __get_user(regs->er3, &gregs[3]);
- err |= __get_user(regs->er4, &gregs[4]);
- err |= __get_user(regs->er5, &gregs[5]);
- err |= __get_user(regs->er6, &gregs[6]);
- err |= __get_user(usp, &gregs[7]);
+ err |= __get_user(usp, &usc->sc_usp);
wrusp(usp);
- err |= __get_user(regs->pc, &gregs[8]);
- err |= __get_user(temp, &gregs[9]);
- regs->ccr = (regs->ccr & 0x10) | (temp & 0xef);
- regs->orig_er0 = -1; /* disable syscall checks */

- if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
- goto badframe;
-
- *pd0 = regs->er0;
+ err |= __get_user(er0, &usc->sc_er0);
+ *pd0 = er0;
return err;
-
-badframe:
- return 1;
}

asmlinkage int do_sigreturn(unsigned long __unused,...)
@@ -263,7 +236,7 @@
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);

- if (restore_sigcontext(regs, &frame->sc, frame + 1, &er0))
+ if (restore_sigcontext(regs, &frame->sc, &er0))
goto badframe;
return er0;

@@ -291,8 +264,12 @@
recalc_sigpending();
spin_lock_irq(&current->sighand->siglock);

- if (rt_restore_ucontext(regs, &frame->uc, &er0))
+ if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &er0))
+ goto badframe;
+
+ if (do_sigaltstack(&frame->uc.uc_stack, NULL, usp) == -EFAULT)
goto badframe;
+
return er0;

badframe:
@@ -300,36 +277,23 @@
return 0;
}

-static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
+static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
unsigned long mask)
{
- sc->sc_mask = mask;
- sc->sc_usp = rdusp();
- sc->sc_er0 = regs->er0;
- sc->sc_er1 = regs->er1;
- sc->sc_er2 = regs->er2;
- sc->sc_er3 = regs->er3;
- sc->sc_er5 = regs->er5;
- sc->sc_ccr = regs->ccr;
- sc->sc_pc = regs->pc;
-}
-
-static inline int rt_setup_ucontext(struct ucontext *uc, struct pt_regs *regs)
-{
- greg_t *gregs = uc->uc_mcontext.gregs;
int err = 0;

- err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
- err |= __put_user(regs->er0, &gregs[0]);
- err |= __put_user(regs->er1, &gregs[1]);
- err |= __put_user(regs->er2, &gregs[2]);
- err |= __put_user(regs->er3, &gregs[3]);
- err |= __put_user(regs->er4, &gregs[4]);
- err |= __put_user(regs->er5, &gregs[5]);
- err |= __put_user(regs->er6, &gregs[6]);
- err |= __put_user(rdusp(), &gregs[7]);
- err |= __put_user(regs->pc, &gregs[8]);
- err |= __put_user(regs->ccr, &gregs[9]);
+ err |= __put_user(regs->er0, &sc->sc_er0);
+ err |= __put_user(regs->er1, &sc->sc_er1);
+ err |= __put_user(regs->er2, &sc->sc_er2);
+ err |= __put_user(regs->er3, &sc->sc_er3);
+ err |= __put_user(regs->er4, &sc->sc_er4);
+ err |= __put_user(regs->er5, &sc->sc_er5);
+ err |= __put_user(regs->er6, &sc->sc_er6);
+ err |= __put_user(rdusp(), &sc->sc_usp);
+ err |= __put_user(regs->pc, &sc->sc_pc);
+ err |= __put_user(regs->ccr, &sc->sc_ccr);
+ err |= __put_user(mask, &sc->sc_mask);
+
return err;
}

@@ -353,26 +317,48 @@
sigset_t *set, struct pt_regs *regs)
{
struct sigframe *frame;
- struct sigcontext context;
int err = 0;
+ int usig;
+ unsigned char *ret;

frame = get_sigframe(ka, regs, sizeof(*frame));

- if (_NSIG_WORDS > 1)
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ goto give_sigsegv;
+
+ usig = current_thread_info()->exec_domain
+ && current_thread_info()->exec_domain->signal_invmap
+ && sig < 32
+ ? current_thread_info()->exec_domain->signal_invmap[sig]
+ : sig;
+
+ err |= __put_user(usig, &frame->sig);
+ if (err)
+ goto give_sigsegv;
+
+ err |= setup_sigcontext(&frame->sc, regs, set->sig[0]);
+ if (err)
+ goto give_sigsegv;
+
+ if (_NSIG_WORDS > 1) {
err |= copy_to_user(frame->extramask, &set->sig[1],
sizeof(frame->extramask));
+ if (err)
+ goto give_sigsegv;
+ }

- setup_sigcontext(&context, regs, set->sig[0]);
- err |= copy_to_user (&frame->sc, &context, sizeof(context));
+ ret = frame->retcode;
+ if (ka->sa.sa_flags & SA_RESTORER)
+ ret = (unsigned char *)(ka->sa.sa_restorer);
+ else {
+ /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
+ err != __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
+ (unsigned long *)(frame->retcode + 0));
+ err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
+ }

/* Set up to return from userspace. */
- err |= __put_user(frame->retcode, &frame->pretcode);
-
- /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
- err != __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
- (unsigned long *)(frame->retcode + 0));
- err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
-
+ err |= __put_user(ret, &frame->pretcode);

if (err)
goto give_sigsegv;
@@ -399,10 +385,29 @@
{
struct rt_sigframe *frame;
int err = 0;
+ int usig;
+ unsigned char *ret;

frame = get_sigframe(ka, regs, sizeof(*frame));

+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ goto give_sigsegv;
+
+ usig = current_thread_info()->exec_domain
+ && current_thread_info()->exec_domain->signal_invmap
+ && sig < 32
+ ? current_thread_info()->exec_domain->signal_invmap[sig]
+ : sig;
+
+ err |= __put_user(usig, &frame->sig);
+ if (err)
+ goto give_sigsegv;
+
+ err |= __put_user(&frame->info, &frame->pinfo);
+ err |= __put_user(&frame->uc, &frame->puc);
err |= copy_siginfo_to_user(&frame->info, info);
+ if (err)
+ goto give_sigsegv;

/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
@@ -412,16 +417,22 @@
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 |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0]);
err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
+ if (err)
+ goto give_sigsegv;

/* Set up to return from userspace. */
- err |= __put_user(frame->retcode, &frame->pretcode);
-
- /* sub.l er0,er0; mov.b #__NR_rt_sigreturn,r0l; trapa #0 */
- err != __put_user(0x1a80f800 + (__NR_rt_sigreturn & 0xff),
- (long *)(frame->retcode + 0));
- err |= __put_user(0x5700, (short *)(frame->retcode + 4));
+ ret = frame->retcode;
+ if (ka->sa.sa_flags & SA_RESTORER)
+ ret = (unsigned char *)(ka->sa.sa_restorer);
+ else {
+ /* sub.l er0,er0; mov.b #__NR_sigreturn,r0l; trapa #0 */
+ err != __put_user(0x1a80f800 + (__NR_sigreturn & 0xff),
+ (unsigned long *)(frame->retcode + 0));
+ err |= __put_user(0x5700, (unsigned short *)(frame->retcode + 4));
+ }
+ err |= __put_user(ret, &frame->pretcode);

if (err)
goto give_sigsegv;
@@ -444,41 +455,32 @@
force_sigsegv(sig, current);
}

-static inline void
-handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
-{
- switch (regs->er0) {
- case -ERESTARTNOHAND:
- if (!has_handler)
- goto do_restart;
- regs->er0 = -EINTR;
- break;
-
- case -ERESTARTSYS:
- if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
- regs->er0 = -EINTR;
- break;
- }
- /* fallthrough */
- case -ERESTARTNOINTR:
- do_restart:
- regs->er0 = regs->orig_er0;
- 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)
+handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
+ sigset_t *oldset, struct pt_regs * regs)
{
/* are we from a system call? */
- if (regs->orig_er0 >= 0)
- /* If so, check system call restarting.. */
- handle_restart(regs, ka, 1);
+ if (regs->orig_er0 >= 0) {
+ switch (regs->er0) {
+ case -ERESTART_RESTARTBLOCK:
+ case -ERESTARTNOHAND:
+ regs->er0 = -EINTR;
+ break;
+
+ case -ERESTARTSYS:
+ if (!(ka->sa.sa_flags & SA_RESTART)) {
+ regs->er0 = -EINTR;
+ break;
+ }
+ /* fallthrough */
+ case -ERESTARTNOINTR:
+ regs->er0 = regs->orig_er0;
+ regs->pc -= 2;
+ }
+ }

/* set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
@@ -486,9 +488,6 @@
else
setup_frame(sig, ka, oldset, regs);

- if (ka->sa.sa_flags & SA_ONESHOT)
- ka->sa.sa_handler = SIG_DFL;
-
if (!(ka->sa.sa_flags & SA_NODEFER)) {
spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
@@ -502,137 +501,52 @@
* 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.
- *
- * Note that we go through the signals twice: once to check the signals
- * that the kernel can handle, and then we build all the user-level signal
- * handling stack-frames in one go after that.
*/
-asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
+asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset)
{
siginfo_t info;
- struct k_sigaction *ka;
+ int signr;
+ struct k_sigaction ka;
+
+ /*
+ * 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 ((regs->ccr & 0x10))
+ return 1;
+
+ if (current->flags & PF_FREEZE) {
+ refrigerator(0);
+ goto no_signal;
+ }

current->thread.esp0 = (unsigned long) regs;

if (!oldset)
oldset = &current->blocked;

- for (;;) {
- int signr;
-
- signr = get_signal_to_deliver(&info, regs, NULL);
-
- if (!signr)
- break;
-
- if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
- current->exit_code = signr;
- current->state = TASK_STOPPED;
-
- /* Did we come from a system call? */
- if (regs->orig_er0 >= 0) {
- /* Restart the system call the same way as
- if the process were not traced. */
- struct k_sigaction *ka =
- &current->sighand->action[signr-1];
- int has_handler =
- (ka->sa.sa_handler != SIG_IGN &&
- ka->sa.sa_handler != SIG_DFL);
- handle_restart(regs, ka, has_handler);
- }
- notify_parent(current, SIGCHLD);
- schedule();
-
- /* We're back. Did the debugger cancel the sig? */
- if (!(signr = current->exit_code)) {
- discard_frame:
- continue;
- }
- current->exit_code = 0;
-
- /* The debugger continued. Ignore SIGSTOP. */
- if (signr == SIGSTOP)
- goto discard_frame;
-
- /* Update the siginfo structure. Is this good? */
- if (signr != info.si_signo) {
- info.si_signo = signr;
- info.si_errno = 0;
- info.si_code = SI_USER;
- info.si_pid = current->parent->pid;
- info.si_uid = current->parent->uid;
- }
-
- /* If the (new) signal is now blocked, requeue it. */
- if (sigismember(&current->blocked, signr)) {
- send_sig_info(signr, &info, current);
- continue;
- }
- }
-
- ka = &current->sighand->action[signr-1];
- if (ka->sa.sa_handler == SIG_IGN) {
- if (signr != SIGCHLD)
- continue;
- /* Check for SIGCHLD: it's special. */
- while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0)
- /* nothing */;
- continue;
- }
-
- if (ka->sa.sa_handler == SIG_DFL) {
- int exit_code = signr;
-
- if (current->pid == 1)
- continue;
-
- switch (signr) {
- case SIGCONT: case SIGCHLD:
- case SIGWINCH: case SIGURG:
- continue;
-
- case SIGTSTP: case SIGTTIN: case SIGTTOU:
- if (is_orphaned_pgrp(process_group(current)))
- continue;
- /* FALLTHRU */
-
- case SIGSTOP: {
- struct sighand_struct *sig;
- current->state = TASK_STOPPED;
- current->exit_code = signr;
- sig = current->parent->sighand;
- if (sig && !(sig->action[SIGCHLD-1].sa.sa_flags
-& SA_NOCLDSTOP))
- notify_parent(current, SIGCHLD);
- schedule();
- continue;
- }
-
- case SIGQUIT: case SIGILL: case SIGTRAP:
- case SIGIOT: case SIGFPE: case SIGSEGV:
- case SIGBUS: case SIGSYS: case SIGXCPU: case SIGXFSZ:
- if (do_coredump(signr, exit_code, regs))
- exit_code |= 0x80;
- /* FALLTHRU */
-
- default:
- sigaddset(&current->pending.signal, signr);
- recalc_sigpending();
- current->flags |= PF_SIGNALED;
- do_exit(exit_code);
- /* NOTREACHED */
- }
- }
-
+ signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+ if (signr > 0) {
/* Whee! Actually deliver the signal. */
- handle_signal(signr, ka, &info, oldset, regs);
+ handle_signal(signr, &info, &ka, oldset, regs);
return 1;
}
-
+ no_signal:
/* Did we come from a system call? */
- if (regs->orig_er0 >= 0)
+ if (regs->orig_er0 >= 0) {
/* Restart the system call - no handlers present */
- handle_restart(regs, NULL, 0);
-
+ if (regs->er0 == -ERESTARTNOHAND ||
+ regs->er0 == -ERESTARTSYS ||
+ regs->er0 == -ERESTARTNOINTR) {
+ regs->er0 = regs->orig_er0;
+ regs->pc -= 2;
+ }
+ if (regs->er0 == -ERESTART_RESTARTBLOCK){
+ regs->er0 = __NR_restart_syscall;
+ regs->pc -= 2;
+ }
+ }
return 0;
}
diff -Nru a/arch/h8300/platform/h8300h/entry.S b/arch/h8300/platform/h8300h/entry.S
--- a/arch/h8300/platform/h8300h/entry.S 2004-11-13 01:12:50 +09:00
+++ b/arch/h8300/platform/h8300h/entry.S 2004-11-13 01:12:50 +09:00
@@ -247,9 +247,9 @@
mov.l @(TI_FLAGS:16,er4),er1
btst #TIF_NEED_RESCHED,r1l
bne SYMBOL_NAME(reschedule):16
- mov.l sp,er1
- subs #4,er1 /* adjust retpc */
- mov.l er2,er0
+ mov.l sp,er0
+ subs #4,er0 /* adjust retpc */
+ mov.l er2,er1
jsr @SYMBOL_NAME(do_signal)
#if defined(CONFIG_PREEMPT)
bra done:8 /* userspace thoru */
diff -Nru a/arch/h8300/platform/h8s/entry.S b/arch/h8300/platform/h8s/entry.S
--- a/arch/h8300/platform/h8s/entry.S 2004-11-13 01:12:50 +09:00
+++ b/arch/h8300/platform/h8s/entry.S 2004-11-13 01:12:50 +09:00
@@ -244,9 +244,9 @@
mov.l @(TI_FLAGS:16,er4),er1
btst #TIF_NEED_RESCHED,r1l
bne SYMBOL_NAME(reschedule):16
- mov.l sp,er1
- subs #4,er1 /* adjust retpc */
- mov.l er2,er0
+ mov.l sp,er0
+ subs #4,er0 /* adjust retpc */
+ mov.l er2,er1
jsr @SYMBOL_NAME(do_signal)
#if defined(CONFIG_PREEMPT)
bra done:8 /* userspace thoru */
diff -Nru a/include/asm-h8300/sigcontext.h b/include/asm-h8300/sigcontext.h
--- a/include/asm-h8300/sigcontext.h 2004-11-13 01:12:50 +09:00
+++ b/include/asm-h8300/sigcontext.h 2004-11-13 01:12:50 +09:00
@@ -8,7 +8,9 @@
unsigned long sc_er1;
unsigned long sc_er2;
unsigned long sc_er3;
+ unsigned long sc_er4;
unsigned long sc_er5;
+ unsigned long sc_er6;
unsigned short sc_ccr;
unsigned long sc_pc;
};
diff -Nru a/include/asm-h8300/signal.h b/include/asm-h8300/signal.h
--- a/include/asm-h8300/signal.h 2004-11-13 01:12:50 +09:00
+++ b/include/asm-h8300/signal.h 2004-11-13 01:12:50 +09:00
@@ -96,6 +96,8 @@
#define SA_ONESHOT SA_RESETHAND
#define SA_INTERRUPT 0x20000000 /* dummy -- ignored */

+#define SA_RESTORER 0x04000000
+
/*
* sigaltstack controls
*/
diff -Nru a/include/asm-h8300/ucontext.h b/include/asm-h8300/ucontext.h
--- a/include/asm-h8300/ucontext.h 2004-11-13 01:12:50 +09:00
+++ b/include/asm-h8300/ucontext.h 2004-11-13 01:12:50 +09:00
@@ -1,22 +1,11 @@
#ifndef _H8300_UCONTEXT_H
#define _H8300_UCONTEXT_H

-typedef int greg_t;
-#define NGREG 10
-typedef greg_t gregset_t[NGREG];
-
-struct mcontext {
- int version;
- gregset_t gregs;
-};
-
-#define MCONTEXT_VERSION 1
-
struct ucontext {
unsigned long uc_flags;
struct ucontext *uc_link;
stack_t uc_stack;
- struct mcontext uc_mcontext;
+ struct sigcontext uc_mcontext;
sigset_t uc_sigmask; /* mask last for extensibility */
};

diff -Nru a/include/asm-h8300/unistd.h b/include/asm-h8300/unistd.h
--- a/include/asm-h8300/unistd.h 2004-11-13 01:12:50 +09:00
+++ b/include/asm-h8300/unistd.h 2004-11-13 01:12:50 +09:00
@@ -5,6 +5,7 @@
* This file contains the system call numbers.
*/

+#define __NR_restart_syscall 0
#define __NR_exit 1
#define __NR_fork 2
#define __NR_read 3
--
Yoshinori Sato
<ysato@users.sourceforge.jp>
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