-/* $Id: signal32.c,v 1.74 2002/02/09 19:49:30 davem Exp $
- * arch/sparc64/kernel/signal32.c
+/* arch/sparc64/kernel/signal32.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-/* Signal frames: the original one (compatible with SunOS):
- *
- * Set up a signal frame... Make the stack look the way SunOS
- * expects it to look which is basically:
- *
- * ---------------------------------- <-- %sp at signal time
- * Struct sigcontext
- * Signal address
- * Ptr to sigcontext area above
- * Signal code
- * The signal number itself
- * One register window
- * ---------------------------------- <-- New %sp
- */
-struct signal_sframe32 {
- struct reg_window32 sig_window;
- int sig_num;
- int sig_code;
- /* struct sigcontext32 * */ u32 sig_scptr;
- int sig_address;
- struct sigcontext32 sig_context;
- unsigned int extramask[_COMPAT_NSIG_WORDS - 1];
-};
-
/* This magic should be in g_upper[0] for all upper parts
* to be valid.
*/
unsigned int asi;
} siginfo_extra_v8plus_t;
-/*
- * And the new one, intended to be used for Linux applications only
- * (we have enough in there to work with clone).
- * All the interesting bits are in the info field.
- */
-struct new_signal_frame32 {
+struct signal_frame32 {
struct sparc_stackf32 ss;
__siginfo32_t info;
/* __siginfo_fpu32_t * */ u32 fpu_save;
};
/* Align macros */
-#define SF_ALIGNEDSZ (((sizeof(struct signal_sframe32) + 7) & (~7)))
-#define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame32) + 7) & (~7)))
+#define SF_ALIGNEDSZ (((sizeof(struct signal_frame32) + 7) & (~7)))
#define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame32) + 7) & (~7)))
int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
return err;
}
-void do_new_sigreturn32(struct pt_regs *regs)
+void do_sigreturn32(struct pt_regs *regs)
{
- struct new_signal_frame32 __user *sf;
+ struct signal_frame32 __user *sf;
unsigned int psr;
unsigned pc, npc, fpu_save;
sigset_t set;
unsigned seta[_COMPAT_NSIG_WORDS];
int err, i;
+ /* Always make any pending restarted system calls return -EINTR */
+ current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+ synchronize_user_stack();
+
regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
- sf = (struct new_signal_frame32 __user *) regs->u_regs[UREG_FP];
+ sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
/* 1. Make sure we are not getting garbage from the user */
if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
regs->tstate |= psr_to_tstate_icc(psr);
+ /* Prevent syscall restart. */
+ pt_regs_clear_syscall(regs);
+
err |= __get_user(fpu_save, &sf->fpu_save);
if (fpu_save)
err |= restore_fpu_state32(regs, &sf->fpu_state);
force_sig(SIGSEGV, current);
}
-asmlinkage void do_sigreturn32(struct pt_regs *regs)
-{
- struct sigcontext32 __user *scptr;
- unsigned int pc, npc, psr;
- sigset_t set;
- unsigned int seta[_COMPAT_NSIG_WORDS];
- int err;
-
- /* Always make any pending restarted system calls return -EINTR */
- current_thread_info()->restart_block.fn = do_no_restart_syscall;
-
- synchronize_user_stack();
- if (test_thread_flag(TIF_NEWSIGNALS)) {
- do_new_sigreturn32(regs);
- return;
- }
-
- scptr = (struct sigcontext32 __user *)
- (regs->u_regs[UREG_I0] & 0x00000000ffffffffUL);
- /* Check sanity of the user arg. */
- if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext32)) ||
- (((unsigned long) scptr) & 3))
- goto segv;
-
- err = __get_user(pc, &scptr->sigc_pc);
- err |= __get_user(npc, &scptr->sigc_npc);
-
- if ((pc | npc) & 3)
- goto segv; /* Nice try. */
-
- err |= __get_user(seta[0], &scptr->sigc_mask);
- /* Note that scptr + 1 points to extramask */
- err |= copy_from_user(seta+1, scptr + 1,
- (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
- if (err)
- goto segv;
- switch (_NSIG_WORDS) {
- case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32);
- case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32);
- case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32);
- case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32);
- }
- sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(¤t->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- if (test_thread_flag(TIF_32BIT)) {
- pc &= 0xffffffff;
- npc &= 0xffffffff;
- }
- regs->tpc = pc;
- regs->tnpc = npc;
- err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp);
- err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0);
- err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1);
-
- /* User can only change condition codes in %tstate. */
- err |= __get_user(psr, &scptr->sigc_psr);
- if (err)
- goto segv;
- regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
- regs->tstate |= psr_to_tstate_icc(psr);
- return;
-
-segv:
- force_sig(SIGSEGV, current);
-}
-
asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
{
struct rt_signal_frame32 __user *sf;
regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC);
regs->tstate |= psr_to_tstate_icc(psr);
+ /* Prevent syscall restart. */
+ pt_regs_clear_syscall(regs);
+
err |= __get_user(fpu_save, &sf->fpu_save);
if (fpu_save)
err |= restore_fpu_state32(regs, &sf->fpu_state);
regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL;
sp = regs->u_regs[UREG_FP];
+ /*
+ * If we are on the alternate signal stack and would overflow it, don't.
+ * Return an always-bogus address instead so we will die with SIGSEGV.
+ */
+ if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
+ return (void __user *) -1L;
+
/* This is the X/Open sanctioned signal stack switching. */
if (sa->sa_flags & SA_ONSTACK) {
- if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
+ if (sas_ss_flags(sp) == 0)
sp = current->sas_ss_sp + current->sas_ss_size;
}
- return (void __user *)(sp - framesize);
-}
-
-static void
-setup_frame32(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
-{
- struct signal_sframe32 __user *sframep;
- struct sigcontext32 __user *sc;
- unsigned int seta[_COMPAT_NSIG_WORDS];
- int err = 0;
- void __user *sig_address;
- int sig_code;
- unsigned long pc = regs->tpc;
- unsigned long npc = regs->tnpc;
- unsigned int psr;
-
- if (test_thread_flag(TIF_32BIT)) {
- pc &= 0xffffffff;
- npc &= 0xffffffff;
- }
-
- synchronize_user_stack();
- save_and_clear_fpu();
-
- sframep = (struct signal_sframe32 __user *)
- get_sigframe(sa, regs, SF_ALIGNEDSZ);
- if (invalid_frame_pointer(sframep, sizeof(*sframep))){
- /* Don't change signal code and address, so that
- * post mortem debuggers can have a look.
- */
- do_exit(SIGILL);
- }
-
- sc = &sframep->sig_context;
-
- /* We've already made sure frame pointer isn't in kernel space... */
- err = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK),
- &sc->sigc_onstack);
-
- switch (_NSIG_WORDS) {
- case 4: seta[7] = (oldset->sig[3] >> 32);
- seta[6] = oldset->sig[3];
- case 3: seta[5] = (oldset->sig[2] >> 32);
- seta[4] = oldset->sig[2];
- case 2: seta[3] = (oldset->sig[1] >> 32);
- seta[2] = oldset->sig[1];
- case 1: seta[1] = (oldset->sig[0] >> 32);
- seta[0] = oldset->sig[0];
- }
- err |= __put_user(seta[0], &sc->sigc_mask);
- err |= __copy_to_user(sframep->extramask, seta + 1,
- (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int));
- err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp);
- err |= __put_user(pc, &sc->sigc_pc);
- err |= __put_user(npc, &sc->sigc_npc);
- psr = tstate_to_psr(regs->tstate);
- if (current_thread_info()->fpsaved[0] & FPRS_FEF)
- psr |= PSR_EF;
- err |= __put_user(psr, &sc->sigc_psr);
- err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
- err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
- err |= __put_user(get_thread_wsaved(), &sc->sigc_oswins);
-
- err |= copy_in_user((u32 __user *)sframep,
- (u32 __user *)(regs->u_regs[UREG_FP]),
- sizeof(struct reg_window32));
-
- set_thread_wsaved(0); /* So process is allowed to execute. */
- err |= __put_user(signr, &sframep->sig_num);
- sig_address = NULL;
- sig_code = 0;
- if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) {
- sig_address = info->si_addr;
- switch (signr) {
- case SIGSEGV:
- switch (info->si_code) {
- case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break;
- default: sig_code = SUBSIG_PROTECTION; break;
- }
- break;
- case SIGILL:
- switch (info->si_code) {
- case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break;
- case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break;
- case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break;
- default: sig_code = SUBSIG_STACK; break;
- }
- break;
- case SIGFPE:
- switch (info->si_code) {
- case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break;
- case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break;
- case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break;
- case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break;
- case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break;
- case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break;
- case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break;
- default: sig_code = SUBSIG_FPERROR; break;
- }
- break;
- case SIGBUS:
- switch (info->si_code) {
- case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break;
- case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break;
- default: sig_code = SUBSIG_BUSTIMEOUT; break;
- }
- break;
- case SIGEMT:
- switch (info->si_code) {
- case EMT_TAGOVF: sig_code = SUBSIG_TAG; break;
- }
- break;
- case SIGSYS:
- if (info->si_code == (__SI_FAULT|0x100)) {
- /* See sys_sunos32.c */
- sig_code = info->si_trapno;
- break;
- }
- default:
- sig_address = NULL;
- }
- }
- err |= __put_user(ptr_to_compat(sig_address), &sframep->sig_address);
- err |= __put_user(sig_code, &sframep->sig_code);
- err |= __put_user(ptr_to_compat(sc), &sframep->sig_scptr);
- if (err)
- goto sigsegv;
- regs->u_regs[UREG_FP] = (unsigned long) sframep;
- regs->tpc = (unsigned long) sa->sa_handler;
- regs->tnpc = (regs->tpc + 4);
- if (test_thread_flag(TIF_32BIT)) {
- regs->tpc &= 0xffffffff;
- regs->tnpc &= 0xffffffff;
- }
- return;
+ /* Always align the stack frame. This handles two cases. First,
+ * sigaltstack need not be mindful of platform specific stack
+ * alignment. Second, if we took this signal because the stack
+ * is not aligned properly, we'd like to take the signal cleanly
+ * and report that.
+ */
+ sp &= ~7UL;
-sigsegv:
- force_sigsegv(signr, current);
+ return (void __user *)(sp - framesize);
}
-
static int save_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
{
unsigned long *fpregs = current_thread_info()->fpregs;
return err;
}
-static void new_setup_frame32(struct k_sigaction *ka, struct pt_regs *regs,
- int signo, sigset_t *oldset)
+static void setup_frame32(struct k_sigaction *ka, struct pt_regs *regs,
+ int signo, sigset_t *oldset)
{
- struct new_signal_frame32 __user *sf;
+ struct signal_frame32 __user *sf;
int sigframe_size;
u32 psr;
int i, err;
synchronize_user_stack();
save_and_clear_fpu();
- sigframe_size = NF_ALIGNEDSZ;
+ sigframe_size = SF_ALIGNEDSZ;
if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
sigframe_size -= sizeof(__siginfo_fpu_t);
- sf = (struct new_signal_frame32 __user *)
+ sf = (struct signal_frame32 __user *)
get_sigframe(&ka->sa, regs, sigframe_size);
if (invalid_frame_pointer(sf, sigframe_size))
{
if (ka->sa.sa_flags & SA_SIGINFO)
setup_rt_frame32(ka, regs, signr, oldset, info);
- else if (test_thread_flag(TIF_NEWSIGNALS))
- new_setup_frame32(ka, regs, signr, oldset);
else
- setup_frame32(&ka->sa, regs, signr, oldset, info);
+ setup_frame32(ka, regs, signr, oldset);
+
spin_lock_irq(¤t->sighand->siglock);
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
if (!(ka->sa.sa_flags & SA_NOMASK))
* mistake.
*/
void do_signal32(sigset_t *oldset, struct pt_regs * regs,
- struct signal_deliver_cookie *cookie)
+ int restart_syscall, unsigned long orig_i0)
{
struct k_sigaction ka;
siginfo_t info;
int signr;
- signr = get_signal_to_deliver(&info, &ka, regs, cookie);
+ signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+
+ /* If the debugger messes with the program counter, it clears
+ * the "in syscall" bit, directing us to not perform a syscall
+ * restart.
+ */
+ if (restart_syscall && !pt_regs_is_syscall(regs))
+ restart_syscall = 0;
+
if (signr > 0) {
- if (cookie->restart_syscall)
- syscall_restart32(cookie->orig_i0, regs, &ka.sa);
+ if (restart_syscall)
+ syscall_restart32(orig_i0, regs, &ka.sa);
handle_signal32(signr, &ka, &info, oldset, regs);
- /* a signal was successfully delivered; the saved
+ /* A signal was successfully delivered; the saved
* sigmask will have been stored in the signal frame,
* and will be restored by sigreturn, so we can simply
- * clear the TIF_RESTORE_SIGMASK flag.
+ * clear the TS_RESTORE_SIGMASK flag.
*/
- if (test_thread_flag(TIF_RESTORE_SIGMASK))
- clear_thread_flag(TIF_RESTORE_SIGMASK);
+ current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
return;
}
- if (cookie->restart_syscall &&
+ if (restart_syscall &&
(regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
regs->u_regs[UREG_I0] == ERESTARTSYS ||
regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
/* replay the system call when we are done */
- regs->u_regs[UREG_I0] = cookie->orig_i0;
+ regs->u_regs[UREG_I0] = orig_i0;
regs->tpc -= 4;
regs->tnpc -= 4;
}
- if (cookie->restart_syscall &&
+ if (restart_syscall &&
regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
regs->u_regs[UREG_G1] = __NR_restart_syscall;
regs->tpc -= 4;
regs->tnpc -= 4;
}
- /* if there's no signal to deliver, we just put the saved sigmask
+ /* If there's no signal to deliver, we just put the saved sigmask
* back
*/
- if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
- clear_thread_flag(TIF_RESTORE_SIGMASK);
+ if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
+ current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
}
}
git.openpandora.org / pandora-kernel.git / blobdiff