-/* $Id: signal.c,v 1.110 2002/02/08 03:57:14 davem Exp $
- * linux/arch/sparc/kernel/signal.c
+/* linux/arch/sparc/kernel/signal.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
#include <linux/smp.h>
#include <linux/binfmts.h> /* do_coredum */
#include <linux/bitops.h>
+#include <linux/tracehook.h>
#include <asm/uaccess.h>
#include <asm/ptrace.h>
void *fpqueue, unsigned long *fpqdepth);
extern void fpload(unsigned long *fpregs, unsigned long *fsr);
-/* 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_sframe {
- struct reg_window sig_window;
- int sig_num;
- int sig_code;
- struct sigcontext __user *sig_scptr;
- int sig_address;
- struct sigcontext sig_context;
- unsigned int extramask[_NSIG_WORDS - 1];
-};
-
-/*
- * 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_frame {
+struct signal_frame {
struct sparc_stackf ss;
__siginfo_t info;
__siginfo_fpu_t __user *fpu_save;
};
/* Align macros */
-#define SF_ALIGNEDSZ (((sizeof(struct signal_sframe) + 7) & (~7)))
-#define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame) + 7) & (~7)))
+#define SF_ALIGNEDSZ (((sizeof(struct signal_frame) + 7) & (~7)))
#define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
static int _sigpause_common(old_sigset_t set)
return err;
}
-static inline void do_new_sigreturn (struct pt_regs *regs)
+asmlinkage void do_sigreturn(struct pt_regs *regs)
{
- struct new_signal_frame __user *sf;
+ struct signal_frame __user *sf;
unsigned long up_psr, pc, npc;
sigset_t set;
__siginfo_fpu_t __user *fpu_save;
int err;
- sf = (struct new_signal_frame __user *) regs->u_regs[UREG_FP];
+ /* Always make any pending restarted system calls return -EINTR */
+ current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+ synchronize_user_stack();
+
+ sf = (struct signal_frame __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->psr = (up_psr & ~(PSR_ICC | PSR_EF))
| (regs->psr & (PSR_ICC | PSR_EF));
+ /* Prevent syscall restart. */
+ pt_regs_clear_syscall(regs);
+
err |= __get_user(fpu_save, &sf->fpu_save);
if (fpu_save)
force_sig(SIGSEGV, current);
}
-asmlinkage void do_sigreturn(struct pt_regs *regs)
-{
- struct sigcontext __user *scptr;
- unsigned long pc, npc, psr;
- sigset_t set;
- 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 (current->thread.new_signal) {
- do_new_sigreturn(regs);
- return;
- }
-
- scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0];
-
- /* Check sanity of the user arg. */
- if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext)) ||
- (((unsigned long) scptr) & 3))
- goto segv_and_exit;
-
- err = __get_user(pc, &scptr->sigc_pc);
- err |= __get_user(npc, &scptr->sigc_npc);
-
- if ((pc | npc) & 3)
- goto segv_and_exit;
-
- /* This is pretty much atomic, no amount locking would prevent
- * the races which exist anyways.
- */
- err |= __get_user(set.sig[0], &scptr->sigc_mask);
- /* Note that scptr + 1 points to extramask */
- err |= __copy_from_user(&set.sig[1], scptr + 1,
- (_NSIG_WORDS - 1) * sizeof(unsigned int));
-
- if (err)
- goto segv_and_exit;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
- spin_lock_irq(¤t->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_unlock_irq(¤t->sighand->siglock);
-
- regs->pc = pc;
- regs->npc = 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 %psr. */
- err |= __get_user(psr, &scptr->sigc_psr);
- if (err)
- goto segv_and_exit;
-
- regs->psr &= ~(PSR_ICC);
- regs->psr |= (psr & PSR_ICC);
- return;
-
-segv_and_exit:
- force_sig(SIGSEGV, current);
-}
-
asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
{
struct rt_signal_frame __user *sf;
regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
+ /* Prevent syscall restart. */
+ pt_regs_clear_syscall(regs);
+
err |= __get_user(fpu_save, &sf->fpu_save);
if (fpu_save)
static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
{
- unsigned long sp;
+ unsigned long sp = regs->u_regs[UREG_FP];
- 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 inline void
-setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
-{
- struct signal_sframe __user *sframep;
- struct sigcontext __user *sc;
- int window = 0, err;
- unsigned long pc = regs->pc;
- unsigned long npc = regs->npc;
- struct thread_info *tp = current_thread_info();
- void __user *sig_address;
- int sig_code;
-
- synchronize_user_stack();
- sframep = (struct signal_sframe __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.
- */
- goto sigill_and_return;
- }
-
- 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);
- err |= __put_user(oldset->sig[0], &sc->sigc_mask);
- err |= __copy_to_user(sframep->extramask, &oldset->sig[1],
- (_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);
- err |= __put_user(regs->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(tp->w_saved, &sc->sigc_oswins);
- if (tp->w_saved)
- for (window = 0; window < tp->w_saved; window++) {
- put_user((char *)tp->rwbuf_stkptrs[window],
- &sc->sigc_spbuf[window]);
- err |= __copy_to_user(&sc->sigc_wbuf[window],
- &tp->reg_window[window],
- sizeof(struct reg_window));
- }
- else
- err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP],
- sizeof(struct reg_window));
-
- tp->w_saved = 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)) {
- sig_code = info->si_trapno;
- break;
- }
- default:
- sig_address = NULL;
- }
- }
- err |= __put_user((unsigned long)sig_address, &sframep->sig_address);
- err |= __put_user(sig_code, &sframep->sig_code);
- err |= __put_user(sc, &sframep->sig_scptr);
- if (err)
- goto sigsegv;
- regs->u_regs[UREG_FP] = (unsigned long) sframep;
- regs->pc = (unsigned long) sa->sa_handler;
- regs->npc = (regs->pc + 4);
- 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;
-sigill_and_return:
- do_exit(SIGILL);
-sigsegv:
- force_sigsegv(signr, current);
+ return (void __user *)(sp - framesize);
}
-
static inline int
save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
{
return err;
}
-static inline void
-new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
- int signo, sigset_t *oldset)
+static void setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
+ int signo, sigset_t *oldset)
{
- struct new_signal_frame __user *sf;
+ struct signal_frame __user *sf;
int sigframe_size, err;
/* 1. Make sure everything is clean */
synchronize_user_stack();
- sigframe_size = NF_ALIGNEDSZ;
+ sigframe_size = SF_ALIGNEDSZ;
if (!used_math())
sigframe_size -= sizeof(__siginfo_fpu_t);
- sf = (struct new_signal_frame __user *)
+ sf = (struct signal_frame __user *)
get_sigframe(&ka->sa, regs, sigframe_size);
if (invalid_frame_pointer(sf, sigframe_size))
force_sigsegv(signo, current);
}
-static inline void
-new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
- int signo, sigset_t *oldset, siginfo_t *info)
+static void setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
+ int signo, sigset_t *oldset, siginfo_t *info)
{
struct rt_signal_frame __user *sf;
int sigframe_size;
siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
{
if (ka->sa.sa_flags & SA_SIGINFO)
- new_setup_rt_frame(ka, regs, signr, oldset, info);
- else if (current->thread.new_signal)
- new_setup_frame(ka, regs, signr, oldset);
+ setup_rt_frame(ka, regs, signr, oldset, info);
else
- setup_frame(&ka->sa, regs, signr, oldset, info);
+ setup_frame(ka, regs, signr, oldset);
spin_lock_irq(¤t->sighand->siglock);
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*/
-asmlinkage void do_signal(struct pt_regs * regs, unsigned long orig_i0, int restart_syscall)
+static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
{
- siginfo_t info;
- struct sparc_deliver_cookie cookie;
struct k_sigaction ka;
- int signr;
+ int restart_syscall;
sigset_t *oldset;
+ siginfo_t info;
+ int signr;
- cookie.restart_syscall = restart_syscall;
- cookie.orig_i0 = orig_i0;
+ if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C))
+ restart_syscall = 1;
+ else
+ restart_syscall = 0;
if (test_thread_flag(TIF_RESTORE_SIGMASK))
oldset = ¤t->saved_sigmask;
else
oldset = ¤t->blocked;
- 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 software "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_restart(cookie.orig_i0, regs, &ka.sa);
+ if (restart_syscall)
+ syscall_restart(orig_i0, regs, &ka.sa);
handle_signal(signr, &ka, &info, oldset, regs);
/* a signal was successfully delivered; the saved
clear_thread_flag(TIF_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->pc -= 4;
regs->npc -= 4;
}
- if (cookie.restart_syscall &&
+ if (restart_syscall &&
regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
regs->u_regs[UREG_G1] = __NR_restart_syscall;
regs->pc -= 4;
}
}
+void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0,
+ unsigned long thread_info_flags)
+{
+ if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+ do_signal(regs, orig_i0);
+ if (thread_info_flags & _TIF_NOTIFY_RESUME) {
+ clear_thread_flag(TIF_NOTIFY_RESUME);
+ tracehook_notify_resume(regs);
+ }
+}
+
asmlinkage int
do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
unsigned long sp)
out:
return ret;
}
-
-void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
-{
- struct sparc_deliver_cookie *cp = cookie;
-
- if (cp->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] = cp->orig_i0;
- regs->pc -= 4;
- regs->npc -= 4;
- cp->restart_syscall = 0;
- }
-
- if (cp->restart_syscall &&
- regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
- regs->u_regs[UREG_G1] = __NR_restart_syscall;
- regs->pc -= 4;
- regs->npc -= 4;
- cp->restart_syscall = 0;
- }
-}
git.openpandora.org / pandora-kernel.git / blobdiff