X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=arch%2Fia64%2Fkernel%2Fsignal.c;h=309da3567bc851966e8a7ad27e01eccac2e26ff2;hb=feeedc6c820e1026453ad865076cee435f24d30a;hp=cdb64cc4d9c85d93ad21b26756047d358387700a;hpb=f768f9d3757be475a20cb5f9d63bda45934150b1;p=linux-2.6-omap-h63xx.git diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c index cdb64cc4d9c..e12500a9c44 100644 --- a/arch/ia64/kernel/signal.c +++ b/arch/ia64/kernel/signal.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -98,7 +99,7 @@ restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr) if ((flags & IA64_SC_FLAG_FPH_VALID) != 0) { struct ia64_psr *psr = ia64_psr(&scr->pt); - __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16); + err |= __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16); psr->mfh = 0; /* drop signal handler's fph contents... */ preempt_disable(); if (psr->dfh) @@ -244,7 +245,7 @@ static long setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratch *scr) { unsigned long flags = 0, ifs, cfm, nat; - long err; + long err = 0; ifs = scr->pt.cr_ifs; @@ -257,12 +258,12 @@ setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratc ia64_flush_fph(current); if ((current->thread.flags & IA64_THREAD_FPH_VALID)) { flags |= IA64_SC_FLAG_FPH_VALID; - __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16); + err = __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16); } nat = ia64_get_scratch_nat_bits(&scr->pt, scr->scratch_unat); - err = __put_user(flags, &sc->sc_flags); + err |= __put_user(flags, &sc->sc_flags); err |= __put_user(nat, &sc->sc_nat); err |= PUT_SIGSET(mask, &sc->sc_mask); err |= __put_user(cfm, &sc->sc_cfm); @@ -280,15 +281,7 @@ setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratc err |= __copy_to_user(&sc->sc_gr[15], &scr->pt.r15, 8); /* r15 */ err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip); - if (flags & IA64_SC_FLAG_IN_SYSCALL) { - /* Clear scratch registers if the signal interrupted a system call. */ - err |= __put_user(0, &sc->sc_ar_ccv); /* ar.ccv */ - err |= __put_user(0, &sc->sc_br[7]); /* b7 */ - err |= __put_user(0, &sc->sc_gr[14]); /* r14 */ - err |= __clear_user(&sc->sc_ar25, 2*8); /* ar.csd & ar.ssd */ - err |= __clear_user(&sc->sc_gr[2], 2*8); /* r2-r3 */ - err |= __clear_user(&sc->sc_gr[16], 16*8); /* r16-r31 */ - } else { + if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) { /* Copy scratch regs to sigcontext if the signal didn't interrupt a syscall. */ err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv); /* ar.ccv */ err |= __put_user(scr->pt.b7, &sc->sc_br[7]); /* b7 */ @@ -350,15 +343,33 @@ setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set, new_sp = scr->pt.r12; tramp_addr = (unsigned long) __kernel_sigtramp; - if ((ka->sa.sa_flags & SA_ONSTACK) && sas_ss_flags(new_sp) == 0) { - new_sp = current->sas_ss_sp + current->sas_ss_size; - /* - * We need to check for the register stack being on the signal stack - * separately, because it's switched separately (memory stack is switched - * in the kernel, register stack is switched in the signal trampoline). - */ - if (!rbs_on_sig_stack(scr->pt.ar_bspstore)) - new_rbs = (current->sas_ss_sp + sizeof(long) - 1) & ~(sizeof(long) - 1); + if (ka->sa.sa_flags & SA_ONSTACK) { + int onstack = sas_ss_flags(new_sp); + + if (onstack == 0) { + new_sp = current->sas_ss_sp + current->sas_ss_size; + /* + * We need to check for the register stack being on the + * signal stack separately, because it's switched + * separately (memory stack is switched in the kernel, + * register stack is switched in the signal trampoline). + */ + if (!rbs_on_sig_stack(scr->pt.ar_bspstore)) + new_rbs = ALIGN(current->sas_ss_sp, + sizeof(long)); + } else if (onstack == SS_ONSTACK) { + unsigned long check_sp; + + /* + * 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. + */ + check_sp = (new_sp - sizeof(*frame)) & -STACK_ALIGN; + if (!likely(on_sig_stack(check_sp))) + return force_sigsegv_info(sig, (void __user *) + check_sp); + } } frame = (void __user *) ((new_sp - sizeof(*frame)) & -STACK_ALIGN); @@ -429,6 +440,13 @@ handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigse sigaddset(¤t->blocked, sig); recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); + + /* + * Let tracing know that we've done the handler setup. + */ + tracehook_signal_handler(sig, info, ka, &scr->pt, + test_thread_flag(TIF_SINGLESTEP)); + return 1; } @@ -454,7 +472,7 @@ ia64_do_signal (struct sigscratch *scr, long in_syscall) if (!user_mode(&scr->pt)) return; - if (test_thread_flag(TIF_RESTORE_SIGMASK)) + if (current_thread_info()->status & TS_RESTORE_SIGMASK) oldset = ¤t->saved_sigmask; else oldset = ¤t->blocked; @@ -520,12 +538,13 @@ ia64_do_signal (struct sigscratch *scr, long in_syscall) * continue to iterate in this loop so we can deliver the SIGSEGV... */ if (handle_signal(signr, &ka, &info, oldset, scr)) { - /* 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 */ - if (test_thread_flag(TIF_RESTORE_SIGMASK)) - clear_thread_flag(TIF_RESTORE_SIGMASK); + * clear the TS_RESTORE_SIGMASK flag. + */ + current_thread_info()->status &= ~TS_RESTORE_SIGMASK; return; } } @@ -556,8 +575,8 @@ ia64_do_signal (struct sigscratch *scr, long in_syscall) /* 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); } }