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![Christoph Hellwig](/assets/img/avatar_default.png)
Also reindent the switch statement to use the normal kernel style while at it. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lkml.kernel.org/r/20190812065524.19959-2-hch@lst.de Signed-off-by: Tony Luck <tony.luck@intel.com>
412 lines
13 KiB
C
412 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Architecture-specific signal handling support.
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*
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* Copyright (C) 1999-2004 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*
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* Derived from i386 and Alpha versions.
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/ptrace.h>
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#include <linux/tracehook.h>
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/smp.h>
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#include <linux/stddef.h>
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#include <linux/tty.h>
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#include <linux/binfmts.h>
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#include <linux/unistd.h>
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#include <linux/wait.h>
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#include <asm/intrinsics.h>
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#include <linux/uaccess.h>
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#include <asm/rse.h>
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#include <asm/sigcontext.h>
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#include "sigframe.h"
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#define DEBUG_SIG 0
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#define STACK_ALIGN 16 /* minimal alignment for stack pointer */
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#if _NSIG_WORDS > 1
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# define PUT_SIGSET(k,u) __copy_to_user((u)->sig, (k)->sig, sizeof(sigset_t))
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# define GET_SIGSET(k,u) __copy_from_user((k)->sig, (u)->sig, sizeof(sigset_t))
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#else
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# define PUT_SIGSET(k,u) __put_user((k)->sig[0], &(u)->sig[0])
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# define GET_SIGSET(k,u) __get_user((k)->sig[0], &(u)->sig[0])
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#endif
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static long
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restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
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{
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unsigned long ip, flags, nat, um, cfm, rsc;
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long err;
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/* Always make any pending restarted system calls return -EINTR */
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current->restart_block.fn = do_no_restart_syscall;
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/* restore scratch that always needs gets updated during signal delivery: */
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err = __get_user(flags, &sc->sc_flags);
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err |= __get_user(nat, &sc->sc_nat);
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err |= __get_user(ip, &sc->sc_ip); /* instruction pointer */
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err |= __get_user(cfm, &sc->sc_cfm);
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err |= __get_user(um, &sc->sc_um); /* user mask */
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err |= __get_user(rsc, &sc->sc_ar_rsc);
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err |= __get_user(scr->pt.ar_unat, &sc->sc_ar_unat);
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err |= __get_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);
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err |= __get_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
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err |= __get_user(scr->pt.pr, &sc->sc_pr); /* predicates */
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err |= __get_user(scr->pt.b0, &sc->sc_br[0]); /* b0 (rp) */
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err |= __get_user(scr->pt.b6, &sc->sc_br[6]); /* b6 */
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err |= __copy_from_user(&scr->pt.r1, &sc->sc_gr[1], 8); /* r1 */
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err |= __copy_from_user(&scr->pt.r8, &sc->sc_gr[8], 4*8); /* r8-r11 */
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err |= __copy_from_user(&scr->pt.r12, &sc->sc_gr[12], 2*8); /* r12-r13 */
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err |= __copy_from_user(&scr->pt.r15, &sc->sc_gr[15], 8); /* r15 */
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scr->pt.cr_ifs = cfm | (1UL << 63);
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scr->pt.ar_rsc = rsc | (3 << 2); /* force PL3 */
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/* establish new instruction pointer: */
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scr->pt.cr_iip = ip & ~0x3UL;
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ia64_psr(&scr->pt)->ri = ip & 0x3;
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scr->pt.cr_ipsr = (scr->pt.cr_ipsr & ~IA64_PSR_UM) | (um & IA64_PSR_UM);
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scr->scratch_unat = ia64_put_scratch_nat_bits(&scr->pt, nat);
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if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
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/* Restore most scratch-state only when not in syscall. */
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err |= __get_user(scr->pt.ar_ccv, &sc->sc_ar_ccv); /* ar.ccv */
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err |= __get_user(scr->pt.b7, &sc->sc_br[7]); /* b7 */
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err |= __get_user(scr->pt.r14, &sc->sc_gr[14]); /* r14 */
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err |= __copy_from_user(&scr->pt.ar_csd, &sc->sc_ar25, 2*8); /* ar.csd & ar.ssd */
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err |= __copy_from_user(&scr->pt.r2, &sc->sc_gr[2], 2*8); /* r2-r3 */
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err |= __copy_from_user(&scr->pt.r16, &sc->sc_gr[16], 16*8); /* r16-r31 */
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}
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if ((flags & IA64_SC_FLAG_FPH_VALID) != 0) {
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struct ia64_psr *psr = ia64_psr(&scr->pt);
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err |= __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
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psr->mfh = 0; /* drop signal handler's fph contents... */
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preempt_disable();
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if (psr->dfh)
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ia64_drop_fpu(current);
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else {
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/* We already own the local fph, otherwise psr->dfh wouldn't be 0. */
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__ia64_load_fpu(current->thread.fph);
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ia64_set_local_fpu_owner(current);
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}
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preempt_enable();
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}
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return err;
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}
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long
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ia64_rt_sigreturn (struct sigscratch *scr)
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{
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extern char ia64_strace_leave_kernel, ia64_leave_kernel;
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struct sigcontext __user *sc;
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sigset_t set;
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long retval;
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sc = &((struct sigframe __user *) (scr->pt.r12 + 16))->sc;
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/*
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* When we return to the previously executing context, r8 and r10 have already
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* been setup the way we want them. Indeed, if the signal wasn't delivered while
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* in a system call, we must not touch r8 or r10 as otherwise user-level state
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* could be corrupted.
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*/
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retval = (long) &ia64_leave_kernel;
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if (test_thread_flag(TIF_SYSCALL_TRACE)
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|| test_thread_flag(TIF_SYSCALL_AUDIT))
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/*
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* strace expects to be notified after sigreturn returns even though the
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* context to which we return may not be in the middle of a syscall.
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* Thus, the return-value that strace displays for sigreturn is
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* meaningless.
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*/
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retval = (long) &ia64_strace_leave_kernel;
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if (!access_ok(sc, sizeof(*sc)))
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goto give_sigsegv;
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if (GET_SIGSET(&set, &sc->sc_mask))
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goto give_sigsegv;
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set_current_blocked(&set);
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if (restore_sigcontext(sc, scr))
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goto give_sigsegv;
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#if DEBUG_SIG
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printk("SIG return (%s:%d): sp=%lx ip=%lx\n",
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current->comm, current->pid, scr->pt.r12, scr->pt.cr_iip);
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#endif
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if (restore_altstack(&sc->sc_stack))
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goto give_sigsegv;
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return retval;
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give_sigsegv:
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force_sig(SIGSEGV);
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return retval;
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}
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/*
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* This does just the minimum required setup of sigcontext.
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* Specifically, it only installs data that is either not knowable at
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* the user-level or that gets modified before execution in the
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* trampoline starts. Everything else is done at the user-level.
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*/
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static long
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setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratch *scr)
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{
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unsigned long flags = 0, ifs, cfm, nat;
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long err = 0;
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ifs = scr->pt.cr_ifs;
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if (on_sig_stack((unsigned long) sc))
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flags |= IA64_SC_FLAG_ONSTACK;
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if ((ifs & (1UL << 63)) == 0)
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/* if cr_ifs doesn't have the valid bit set, we got here through a syscall */
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flags |= IA64_SC_FLAG_IN_SYSCALL;
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cfm = ifs & ((1UL << 38) - 1);
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ia64_flush_fph(current);
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if ((current->thread.flags & IA64_THREAD_FPH_VALID)) {
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flags |= IA64_SC_FLAG_FPH_VALID;
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err = __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16);
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}
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nat = ia64_get_scratch_nat_bits(&scr->pt, scr->scratch_unat);
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err |= __put_user(flags, &sc->sc_flags);
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err |= __put_user(nat, &sc->sc_nat);
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err |= PUT_SIGSET(mask, &sc->sc_mask);
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err |= __put_user(cfm, &sc->sc_cfm);
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err |= __put_user(scr->pt.cr_ipsr & IA64_PSR_UM, &sc->sc_um);
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err |= __put_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
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err |= __put_user(scr->pt.ar_unat, &sc->sc_ar_unat); /* ar.unat */
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err |= __put_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr); /* ar.fpsr */
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err |= __put_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
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err |= __put_user(scr->pt.pr, &sc->sc_pr); /* predicates */
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err |= __put_user(scr->pt.b0, &sc->sc_br[0]); /* b0 (rp) */
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err |= __put_user(scr->pt.b6, &sc->sc_br[6]); /* b6 */
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err |= __copy_to_user(&sc->sc_gr[1], &scr->pt.r1, 8); /* r1 */
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err |= __copy_to_user(&sc->sc_gr[8], &scr->pt.r8, 4*8); /* r8-r11 */
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err |= __copy_to_user(&sc->sc_gr[12], &scr->pt.r12, 2*8); /* r12-r13 */
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err |= __copy_to_user(&sc->sc_gr[15], &scr->pt.r15, 8); /* r15 */
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err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip);
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if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
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/* Copy scratch regs to sigcontext if the signal didn't interrupt a syscall. */
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err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv); /* ar.ccv */
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err |= __put_user(scr->pt.b7, &sc->sc_br[7]); /* b7 */
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err |= __put_user(scr->pt.r14, &sc->sc_gr[14]); /* r14 */
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err |= __copy_to_user(&sc->sc_ar25, &scr->pt.ar_csd, 2*8); /* ar.csd & ar.ssd */
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err |= __copy_to_user(&sc->sc_gr[2], &scr->pt.r2, 2*8); /* r2-r3 */
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err |= __copy_to_user(&sc->sc_gr[16], &scr->pt.r16, 16*8); /* r16-r31 */
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}
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return err;
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}
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/*
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* Check whether the register-backing store is already on the signal stack.
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*/
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static inline int
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rbs_on_sig_stack (unsigned long bsp)
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{
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return (bsp - current->sas_ss_sp < current->sas_ss_size);
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}
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static long
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setup_frame(struct ksignal *ksig, sigset_t *set, struct sigscratch *scr)
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{
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extern char __kernel_sigtramp[];
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unsigned long tramp_addr, new_rbs = 0, new_sp;
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struct sigframe __user *frame;
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long err;
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new_sp = scr->pt.r12;
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tramp_addr = (unsigned long) __kernel_sigtramp;
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if (ksig->ka.sa.sa_flags & SA_ONSTACK) {
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int onstack = sas_ss_flags(new_sp);
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if (onstack == 0) {
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new_sp = current->sas_ss_sp + current->sas_ss_size;
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/*
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* We need to check for the register stack being on the
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* signal stack separately, because it's switched
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* separately (memory stack is switched in the kernel,
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* register stack is switched in the signal trampoline).
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*/
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if (!rbs_on_sig_stack(scr->pt.ar_bspstore))
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new_rbs = ALIGN(current->sas_ss_sp,
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sizeof(long));
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} else if (onstack == SS_ONSTACK) {
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unsigned long check_sp;
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/*
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* If we are on the alternate signal stack and would
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* overflow it, don't. Return an always-bogus address
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* instead so we will die with SIGSEGV.
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*/
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check_sp = (new_sp - sizeof(*frame)) & -STACK_ALIGN;
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if (!likely(on_sig_stack(check_sp))) {
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force_sigsegv(ksig->sig);
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return 1;
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}
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}
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}
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frame = (void __user *) ((new_sp - sizeof(*frame)) & -STACK_ALIGN);
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if (!access_ok(frame, sizeof(*frame))) {
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force_sigsegv(ksig->sig);
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return 1;
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}
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err = __put_user(ksig->sig, &frame->arg0);
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err |= __put_user(&frame->info, &frame->arg1);
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err |= __put_user(&frame->sc, &frame->arg2);
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err |= __put_user(new_rbs, &frame->sc.sc_rbs_base);
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err |= __put_user(0, &frame->sc.sc_loadrs); /* initialize to zero */
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err |= __put_user(ksig->ka.sa.sa_handler, &frame->handler);
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err |= copy_siginfo_to_user(&frame->info, &ksig->info);
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err |= __save_altstack(&frame->sc.sc_stack, scr->pt.r12);
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err |= setup_sigcontext(&frame->sc, set, scr);
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if (unlikely(err)) {
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force_sigsegv(ksig->sig);
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return 1;
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}
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scr->pt.r12 = (unsigned long) frame - 16; /* new stack pointer */
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scr->pt.ar_fpsr = FPSR_DEFAULT; /* reset fpsr for signal handler */
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scr->pt.cr_iip = tramp_addr;
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ia64_psr(&scr->pt)->ri = 0; /* start executing in first slot */
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ia64_psr(&scr->pt)->be = 0; /* force little-endian byte-order */
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/*
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* Force the interruption function mask to zero. This has no effect when a
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* system-call got interrupted by a signal (since, in that case, scr->pt_cr_ifs is
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* ignored), but it has the desirable effect of making it possible to deliver a
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* signal with an incomplete register frame (which happens when a mandatory RSE
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* load faults). Furthermore, it has no negative effect on the getting the user's
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* dirty partition preserved, because that's governed by scr->pt.loadrs.
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*/
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scr->pt.cr_ifs = (1UL << 63);
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/*
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* Note: this affects only the NaT bits of the scratch regs (the ones saved in
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* pt_regs), which is exactly what we want.
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*/
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scr->scratch_unat = 0; /* ensure NaT bits of r12 is clear */
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#if DEBUG_SIG
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printk("SIG deliver (%s:%d): sig=%d sp=%lx ip=%lx handler=%p\n",
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current->comm, current->pid, ksig->sig, scr->pt.r12, frame->sc.sc_ip, frame->handler);
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#endif
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return 0;
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}
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static long
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handle_signal (struct ksignal *ksig, struct sigscratch *scr)
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{
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int ret = setup_frame(ksig, sigmask_to_save(), scr);
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if (!ret)
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signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
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return ret;
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}
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/*
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* Note that `init' is a special process: it doesn't get signals it doesn't want to
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* handle. Thus you cannot kill init even with a SIGKILL even by mistake.
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*/
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void
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ia64_do_signal (struct sigscratch *scr, long in_syscall)
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{
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long restart = in_syscall;
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long errno = scr->pt.r8;
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struct ksignal ksig;
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/*
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* This only loops in the rare cases of handle_signal() failing, in which case we
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* need to push through a forced SIGSEGV.
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*/
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while (1) {
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get_signal(&ksig);
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/*
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* get_signal() may have run a debugger (via notify_parent())
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* and the debugger may have modified the state (e.g., to arrange for an
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* inferior call), thus it's important to check for restarting _after_
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* get_signal().
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*/
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if ((long) scr->pt.r10 != -1)
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/*
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* A system calls has to be restarted only if one of the error codes
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* ERESTARTNOHAND, ERESTARTSYS, or ERESTARTNOINTR is returned. If r10
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* isn't -1 then r8 doesn't hold an error code and we don't need to
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* restart the syscall, so we can clear the "restart" flag here.
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*/
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restart = 0;
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if (ksig.sig <= 0)
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break;
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if (unlikely(restart)) {
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switch (errno) {
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case ERESTART_RESTARTBLOCK:
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case ERESTARTNOHAND:
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scr->pt.r8 = EINTR;
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/* note: scr->pt.r10 is already -1 */
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break;
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case ERESTARTSYS:
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if ((ksig.ka.sa.sa_flags & SA_RESTART) == 0) {
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scr->pt.r8 = EINTR;
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/* note: scr->pt.r10 is already -1 */
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break;
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}
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/*FALLTHRU*/
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case ERESTARTNOINTR:
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ia64_decrement_ip(&scr->pt);
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restart = 0; /* don't restart twice if handle_signal() fails... */
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}
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}
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/*
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* Whee! Actually deliver the signal. If the delivery failed, we need to
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* continue to iterate in this loop so we can deliver the SIGSEGV...
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*/
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if (handle_signal(&ksig, scr))
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return;
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}
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/* Did we come from a system call? */
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if (restart) {
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/* Restart the system call - no handlers present */
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if (errno == ERESTARTNOHAND || errno == ERESTARTSYS || errno == ERESTARTNOINTR
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|| errno == ERESTART_RESTARTBLOCK)
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{
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/*
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* Note: the syscall number is in r15 which is saved in
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* pt_regs so all we need to do here is adjust ip so that
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* the "break" instruction gets re-executed.
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*/
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ia64_decrement_ip(&scr->pt);
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if (errno == ERESTART_RESTARTBLOCK)
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scr->pt.r15 = __NR_restart_syscall;
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}
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}
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/* if there's no signal to deliver, we just put the saved sigmask
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* back */
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restore_saved_sigmask();
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}
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