590 lines
16 KiB
C
590 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PA-RISC architecture-specific signal handling support.
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*
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* Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
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* Copyright (C) 2000 Linuxcare, Inc.
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* Copyright (C) 2000-2022 Helge Deller <deller@gmx.de>
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* Copyright (C) 2022 John David Anglin <dave.anglin@bell.net>
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*
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* Based on the ia64, i386, and alpha versions.
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*/
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/resume_user_mode.h>
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/compat.h>
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#include <linux/elf.h>
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#include <asm/ucontext.h>
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#include <asm/rt_sigframe.h>
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#include <linux/uaccess.h>
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#include <asm/cacheflush.h>
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#include <asm/asm-offsets.h>
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#include <asm/vdso.h>
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#ifdef CONFIG_COMPAT
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#include "signal32.h"
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#endif
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#define DEBUG_SIG 0
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#define DEBUG_SIG_LEVEL 2
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#if DEBUG_SIG
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#define DBG(LEVEL, ...) \
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((DEBUG_SIG_LEVEL >= LEVEL) \
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? printk(__VA_ARGS__) : (void) 0)
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#else
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#define DBG(LEVEL, ...)
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#endif
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/* gcc will complain if a pointer is cast to an integer of different
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* size. If you really need to do this (and we do for an ELF32 user
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* application in an ELF64 kernel) then you have to do a cast to an
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* integer of the same size first. The A() macro accomplishes
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* this. */
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#define A(__x) ((unsigned long)(__x))
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/*
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* Do a signal return - restore sigcontext.
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*/
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static long
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restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
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{
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long err = 0;
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err |= __copy_from_user(regs->gr, sc->sc_gr, sizeof(regs->gr));
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err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr));
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err |= __copy_from_user(regs->iaoq, sc->sc_iaoq, sizeof(regs->iaoq));
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err |= __copy_from_user(regs->iasq, sc->sc_iasq, sizeof(regs->iasq));
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err |= __get_user(regs->sar, &sc->sc_sar);
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DBG(2, "%s: iaoq is %#lx / %#lx\n",
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__func__, regs->iaoq[0], regs->iaoq[1]);
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DBG(2, "%s: r28 is %ld\n", __func__, regs->gr[28]);
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return err;
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}
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void
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sys_rt_sigreturn(struct pt_regs *regs, int in_syscall)
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{
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struct rt_sigframe __user *frame;
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sigset_t set;
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unsigned long usp = (regs->gr[30] & ~(0x01UL));
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unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE;
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#ifdef CONFIG_64BIT
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struct compat_rt_sigframe __user * compat_frame;
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if (is_compat_task())
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sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
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#endif
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current->restart_block.fn = do_no_restart_syscall;
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/* Unwind the user stack to get the rt_sigframe structure. */
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frame = (struct rt_sigframe __user *)
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(usp - sigframe_size);
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DBG(2, "%s: frame is %p pid %d\n", __func__, frame, task_pid_nr(current));
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regs->orig_r28 = 1; /* no restarts for sigreturn */
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#ifdef CONFIG_64BIT
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compat_frame = (struct compat_rt_sigframe __user *)frame;
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if (is_compat_task()) {
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if (get_compat_sigset(&set, &compat_frame->uc.uc_sigmask))
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goto give_sigsegv;
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} else
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#endif
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{
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if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
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goto give_sigsegv;
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}
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set_current_blocked(&set);
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/* Good thing we saved the old gr[30], eh? */
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#ifdef CONFIG_64BIT
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if (is_compat_task()) {
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DBG(1, "%s: compat_frame->uc.uc_mcontext 0x%p\n",
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__func__, &compat_frame->uc.uc_mcontext);
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// FIXME: Load upper half from register file
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if (restore_sigcontext32(&compat_frame->uc.uc_mcontext,
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&compat_frame->regs, regs))
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goto give_sigsegv;
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DBG(1, "%s: usp %#08lx stack 0x%p\n",
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__func__, usp, &compat_frame->uc.uc_stack);
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if (compat_restore_altstack(&compat_frame->uc.uc_stack))
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goto give_sigsegv;
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} else
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#endif
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{
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DBG(1, "%s: frame->uc.uc_mcontext 0x%p\n",
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__func__, &frame->uc.uc_mcontext);
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if (restore_sigcontext(&frame->uc.uc_mcontext, regs))
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goto give_sigsegv;
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DBG(1, "%s: usp %#08lx stack 0x%p\n",
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__func__, usp, &frame->uc.uc_stack);
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if (restore_altstack(&frame->uc.uc_stack))
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goto give_sigsegv;
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}
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/* If we are on the syscall path IAOQ will not be restored, and
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* if we are on the interrupt path we must not corrupt gr31.
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*/
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if (in_syscall)
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regs->gr[31] = regs->iaoq[0];
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return;
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give_sigsegv:
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DBG(1, "%s: Sending SIGSEGV\n", __func__);
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force_sig(SIGSEGV);
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return;
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}
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/*
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* Set up a signal frame.
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*/
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static inline void __user *
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get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
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{
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/*FIXME: ELF32 vs. ELF64 has different frame_size, but since we
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don't use the parameter it doesn't matter */
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DBG(1, "%s: ka = %#lx, sp = %#lx, frame_size = %zu\n",
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__func__, (unsigned long)ka, sp, frame_size);
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/* Align alternate stack and reserve 64 bytes for the signal
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handler's frame marker. */
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if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
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sp = (current->sas_ss_sp + 0x7f) & ~0x3f; /* Stacks grow up! */
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DBG(1, "%s: Returning sp = %#lx\n", __func__, (unsigned long)sp);
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return (void __user *) sp; /* Stacks grow up. Fun. */
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}
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static long
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setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, int in_syscall)
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{
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unsigned long flags = 0;
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long err = 0;
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if (on_sig_stack((unsigned long) sc))
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flags |= PARISC_SC_FLAG_ONSTACK;
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if (in_syscall) {
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flags |= PARISC_SC_FLAG_IN_SYSCALL;
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/* regs->iaoq is undefined in the syscall return path */
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err |= __put_user(regs->gr[31], &sc->sc_iaoq[0]);
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err |= __put_user(regs->gr[31]+4, &sc->sc_iaoq[1]);
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err |= __put_user(regs->sr[3], &sc->sc_iasq[0]);
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err |= __put_user(regs->sr[3], &sc->sc_iasq[1]);
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DBG(1, "%s: iaoq %#lx / %#lx (in syscall)\n",
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__func__, regs->gr[31], regs->gr[31]+4);
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} else {
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err |= __copy_to_user(sc->sc_iaoq, regs->iaoq, sizeof(regs->iaoq));
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err |= __copy_to_user(sc->sc_iasq, regs->iasq, sizeof(regs->iasq));
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DBG(1, "%s: iaoq %#lx / %#lx (not in syscall)\n",
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__func__, regs->iaoq[0], regs->iaoq[1]);
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}
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err |= __put_user(flags, &sc->sc_flags);
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err |= __copy_to_user(sc->sc_gr, regs->gr, sizeof(regs->gr));
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err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));
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err |= __put_user(regs->sar, &sc->sc_sar);
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DBG(1, "%s: r28 is %ld\n", __func__, regs->gr[28]);
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return err;
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}
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static long
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setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs,
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int in_syscall)
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{
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struct rt_sigframe __user *frame;
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unsigned long rp, usp;
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unsigned long haddr, sigframe_size;
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unsigned long start;
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int err = 0;
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#ifdef CONFIG_64BIT
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struct compat_rt_sigframe __user * compat_frame;
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#endif
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usp = (regs->gr[30] & ~(0x01UL));
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sigframe_size = PARISC_RT_SIGFRAME_SIZE;
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#ifdef CONFIG_64BIT
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if (is_compat_task()) {
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/* The gcc alloca implementation leaves garbage in the upper 32 bits of sp */
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usp = (compat_uint_t)usp;
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sigframe_size = PARISC_RT_SIGFRAME_SIZE32;
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}
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#endif
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frame = get_sigframe(&ksig->ka, usp, sigframe_size);
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DBG(1, "%s: frame %p info %p\n", __func__, frame, &ksig->info);
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start = (unsigned long) frame;
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if (start >= TASK_SIZE_MAX - sigframe_size)
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return -EFAULT;
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#ifdef CONFIG_64BIT
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compat_frame = (struct compat_rt_sigframe __user *)frame;
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if (is_compat_task()) {
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DBG(1, "%s: frame->info = 0x%p\n", __func__, &compat_frame->info);
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err |= copy_siginfo_to_user32(&compat_frame->info, &ksig->info);
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err |= __compat_save_altstack( &compat_frame->uc.uc_stack, regs->gr[30]);
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DBG(1, "%s: frame->uc = 0x%p\n", __func__, &compat_frame->uc);
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DBG(1, "%s: frame->uc.uc_mcontext = 0x%p\n",
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__func__, &compat_frame->uc.uc_mcontext);
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err |= setup_sigcontext32(&compat_frame->uc.uc_mcontext,
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&compat_frame->regs, regs, in_syscall);
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err |= put_compat_sigset(&compat_frame->uc.uc_sigmask, set,
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sizeof(compat_sigset_t));
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} else
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#endif
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{
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DBG(1, "%s: frame->info = 0x%p\n", __func__, &frame->info);
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err |= copy_siginfo_to_user(&frame->info, &ksig->info);
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err |= __save_altstack(&frame->uc.uc_stack, regs->gr[30]);
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DBG(1, "%s: frame->uc = 0x%p\n", __func__, &frame->uc);
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DBG(1, "%s: frame->uc.uc_mcontext = 0x%p\n",
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__func__, &frame->uc.uc_mcontext);
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err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, in_syscall);
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/* FIXME: Should probably be converted as well for the compat case */
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err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
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}
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if (err)
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return -EFAULT;
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#ifdef CONFIG_64BIT
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if (!is_compat_task())
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rp = VDSO64_SYMBOL(current, sigtramp_rt);
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else
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#endif
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rp = VDSO32_SYMBOL(current, sigtramp_rt);
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if (in_syscall)
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rp += 4*4; /* skip 4 instructions and start at ldi 1,%r25 */
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haddr = A(ksig->ka.sa.sa_handler);
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/* The sa_handler may be a pointer to a function descriptor */
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#ifdef CONFIG_64BIT
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if (is_compat_task()) {
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#endif
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if (haddr & PA_PLABEL_FDESC) {
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Elf32_Fdesc fdesc;
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Elf32_Fdesc __user *ufdesc = (Elf32_Fdesc __user *)A(haddr & ~3);
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err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
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if (err)
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return -EFAULT;
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haddr = fdesc.addr;
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regs->gr[19] = fdesc.gp;
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}
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#ifdef CONFIG_64BIT
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} else {
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Elf64_Fdesc fdesc;
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Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3);
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err = __copy_from_user(&fdesc, ufdesc, sizeof(fdesc));
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if (err)
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return -EFAULT;
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haddr = fdesc.addr;
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regs->gr[19] = fdesc.gp;
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DBG(1, "%s: 64 bit signal, exe=%#lx, r19=%#lx, in_syscall=%d\n",
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__func__, haddr, regs->gr[19], in_syscall);
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}
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#endif
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/* The syscall return path will create IAOQ values from r31.
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*/
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if (in_syscall) {
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regs->gr[31] = haddr;
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#ifdef CONFIG_64BIT
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if (!test_thread_flag(TIF_32BIT))
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sigframe_size |= 1; /* XXX ???? */
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#endif
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} else {
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unsigned long psw = USER_PSW;
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#ifdef CONFIG_64BIT
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if (!test_thread_flag(TIF_32BIT))
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psw |= PSW_W;
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#endif
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/* If we are singlestepping, arrange a trap to be delivered
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when we return to userspace. Note the semantics -- we
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should trap before the first insn in the handler is
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executed. Ref:
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http://sources.redhat.com/ml/gdb/2004-11/msg00245.html
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*/
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if (pa_psw(current)->r) {
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pa_psw(current)->r = 0;
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psw |= PSW_R;
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mtctl(-1, 0);
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}
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regs->gr[0] = psw;
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regs->iaoq[0] = haddr | PRIV_USER;
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regs->iaoq[1] = regs->iaoq[0] + 4;
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}
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regs->gr[2] = rp; /* userland return pointer */
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regs->gr[26] = ksig->sig; /* signal number */
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#ifdef CONFIG_64BIT
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if (is_compat_task()) {
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regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */
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regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */
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} else
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#endif
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{
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regs->gr[25] = A(&frame->info); /* siginfo pointer */
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regs->gr[24] = A(&frame->uc); /* ucontext pointer */
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}
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DBG(1, "%s: making sigreturn frame: %#lx + %#lx = %#lx\n", __func__,
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regs->gr[30], sigframe_size,
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regs->gr[30] + sigframe_size);
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/* Raise the user stack pointer to make a proper call frame. */
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regs->gr[30] = (A(frame) + sigframe_size);
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DBG(1, "%s: sig deliver (%s,%d) frame=0x%p sp=%#lx iaoq=%#lx/%#lx rp=%#lx\n",
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__func__, current->comm, current->pid, frame, regs->gr[30],
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regs->iaoq[0], regs->iaoq[1], rp);
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return 0;
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}
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/*
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* OK, we're invoking a handler.
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*/
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static void
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handle_signal(struct ksignal *ksig, struct pt_regs *regs, int in_syscall)
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{
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int ret;
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sigset_t *oldset = sigmask_to_save();
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DBG(1, "%s: sig=%d, ka=%p, info=%p, oldset=%p, regs=%p\n",
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__func__, ksig->sig, &ksig->ka, &ksig->info, oldset, regs);
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/* Set up the stack frame */
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ret = setup_rt_frame(ksig, oldset, regs, in_syscall);
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signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP) ||
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test_thread_flag(TIF_BLOCKSTEP));
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DBG(1, "%s: Exit (success), regs->gr[28] = %ld\n",
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__func__, regs->gr[28]);
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}
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/*
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* Check how the syscall number gets loaded into %r20 within
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* the delay branch in userspace and adjust as needed.
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*/
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static void check_syscallno_in_delay_branch(struct pt_regs *regs)
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{
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u32 opcode, source_reg;
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u32 __user *uaddr;
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int err;
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/* Usually we don't have to restore %r20 (the system call number)
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* because it gets loaded in the delay slot of the branch external
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* instruction via the ldi instruction.
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* In some cases a register-to-register copy instruction might have
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* been used instead, in which case we need to copy the syscall
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* number into the source register before returning to userspace.
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*/
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/* A syscall is just a branch, so all we have to do is fiddle the
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* return pointer so that the ble instruction gets executed again.
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*/
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regs->gr[31] -= 8; /* delayed branching */
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/* Get assembler opcode of code in delay branch */
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uaddr = (unsigned int *) ((regs->gr[31] & ~3) + 4);
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err = get_user(opcode, uaddr);
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if (err)
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return;
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/* Check if delay branch uses "ldi int,%r20" */
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if ((opcode & 0xffff0000) == 0x34140000)
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return; /* everything ok, just return */
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/* Check if delay branch uses "nop" */
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if (opcode == INSN_NOP)
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return;
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/* Check if delay branch uses "copy %rX,%r20" */
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if ((opcode & 0xffe0ffff) == 0x08000254) {
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source_reg = (opcode >> 16) & 31;
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regs->gr[source_reg] = regs->gr[20];
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return;
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}
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pr_warn("syscall restart: %s (pid %d): unexpected opcode 0x%08x\n",
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current->comm, task_pid_nr(current), opcode);
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}
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static inline void
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syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
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{
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if (regs->orig_r28)
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return;
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regs->orig_r28 = 1; /* no more restarts */
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DBG(1, "%s: orig_r28 = %ld pid %d r20 %ld\n",
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__func__, regs->orig_r28, task_pid_nr(current), regs->gr[20]);
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/* Check the return code */
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switch (regs->gr[28]) {
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case -ERESTART_RESTARTBLOCK:
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case -ERESTARTNOHAND:
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DBG(1, "%s: ERESTARTNOHAND: returning -EINTR\n", __func__);
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regs->gr[28] = -EINTR;
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break;
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case -ERESTARTSYS:
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|
if (!(ka->sa.sa_flags & SA_RESTART)) {
|
|
DBG(1, "%s: ERESTARTSYS: putting -EINTR pid %d\n",
|
|
__func__, task_pid_nr(current));
|
|
regs->gr[28] = -EINTR;
|
|
break;
|
|
}
|
|
fallthrough;
|
|
case -ERESTARTNOINTR:
|
|
DBG(1, "%s: %ld\n", __func__, regs->gr[28]);
|
|
check_syscallno_in_delay_branch(regs);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
insert_restart_trampoline(struct pt_regs *regs)
|
|
{
|
|
if (regs->orig_r28)
|
|
return;
|
|
regs->orig_r28 = 1; /* no more restarts */
|
|
|
|
DBG(2, "%s: gr28 = %ld pid %d\n",
|
|
__func__, regs->gr[28], task_pid_nr(current));
|
|
|
|
switch (regs->gr[28]) {
|
|
case -ERESTART_RESTARTBLOCK: {
|
|
/* Restart the system call - no handlers present */
|
|
unsigned int *usp = (unsigned int *)regs->gr[30];
|
|
unsigned long rp;
|
|
long err = 0;
|
|
|
|
/* check that we don't exceed the stack */
|
|
if (A(&usp[0]) >= TASK_SIZE_MAX - 5 * sizeof(int))
|
|
return;
|
|
|
|
/* Call trampoline in vdso to restart the syscall
|
|
* with __NR_restart_syscall.
|
|
* Original return addresses are on stack like this:
|
|
*
|
|
* 0: <return address (orig r31)>
|
|
* 4: <2nd half for 64-bit>
|
|
*/
|
|
#ifdef CONFIG_64BIT
|
|
if (!is_compat_task()) {
|
|
err |= put_user(regs->gr[31] >> 32, &usp[0]);
|
|
err |= put_user(regs->gr[31] & 0xffffffff, &usp[1]);
|
|
rp = VDSO64_SYMBOL(current, restart_syscall);
|
|
} else
|
|
#endif
|
|
{
|
|
err |= put_user(regs->gr[31], &usp[0]);
|
|
rp = VDSO32_SYMBOL(current, restart_syscall);
|
|
}
|
|
WARN_ON(err);
|
|
|
|
regs->gr[31] = rp;
|
|
DBG(1, "%s: ERESTART_RESTARTBLOCK\n", __func__);
|
|
return;
|
|
}
|
|
case -EINTR:
|
|
/* ok, was handled before and should be returned. */
|
|
break;
|
|
case -ERESTARTNOHAND:
|
|
case -ERESTARTSYS:
|
|
case -ERESTARTNOINTR:
|
|
DBG(1, "%s: Type %ld\n", __func__, regs->gr[28]);
|
|
check_syscallno_in_delay_branch(regs);
|
|
return;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We need to be able to restore the syscall arguments (r21-r26) to
|
|
* restart syscalls. Thus, the syscall path should save them in the
|
|
* pt_regs structure (it's okay to do so since they are caller-save
|
|
* registers). As noted below, the syscall number gets restored for
|
|
* us due to the magic of delayed branching.
|
|
*/
|
|
static void do_signal(struct pt_regs *regs, long in_syscall)
|
|
{
|
|
struct ksignal ksig;
|
|
int restart_syscall;
|
|
bool has_handler;
|
|
|
|
has_handler = get_signal(&ksig);
|
|
|
|
restart_syscall = 0;
|
|
if (in_syscall)
|
|
restart_syscall = 1;
|
|
|
|
if (has_handler) {
|
|
/* Restart a system call if necessary. */
|
|
if (restart_syscall)
|
|
syscall_restart(regs, &ksig.ka);
|
|
|
|
handle_signal(&ksig, regs, in_syscall);
|
|
DBG(1, "%s: Handled signal pid %d\n",
|
|
__func__, task_pid_nr(current));
|
|
return;
|
|
}
|
|
|
|
/* Do we need to restart the system call? */
|
|
if (restart_syscall)
|
|
insert_restart_trampoline(regs);
|
|
|
|
DBG(1, "%s: Exit (not delivered), regs->gr[28] = %ld orig_r28 = %ld pid %d\n",
|
|
__func__, regs->gr[28], regs->orig_r28, task_pid_nr(current));
|
|
|
|
restore_saved_sigmask();
|
|
}
|
|
|
|
void do_notify_resume(struct pt_regs *regs, long in_syscall)
|
|
{
|
|
if (test_thread_flag(TIF_SIGPENDING) ||
|
|
test_thread_flag(TIF_NOTIFY_SIGNAL))
|
|
do_signal(regs, in_syscall);
|
|
|
|
if (test_thread_flag(TIF_NOTIFY_RESUME))
|
|
resume_user_mode_work(regs);
|
|
}
|