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xianfeng |
/*
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* Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
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*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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* Copyright (C) 2001 IBM
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
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*
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* Derived from "arch/i386/kernel/signal.c"
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* Copyright (C) 1991, 1992 Linus Torvalds
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* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.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/elf.h>
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#ifdef CONFIG_PPC64
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#include <linux/syscalls.h>
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#include <linux/compat.h>
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#include <linux/ptrace.h>
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#else
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/unistd.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/freezer.h>
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#endif
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#include <asm/uaccess.h>
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#include <asm/cacheflush.h>
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#include <asm/syscalls.h>
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#include <asm/sigcontext.h>
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#include <asm/vdso.h>
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#ifdef CONFIG_PPC64
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#include "ppc32.h"
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#include <asm/unistd.h>
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#else
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#include <asm/ucontext.h>
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#include <asm/pgtable.h>
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#endif
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#include "signal.h"
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#undef DEBUG_SIG
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#ifdef CONFIG_PPC64
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#define sys_sigsuspend compat_sys_sigsuspend
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#define sys_rt_sigsuspend compat_sys_rt_sigsuspend
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#define sys_rt_sigreturn compat_sys_rt_sigreturn
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#define sys_sigaction compat_sys_sigaction
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#define sys_swapcontext compat_sys_swapcontext
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#define sys_sigreturn compat_sys_sigreturn
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#define old_sigaction old_sigaction32
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#define sigcontext sigcontext32
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#define mcontext mcontext32
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#define ucontext ucontext32
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/*
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* Returning 0 means we return to userspace via
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* ret_from_except and thus restore all user
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* registers from *regs. This is what we need
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* to do when a signal has been delivered.
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*/
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#define GP_REGS_SIZE min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
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#undef __SIGNAL_FRAMESIZE
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#define __SIGNAL_FRAMESIZE __SIGNAL_FRAMESIZE32
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#undef ELF_NVRREG
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#define ELF_NVRREG ELF_NVRREG32
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/*
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* Functions for flipping sigsets (thanks to brain dead generic
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* implementation that makes things simple for little endian only)
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*/
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static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
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{
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compat_sigset_t cset;
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switch (_NSIG_WORDS) {
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case 4: cset.sig[5] = set->sig[3] & 0xffffffffull;
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cset.sig[7] = set->sig[3] >> 32;
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case 3: cset.sig[4] = set->sig[2] & 0xffffffffull;
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cset.sig[5] = set->sig[2] >> 32;
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case 2: cset.sig[2] = set->sig[1] & 0xffffffffull;
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cset.sig[3] = set->sig[1] >> 32;
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case 1: cset.sig[0] = set->sig[0] & 0xffffffffull;
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cset.sig[1] = set->sig[0] >> 32;
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}
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return copy_to_user(uset, &cset, sizeof(*uset));
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}
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static inline int get_sigset_t(sigset_t *set,
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const compat_sigset_t __user *uset)
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{
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compat_sigset_t s32;
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if (copy_from_user(&s32, uset, sizeof(*uset)))
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return -EFAULT;
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/*
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* Swap the 2 words of the 64-bit sigset_t (they are stored
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* in the "wrong" endian in 32-bit user storage).
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*/
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switch (_NSIG_WORDS) {
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case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
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case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
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case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
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case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
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}
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return 0;
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}
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static inline int get_old_sigaction(struct k_sigaction *new_ka,
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struct old_sigaction __user *act)
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{
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compat_old_sigset_t mask;
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compat_uptr_t handler, restorer;
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if (get_user(handler, &act->sa_handler) ||
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__get_user(restorer, &act->sa_restorer) ||
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__get_user(new_ka->sa.sa_flags, &act->sa_flags) ||
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__get_user(mask, &act->sa_mask))
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return -EFAULT;
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new_ka->sa.sa_handler = compat_ptr(handler);
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new_ka->sa.sa_restorer = compat_ptr(restorer);
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siginitset(&new_ka->sa.sa_mask, mask);
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return 0;
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}
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#define to_user_ptr(p) ptr_to_compat(p)
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#define from_user_ptr(p) compat_ptr(p)
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static inline int save_general_regs(struct pt_regs *regs,
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struct mcontext __user *frame)
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{
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elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
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int i;
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WARN_ON(!FULL_REGS(regs));
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for (i = 0; i <= PT_RESULT; i ++) {
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if (i == 14 && !FULL_REGS(regs))
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i = 32;
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if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
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return -EFAULT;
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}
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return 0;
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}
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static inline int restore_general_regs(struct pt_regs *regs,
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struct mcontext __user *sr)
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{
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elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
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int i;
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for (i = 0; i <= PT_RESULT; i++) {
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if ((i == PT_MSR) || (i == PT_SOFTE))
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continue;
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if (__get_user(gregs[i], &sr->mc_gregs[i]))
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return -EFAULT;
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}
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return 0;
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}
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#else /* CONFIG_PPC64 */
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#define GP_REGS_SIZE min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
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static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
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{
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return copy_to_user(uset, set, sizeof(*uset));
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}
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static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
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{
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return copy_from_user(set, uset, sizeof(*uset));
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}
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static inline int get_old_sigaction(struct k_sigaction *new_ka,
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struct old_sigaction __user *act)
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{
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old_sigset_t mask;
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if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
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__get_user(new_ka->sa.sa_handler, &act->sa_handler) ||
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__get_user(new_ka->sa.sa_restorer, &act->sa_restorer))
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return -EFAULT;
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__get_user(new_ka->sa.sa_flags, &act->sa_flags);
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__get_user(mask, &act->sa_mask);
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siginitset(&new_ka->sa.sa_mask, mask);
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return 0;
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}
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#define to_user_ptr(p) ((unsigned long)(p))
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#define from_user_ptr(p) ((void __user *)(p))
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static inline int save_general_regs(struct pt_regs *regs,
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struct mcontext __user *frame)
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{
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WARN_ON(!FULL_REGS(regs));
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return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
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}
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static inline int restore_general_regs(struct pt_regs *regs,
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struct mcontext __user *sr)
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{
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/* copy up to but not including MSR */
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if (__copy_from_user(regs, &sr->mc_gregs,
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PT_MSR * sizeof(elf_greg_t)))
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return -EFAULT;
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/* copy from orig_r3 (the word after the MSR) up to the end */
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if (__copy_from_user(®s->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
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GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
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return -EFAULT;
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return 0;
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}
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#endif /* CONFIG_PPC64 */
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/*
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* Atomically swap in the new signal mask, and wait for a signal.
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*/
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long sys_sigsuspend(old_sigset_t mask)
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{
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mask &= _BLOCKABLE;
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spin_lock_irq(¤t->sighand->siglock);
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current->saved_sigmask = current->blocked;
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siginitset(¤t->blocked, mask);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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set_thread_flag(TIF_RESTORE_SIGMASK);
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248 |
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return -ERESTARTNOHAND;
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}
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250 |
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251 |
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long sys_sigaction(int sig, struct old_sigaction __user *act,
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struct old_sigaction __user *oact)
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253 |
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{
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254 |
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struct k_sigaction new_ka, old_ka;
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255 |
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int ret;
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256 |
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257 |
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#ifdef CONFIG_PPC64
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258 |
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if (sig < 0)
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259 |
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sig = -sig;
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260 |
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#endif
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261 |
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262 |
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if (act) {
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263 |
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if (get_old_sigaction(&new_ka, act))
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264 |
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return -EFAULT;
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265 |
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}
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266 |
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267 |
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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268 |
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if (!ret && oact) {
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269 |
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if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
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270 |
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__put_user(to_user_ptr(old_ka.sa.sa_handler),
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271 |
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&oact->sa_handler) ||
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272 |
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__put_user(to_user_ptr(old_ka.sa.sa_restorer),
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273 |
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&oact->sa_restorer) ||
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274 |
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__put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
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275 |
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__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
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276 |
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return -EFAULT;
|
277 |
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}
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278 |
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|
279 |
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return ret;
|
280 |
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}
|
281 |
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|
282 |
|
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/*
|
283 |
|
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* When we have signals to deliver, we set up on the
|
284 |
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* user stack, going down from the original stack pointer:
|
285 |
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* an ABI gap of 56 words
|
286 |
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* an mcontext struct
|
287 |
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* a sigcontext struct
|
288 |
|
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* a gap of __SIGNAL_FRAMESIZE bytes
|
289 |
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*
|
290 |
|
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* Each of these things must be a multiple of 16 bytes in size. The following
|
291 |
|
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* structure represent all of this except the __SIGNAL_FRAMESIZE gap
|
292 |
|
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*
|
293 |
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*/
|
294 |
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struct sigframe {
|
295 |
|
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struct sigcontext sctx; /* the sigcontext */
|
296 |
|
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struct mcontext mctx; /* all the register values */
|
297 |
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/*
|
298 |
|
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* Programs using the rs6000/xcoff abi can save up to 19 gp
|
299 |
|
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* regs and 18 fp regs below sp before decrementing it.
|
300 |
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*/
|
301 |
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int abigap[56];
|
302 |
|
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};
|
303 |
|
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|
304 |
|
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/* We use the mc_pad field for the signal return trampoline. */
|
305 |
|
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#define tramp mc_pad
|
306 |
|
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|
307 |
|
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/*
|
308 |
|
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* When we have rt signals to deliver, we set up on the
|
309 |
|
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* user stack, going down from the original stack pointer:
|
310 |
|
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* one rt_sigframe struct (siginfo + ucontext + ABI gap)
|
311 |
|
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* a gap of __SIGNAL_FRAMESIZE+16 bytes
|
312 |
|
|
* (the +16 is to get the siginfo and ucontext in the same
|
313 |
|
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* positions as in older kernels).
|
314 |
|
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*
|
315 |
|
|
* Each of these things must be a multiple of 16 bytes in size.
|
316 |
|
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*
|
317 |
|
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*/
|
318 |
|
|
struct rt_sigframe {
|
319 |
|
|
#ifdef CONFIG_PPC64
|
320 |
|
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compat_siginfo_t info;
|
321 |
|
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#else
|
322 |
|
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struct siginfo info;
|
323 |
|
|
#endif
|
324 |
|
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struct ucontext uc;
|
325 |
|
|
/*
|
326 |
|
|
* Programs using the rs6000/xcoff abi can save up to 19 gp
|
327 |
|
|
* regs and 18 fp regs below sp before decrementing it.
|
328 |
|
|
*/
|
329 |
|
|
int abigap[56];
|
330 |
|
|
};
|
331 |
|
|
|
332 |
|
|
/*
|
333 |
|
|
* Save the current user registers on the user stack.
|
334 |
|
|
* We only save the altivec/spe registers if the process has used
|
335 |
|
|
* altivec/spe instructions at some point.
|
336 |
|
|
*/
|
337 |
|
|
static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
|
338 |
|
|
int sigret)
|
339 |
|
|
{
|
340 |
|
|
/* Make sure floating point registers are stored in regs */
|
341 |
|
|
flush_fp_to_thread(current);
|
342 |
|
|
|
343 |
|
|
/* save general and floating-point registers */
|
344 |
|
|
if (save_general_regs(regs, frame) ||
|
345 |
|
|
__copy_to_user(&frame->mc_fregs, current->thread.fpr,
|
346 |
|
|
ELF_NFPREG * sizeof(double)))
|
347 |
|
|
return 1;
|
348 |
|
|
|
349 |
|
|
#ifdef CONFIG_ALTIVEC
|
350 |
|
|
/* save altivec registers */
|
351 |
|
|
if (current->thread.used_vr) {
|
352 |
|
|
flush_altivec_to_thread(current);
|
353 |
|
|
if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
|
354 |
|
|
ELF_NVRREG * sizeof(vector128)))
|
355 |
|
|
return 1;
|
356 |
|
|
/* set MSR_VEC in the saved MSR value to indicate that
|
357 |
|
|
frame->mc_vregs contains valid data */
|
358 |
|
|
if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR]))
|
359 |
|
|
return 1;
|
360 |
|
|
}
|
361 |
|
|
/* else assert((regs->msr & MSR_VEC) == 0) */
|
362 |
|
|
|
363 |
|
|
/* We always copy to/from vrsave, it's 0 if we don't have or don't
|
364 |
|
|
* use altivec. Since VSCR only contains 32 bits saved in the least
|
365 |
|
|
* significant bits of a vector, we "cheat" and stuff VRSAVE in the
|
366 |
|
|
* most significant bits of that same vector. --BenH
|
367 |
|
|
*/
|
368 |
|
|
if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
|
369 |
|
|
return 1;
|
370 |
|
|
#endif /* CONFIG_ALTIVEC */
|
371 |
|
|
|
372 |
|
|
#ifdef CONFIG_SPE
|
373 |
|
|
/* save spe registers */
|
374 |
|
|
if (current->thread.used_spe) {
|
375 |
|
|
flush_spe_to_thread(current);
|
376 |
|
|
if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
|
377 |
|
|
ELF_NEVRREG * sizeof(u32)))
|
378 |
|
|
return 1;
|
379 |
|
|
/* set MSR_SPE in the saved MSR value to indicate that
|
380 |
|
|
frame->mc_vregs contains valid data */
|
381 |
|
|
if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR]))
|
382 |
|
|
return 1;
|
383 |
|
|
}
|
384 |
|
|
/* else assert((regs->msr & MSR_SPE) == 0) */
|
385 |
|
|
|
386 |
|
|
/* We always copy to/from spefscr */
|
387 |
|
|
if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
|
388 |
|
|
return 1;
|
389 |
|
|
#endif /* CONFIG_SPE */
|
390 |
|
|
|
391 |
|
|
if (sigret) {
|
392 |
|
|
/* Set up the sigreturn trampoline: li r0,sigret; sc */
|
393 |
|
|
if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
|
394 |
|
|
|| __put_user(0x44000002UL, &frame->tramp[1]))
|
395 |
|
|
return 1;
|
396 |
|
|
flush_icache_range((unsigned long) &frame->tramp[0],
|
397 |
|
|
(unsigned long) &frame->tramp[2]);
|
398 |
|
|
}
|
399 |
|
|
|
400 |
|
|
return 0;
|
401 |
|
|
}
|
402 |
|
|
|
403 |
|
|
/*
|
404 |
|
|
* Restore the current user register values from the user stack,
|
405 |
|
|
* (except for MSR).
|
406 |
|
|
*/
|
407 |
|
|
static long restore_user_regs(struct pt_regs *regs,
|
408 |
|
|
struct mcontext __user *sr, int sig)
|
409 |
|
|
{
|
410 |
|
|
long err;
|
411 |
|
|
unsigned int save_r2 = 0;
|
412 |
|
|
unsigned long msr;
|
413 |
|
|
|
414 |
|
|
/*
|
415 |
|
|
* restore general registers but not including MSR or SOFTE. Also
|
416 |
|
|
* take care of keeping r2 (TLS) intact if not a signal
|
417 |
|
|
*/
|
418 |
|
|
if (!sig)
|
419 |
|
|
save_r2 = (unsigned int)regs->gpr[2];
|
420 |
|
|
err = restore_general_regs(regs, sr);
|
421 |
|
|
err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
|
422 |
|
|
if (!sig)
|
423 |
|
|
regs->gpr[2] = (unsigned long) save_r2;
|
424 |
|
|
if (err)
|
425 |
|
|
return 1;
|
426 |
|
|
|
427 |
|
|
/* if doing signal return, restore the previous little-endian mode */
|
428 |
|
|
if (sig)
|
429 |
|
|
regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
|
430 |
|
|
|
431 |
|
|
/*
|
432 |
|
|
* Do this before updating the thread state in
|
433 |
|
|
* current->thread.fpr/vr/evr. That way, if we get preempted
|
434 |
|
|
* and another task grabs the FPU/Altivec/SPE, it won't be
|
435 |
|
|
* tempted to save the current CPU state into the thread_struct
|
436 |
|
|
* and corrupt what we are writing there.
|
437 |
|
|
*/
|
438 |
|
|
discard_lazy_cpu_state();
|
439 |
|
|
|
440 |
|
|
/* force the process to reload the FP registers from
|
441 |
|
|
current->thread when it next does FP instructions */
|
442 |
|
|
regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
|
443 |
|
|
if (__copy_from_user(current->thread.fpr, &sr->mc_fregs,
|
444 |
|
|
sizeof(sr->mc_fregs)))
|
445 |
|
|
return 1;
|
446 |
|
|
|
447 |
|
|
#ifdef CONFIG_ALTIVEC
|
448 |
|
|
/* force the process to reload the altivec registers from
|
449 |
|
|
current->thread when it next does altivec instructions */
|
450 |
|
|
regs->msr &= ~MSR_VEC;
|
451 |
|
|
if (msr & MSR_VEC) {
|
452 |
|
|
/* restore altivec registers from the stack */
|
453 |
|
|
if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
|
454 |
|
|
sizeof(sr->mc_vregs)))
|
455 |
|
|
return 1;
|
456 |
|
|
} else if (current->thread.used_vr)
|
457 |
|
|
memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));
|
458 |
|
|
|
459 |
|
|
/* Always get VRSAVE back */
|
460 |
|
|
if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
|
461 |
|
|
return 1;
|
462 |
|
|
#endif /* CONFIG_ALTIVEC */
|
463 |
|
|
|
464 |
|
|
#ifdef CONFIG_SPE
|
465 |
|
|
/* force the process to reload the spe registers from
|
466 |
|
|
current->thread when it next does spe instructions */
|
467 |
|
|
regs->msr &= ~MSR_SPE;
|
468 |
|
|
if (msr & MSR_SPE) {
|
469 |
|
|
/* restore spe registers from the stack */
|
470 |
|
|
if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
|
471 |
|
|
ELF_NEVRREG * sizeof(u32)))
|
472 |
|
|
return 1;
|
473 |
|
|
} else if (current->thread.used_spe)
|
474 |
|
|
memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));
|
475 |
|
|
|
476 |
|
|
/* Always get SPEFSCR back */
|
477 |
|
|
if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
|
478 |
|
|
return 1;
|
479 |
|
|
#endif /* CONFIG_SPE */
|
480 |
|
|
|
481 |
|
|
return 0;
|
482 |
|
|
}
|
483 |
|
|
|
484 |
|
|
#ifdef CONFIG_PPC64
|
485 |
|
|
long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act,
|
486 |
|
|
struct sigaction32 __user *oact, size_t sigsetsize)
|
487 |
|
|
{
|
488 |
|
|
struct k_sigaction new_ka, old_ka;
|
489 |
|
|
int ret;
|
490 |
|
|
|
491 |
|
|
/* XXX: Don't preclude handling different sized sigset_t's. */
|
492 |
|
|
if (sigsetsize != sizeof(compat_sigset_t))
|
493 |
|
|
return -EINVAL;
|
494 |
|
|
|
495 |
|
|
if (act) {
|
496 |
|
|
compat_uptr_t handler;
|
497 |
|
|
|
498 |
|
|
ret = get_user(handler, &act->sa_handler);
|
499 |
|
|
new_ka.sa.sa_handler = compat_ptr(handler);
|
500 |
|
|
ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
|
501 |
|
|
ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
|
502 |
|
|
if (ret)
|
503 |
|
|
return -EFAULT;
|
504 |
|
|
}
|
505 |
|
|
|
506 |
|
|
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
|
507 |
|
|
if (!ret && oact) {
|
508 |
|
|
ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler);
|
509 |
|
|
ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
|
510 |
|
|
ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
|
511 |
|
|
}
|
512 |
|
|
return ret;
|
513 |
|
|
}
|
514 |
|
|
|
515 |
|
|
/*
|
516 |
|
|
* Note: it is necessary to treat how as an unsigned int, with the
|
517 |
|
|
* corresponding cast to a signed int to insure that the proper
|
518 |
|
|
* conversion (sign extension) between the register representation
|
519 |
|
|
* of a signed int (msr in 32-bit mode) and the register representation
|
520 |
|
|
* of a signed int (msr in 64-bit mode) is performed.
|
521 |
|
|
*/
|
522 |
|
|
long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set,
|
523 |
|
|
compat_sigset_t __user *oset, size_t sigsetsize)
|
524 |
|
|
{
|
525 |
|
|
sigset_t s;
|
526 |
|
|
sigset_t __user *up;
|
527 |
|
|
int ret;
|
528 |
|
|
mm_segment_t old_fs = get_fs();
|
529 |
|
|
|
530 |
|
|
if (set) {
|
531 |
|
|
if (get_sigset_t(&s, set))
|
532 |
|
|
return -EFAULT;
|
533 |
|
|
}
|
534 |
|
|
|
535 |
|
|
set_fs(KERNEL_DS);
|
536 |
|
|
/* This is valid because of the set_fs() */
|
537 |
|
|
up = (sigset_t __user *) &s;
|
538 |
|
|
ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL,
|
539 |
|
|
sigsetsize);
|
540 |
|
|
set_fs(old_fs);
|
541 |
|
|
if (ret)
|
542 |
|
|
return ret;
|
543 |
|
|
if (oset) {
|
544 |
|
|
if (put_sigset_t(oset, &s))
|
545 |
|
|
return -EFAULT;
|
546 |
|
|
}
|
547 |
|
|
return 0;
|
548 |
|
|
}
|
549 |
|
|
|
550 |
|
|
long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
|
551 |
|
|
{
|
552 |
|
|
sigset_t s;
|
553 |
|
|
int ret;
|
554 |
|
|
mm_segment_t old_fs = get_fs();
|
555 |
|
|
|
556 |
|
|
set_fs(KERNEL_DS);
|
557 |
|
|
/* The __user pointer cast is valid because of the set_fs() */
|
558 |
|
|
ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
|
559 |
|
|
set_fs(old_fs);
|
560 |
|
|
if (!ret) {
|
561 |
|
|
if (put_sigset_t(set, &s))
|
562 |
|
|
return -EFAULT;
|
563 |
|
|
}
|
564 |
|
|
return ret;
|
565 |
|
|
}
|
566 |
|
|
|
567 |
|
|
|
568 |
|
|
int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
|
569 |
|
|
{
|
570 |
|
|
int err;
|
571 |
|
|
|
572 |
|
|
if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
|
573 |
|
|
return -EFAULT;
|
574 |
|
|
|
575 |
|
|
/* If you change siginfo_t structure, please be sure
|
576 |
|
|
* this code is fixed accordingly.
|
577 |
|
|
* It should never copy any pad contained in the structure
|
578 |
|
|
* to avoid security leaks, but must copy the generic
|
579 |
|
|
* 3 ints plus the relevant union member.
|
580 |
|
|
* This routine must convert siginfo from 64bit to 32bit as well
|
581 |
|
|
* at the same time.
|
582 |
|
|
*/
|
583 |
|
|
err = __put_user(s->si_signo, &d->si_signo);
|
584 |
|
|
err |= __put_user(s->si_errno, &d->si_errno);
|
585 |
|
|
err |= __put_user((short)s->si_code, &d->si_code);
|
586 |
|
|
if (s->si_code < 0)
|
587 |
|
|
err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
|
588 |
|
|
SI_PAD_SIZE32);
|
589 |
|
|
else switch(s->si_code >> 16) {
|
590 |
|
|
case __SI_CHLD >> 16:
|
591 |
|
|
err |= __put_user(s->si_pid, &d->si_pid);
|
592 |
|
|
err |= __put_user(s->si_uid, &d->si_uid);
|
593 |
|
|
err |= __put_user(s->si_utime, &d->si_utime);
|
594 |
|
|
err |= __put_user(s->si_stime, &d->si_stime);
|
595 |
|
|
err |= __put_user(s->si_status, &d->si_status);
|
596 |
|
|
break;
|
597 |
|
|
case __SI_FAULT >> 16:
|
598 |
|
|
err |= __put_user((unsigned int)(unsigned long)s->si_addr,
|
599 |
|
|
&d->si_addr);
|
600 |
|
|
break;
|
601 |
|
|
case __SI_POLL >> 16:
|
602 |
|
|
err |= __put_user(s->si_band, &d->si_band);
|
603 |
|
|
err |= __put_user(s->si_fd, &d->si_fd);
|
604 |
|
|
break;
|
605 |
|
|
case __SI_TIMER >> 16:
|
606 |
|
|
err |= __put_user(s->si_tid, &d->si_tid);
|
607 |
|
|
err |= __put_user(s->si_overrun, &d->si_overrun);
|
608 |
|
|
err |= __put_user(s->si_int, &d->si_int);
|
609 |
|
|
break;
|
610 |
|
|
case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
|
611 |
|
|
case __SI_MESGQ >> 16:
|
612 |
|
|
err |= __put_user(s->si_int, &d->si_int);
|
613 |
|
|
/* fallthrough */
|
614 |
|
|
case __SI_KILL >> 16:
|
615 |
|
|
default:
|
616 |
|
|
err |= __put_user(s->si_pid, &d->si_pid);
|
617 |
|
|
err |= __put_user(s->si_uid, &d->si_uid);
|
618 |
|
|
break;
|
619 |
|
|
}
|
620 |
|
|
return err;
|
621 |
|
|
}
|
622 |
|
|
|
623 |
|
|
#define copy_siginfo_to_user copy_siginfo_to_user32
|
624 |
|
|
|
625 |
|
|
/*
|
626 |
|
|
* Note: it is necessary to treat pid and sig as unsigned ints, with the
|
627 |
|
|
* corresponding cast to a signed int to insure that the proper conversion
|
628 |
|
|
* (sign extension) between the register representation of a signed int
|
629 |
|
|
* (msr in 32-bit mode) and the register representation of a signed int
|
630 |
|
|
* (msr in 64-bit mode) is performed.
|
631 |
|
|
*/
|
632 |
|
|
long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo)
|
633 |
|
|
{
|
634 |
|
|
siginfo_t info;
|
635 |
|
|
int ret;
|
636 |
|
|
mm_segment_t old_fs = get_fs();
|
637 |
|
|
|
638 |
|
|
if (copy_from_user (&info, uinfo, 3*sizeof(int)) ||
|
639 |
|
|
copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32))
|
640 |
|
|
return -EFAULT;
|
641 |
|
|
set_fs (KERNEL_DS);
|
642 |
|
|
/* The __user pointer cast is valid becasuse of the set_fs() */
|
643 |
|
|
ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info);
|
644 |
|
|
set_fs (old_fs);
|
645 |
|
|
return ret;
|
646 |
|
|
}
|
647 |
|
|
/*
|
648 |
|
|
* Start Alternate signal stack support
|
649 |
|
|
*
|
650 |
|
|
* System Calls
|
651 |
|
|
* sigaltatck compat_sys_sigaltstack
|
652 |
|
|
*/
|
653 |
|
|
|
654 |
|
|
int compat_sys_sigaltstack(u32 __new, u32 __old, int r5,
|
655 |
|
|
int r6, int r7, int r8, struct pt_regs *regs)
|
656 |
|
|
{
|
657 |
|
|
stack_32_t __user * newstack = compat_ptr(__new);
|
658 |
|
|
stack_32_t __user * oldstack = compat_ptr(__old);
|
659 |
|
|
stack_t uss, uoss;
|
660 |
|
|
int ret;
|
661 |
|
|
mm_segment_t old_fs;
|
662 |
|
|
unsigned long sp;
|
663 |
|
|
compat_uptr_t ss_sp;
|
664 |
|
|
|
665 |
|
|
/*
|
666 |
|
|
* set sp to the user stack on entry to the system call
|
667 |
|
|
* the system call router sets R9 to the saved registers
|
668 |
|
|
*/
|
669 |
|
|
sp = regs->gpr[1];
|
670 |
|
|
|
671 |
|
|
/* Put new stack info in local 64 bit stack struct */
|
672 |
|
|
if (newstack) {
|
673 |
|
|
if (get_user(ss_sp, &newstack->ss_sp) ||
|
674 |
|
|
__get_user(uss.ss_flags, &newstack->ss_flags) ||
|
675 |
|
|
__get_user(uss.ss_size, &newstack->ss_size))
|
676 |
|
|
return -EFAULT;
|
677 |
|
|
uss.ss_sp = compat_ptr(ss_sp);
|
678 |
|
|
}
|
679 |
|
|
|
680 |
|
|
old_fs = get_fs();
|
681 |
|
|
set_fs(KERNEL_DS);
|
682 |
|
|
/* The __user pointer casts are valid because of the set_fs() */
|
683 |
|
|
ret = do_sigaltstack(
|
684 |
|
|
newstack ? (stack_t __user *) &uss : NULL,
|
685 |
|
|
oldstack ? (stack_t __user *) &uoss : NULL,
|
686 |
|
|
sp);
|
687 |
|
|
set_fs(old_fs);
|
688 |
|
|
/* Copy the stack information to the user output buffer */
|
689 |
|
|
if (!ret && oldstack &&
|
690 |
|
|
(put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
|
691 |
|
|
__put_user(uoss.ss_flags, &oldstack->ss_flags) ||
|
692 |
|
|
__put_user(uoss.ss_size, &oldstack->ss_size)))
|
693 |
|
|
return -EFAULT;
|
694 |
|
|
return ret;
|
695 |
|
|
}
|
696 |
|
|
#endif /* CONFIG_PPC64 */
|
697 |
|
|
|
698 |
|
|
/*
|
699 |
|
|
* Set up a signal frame for a "real-time" signal handler
|
700 |
|
|
* (one which gets siginfo).
|
701 |
|
|
*/
|
702 |
|
|
int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
|
703 |
|
|
siginfo_t *info, sigset_t *oldset,
|
704 |
|
|
struct pt_regs *regs)
|
705 |
|
|
{
|
706 |
|
|
struct rt_sigframe __user *rt_sf;
|
707 |
|
|
struct mcontext __user *frame;
|
708 |
|
|
void __user *addr;
|
709 |
|
|
unsigned long newsp = 0;
|
710 |
|
|
|
711 |
|
|
/* Set up Signal Frame */
|
712 |
|
|
/* Put a Real Time Context onto stack */
|
713 |
|
|
rt_sf = get_sigframe(ka, regs, sizeof(*rt_sf));
|
714 |
|
|
addr = rt_sf;
|
715 |
|
|
if (unlikely(rt_sf == NULL))
|
716 |
|
|
goto badframe;
|
717 |
|
|
|
718 |
|
|
/* Put the siginfo & fill in most of the ucontext */
|
719 |
|
|
if (copy_siginfo_to_user(&rt_sf->info, info)
|
720 |
|
|
|| __put_user(0, &rt_sf->uc.uc_flags)
|
721 |
|
|
|| __put_user(0, &rt_sf->uc.uc_link)
|
722 |
|
|
|| __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
|
723 |
|
|
|| __put_user(sas_ss_flags(regs->gpr[1]),
|
724 |
|
|
&rt_sf->uc.uc_stack.ss_flags)
|
725 |
|
|
|| __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
|
726 |
|
|
|| __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
|
727 |
|
|
&rt_sf->uc.uc_regs)
|
728 |
|
|
|| put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
|
729 |
|
|
goto badframe;
|
730 |
|
|
|
731 |
|
|
/* Save user registers on the stack */
|
732 |
|
|
frame = &rt_sf->uc.uc_mcontext;
|
733 |
|
|
addr = frame;
|
734 |
|
|
if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
|
735 |
|
|
if (save_user_regs(regs, frame, 0))
|
736 |
|
|
goto badframe;
|
737 |
|
|
regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp;
|
738 |
|
|
} else {
|
739 |
|
|
if (save_user_regs(regs, frame, __NR_rt_sigreturn))
|
740 |
|
|
goto badframe;
|
741 |
|
|
regs->link = (unsigned long) frame->tramp;
|
742 |
|
|
}
|
743 |
|
|
|
744 |
|
|
current->thread.fpscr.val = 0; /* turn off all fp exceptions */
|
745 |
|
|
|
746 |
|
|
/* create a stack frame for the caller of the handler */
|
747 |
|
|
newsp = ((unsigned long)rt_sf) - (__SIGNAL_FRAMESIZE + 16);
|
748 |
|
|
addr = (void __user *)regs->gpr[1];
|
749 |
|
|
if (put_user(regs->gpr[1], (u32 __user *)newsp))
|
750 |
|
|
goto badframe;
|
751 |
|
|
|
752 |
|
|
/* Fill registers for signal handler */
|
753 |
|
|
regs->gpr[1] = newsp;
|
754 |
|
|
regs->gpr[3] = sig;
|
755 |
|
|
regs->gpr[4] = (unsigned long) &rt_sf->info;
|
756 |
|
|
regs->gpr[5] = (unsigned long) &rt_sf->uc;
|
757 |
|
|
regs->gpr[6] = (unsigned long) rt_sf;
|
758 |
|
|
regs->nip = (unsigned long) ka->sa.sa_handler;
|
759 |
|
|
/* enter the signal handler in big-endian mode */
|
760 |
|
|
regs->msr &= ~MSR_LE;
|
761 |
|
|
regs->trap = 0;
|
762 |
|
|
return 1;
|
763 |
|
|
|
764 |
|
|
badframe:
|
765 |
|
|
#ifdef DEBUG_SIG
|
766 |
|
|
printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
|
767 |
|
|
regs, frame, newsp);
|
768 |
|
|
#endif
|
769 |
|
|
if (show_unhandled_signals && printk_ratelimit())
|
770 |
|
|
printk(KERN_INFO "%s[%d]: bad frame in handle_rt_signal32: "
|
771 |
|
|
"%p nip %08lx lr %08lx\n",
|
772 |
|
|
current->comm, current->pid,
|
773 |
|
|
addr, regs->nip, regs->link);
|
774 |
|
|
|
775 |
|
|
force_sigsegv(sig, current);
|
776 |
|
|
return 0;
|
777 |
|
|
}
|
778 |
|
|
|
779 |
|
|
static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
|
780 |
|
|
{
|
781 |
|
|
sigset_t set;
|
782 |
|
|
struct mcontext __user *mcp;
|
783 |
|
|
|
784 |
|
|
if (get_sigset_t(&set, &ucp->uc_sigmask))
|
785 |
|
|
return -EFAULT;
|
786 |
|
|
#ifdef CONFIG_PPC64
|
787 |
|
|
{
|
788 |
|
|
u32 cmcp;
|
789 |
|
|
|
790 |
|
|
if (__get_user(cmcp, &ucp->uc_regs))
|
791 |
|
|
return -EFAULT;
|
792 |
|
|
mcp = (struct mcontext __user *)(u64)cmcp;
|
793 |
|
|
/* no need to check access_ok(mcp), since mcp < 4GB */
|
794 |
|
|
}
|
795 |
|
|
#else
|
796 |
|
|
if (__get_user(mcp, &ucp->uc_regs))
|
797 |
|
|
return -EFAULT;
|
798 |
|
|
if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
|
799 |
|
|
return -EFAULT;
|
800 |
|
|
#endif
|
801 |
|
|
restore_sigmask(&set);
|
802 |
|
|
if (restore_user_regs(regs, mcp, sig))
|
803 |
|
|
return -EFAULT;
|
804 |
|
|
|
805 |
|
|
return 0;
|
806 |
|
|
}
|
807 |
|
|
|
808 |
|
|
long sys_swapcontext(struct ucontext __user *old_ctx,
|
809 |
|
|
struct ucontext __user *new_ctx,
|
810 |
|
|
int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
|
811 |
|
|
{
|
812 |
|
|
unsigned char tmp;
|
813 |
|
|
|
814 |
|
|
/* Context size is for future use. Right now, we only make sure
|
815 |
|
|
* we are passed something we understand
|
816 |
|
|
*/
|
817 |
|
|
if (ctx_size < sizeof(struct ucontext))
|
818 |
|
|
return -EINVAL;
|
819 |
|
|
|
820 |
|
|
if (old_ctx != NULL) {
|
821 |
|
|
struct mcontext __user *mctx;
|
822 |
|
|
|
823 |
|
|
/*
|
824 |
|
|
* old_ctx might not be 16-byte aligned, in which
|
825 |
|
|
* case old_ctx->uc_mcontext won't be either.
|
826 |
|
|
* Because we have the old_ctx->uc_pad2 field
|
827 |
|
|
* before old_ctx->uc_mcontext, we need to round down
|
828 |
|
|
* from &old_ctx->uc_mcontext to a 16-byte boundary.
|
829 |
|
|
*/
|
830 |
|
|
mctx = (struct mcontext __user *)
|
831 |
|
|
((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
|
832 |
|
|
if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
|
833 |
|
|
|| save_user_regs(regs, mctx, 0)
|
834 |
|
|
|| put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked)
|
835 |
|
|
|| __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
|
836 |
|
|
return -EFAULT;
|
837 |
|
|
}
|
838 |
|
|
if (new_ctx == NULL)
|
839 |
|
|
return 0;
|
840 |
|
|
if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx))
|
841 |
|
|
|| __get_user(tmp, (u8 __user *) new_ctx)
|
842 |
|
|
|| __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1))
|
843 |
|
|
return -EFAULT;
|
844 |
|
|
|
845 |
|
|
/*
|
846 |
|
|
* If we get a fault copying the context into the kernel's
|
847 |
|
|
* image of the user's registers, we can't just return -EFAULT
|
848 |
|
|
* because the user's registers will be corrupted. For instance
|
849 |
|
|
* the NIP value may have been updated but not some of the
|
850 |
|
|
* other registers. Given that we have done the access_ok
|
851 |
|
|
* and successfully read the first and last bytes of the region
|
852 |
|
|
* above, this should only happen in an out-of-memory situation
|
853 |
|
|
* or if another thread unmaps the region containing the context.
|
854 |
|
|
* We kill the task with a SIGSEGV in this situation.
|
855 |
|
|
*/
|
856 |
|
|
if (do_setcontext(new_ctx, regs, 0))
|
857 |
|
|
do_exit(SIGSEGV);
|
858 |
|
|
|
859 |
|
|
set_thread_flag(TIF_RESTOREALL);
|
860 |
|
|
return 0;
|
861 |
|
|
}
|
862 |
|
|
|
863 |
|
|
long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
|
864 |
|
|
struct pt_regs *regs)
|
865 |
|
|
{
|
866 |
|
|
struct rt_sigframe __user *rt_sf;
|
867 |
|
|
|
868 |
|
|
/* Always make any pending restarted system calls return -EINTR */
|
869 |
|
|
current_thread_info()->restart_block.fn = do_no_restart_syscall;
|
870 |
|
|
|
871 |
|
|
rt_sf = (struct rt_sigframe __user *)
|
872 |
|
|
(regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
|
873 |
|
|
if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
|
874 |
|
|
goto bad;
|
875 |
|
|
if (do_setcontext(&rt_sf->uc, regs, 1))
|
876 |
|
|
goto bad;
|
877 |
|
|
|
878 |
|
|
/*
|
879 |
|
|
* It's not clear whether or why it is desirable to save the
|
880 |
|
|
* sigaltstack setting on signal delivery and restore it on
|
881 |
|
|
* signal return. But other architectures do this and we have
|
882 |
|
|
* always done it up until now so it is probably better not to
|
883 |
|
|
* change it. -- paulus
|
884 |
|
|
*/
|
885 |
|
|
#ifdef CONFIG_PPC64
|
886 |
|
|
/*
|
887 |
|
|
* We use the compat_sys_ version that does the 32/64 bits conversion
|
888 |
|
|
* and takes userland pointer directly. What about error checking ?
|
889 |
|
|
* nobody does any...
|
890 |
|
|
*/
|
891 |
|
|
compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs);
|
892 |
|
|
#else
|
893 |
|
|
do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]);
|
894 |
|
|
#endif
|
895 |
|
|
set_thread_flag(TIF_RESTOREALL);
|
896 |
|
|
return 0;
|
897 |
|
|
|
898 |
|
|
bad:
|
899 |
|
|
if (show_unhandled_signals && printk_ratelimit())
|
900 |
|
|
printk(KERN_INFO "%s[%d]: bad frame in sys_rt_sigreturn: "
|
901 |
|
|
"%p nip %08lx lr %08lx\n",
|
902 |
|
|
current->comm, current->pid,
|
903 |
|
|
rt_sf, regs->nip, regs->link);
|
904 |
|
|
|
905 |
|
|
force_sig(SIGSEGV, current);
|
906 |
|
|
return 0;
|
907 |
|
|
}
|
908 |
|
|
|
909 |
|
|
#ifdef CONFIG_PPC32
|
910 |
|
|
int sys_debug_setcontext(struct ucontext __user *ctx,
|
911 |
|
|
int ndbg, struct sig_dbg_op __user *dbg,
|
912 |
|
|
int r6, int r7, int r8,
|
913 |
|
|
struct pt_regs *regs)
|
914 |
|
|
{
|
915 |
|
|
struct sig_dbg_op op;
|
916 |
|
|
int i;
|
917 |
|
|
unsigned char tmp;
|
918 |
|
|
unsigned long new_msr = regs->msr;
|
919 |
|
|
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
|
920 |
|
|
unsigned long new_dbcr0 = current->thread.dbcr0;
|
921 |
|
|
#endif
|
922 |
|
|
|
923 |
|
|
for (i=0; i<ndbg; i++) {
|
924 |
|
|
if (copy_from_user(&op, dbg + i, sizeof(op)))
|
925 |
|
|
return -EFAULT;
|
926 |
|
|
switch (op.dbg_type) {
|
927 |
|
|
case SIG_DBG_SINGLE_STEPPING:
|
928 |
|
|
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
|
929 |
|
|
if (op.dbg_value) {
|
930 |
|
|
new_msr |= MSR_DE;
|
931 |
|
|
new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
|
932 |
|
|
} else {
|
933 |
|
|
new_msr &= ~MSR_DE;
|
934 |
|
|
new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC);
|
935 |
|
|
}
|
936 |
|
|
#else
|
937 |
|
|
if (op.dbg_value)
|
938 |
|
|
new_msr |= MSR_SE;
|
939 |
|
|
else
|
940 |
|
|
new_msr &= ~MSR_SE;
|
941 |
|
|
#endif
|
942 |
|
|
break;
|
943 |
|
|
case SIG_DBG_BRANCH_TRACING:
|
944 |
|
|
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
|
945 |
|
|
return -EINVAL;
|
946 |
|
|
#else
|
947 |
|
|
if (op.dbg_value)
|
948 |
|
|
new_msr |= MSR_BE;
|
949 |
|
|
else
|
950 |
|
|
new_msr &= ~MSR_BE;
|
951 |
|
|
#endif
|
952 |
|
|
break;
|
953 |
|
|
|
954 |
|
|
default:
|
955 |
|
|
return -EINVAL;
|
956 |
|
|
}
|
957 |
|
|
}
|
958 |
|
|
|
959 |
|
|
/* We wait until here to actually install the values in the
|
960 |
|
|
registers so if we fail in the above loop, it will not
|
961 |
|
|
affect the contents of these registers. After this point,
|
962 |
|
|
failure is a problem, anyway, and it's very unlikely unless
|
963 |
|
|
the user is really doing something wrong. */
|
964 |
|
|
regs->msr = new_msr;
|
965 |
|
|
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
|
966 |
|
|
current->thread.dbcr0 = new_dbcr0;
|
967 |
|
|
#endif
|
968 |
|
|
|
969 |
|
|
if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
|
970 |
|
|
|| __get_user(tmp, (u8 __user *) ctx)
|
971 |
|
|
|| __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
|
972 |
|
|
return -EFAULT;
|
973 |
|
|
|
974 |
|
|
/*
|
975 |
|
|
* If we get a fault copying the context into the kernel's
|
976 |
|
|
* image of the user's registers, we can't just return -EFAULT
|
977 |
|
|
* because the user's registers will be corrupted. For instance
|
978 |
|
|
* the NIP value may have been updated but not some of the
|
979 |
|
|
* other registers. Given that we have done the access_ok
|
980 |
|
|
* and successfully read the first and last bytes of the region
|
981 |
|
|
* above, this should only happen in an out-of-memory situation
|
982 |
|
|
* or if another thread unmaps the region containing the context.
|
983 |
|
|
* We kill the task with a SIGSEGV in this situation.
|
984 |
|
|
*/
|
985 |
|
|
if (do_setcontext(ctx, regs, 1)) {
|
986 |
|
|
if (show_unhandled_signals && printk_ratelimit())
|
987 |
|
|
printk(KERN_INFO "%s[%d]: bad frame in "
|
988 |
|
|
"sys_debug_setcontext: %p nip %08lx "
|
989 |
|
|
"lr %08lx\n",
|
990 |
|
|
current->comm, current->pid,
|
991 |
|
|
ctx, regs->nip, regs->link);
|
992 |
|
|
|
993 |
|
|
force_sig(SIGSEGV, current);
|
994 |
|
|
goto out;
|
995 |
|
|
}
|
996 |
|
|
|
997 |
|
|
/*
|
998 |
|
|
* It's not clear whether or why it is desirable to save the
|
999 |
|
|
* sigaltstack setting on signal delivery and restore it on
|
1000 |
|
|
* signal return. But other architectures do this and we have
|
1001 |
|
|
* always done it up until now so it is probably better not to
|
1002 |
|
|
* change it. -- paulus
|
1003 |
|
|
*/
|
1004 |
|
|
do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]);
|
1005 |
|
|
|
1006 |
|
|
set_thread_flag(TIF_RESTOREALL);
|
1007 |
|
|
out:
|
1008 |
|
|
return 0;
|
1009 |
|
|
}
|
1010 |
|
|
#endif
|
1011 |
|
|
|
1012 |
|
|
/*
|
1013 |
|
|
* OK, we're invoking a handler
|
1014 |
|
|
*/
|
1015 |
|
|
int handle_signal32(unsigned long sig, struct k_sigaction *ka,
|
1016 |
|
|
siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
|
1017 |
|
|
{
|
1018 |
|
|
struct sigcontext __user *sc;
|
1019 |
|
|
struct sigframe __user *frame;
|
1020 |
|
|
unsigned long newsp = 0;
|
1021 |
|
|
|
1022 |
|
|
/* Set up Signal Frame */
|
1023 |
|
|
frame = get_sigframe(ka, regs, sizeof(*frame));
|
1024 |
|
|
if (unlikely(frame == NULL))
|
1025 |
|
|
goto badframe;
|
1026 |
|
|
sc = (struct sigcontext __user *) &frame->sctx;
|
1027 |
|
|
|
1028 |
|
|
#if _NSIG != 64
|
1029 |
|
|
#error "Please adjust handle_signal()"
|
1030 |
|
|
#endif
|
1031 |
|
|
if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
|
1032 |
|
|
|| __put_user(oldset->sig[0], &sc->oldmask)
|
1033 |
|
|
#ifdef CONFIG_PPC64
|
1034 |
|
|
|| __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
|
1035 |
|
|
#else
|
1036 |
|
|
|| __put_user(oldset->sig[1], &sc->_unused[3])
|
1037 |
|
|
#endif
|
1038 |
|
|
|| __put_user(to_user_ptr(&frame->mctx), &sc->regs)
|
1039 |
|
|
|| __put_user(sig, &sc->signal))
|
1040 |
|
|
goto badframe;
|
1041 |
|
|
|
1042 |
|
|
if (vdso32_sigtramp && current->mm->context.vdso_base) {
|
1043 |
|
|
if (save_user_regs(regs, &frame->mctx, 0))
|
1044 |
|
|
goto badframe;
|
1045 |
|
|
regs->link = current->mm->context.vdso_base + vdso32_sigtramp;
|
1046 |
|
|
} else {
|
1047 |
|
|
if (save_user_regs(regs, &frame->mctx, __NR_sigreturn))
|
1048 |
|
|
goto badframe;
|
1049 |
|
|
regs->link = (unsigned long) frame->mctx.tramp;
|
1050 |
|
|
}
|
1051 |
|
|
|
1052 |
|
|
current->thread.fpscr.val = 0; /* turn off all fp exceptions */
|
1053 |
|
|
|
1054 |
|
|
/* create a stack frame for the caller of the handler */
|
1055 |
|
|
newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
|
1056 |
|
|
if (put_user(regs->gpr[1], (u32 __user *)newsp))
|
1057 |
|
|
goto badframe;
|
1058 |
|
|
|
1059 |
|
|
regs->gpr[1] = newsp;
|
1060 |
|
|
regs->gpr[3] = sig;
|
1061 |
|
|
regs->gpr[4] = (unsigned long) sc;
|
1062 |
|
|
regs->nip = (unsigned long) ka->sa.sa_handler;
|
1063 |
|
|
/* enter the signal handler in big-endian mode */
|
1064 |
|
|
regs->msr &= ~MSR_LE;
|
1065 |
|
|
regs->trap = 0;
|
1066 |
|
|
|
1067 |
|
|
return 1;
|
1068 |
|
|
|
1069 |
|
|
badframe:
|
1070 |
|
|
#ifdef DEBUG_SIG
|
1071 |
|
|
printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
|
1072 |
|
|
regs, frame, newsp);
|
1073 |
|
|
#endif
|
1074 |
|
|
if (show_unhandled_signals && printk_ratelimit())
|
1075 |
|
|
printk(KERN_INFO "%s[%d]: bad frame in handle_signal32: "
|
1076 |
|
|
"%p nip %08lx lr %08lx\n",
|
1077 |
|
|
current->comm, current->pid,
|
1078 |
|
|
frame, regs->nip, regs->link);
|
1079 |
|
|
|
1080 |
|
|
force_sigsegv(sig, current);
|
1081 |
|
|
return 0;
|
1082 |
|
|
}
|
1083 |
|
|
|
1084 |
|
|
/*
|
1085 |
|
|
* Do a signal return; undo the signal stack.
|
1086 |
|
|
*/
|
1087 |
|
|
long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
|
1088 |
|
|
struct pt_regs *regs)
|
1089 |
|
|
{
|
1090 |
|
|
struct sigcontext __user *sc;
|
1091 |
|
|
struct sigcontext sigctx;
|
1092 |
|
|
struct mcontext __user *sr;
|
1093 |
|
|
void __user *addr;
|
1094 |
|
|
sigset_t set;
|
1095 |
|
|
|
1096 |
|
|
/* Always make any pending restarted system calls return -EINTR */
|
1097 |
|
|
current_thread_info()->restart_block.fn = do_no_restart_syscall;
|
1098 |
|
|
|
1099 |
|
|
sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
|
1100 |
|
|
addr = sc;
|
1101 |
|
|
if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
|
1102 |
|
|
goto badframe;
|
1103 |
|
|
|
1104 |
|
|
#ifdef CONFIG_PPC64
|
1105 |
|
|
/*
|
1106 |
|
|
* Note that PPC32 puts the upper 32 bits of the sigmask in the
|
1107 |
|
|
* unused part of the signal stackframe
|
1108 |
|
|
*/
|
1109 |
|
|
set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
|
1110 |
|
|
#else
|
1111 |
|
|
set.sig[0] = sigctx.oldmask;
|
1112 |
|
|
set.sig[1] = sigctx._unused[3];
|
1113 |
|
|
#endif
|
1114 |
|
|
restore_sigmask(&set);
|
1115 |
|
|
|
1116 |
|
|
sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
|
1117 |
|
|
addr = sr;
|
1118 |
|
|
if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
|
1119 |
|
|
|| restore_user_regs(regs, sr, 1))
|
1120 |
|
|
goto badframe;
|
1121 |
|
|
|
1122 |
|
|
set_thread_flag(TIF_RESTOREALL);
|
1123 |
|
|
return 0;
|
1124 |
|
|
|
1125 |
|
|
badframe:
|
1126 |
|
|
if (show_unhandled_signals && printk_ratelimit())
|
1127 |
|
|
printk(KERN_INFO "%s[%d]: bad frame in sys_sigreturn: "
|
1128 |
|
|
"%p nip %08lx lr %08lx\n",
|
1129 |
|
|
current->comm, current->pid,
|
1130 |
|
|
addr, regs->nip, regs->link);
|
1131 |
|
|
|
1132 |
|
|
force_sig(SIGSEGV, current);
|
1133 |
|
|
return 0;
|
1134 |
|
|
}
|