![Richard Weinberger](/assets/img/avatar_default.png)
As execution domain support is gone we can remove signal translation from the signal code and remove exec_domain from thread_info. Signed-off-by: Richard Weinberger <richard@nod.at>
570 lines
16 KiB
C
570 lines
16 KiB
C
/*
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* Copyright IBM Corp. 1999, 2006
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* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
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*
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* Based on Intel version
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
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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/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/personality.h>
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#include <linux/binfmts.h>
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#include <linux/tracehook.h>
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#include <linux/syscalls.h>
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#include <linux/compat.h>
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#include <asm/ucontext.h>
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#include <asm/uaccess.h>
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#include <asm/lowcore.h>
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#include <asm/switch_to.h>
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#include "entry.h"
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/*
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* Layout of an old-style signal-frame:
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* -----------------------------------------
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* | save area (_SIGNAL_FRAMESIZE) |
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* -----------------------------------------
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* | struct sigcontext |
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* | oldmask |
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* | _sigregs * |
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* -----------------------------------------
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* | _sigregs with |
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* | _s390_regs_common |
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* | _s390_fp_regs |
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* -----------------------------------------
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* | int signo |
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* -----------------------------------------
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* | _sigregs_ext with |
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* | gprs_high 64 byte (opt) |
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* | vxrs_low 128 byte (opt) |
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* | vxrs_high 256 byte (opt) |
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* | reserved 128 byte (opt) |
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* -----------------------------------------
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* | __u16 svc_insn |
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* -----------------------------------------
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* The svc_insn entry with the sigreturn system call opcode does not
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* have a fixed position and moves if gprs_high or vxrs exist.
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* Future extensions will be added to _sigregs_ext.
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*/
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struct sigframe
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{
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__u8 callee_used_stack[__SIGNAL_FRAMESIZE];
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struct sigcontext sc;
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_sigregs sregs;
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int signo;
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_sigregs_ext sregs_ext;
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__u16 svc_insn; /* Offset of svc_insn is NOT fixed! */
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};
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/*
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* Layout of an rt signal-frame:
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* -----------------------------------------
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* | save area (_SIGNAL_FRAMESIZE) |
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* -----------------------------------------
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* | svc __NR_rt_sigreturn 2 byte |
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* -----------------------------------------
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* | struct siginfo |
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* -----------------------------------------
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* | struct ucontext_extended with |
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* | unsigned long uc_flags |
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* | struct ucontext *uc_link |
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* | stack_t uc_stack |
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* | _sigregs uc_mcontext with |
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* | _s390_regs_common |
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* | _s390_fp_regs |
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* | sigset_t uc_sigmask |
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* | _sigregs_ext uc_mcontext_ext |
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* | gprs_high 64 byte (opt) |
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* | vxrs_low 128 byte (opt) |
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* | vxrs_high 256 byte (opt)|
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* | reserved 128 byte (opt) |
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* -----------------------------------------
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* Future extensions will be added to _sigregs_ext.
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*/
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struct rt_sigframe
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{
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__u8 callee_used_stack[__SIGNAL_FRAMESIZE];
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__u16 svc_insn;
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struct siginfo info;
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struct ucontext_extended uc;
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};
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/* Store registers needed to create the signal frame */
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static void store_sigregs(void)
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{
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save_access_regs(current->thread.acrs);
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save_fp_ctl(¤t->thread.fp_regs.fpc);
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#ifdef CONFIG_64BIT
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if (current->thread.vxrs) {
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int i;
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save_vx_regs(current->thread.vxrs);
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for (i = 0; i < __NUM_FPRS; i++)
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current->thread.fp_regs.fprs[i] =
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*(freg_t *)(current->thread.vxrs + i);
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} else
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#endif
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save_fp_regs(current->thread.fp_regs.fprs);
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}
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/* Load registers after signal return */
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static void load_sigregs(void)
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{
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restore_access_regs(current->thread.acrs);
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/* restore_fp_ctl is done in restore_sigregs */
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#ifdef CONFIG_64BIT
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if (current->thread.vxrs) {
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int i;
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for (i = 0; i < __NUM_FPRS; i++)
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*(freg_t *)(current->thread.vxrs + i) =
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current->thread.fp_regs.fprs[i];
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restore_vx_regs(current->thread.vxrs);
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} else
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#endif
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restore_fp_regs(current->thread.fp_regs.fprs);
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}
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/* Returns non-zero on fault. */
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static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
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{
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_sigregs user_sregs;
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/* Copy a 'clean' PSW mask to the user to avoid leaking
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information about whether PER is currently on. */
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user_sregs.regs.psw.mask = PSW_USER_BITS |
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(regs->psw.mask & (PSW_MASK_USER | PSW_MASK_RI));
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user_sregs.regs.psw.addr = regs->psw.addr;
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memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs));
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memcpy(&user_sregs.regs.acrs, current->thread.acrs,
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sizeof(user_sregs.regs.acrs));
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memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs,
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sizeof(user_sregs.fpregs));
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if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs)))
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return -EFAULT;
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return 0;
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}
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static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
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{
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_sigregs user_sregs;
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/* Alwys make any pending restarted system call return -EINTR */
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current->restart_block.fn = do_no_restart_syscall;
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if (__copy_from_user(&user_sregs, sregs, sizeof(user_sregs)))
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return -EFAULT;
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if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW_MASK_RI))
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return -EINVAL;
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/* Loading the floating-point-control word can fail. Do that first. */
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if (restore_fp_ctl(&user_sregs.fpregs.fpc))
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return -EINVAL;
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/* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */
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regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) |
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(user_sregs.regs.psw.mask & (PSW_MASK_USER | PSW_MASK_RI));
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/* Check for invalid user address space control. */
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if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME)
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regs->psw.mask = PSW_ASC_PRIMARY |
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(regs->psw.mask & ~PSW_MASK_ASC);
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/* Check for invalid amode */
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if (regs->psw.mask & PSW_MASK_EA)
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regs->psw.mask |= PSW_MASK_BA;
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regs->psw.addr = user_sregs.regs.psw.addr;
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memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs));
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memcpy(¤t->thread.acrs, &user_sregs.regs.acrs,
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sizeof(current->thread.acrs));
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memcpy(¤t->thread.fp_regs, &user_sregs.fpregs,
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sizeof(current->thread.fp_regs));
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clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
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return 0;
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}
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/* Returns non-zero on fault. */
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static int save_sigregs_ext(struct pt_regs *regs,
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_sigregs_ext __user *sregs_ext)
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{
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#ifdef CONFIG_64BIT
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__u64 vxrs[__NUM_VXRS_LOW];
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int i;
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/* Save vector registers to signal stack */
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if (current->thread.vxrs) {
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for (i = 0; i < __NUM_VXRS_LOW; i++)
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vxrs[i] = *((__u64 *)(current->thread.vxrs + i) + 1);
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if (__copy_to_user(&sregs_ext->vxrs_low, vxrs,
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sizeof(sregs_ext->vxrs_low)) ||
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__copy_to_user(&sregs_ext->vxrs_high,
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current->thread.vxrs + __NUM_VXRS_LOW,
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sizeof(sregs_ext->vxrs_high)))
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return -EFAULT;
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}
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#endif
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return 0;
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}
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static int restore_sigregs_ext(struct pt_regs *regs,
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_sigregs_ext __user *sregs_ext)
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{
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#ifdef CONFIG_64BIT
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__u64 vxrs[__NUM_VXRS_LOW];
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int i;
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/* Restore vector registers from signal stack */
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if (current->thread.vxrs) {
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if (__copy_from_user(vxrs, &sregs_ext->vxrs_low,
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sizeof(sregs_ext->vxrs_low)) ||
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__copy_from_user(current->thread.vxrs + __NUM_VXRS_LOW,
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&sregs_ext->vxrs_high,
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sizeof(sregs_ext->vxrs_high)))
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return -EFAULT;
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for (i = 0; i < __NUM_VXRS_LOW; i++)
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*((__u64 *)(current->thread.vxrs + i) + 1) = vxrs[i];
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}
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#endif
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return 0;
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}
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SYSCALL_DEFINE0(sigreturn)
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{
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struct pt_regs *regs = task_pt_regs(current);
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struct sigframe __user *frame =
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(struct sigframe __user *) regs->gprs[15];
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sigset_t set;
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if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE))
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goto badframe;
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set_current_blocked(&set);
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if (restore_sigregs(regs, &frame->sregs))
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goto badframe;
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if (restore_sigregs_ext(regs, &frame->sregs_ext))
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goto badframe;
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load_sigregs();
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return regs->gprs[2];
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badframe:
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force_sig(SIGSEGV, current);
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return 0;
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}
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SYSCALL_DEFINE0(rt_sigreturn)
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{
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struct pt_regs *regs = task_pt_regs(current);
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struct rt_sigframe __user *frame =
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(struct rt_sigframe __user *)regs->gprs[15];
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sigset_t set;
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if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set)))
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goto badframe;
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set_current_blocked(&set);
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if (restore_altstack(&frame->uc.uc_stack))
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goto badframe;
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if (restore_sigregs(regs, &frame->uc.uc_mcontext))
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goto badframe;
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if (restore_sigregs_ext(regs, &frame->uc.uc_mcontext_ext))
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goto badframe;
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load_sigregs();
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return regs->gprs[2];
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badframe:
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force_sig(SIGSEGV, current);
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return 0;
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}
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/*
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* Determine which stack to use..
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*/
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static inline void __user *
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get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
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{
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unsigned long sp;
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/* Default to using normal stack */
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sp = regs->gprs[15];
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/* Overflow on alternate signal stack gives SIGSEGV. */
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if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
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return (void __user *) -1UL;
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/* This is the X/Open sanctioned signal stack switching. */
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if (ka->sa.sa_flags & SA_ONSTACK) {
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if (! sas_ss_flags(sp))
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sp = current->sas_ss_sp + current->sas_ss_size;
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}
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return (void __user *)((sp - frame_size) & -8ul);
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}
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static int setup_frame(int sig, struct k_sigaction *ka,
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sigset_t *set, struct pt_regs * regs)
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{
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struct sigframe __user *frame;
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struct sigcontext sc;
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unsigned long restorer;
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size_t frame_size;
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/*
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* gprs_high are only present for a 31-bit task running on
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* a 64-bit kernel (see compat_signal.c) but the space for
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* gprs_high need to be allocated if vector registers are
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* included in the signal frame on a 31-bit system.
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*/
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frame_size = sizeof(*frame) - sizeof(frame->sregs_ext);
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if (MACHINE_HAS_VX)
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frame_size += sizeof(frame->sregs_ext);
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frame = get_sigframe(ka, regs, frame_size);
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if (frame == (void __user *) -1UL)
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return -EFAULT;
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/* Set up backchain. */
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if (__put_user(regs->gprs[15], (addr_t __user *) frame))
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return -EFAULT;
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/* Create struct sigcontext on the signal stack */
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memcpy(&sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE);
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sc.sregs = (_sigregs __user __force *) &frame->sregs;
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if (__copy_to_user(&frame->sc, &sc, sizeof(frame->sc)))
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return -EFAULT;
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/* Store registers needed to create the signal frame */
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store_sigregs();
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/* Create _sigregs on the signal stack */
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if (save_sigregs(regs, &frame->sregs))
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return -EFAULT;
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/* Place signal number on stack to allow backtrace from handler. */
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if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
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return -EFAULT;
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/* Create _sigregs_ext on the signal stack */
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if (save_sigregs_ext(regs, &frame->sregs_ext))
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return -EFAULT;
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/* Set up to return from userspace. If provided, use a stub
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already in userspace. */
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if (ka->sa.sa_flags & SA_RESTORER) {
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restorer = (unsigned long) ka->sa.sa_restorer | PSW_ADDR_AMODE;
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} else {
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/* Signal frame without vector registers are short ! */
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__u16 __user *svc = (void __user *) frame + frame_size - 2;
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if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, svc))
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return -EFAULT;
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restorer = (unsigned long) svc | PSW_ADDR_AMODE;
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}
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/* Set up registers for signal handler */
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regs->gprs[14] = restorer;
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regs->gprs[15] = (unsigned long) frame;
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/* Force default amode and default user address space control. */
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regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
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(PSW_USER_BITS & PSW_MASK_ASC) |
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(regs->psw.mask & ~PSW_MASK_ASC);
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regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
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regs->gprs[2] = sig;
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regs->gprs[3] = (unsigned long) &frame->sc;
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/* We forgot to include these in the sigcontext.
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To avoid breaking binary compatibility, they are passed as args. */
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if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
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sig == SIGTRAP || sig == SIGFPE) {
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/* set extra registers only for synchronous signals */
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regs->gprs[4] = regs->int_code & 127;
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regs->gprs[5] = regs->int_parm_long;
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regs->gprs[6] = task_thread_info(current)->last_break;
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}
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return 0;
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}
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static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
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struct pt_regs *regs)
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{
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struct rt_sigframe __user *frame;
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unsigned long uc_flags, restorer;
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size_t frame_size;
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frame_size = sizeof(struct rt_sigframe) - sizeof(_sigregs_ext);
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/*
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* gprs_high are only present for a 31-bit task running on
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* a 64-bit kernel (see compat_signal.c) but the space for
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* gprs_high need to be allocated if vector registers are
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* included in the signal frame on a 31-bit system.
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*/
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uc_flags = 0;
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#ifdef CONFIG_64BIT
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if (MACHINE_HAS_VX) {
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frame_size += sizeof(_sigregs_ext);
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if (current->thread.vxrs)
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uc_flags |= UC_VXRS;
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}
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#endif
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frame = get_sigframe(&ksig->ka, regs, frame_size);
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if (frame == (void __user *) -1UL)
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return -EFAULT;
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/* Set up backchain. */
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if (__put_user(regs->gprs[15], (addr_t __user *) frame))
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return -EFAULT;
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/* Set up to return from userspace. If provided, use a stub
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already in userspace. */
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if (ksig->ka.sa.sa_flags & SA_RESTORER) {
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restorer = (unsigned long)
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ksig->ka.sa.sa_restorer | PSW_ADDR_AMODE;
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} else {
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__u16 __user *svc = &frame->svc_insn;
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if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, svc))
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return -EFAULT;
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restorer = (unsigned long) svc | PSW_ADDR_AMODE;
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}
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/* Create siginfo on the signal stack */
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if (copy_siginfo_to_user(&frame->info, &ksig->info))
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return -EFAULT;
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/* Store registers needed to create the signal frame */
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store_sigregs();
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/* Create ucontext on the signal stack. */
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if (__put_user(uc_flags, &frame->uc.uc_flags) ||
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__put_user(NULL, &frame->uc.uc_link) ||
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__save_altstack(&frame->uc.uc_stack, regs->gprs[15]) ||
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save_sigregs(regs, &frame->uc.uc_mcontext) ||
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__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)) ||
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save_sigregs_ext(regs, &frame->uc.uc_mcontext_ext))
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return -EFAULT;
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/* Set up registers for signal handler */
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regs->gprs[14] = restorer;
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regs->gprs[15] = (unsigned long) frame;
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/* Force default amode and default user address space control. */
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regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
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(PSW_USER_BITS & PSW_MASK_ASC) |
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(regs->psw.mask & ~PSW_MASK_ASC);
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regs->psw.addr = (unsigned long) ksig->ka.sa.sa_handler | PSW_ADDR_AMODE;
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regs->gprs[2] = ksig->sig;
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regs->gprs[3] = (unsigned long) &frame->info;
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regs->gprs[4] = (unsigned long) &frame->uc;
|
|
regs->gprs[5] = task_thread_info(current)->last_break;
|
|
return 0;
|
|
}
|
|
|
|
static void handle_signal(struct ksignal *ksig, sigset_t *oldset,
|
|
struct pt_regs *regs)
|
|
{
|
|
int ret;
|
|
|
|
/* Set up the stack frame */
|
|
if (ksig->ka.sa.sa_flags & SA_SIGINFO)
|
|
ret = setup_rt_frame(ksig, oldset, regs);
|
|
else
|
|
ret = setup_frame(ksig->sig, &ksig->ka, oldset, regs);
|
|
|
|
signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLE_STEP));
|
|
}
|
|
|
|
/*
|
|
* Note that 'init' is a special process: it doesn't get signals it doesn't
|
|
* want to handle. Thus you cannot kill init even with a SIGKILL even by
|
|
* mistake.
|
|
*
|
|
* Note that we go through the signals twice: once to check the signals that
|
|
* the kernel can handle, and then we build all the user-level signal handling
|
|
* stack-frames in one go after that.
|
|
*/
|
|
void do_signal(struct pt_regs *regs)
|
|
{
|
|
struct ksignal ksig;
|
|
sigset_t *oldset = sigmask_to_save();
|
|
|
|
/*
|
|
* Get signal to deliver. When running under ptrace, at this point
|
|
* the debugger may change all our registers, including the system
|
|
* call information.
|
|
*/
|
|
current_thread_info()->system_call =
|
|
test_pt_regs_flag(regs, PIF_SYSCALL) ? regs->int_code : 0;
|
|
|
|
if (get_signal(&ksig)) {
|
|
/* Whee! Actually deliver the signal. */
|
|
if (current_thread_info()->system_call) {
|
|
regs->int_code = current_thread_info()->system_call;
|
|
/* Check for system call restarting. */
|
|
switch (regs->gprs[2]) {
|
|
case -ERESTART_RESTARTBLOCK:
|
|
case -ERESTARTNOHAND:
|
|
regs->gprs[2] = -EINTR;
|
|
break;
|
|
case -ERESTARTSYS:
|
|
if (!(ksig.ka.sa.sa_flags & SA_RESTART)) {
|
|
regs->gprs[2] = -EINTR;
|
|
break;
|
|
}
|
|
/* fallthrough */
|
|
case -ERESTARTNOINTR:
|
|
regs->gprs[2] = regs->orig_gpr2;
|
|
regs->psw.addr =
|
|
__rewind_psw(regs->psw,
|
|
regs->int_code >> 16);
|
|
break;
|
|
}
|
|
}
|
|
/* No longer in a system call */
|
|
clear_pt_regs_flag(regs, PIF_SYSCALL);
|
|
|
|
if (is_compat_task())
|
|
handle_signal32(&ksig, oldset, regs);
|
|
else
|
|
handle_signal(&ksig, oldset, regs);
|
|
return;
|
|
}
|
|
|
|
/* No handlers present - check for system call restart */
|
|
clear_pt_regs_flag(regs, PIF_SYSCALL);
|
|
if (current_thread_info()->system_call) {
|
|
regs->int_code = current_thread_info()->system_call;
|
|
switch (regs->gprs[2]) {
|
|
case -ERESTART_RESTARTBLOCK:
|
|
/* Restart with sys_restart_syscall */
|
|
regs->int_code = __NR_restart_syscall;
|
|
/* fallthrough */
|
|
case -ERESTARTNOHAND:
|
|
case -ERESTARTSYS:
|
|
case -ERESTARTNOINTR:
|
|
/* Restart system call with magic TIF bit. */
|
|
regs->gprs[2] = regs->orig_gpr2;
|
|
set_pt_regs_flag(regs, PIF_SYSCALL);
|
|
if (test_thread_flag(TIF_SINGLE_STEP))
|
|
clear_pt_regs_flag(regs, PIF_PER_TRAP);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If there's no signal to deliver, we just put the saved sigmask back.
|
|
*/
|
|
restore_saved_sigmask();
|
|
}
|
|
|
|
void do_notify_resume(struct pt_regs *regs)
|
|
{
|
|
clear_thread_flag(TIF_NOTIFY_RESUME);
|
|
tracehook_notify_resume(regs);
|
|
}
|