423 lines
12 KiB
C
423 lines
12 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* Copyright IBM Corp. 2000, 2006
|
||
|
|
* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
|
||
|
|
* Gerhard Tonn (ton@de.ibm.com)
|
||
|
|
*
|
||
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
||
|
|
*
|
||
|
|
* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/compat.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/sched/task_stack.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <linux/smp.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/signal.h>
|
||
|
|
#include <linux/errno.h>
|
||
|
|
#include <linux/wait.h>
|
||
|
|
#include <linux/ptrace.h>
|
||
|
|
#include <linux/unistd.h>
|
||
|
|
#include <linux/stddef.h>
|
||
|
|
#include <linux/tty.h>
|
||
|
|
#include <linux/personality.h>
|
||
|
|
#include <linux/binfmts.h>
|
||
|
|
#include <asm/ucontext.h>
|
||
|
|
#include <linux/uaccess.h>
|
||
|
|
#include <asm/lowcore.h>
|
||
|
|
#include <asm/switch_to.h>
|
||
|
|
#include <asm/vdso.h>
|
||
|
|
#include "compat_linux.h"
|
||
|
|
#include "compat_ptrace.h"
|
||
|
|
#include "entry.h"
|
||
|
|
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
|
||
|
|
struct sigcontext32 sc;
|
||
|
|
_sigregs32 sregs;
|
||
|
|
int signo;
|
||
|
|
_sigregs_ext32 sregs_ext;
|
||
|
|
__u16 svc_insn; /* Offset of svc_insn is NOT fixed! */
|
||
|
|
} sigframe32;
|
||
|
|
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
|
||
|
|
__u16 svc_insn;
|
||
|
|
compat_siginfo_t info;
|
||
|
|
struct ucontext32 uc;
|
||
|
|
} rt_sigframe32;
|
||
|
|
|
||
|
|
/* Store registers needed to create the signal frame */
|
||
|
|
static void store_sigregs(void)
|
||
|
|
{
|
||
|
|
save_access_regs(current->thread.acrs);
|
||
|
|
save_fpu_regs();
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Load registers after signal return */
|
||
|
|
static void load_sigregs(void)
|
||
|
|
{
|
||
|
|
restore_access_regs(current->thread.acrs);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
|
||
|
|
{
|
||
|
|
_sigregs32 user_sregs;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
user_sregs.regs.psw.mask = (__u32)(regs->psw.mask >> 32);
|
||
|
|
user_sregs.regs.psw.mask &= PSW32_MASK_USER | PSW32_MASK_RI;
|
||
|
|
user_sregs.regs.psw.mask |= PSW32_USER_BITS;
|
||
|
|
user_sregs.regs.psw.addr = (__u32) regs->psw.addr |
|
||
|
|
(__u32)(regs->psw.mask & PSW_MASK_BA);
|
||
|
|
for (i = 0; i < NUM_GPRS; i++)
|
||
|
|
user_sregs.regs.gprs[i] = (__u32) regs->gprs[i];
|
||
|
|
memcpy(&user_sregs.regs.acrs, current->thread.acrs,
|
||
|
|
sizeof(user_sregs.regs.acrs));
|
||
|
|
fpregs_store((_s390_fp_regs *) &user_sregs.fpregs, ¤t->thread.fpu);
|
||
|
|
if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs32)))
|
||
|
|
return -EFAULT;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
|
||
|
|
{
|
||
|
|
_sigregs32 user_sregs;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/* Always make any pending restarted system call return -EINTR */
|
||
|
|
current->restart_block.fn = do_no_restart_syscall;
|
||
|
|
|
||
|
|
if (__copy_from_user(&user_sregs, &sregs->regs, sizeof(user_sregs)))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW32_MASK_RI))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
/* Test the floating-point-control word. */
|
||
|
|
if (test_fp_ctl(user_sregs.fpregs.fpc))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
/* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */
|
||
|
|
regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) |
|
||
|
|
(__u64)(user_sregs.regs.psw.mask & PSW32_MASK_USER) << 32 |
|
||
|
|
(__u64)(user_sregs.regs.psw.mask & PSW32_MASK_RI) << 32 |
|
||
|
|
(__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_AMODE);
|
||
|
|
/* Check for invalid user address space control. */
|
||
|
|
if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME)
|
||
|
|
regs->psw.mask = PSW_ASC_PRIMARY |
|
||
|
|
(regs->psw.mask & ~PSW_MASK_ASC);
|
||
|
|
regs->psw.addr = (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_INSN);
|
||
|
|
for (i = 0; i < NUM_GPRS; i++)
|
||
|
|
regs->gprs[i] = (__u64) user_sregs.regs.gprs[i];
|
||
|
|
memcpy(¤t->thread.acrs, &user_sregs.regs.acrs,
|
||
|
|
sizeof(current->thread.acrs));
|
||
|
|
fpregs_load((_s390_fp_regs *) &user_sregs.fpregs, ¤t->thread.fpu);
|
||
|
|
|
||
|
|
clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int save_sigregs_ext32(struct pt_regs *regs,
|
||
|
|
_sigregs_ext32 __user *sregs_ext)
|
||
|
|
{
|
||
|
|
__u32 gprs_high[NUM_GPRS];
|
||
|
|
__u64 vxrs[__NUM_VXRS_LOW];
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/* Save high gprs to signal stack */
|
||
|
|
for (i = 0; i < NUM_GPRS; i++)
|
||
|
|
gprs_high[i] = regs->gprs[i] >> 32;
|
||
|
|
if (__copy_to_user(&sregs_ext->gprs_high, &gprs_high,
|
||
|
|
sizeof(sregs_ext->gprs_high)))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Save vector registers to signal stack */
|
||
|
|
if (MACHINE_HAS_VX) {
|
||
|
|
for (i = 0; i < __NUM_VXRS_LOW; i++)
|
||
|
|
vxrs[i] = *((__u64 *)(current->thread.fpu.vxrs + i) + 1);
|
||
|
|
if (__copy_to_user(&sregs_ext->vxrs_low, vxrs,
|
||
|
|
sizeof(sregs_ext->vxrs_low)) ||
|
||
|
|
__copy_to_user(&sregs_ext->vxrs_high,
|
||
|
|
current->thread.fpu.vxrs + __NUM_VXRS_LOW,
|
||
|
|
sizeof(sregs_ext->vxrs_high)))
|
||
|
|
return -EFAULT;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int restore_sigregs_ext32(struct pt_regs *regs,
|
||
|
|
_sigregs_ext32 __user *sregs_ext)
|
||
|
|
{
|
||
|
|
__u32 gprs_high[NUM_GPRS];
|
||
|
|
__u64 vxrs[__NUM_VXRS_LOW];
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/* Restore high gprs from signal stack */
|
||
|
|
if (__copy_from_user(&gprs_high, &sregs_ext->gprs_high,
|
||
|
|
sizeof(sregs_ext->gprs_high)))
|
||
|
|
return -EFAULT;
|
||
|
|
for (i = 0; i < NUM_GPRS; i++)
|
||
|
|
*(__u32 *)®s->gprs[i] = gprs_high[i];
|
||
|
|
|
||
|
|
/* Restore vector registers from signal stack */
|
||
|
|
if (MACHINE_HAS_VX) {
|
||
|
|
if (__copy_from_user(vxrs, &sregs_ext->vxrs_low,
|
||
|
|
sizeof(sregs_ext->vxrs_low)) ||
|
||
|
|
__copy_from_user(current->thread.fpu.vxrs + __NUM_VXRS_LOW,
|
||
|
|
&sregs_ext->vxrs_high,
|
||
|
|
sizeof(sregs_ext->vxrs_high)))
|
||
|
|
return -EFAULT;
|
||
|
|
for (i = 0; i < __NUM_VXRS_LOW; i++)
|
||
|
|
*((__u64 *)(current->thread.fpu.vxrs + i) + 1) = vxrs[i];
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
COMPAT_SYSCALL_DEFINE0(sigreturn)
|
||
|
|
{
|
||
|
|
struct pt_regs *regs = task_pt_regs(current);
|
||
|
|
sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
|
||
|
|
sigset_t set;
|
||
|
|
|
||
|
|
if (get_compat_sigset(&set, (compat_sigset_t __user *)frame->sc.oldmask))
|
||
|
|
goto badframe;
|
||
|
|
set_current_blocked(&set);
|
||
|
|
save_fpu_regs();
|
||
|
|
if (restore_sigregs32(regs, &frame->sregs))
|
||
|
|
goto badframe;
|
||
|
|
if (restore_sigregs_ext32(regs, &frame->sregs_ext))
|
||
|
|
goto badframe;
|
||
|
|
load_sigregs();
|
||
|
|
return regs->gprs[2];
|
||
|
|
badframe:
|
||
|
|
force_sig(SIGSEGV);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
|
||
|
|
{
|
||
|
|
struct pt_regs *regs = task_pt_regs(current);
|
||
|
|
rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
|
||
|
|
sigset_t set;
|
||
|
|
|
||
|
|
if (get_compat_sigset(&set, &frame->uc.uc_sigmask))
|
||
|
|
goto badframe;
|
||
|
|
set_current_blocked(&set);
|
||
|
|
if (compat_restore_altstack(&frame->uc.uc_stack))
|
||
|
|
goto badframe;
|
||
|
|
save_fpu_regs();
|
||
|
|
if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
|
||
|
|
goto badframe;
|
||
|
|
if (restore_sigregs_ext32(regs, &frame->uc.uc_mcontext_ext))
|
||
|
|
goto badframe;
|
||
|
|
load_sigregs();
|
||
|
|
return regs->gprs[2];
|
||
|
|
badframe:
|
||
|
|
force_sig(SIGSEGV);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Set up a signal frame.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Determine which stack to use..
|
||
|
|
*/
|
||
|
|
static inline void __user *
|
||
|
|
get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
|
||
|
|
{
|
||
|
|
unsigned long sp;
|
||
|
|
|
||
|
|
/* Default to using normal stack */
|
||
|
|
sp = (unsigned long) A(regs->gprs[15]);
|
||
|
|
|
||
|
|
/* Overflow on alternate signal stack gives SIGSEGV. */
|
||
|
|
if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
|
||
|
|
return (void __user *) -1UL;
|
||
|
|
|
||
|
|
/* This is the X/Open sanctioned signal stack switching. */
|
||
|
|
if (ka->sa.sa_flags & SA_ONSTACK) {
|
||
|
|
if (! sas_ss_flags(sp))
|
||
|
|
sp = current->sas_ss_sp + current->sas_ss_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
return (void __user *)((sp - frame_size) & -8ul);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int setup_frame32(struct ksignal *ksig, sigset_t *set,
|
||
|
|
struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
int sig = ksig->sig;
|
||
|
|
sigframe32 __user *frame;
|
||
|
|
unsigned long restorer;
|
||
|
|
size_t frame_size;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* gprs_high are always present for 31-bit compat tasks.
|
||
|
|
* The space for vector registers is only allocated if
|
||
|
|
* the machine supports it
|
||
|
|
*/
|
||
|
|
frame_size = sizeof(*frame) - sizeof(frame->sregs_ext.__reserved);
|
||
|
|
if (!MACHINE_HAS_VX)
|
||
|
|
frame_size -= sizeof(frame->sregs_ext.vxrs_low) +
|
||
|
|
sizeof(frame->sregs_ext.vxrs_high);
|
||
|
|
frame = get_sigframe(&ksig->ka, regs, frame_size);
|
||
|
|
if (frame == (void __user *) -1UL)
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Set up backchain. */
|
||
|
|
if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Create struct sigcontext32 on the signal stack */
|
||
|
|
if (put_compat_sigset((compat_sigset_t __user *)frame->sc.oldmask,
|
||
|
|
set, sizeof(compat_sigset_t)))
|
||
|
|
return -EFAULT;
|
||
|
|
if (__put_user(ptr_to_compat(&frame->sregs), &frame->sc.sregs))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Store registers needed to create the signal frame */
|
||
|
|
store_sigregs();
|
||
|
|
|
||
|
|
/* Create _sigregs32 on the signal stack */
|
||
|
|
if (save_sigregs32(regs, &frame->sregs))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Place signal number on stack to allow backtrace from handler. */
|
||
|
|
if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Create _sigregs_ext32 on the signal stack */
|
||
|
|
if (save_sigregs_ext32(regs, &frame->sregs_ext))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Set up to return from userspace. If provided, use a stub
|
||
|
|
already in userspace. */
|
||
|
|
if (ksig->ka.sa.sa_flags & SA_RESTORER) {
|
||
|
|
restorer = (unsigned long __force)
|
||
|
|
ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
|
||
|
|
} else {
|
||
|
|
restorer = VDSO32_SYMBOL(current, sigreturn);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set up registers for signal handler */
|
||
|
|
regs->gprs[14] = restorer;
|
||
|
|
regs->gprs[15] = (__force __u64) frame;
|
||
|
|
/* Force 31 bit amode and default user address space control. */
|
||
|
|
regs->psw.mask = PSW_MASK_BA |
|
||
|
|
(PSW_USER_BITS & PSW_MASK_ASC) |
|
||
|
|
(regs->psw.mask & ~PSW_MASK_ASC);
|
||
|
|
regs->psw.addr = (__force __u64) ksig->ka.sa.sa_handler;
|
||
|
|
|
||
|
|
regs->gprs[2] = sig;
|
||
|
|
regs->gprs[3] = (__force __u64) &frame->sc;
|
||
|
|
|
||
|
|
/* We forgot to include these in the sigcontext.
|
||
|
|
To avoid breaking binary compatibility, they are passed as args. */
|
||
|
|
if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
|
||
|
|
sig == SIGTRAP || sig == SIGFPE) {
|
||
|
|
/* set extra registers only for synchronous signals */
|
||
|
|
regs->gprs[4] = regs->int_code & 127;
|
||
|
|
regs->gprs[5] = regs->int_parm_long;
|
||
|
|
regs->gprs[6] = current->thread.last_break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int setup_rt_frame32(struct ksignal *ksig, sigset_t *set,
|
||
|
|
struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
rt_sigframe32 __user *frame;
|
||
|
|
unsigned long restorer;
|
||
|
|
size_t frame_size;
|
||
|
|
u32 uc_flags;
|
||
|
|
|
||
|
|
frame_size = sizeof(*frame) -
|
||
|
|
sizeof(frame->uc.uc_mcontext_ext.__reserved);
|
||
|
|
/*
|
||
|
|
* gprs_high are always present for 31-bit compat tasks.
|
||
|
|
* The space for vector registers is only allocated if
|
||
|
|
* the machine supports it
|
||
|
|
*/
|
||
|
|
uc_flags = UC_GPRS_HIGH;
|
||
|
|
if (MACHINE_HAS_VX) {
|
||
|
|
uc_flags |= UC_VXRS;
|
||
|
|
} else
|
||
|
|
frame_size -= sizeof(frame->uc.uc_mcontext_ext.vxrs_low) +
|
||
|
|
sizeof(frame->uc.uc_mcontext_ext.vxrs_high);
|
||
|
|
frame = get_sigframe(&ksig->ka, regs, frame_size);
|
||
|
|
if (frame == (void __user *) -1UL)
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Set up backchain. */
|
||
|
|
if (__put_user(regs->gprs[15], (unsigned int __force __user *) frame))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Set up to return from userspace. If provided, use a stub
|
||
|
|
already in userspace. */
|
||
|
|
if (ksig->ka.sa.sa_flags & SA_RESTORER) {
|
||
|
|
restorer = (unsigned long __force)
|
||
|
|
ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
|
||
|
|
} else {
|
||
|
|
restorer = VDSO32_SYMBOL(current, rt_sigreturn);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Create siginfo on the signal stack */
|
||
|
|
if (copy_siginfo_to_user32(&frame->info, &ksig->info))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Store registers needed to create the signal frame */
|
||
|
|
store_sigregs();
|
||
|
|
|
||
|
|
/* Create ucontext on the signal stack. */
|
||
|
|
if (__put_user(uc_flags, &frame->uc.uc_flags) ||
|
||
|
|
__put_user(0, &frame->uc.uc_link) ||
|
||
|
|
__compat_save_altstack(&frame->uc.uc_stack, regs->gprs[15]) ||
|
||
|
|
save_sigregs32(regs, &frame->uc.uc_mcontext) ||
|
||
|
|
put_compat_sigset(&frame->uc.uc_sigmask, set, sizeof(compat_sigset_t)) ||
|
||
|
|
save_sigregs_ext32(regs, &frame->uc.uc_mcontext_ext))
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/* Set up registers for signal handler */
|
||
|
|
regs->gprs[14] = restorer;
|
||
|
|
regs->gprs[15] = (__force __u64) frame;
|
||
|
|
/* Force 31 bit amode and default user address space control. */
|
||
|
|
regs->psw.mask = PSW_MASK_BA |
|
||
|
|
(PSW_USER_BITS & PSW_MASK_ASC) |
|
||
|
|
(regs->psw.mask & ~PSW_MASK_ASC);
|
||
|
|
regs->psw.addr = (__u64 __force) ksig->ka.sa.sa_handler;
|
||
|
|
|
||
|
|
regs->gprs[2] = ksig->sig;
|
||
|
|
regs->gprs[3] = (__force __u64) &frame->info;
|
||
|
|
regs->gprs[4] = (__force __u64) &frame->uc;
|
||
|
|
regs->gprs[5] = current->thread.last_break;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* OK, we're invoking a handler
|
||
|
|
*/
|
||
|
|
|
||
|
|
void handle_signal32(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_frame32(ksig, oldset, regs);
|
||
|
|
else
|
||
|
|
ret = setup_frame32(ksig, oldset, regs);
|
||
|
|
|
||
|
|
signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLE_STEP));
|
||
|
|
}
|
||
|
|
|