mips/kernel/signal32.c

0001 /*
0002  * This file is subject to the terms and conditions of the GNU General Public
0003  * License.  See the file "COPYING" in the main directory of this archive
0004  * for more details.
0005  *
0006  * Copyright (C) 1991, 1992  Linus Torvalds
0007  * Copyright (C) 1994 - 2000, 2006  Ralf Baechle
0008  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
0009  * Copyright (C) 2016, Imagination Technologies Ltd.
0010  */
0011 #include <linux/compat.h>
0012 #include <linux/compiler.h>
0013 #include <linux/errno.h>
0014 #include <linux/kernel.h>
0015 #include <linux/signal.h>
0016 #include <linux/syscalls.h>
0017
0018 #include <asm/compat-signal.h>
0019 #include <linux/uaccess.h>
0020 #include <asm/unistd.h>
0021
0022 #include "signal-common.h"
0023
0024 /* 32-bit compatibility types */
0025
0026 typedef unsigned int __sighandler32_t;
0027 typedef void (*vfptr_t)(void);
0028
0029 /*
0030  * Atomically swap in the new signal mask, and wait for a signal.
0031  */
0032
0033 asmlinkage int sys32_sigsuspend(compat_sigset_t __user *uset)
0034 {
0035     return compat_sys_rt_sigsuspend(uset, sizeof(compat_sigset_t));
0036 }
0037
0038 SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, act,
0039     struct compat_sigaction __user *, oact)
0040 {
0041     struct k_sigaction new_ka, old_ka;
0042     int ret;
0043     int err = 0;
0044
0045     if (act) {
0046         old_sigset_t mask;
0047         s32 handler;
0048
0049         if (!access_ok(act, sizeof(*act)))
0050             return -EFAULT;
0051         err |= __get_user(handler, &act->sa_handler);
0052         new_ka.sa.sa_handler = (void __user *)(s64)handler;
0053         err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
0054         err |= __get_user(mask, &act->sa_mask.sig[0]);
0055         if (err)
0056             return -EFAULT;
0057
0058         siginitset(&new_ka.sa.sa_mask, mask);
0059     }
0060
0061     ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
0062
0063     if (!ret && oact) {
0064         if (!access_ok(oact, sizeof(*oact)))
0065             return -EFAULT;
0066         err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
0067         err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
0068                   &oact->sa_handler);
0069         err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
0070         err |= __put_user(0, &oact->sa_mask.sig[1]);
0071         err |= __put_user(0, &oact->sa_mask.sig[2]);
0072         err |= __put_user(0, &oact->sa_mask.sig[3]);
0073         if (err)
0074             return -EFAULT;
0075     }
0076
0077     return ret;
0078 }