~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/mips/kernel/signal_n32.c

Version: ~ [ linux-5.12-rc1 ] ~ [ linux-5.11.2 ] ~ [ linux-5.10.19 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.101 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.177 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.222 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.258 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.258 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Copyright (C) 2003 Broadcom Corporation
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of the GNU General Public License
  6  * as published by the Free Software Foundation; either version 2
  7  * of the License, or (at your option) any later version.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write to the Free Software
 16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 17  */
 18 #include <linux/cache.h>
 19 #include <linux/sched.h>
 20 #include <linux/mm.h>
 21 #include <linux/smp.h>
 22 #include <linux/kernel.h>
 23 #include <linux/signal.h>
 24 #include <linux/errno.h>
 25 #include <linux/wait.h>
 26 #include <linux/ptrace.h>
 27 #include <linux/unistd.h>
 28 #include <linux/compat.h>
 29 #include <linux/bitops.h>
 30 
 31 #include <asm/abi.h>
 32 #include <asm/asm.h>
 33 #include <asm/cacheflush.h>
 34 #include <asm/compat-signal.h>
 35 #include <asm/sim.h>
 36 #include <asm/uaccess.h>
 37 #include <asm/ucontext.h>
 38 #include <asm/fpu.h>
 39 #include <asm/cpu-features.h>
 40 #include <asm/war.h>
 41 #include <asm/vdso.h>
 42 
 43 #include "signal-common.h"
 44 
 45 /*
 46  * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
 47  */
 48 #define __NR_N32_restart_syscall        6214
 49 
 50 extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
 51 extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
 52 
 53 struct ucontextn32 {
 54         u32                 uc_flags;
 55         s32                 uc_link;
 56         compat_stack_t      uc_stack;
 57         struct sigcontext   uc_mcontext;
 58         compat_sigset_t     uc_sigmask;   /* mask last for extensibility */
 59 };
 60 
 61 struct rt_sigframe_n32 {
 62         u32 rs_ass[4];                  /* argument save space for o32 */
 63         u32 rs_pad[2];                  /* Was: signal trampoline */
 64         struct compat_siginfo rs_info;
 65         struct ucontextn32 rs_uc;
 66 };
 67 
 68 asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
 69 {
 70         struct rt_sigframe_n32 __user *frame;
 71         sigset_t set;
 72         int sig;
 73 
 74         frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
 75         if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
 76                 goto badframe;
 77         if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
 78                 goto badframe;
 79 
 80         set_current_blocked(&set);
 81 
 82         sig = restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext);
 83         if (sig < 0)
 84                 goto badframe;
 85         else if (sig)
 86                 force_sig(sig, current);
 87 
 88         if (compat_restore_altstack(&frame->rs_uc.uc_stack))
 89                 goto badframe;
 90 
 91         /*
 92          * Don't let your children do this ...
 93          */
 94         __asm__ __volatile__(
 95                 "move\t$29, %0\n\t"
 96                 "j\tsyscall_exit"
 97                 :/* no outputs */
 98                 :"r" (&regs));
 99         /* Unreached */
100 
101 badframe:
102         force_sig(SIGSEGV, current);
103 }
104 
105 static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksig,
106                               struct pt_regs *regs, sigset_t *set)
107 {
108         struct rt_sigframe_n32 __user *frame;
109         int err = 0;
110 
111         frame = get_sigframe(ksig, regs, sizeof(*frame));
112         if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
113                 return -EFAULT;
114 
115         /* Create siginfo.  */
116         err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
117 
118         /* Create the ucontext.  */
119         err |= __put_user(0, &frame->rs_uc.uc_flags);
120         err |= __put_user(0, &frame->rs_uc.uc_link);
121         err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
122         err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
123         err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
124 
125         if (err)
126                 return -EFAULT;
127 
128         /*
129          * Arguments to signal handler:
130          *
131          *   a0 = signal number
132          *   a1 = 0 (should be cause)
133          *   a2 = pointer to ucontext
134          *
135          * $25 and c0_epc point to the signal handler, $29 points to
136          * the struct rt_sigframe.
137          */
138         regs->regs[ 4] = ksig->sig;
139         regs->regs[ 5] = (unsigned long) &frame->rs_info;
140         regs->regs[ 6] = (unsigned long) &frame->rs_uc;
141         regs->regs[29] = (unsigned long) frame;
142         regs->regs[31] = (unsigned long) sig_return;
143         regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
144 
145         DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
146                current->comm, current->pid,
147                frame, regs->cp0_epc, regs->regs[31]);
148 
149         return 0;
150 }
151 
152 struct mips_abi mips_abi_n32 = {
153         .setup_rt_frame = setup_rt_frame_n32,
154         .rt_signal_return_offset =
155                 offsetof(struct mips_vdso, n32_rt_signal_trampoline),
156         .restart        = __NR_N32_restart_syscall
157 };
158 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp