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

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

Version: ~ [ linux-5.15-rc7 ] ~ [ linux-5.14.14 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.75 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.155 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.213 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.252 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.287 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.289 ] ~ [ 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 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * Copyright (C) 2003 Broadcom Corporation
  4  */
  5 #include <linux/cache.h>
  6 #include <linux/sched.h>
  7 #include <linux/mm.h>
  8 #include <linux/smp.h>
  9 #include <linux/kernel.h>
 10 #include <linux/signal.h>
 11 #include <linux/errno.h>
 12 #include <linux/wait.h>
 13 #include <linux/ptrace.h>
 14 #include <linux/unistd.h>
 15 #include <linux/compat.h>
 16 #include <linux/bitops.h>
 17 
 18 #include <asm/abi.h>
 19 #include <asm/asm.h>
 20 #include <asm/cacheflush.h>
 21 #include <asm/compat-signal.h>
 22 #include <asm/sim.h>
 23 #include <linux/uaccess.h>
 24 #include <asm/ucontext.h>
 25 #include <asm/fpu.h>
 26 #include <asm/cpu-features.h>
 27 #include <asm/war.h>
 28 
 29 #include "signal-common.h"
 30 
 31 /*
 32  * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
 33  */
 34 #define __NR_N32_restart_syscall        6214
 35 
 36 extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
 37 extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
 38 
 39 struct ucontextn32 {
 40         u32                 uc_flags;
 41         s32                 uc_link;
 42         compat_stack_t      uc_stack;
 43         struct sigcontext   uc_mcontext;
 44         compat_sigset_t     uc_sigmask;   /* mask last for extensibility */
 45 };
 46 
 47 struct rt_sigframe_n32 {
 48         u32 rs_ass[4];                  /* argument save space for o32 */
 49         u32 rs_pad[2];                  /* Was: signal trampoline */
 50         struct compat_siginfo rs_info;
 51         struct ucontextn32 rs_uc;
 52 };
 53 
 54 asmlinkage void sysn32_rt_sigreturn(void)
 55 {
 56         struct rt_sigframe_n32 __user *frame;
 57         struct pt_regs *regs;
 58         sigset_t set;
 59         int sig;
 60 
 61         regs = current_pt_regs();
 62         frame = (struct rt_sigframe_n32 __user *)regs->regs[29];
 63         if (!access_ok(frame, sizeof(*frame)))
 64                 goto badframe;
 65         if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
 66                 goto badframe;
 67 
 68         set_current_blocked(&set);
 69 
 70         sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
 71         if (sig < 0)
 72                 goto badframe;
 73         else if (sig)
 74                 force_sig(sig);
 75 
 76         if (compat_restore_altstack(&frame->rs_uc.uc_stack))
 77                 goto badframe;
 78 
 79         /*
 80          * Don't let your children do this ...
 81          */
 82         __asm__ __volatile__(
 83                 "move\t$29, %0\n\t"
 84                 "j\tsyscall_exit"
 85                 : /* no outputs */
 86                 : "r" (regs));
 87         /* Unreached */
 88 
 89 badframe:
 90         force_sig(SIGSEGV);
 91 }
 92 
 93 static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksig,
 94                               struct pt_regs *regs, sigset_t *set)
 95 {
 96         struct rt_sigframe_n32 __user *frame;
 97         int err = 0;
 98 
 99         frame = get_sigframe(ksig, regs, sizeof(*frame));
100         if (!access_ok(frame, sizeof (*frame)))
101                 return -EFAULT;
102 
103         /* Create siginfo.  */
104         err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
105 
106         /* Create the ucontext.  */
107         err |= __put_user(0, &frame->rs_uc.uc_flags);
108         err |= __put_user(0, &frame->rs_uc.uc_link);
109         err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
110         err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
111         err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
112 
113         if (err)
114                 return -EFAULT;
115 
116         /*
117          * Arguments to signal handler:
118          *
119          *   a0 = signal number
120          *   a1 = 0 (should be cause)
121          *   a2 = pointer to ucontext
122          *
123          * $25 and c0_epc point to the signal handler, $29 points to
124          * the struct rt_sigframe.
125          */
126         regs->regs[ 4] = ksig->sig;
127         regs->regs[ 5] = (unsigned long) &frame->rs_info;
128         regs->regs[ 6] = (unsigned long) &frame->rs_uc;
129         regs->regs[29] = (unsigned long) frame;
130         regs->regs[31] = (unsigned long) sig_return;
131         regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
132 
133         DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
134                current->comm, current->pid,
135                frame, regs->cp0_epc, regs->regs[31]);
136 
137         return 0;
138 }
139 
140 struct mips_abi mips_abi_n32 = {
141         .setup_rt_frame = setup_rt_frame_n32,
142         .restart        = __NR_N32_restart_syscall,
143 
144         .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs),
145         .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr),
146         .off_sc_used_math = offsetof(struct sigcontext, sc_used_math),
147 
148         .vdso           = &vdso_image_n32,
149 };
150 

~ [ 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