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

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  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 
 54 /* IRIX compatible stack_t  */
 55 typedef struct sigaltstack32 {
 56         s32 ss_sp;
 57         compat_size_t ss_size;
 58         int ss_flags;
 59 } stack32_t;
 60 
 61 struct ucontextn32 {
 62         u32                 uc_flags;
 63         s32                 uc_link;
 64         stack32_t           uc_stack;
 65         struct sigcontext   uc_mcontext;
 66         compat_sigset_t     uc_sigmask;   /* mask last for extensibility */
 67 };
 68 
 69 struct rt_sigframe_n32 {
 70         u32 rs_ass[4];                  /* argument save space for o32 */
 71         u32 rs_pad[2];                  /* Was: signal trampoline */
 72         struct compat_siginfo rs_info;
 73         struct ucontextn32 rs_uc;
 74 };
 75 
 76 extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
 77 
 78 asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
 79 {
 80         compat_sigset_t __user *unewset;
 81         compat_sigset_t uset;
 82         size_t sigsetsize;
 83         sigset_t newset;
 84 
 85         /* XXX Don't preclude handling different sized sigset_t's.  */
 86         sigsetsize = regs.regs[5];
 87         if (sigsetsize != sizeof(sigset_t))
 88                 return -EINVAL;
 89 
 90         unewset = (compat_sigset_t __user *) regs.regs[4];
 91         if (copy_from_user(&uset, unewset, sizeof(uset)))
 92                 return -EFAULT;
 93         sigset_from_compat(&newset, &uset);
 94         return sigsuspend(&newset);
 95 }
 96 
 97 asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
 98 {
 99         struct rt_sigframe_n32 __user *frame;
100         mm_segment_t old_fs;
101         sigset_t set;
102         stack_t st;
103         s32 sp;
104         int sig;
105 
106         frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
107         if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
108                 goto badframe;
109         if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
110                 goto badframe;
111 
112         set_current_blocked(&set);
113 
114         sig = restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext);
115         if (sig < 0)
116                 goto badframe;
117         else if (sig)
118                 force_sig(sig, current);
119 
120         /* The ucontext contains a stack32_t, so we must convert!  */
121         if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
122                 goto badframe;
123         st.ss_sp = (void __user *)(long) sp;
124         if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
125                 goto badframe;
126         if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
127                 goto badframe;
128 
129         /* It is more difficult to avoid calling this function than to
130            call it and ignore errors.  */
131         old_fs = get_fs();
132         set_fs(KERNEL_DS);
133         do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
134         set_fs(old_fs);
135 
136 
137         /*
138          * Don't let your children do this ...
139          */
140         __asm__ __volatile__(
141                 "move\t$29, %0\n\t"
142                 "j\tsyscall_exit"
143                 :/* no outputs */
144                 :"r" (&regs));
145         /* Unreached */
146 
147 badframe:
148         force_sig(SIGSEGV, current);
149 }
150 
151 static int setup_rt_frame_n32(void *sig_return, struct k_sigaction *ka,
152         struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info)
153 {
154         struct rt_sigframe_n32 __user *frame;
155         int err = 0;
156         s32 sp;
157 
158         frame = get_sigframe(ka, regs, sizeof(*frame));
159         if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
160                 goto give_sigsegv;
161 
162         /* Create siginfo.  */
163         err |= copy_siginfo_to_user32(&frame->rs_info, info);
164 
165         /* Create the ucontext.  */
166         err |= __put_user(0, &frame->rs_uc.uc_flags);
167         err |= __put_user(0, &frame->rs_uc.uc_link);
168         sp = (int) (long) current->sas_ss_sp;
169         err |= __put_user(sp,
170                           &frame->rs_uc.uc_stack.ss_sp);
171         err |= __put_user(sas_ss_flags(regs->regs[29]),
172                           &frame->rs_uc.uc_stack.ss_flags);
173         err |= __put_user(current->sas_ss_size,
174                           &frame->rs_uc.uc_stack.ss_size);
175         err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
176         err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
177 
178         if (err)
179                 goto give_sigsegv;
180 
181         /*
182          * Arguments to signal handler:
183          *
184          *   a0 = signal number
185          *   a1 = 0 (should be cause)
186          *   a2 = pointer to ucontext
187          *
188          * $25 and c0_epc point to the signal handler, $29 points to
189          * the struct rt_sigframe.
190          */
191         regs->regs[ 4] = signr;
192         regs->regs[ 5] = (unsigned long) &frame->rs_info;
193         regs->regs[ 6] = (unsigned long) &frame->rs_uc;
194         regs->regs[29] = (unsigned long) frame;
195         regs->regs[31] = (unsigned long) sig_return;
196         regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
197 
198         DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
199                current->comm, current->pid,
200                frame, regs->cp0_epc, regs->regs[31]);
201 
202         return 0;
203 
204 give_sigsegv:
205         force_sigsegv(signr, current);
206         return -EFAULT;
207 }
208 
209 struct mips_abi mips_abi_n32 = {
210         .setup_rt_frame = setup_rt_frame_n32,
211         .rt_signal_return_offset =
212                 offsetof(struct mips_vdso, n32_rt_signal_trampoline),
213         .restart        = __NR_N32_restart_syscall
214 };
215 

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