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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
50extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
51extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
52
53
54/* IRIX compatible stack_t */
55typedef struct sigaltstack32 {
56 s32 ss_sp;
57 compat_size_t ss_size;
58 int ss_flags;
59} stack32_t;
60
61struct 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
69struct 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
76extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
77
78asmlinkage 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
97asmlinkage 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(®s, &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" (®s));
145 /* Unreached */
146
147badframe:
148 force_sig(SIGSEGV, current);
149}
150
151static 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
204give_sigsegv:
205 force_sigsegv(signr, current);
206 return -EFAULT;
207}
208
209struct 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};
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
42#include "signal-common.h"
43
44/*
45 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
46 */
47#define __NR_N32_restart_syscall 6214
48
49extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
50extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
51
52struct ucontextn32 {
53 u32 uc_flags;
54 s32 uc_link;
55 compat_stack_t uc_stack;
56 struct sigcontext uc_mcontext;
57 compat_sigset_t uc_sigmask; /* mask last for extensibility */
58};
59
60struct rt_sigframe_n32 {
61 u32 rs_ass[4]; /* argument save space for o32 */
62 u32 rs_pad[2]; /* Was: signal trampoline */
63 struct compat_siginfo rs_info;
64 struct ucontextn32 rs_uc;
65};
66
67asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
68{
69 struct rt_sigframe_n32 __user *frame;
70 sigset_t set;
71 int sig;
72
73 frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
74 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
75 goto badframe;
76 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
77 goto badframe;
78
79 set_current_blocked(&set);
80
81 sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext);
82 if (sig < 0)
83 goto badframe;
84 else if (sig)
85 force_sig(sig, current);
86
87 if (compat_restore_altstack(&frame->rs_uc.uc_stack))
88 goto badframe;
89
90 /*
91 * Don't let your children do this ...
92 */
93 __asm__ __volatile__(
94 "move\t$29, %0\n\t"
95 "j\tsyscall_exit"
96 :/* no outputs */
97 :"r" (®s));
98 /* Unreached */
99
100badframe:
101 force_sig(SIGSEGV, current);
102}
103
104static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksig,
105 struct pt_regs *regs, sigset_t *set)
106{
107 struct rt_sigframe_n32 __user *frame;
108 int err = 0;
109
110 frame = get_sigframe(ksig, regs, sizeof(*frame));
111 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
112 return -EFAULT;
113
114 /* Create siginfo. */
115 err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
116
117 /* Create the ucontext. */
118 err |= __put_user(0, &frame->rs_uc.uc_flags);
119 err |= __put_user(0, &frame->rs_uc.uc_link);
120 err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
121 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
122 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
123
124 if (err)
125 return -EFAULT;
126
127 /*
128 * Arguments to signal handler:
129 *
130 * a0 = signal number
131 * a1 = 0 (should be cause)
132 * a2 = pointer to ucontext
133 *
134 * $25 and c0_epc point to the signal handler, $29 points to
135 * the struct rt_sigframe.
136 */
137 regs->regs[ 4] = ksig->sig;
138 regs->regs[ 5] = (unsigned long) &frame->rs_info;
139 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
140 regs->regs[29] = (unsigned long) frame;
141 regs->regs[31] = (unsigned long) sig_return;
142 regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
143
144 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
145 current->comm, current->pid,
146 frame, regs->cp0_epc, regs->regs[31]);
147
148 return 0;
149}
150
151struct mips_abi mips_abi_n32 = {
152 .setup_rt_frame = setup_rt_frame_n32,
153 .restart = __NR_N32_restart_syscall,
154
155 .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs),
156 .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr),
157 .off_sc_used_math = offsetof(struct sigcontext, sc_used_math),
158
159 .vdso = &vdso_image_n32,
160};