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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
36extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
37extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
38
39struct 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
47struct 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
54asmlinkage 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
89badframe:
90 force_sig(SIGSEGV);
91}
92
93static 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
140struct 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};
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};