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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 <linux/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};
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/syscalls.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
36struct ucontextn32 {
37 u32 uc_flags;
38 s32 uc_link;
39 compat_stack_t uc_stack;
40 struct sigcontext uc_mcontext;
41 compat_sigset_t uc_sigmask; /* mask last for extensibility */
42};
43
44struct rt_sigframe_n32 {
45 u32 rs_ass[4]; /* argument save space for o32 */
46 u32 rs_pad[2]; /* Was: signal trampoline */
47 struct compat_siginfo rs_info;
48 struct ucontextn32 rs_uc;
49};
50
51asmlinkage void sysn32_rt_sigreturn(void)
52{
53 struct rt_sigframe_n32 __user *frame;
54 struct pt_regs *regs;
55 sigset_t set;
56 int sig;
57
58 regs = current_pt_regs();
59 frame = (struct rt_sigframe_n32 __user *)regs->regs[29];
60 if (!access_ok(frame, sizeof(*frame)))
61 goto badframe;
62 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
63 goto badframe;
64
65 set_current_blocked(&set);
66
67 sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
68 if (sig < 0)
69 goto badframe;
70 else if (sig)
71 force_sig(sig);
72
73 if (compat_restore_altstack(&frame->rs_uc.uc_stack))
74 goto badframe;
75
76 /*
77 * Don't let your children do this ...
78 */
79 __asm__ __volatile__(
80 "move\t$29, %0\n\t"
81 "j\tsyscall_exit"
82 : /* no outputs */
83 : "r" (regs));
84 /* Unreached */
85
86badframe:
87 force_sig(SIGSEGV);
88}
89
90static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksig,
91 struct pt_regs *regs, sigset_t *set)
92{
93 struct rt_sigframe_n32 __user *frame;
94 int err = 0;
95
96 frame = get_sigframe(ksig, regs, sizeof(*frame));
97 if (!access_ok(frame, sizeof (*frame)))
98 return -EFAULT;
99
100 /* Create siginfo. */
101 err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
102
103 /* Create the ucontext. */
104 err |= __put_user(0, &frame->rs_uc.uc_flags);
105 err |= __put_user(0, &frame->rs_uc.uc_link);
106 err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
107 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
108 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
109
110 if (err)
111 return -EFAULT;
112
113 /*
114 * Arguments to signal handler:
115 *
116 * a0 = signal number
117 * a1 = 0 (should be cause)
118 * a2 = pointer to ucontext
119 *
120 * $25 and c0_epc point to the signal handler, $29 points to
121 * the struct rt_sigframe.
122 */
123 regs->regs[ 4] = ksig->sig;
124 regs->regs[ 5] = (unsigned long) &frame->rs_info;
125 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
126 regs->regs[29] = (unsigned long) frame;
127 regs->regs[31] = (unsigned long) sig_return;
128 regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
129
130 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
131 current->comm, current->pid,
132 frame, regs->cp0_epc, regs->regs[31]);
133
134 return 0;
135}
136
137struct mips_abi mips_abi_n32 = {
138 .setup_rt_frame = setup_rt_frame_n32,
139 .restart = __NR_N32_restart_syscall,
140
141 .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs),
142 .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr),
143 .off_sc_used_math = offsetof(struct sigcontext, sc_used_math),
144
145 .vdso = &vdso_image_n32,
146};