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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * OpenRISC ptrace.c
4 *
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
7 * declaration.
8 *
9 * Modifications for the OpenRISC architecture:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2005 Gyorgy Jeney <nog@bsemi.com>
12 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
13 */
14
15#include <linux/kernel.h>
16#include <linux/sched.h>
17#include <linux/sched/task_stack.h>
18#include <linux/string.h>
19
20#include <linux/mm.h>
21#include <linux/errno.h>
22#include <linux/ptrace.h>
23#include <linux/audit.h>
24#include <linux/regset.h>
25#include <linux/elf.h>
26
27#include <asm/thread_info.h>
28#include <asm/page.h>
29
30/*
31 * Copy the thread state to a regset that can be interpreted by userspace.
32 *
33 * It doesn't matter what our internal pt_regs structure looks like. The
34 * important thing is that we export a consistent view of the thread state
35 * to userspace. As such, we need to make sure that the regset remains
36 * ABI compatible as defined by the struct user_regs_struct:
37 *
38 * (Each item is a 32-bit word)
39 * r0 = 0 (exported for clarity)
40 * 31 GPRS r1-r31
41 * PC (Program counter)
42 * SR (Supervision register)
43 */
44static int genregs_get(struct task_struct *target,
45 const struct user_regset *regset,
46 struct membuf to)
47{
48 const struct pt_regs *regs = task_pt_regs(target);
49
50 /* r0 */
51 membuf_zero(&to, 4);
52 membuf_write(&to, regs->gpr + 1, 31 * 4);
53 membuf_store(&to, regs->pc);
54 return membuf_store(&to, regs->sr);
55}
56
57/*
58 * Set the thread state from a regset passed in via ptrace
59 */
60static int genregs_set(struct task_struct *target,
61 const struct user_regset *regset,
62 unsigned int pos, unsigned int count,
63 const void *kbuf, const void __user * ubuf)
64{
65 struct pt_regs *regs = task_pt_regs(target);
66 int ret;
67
68 /* ignore r0 */
69 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
70 /* r1 - r31 */
71 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
72 regs->gpr+1, 4, 4*32);
73 /* PC */
74 if (!ret)
75 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
76 ®s->pc, 4*32, 4*33);
77 /*
78 * Skip SR and padding... userspace isn't allowed to changes bits in
79 * the Supervision register
80 */
81 if (!ret)
82 user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 4*33, -1);
83
84 return ret;
85}
86
87/*
88 * Define the register sets available on OpenRISC under Linux
89 */
90enum or1k_regset {
91 REGSET_GENERAL,
92};
93
94static const struct user_regset or1k_regsets[] = {
95 [REGSET_GENERAL] = {
96 .core_note_type = NT_PRSTATUS,
97 .n = ELF_NGREG,
98 .size = sizeof(long),
99 .align = sizeof(long),
100 .regset_get = genregs_get,
101 .set = genregs_set,
102 },
103};
104
105static const struct user_regset_view user_or1k_native_view = {
106 .name = "or1k",
107 .e_machine = EM_OPENRISC,
108 .regsets = or1k_regsets,
109 .n = ARRAY_SIZE(or1k_regsets),
110};
111
112const struct user_regset_view *task_user_regset_view(struct task_struct *task)
113{
114 return &user_or1k_native_view;
115}
116
117/*
118 * does not yet catch signals sent when the child dies.
119 * in exit.c or in signal.c.
120 */
121
122
123/*
124 * Called by kernel/ptrace.c when detaching..
125 *
126 * Make sure the single step bit is not set.
127 */
128void ptrace_disable(struct task_struct *child)
129{
130 pr_debug("ptrace_disable(): TODO\n");
131
132 user_disable_single_step(child);
133 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
134}
135
136long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
137 unsigned long data)
138{
139 int ret;
140
141 switch (request) {
142 default:
143 ret = ptrace_request(child, request, addr, data);
144 break;
145 }
146
147 return ret;
148}
149
150/*
151 * Notification of system call entry/exit
152 * - triggered by current->work.syscall_trace
153 */
154asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
155{
156 long ret = 0;
157
158 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
159 ptrace_report_syscall_entry(regs))
160 /*
161 * Tracing decided this syscall should not happen.
162 * We'll return a bogus call number to get an ENOSYS
163 * error, but leave the original number in <something>.
164 */
165 ret = -1L;
166
167 audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4],
168 regs->gpr[5], regs->gpr[6]);
169
170 return ret ? : regs->gpr[11];
171}
172
173asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
174{
175 int step;
176
177 audit_syscall_exit(regs);
178
179 step = test_thread_flag(TIF_SINGLESTEP);
180 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
181 ptrace_report_syscall_exit(regs, step);
182}
1/*
2 * OpenRISC ptrace.c
3 *
4 * Linux architectural port borrowing liberally from similar works of
5 * others. All original copyrights apply as per the original source
6 * declaration.
7 *
8 * Modifications for the OpenRISC architecture:
9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
10 * Copyright (C) 2005 Gyorgy Jeney <nog@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 */
18
19#include <linux/kernel.h>
20#include <linux/sched.h>
21#include <linux/sched/task_stack.h>
22#include <linux/string.h>
23
24#include <linux/mm.h>
25#include <linux/errno.h>
26#include <linux/ptrace.h>
27#include <linux/audit.h>
28#include <linux/regset.h>
29#include <linux/tracehook.h>
30#include <linux/elf.h>
31
32#include <asm/thread_info.h>
33#include <asm/segment.h>
34#include <asm/page.h>
35#include <asm/pgtable.h>
36
37/*
38 * Copy the thread state to a regset that can be interpreted by userspace.
39 *
40 * It doesn't matter what our internal pt_regs structure looks like. The
41 * important thing is that we export a consistent view of the thread state
42 * to userspace. As such, we need to make sure that the regset remains
43 * ABI compatible as defined by the struct user_regs_struct:
44 *
45 * (Each item is a 32-bit word)
46 * r0 = 0 (exported for clarity)
47 * 31 GPRS r1-r31
48 * PC (Program counter)
49 * SR (Supervision register)
50 */
51static int genregs_get(struct task_struct *target,
52 const struct user_regset *regset,
53 unsigned int pos, unsigned int count,
54 void *kbuf, void __user * ubuf)
55{
56 const struct pt_regs *regs = task_pt_regs(target);
57 int ret;
58
59 /* r0 */
60 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 0, 4);
61
62 if (!ret)
63 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
64 regs->gpr+1, 4, 4*32);
65 if (!ret)
66 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
67 ®s->pc, 4*32, 4*33);
68 if (!ret)
69 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
70 ®s->sr, 4*33, 4*34);
71 if (!ret)
72 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
73 4*34, -1);
74
75 return ret;
76}
77
78/*
79 * Set the thread state from a regset passed in via ptrace
80 */
81static int genregs_set(struct task_struct *target,
82 const struct user_regset *regset,
83 unsigned int pos, unsigned int count,
84 const void *kbuf, const void __user * ubuf)
85{
86 struct pt_regs *regs = task_pt_regs(target);
87 int ret;
88
89 /* ignore r0 */
90 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4);
91 /* r1 - r31 */
92 if (!ret)
93 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
94 regs->gpr+1, 4, 4*32);
95 /* PC */
96 if (!ret)
97 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
98 ®s->pc, 4*32, 4*33);
99 /*
100 * Skip SR and padding... userspace isn't allowed to changes bits in
101 * the Supervision register
102 */
103 if (!ret)
104 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
105 4*33, -1);
106
107 return ret;
108}
109
110/*
111 * Define the register sets available on OpenRISC under Linux
112 */
113enum or1k_regset {
114 REGSET_GENERAL,
115};
116
117static const struct user_regset or1k_regsets[] = {
118 [REGSET_GENERAL] = {
119 .core_note_type = NT_PRSTATUS,
120 .n = ELF_NGREG,
121 .size = sizeof(long),
122 .align = sizeof(long),
123 .get = genregs_get,
124 .set = genregs_set,
125 },
126};
127
128static const struct user_regset_view user_or1k_native_view = {
129 .name = "or1k",
130 .e_machine = EM_OPENRISC,
131 .regsets = or1k_regsets,
132 .n = ARRAY_SIZE(or1k_regsets),
133};
134
135const struct user_regset_view *task_user_regset_view(struct task_struct *task)
136{
137 return &user_or1k_native_view;
138}
139
140/*
141 * does not yet catch signals sent when the child dies.
142 * in exit.c or in signal.c.
143 */
144
145
146/*
147 * Called by kernel/ptrace.c when detaching..
148 *
149 * Make sure the single step bit is not set.
150 */
151void ptrace_disable(struct task_struct *child)
152{
153 pr_debug("ptrace_disable(): TODO\n");
154
155 user_disable_single_step(child);
156 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
157}
158
159long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
160 unsigned long data)
161{
162 int ret;
163
164 switch (request) {
165 default:
166 ret = ptrace_request(child, request, addr, data);
167 break;
168 }
169
170 return ret;
171}
172
173/*
174 * Notification of system call entry/exit
175 * - triggered by current->work.syscall_trace
176 */
177asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
178{
179 long ret = 0;
180
181 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
182 tracehook_report_syscall_entry(regs))
183 /*
184 * Tracing decided this syscall should not happen.
185 * We'll return a bogus call number to get an ENOSYS
186 * error, but leave the original number in <something>.
187 */
188 ret = -1L;
189
190 audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4],
191 regs->gpr[5], regs->gpr[6]);
192
193 return ret ? : regs->gpr[11];
194}
195
196asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
197{
198 int step;
199
200 audit_syscall_exit(regs);
201
202 step = test_thread_flag(TIF_SINGLESTEP);
203 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
204 tracehook_report_syscall_exit(regs, step);
205}