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