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e5ad95ce JB |
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 <stddef.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/sched.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 | #include <asm/system.h> | |
37 | ||
38 | /* | |
39 | * Copy the thread state to a regset that can be interpreted by userspace. | |
40 | * | |
41 | * It doesn't matter what our internal pt_regs structure looks like. The | |
42 | * important thing is that we export a consistent view of the thread state | |
43 | * to userspace. As such, we need to make sure that the regset remains | |
44 | * ABI compatible as defined by the struct user_regs_struct: | |
45 | * | |
46 | * (Each item is a 32-bit word) | |
47 | * r0 = 0 (exported for clarity) | |
48 | * 31 GPRS r1-r31 | |
49 | * PC (Program counter) | |
50 | * SR (Supervision register) | |
51 | */ | |
52 | static int genregs_get(struct task_struct *target, | |
53 | const struct user_regset *regset, | |
54 | unsigned int pos, unsigned int count, | |
55 | void *kbuf, void __user * ubuf) | |
56 | { | |
57 | const struct pt_regs *regs = task_pt_regs(target); | |
58 | int ret; | |
59 | ||
60 | /* r0 */ | |
61 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 0, 4); | |
62 | ||
63 | if (!ret) | |
64 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
65 | regs->gpr+1, 4, 4*32); | |
66 | if (!ret) | |
67 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
68 | ®s->pc, 4*32, 4*33); | |
69 | if (!ret) | |
70 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
71 | ®s->sr, 4*33, 4*34); | |
72 | if (!ret) | |
73 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
74 | 4*34, -1); | |
75 | ||
76 | return ret; | |
77 | } | |
78 | ||
79 | /* | |
80 | * Set the thread state from a regset passed in via ptrace | |
81 | */ | |
82 | static int genregs_set(struct task_struct *target, | |
83 | const struct user_regset *regset, | |
84 | unsigned int pos, unsigned int count, | |
85 | const void *kbuf, const void __user * ubuf) | |
86 | { | |
87 | struct pt_regs *regs = task_pt_regs(target); | |
88 | int ret; | |
89 | ||
90 | /* ignore r0 */ | |
91 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4); | |
92 | /* r1 - r31 */ | |
93 | if (!ret) | |
94 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
95 | regs->gpr+1, 4, 4*32); | |
96 | /* PC */ | |
97 | if (!ret) | |
98 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
99 | ®s->pc, 4*32, 4*33); | |
100 | /* | |
101 | * Skip SR and padding... userspace isn't allowed to changes bits in | |
102 | * the Supervision register | |
103 | */ | |
104 | if (!ret) | |
105 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
106 | 4*33, -1); | |
107 | ||
108 | return ret; | |
109 | } | |
110 | ||
111 | /* | |
112 | * Define the register sets available on OpenRISC under Linux | |
113 | */ | |
114 | enum or1k_regset { | |
115 | REGSET_GENERAL, | |
116 | }; | |
117 | ||
118 | static const struct user_regset or1k_regsets[] = { | |
119 | [REGSET_GENERAL] = { | |
120 | .core_note_type = NT_PRSTATUS, | |
121 | .n = ELF_NGREG, | |
122 | .size = sizeof(long), | |
123 | .align = sizeof(long), | |
124 | .get = genregs_get, | |
125 | .set = genregs_set, | |
126 | }, | |
127 | }; | |
128 | ||
129 | static const struct user_regset_view user_or1k_native_view = { | |
130 | .name = "or1k", | |
131 | .e_machine = EM_OPENRISC, | |
132 | .regsets = or1k_regsets, | |
133 | .n = ARRAY_SIZE(or1k_regsets), | |
134 | }; | |
135 | ||
136 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
137 | { | |
138 | return &user_or1k_native_view; | |
139 | } | |
140 | ||
141 | /* | |
142 | * does not yet catch signals sent when the child dies. | |
143 | * in exit.c or in signal.c. | |
144 | */ | |
145 | ||
146 | ||
147 | /* | |
148 | * Called by kernel/ptrace.c when detaching.. | |
149 | * | |
150 | * Make sure the single step bit is not set. | |
151 | */ | |
152 | void ptrace_disable(struct task_struct *child) | |
153 | { | |
154 | pr_debug("ptrace_disable(): TODO\n"); | |
155 | ||
156 | user_disable_single_step(child); | |
157 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
158 | } | |
159 | ||
160 | long arch_ptrace(struct task_struct *child, long request, unsigned long addr, | |
161 | unsigned long data) | |
162 | { | |
163 | int ret; | |
164 | ||
165 | switch (request) { | |
166 | default: | |
167 | ret = ptrace_request(child, request, addr, data); | |
168 | break; | |
169 | } | |
170 | ||
171 | return ret; | |
172 | } | |
173 | ||
174 | /* | |
175 | * Notification of system call entry/exit | |
176 | * - triggered by current->work.syscall_trace | |
177 | */ | |
178 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) | |
179 | { | |
180 | long ret = 0; | |
181 | ||
182 | if (test_thread_flag(TIF_SYSCALL_TRACE) && | |
183 | tracehook_report_syscall_entry(regs)) | |
184 | /* | |
185 | * Tracing decided this syscall should not happen. | |
186 | * We'll return a bogus call number to get an ENOSYS | |
187 | * error, but leave the original number in <something>. | |
188 | */ | |
189 | ret = -1L; | |
190 | ||
191 | /* Are these regs right??? */ | |
192 | if (unlikely(current->audit_context)) | |
193 | audit_syscall_entry(audit_arch(), regs->syscallno, | |
194 | regs->gpr[3], regs->gpr[4], | |
195 | regs->gpr[5], regs->gpr[6]); | |
196 | ||
197 | return ret ? : regs->syscallno; | |
198 | } | |
199 | ||
200 | asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) | |
201 | { | |
202 | int step; | |
203 | ||
204 | if (unlikely(current->audit_context)) | |
205 | audit_syscall_exit(AUDITSC_RESULT(regs->gpr[11]), | |
206 | regs->gpr[11]); | |
207 | ||
208 | step = test_thread_flag(TIF_SINGLESTEP); | |
209 | if (step || test_thread_flag(TIF_SYSCALL_TRACE)) | |
210 | tracehook_report_syscall_exit(regs, step); | |
211 | } |