diff options
Diffstat (limited to 'arch/openrisc/kernel/ptrace.c')
-rw-r--r-- | arch/openrisc/kernel/ptrace.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/arch/openrisc/kernel/ptrace.c b/arch/openrisc/kernel/ptrace.c new file mode 100644 index 00000000000..656b94beab8 --- /dev/null +++ b/arch/openrisc/kernel/ptrace.c | |||
@@ -0,0 +1,211 @@ | |||
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 | } | ||