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1 | /* |
2 | * linux/arch/m68knommu/kernel/ptrace.c |
3 | * |
4 | * Copyright (C) 1994 by Hamish Macdonald |
5 | * Taken from linux/kernel/ptrace.c and modified for M680x0. |
6 | * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds |
7 | * |
8 | * This file is subject to the terms and conditions of the GNU General |
9 | * Public License. See the file COPYING in the main directory of |
10 | * this archive for more details. |
11 | */ |
12 | |
13 | #include <linux/kernel.h> |
14 | #include <linux/sched.h> |
15 | #include <linux/mm.h> |
16 | #include <linux/smp.h> |
17 | #include <linux/errno.h> |
18 | #include <linux/ptrace.h> |
19 | #include <linux/user.h> |
20 | #include <linux/signal.h> |
21 | #include <linux/tracehook.h> |
22 | |
23 | #include <asm/uaccess.h> |
24 | #include <asm/page.h> |
25 | #include <asm/pgtable.h> |
26 | #include <asm/system.h> |
27 | #include <asm/processor.h> |
28 | |
29 | /* |
30 | * does not yet catch signals sent when the child dies. |
31 | * in exit.c or in signal.c. |
32 | */ |
33 | |
34 | /* determines which bits in the SR the user has access to. */ |
35 | /* 1 = access 0 = no access */ |
36 | #define SR_MASK 0x001f |
37 | |
38 | /* sets the trace bits. */ |
39 | #define TRACE_BITS 0x8000 |
40 | |
41 | /* Find the stack offset for a register, relative to thread.esp0. */ |
42 | #define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg) |
43 | #define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \ |
44 | - sizeof(struct switch_stack)) |
45 | /* Mapping from PT_xxx to the stack offset at which the register is |
46 | saved. Notice that usp has no stack-slot and needs to be treated |
47 | specially (see get_reg/put_reg below). */ |
48 | static int regoff[] = { |
49 | PT_REG(d1), PT_REG(d2), PT_REG(d3), PT_REG(d4), |
50 | PT_REG(d5), SW_REG(d6), SW_REG(d7), PT_REG(a0), |
51 | PT_REG(a1), PT_REG(a2), SW_REG(a3), SW_REG(a4), |
52 | SW_REG(a5), SW_REG(a6), PT_REG(d0), -1, |
53 | PT_REG(orig_d0), PT_REG(sr), PT_REG(pc), |
54 | }; |
55 | |
56 | /* |
57 | * Get contents of register REGNO in task TASK. |
58 | */ |
59 | static inline long get_reg(struct task_struct *task, int regno) |
60 | { |
61 | unsigned long *addr; |
62 | |
63 | if (regno == PT_USP) |
64 | addr = &task->thread.usp; |
65 | else if (regno < ARRAY_SIZE(regoff)) |
66 | addr = (unsigned long *)(task->thread.esp0 + regoff[regno]); |
67 | else |
68 | return 0; |
69 | return *addr; |
70 | } |
71 | |
72 | /* |
73 | * Write contents of register REGNO in task TASK. |
74 | */ |
75 | static inline int put_reg(struct task_struct *task, int regno, |
76 | unsigned long data) |
77 | { |
78 | unsigned long *addr; |
79 | |
80 | if (regno == PT_USP) |
81 | addr = &task->thread.usp; |
82 | else if (regno < ARRAY_SIZE(regoff)) |
83 | addr = (unsigned long *) (task->thread.esp0 + regoff[regno]); |
84 | else |
85 | return -1; |
86 | *addr = data; |
87 | return 0; |
88 | } |
89 | |
90 | void user_enable_single_step(struct task_struct *task) |
91 | { |
92 | unsigned long srflags; |
93 | srflags = get_reg(task, PT_SR) | (TRACE_BITS << 16); |
94 | put_reg(task, PT_SR, srflags); |
95 | } |
96 | |
97 | void user_disable_single_step(struct task_struct *task) |
98 | { |
99 | unsigned long srflags; |
100 | srflags = get_reg(task, PT_SR) & ~(TRACE_BITS << 16); |
101 | put_reg(task, PT_SR, srflags); |
102 | } |
103 | |
104 | /* |
105 | * Called by kernel/ptrace.c when detaching.. |
106 | * |
107 | * Make sure the single step bit is not set. |
108 | */ |
109 | void ptrace_disable(struct task_struct *child) |
110 | { |
111 | /* make sure the single step bit is not set. */ |
112 | user_disable_single_step(child); |
113 | } |
114 | |
115 | long arch_ptrace(struct task_struct *child, long request, |
116 | unsigned long addr, unsigned long data) |
117 | { |
118 | int ret; |
119 | int regno = addr >> 2; |
120 | unsigned long __user *datap = (unsigned long __user *) data; |
121 | |
122 | switch (request) { |
123 | /* read the word at location addr in the USER area. */ |
124 | case PTRACE_PEEKUSR: { |
125 | unsigned long tmp; |
126 | |
127 | ret = -EIO; |
128 | if ((addr & 3) || addr > sizeof(struct user) - 3) |
129 | break; |
130 | |
131 | tmp = 0; /* Default return condition */ |
132 | ret = -EIO; |
133 | if (regno < 19) { |
134 | tmp = get_reg(child, regno); |
135 | if (regno == PT_SR) |
136 | tmp >>= 16; |
137 | } else if (regno >= 21 && regno < 49) { |
138 | tmp = child->thread.fp[regno - 21]; |
139 | } else if (regno == 49) { |
140 | tmp = child->mm->start_code; |
141 | } else if (regno == 50) { |
142 | tmp = child->mm->start_data; |
143 | } else if (regno == 51) { |
144 | tmp = child->mm->end_code; |
145 | } else |
146 | break; |
147 | ret = put_user(tmp, datap); |
148 | break; |
149 | } |
150 | |
151 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
152 | ret = -EIO; |
153 | if ((addr & 3) || addr > sizeof(struct user) - 3) |
154 | break; |
155 | |
156 | if (regno == PT_SR) { |
157 | data &= SR_MASK; |
158 | data <<= 16; |
159 | data |= get_reg(child, PT_SR) & ~(SR_MASK << 16); |
160 | } |
161 | if (regno < 19) { |
162 | if (put_reg(child, regno, data)) |
163 | break; |
164 | ret = 0; |
165 | break; |
166 | } |
167 | if (regno >= 21 && regno < 48) |
168 | { |
169 | child->thread.fp[regno - 21] = data; |
170 | ret = 0; |
171 | } |
172 | break; |
173 | |
174 | case PTRACE_GETREGS: { /* Get all gp regs from the child. */ |
175 | int i; |
176 | unsigned long tmp; |
177 | for (i = 0; i < 19; i++) { |
178 | tmp = get_reg(child, i); |
179 | if (i == PT_SR) |
180 | tmp >>= 16; |
181 | if (put_user(tmp, datap)) { |
182 | ret = -EFAULT; |
183 | break; |
184 | } |
185 | datap++; |
186 | } |
187 | ret = 0; |
188 | break; |
189 | } |
190 | |
191 | case PTRACE_SETREGS: { /* Set all gp regs in the child. */ |
192 | int i; |
193 | unsigned long tmp; |
194 | for (i = 0; i < 19; i++) { |
195 | if (get_user(tmp, datap)) { |
196 | ret = -EFAULT; |
197 | break; |
198 | } |
199 | if (i == PT_SR) { |
200 | tmp &= SR_MASK; |
201 | tmp <<= 16; |
202 | tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16); |
203 | } |
204 | put_reg(child, i, tmp); |
205 | datap++; |
206 | } |
207 | ret = 0; |
208 | break; |
209 | } |
210 | |
211 | #ifdef PTRACE_GETFPREGS |
212 | case PTRACE_GETFPREGS: { /* Get the child FPU state. */ |
213 | ret = 0; |
214 | if (copy_to_user(datap, &child->thread.fp, |
215 | sizeof(struct user_m68kfp_struct))) |
216 | ret = -EFAULT; |
217 | break; |
218 | } |
219 | #endif |
220 | |
221 | #ifdef PTRACE_SETFPREGS |
222 | case PTRACE_SETFPREGS: { /* Set the child FPU state. */ |
223 | ret = 0; |
224 | if (copy_from_user(&child->thread.fp, datap, |
225 | sizeof(struct user_m68kfp_struct))) |
226 | ret = -EFAULT; |
227 | break; |
228 | } |
229 | #endif |
230 | |
231 | case PTRACE_GET_THREAD_AREA: |
232 | ret = put_user(task_thread_info(child)->tp_value, datap); |
233 | break; |
234 | |
235 | default: |
236 | ret = ptrace_request(child, request, addr, data); |
237 | break; |
238 | } |
239 | return ret; |
240 | } |
241 | |
242 | asmlinkage int syscall_trace_enter(void) |
243 | { |
244 | int ret = 0; |
245 | |
246 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
247 | ret = tracehook_report_syscall_entry(task_pt_regs(current)); |
248 | return ret; |
249 | } |
250 | |
251 | asmlinkage void syscall_trace_leave(void) |
252 | { |
253 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
254 | tracehook_report_syscall_exit(task_pt_regs(current), 0); |
255 | } |
256 |
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