Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright 2003 PathScale, Inc. | |
f0c4cad9 | 3 | * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
4 | * |
5 | * Licensed under the GPL | |
6 | */ | |
7 | ||
95906b24 | 8 | #include <linux/mm.h> |
ba9950c8 JD |
9 | #include <linux/sched.h> |
10 | #include <linux/errno.h> | |
95906b24 JD |
11 | #define __FRAME_OFFSETS |
12 | #include <asm/ptrace.h> | |
ba9950c8 | 13 | #include <asm/uaccess.h> |
da028d5e | 14 | #include <asm/ptrace-abi.h> |
1da177e4 | 15 | |
f0c4cad9 JD |
16 | /* |
17 | * determines which flags the user has access to. | |
18 | * 1 = access 0 = no access | |
19 | */ | |
1da177e4 LT |
20 | #define FLAG_MASK 0x44dd5UL |
21 | ||
412f90ed | 22 | static const int reg_offsets[] = |
1da177e4 | 23 | { |
412f90ed AV |
24 | [R8 >> 3] = HOST_R8, |
25 | [R9 >> 3] = HOST_R9, | |
26 | [R10 >> 3] = HOST_R10, | |
27 | [R11 >> 3] = HOST_R11, | |
28 | [R12 >> 3] = HOST_R12, | |
29 | [R13 >> 3] = HOST_R13, | |
30 | [R14 >> 3] = HOST_R14, | |
31 | [R15 >> 3] = HOST_R15, | |
32 | [RIP >> 3] = HOST_IP, | |
33 | [RSP >> 3] = HOST_SP, | |
3579a389 AV |
34 | [RAX >> 3] = HOST_AX, |
35 | [RBX >> 3] = HOST_BX, | |
36 | [RCX >> 3] = HOST_CX, | |
37 | [RDX >> 3] = HOST_DX, | |
38 | [RSI >> 3] = HOST_SI, | |
39 | [RDI >> 3] = HOST_DI, | |
40 | [RBP >> 3] = HOST_BP, | |
412f90ed AV |
41 | [CS >> 3] = HOST_CS, |
42 | [SS >> 3] = HOST_SS, | |
43 | [FS_BASE >> 3] = HOST_FS_BASE, | |
44 | [GS_BASE >> 3] = HOST_GS_BASE, | |
45 | [DS >> 3] = HOST_DS, | |
46 | [ES >> 3] = HOST_ES, | |
47 | [FS >> 3] = HOST_FS, | |
48 | [GS >> 3] = HOST_GS, | |
49 | [EFLAGS >> 3] = HOST_EFLAGS, | |
966e803a | 50 | [ORIG_RAX >> 3] = HOST_ORIG_AX, |
412f90ed | 51 | }; |
1da177e4 | 52 | |
412f90ed AV |
53 | int putreg(struct task_struct *child, int regno, unsigned long value) |
54 | { | |
1da177e4 | 55 | #ifdef TIF_IA32 |
95906b24 JD |
56 | /* |
57 | * Some code in the 64bit emulation may not be 64bit clean. | |
58 | * Don't take any chances. | |
59 | */ | |
1da177e4 LT |
60 | if (test_tsk_thread_flag(child, TIF_IA32)) |
61 | value &= 0xffffffff; | |
62 | #endif | |
95906b24 | 63 | switch (regno) { |
412f90ed AV |
64 | case R8: |
65 | case R9: | |
66 | case R10: | |
67 | case R11: | |
68 | case R12: | |
69 | case R13: | |
70 | case R14: | |
71 | case R15: | |
72 | case RIP: | |
73 | case RSP: | |
74 | case RAX: | |
75 | case RBX: | |
76 | case RCX: | |
77 | case RDX: | |
78 | case RSI: | |
79 | case RDI: | |
80 | case RBP: | |
81 | case ORIG_RAX: | |
82 | break; | |
83 | ||
1da177e4 LT |
84 | case FS: |
85 | case GS: | |
86 | case DS: | |
87 | case ES: | |
88 | case SS: | |
89 | case CS: | |
90 | if (value && (value & 3) != 3) | |
91 | return -EIO; | |
92 | value &= 0xffff; | |
93 | break; | |
94 | ||
95 | case FS_BASE: | |
96 | case GS_BASE: | |
97 | if (!((value >> 48) == 0 || (value >> 48) == 0xffff)) | |
98 | return -EIO; | |
99 | break; | |
100 | ||
101 | case EFLAGS: | |
102 | value &= FLAG_MASK; | |
412f90ed AV |
103 | child->thread.regs.regs.gp[HOST_EFLAGS] |= value; |
104 | return 0; | |
105 | ||
106 | default: | |
107 | panic("Bad register in putreg(): %d\n", regno); | |
1da177e4 LT |
108 | } |
109 | ||
412f90ed | 110 | child->thread.regs.regs.gp[reg_offsets[regno >> 3]] = value; |
1da177e4 LT |
111 | return 0; |
112 | } | |
113 | ||
82c1c11b BS |
114 | int poke_user(struct task_struct *child, long addr, long data) |
115 | { | |
f0c4cad9 JD |
116 | if ((addr & 3) || addr < 0) |
117 | return -EIO; | |
118 | ||
119 | if (addr < MAX_REG_OFFSET) | |
120 | return putreg(child, addr, data); | |
121 | else if ((addr >= offsetof(struct user, u_debugreg[0])) && | |
95906b24 | 122 | (addr <= offsetof(struct user, u_debugreg[7]))) { |
f0c4cad9 JD |
123 | addr -= offsetof(struct user, u_debugreg[0]); |
124 | addr = addr >> 2; | |
125 | if ((addr == 4) || (addr == 5)) | |
126 | return -EIO; | |
127 | child->thread.arch.debugregs[addr] = data; | |
128 | return 0; | |
129 | } | |
130 | return -EIO; | |
82c1c11b BS |
131 | } |
132 | ||
1da177e4 LT |
133 | unsigned long getreg(struct task_struct *child, int regno) |
134 | { | |
412f90ed AV |
135 | unsigned long mask = ~0UL; |
136 | #ifdef TIF_IA32 | |
137 | if (test_tsk_thread_flag(child, TIF_IA32)) | |
138 | mask = 0xffffffff; | |
139 | #endif | |
1da177e4 | 140 | switch (regno) { |
412f90ed AV |
141 | case R8: |
142 | case R9: | |
143 | case R10: | |
144 | case R11: | |
145 | case R12: | |
146 | case R13: | |
147 | case R14: | |
148 | case R15: | |
149 | case RIP: | |
150 | case RSP: | |
151 | case RAX: | |
152 | case RBX: | |
153 | case RCX: | |
154 | case RDX: | |
155 | case RSI: | |
156 | case RDI: | |
157 | case RBP: | |
158 | case ORIG_RAX: | |
159 | case EFLAGS: | |
160 | case FS_BASE: | |
161 | case GS_BASE: | |
162 | break; | |
1da177e4 LT |
163 | case FS: |
164 | case GS: | |
165 | case DS: | |
166 | case ES: | |
167 | case SS: | |
168 | case CS: | |
412f90ed AV |
169 | mask = 0xffff; |
170 | break; | |
1da177e4 | 171 | default: |
412f90ed | 172 | panic("Bad register in getreg: %d\n", regno); |
1da177e4 | 173 | } |
412f90ed | 174 | return mask & child->thread.regs.regs.gp[reg_offsets[regno >> 3]]; |
1da177e4 LT |
175 | } |
176 | ||
82c1c11b BS |
177 | int peek_user(struct task_struct *child, long addr, long data) |
178 | { | |
179 | /* read the word at location addr in the USER area. */ | |
f0c4cad9 | 180 | unsigned long tmp; |
82c1c11b | 181 | |
f0c4cad9 JD |
182 | if ((addr & 3) || addr < 0) |
183 | return -EIO; | |
184 | ||
185 | tmp = 0; /* Default return condition */ | |
95906b24 | 186 | if (addr < MAX_REG_OFFSET) |
f0c4cad9 | 187 | tmp = getreg(child, addr); |
f0c4cad9 | 188 | else if ((addr >= offsetof(struct user, u_debugreg[0])) && |
95906b24 | 189 | (addr <= offsetof(struct user, u_debugreg[7]))) { |
f0c4cad9 JD |
190 | addr -= offsetof(struct user, u_debugreg[0]); |
191 | addr = addr >> 2; | |
192 | tmp = child->thread.arch.debugregs[addr]; | |
193 | } | |
194 | return put_user(tmp, (unsigned long *) data); | |
1da177e4 LT |
195 | } |
196 | ||
81efcd33 | 197 | /* XXX Mostly copied from sys-i386 */ |
1da177e4 LT |
198 | int is_syscall(unsigned long addr) |
199 | { | |
81efcd33 BS |
200 | unsigned short instr; |
201 | int n; | |
202 | ||
203 | n = copy_from_user(&instr, (void __user *) addr, sizeof(instr)); | |
95906b24 JD |
204 | if (n) { |
205 | /* | |
206 | * access_process_vm() grants access to vsyscall and stub, | |
81efcd33 BS |
207 | * while copy_from_user doesn't. Maybe access_process_vm is |
208 | * slow, but that doesn't matter, since it will be called only | |
209 | * in case of singlestepping, if copy_from_user failed. | |
210 | */ | |
211 | n = access_process_vm(current, addr, &instr, sizeof(instr), 0); | |
f0c4cad9 | 212 | if (n != sizeof(instr)) { |
81efcd33 BS |
213 | printk("is_syscall : failed to read instruction from " |
214 | "0x%lx\n", addr); | |
f0c4cad9 | 215 | return 1; |
81efcd33 BS |
216 | } |
217 | } | |
218 | /* sysenter */ | |
f0c4cad9 | 219 | return instr == 0x050f; |
1da177e4 LT |
220 | } |
221 | ||
f2833aef | 222 | static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child) |
1da177e4 | 223 | { |
e8012b58 JD |
224 | int err, n, cpu = ((struct thread_info *) child->stack)->cpu; |
225 | long fpregs[HOST_FP_SIZE]; | |
1da177e4 | 226 | |
e8012b58 JD |
227 | BUG_ON(sizeof(*buf) != sizeof(fpregs)); |
228 | err = save_fp_registers(userspace_pid[cpu], fpregs); | |
229 | if (err) | |
230 | return err; | |
231 | ||
b4a08a10 | 232 | n = copy_to_user(buf, fpregs, sizeof(fpregs)); |
95906b24 | 233 | if (n > 0) |
e8012b58 JD |
234 | return -EFAULT; |
235 | ||
236 | return n; | |
1da177e4 LT |
237 | } |
238 | ||
f2833aef | 239 | static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child) |
1da177e4 | 240 | { |
e8012b58 JD |
241 | int n, cpu = ((struct thread_info *) child->stack)->cpu; |
242 | long fpregs[HOST_FP_SIZE]; | |
243 | ||
244 | BUG_ON(sizeof(*buf) != sizeof(fpregs)); | |
b4a08a10 | 245 | n = copy_from_user(fpregs, buf, sizeof(fpregs)); |
e8012b58 JD |
246 | if (n > 0) |
247 | return -EFAULT; | |
248 | ||
249 | return restore_fp_registers(userspace_pid[cpu], fpregs); | |
1da177e4 LT |
250 | } |
251 | ||
9b05a69e NK |
252 | long subarch_ptrace(struct task_struct *child, long request, |
253 | unsigned long addr, unsigned long data) | |
1da177e4 | 254 | { |
f2833aef AV |
255 | int ret = -EIO; |
256 | void __user *datap = (void __user *) data; | |
257 | ||
258 | switch (request) { | |
259 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
260 | ret = get_fpregs(datap, child); | |
261 | break; | |
262 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
263 | ret = set_fpregs(datap, child); | |
264 | break; | |
265 | case PTRACE_ARCH_PRCTL: | |
266 | /* XXX Calls ptrace on the host - needs some SMP thinking */ | |
267 | ret = arch_prctl(child, data, (void __user *) addr); | |
268 | break; | |
269 | } | |
270 | ||
271 | return ret; | |
1da177e4 | 272 | } |