Commit | Line | Data |
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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 | ||
8 | #define __FRAME_OFFSETS | |
ba9950c8 JD |
9 | #include <asm/ptrace.h> |
10 | #include <linux/sched.h> | |
11 | #include <linux/errno.h> | |
81efcd33 | 12 | #include <linux/mm.h> |
ba9950c8 JD |
13 | #include <asm/uaccess.h> |
14 | #include <asm/elf.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 | ||
22 | int putreg(struct task_struct *child, int regno, unsigned long value) | |
23 | { | |
24 | unsigned long tmp; | |
25 | ||
26 | #ifdef TIF_IA32 | |
27 | /* Some code in the 64bit emulation may not be 64bit clean. | |
28 | Don't take any chances. */ | |
29 | if (test_tsk_thread_flag(child, TIF_IA32)) | |
30 | value &= 0xffffffff; | |
31 | #endif | |
32 | switch (regno){ | |
33 | case FS: | |
34 | case GS: | |
35 | case DS: | |
36 | case ES: | |
37 | case SS: | |
38 | case CS: | |
39 | if (value && (value & 3) != 3) | |
40 | return -EIO; | |
41 | value &= 0xffff; | |
42 | break; | |
43 | ||
44 | case FS_BASE: | |
45 | case GS_BASE: | |
46 | if (!((value >> 48) == 0 || (value >> 48) == 0xffff)) | |
47 | return -EIO; | |
48 | break; | |
49 | ||
50 | case EFLAGS: | |
51 | value &= FLAG_MASK; | |
52 | tmp = PT_REGS_EFLAGS(&child->thread.regs) & ~FLAG_MASK; | |
53 | value |= tmp; | |
54 | break; | |
55 | } | |
56 | ||
57 | PT_REGS_SET(&child->thread.regs, regno, value); | |
58 | return 0; | |
59 | } | |
60 | ||
82c1c11b BS |
61 | int poke_user(struct task_struct *child, long addr, long data) |
62 | { | |
f0c4cad9 JD |
63 | if ((addr & 3) || addr < 0) |
64 | return -EIO; | |
65 | ||
66 | if (addr < MAX_REG_OFFSET) | |
67 | return putreg(child, addr, data); | |
68 | else if ((addr >= offsetof(struct user, u_debugreg[0])) && | |
69 | (addr <= offsetof(struct user, u_debugreg[7]))){ | |
70 | addr -= offsetof(struct user, u_debugreg[0]); | |
71 | addr = addr >> 2; | |
72 | if ((addr == 4) || (addr == 5)) | |
73 | return -EIO; | |
74 | child->thread.arch.debugregs[addr] = data; | |
75 | return 0; | |
76 | } | |
77 | return -EIO; | |
82c1c11b BS |
78 | } |
79 | ||
1da177e4 LT |
80 | unsigned long getreg(struct task_struct *child, int regno) |
81 | { | |
82 | unsigned long retval = ~0UL; | |
83 | switch (regno) { | |
84 | case FS: | |
85 | case GS: | |
86 | case DS: | |
87 | case ES: | |
88 | case SS: | |
89 | case CS: | |
90 | retval = 0xffff; | |
91 | /* fall through */ | |
92 | default: | |
93 | retval &= PT_REG(&child->thread.regs, regno); | |
94 | #ifdef TIF_IA32 | |
95 | if (test_tsk_thread_flag(child, TIF_IA32)) | |
96 | retval &= 0xffffffff; | |
97 | #endif | |
98 | } | |
99 | return retval; | |
100 | } | |
101 | ||
82c1c11b BS |
102 | int peek_user(struct task_struct *child, long addr, long data) |
103 | { | |
104 | /* read the word at location addr in the USER area. */ | |
f0c4cad9 | 105 | unsigned long tmp; |
82c1c11b | 106 | |
f0c4cad9 JD |
107 | if ((addr & 3) || addr < 0) |
108 | return -EIO; | |
109 | ||
110 | tmp = 0; /* Default return condition */ | |
111 | if (addr < MAX_REG_OFFSET){ | |
112 | tmp = getreg(child, addr); | |
113 | } | |
114 | else if ((addr >= offsetof(struct user, u_debugreg[0])) && | |
115 | (addr <= offsetof(struct user, u_debugreg[7]))){ | |
116 | addr -= offsetof(struct user, u_debugreg[0]); | |
117 | addr = addr >> 2; | |
118 | tmp = child->thread.arch.debugregs[addr]; | |
119 | } | |
120 | return put_user(tmp, (unsigned long *) data); | |
1da177e4 LT |
121 | } |
122 | ||
81efcd33 | 123 | /* XXX Mostly copied from sys-i386 */ |
1da177e4 LT |
124 | int is_syscall(unsigned long addr) |
125 | { | |
81efcd33 BS |
126 | unsigned short instr; |
127 | int n; | |
128 | ||
129 | n = copy_from_user(&instr, (void __user *) addr, sizeof(instr)); | |
f0c4cad9 | 130 | if (n){ |
81efcd33 BS |
131 | /* access_process_vm() grants access to vsyscall and stub, |
132 | * while copy_from_user doesn't. Maybe access_process_vm is | |
133 | * slow, but that doesn't matter, since it will be called only | |
134 | * in case of singlestepping, if copy_from_user failed. | |
135 | */ | |
136 | n = access_process_vm(current, addr, &instr, sizeof(instr), 0); | |
f0c4cad9 | 137 | if (n != sizeof(instr)) { |
81efcd33 BS |
138 | printk("is_syscall : failed to read instruction from " |
139 | "0x%lx\n", addr); | |
f0c4cad9 | 140 | return 1; |
81efcd33 BS |
141 | } |
142 | } | |
143 | /* sysenter */ | |
f0c4cad9 | 144 | return instr == 0x050f; |
1da177e4 LT |
145 | } |
146 | ||
e8012b58 | 147 | int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child) |
1da177e4 | 148 | { |
e8012b58 JD |
149 | int err, n, cpu = ((struct thread_info *) child->stack)->cpu; |
150 | long fpregs[HOST_FP_SIZE]; | |
1da177e4 | 151 | |
e8012b58 JD |
152 | BUG_ON(sizeof(*buf) != sizeof(fpregs)); |
153 | err = save_fp_registers(userspace_pid[cpu], fpregs); | |
154 | if (err) | |
155 | return err; | |
156 | ||
157 | n = copy_to_user((void *) buf, fpregs, sizeof(fpregs)); | |
158 | if(n > 0) | |
159 | return -EFAULT; | |
160 | ||
161 | return n; | |
1da177e4 LT |
162 | } |
163 | ||
e8012b58 | 164 | int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child) |
1da177e4 | 165 | { |
e8012b58 JD |
166 | int n, cpu = ((struct thread_info *) child->stack)->cpu; |
167 | long fpregs[HOST_FP_SIZE]; | |
168 | ||
169 | BUG_ON(sizeof(*buf) != sizeof(fpregs)); | |
170 | n = copy_from_user(fpregs, (void *) buf, sizeof(fpregs)); | |
171 | if (n > 0) | |
172 | return -EFAULT; | |
173 | ||
174 | return restore_fp_registers(userspace_pid[cpu], fpregs); | |
1da177e4 LT |
175 | } |
176 | ||
e8012b58 JD |
177 | long subarch_ptrace(struct task_struct *child, long request, long addr, |
178 | long data) | |
1da177e4 | 179 | { |
e8012b58 JD |
180 | int ret = -EIO; |
181 | ||
182 | switch (request) { | |
183 | case PTRACE_GETFPXREGS: /* Get the child FPU state. */ | |
184 | ret = get_fpregs((struct user_i387_struct __user *) data, | |
185 | child); | |
186 | break; | |
187 | case PTRACE_SETFPXREGS: /* Set the child FPU state. */ | |
188 | ret = set_fpregs((struct user_i387_struct __user *) data, | |
189 | child); | |
190 | break; | |
191 | } | |
192 | ||
193 | return ret; | |
1da177e4 | 194 | } |