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 | ||
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> |
1da177e4 | 14 | |
f0c4cad9 JD |
15 | /* |
16 | * determines which flags the user has access to. | |
17 | * 1 = access 0 = no access | |
18 | */ | |
1da177e4 LT |
19 | #define FLAG_MASK 0x44dd5UL |
20 | ||
21 | int putreg(struct task_struct *child, int regno, unsigned long value) | |
22 | { | |
23 | unsigned long tmp; | |
24 | ||
25 | #ifdef TIF_IA32 | |
95906b24 JD |
26 | /* |
27 | * Some code in the 64bit emulation may not be 64bit clean. | |
28 | * Don't take any chances. | |
29 | */ | |
1da177e4 LT |
30 | if (test_tsk_thread_flag(child, TIF_IA32)) |
31 | value &= 0xffffffff; | |
32 | #endif | |
95906b24 | 33 | switch (regno) { |
1da177e4 LT |
34 | case FS: |
35 | case GS: | |
36 | case DS: | |
37 | case ES: | |
38 | case SS: | |
39 | case CS: | |
40 | if (value && (value & 3) != 3) | |
41 | return -EIO; | |
42 | value &= 0xffff; | |
43 | break; | |
44 | ||
45 | case FS_BASE: | |
46 | case GS_BASE: | |
47 | if (!((value >> 48) == 0 || (value >> 48) == 0xffff)) | |
48 | return -EIO; | |
49 | break; | |
50 | ||
51 | case EFLAGS: | |
52 | value &= FLAG_MASK; | |
53 | tmp = PT_REGS_EFLAGS(&child->thread.regs) & ~FLAG_MASK; | |
54 | value |= tmp; | |
55 | break; | |
56 | } | |
57 | ||
58 | PT_REGS_SET(&child->thread.regs, regno, value); | |
59 | return 0; | |
60 | } | |
61 | ||
82c1c11b BS |
62 | int poke_user(struct task_struct *child, long addr, long data) |
63 | { | |
f0c4cad9 JD |
64 | if ((addr & 3) || addr < 0) |
65 | return -EIO; | |
66 | ||
67 | if (addr < MAX_REG_OFFSET) | |
68 | return putreg(child, addr, data); | |
69 | else if ((addr >= offsetof(struct user, u_debugreg[0])) && | |
95906b24 | 70 | (addr <= offsetof(struct user, u_debugreg[7]))) { |
f0c4cad9 JD |
71 | addr -= offsetof(struct user, u_debugreg[0]); |
72 | addr = addr >> 2; | |
73 | if ((addr == 4) || (addr == 5)) | |
74 | return -EIO; | |
75 | child->thread.arch.debugregs[addr] = data; | |
76 | return 0; | |
77 | } | |
78 | return -EIO; | |
82c1c11b BS |
79 | } |
80 | ||
1da177e4 LT |
81 | unsigned long getreg(struct task_struct *child, int regno) |
82 | { | |
83 | unsigned long retval = ~0UL; | |
84 | switch (regno) { | |
85 | case FS: | |
86 | case GS: | |
87 | case DS: | |
88 | case ES: | |
89 | case SS: | |
90 | case CS: | |
91 | retval = 0xffff; | |
92 | /* fall through */ | |
93 | default: | |
94 | retval &= PT_REG(&child->thread.regs, regno); | |
95 | #ifdef TIF_IA32 | |
96 | if (test_tsk_thread_flag(child, TIF_IA32)) | |
97 | retval &= 0xffffffff; | |
98 | #endif | |
99 | } | |
100 | return retval; | |
101 | } | |
102 | ||
82c1c11b BS |
103 | int peek_user(struct task_struct *child, long addr, long data) |
104 | { | |
105 | /* read the word at location addr in the USER area. */ | |
f0c4cad9 | 106 | unsigned long tmp; |
82c1c11b | 107 | |
f0c4cad9 JD |
108 | if ((addr & 3) || addr < 0) |
109 | return -EIO; | |
110 | ||
111 | tmp = 0; /* Default return condition */ | |
95906b24 | 112 | if (addr < MAX_REG_OFFSET) |
f0c4cad9 | 113 | tmp = getreg(child, addr); |
f0c4cad9 | 114 | else if ((addr >= offsetof(struct user, u_debugreg[0])) && |
95906b24 | 115 | (addr <= offsetof(struct user, u_debugreg[7]))) { |
f0c4cad9 JD |
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)); | |
95906b24 JD |
130 | if (n) { |
131 | /* | |
132 | * access_process_vm() grants access to vsyscall and stub, | |
81efcd33 BS |
133 | * while copy_from_user doesn't. Maybe access_process_vm is |
134 | * slow, but that doesn't matter, since it will be called only | |
135 | * in case of singlestepping, if copy_from_user failed. | |
136 | */ | |
137 | n = access_process_vm(current, addr, &instr, sizeof(instr), 0); | |
f0c4cad9 | 138 | if (n != sizeof(instr)) { |
81efcd33 BS |
139 | printk("is_syscall : failed to read instruction from " |
140 | "0x%lx\n", addr); | |
f0c4cad9 | 141 | return 1; |
81efcd33 BS |
142 | } |
143 | } | |
144 | /* sysenter */ | |
f0c4cad9 | 145 | return instr == 0x050f; |
1da177e4 LT |
146 | } |
147 | ||
e8012b58 | 148 | int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child) |
1da177e4 | 149 | { |
e8012b58 JD |
150 | int err, n, cpu = ((struct thread_info *) child->stack)->cpu; |
151 | long fpregs[HOST_FP_SIZE]; | |
1da177e4 | 152 | |
e8012b58 JD |
153 | BUG_ON(sizeof(*buf) != sizeof(fpregs)); |
154 | err = save_fp_registers(userspace_pid[cpu], fpregs); | |
155 | if (err) | |
156 | return err; | |
157 | ||
b4a08a10 | 158 | n = copy_to_user(buf, fpregs, sizeof(fpregs)); |
95906b24 | 159 | if (n > 0) |
e8012b58 JD |
160 | return -EFAULT; |
161 | ||
162 | return n; | |
1da177e4 LT |
163 | } |
164 | ||
e8012b58 | 165 | int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child) |
1da177e4 | 166 | { |
e8012b58 JD |
167 | int n, cpu = ((struct thread_info *) child->stack)->cpu; |
168 | long fpregs[HOST_FP_SIZE]; | |
169 | ||
170 | BUG_ON(sizeof(*buf) != sizeof(fpregs)); | |
b4a08a10 | 171 | n = copy_from_user(fpregs, buf, sizeof(fpregs)); |
e8012b58 JD |
172 | if (n > 0) |
173 | return -EFAULT; | |
174 | ||
175 | return restore_fp_registers(userspace_pid[cpu], fpregs); | |
1da177e4 LT |
176 | } |
177 | ||
9b05a69e NK |
178 | long subarch_ptrace(struct task_struct *child, long request, |
179 | unsigned long addr, unsigned long data) | |
1da177e4 | 180 | { |
e8012b58 JD |
181 | int ret = -EIO; |
182 | ||
183 | switch (request) { | |
184 | case PTRACE_GETFPXREGS: /* Get the child FPU state. */ | |
185 | ret = get_fpregs((struct user_i387_struct __user *) data, | |
186 | child); | |
187 | break; | |
188 | case PTRACE_SETFPXREGS: /* Set the child FPU state. */ | |
189 | ret = set_fpregs((struct user_i387_struct __user *) data, | |
190 | child); | |
191 | break; | |
192 | } | |
193 | ||
194 | return ret; | |
1da177e4 | 195 | } |