Commit | Line | Data |
---|---|---|
ba180fd4 JD |
1 | /* |
2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) | |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
81efcd33 | 6 | #include "linux/mm.h" |
ba180fd4 | 7 | #include "linux/sched.h" |
1da177e4 | 8 | #include "asm/uaccess.h" |
e8012b58 | 9 | #include "skas.h" |
1da177e4 | 10 | |
291248fd | 11 | extern int arch_switch_tls(struct task_struct *to); |
77bf4400 | 12 | |
291248fd | 13 | void arch_switch_to(struct task_struct *to) |
1da177e4 | 14 | { |
291248fd | 15 | int err = arch_switch_tls(to); |
54d8d3b5 PBG |
16 | if (!err) |
17 | return; | |
18 | ||
19 | if (err != -EINVAL) | |
ba180fd4 JD |
20 | printk(KERN_WARNING "arch_switch_tls failed, errno %d, " |
21 | "not EINVAL\n", -err); | |
54d8d3b5 | 22 | else |
77bf4400 | 23 | printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n"); |
1da177e4 LT |
24 | } |
25 | ||
26 | int is_syscall(unsigned long addr) | |
27 | { | |
28 | unsigned short instr; | |
29 | int n; | |
30 | ||
31 | n = copy_from_user(&instr, (void __user *) addr, sizeof(instr)); | |
ba180fd4 | 32 | if (n) { |
81efcd33 BS |
33 | /* access_process_vm() grants access to vsyscall and stub, |
34 | * while copy_from_user doesn't. Maybe access_process_vm is | |
35 | * slow, but that doesn't matter, since it will be called only | |
36 | * in case of singlestepping, if copy_from_user failed. | |
37 | */ | |
38 | n = access_process_vm(current, addr, &instr, sizeof(instr), 0); | |
ba180fd4 JD |
39 | if (n != sizeof(instr)) { |
40 | printk(KERN_ERR "is_syscall : failed to read " | |
41 | "instruction from 0x%lx\n", addr); | |
42 | return 1; | |
81efcd33 | 43 | } |
1da177e4 LT |
44 | } |
45 | /* int 0x80 or sysenter */ | |
ba180fd4 | 46 | return (instr == 0x80cd) || (instr == 0x340f); |
1da177e4 LT |
47 | } |
48 | ||
49 | /* determines which flags the user has access to. */ | |
50 | /* 1 = access 0 = no access */ | |
51 | #define FLAG_MASK 0x00044dd5 | |
52 | ||
53 | int putreg(struct task_struct *child, int regno, unsigned long value) | |
54 | { | |
55 | regno >>= 2; | |
56 | switch (regno) { | |
57 | case FS: | |
58 | if (value && (value & 3) != 3) | |
59 | return -EIO; | |
60 | PT_REGS_FS(&child->thread.regs) = value; | |
61 | return 0; | |
62 | case GS: | |
63 | if (value && (value & 3) != 3) | |
64 | return -EIO; | |
65 | PT_REGS_GS(&child->thread.regs) = value; | |
66 | return 0; | |
67 | case DS: | |
68 | case ES: | |
69 | if (value && (value & 3) != 3) | |
70 | return -EIO; | |
71 | value &= 0xffff; | |
72 | break; | |
73 | case SS: | |
74 | case CS: | |
75 | if ((value & 3) != 3) | |
76 | return -EIO; | |
77 | value &= 0xffff; | |
78 | break; | |
79 | case EFL: | |
80 | value &= FLAG_MASK; | |
81 | value |= PT_REGS_EFLAGS(&child->thread.regs); | |
82 | break; | |
83 | } | |
84 | PT_REGS_SET(&child->thread.regs, regno, value); | |
85 | return 0; | |
86 | } | |
87 | ||
82c1c11b BS |
88 | int poke_user(struct task_struct *child, long addr, long data) |
89 | { | |
ba180fd4 JD |
90 | if ((addr & 3) || addr < 0) |
91 | return -EIO; | |
92 | ||
93 | if (addr < MAX_REG_OFFSET) | |
94 | return putreg(child, addr, data); | |
95 | else if ((addr >= offsetof(struct user, u_debugreg[0])) && | |
96 | (addr <= offsetof(struct user, u_debugreg[7]))) { | |
97 | addr -= offsetof(struct user, u_debugreg[0]); | |
98 | addr = addr >> 2; | |
99 | if ((addr == 4) || (addr == 5)) | |
100 | return -EIO; | |
101 | child->thread.arch.debugregs[addr] = data; | |
102 | return 0; | |
103 | } | |
104 | return -EIO; | |
82c1c11b BS |
105 | } |
106 | ||
1da177e4 LT |
107 | unsigned long getreg(struct task_struct *child, int regno) |
108 | { | |
109 | unsigned long retval = ~0UL; | |
110 | ||
111 | regno >>= 2; | |
112 | switch (regno) { | |
113 | case FS: | |
114 | case GS: | |
115 | case DS: | |
116 | case ES: | |
117 | case SS: | |
118 | case CS: | |
119 | retval = 0xffff; | |
120 | /* fall through */ | |
121 | default: | |
122 | retval &= PT_REG(&child->thread.regs, regno); | |
123 | } | |
124 | return retval; | |
125 | } | |
126 | ||
ba180fd4 | 127 | /* read the word at location addr in the USER area. */ |
82c1c11b BS |
128 | int peek_user(struct task_struct *child, long addr, long data) |
129 | { | |
4d338e1a | 130 | unsigned long tmp; |
82c1c11b | 131 | |
4d338e1a AV |
132 | if ((addr & 3) || addr < 0) |
133 | return -EIO; | |
82c1c11b | 134 | |
4d338e1a | 135 | tmp = 0; /* Default return condition */ |
ba180fd4 | 136 | if (addr < MAX_REG_OFFSET) { |
4d338e1a AV |
137 | tmp = getreg(child, addr); |
138 | } | |
ba180fd4 JD |
139 | else if ((addr >= offsetof(struct user, u_debugreg[0])) && |
140 | (addr <= offsetof(struct user, u_debugreg[7]))) { | |
4d338e1a AV |
141 | addr -= offsetof(struct user, u_debugreg[0]); |
142 | addr = addr >> 2; | |
143 | tmp = child->thread.arch.debugregs[addr]; | |
144 | } | |
145 | return put_user(tmp, (unsigned long __user *) data); | |
82c1c11b BS |
146 | } |
147 | ||
e8012b58 | 148 | int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child) |
1da177e4 | 149 | { |
e8012b58 | 150 | int err, n, cpu = ((struct thread_info *) child->stack)->cpu; |
47906dd9 | 151 | struct user_i387_struct fpregs; |
1da177e4 | 152 | |
47906dd9 | 153 | err = save_fp_registers(userspace_pid[cpu], (unsigned long *) &fpregs); |
e8012b58 JD |
154 | if (err) |
155 | return err; | |
156 | ||
47906dd9 | 157 | n = copy_to_user(buf, &fpregs, sizeof(fpregs)); |
e8012b58 JD |
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 | 166 | int n, cpu = ((struct thread_info *) child->stack)->cpu; |
47906dd9 | 167 | struct user_i387_struct fpregs; |
1da177e4 | 168 | |
47906dd9 | 169 | n = copy_from_user(&fpregs, buf, sizeof(fpregs)); |
e8012b58 | 170 | if (n > 0) |
ba180fd4 | 171 | return -EFAULT; |
e8012b58 | 172 | |
47906dd9 JD |
173 | return restore_fp_registers(userspace_pid[cpu], |
174 | (unsigned long *) &fpregs); | |
1da177e4 LT |
175 | } |
176 | ||
e8012b58 | 177 | int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child) |
1da177e4 | 178 | { |
e8012b58 | 179 | int err, n, cpu = ((struct thread_info *) child->stack)->cpu; |
47906dd9 | 180 | struct user_fxsr_struct fpregs; |
1da177e4 | 181 | |
47906dd9 | 182 | err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs); |
ba180fd4 | 183 | if (err) |
e8012b58 JD |
184 | return err; |
185 | ||
47906dd9 | 186 | n = copy_to_user(buf, &fpregs, sizeof(fpregs)); |
e8012b58 | 187 | if(n > 0) |
ba180fd4 | 188 | return -EFAULT; |
1da177e4 | 189 | |
e8012b58 | 190 | return n; |
1da177e4 LT |
191 | } |
192 | ||
e8012b58 | 193 | int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child) |
1da177e4 | 194 | { |
e8012b58 | 195 | int n, cpu = ((struct thread_info *) child->stack)->cpu; |
47906dd9 | 196 | struct user_fxsr_struct fpregs; |
e8012b58 | 197 | |
47906dd9 | 198 | n = copy_from_user(&fpregs, buf, sizeof(fpregs)); |
e8012b58 JD |
199 | if (n > 0) |
200 | return -EFAULT; | |
201 | ||
47906dd9 JD |
202 | return restore_fpx_registers(userspace_pid[cpu], |
203 | (unsigned long *) &fpregs); | |
1da177e4 LT |
204 | } |
205 | ||
e8012b58 JD |
206 | long subarch_ptrace(struct task_struct *child, long request, long addr, |
207 | long data) | |
208 | { | |
209 | return -EIO; | |
210 | } |