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-rw-r--r--arch/x86/um/ptrace_32.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/arch/x86/um/ptrace_32.c b/arch/x86/um/ptrace_32.c
new file mode 100644
index 000000000000..3b949daa095c
--- /dev/null
+++ b/arch/x86/um/ptrace_32.c
@@ -0,0 +1,273 @@
1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/mm.h"
7#include "linux/sched.h"
8#include "asm/uaccess.h"
9#include "skas.h"
10
11extern int arch_switch_tls(struct task_struct *to);
12
13void arch_switch_to(struct task_struct *to)
14{
15 int err = arch_switch_tls(to);
16 if (!err)
17 return;
18
19 if (err != -EINVAL)
20 printk(KERN_WARNING "arch_switch_tls failed, errno %d, "
21 "not EINVAL\n", -err);
22 else
23 printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
24}
25
26int 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));
32 if (n) {
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);
39 if (n != sizeof(instr)) {
40 printk(KERN_ERR "is_syscall : failed to read "
41 "instruction from 0x%lx\n", addr);
42 return 1;
43 }
44 }
45 /* int 0x80 or sysenter */
46 return (instr == 0x80cd) || (instr == 0x340f);
47}
48
49/* determines which flags the user has access to. */
50/* 1 = access 0 = no access */
51#define FLAG_MASK 0x00044dd5
52
53static const int reg_offsets[] = {
54 [EBX] = HOST_BX,
55 [ECX] = HOST_CX,
56 [EDX] = HOST_DX,
57 [ESI] = HOST_SI,
58 [EDI] = HOST_DI,
59 [EBP] = HOST_BP,
60 [EAX] = HOST_AX,
61 [DS] = HOST_DS,
62 [ES] = HOST_ES,
63 [FS] = HOST_FS,
64 [GS] = HOST_GS,
65 [EIP] = HOST_IP,
66 [CS] = HOST_CS,
67 [EFL] = HOST_EFLAGS,
68 [UESP] = HOST_SP,
69 [SS] = HOST_SS,
70};
71
72int putreg(struct task_struct *child, int regno, unsigned long value)
73{
74 regno >>= 2;
75 switch (regno) {
76 case EBX:
77 case ECX:
78 case EDX:
79 case ESI:
80 case EDI:
81 case EBP:
82 case EAX:
83 case EIP:
84 case UESP:
85 break;
86 case FS:
87 if (value && (value & 3) != 3)
88 return -EIO;
89 break;
90 case GS:
91 if (value && (value & 3) != 3)
92 return -EIO;
93 break;
94 case DS:
95 case ES:
96 if (value && (value & 3) != 3)
97 return -EIO;
98 value &= 0xffff;
99 break;
100 case SS:
101 case CS:
102 if ((value & 3) != 3)
103 return -EIO;
104 value &= 0xffff;
105 break;
106 case EFL:
107 value &= FLAG_MASK;
108 child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
109 return 0;
110 case ORIG_EAX:
111 child->thread.regs.regs.syscall = value;
112 return 0;
113 default :
114 panic("Bad register in putreg() : %d\n", regno);
115 }
116 child->thread.regs.regs.gp[reg_offsets[regno]] = value;
117 return 0;
118}
119
120int poke_user(struct task_struct *child, long addr, long data)
121{
122 if ((addr & 3) || addr < 0)
123 return -EIO;
124
125 if (addr < MAX_REG_OFFSET)
126 return putreg(child, addr, data);
127 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
128 (addr <= offsetof(struct user, u_debugreg[7]))) {
129 addr -= offsetof(struct user, u_debugreg[0]);
130 addr = addr >> 2;
131 if ((addr == 4) || (addr == 5))
132 return -EIO;
133 child->thread.arch.debugregs[addr] = data;
134 return 0;
135 }
136 return -EIO;
137}
138
139unsigned long getreg(struct task_struct *child, int regno)
140{
141 unsigned long mask = ~0UL;
142
143 regno >>= 2;
144 switch (regno) {
145 case ORIG_EAX:
146 return child->thread.regs.regs.syscall;
147 case FS:
148 case GS:
149 case DS:
150 case ES:
151 case SS:
152 case CS:
153 mask = 0xffff;
154 break;
155 case EIP:
156 case UESP:
157 case EAX:
158 case EBX:
159 case ECX:
160 case EDX:
161 case ESI:
162 case EDI:
163 case EBP:
164 case EFL:
165 break;
166 default:
167 panic("Bad register in getreg() : %d\n", regno);
168 }
169 return mask & child->thread.regs.regs.gp[reg_offsets[regno]];
170}
171
172/* read the word at location addr in the USER area. */
173int peek_user(struct task_struct *child, long addr, long data)
174{
175 unsigned long tmp;
176
177 if ((addr & 3) || addr < 0)
178 return -EIO;
179
180 tmp = 0; /* Default return condition */
181 if (addr < MAX_REG_OFFSET) {
182 tmp = getreg(child, addr);
183 }
184 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
185 (addr <= offsetof(struct user, u_debugreg[7]))) {
186 addr -= offsetof(struct user, u_debugreg[0]);
187 addr = addr >> 2;
188 tmp = child->thread.arch.debugregs[addr];
189 }
190 return put_user(tmp, (unsigned long __user *) data);
191}
192
193static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
194{
195 int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
196 struct user_i387_struct fpregs;
197
198 err = save_fp_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
199 if (err)
200 return err;
201
202 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
203 if(n > 0)
204 return -EFAULT;
205
206 return n;
207}
208
209static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
210{
211 int n, cpu = ((struct thread_info *) child->stack)->cpu;
212 struct user_i387_struct fpregs;
213
214 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
215 if (n > 0)
216 return -EFAULT;
217
218 return restore_fp_registers(userspace_pid[cpu],
219 (unsigned long *) &fpregs);
220}
221
222static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
223{
224 int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
225 struct user_fxsr_struct fpregs;
226
227 err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
228 if (err)
229 return err;
230
231 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
232 if(n > 0)
233 return -EFAULT;
234
235 return n;
236}
237
238static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
239{
240 int n, cpu = ((struct thread_info *) child->stack)->cpu;
241 struct user_fxsr_struct fpregs;
242
243 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
244 if (n > 0)
245 return -EFAULT;
246
247 return restore_fpx_registers(userspace_pid[cpu],
248 (unsigned long *) &fpregs);
249}
250
251long subarch_ptrace(struct task_struct *child, long request,
252 unsigned long addr, unsigned long data)
253{
254 int ret = -EIO;
255 void __user *datap = (void __user *) data;
256 switch (request) {
257 case PTRACE_GETFPREGS: /* Get the child FPU state. */
258 ret = get_fpregs(datap, child);
259 break;
260 case PTRACE_SETFPREGS: /* Set the child FPU state. */
261 ret = set_fpregs(datap, child);
262 break;
263 case PTRACE_GETFPXREGS: /* Get the child FPU state. */
264 ret = get_fpxregs(datap, child);
265 break;
266 case PTRACE_SETFPXREGS: /* Set the child FPU state. */
267 ret = set_fpxregs(datap, child);
268 break;
269 default:
270 ret = -EIO;
271 }
272 return ret;
273}
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