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authorAl Viro <viro@ftp.linux.org.uk>2011-08-18 15:06:39 -0400
committerRichard Weinberger <richard@nod.at>2011-11-02 09:15:05 -0400
commit5c48b108ecbf6505d929e64d50dace13ac2bdf34 (patch)
tree016904f84fbe05aa301c5cdfe712d90f6bb828fe /arch/x86/um/ptrace_64.c
parent7bbe7204e93734fe79d8aac3e08a7cb4624b5004 (diff)
um: take arch/um/sys-x86 to arch/x86/um
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/x86/um/ptrace_64.c')
-rw-r--r--arch/x86/um/ptrace_64.c271
1 files changed, 271 insertions, 0 deletions
diff --git a/arch/x86/um/ptrace_64.c b/arch/x86/um/ptrace_64.c
new file mode 100644
index 000000000000..44e68e0c0d10
--- /dev/null
+++ b/arch/x86/um/ptrace_64.c
@@ -0,0 +1,271 @@
1/*
2 * Copyright 2003 PathScale, Inc.
3 * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 *
5 * Licensed under the GPL
6 */
7
8#include <linux/mm.h>
9#include <linux/sched.h>
10#include <linux/errno.h>
11#define __FRAME_OFFSETS
12#include <asm/ptrace.h>
13#include <asm/uaccess.h>
14
15/*
16 * determines which flags the user has access to.
17 * 1 = access 0 = no access
18 */
19#define FLAG_MASK 0x44dd5UL
20
21static const int reg_offsets[] =
22{
23 [R8 >> 3] = HOST_R8,
24 [R9 >> 3] = HOST_R9,
25 [R10 >> 3] = HOST_R10,
26 [R11 >> 3] = HOST_R11,
27 [R12 >> 3] = HOST_R12,
28 [R13 >> 3] = HOST_R13,
29 [R14 >> 3] = HOST_R14,
30 [R15 >> 3] = HOST_R15,
31 [RIP >> 3] = HOST_IP,
32 [RSP >> 3] = HOST_SP,
33 [RAX >> 3] = HOST_RAX,
34 [RBX >> 3] = HOST_RBX,
35 [RCX >> 3] = HOST_RCX,
36 [RDX >> 3] = HOST_RDX,
37 [RSI >> 3] = HOST_RSI,
38 [RDI >> 3] = HOST_RDI,
39 [RBP >> 3] = HOST_RBP,
40 [CS >> 3] = HOST_CS,
41 [SS >> 3] = HOST_SS,
42 [FS_BASE >> 3] = HOST_FS_BASE,
43 [GS_BASE >> 3] = HOST_GS_BASE,
44 [DS >> 3] = HOST_DS,
45 [ES >> 3] = HOST_ES,
46 [FS >> 3] = HOST_FS,
47 [GS >> 3] = HOST_GS,
48 [EFLAGS >> 3] = HOST_EFLAGS,
49 [ORIG_RAX >> 3] = HOST_ORIG_RAX,
50};
51
52int putreg(struct task_struct *child, int regno, unsigned long value)
53{
54#ifdef TIF_IA32
55 /*
56 * Some code in the 64bit emulation may not be 64bit clean.
57 * Don't take any chances.
58 */
59 if (test_tsk_thread_flag(child, TIF_IA32))
60 value &= 0xffffffff;
61#endif
62 switch (regno) {
63 case R8:
64 case R9:
65 case R10:
66 case R11:
67 case R12:
68 case R13:
69 case R14:
70 case R15:
71 case RIP:
72 case RSP:
73 case RAX:
74 case RBX:
75 case RCX:
76 case RDX:
77 case RSI:
78 case RDI:
79 case RBP:
80 case ORIG_RAX:
81 break;
82
83 case FS:
84 case GS:
85 case DS:
86 case ES:
87 case SS:
88 case CS:
89 if (value && (value & 3) != 3)
90 return -EIO;
91 value &= 0xffff;
92 break;
93
94 case FS_BASE:
95 case GS_BASE:
96 if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
97 return -EIO;
98 break;
99
100 case EFLAGS:
101 value &= FLAG_MASK;
102 child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
103 return 0;
104
105 default:
106 panic("Bad register in putreg(): %d\n", regno);
107 }
108
109 child->thread.regs.regs.gp[reg_offsets[regno >> 3]] = value;
110 return 0;
111}
112
113int poke_user(struct task_struct *child, long addr, long data)
114{
115 if ((addr & 3) || addr < 0)
116 return -EIO;
117
118 if (addr < MAX_REG_OFFSET)
119 return putreg(child, addr, data);
120 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
121 (addr <= offsetof(struct user, u_debugreg[7]))) {
122 addr -= offsetof(struct user, u_debugreg[0]);
123 addr = addr >> 2;
124 if ((addr == 4) || (addr == 5))
125 return -EIO;
126 child->thread.arch.debugregs[addr] = data;
127 return 0;
128 }
129 return -EIO;
130}
131
132unsigned long getreg(struct task_struct *child, int regno)
133{
134 unsigned long mask = ~0UL;
135#ifdef TIF_IA32
136 if (test_tsk_thread_flag(child, TIF_IA32))
137 mask = 0xffffffff;
138#endif
139 switch (regno) {
140 case R8:
141 case R9:
142 case R10:
143 case R11:
144 case R12:
145 case R13:
146 case R14:
147 case R15:
148 case RIP:
149 case RSP:
150 case RAX:
151 case RBX:
152 case RCX:
153 case RDX:
154 case RSI:
155 case RDI:
156 case RBP:
157 case ORIG_RAX:
158 case EFLAGS:
159 case FS_BASE:
160 case GS_BASE:
161 break;
162 case FS:
163 case GS:
164 case DS:
165 case ES:
166 case SS:
167 case CS:
168 mask = 0xffff;
169 break;
170 default:
171 panic("Bad register in getreg: %d\n", regno);
172 }
173 return mask & child->thread.regs.regs.gp[reg_offsets[regno >> 3]];
174}
175
176int peek_user(struct task_struct *child, long addr, long data)
177{
178 /* read the word at location addr in the USER area. */
179 unsigned long tmp;
180
181 if ((addr & 3) || addr < 0)
182 return -EIO;
183
184 tmp = 0; /* Default return condition */
185 if (addr < MAX_REG_OFFSET)
186 tmp = getreg(child, addr);
187 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
188 (addr <= offsetof(struct user, u_debugreg[7]))) {
189 addr -= offsetof(struct user, u_debugreg[0]);
190 addr = addr >> 2;
191 tmp = child->thread.arch.debugregs[addr];
192 }
193 return put_user(tmp, (unsigned long *) data);
194}
195
196/* XXX Mostly copied from sys-i386 */
197int is_syscall(unsigned long addr)
198{
199 unsigned short instr;
200 int n;
201
202 n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
203 if (n) {
204 /*
205 * access_process_vm() grants access to vsyscall and stub,
206 * while copy_from_user doesn't. Maybe access_process_vm is
207 * slow, but that doesn't matter, since it will be called only
208 * in case of singlestepping, if copy_from_user failed.
209 */
210 n = access_process_vm(current, addr, &instr, sizeof(instr), 0);
211 if (n != sizeof(instr)) {
212 printk("is_syscall : failed to read instruction from "
213 "0x%lx\n", addr);
214 return 1;
215 }
216 }
217 /* sysenter */
218 return instr == 0x050f;
219}
220
221static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
222{
223 int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
224 long fpregs[HOST_FP_SIZE];
225
226 BUG_ON(sizeof(*buf) != sizeof(fpregs));
227 err = save_fp_registers(userspace_pid[cpu], 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_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
239{
240 int n, cpu = ((struct thread_info *) child->stack)->cpu;
241 long fpregs[HOST_FP_SIZE];
242
243 BUG_ON(sizeof(*buf) != sizeof(fpregs));
244 n = copy_from_user(fpregs, buf, sizeof(fpregs));
245 if (n > 0)
246 return -EFAULT;
247
248 return restore_fp_registers(userspace_pid[cpu], 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
257 switch (request) {
258 case PTRACE_GETFPREGS: /* Get the child FPU state. */
259 ret = get_fpregs(datap, child);
260 break;
261 case PTRACE_SETFPREGS: /* Set the child FPU state. */
262 ret = set_fpregs(datap, child);
263 break;
264 case PTRACE_ARCH_PRCTL:
265 /* XXX Calls ptrace on the host - needs some SMP thinking */
266 ret = arch_prctl(child, data, (void __user *) addr);
267 break;
268 }
269
270 return ret;
271}
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