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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#include <linux/regset.h>
12#define __FRAME_OFFSETS
13#include <asm/ptrace.h>
14#include <linux/uaccess.h>
15#include <registers.h>
16#include <asm/ptrace-abi.h>
17
18/*
19 * determines which flags the user has access to.
20 * 1 = access 0 = no access
21 */
22#define FLAG_MASK 0x44dd5UL
23
24static const int reg_offsets[] =
25{
26 [R8 >> 3] = HOST_R8,
27 [R9 >> 3] = HOST_R9,
28 [R10 >> 3] = HOST_R10,
29 [R11 >> 3] = HOST_R11,
30 [R12 >> 3] = HOST_R12,
31 [R13 >> 3] = HOST_R13,
32 [R14 >> 3] = HOST_R14,
33 [R15 >> 3] = HOST_R15,
34 [RIP >> 3] = HOST_IP,
35 [RSP >> 3] = HOST_SP,
36 [RAX >> 3] = HOST_AX,
37 [RBX >> 3] = HOST_BX,
38 [RCX >> 3] = HOST_CX,
39 [RDX >> 3] = HOST_DX,
40 [RSI >> 3] = HOST_SI,
41 [RDI >> 3] = HOST_DI,
42 [RBP >> 3] = HOST_BP,
43 [CS >> 3] = HOST_CS,
44 [SS >> 3] = HOST_SS,
45 [FS_BASE >> 3] = HOST_FS_BASE,
46 [GS_BASE >> 3] = HOST_GS_BASE,
47 [DS >> 3] = HOST_DS,
48 [ES >> 3] = HOST_ES,
49 [FS >> 3] = HOST_FS,
50 [GS >> 3] = HOST_GS,
51 [EFLAGS >> 3] = HOST_EFLAGS,
52 [ORIG_RAX >> 3] = HOST_ORIG_AX,
53};
54
55int putreg(struct task_struct *child, int regno, unsigned long value)
56{
57 switch (regno) {
58 case R8:
59 case R9:
60 case R10:
61 case R11:
62 case R12:
63 case R13:
64 case R14:
65 case R15:
66 case RIP:
67 case RSP:
68 case RAX:
69 case RBX:
70 case RCX:
71 case RDX:
72 case RSI:
73 case RDI:
74 case RBP:
75 break;
76
77 case ORIG_RAX:
78 /* Update the syscall number. */
79 UPT_SYSCALL_NR(&child->thread.regs.regs) = value;
80 break;
81
82 case FS:
83 case GS:
84 case DS:
85 case ES:
86 case SS:
87 case CS:
88 if (value && (value & 3) != 3)
89 return -EIO;
90 value &= 0xffff;
91 break;
92
93 case FS_BASE:
94 case GS_BASE:
95 if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
96 return -EIO;
97 break;
98
99 case EFLAGS:
100 value &= FLAG_MASK;
101 child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
102 return 0;
103
104 default:
105 panic("Bad register in putreg(): %d\n", regno);
106 }
107
108 child->thread.regs.regs.gp[reg_offsets[regno >> 3]] = value;
109 return 0;
110}
111
112int poke_user(struct task_struct *child, long addr, long data)
113{
114 if ((addr & 3) || addr < 0)
115 return -EIO;
116
117 if (addr < MAX_REG_OFFSET)
118 return putreg(child, addr, data);
119 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
120 (addr <= offsetof(struct user, u_debugreg[7]))) {
121 addr -= offsetof(struct user, u_debugreg[0]);
122 addr = addr >> 3;
123 if ((addr == 4) || (addr == 5))
124 return -EIO;
125 child->thread.arch.debugregs[addr] = data;
126 return 0;
127 }
128 return -EIO;
129}
130
131unsigned long getreg(struct task_struct *child, int regno)
132{
133 unsigned long mask = ~0UL;
134
135 switch (regno) {
136 case R8:
137 case R9:
138 case R10:
139 case R11:
140 case R12:
141 case R13:
142 case R14:
143 case R15:
144 case RIP:
145 case RSP:
146 case RAX:
147 case RBX:
148 case RCX:
149 case RDX:
150 case RSI:
151 case RDI:
152 case RBP:
153 case ORIG_RAX:
154 case EFLAGS:
155 case FS_BASE:
156 case GS_BASE:
157 break;
158 case FS:
159 case GS:
160 case DS:
161 case ES:
162 case SS:
163 case CS:
164 mask = 0xffff;
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 >> 3]];
170}
171
172int peek_user(struct task_struct *child, long addr, long data)
173{
174 /* read the word at location addr in the USER area. */
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 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
184 (addr <= offsetof(struct user, u_debugreg[7]))) {
185 addr -= offsetof(struct user, u_debugreg[0]);
186 addr = addr >> 2;
187 tmp = child->thread.arch.debugregs[addr];
188 }
189 return put_user(tmp, (unsigned long *) data);
190}
191
192long subarch_ptrace(struct task_struct *child, long request,
193 unsigned long addr, unsigned long data)
194{
195 int ret = -EIO;
196 void __user *datap = (void __user *) data;
197
198 switch (request) {
199 case PTRACE_GETFPREGS: /* Get the child FPU state. */
200 return copy_regset_to_user(child, task_user_regset_view(child),
201 REGSET_FP,
202 0, sizeof(struct user_i387_struct),
203 datap);
204 case PTRACE_SETFPREGS: /* Set the child FPU state. */
205 return copy_regset_from_user(child, task_user_regset_view(child),
206 REGSET_FP,
207 0, sizeof(struct user_i387_struct),
208 datap);
209 case PTRACE_ARCH_PRCTL:
210 /* XXX Calls ptrace on the host - needs some SMP thinking */
211 ret = arch_prctl(child, data, (void __user *) addr);
212 break;
213 }
214
215 return ret;
216}
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 <linux/uaccess.h>
14#include <asm/ptrace-abi.h>
15
16/*
17 * determines which flags the user has access to.
18 * 1 = access 0 = no access
19 */
20#define FLAG_MASK 0x44dd5UL
21
22static const int reg_offsets[] =
23{
24 [R8 >> 3] = HOST_R8,
25 [R9 >> 3] = HOST_R9,
26 [R10 >> 3] = HOST_R10,
27 [R11 >> 3] = HOST_R11,
28 [R12 >> 3] = HOST_R12,
29 [R13 >> 3] = HOST_R13,
30 [R14 >> 3] = HOST_R14,
31 [R15 >> 3] = HOST_R15,
32 [RIP >> 3] = HOST_IP,
33 [RSP >> 3] = HOST_SP,
34 [RAX >> 3] = HOST_AX,
35 [RBX >> 3] = HOST_BX,
36 [RCX >> 3] = HOST_CX,
37 [RDX >> 3] = HOST_DX,
38 [RSI >> 3] = HOST_SI,
39 [RDI >> 3] = HOST_DI,
40 [RBP >> 3] = HOST_BP,
41 [CS >> 3] = HOST_CS,
42 [SS >> 3] = HOST_SS,
43 [FS_BASE >> 3] = HOST_FS_BASE,
44 [GS_BASE >> 3] = HOST_GS_BASE,
45 [DS >> 3] = HOST_DS,
46 [ES >> 3] = HOST_ES,
47 [FS >> 3] = HOST_FS,
48 [GS >> 3] = HOST_GS,
49 [EFLAGS >> 3] = HOST_EFLAGS,
50 [ORIG_RAX >> 3] = HOST_ORIG_AX,
51};
52
53int putreg(struct task_struct *child, int regno, unsigned long value)
54{
55#ifdef TIF_IA32
56 /*
57 * Some code in the 64bit emulation may not be 64bit clean.
58 * Don't take any chances.
59 */
60 if (test_tsk_thread_flag(child, TIF_IA32))
61 value &= 0xffffffff;
62#endif
63 switch (regno) {
64 case R8:
65 case R9:
66 case R10:
67 case R11:
68 case R12:
69 case R13:
70 case R14:
71 case R15:
72 case RIP:
73 case RSP:
74 case RAX:
75 case RBX:
76 case RCX:
77 case RDX:
78 case RSI:
79 case RDI:
80 case RBP:
81 break;
82
83 case ORIG_RAX:
84 /* Update the syscall number. */
85 UPT_SYSCALL_NR(&child->thread.regs.regs) = value;
86 break;
87
88 case FS:
89 case GS:
90 case DS:
91 case ES:
92 case SS:
93 case CS:
94 if (value && (value & 3) != 3)
95 return -EIO;
96 value &= 0xffff;
97 break;
98
99 case FS_BASE:
100 case GS_BASE:
101 if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
102 return -EIO;
103 break;
104
105 case EFLAGS:
106 value &= FLAG_MASK;
107 child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
108 return 0;
109
110 default:
111 panic("Bad register in putreg(): %d\n", regno);
112 }
113
114 child->thread.regs.regs.gp[reg_offsets[regno >> 3]] = value;
115 return 0;
116}
117
118int poke_user(struct task_struct *child, long addr, long data)
119{
120 if ((addr & 3) || addr < 0)
121 return -EIO;
122
123 if (addr < MAX_REG_OFFSET)
124 return putreg(child, addr, data);
125 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
126 (addr <= offsetof(struct user, u_debugreg[7]))) {
127 addr -= offsetof(struct user, u_debugreg[0]);
128 addr = addr >> 3;
129 if ((addr == 4) || (addr == 5))
130 return -EIO;
131 child->thread.arch.debugregs[addr] = data;
132 return 0;
133 }
134 return -EIO;
135}
136
137unsigned long getreg(struct task_struct *child, int regno)
138{
139 unsigned long mask = ~0UL;
140#ifdef TIF_IA32
141 if (test_tsk_thread_flag(child, TIF_IA32))
142 mask = 0xffffffff;
143#endif
144 switch (regno) {
145 case R8:
146 case R9:
147 case R10:
148 case R11:
149 case R12:
150 case R13:
151 case R14:
152 case R15:
153 case RIP:
154 case RSP:
155 case RAX:
156 case RBX:
157 case RCX:
158 case RDX:
159 case RSI:
160 case RDI:
161 case RBP:
162 case ORIG_RAX:
163 case EFLAGS:
164 case FS_BASE:
165 case GS_BASE:
166 break;
167 case FS:
168 case GS:
169 case DS:
170 case ES:
171 case SS:
172 case CS:
173 mask = 0xffff;
174 break;
175 default:
176 panic("Bad register in getreg: %d\n", regno);
177 }
178 return mask & child->thread.regs.regs.gp[reg_offsets[regno >> 3]];
179}
180
181int peek_user(struct task_struct *child, long addr, long data)
182{
183 /* read the word at location addr in the USER area. */
184 unsigned long tmp;
185
186 if ((addr & 3) || addr < 0)
187 return -EIO;
188
189 tmp = 0; /* Default return condition */
190 if (addr < MAX_REG_OFFSET)
191 tmp = getreg(child, addr);
192 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
193 (addr <= offsetof(struct user, u_debugreg[7]))) {
194 addr -= offsetof(struct user, u_debugreg[0]);
195 addr = addr >> 2;
196 tmp = child->thread.arch.debugregs[addr];
197 }
198 return put_user(tmp, (unsigned long *) data);
199}
200
201/* XXX Mostly copied from sys-i386 */
202int is_syscall(unsigned long addr)
203{
204 unsigned short instr;
205 int n;
206
207 n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
208 if (n) {
209 /*
210 * access_process_vm() grants access to vsyscall and stub,
211 * while copy_from_user doesn't. Maybe access_process_vm is
212 * slow, but that doesn't matter, since it will be called only
213 * in case of singlestepping, if copy_from_user failed.
214 */
215 n = access_process_vm(current, addr, &instr, sizeof(instr),
216 FOLL_FORCE);
217 if (n != sizeof(instr)) {
218 printk("is_syscall : failed to read instruction from "
219 "0x%lx\n", addr);
220 return 1;
221 }
222 }
223 /* sysenter */
224 return instr == 0x050f;
225}
226
227static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
228{
229 int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
230 struct user_i387_struct fpregs;
231
232 err = save_i387_registers(userspace_pid[cpu],
233 (unsigned long *) &fpregs);
234 if (err)
235 return err;
236
237 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
238 if (n > 0)
239 return -EFAULT;
240
241 return n;
242}
243
244static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
245{
246 int n, cpu = ((struct thread_info *) child->stack)->cpu;
247 struct user_i387_struct fpregs;
248
249 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
250 if (n > 0)
251 return -EFAULT;
252
253 return restore_i387_registers(userspace_pid[cpu],
254 (unsigned long *) &fpregs);
255}
256
257long subarch_ptrace(struct task_struct *child, long request,
258 unsigned long addr, unsigned long data)
259{
260 int ret = -EIO;
261 void __user *datap = (void __user *) data;
262
263 switch (request) {
264 case PTRACE_GETFPREGS: /* Get the child FPU state. */
265 ret = get_fpregs(datap, child);
266 break;
267 case PTRACE_SETFPREGS: /* Set the child FPU state. */
268 ret = set_fpregs(datap, child);
269 break;
270 case PTRACE_ARCH_PRCTL:
271 /* XXX Calls ptrace on the host - needs some SMP thinking */
272 ret = arch_prctl(child, data, (void __user *) addr);
273 break;
274 }
275
276 return ret;
277}