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Linux/arch/x86/um/ptrace_32.c

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  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 <linux/uaccess.h>
  9 #include <asm/ptrace-abi.h>
 10 #include <skas.h>
 11 
 12 extern int arch_switch_tls(struct task_struct *to);
 13 
 14 void arch_switch_to(struct task_struct *to)
 15 {
 16         int err = arch_switch_tls(to);
 17         if (!err)
 18                 return;
 19 
 20         if (err != -EINVAL)
 21                 printk(KERN_WARNING "arch_switch_tls failed, errno %d, "
 22                        "not EINVAL\n", -err);
 23         else
 24                 printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
 25 }
 26 
 27 int is_syscall(unsigned long addr)
 28 {
 29         unsigned short instr;
 30         int n;
 31 
 32         n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
 33         if (n) {
 34                 /* access_process_vm() grants access to vsyscall and stub,
 35                  * while copy_from_user doesn't. Maybe access_process_vm is
 36                  * slow, but that doesn't matter, since it will be called only
 37                  * in case of singlestepping, if copy_from_user failed.
 38                  */
 39                 n = access_process_vm(current, addr, &instr, sizeof(instr),
 40                                 FOLL_FORCE);
 41                 if (n != sizeof(instr)) {
 42                         printk(KERN_ERR "is_syscall : failed to read "
 43                                "instruction from 0x%lx\n", addr);
 44                         return 1;
 45                 }
 46         }
 47         /* int 0x80 or sysenter */
 48         return (instr == 0x80cd) || (instr == 0x340f);
 49 }
 50 
 51 /* determines which flags the user has access to. */
 52 /* 1 = access 0 = no access */
 53 #define FLAG_MASK 0x00044dd5
 54 
 55 static const int reg_offsets[] = {
 56         [EBX] = HOST_BX,
 57         [ECX] = HOST_CX,
 58         [EDX] = HOST_DX,
 59         [ESI] = HOST_SI,
 60         [EDI] = HOST_DI,
 61         [EBP] = HOST_BP,
 62         [EAX] = HOST_AX,
 63         [DS] = HOST_DS,
 64         [ES] = HOST_ES,
 65         [FS] = HOST_FS,
 66         [GS] = HOST_GS,
 67         [EIP] = HOST_IP,
 68         [CS] = HOST_CS,
 69         [EFL] = HOST_EFLAGS,
 70         [UESP] = HOST_SP,
 71         [SS] = HOST_SS,
 72         [ORIG_EAX] = HOST_ORIG_AX,
 73 };
 74 
 75 int putreg(struct task_struct *child, int regno, unsigned long value)
 76 {
 77         regno >>= 2;
 78         switch (regno) {
 79         case EBX:
 80         case ECX:
 81         case EDX:
 82         case ESI:
 83         case EDI:
 84         case EBP:
 85         case EAX:
 86         case EIP:
 87         case UESP:
 88                 break;
 89         case ORIG_EAX:
 90                 /* Update the syscall number. */
 91                 UPT_SYSCALL_NR(&child->thread.regs.regs) = value;
 92                 break;
 93         case FS:
 94                 if (value && (value & 3) != 3)
 95                         return -EIO;
 96                 break;
 97         case GS:
 98                 if (value && (value & 3) != 3)
 99                         return -EIO;
100                 break;
101         case DS:
102         case ES:
103                 if (value && (value & 3) != 3)
104                         return -EIO;
105                 value &= 0xffff;
106                 break;
107         case SS:
108         case CS:
109                 if ((value & 3) != 3)
110                         return -EIO;
111                 value &= 0xffff;
112                 break;
113         case EFL:
114                 value &= FLAG_MASK;
115                 child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
116                 return 0;
117         default :
118                 panic("Bad register in putreg() : %d\n", regno);
119         }
120         child->thread.regs.regs.gp[reg_offsets[regno]] = value;
121         return 0;
122 }
123 
124 int poke_user(struct task_struct *child, long addr, long data)
125 {
126         if ((addr & 3) || addr < 0)
127                 return -EIO;
128 
129         if (addr < MAX_REG_OFFSET)
130                 return putreg(child, addr, data);
131         else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
132                  (addr <= offsetof(struct user, u_debugreg[7]))) {
133                 addr -= offsetof(struct user, u_debugreg[0]);
134                 addr = addr >> 2;
135                 if ((addr == 4) || (addr == 5))
136                         return -EIO;
137                 child->thread.arch.debugregs[addr] = data;
138                 return 0;
139         }
140         return -EIO;
141 }
142 
143 unsigned long getreg(struct task_struct *child, int regno)
144 {
145         unsigned long mask = ~0UL;
146 
147         regno >>= 2;
148         switch (regno) {
149         case FS:
150         case GS:
151         case DS:
152         case ES:
153         case SS:
154         case CS:
155                 mask = 0xffff;
156                 break;
157         case EIP:
158         case UESP:
159         case EAX:
160         case EBX:
161         case ECX:
162         case EDX:
163         case ESI:
164         case EDI:
165         case EBP:
166         case EFL:
167         case ORIG_EAX:
168                 break;
169         default:
170                 panic("Bad register in getreg() : %d\n", regno);
171         }
172         return mask & child->thread.regs.regs.gp[reg_offsets[regno]];
173 }
174 
175 /* read the word at location addr in the USER area. */
176 int peek_user(struct task_struct *child, long addr, long data)
177 {
178         unsigned long tmp;
179 
180         if ((addr & 3) || addr < 0)
181                 return -EIO;
182 
183         tmp = 0;  /* Default return condition */
184         if (addr < MAX_REG_OFFSET) {
185                 tmp = getreg(child, addr);
186         }
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 __user *) data);
194 }
195 
196 static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
197 {
198         int err, n, cpu = task_cpu(child);
199         struct user_i387_struct fpregs;
200 
201         err = save_i387_registers(userspace_pid[cpu],
202                                   (unsigned long *) &fpregs);
203         if (err)
204                 return err;
205 
206         n = copy_to_user(buf, &fpregs, sizeof(fpregs));
207         if(n > 0)
208                 return -EFAULT;
209 
210         return n;
211 }
212 
213 static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
214 {
215         int n, cpu = task_cpu(child);
216         struct user_i387_struct fpregs;
217 
218         n = copy_from_user(&fpregs, buf, sizeof(fpregs));
219         if (n > 0)
220                 return -EFAULT;
221 
222         return restore_i387_registers(userspace_pid[cpu],
223                                     (unsigned long *) &fpregs);
224 }
225 
226 static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
227 {
228         int err, n, cpu = task_cpu(child);
229         struct user_fxsr_struct fpregs;
230 
231         err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
232         if (err)
233                 return err;
234 
235         n = copy_to_user(buf, &fpregs, sizeof(fpregs));
236         if(n > 0)
237                 return -EFAULT;
238 
239         return n;
240 }
241 
242 static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
243 {
244         int n, cpu = task_cpu(child);
245         struct user_fxsr_struct fpregs;
246 
247         n = copy_from_user(&fpregs, buf, sizeof(fpregs));
248         if (n > 0)
249                 return -EFAULT;
250 
251         return restore_fpx_registers(userspace_pid[cpu],
252                                      (unsigned long *) &fpregs);
253 }
254 
255 long subarch_ptrace(struct task_struct *child, long request,
256                     unsigned long addr, unsigned long data)
257 {
258         int ret = -EIO;
259         void __user *datap = (void __user *) data;
260         switch (request) {
261         case PTRACE_GETFPREGS: /* Get the child FPU state. */
262                 ret = get_fpregs(datap, child);
263                 break;
264         case PTRACE_SETFPREGS: /* Set the child FPU state. */
265                 ret = set_fpregs(datap, child);
266                 break;
267         case PTRACE_GETFPXREGS: /* Get the child FPU state. */
268                 ret = get_fpxregs(datap, child);
269                 break;
270         case PTRACE_SETFPXREGS: /* Set the child FPU state. */
271                 ret = set_fpxregs(datap, child);
272                 break;
273         default:
274                 ret = -EIO;
275         }
276         return ret;
277 }
278 

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