2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
7 #include <linux/sched.h>
8 #include <asm/uaccess.h>
9 #include <asm/ptrace-abi.h>
12 extern int arch_switch_tls(struct task_struct
*to
);
14 void arch_switch_to(struct task_struct
*to
)
16 int err
= arch_switch_tls(to
);
21 printk(KERN_WARNING
"arch_switch_tls failed, errno %d, "
22 "not EINVAL\n", -err
);
24 printk(KERN_WARNING
"arch_switch_tls failed, errno = EINVAL\n");
27 int is_syscall(unsigned long addr
)
32 n
= copy_from_user(&instr
, (void __user
*) addr
, sizeof(instr
));
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.
39 n
= access_process_vm(current
, addr
, &instr
, sizeof(instr
), 0);
40 if (n
!= sizeof(instr
)) {
41 printk(KERN_ERR
"is_syscall : failed to read "
42 "instruction from 0x%lx\n", addr
);
46 /* int 0x80 or sysenter */
47 return (instr
== 0x80cd) || (instr
== 0x340f);
50 /* determines which flags the user has access to. */
51 /* 1 = access 0 = no access */
52 #define FLAG_MASK 0x00044dd5
54 static const int reg_offsets
[] = {
71 [ORIG_EAX
] = HOST_ORIG_AX
,
74 int putreg(struct task_struct
*child
, int regno
, unsigned long value
)
90 if (value
&& (value
& 3) != 3)
94 if (value
&& (value
& 3) != 3)
99 if (value
&& (value
& 3) != 3)
105 if ((value
& 3) != 3)
111 child
->thread
.regs
.regs
.gp
[HOST_EFLAGS
] |= value
;
114 panic("Bad register in putreg() : %d\n", regno
);
116 child
->thread
.regs
.regs
.gp
[reg_offsets
[regno
]] = value
;
120 int poke_user(struct task_struct
*child
, long addr
, long data
)
122 if ((addr
& 3) || addr
< 0)
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]);
131 if ((addr
== 4) || (addr
== 5))
133 child
->thread
.arch
.debugregs
[addr
] = data
;
139 unsigned long getreg(struct task_struct
*child
, int regno
)
141 unsigned long mask
= ~0UL;
166 panic("Bad register in getreg() : %d\n", regno
);
168 return mask
& child
->thread
.regs
.regs
.gp
[reg_offsets
[regno
]];
171 /* read the word at location addr in the USER area. */
172 int peek_user(struct task_struct
*child
, long addr
, long data
)
176 if ((addr
& 3) || addr
< 0)
179 tmp
= 0; /* Default return condition */
180 if (addr
< MAX_REG_OFFSET
) {
181 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]);
187 tmp
= child
->thread
.arch
.debugregs
[addr
];
189 return put_user(tmp
, (unsigned long __user
*) data
);
192 static int get_fpregs(struct user_i387_struct __user
*buf
, struct task_struct
*child
)
194 int err
, n
, cpu
= ((struct thread_info
*) child
->stack
)->cpu
;
195 struct user_i387_struct fpregs
;
197 err
= save_fp_registers(userspace_pid
[cpu
], (unsigned long *) &fpregs
);
201 n
= copy_to_user(buf
, &fpregs
, sizeof(fpregs
));
208 static int set_fpregs(struct user_i387_struct __user
*buf
, struct task_struct
*child
)
210 int n
, cpu
= ((struct thread_info
*) child
->stack
)->cpu
;
211 struct user_i387_struct fpregs
;
213 n
= copy_from_user(&fpregs
, buf
, sizeof(fpregs
));
217 return restore_fp_registers(userspace_pid
[cpu
],
218 (unsigned long *) &fpregs
);
221 static int get_fpxregs(struct user_fxsr_struct __user
*buf
, struct task_struct
*child
)
223 int err
, n
, cpu
= ((struct thread_info
*) child
->stack
)->cpu
;
224 struct user_fxsr_struct fpregs
;
226 err
= save_fpx_registers(userspace_pid
[cpu
], (unsigned long *) &fpregs
);
230 n
= copy_to_user(buf
, &fpregs
, sizeof(fpregs
));
237 static int set_fpxregs(struct user_fxsr_struct __user
*buf
, struct task_struct
*child
)
239 int n
, cpu
= ((struct thread_info
*) child
->stack
)->cpu
;
240 struct user_fxsr_struct fpregs
;
242 n
= copy_from_user(&fpregs
, buf
, sizeof(fpregs
));
246 return restore_fpx_registers(userspace_pid
[cpu
],
247 (unsigned long *) &fpregs
);
250 long subarch_ptrace(struct task_struct
*child
, long request
,
251 unsigned long addr
, unsigned long data
)
254 void __user
*datap
= (void __user
*) data
;
256 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
257 ret
= get_fpregs(datap
, child
);
259 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
260 ret
= set_fpregs(datap
, child
);
262 case PTRACE_GETFPXREGS
: /* Get the child FPU state. */
263 ret
= get_fpxregs(datap
, child
);
265 case PTRACE_SETFPXREGS
: /* Set the child FPU state. */
266 ret
= set_fpxregs(datap
, child
);
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