Linux Kernel  3.7.1
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registers.c
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1 /*
2  * Copyright (C) 2004 PathScale, Inc
3  * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4  * Licensed under the GPL
5  */
6 
7 #include <errno.h>
8 #include <sys/ptrace.h>
9 #ifdef __i386__
10 #include <sys/user.h>
11 #endif
12 #include <longjmp.h>
13 #include <sysdep/ptrace_user.h>
14 
15 int save_fp_registers(int pid, unsigned long *fp_regs)
16 {
17  if (ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
18  return -errno;
19  return 0;
20 }
21 
22 int restore_fp_registers(int pid, unsigned long *fp_regs)
23 {
24  if (ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
25  return -errno;
26  return 0;
27 }
28 
29 #ifdef __i386__
30 int have_fpx_regs = 1;
31 int save_fpx_registers(int pid, unsigned long *fp_regs)
32 {
33  if (ptrace(PTRACE_GETFPXREGS, pid, 0, fp_regs) < 0)
34  return -errno;
35  return 0;
36 }
37 
38 int restore_fpx_registers(int pid, unsigned long *fp_regs)
39 {
40  if (ptrace(PTRACE_SETFPXREGS, pid, 0, fp_regs) < 0)
41  return -errno;
42  return 0;
43 }
44 
45 int get_fp_registers(int pid, unsigned long *regs)
46 {
47  if (have_fpx_regs)
48  return save_fpx_registers(pid, regs);
49  else
50  return save_fp_registers(pid, regs);
51 }
52 
53 int put_fp_registers(int pid, unsigned long *regs)
54 {
55  if (have_fpx_regs)
56  return restore_fpx_registers(pid, regs);
57  else
58  return restore_fp_registers(pid, regs);
59 }
60 
61 void arch_init_registers(int pid)
62 {
63  struct user_fpxregs_struct fpx_regs;
64  int err;
65 
66  err = ptrace(PTRACE_GETFPXREGS, pid, 0, &fpx_regs);
67  if (!err)
68  return;
69 
70  if (errno != EIO)
71  panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d",
72  errno);
73 
74  have_fpx_regs = 0;
75 }
76 #else
77 
78 int get_fp_registers(int pid, unsigned long *regs)
79 {
80  return save_fp_registers(pid, regs);
81 }
82 
83 int put_fp_registers(int pid, unsigned long *regs)
84 {
85  return restore_fp_registers(pid, regs);
86 }
87 
88 #endif
89 
90 unsigned long get_thread_reg(int reg, jmp_buf *buf)
91 {
92  switch (reg) {
93 #ifdef __i386__
94  case HOST_IP:
95  return buf[0]->__eip;
96  case HOST_SP:
97  return buf[0]->__esp;
98  case HOST_BP:
99  return buf[0]->__ebp;
100 #else
101  case HOST_IP:
102  return buf[0]->__rip;
103  case HOST_SP:
104  return buf[0]->__rsp;
105  case HOST_BP:
106  return buf[0]->__rbp;
107 #endif
108  default:
109  printk(UM_KERN_ERR "get_thread_regs - unknown register %d\n",
110  reg);
111  return 0;
112  }
113 }