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 <stdlib.h>
9#include <sys/ptrace.h>
10#ifdef __i386__
11#include <sys/user.h>
12#endif
13#include <longjmp.h>
14#include <sysdep/ptrace_user.h>
15#include <sys/uio.h>
16#include <asm/sigcontext.h>
17#include <linux/elf.h>
18
19int have_xstate_support;
20
21int save_i387_registers(int pid, unsigned long *fp_regs)
22{
23	if (ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
24		return -errno;
25	return 0;
26}
27
28int save_fp_registers(int pid, unsigned long *fp_regs)
29{
30#ifdef PTRACE_GETREGSET
31	struct iovec iov;
32
33	if (have_xstate_support) {
34		iov.iov_base = fp_regs;
35		iov.iov_len = FP_SIZE * sizeof(unsigned long);
36		if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
37			return -errno;
38		return 0;
39	} else
40#endif
41		return save_i387_registers(pid, fp_regs);
42}
43
44int restore_i387_registers(int pid, unsigned long *fp_regs)
45{
46	if (ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
47		return -errno;
48	return 0;
49}
50
51int restore_fp_registers(int pid, unsigned long *fp_regs)
52{
53#ifdef PTRACE_SETREGSET
54	struct iovec iov;
55	if (have_xstate_support) {
56		iov.iov_base = fp_regs;
57		iov.iov_len = FP_SIZE * sizeof(unsigned long);
58		if (ptrace(PTRACE_SETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
59			return -errno;
60		return 0;
61	} else
62#endif
63		return restore_i387_registers(pid, fp_regs);
64}
65
66#ifdef __i386__
67int have_fpx_regs = 1;
68int save_fpx_registers(int pid, unsigned long *fp_regs)
69{
70	if (ptrace(PTRACE_GETFPXREGS, pid, 0, fp_regs) < 0)
71		return -errno;
72	return 0;
73}
74
75int restore_fpx_registers(int pid, unsigned long *fp_regs)
76{
77	if (ptrace(PTRACE_SETFPXREGS, pid, 0, fp_regs) < 0)
78		return -errno;
79	return 0;
80}
81
82int get_fp_registers(int pid, unsigned long *regs)
83{
84	if (have_fpx_regs)
85		return save_fpx_registers(pid, regs);
86	else
87		return save_fp_registers(pid, regs);
88}
89
90int put_fp_registers(int pid, unsigned long *regs)
91{
92	if (have_fpx_regs)
93		return restore_fpx_registers(pid, regs);
94	else
95		return restore_fp_registers(pid, regs);
96}
97
98void arch_init_registers(int pid)
99{
100	struct user_fpxregs_struct fpx_regs;
101	int err;
102
103	err = ptrace(PTRACE_GETFPXREGS, pid, 0, &fpx_regs);
104	if (!err)
105		return;
106
107	if (errno != EIO)
108		panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d",
109		      errno);
110
111	have_fpx_regs = 0;
112}
113#else
114
115int get_fp_registers(int pid, unsigned long *regs)
116{
117	return save_fp_registers(pid, regs);
118}
119
120int put_fp_registers(int pid, unsigned long *regs)
121{
122	return restore_fp_registers(pid, regs);
123}
124
125void arch_init_registers(int pid)
126{
127#ifdef PTRACE_GETREGSET
128	void * fp_regs;
129	struct iovec iov;
130
131	fp_regs = malloc(FP_SIZE * sizeof(unsigned long));
132	if(fp_regs == NULL)
133		return;
134
135	iov.iov_base = fp_regs;
136	iov.iov_len = FP_SIZE * sizeof(unsigned long);
137	if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) == 0)
138		have_xstate_support = 1;
139
140	free(fp_regs);
141#endif
142}
143#endif
144
145unsigned long get_thread_reg(int reg, jmp_buf *buf)
146{
147	switch (reg) {
148#ifdef __i386__
149	case HOST_IP:
150		return buf[0]->__eip;
151	case HOST_SP:
152		return buf[0]->__esp;
153	case HOST_BP:
154		return buf[0]->__ebp;
155#else
156	case HOST_IP:
157		return buf[0]->__rip;
158	case HOST_SP:
159		return buf[0]->__rsp;
160	case HOST_BP:
161		return buf[0]->__rbp;
162#endif
163	default:
164		printk(UM_KERN_ERR "get_thread_regs - unknown register %d\n",
165		       reg);
166		return 0;
167	}
168}
169