1/*
2 * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
3 * Licensed under the GPL
4 */
5
6#ifndef __SYSDEP_STUB_H
7#define __SYSDEP_STUB_H
8
9#include <sysdep/ptrace_user.h>
10
11#define STUB_SYSCALL_RET PT_INDEX(RAX)
12#define STUB_MMAP_NR __NR_mmap
13#define MMAP_OFFSET(o) (o)
14
15#define __syscall_clobber "r11","rcx","memory"
16#define __syscall "syscall"
17
18static inline long stub_syscall0(long syscall)
19{
20	long ret;
21
22	__asm__ volatile (__syscall
23		: "=a" (ret)
24		: "0" (syscall) : __syscall_clobber );
25
26	return ret;
27}
28
29static inline long stub_syscall2(long syscall, long arg1, long arg2)
30{
31	long ret;
32
33	__asm__ volatile (__syscall
34		: "=a" (ret)
35		: "0" (syscall), "D" (arg1), "S" (arg2) : __syscall_clobber );
36
37	return ret;
38}
39
40static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
41{
42	long ret;
43
44	__asm__ volatile (__syscall
45		: "=a" (ret)
46		: "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3)
47		: __syscall_clobber );
48
49	return ret;
50}
51
52static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
53				 long arg4)
54{
55	long ret;
56
57	__asm__ volatile ("movq %5,%%r10 ; " __syscall
58		: "=a" (ret)
59		: "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
60		  "g" (arg4)
61		: __syscall_clobber, "r10" );
62
63	return ret;
64}
65
66static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
67				 long arg4, long arg5)
68{
69	long ret;
70
71	__asm__ volatile ("movq %5,%%r10 ; movq %6,%%r8 ; " __syscall
72		: "=a" (ret)
73		: "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
74		  "g" (arg4), "g" (arg5)
75		: __syscall_clobber, "r10", "r8" );
76
77	return ret;
78}
79
80static inline void trap_myself(void)
81{
82	__asm("int3");
83}
84
85static inline void remap_stack(long fd, unsigned long offset)
86{
87	__asm__ volatile ("movq %4,%%r10 ; movq %5,%%r8 ; "
88			  "movq %6, %%r9; " __syscall "; movq %7, %%rbx ; "
89			  "movq %%rax, (%%rbx)":
90			  : "a" (STUB_MMAP_NR), "D" (STUB_DATA),
91			    "S" (UM_KERN_PAGE_SIZE),
92			    "d" (PROT_READ | PROT_WRITE),
93                            "g" (MAP_FIXED | MAP_SHARED), "g" (fd),
94			    "g" (offset),
95			    "i" (&((struct stub_data *) STUB_DATA)->err)
96			  : __syscall_clobber, "r10", "r8", "r9" );
97}
98
99#endif
100