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

  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#include <generated/asm-offsets.h>
 11
 
 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_and_trap(void)
 86{
 87	__asm__ volatile (
 88		"movq %0,%%rax ;"
 89		"movq %%rsp,%%rdi ;"
 90		"andq %1,%%rdi ;"
 91		"movq %2,%%r10 ;"
 92		"movq %%rdi,%%r8 ; addq %3,%%r8 ; movq (%%r8),%%r8 ;"
 93		"movq %%rdi,%%r9 ; addq %4,%%r9 ; movq (%%r9),%%r9 ;"
 94		__syscall ";"
 95		"movq %%rsp,%%rdi ; andq %1,%%rdi ;"
 96		"addq %5,%%rdi ; movq %%rax, (%%rdi) ;"
 97		"int3"
 98		: :
 99		"g" (STUB_MMAP_NR),
100		"g" (~(UM_KERN_PAGE_SIZE - 1)),
101		"g" (MAP_FIXED | MAP_SHARED),
102		"g" (UML_STUB_FIELD_FD),
103		"g" (UML_STUB_FIELD_OFFSET),
104		"g" (UML_STUB_FIELD_CHILD_ERR),
105		"S" (UM_KERN_PAGE_SIZE),
106		"d" (PROT_READ | PROT_WRITE)
107		:
108		__syscall_clobber, "r10", "r8", "r9");
109}
110
111static __always_inline void *get_stub_page(void)
112{
113	unsigned long ret;
114
115	asm volatile (
116		"movq %%rsp,%0 ;"
117		"andq %1,%0"
118		: "=a" (ret)
119		: "g" (~(UM_KERN_PAGE_SIZE - 1)));
120
121	return (void *)ret;
122}
123#endif