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 <asm/ptrace.h>
 
10
11#define STUB_SYSCALL_RET EAX
12#define STUB_MMAP_NR __NR_mmap2
13#define MMAP_OFFSET(o) ((o) >> UM_KERN_PAGE_SHIFT)
14
15static inline long stub_syscall0(long syscall)
16{
17	long ret;
18
19	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall));
 
20
21	return ret;
22}
23
24static inline long stub_syscall1(long syscall, long arg1)
25{
26	long ret;
27
28	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1));
 
29
30	return ret;
31}
32
33static inline long stub_syscall2(long syscall, long arg1, long arg2)
34{
35	long ret;
36
37	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
38			"c" (arg2));
 
39
40	return ret;
41}
42
43static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
 
44{
45	long ret;
46
47	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
48			"c" (arg2), "d" (arg3));
 
49
50	return ret;
51}
52
53static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
54				 long arg4)
55{
56	long ret;
57
58	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
59			"c" (arg2), "d" (arg3), "S" (arg4));
 
60
61	return ret;
62}
63
64static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
65				 long arg4, long arg5)
66{
67	long ret;
68
69	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
70			"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5));
 
71
72	return ret;
73}
74
75static inline void trap_myself(void)
76{
77	__asm("int3");
78}
79
80static inline void remap_stack(int fd, unsigned long offset)
81{
82	__asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;"
83			  "movl %7, %%ebx ; movl %%eax, (%%ebx)"
84			  : : "g" (STUB_MMAP_NR), "b" (STUB_DATA),
85			    "c" (UM_KERN_PAGE_SIZE),
86			    "d" (PROT_READ | PROT_WRITE),
87			    "S" (MAP_FIXED | MAP_SHARED), "D" (fd),
88			    "a" (offset),
89			    "i" (&((struct stub_data *) STUB_DATA)->err)
90			  : "memory");
91}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
92
 
 
93#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 <asm/ptrace.h>
 10#include <generated/asm-offsets.h>
 11
 
 12#define STUB_MMAP_NR __NR_mmap2
 13#define MMAP_OFFSET(o) ((o) >> UM_KERN_PAGE_SHIFT)
 14
 15static __always_inline long stub_syscall0(long syscall)
 16{
 17	long ret;
 18
 19	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall)
 20			: "memory");
 21
 22	return ret;
 23}
 24
 25static __always_inline long stub_syscall1(long syscall, long arg1)
 26{
 27	long ret;
 28
 29	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1)
 30			: "memory");
 31
 32	return ret;
 33}
 34
 35static __always_inline long stub_syscall2(long syscall, long arg1, long arg2)
 36{
 37	long ret;
 38
 39	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
 40			"c" (arg2)
 41			: "memory");
 42
 43	return ret;
 44}
 45
 46static __always_inline long stub_syscall3(long syscall, long arg1, long arg2,
 47					  long arg3)
 48{
 49	long ret;
 50
 51	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
 52			"c" (arg2), "d" (arg3)
 53			: "memory");
 54
 55	return ret;
 56}
 57
 58static __always_inline long stub_syscall4(long syscall, long arg1, long arg2,
 59					  long arg3, long arg4)
 60{
 61	long ret;
 62
 63	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
 64			"c" (arg2), "d" (arg3), "S" (arg4)
 65			: "memory");
 66
 67	return ret;
 68}
 69
 70static __always_inline long stub_syscall5(long syscall, long arg1, long arg2,
 71					  long arg3, long arg4, long arg5)
 72{
 73	long ret;
 74
 75	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
 76			"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5)
 77			: "memory");
 78
 79	return ret;
 80}
 81
 82static __always_inline void trap_myself(void)
 83{
 84	__asm("int3");
 85}
 86
 87static __always_inline void remap_stack_and_trap(void)
 88{
 89	__asm__ volatile (
 90		"movl %%esp,%%ebx ;"
 91		"andl %0,%%ebx ;"
 92		"movl %1,%%eax ;"
 93		"movl %%ebx,%%edi ; addl %2,%%edi ; movl (%%edi),%%edi ;"
 94		"movl %%ebx,%%ebp ; addl %3,%%ebp ; movl (%%ebp),%%ebp ;"
 95		"int $0x80 ;"
 96		"addl %4,%%ebx ; movl %%eax, (%%ebx) ;"
 97		"int $3"
 98		: :
 99		"g" (~(STUB_DATA_PAGES * UM_KERN_PAGE_SIZE - 1)),
100		"g" (STUB_MMAP_NR),
101		"g" (UML_STUB_FIELD_FD),
102		"g" (UML_STUB_FIELD_OFFSET),
103		"g" (UML_STUB_FIELD_CHILD_ERR),
104		"c" (STUB_DATA_PAGES * UM_KERN_PAGE_SIZE),
105		"d" (PROT_READ | PROT_WRITE),
106		"S" (MAP_FIXED | MAP_SHARED)
107		:
108		"memory");
109}
110
111static __always_inline void *get_stub_data(void)
112{
113	unsigned long ret;
114
115	asm volatile (
116		"movl %%esp,%0 ;"
117		"andl %1,%0"
118		: "=a" (ret)
119		: "g" (~(STUB_DATA_PAGES * UM_KERN_PAGE_SIZE - 1)));
120
121	return (void *)ret;
122}
123#endif