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 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_and_trap(void)
 81{
 82	__asm__ volatile (
 83		"movl %%esp,%%ebx ;"
 84		"andl %0,%%ebx ;"
 85		"movl %1,%%eax ;"
 86		"movl %%ebx,%%edi ; addl %2,%%edi ; movl (%%edi),%%edi ;"
 87		"movl %%ebx,%%ebp ; addl %3,%%ebp ; movl (%%ebp),%%ebp ;"
 88		"int $0x80 ;"
 89		"addl %4,%%ebx ; movl %%eax, (%%ebx) ;"
 90		"int $3"
 91		: :
 92		"g" (~(UM_KERN_PAGE_SIZE - 1)),
 93		"g" (STUB_MMAP_NR),
 94		"g" (UML_STUB_FIELD_FD),
 95		"g" (UML_STUB_FIELD_OFFSET),
 96		"g" (UML_STUB_FIELD_CHILD_ERR),
 97		"c" (UM_KERN_PAGE_SIZE),
 98		"d" (PROT_READ | PROT_WRITE),
 99		"S" (MAP_FIXED | MAP_SHARED)
100		:
101		"memory");
102}
103
104static __always_inline void *get_stub_page(void)
105{
106	unsigned long ret;
107
108	asm volatile (
109		"movl %%esp,%0 ;"
110		"andl %1,%0"
111		: "=a" (ret)
112		: "g" (~(UM_KERN_PAGE_SIZE - 1)));
113
114	return (void *)ret;
115}
116#endif