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 <sys/mman.h>
10#include <asm/ptrace.h>
11#include <asm/unistd.h>
12#include <asm/page.h>
13#include "stub-data.h"
14#include "kern_constants.h"
15#include "uml-config.h"
16
17extern void stub_segv_handler(int sig);
18extern void stub_clone_handler(void);
19
20#define STUB_SYSCALL_RET EAX
21#define STUB_MMAP_NR __NR_mmap2
22#define MMAP_OFFSET(o) ((o) >> PAGE_SHIFT)
23
24static inline long stub_syscall0(long syscall)
25{
26	long ret;
27
28	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall));
29
30	return ret;
31}
32
33static inline long stub_syscall1(long syscall, long arg1)
34{
35	long ret;
36
37	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1));
38
39	return ret;
40}
41
42static inline long stub_syscall2(long syscall, long arg1, long arg2)
43{
44	long ret;
45
46	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
47			"c" (arg2));
48
49	return ret;
50}
51
52static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
53{
54	long ret;
55
56	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
57			"c" (arg2), "d" (arg3));
58
59	return ret;
60}
61
62static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
63				 long arg4)
64{
65	long ret;
66
67	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
68			"c" (arg2), "d" (arg3), "S" (arg4));
69
70	return ret;
71}
72
73static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
74				 long arg4, long arg5)
75{
76	long ret;
77
78	__asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
79			"c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5));
80
81	return ret;
82}
83
84static inline void trap_myself(void)
85{
86	__asm("int3");
87}
88
89static inline void remap_stack(int fd, unsigned long offset)
90{
91	__asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;"
92			  "movl %7, %%ebx ; movl %%eax, (%%ebx)"
93			  : : "g" (STUB_MMAP_NR), "b" (UML_CONFIG_STUB_DATA),
94			    "c" (UM_KERN_PAGE_SIZE),
95			    "d" (PROT_READ | PROT_WRITE),
96			    "S" (MAP_FIXED | MAP_SHARED), "D" (fd),
97			    "a" (offset),
98			    "i" (&((struct stub_data *) UML_CONFIG_STUB_DATA)->err)
99			  : "memory");
100}
101
102#endif
103