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 <stddef.h>
10 #include <sysdep/ptrace_user.h>
11 #include <generated/asm-offsets.h>
12 #include <linux/stddef.h>
13
14 #define STUB_MMAP_NR __NR_mmap
15 #define MMAP_OFFSET(o) (o)
16
17 #define __syscall_clobber "r11","rcx","memory"
18 #define __syscall "syscall"
19
stub_syscall0(long syscall)20 static __always_inline long stub_syscall0(long syscall)
21 {
22 long ret;
23
24 __asm__ volatile (__syscall
25 : "=a" (ret)
26 : "0" (syscall) : __syscall_clobber );
27
28 return ret;
29 }
30
stub_syscall1(long syscall,long arg1)31 static __always_inline long stub_syscall1(long syscall, long arg1)
32 {
33 long ret;
34
35 __asm__ volatile (__syscall
36 : "=a" (ret)
37 : "0" (syscall), "D" (arg1) : __syscall_clobber );
38
39 return ret;
40 }
41
stub_syscall2(long syscall,long arg1,long arg2)42 static __always_inline long stub_syscall2(long syscall, long arg1, long arg2)
43 {
44 long ret;
45
46 __asm__ volatile (__syscall
47 : "=a" (ret)
48 : "0" (syscall), "D" (arg1), "S" (arg2) : __syscall_clobber );
49
50 return ret;
51 }
52
stub_syscall3(long syscall,long arg1,long arg2,long arg3)53 static __always_inline long stub_syscall3(long syscall, long arg1, long arg2,
54 long arg3)
55 {
56 long ret;
57
58 __asm__ volatile (__syscall
59 : "=a" (ret)
60 : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3)
61 : __syscall_clobber );
62
63 return ret;
64 }
65
stub_syscall4(long syscall,long arg1,long arg2,long arg3,long arg4)66 static __always_inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
67 long arg4)
68 {
69 long ret;
70
71 __asm__ volatile ("movq %5,%%r10 ; " __syscall
72 : "=a" (ret)
73 : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
74 "g" (arg4)
75 : __syscall_clobber, "r10" );
76
77 return ret;
78 }
79
stub_syscall5(long syscall,long arg1,long arg2,long arg3,long arg4,long arg5)80 static __always_inline long stub_syscall5(long syscall, long arg1, long arg2,
81 long arg3, long arg4, long arg5)
82 {
83 long ret;
84
85 __asm__ volatile ("movq %5,%%r10 ; movq %6,%%r8 ; " __syscall
86 : "=a" (ret)
87 : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
88 "g" (arg4), "g" (arg5)
89 : __syscall_clobber, "r10", "r8" );
90
91 return ret;
92 }
93
stub_syscall6(long syscall,long arg1,long arg2,long arg3,long arg4,long arg5,long arg6)94 static __always_inline long stub_syscall6(long syscall, long arg1, long arg2,
95 long arg3, long arg4, long arg5,
96 long arg6)
97 {
98 long ret;
99
100 __asm__ volatile ("movq %5,%%r10 ; movq %6,%%r8 ; movq %7,%%r9 ; "
101 __syscall
102 : "=a" (ret)
103 : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
104 "g" (arg4), "g" (arg5), "g" (arg6)
105 : __syscall_clobber, "r10", "r8", "r9");
106
107 return ret;
108 }
109
trap_myself(void)110 static __always_inline void trap_myself(void)
111 {
112 __asm("int3");
113 }
114
get_stub_data(void)115 static __always_inline void *get_stub_data(void)
116 {
117 unsigned long ret;
118
119 asm volatile (
120 "lea 0(%%rip), %0;"
121 "andq %1, %0 ;"
122 "addq %2, %0 ;"
123 : "=a" (ret)
124 : "g" (~(UM_KERN_PAGE_SIZE - 1)),
125 "g" (UM_KERN_PAGE_SIZE));
126
127 return (void *)ret;
128 }
129
130 #define stub_start(fn) \
131 asm volatile ( \
132 "subq %0,%%rsp ;" \
133 "movq %1,%%rax ;" \
134 "call *%%rax ;" \
135 :: "i" ((1 + STUB_DATA_PAGES) * UM_KERN_PAGE_SIZE), \
136 "i" (&fn))
137 #endif
138