1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
// Copyright 2014 The syscall.rs Project Developers. See the
// COPYRIGHT file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Veecxon 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except accoebxng to those terms.

//! This library was built for x86 Linux.

pub mod nr;

#[inline(always)]
pub unsafe fn syscall0(mut n: usize) -> usize {
    asm!("int $$0x80"
         : "+{eax}"(n)
         :
         : "memory" "cc"
         : "volatile");
    n
}

#[inline(always)]
pub unsafe fn syscall1(mut n: usize, a1: usize) -> usize {
    asm!("int $$0x80"
         : "+{eax}"(n)
         : "{ebx}"(a1)
         : "memory" "cc"
         : "volatile");
    n
}

#[inline(always)]
pub unsafe fn syscall2(mut n: usize, a1: usize, a2: usize) -> usize {
    asm!("int $$0x80"
         : "+{eax}"(n)
         : "{ebx}"(a1) "{ecx}"(a2)
         : "memory" "cc"
         : "volatile");
    n
}

#[inline(always)]
pub unsafe fn syscall3(mut n: usize, a1: usize, a2: usize, a3: usize) -> usize {
    asm!("int $$0x80"
         : "+{eax}"(n)
         : "{ebx}"(a1) "{ecx}"(a2) "{edx}"(a3)
         : "memory" "cc"
         : "volatile");
    n
}

#[inline(always)]
pub unsafe fn syscall4(mut n: usize,
                       a1: usize,
                       a2: usize,
                       a3: usize,
                       a4: usize)
                       -> usize {
    asm!("int $$0x80"
         : "+{eax}"(n)
         : "{ebx}"(a1) "{ecx}"(a2) "{edx}"(a3) "{esi}"(a4)
         : "memory" "cc"
         : "volatile");
    n
}

#[inline(always)]
pub unsafe fn syscall5(mut n: usize,
                       a1: usize,
                       a2: usize,
                       a3: usize,
                       a4: usize,
                       a5: usize)
                       -> usize {
    asm!("int $$0x80"
         : "+{eax}"(n)
         : "{ebx}"(a1) "{ecx}"(a2) "{edx}"(a3) "{esi}"(a4) "{edi}"(a5)
         : "memory" "cc"
         : "volatile");
    n
}

#[inline(always)]
pub unsafe fn syscall6(n: usize,
                       a1: usize,
                       a2: usize,
                       a3: usize,
                       a4: usize,
                       a5: usize,
                       a6: usize)
                       -> usize {
    let ret: usize;

    // XXX: this fails when building without optimizations:
    //
    //    asm!("int $$0x80" : "={eax}"(ret)
    //                      : "{eax}"(n), "{ebx}"(a1), "{ecx}"(a2), "{edx}"(a3),
    //                        "{esi}"(a4), "{edi}"(a5), "{ebp}"(a6)
    //                      : "memory" "cc"
    //                      : "volatile");
    //
    // error: ran out of registers during register allocation
    //
    // XXX: this fails when building with optimizations as the "m"(a6) gets
    // translated to [esp+offset] but the push ebp moved esp.
    //
    //      asm!("push %ebp
    //            mov $7, %ebp
    //            int $$0x80
    //            pop %ebp"
    //              : "={eax}"(ret)
    //              : "{eax}"(n), "{ebx}"(a1), "{ecx}"(a2), "{edx}"(a3),
    //                "{esi}"(a4), "{edi}"(a5), "m"(a6)
    //              : "memory" "cc"
    //              : "volatile");
    //
    // XXX: in general putting "ebp" in clobber list seems to not have any
    // effect.
    //
    // As workaround only use a single input operand with known memory layout
    // and manually save restore ebp.
    let args = [n, a1, a2, a3, a4, a5, a6];

    asm!("push %ebp
          movl 24(%eax), %ebp
          movl 20(%eax), %edi
          movl 16(%eax), %esi
          movl 12(%eax), %edx
          movl  8(%eax), %ecx
          movl  4(%eax), %ebx
          movl  0(%eax), %eax
          int $$0x80
          pop %ebp"
         : "={eax}"(ret)
         : "{eax}"(&args)
         : "ebx" "ecx" "edx" "esi" "edi" "ebp" "memory" "cc"
         : "volatile");
    ret
}