linux-syscalls 0.4.0

A library to easily invoke linux system calls.
Documentation 
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

# Syscall registers
# +-------+------+------+------+------+------+------+--------+
# | sysno | arg0 | arg1 | arg2 | arg3 | arg4 | arg5 | return |
# +-------+------+------+------+------+------+------+--------+
# |  $a7  | $a0  | $a1  | $a2  | $a3  | $a4  | $a5  |  $a0   |
# +-------+------+------+------+------+------+------+--------+
#
# sysv calling convention
# +----------+----------------------------------------+-------------------+
# |  return  |                 params                 | additional params |
# +----------+----------------------------------------+-------------------+
# |   $a0    | $a0, $a1, $a2, $a3, $a4, $a5, $a6, $a7 |    stack RTL      |
# +----------+----------------------------------------+-------------------+
#
# Registers are the same, we just need to copy last argument (sysno) in a7.

  .globl linux_syscalls_rs_syscall0
linux_syscalls_rs_syscall0:
  move    $a7, $a0
  syscall 0
  ret

  .globl linux_syscalls_rs_syscall1
linux_syscalls_rs_syscall1:
  move    $a7, $a1
  syscall 0
  ret

  .globl linux_syscalls_rs_syscall1_noreturn
linux_syscalls_rs_syscall1_noreturn:
  move    $a7, $a1
  syscall 0
  break   1

  .globl linux_syscalls_rs_syscall2
linux_syscalls_rs_syscall2:
  move    $a7, $a2
  syscall 0
  ret

  .globl linux_syscalls_rs_syscall3
linux_syscalls_rs_syscall3:
  move    $a7, $a3
  syscall 0
  ret

  .globl linux_syscalls_rs_syscall4
linux_syscalls_rs_syscall4:
  move    $a7, $a4
  syscall 0
  ret

  .globl linux_syscalls_rs_syscall5
linux_syscalls_rs_syscall5:
  move    $a7, $a5
  syscall 0
  ret

  .globl linux_syscalls_rs_syscall6
linux_syscalls_rs_syscall6:
  move    $a7, $a6
  syscall 0
  ret