diff options
Diffstat (limited to 'sysdeps/unix/sysv/i386/linux/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/i386/linux/sysdep.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/i386/linux/sysdep.h b/sysdeps/unix/sysv/i386/linux/sysdep.h new file mode 100644 index 0000000000..298a0e4c5b --- /dev/null +++ b/sysdeps/unix/sysv/i386/linux/sysdep.h @@ -0,0 +1,57 @@ +/* Copyright (C) 1992, 1993 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <sysdeps/unix/sysdep.h> + +#define ENTRY(name) \ + .globl _##name; \ + .align 2; \ + _##name##: + +#define PSEUDO(name, syscall_name, args) \ + .text; \ + .globl syscall_error; \ + ENTRY (name) \ + XCHG_##args + movl $SYS_##syscall_name, %eax; \ + int $0x80; \ + test %eax, %eax; \ + jl syscall_error; \ + XCHG_##args + +/* Linux takes system call arguments in registers: + 1: %ebx + 2: %ecx + 3: %edx + 4: %esi + 5: %edi + We put the arguments into registers from the stack, + and save the registers, by using the 386 `xchg' instruction + to swap the values in both directions. */ + +#define XCHG_0 /* No arguments to frob. */ +#define XCHG_1 xchg 8(%esp), %ebx; XCHG_0 +#define XCHG_2 xchg 12(%esp), %ecx; XCHG_1 +#define XCHG_3 xchg 16(%esp), %edx; XCHG_2 +#define XCHG_4 xchg 20(%esp), %esi; XCHG_3 +#define XCHG_5 xchg 24(%esp), %edi; XCHG_3 + +#define r0 %eax /* Normal return-value register. */ +#define r1 %edx /* Secondary return-value register. */ +#define scratch %ecx /* Call-clobbered register for random use. */ +#define MOVE(x,y) movl x, y |