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