0,0 → 1,56 |
# |
# Copyright (c) 2007 Jakub Jermar |
# All rights reserved. |
# |
# Redistribution and use in source and binary forms, with or without |
# modification, are permitted provided that the following conditions |
# are met: |
# |
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# - Redistributions in binary form must reproduce the above copyright |
# notice, this list of conditions and the following disclaimer in the |
# documentation and/or other materials provided with the distribution. |
# - The name of the author may not be used to endorse or promote products |
# derived from this software without specific prior written permission. |
# |
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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.text |
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/** Syscall wrapper. |
* |
* Mind the order of arguments. First two arguments and the syscall number go to |
* scratch registers. An optimized version of this wrapper for fewer arguments |
* could benefit from this and not save unused registers on the stack. |
*/ |
.global __syscall |
__syscall: |
pushl %ebx |
pushl %esi |
pushl %edi |
pushl %ebp |
movl 20(%esp), %edx # First argument. |
movl 24(%esp), %ecx # Second argument. |
movl 28(%esp), %ebx # Third argument. |
movl 32(%esp), %esi # Fourth argument. |
movl 36(%esp), %edi # Fifth argument. |
movl 40(%esp), %ebp # Sixth argument. |
movl 44(%esp), %eax # Syscall number. |
int $0x30 |
popl %ebp |
popl %edi |
popl %esi |
popl %ebx |
ret |
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