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//proc/self/root/usr/share/doc/syslinux-4.02/sample/c32entry.S
# ----------------------------------------------------------------------- # # Copyright 2003-2008 H. Peter Anvin - All Rights Reserved # # Permission is hereby granted, free of charge, to any person # obtaining a copy of this software and associated documentation # files (the "Software"), to deal in the Software without # restriction, including without limitation the rights to use, # copy, modify, merge, publish, distribute, sublicense, and/or # sell copies of the Software, and to permit persons to whom # the Software is furnished to do so, subject to the following # conditions: # # The above copyright notice and this permission notice shall # be included in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES # OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT # HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR # OTHER DEALINGS IN THE SOFTWARE. # # ----------------------------------------------------------------------- # COM32 start up code - must be linked first in the binary .section ".text","ax" .globl _start _start: # This first instruction acts as COM32 magic number movl $0x21cd4cff,%eax # Upwards string operations cld # Zero the .bss segment xorl %eax,%eax movl $__bss_start,%edi # Symbol provided by linker movl $_end+3,%ecx # Symbol provided by linker subl %edi,%ecx shrl $2,%ecx rep ; stosl # Copy COM32 invocation parameters leal 4(%esp),%esi # Argument list movl $__com32,%edi movl $6,%ecx movl %esp,-4(%edi) # Save the initial stack ptr cmpl (%esi),%ecx jbe 1f movl (%esi),%ecx 1: rep ; movsl # Run program; we call this __start rather than main since we # did not parse the command line or anything like that. jmp __start .section ".bss","aw" .globl __entry_esp __entry_esp: .space 4 .globl __com32 __com32: .space 4*6