| # ----------------------------------------------------------------------- |
| # |
| # 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 |
