GAS LISTING /tmp/cccdHDJt.s 			page 1


   1              	# 1 "/var/www/html/boot/syslinux/dos/crt0.S"
   1              		.code16
   1              	...
   0              	
   0              	
   1              	/* Must be included first of all */
   2              	#ifdef __ASSEMBLY__
   3              		.code16
   4              	#else
   2              	
   3              	#ifndef REGPARM
   4              	# error "This file assumes -mregparm=3 -DREGPARM=3"
   5              	#endif
   6              	
   7              		.section ".text","ax"
   8              		.globl _start
   9              		.type _start,@function
  10              	_start:
  11              		# Align the stack and make sure the high half is zero
  12 0000 6681E4FC 		andl $0xfffc,%esp
  12      FF0000
  13              	
  14              		# DS, ES points to the PSP at this point
  15 0007 06       		pushw %es		# Save PSP pointer
  16 0008 8CC8     		movw %cs,%ax
  17 000a 8ED8     		movw %ax,%ds
  18 000c 8EC0     		movw %ax,%es
  19              	
  20              		# Clear the .bss
  21 000e FC       		cld
  22 000f 6631C0   		xorl %eax,%eax
  23 0012 BF0000   		movw $__bss_start,%di
  24 0015 B90300   		movw $__bss_end+3,%cx
  25 0018 29F9     		subw %di,%cx
  26 001a C1E902   		shrw $2,%cx
  27 001d F366AB   		rep ; stosl
  28              	
  29              		# Copy the PSP into our own segment
  30 0020 0FA1     		popw %fs		# FS -> PSP
  31 0022 BF0000   		movw $_PSP,%di
  32 0025 31F6     		xorw %si,%si
  33 0027 B94000   		movw $0x40,%cx
  34 002a 64F366A5 		fs ; rep ; movsl
  35              	
  36              		# Verify that this is a supportable DOS version
  37 002e B80130   		movw $0x3001,%ax
  38 0031 CD21     		int $0x21
  39 0033 86E0     		xchgb %ah,%al
  40 0035 A30000   		movw %ax,dos_version
  41 0038 3D1403   		cmpw $0x0314,%ax	# DOS >= 3.20?
  42 003b 7309     		jae 1f			# If so, okay
  43 003d BA0000   		movw $bad_dos,%dx	# Print error message
  44 0040 B409     		movb $0x09,%ah
  45 0042 CD21     		int $0x21
  46 0044 CD20     		int $0x20		# Die
  47              	
  48              	1:
GAS LISTING /tmp/cccdHDJt.s 			page 2


  49              		# Compute argc and argv (assumes REGPARM)
  50 0046 6650     		pushl %eax		# Make space for argv
  51 0048 6689E0   		movl %esp,%eax
  52 004b 66E8FCFF 		calll __parse_argv
  52      FFFF
  53 0051 6650     		pushl %eax		# argc
  54              	
  55              		# Initialize malloc
  56 0053 66E8FCFF 		calll __init_memory_arena
  56      FFFF
  57              	
  58              		# Now call main
  59 0059 6658     		popl %eax		# argc
  60 005b 665A     		popl %edx		# argv
  61 005d 66E8FCFF 		calll main
  61      FFFF
  62              	
  63              		# Here %eax is the exit code, fall through into exit
  64              	
  65              		.size _start,.-_start
  66              	
  67              		.globl exit
  68              		.type exit,@function
  69              	exit:
  70              		# Exit code already in %eax
  71 0063 B44C     		movb $0x4c,%ah		# Terminate program
  72 0065 CD21     		int $0x21
  73 0067 F4       	1:	hlt
  74 0068 EBFD     		jmp 1b
  75              		.size exit,.-exit
  76              	
  77              		.section ".rodata","a"
  78              	bad_dos:
  79 0000 556E7375 		.ascii "Unsupported DOS version\r\n$"
  79      70706F72 
  79      74656420 
  79      444F5320 
  79      76657273 
  80              		.size bad_dos,.-bad_dos
  81              	
  82              		.section ".bss","aw"
  83              		.balign 16
  84              		.globl _PSP
  85              	_PSP:
  86 0000 00000000 		.space 256
  86      00000000 
  86      00000000 
  86      00000000 
  86      00000000 
  87              		.size _PSP, .-_PSP
  88              	
  89              		/* Purely for sanity */
  90              		.section ".null","a"
  91 0000 00000000 		.long 0,0,0,0
  91      00000000 
  91      00000000 
  91      00000000 
GAS LISTING /tmp/cccdHDJt.s 			page 3


GAS LISTING /tmp/cccdHDJt.s 			page 4


DEFINED SYMBOLS
/var/www/html/boot/syslinux/dos/crt0.S:10     .text:0000000000000000 _start
/var/www/html/boot/syslinux/dos/crt0.S:85     .bss:0000000000000000 _PSP
/var/www/html/boot/syslinux/dos/crt0.S:78     .rodata:0000000000000000 bad_dos
/var/www/html/boot/syslinux/dos/crt0.S:69     .text:0000000000000063 exit

UNDEFINED SYMBOLS
__bss_start
__bss_end
dos_version
__parse_argv
__init_memory_arena
main