os_kernel_lab/labcodes_answer/lab8_result/user/libs/initcode.S

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ArmAsm
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2014-08-20 15:42:20 +08:00
.text
.globl _start
_start:
# set ebp for backtrace
movl $0x0, %ebp
# load argc and argv
movl (%esp), %ebx
lea 0x4(%esp), %ecx
# move down the esp register
# since it may cause page fault in backtrace
subl $0x20, %esp
# save argc and argv on stack
pushl %ecx
pushl %ebx
# call user-program function
call umain
1: jmp 1b