about execute assembly exapmles under freebsd
From: HHCHANG (b8701143_at_tmu.edu.tw)
Date: 04/24/05
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To: <freebsd-hackers@freebsd.org> Date: Sun, 24 Apr 2005 16:15:12 +0800
Hi,
I couldn't execute assembly example under freebsd .
The environment and tools I used were (in IBM X31 box):
1.
bash-2.05b# uname -a
FreeBSD sexbear.localhost 5.3-STABLE FreeBSD 5.3-STABLE #3: Sun Feb 20 21:55:06 UTC 2005 ?root@sexbear.localhost:/usr/obj/usr/src/sys/SEXBEAR??i386
2.
bash-2.05b# as -v
GNU assembler version 2.15 [FreeBSD] 2004-05-23 (i386-obrien-freebsd) using BFD version 2.15 [FreeBSD] 2004-05-23
bash-2.05b# ld -v
GNU ld version 2.15 [FreeBSD] 2004-05-23
3.(compile and execute the example)
bash-2.05b#
as -gstabs -o cpuid.o cpuid.s
ld -o cpuid cpuid.o
cpuid (no output after executing the program)
gdb cpuid
(gdb) run
Starting program: /usr/local/src/code/chap04/cpuid
Program exited with code 0340.
(gdb) break *_start
(gdb) run
Program exited with code 0340.
###################example in book###################################
#cpuid.s Sample program to extract the processor Vendor ID
.section .data
output:
.ascii "The processor Vendor ID is 'xxxxxxxxxxxx'\n"
.section .text
.globl _start
_start:
movl $0, %eax
cpuid
movl $output, %edi
movl %ebx, 28(%edi)
movl %edx, 32(%edi)
movl %ecx, 36(%edi)
movl $4, %eax
movl $1, %ebx
movl $output, %ecx
movl $42, %edx
int $0x80
movl $1,
%eax
movl $0, %ebx
int $0x80
###################example in book###################################
I viewed the tutorial: http://www.int80h.org/bsdasm/.
but I couldn't find any syntax error in the program.
Could someone give me a hint where I could find the more information?
Thanks~
Regards,
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