Cannot find entry symbol _start...

I'm using NASM. When I try to link the program (using this command "ld -s -o test test.o"), I get the below warning. As a result of that, when I run the progam it seg-faults. Does anyone have an idea what I'm screwing up?

Warning:

Code:

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ld: warning: cannot find entry symbol _start; not setting start address

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Code:

Code:

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; test.asm

; this is where the variables are stored.
SECTION .DATA
  hello:    db 'Hello world!',10
  helloLen:  equ $-hello

; the beginning of the executing code.
SECTION .TEXT
  GLOBAL _START

; this is a routine that will be called when the program starts running.
_START:

  ; Write 'Hello world!' to the screen
  mov eax, 4          ; 'write' system call
  mov ebx, 1          ; file descriptor 1 = screen
  mov ecx, hello      ; string to write
  mov edx, helloLen    ; length of string to write
  int 80h              ; call the kernel

  ; Terminate program
  mov eax, 1          ; 'exit' system call
  mov ebx, 0          ; exit with error code 0, we want to exit without any errors.
  int 80h              ; call the kernel

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are u using Linux or Windows?
This code is for Linux and will not run on Windows correctly.

Quote:

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Originally Posted by BytePtr

are u using Linux or Windows?
This code is for Linux and will not run on Windows correctly.

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Linux.

Ok, I got the answer from elsewhere. Apparently the tutorial that I was using had all of the symbols capitalized and the linker didn't like that, so I simply set everything back to lower-case letters and it did the trick.

I am suffering the same promble, and i do modify the symbols capital to be lower-case letters now.
But it still doesn't work. here is my code partly:

.global INT_Initialize
INT_Initialize:

# **************** Begin target specific code ****************

# Symbol used for Standard C Program entry

.global main
main:

# Symbol used for Debugger entry

.global _start
_start:

.if (ENABLE_LE_MODE==NU_TRUE)

# Ensure that start of initizliation code is in Big Endian format since
# PowerPC defaults to Big Endian mode during reset.

.endian big

.endif # (ENABLE_LE_MODE==NU_TRUE)

# Ensure r0 is 0.

addis r0,0,0x0000

and i get the error message :

powerpc-linux-ld -o mpc5248.elf \
--start-group N:/build/liba/*.a --end-group -e _start -static -Map mpc5
248.map -T link_ram.lcf
powerpc-linux-ld: warning: cannot find entry symbol _start; not setting start ad
dress
powerpc-linux-objcopy -Ruv --gap-fill=0x0 -N .initcode,.rtinfo,.ucode,.vectors,.
text,.data,.sdata,.sdata2 -O binary mpc5248.elf mpc5248.rom
powerpc-linux-objcopy: there are no sections to be copied!
make[1]: *** [all] Error 1
make[1]: Leaving directory `/cygdrive/n/main'
make: *** [all] Error 2

i use nm tool to view the symbol in the object file correct:
bash-3.00$ powerpc-linux-nm.exe Plus/Demo/od/int.o | grep -n start
149: U _ld_bss_start
151: U _ld_data_RAM_start
152: U _ld_data_ROM_start
153:00000100 N _start
bash-3.00$

Would somebody give me any advise?