[9fans] Hello Assembly

[Anant Narayanan <anant@kix.in>]

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Hi,

I'm trying to make a Hello World program in assembly without depending
on libc. Here's what I have so far:

DATA	string+0(SB)/7, $"Hello\n\z"
GLOBL	string+0(SB), $7

TEXT	_main+0(SB), 1, $0

// first arg; $1 = stdout
MOVL	$1, (SP)
// second arg, address of string
MOVL	$string+0(SB), 4(SP)
// third arg, $7 = length of string
MOVL	$7, 8(SP)
// fourth argument, -1LL (vlong offset)
MOVL	$-1, 12(SP)
MOVL	$-1, 16(SP)

// use pwrite syscall
MOVL	$51, AX
INT	$64
RET

The program assembles and links fine - but executing it gives me:

8.out 1183: suicide: invalid address 0x7 in sys call pc=0x104e

It's probably something silly - I'll be extremely grateful if someone
could point out what I'm doing wrong.

Thanks!

--
Anant

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