Re: GAS-Intel on Windows (MinGW)

On Feb 11, 5:15 pm, yaugin <spamt...@xxxxxxxxxx> wrote:
Hello all, I am trying to get the hang of using GAS Intel syntax on
Windows, via the MinGW ports of as and ld. The following is an attempt
at a Hello World on the Windows console. It assembles, links, and runs
without error, but doesn't do anything (no Hello World output).

.intel_syntax noprefix
.global start

.section .text
start:
.extern _GetStdHandle@4 # to use the console
push -11 # STD_OUTPUT_HANDLE
call _GetStdHandle@4 # put handle in EAX
.extern _WriteConsoleA@20 # to print text
push 0 # lpReserved = NULL
push written # nNumberOfCharsWritten (ptr)
push 11 # nNumberOfCharsToWrite = 11
push buffer # lpBuffer (ptr)
push eax # handle from GetStdHandle
call _WriteConsoleA@20
.extern _ExitProcess@4
push 0
call _ExitProcess@4

.section .data
buffer: .asciz "Hello World"

.section .bss
.lcomm written, 4 # reserve 4 bytes

This was converted from a working NASM program:

global start

segment .text
start:
extern _GetStdHandle@4 ; to use the console
push -11 ; STD_OUTPUT_HANDLE
call _GetStdHandle@4 ; put handle in EAX
extern _WriteConsoleA@20 ; to print text
push 0 ; lpReserved = NULL
push written ; nNumberOfCharsWritten (ptr)
push 11 ; nNumberOfCharsToWrite = 11
push buffer ; lpBuffer (ptr)
push eax ; handle from GetStdHandle
call _WriteConsoleA@20
extern _ExitProcess@4
push 0
call _ExitProcess@4

segment .data
buffer dd 'Hello World'

segment .bss
written resd 1 ; reserve a double


Use your editor's *Search and Replace* feature to change
"WriteConsole" to "WriteFile" throughout the entire source.

Nathan.

.