X-Authentication-Warning: delorie.com: mail set sender to djgpp-bounces using -f
Newsgroups: comp.os.msdos.djgpp
Subject: Help: PE operations on a non PE file.
From: Tom Junior <tbjnospam AT automateddesign DOT com>
Organization: Automated Design Corporation
Content-Type: text/plain; format=flowed; charset=iso-8859-15
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Message-ID: <opr8cwvyku6fmpzp@news.east.earthlink.net>
User-Agent: Opera7.21/Win32 M2 build 3218
Lines: 159
Date: Fri, 21 May 2004 15:48:31 GMT
NNTP-Posting-Host: 66.82.112.1
X-Complaints-To: abuse AT earthlink DOT net
X-Trace: newsread2.news.atl.earthlink.net 1085154511 66.82.112.1 (Fri, 21 May 2004 08:48:31 PDT)
NNTP-Posting-Date: Fri, 21 May 2004 08:48:31 PDT
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi!

I'm running Windows 2000 Pro and using the latest version of DJGPP.

All I'm trying to do is compile and link a simple kernel example so I can 
burn it to a floppy.

It involves 3 files:
kernel.c
kernel_start.asm
link.ld

Everything compiles fine using the following:
nasmw -f coff kernel_start.asm - o ks.o
gcc -c kernel.c -o kernel.o

Then I try to do the linking:
ld -T link.ld -o kernel.bin ks.o kernel.o

Result:
ld: PE operations on non PE file

Here's the linker file:
OUTPUT_FORMAT("binary")
ENTRY(start)
SECTIONS
{
   .text  0x100000 : {
     code = .; _code = .; __code = .;
     *(.text)
     . = ALIGN(4096);
   }
   .data  : {
     data = .; _data = .; __data = .;
     *(.data)
     . = ALIGN(4096);
   }
   .bss  :
   {
     bss = .; _bss = .; __bss = .;
     *(.bss)
     . = ALIGN(4096);
   }
   end = .; _end = .; __end = .;
}


Can someone please explain the error and how I can get these two files to 
link?

Note: Compiling the assembly file to a.out format instead of coff does not 
work, and gives me the error Invalid file format.

Thanks in advance,
Tom

The rest of the code:

kernel.c:
//////////////////////////////////////////////
// This code was made for the tutorial:
// "Making a Simple C kernel with Basic printf and clearscreen Functions"
//
// This code comes with absolutly
// NO WARRANTY
// you can not hold me(KJ), nor
// anyone else responsible for what
// this code does.
//
// This code is in the public domain,
// you may use it however you want
//////////////////////////////////////////////


#define WHITE_TXT 0x07 // white on black text

void k_clear_screen();
unsigned int k_printf(char *message, unsigned int line);


k_main() // like main in a normal C program
{
	k_clear_screen();
	k_printf("Hi!\nHow's this for a starter OS?", 0);
};

void k_clear_screen() // clear the entire text screen
{
	char *vidmem = (char *) 0xb8000;
	unsigned int i=0;
	while(i < (80*25*2))
	{
		vidmem[i]=' ';
		i++;
		vidmem[i]=WHITE_TXT;
		i++;
	};
};

unsigned int k_printf(char *message, unsigned int line) // the message and 
then the line #
{
	char *vidmem = (char *) 0xb8000;
	unsigned int i=0;

	i=(line*80*2);

	while(*message!=0)
	{
		if(*message=='\n') // check for a new line
		{
			line++;
			i=(line*80*2);
			*message++;
		} else {
			vidmem[i]=*message;
			*message++;
			i++;
			vidmem[i]=WHITE_TXT;
			i++;
		};
	};

	return(1);
};



kernel_start.asm:

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; This code was made for the tutorial:
;; "Making a Simple C kernel with Basic printf and clearscreen Functions"
;;
;; This code comes with absolutly
;; NO WARRANTY
;; you can not hold me(KJ), nor
;; anyone else responsible for what
;; this code does.
;;
;; This code is in the public domain,
;; you may use it however you want
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

[BITS 32]

[global start]
[extern _k_main] ; this is in the c file

start:
   call _k_main

   cli  ; stop interrupts
   hlt ; halt the CPU



-- 
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/