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POWeird linker error gcc when following simple kernel tutorial
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  1. POWeird linker error gcc when following simple kernel tutorial
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    copied!<p>Im following this tutorial on how to make a simple bootable kernel: <a href="http://www.osdever.net/tutorials/view/writing-a-simple-c-kernel" rel="nofollow">http://www.osdever.net/tutorials/view/writing-a-simple-c-kernel</a></p> <p>there are the following required files in the tutorial:</p> <p>kernel.c source code:</p> <pre><code>#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 &lt; (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); }; </code></pre> <p>kernel_start.asm source code: </p> <pre><code>[BITS 32] [global start] [extern _k_main] ; this is in the c file start: call _k_main cli ; stop interrupts hlt ; halt the CPU </code></pre> <p>link.ld source code:</p> <pre><code>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 = .; } </code></pre> <p>The instructions to compile it are:</p> <pre><code>nasm -f aout kernel_start.asm -o ks.o gcc -c kernel.c -o kernel.o ld -T link.ld -o kernel.bin ks.o kernel.o </code></pre> <p>i am able to successfully execute the first two lines:</p> <pre><code>nasm -f aout kernel_start.asm -o ks.o gcc -c kernel.c -o kernel.o </code></pre> <p>then when i try and run this line :</p> <pre><code>ld -T link.ld -o kernel.bin ks.o kernel.o </code></pre> <p>I get the error:</p> <pre><code>C:\basic_kernel&gt;ld -T link.ld -o kernel.bin ks.o kernel.o ks.o: file not recognized: File format not recognized </code></pre> <p>Does anyone know why this is and how I could fix this? I'm using windows 7 64 bit</p>
 

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