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POCompiling and Running ARM Assembly thumb-2 in Rasperry pi?
 

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  1. POCompiling and Running ARM Assembly thumb-2 in Rasperry pi?
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    <p>I am taking an assembly class and turns out i can't run the Assembly program they gave, due to being Windows 95 compliant x.x </p> <p>I am running Rasperry PI and can easily run the Assembly for ARM code via </p> <p><a href="http://thinkingeek.com/2013/01/09/arm-assembler-raspberry-pi-chapter-1/" rel="nofollow">http://thinkingeek.com/2013/01/09/arm-assembler-raspberry-pi-chapter-1/</a></p> <pre><code>/* -- first.s */ /* This is a comment */ .global main /* 'main' is our entry point and must be global */ .func main /* 'main' is a function */ main: /* This is main */ mov r0, #2 /* Put a 2 inside the register r0 */ bx lr /* Return from main */ $ as -o first.o first.s $ gcc -o first first.o $ ./first ; echo $? 2 </code></pre> <p>But this is the standard ARM 32 bit setup and need to compile and run for a thumb-2 setup for example:</p> <pre><code> AREA PrintText, CODE, READONLY SWI_WriteC EQU &amp;0 ;output character in r0 SWI_Exit EQU &amp;11 ;finish program ENTRY BL Print ;call print subroutine = "Text to print",&amp;0a,&amp;0d,0 ALIGN SWI SWI_Exit ;finish Print LDRB r0,[r14], #1 ;get a character CMP r0, #0 ;end mark NUL? SWINE SWI_WriteC ;if not, print BNE Print ADD r14, r14, #3 ; pass next word boundary BIC r14, r14, #3 ; round back to boundary MOV pc, r14 ;return END </code></pre> <p>Does anyone know what I need to in Pi to run this thumb style ? EDIT:</p> <p>for the commands above I tried adding -mthumb but dont think its right as i dont see any changes. </p> <p>as -mthumb -o test.o test.s </p>
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    1. COThe raspberry pi is an arm11 (ARMv6somethingjsomething). It does not support thumb-2 extensions only thumb.
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    2. COI am not sure if it's just thumb or thumb-2 i am needing, the idea is its just 16 registers 1 being the PC. is that just thumb?
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    3. COI would try Seva's answer if it is just thumb, that is not how I do it but it seems plausible...github.com/dwelch67/raspberrypi I am sure I have some thumb examples there if you want to use .thumb and .thumb_func with the gnu tools.
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