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asm volatile compile problem https://forum.osdev.org/viewtopic.php?f=8&t=30038 |
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Author: | art6050 [ Mon Feb 01, 2016 4:06 pm ] |
Post subject: | asm volatile compile problem |
Hi, According to http://wiki.osdev.org/Raspberry_Pi_Bare_Bones tutorial, I did the steps until linking the kernel. I get this error: Code: alireza@alireza-VirtualBox:~/Downloads$ arm-none-eabi-gcc -T linker.ld -o myos.elf -ffreestanding -O2 -nostdlib boot.o kernel.o /home/alireza/opt/cross/lib/gcc/arm-none-eabi/4.9.2/../../../../arm-none-eabi/bin/ld:linker.ld:1: ignoring invalid character `#' in expression /home/alireza/opt/cross/lib/gcc/arm-none-eabi/4.9.2/../../../../arm-none-eabi/bin/ld:linker.ld:1: syntax error collect2: error: ld returned 1 exit status I invested the .c code mentioned in the tutorial and tried to compile it with gcc with this command: Code: gcc kernel.c but it was not compiled: Code: kernel.c: Assembler messages: kernel.c:22: Error: expecting operand after ','; got nothing line 22 is : Code: asm volatile("__delay_%=: subs %[count], %[count], #1; bne __delay_%=\n": : [count]"r"(count) :"cc"); Would you please tell me how I can solve the problem? |
Author: | thepowersgang [ Mon Feb 01, 2016 11:14 pm ] |
Post subject: | Re: asm volatile compile problem |
1. Where's the # in that linker script coming from? (The wiki page doesn't have one) 2. Compiling ARM code using your system gcc won't work (your system gcc probably targets x86_64, which has a different assembler syntax). |
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