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Re: Building for cortex-m3

From: Richard Earnshaw <rearnsha at arm dot com>
To: Simon Wright <simon at pushface dot org>
Cc: Jon Beniston <jon at beniston dot com>, newlib at sourceware dot org
Date: Mon, 18 Apr 2011 14:11:02 +0100
Subject: Re: Building for cortex-m3
References: <11A32281-D4EB-4089-AA6C-979348C4865A@pushface.org> <000201cbfd4a$42dcb980$c8962c80$@beniston.com> <B9A54A82-F10F-4A92-9AD0-9D1741D841F7@pushface.org>

On Mon, 2011-04-18 at 01:52 +0100, Simon Wright wrote:
> Jon suggested I rebuild newlib with GCC. I withdraw my remarks about multilib and crt0.o (which may have been down to leaving -mthumb out of the ld command) but crt0.o is still miscompiled: objdump -D says
> 
> $ arm-none-eabi-objdump -D crt0.o
> 
> crt0.o:     file format elf32-littlearm
> 
> Disassembly of section .text:
> 
> 00000000 <_mainCRTStartup>:
>    0:   e59f30d0        ldr     r3, [pc, #208]  ; d8 <change_back+0x8>
>    4:   e3530000        cmp     r3, #0
> ....
> 
> which is ARM code, isn't it?

Yes, that's ARM code.  Newlib hasn't been ported to v6-M and v7-M (ie
Cortex-M) yet.

R.

Follow-Ups:
- Re: Building for cortex-m3
  - From: Pavel Pisa

References:
- Building for cortex-m3
  - From: Simon Wright
- Re: Building for cortex-m3
  - From: Simon Wright

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