GNU Arm Embedded Toolchain

cortex-m0 objdump

Asked by bluesnail1986

Hi
I compiled&linked an elf file successfully by arm-none-eabi-gcc for cortex-m0, but I find .s file is weird after using arm-none-eabi-objdump. Some strange assembly instructions show up, .e.g. svcge/subscs/andeq. I can't figure out why this happen. Is there any possibility that I used wrong compile/link/objdump options? Thanks.

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Thomas Preud'homme (thomas-preudhomme) said : 		#1

Hi,

"ge", "cs" and "eq" at the end of "svc", "subs" and "and" respectively are condition upon which the instruction are executed. See section A6.2 "Standard assembler syntax fields" on field <c> and related section A4.1.2 "Conditional execution" of the ARMv6-M Architecture Reference Manual available on ARM website [1].

[1] http://infocenter.arm.com/help/index.jsp in section ARM Architecture > Reference Manuals > ARMv6-M Reference Manual.

Best regards.

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bluesnail1986 (cat-butterfly8689) said : 		#2

Hi Thomas:
Thanks for your immediate response. What I reported happened under Ubuntu, but now objdump seems working OK under Windows. I will try to find the difference between the two environments, and the linkage you provided will be a good reference for me. Perhaps I will bother you later. Thanks again for your help.