[PATCH 6/6] reliable stack trace support (i386 entry.S annotations)

Andrew Morton akpm at osdl.org
Thu May 25 07:41:59 CEST 2006


Andrew Morton <akpm at osdl.org> wrote:
>
> "Jan Beulich" <jbeulich at novell.com> wrote:
>  >
>  >  #define SAVE_ALL \
>  >   	cld; \
>  >   	pushl %es; \
>  >  +	CFI_ADJUST_CFA_OFFSET 4;\
>  >  +	/*CFI_REL_OFFSET es, 0;*/\
>  >   	pushl %ds; \
> 
>  arch/i386/kernel/entry.S: Assembler messages:
>  arch/i386/kernel/entry.S:757: Error: CFI instruction used without previous .cfi_startproc
>  arch/i386/kernel/entry.S:757: Warning: rest of line ignored; first ignored character is `4'
>  arch/i386/kernel/entry.S:757: Error: CFI instruction used without previous .cfi_startproc
>  arch/i386/kernel/entry.S:757: Warning: rest of line ignored; first ignored character is `4'
>  arch/i386/kernel/entry.S:757: Error: CFI instruction used without previous .cfi_startproc
>  arch/i386/kernel/entry.S:757: Warning: rest of line ignored; first ignored character is `4'
>  arch/i386/kernel/entry.S:757: Error: CFI instruction used without previous .cfi_startproc
> 
>  etcetera.  And
> 
>  arch/i386/kernel/entry.S:757: Error: no such instruction: `eax,0'
>  arch/i386/kernel/entry.S:757: Error: no such instruction: `ebp,0'
> 

btw, this cfi annotation code:

ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.17-rc4/2.6.17-rc4-mm3/broken-out/kgdb-cfi_annotations.patch

compiles happily with that toolchain.




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