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Re: [PATCH v2] ARM: Add SystemTap probes to longjmp and setjmp.
- From: Andreas Schwab <schwab at linux-m68k dot org>
- To: Will Newton <will dot newton at linaro dot org>
- Cc: Roland McGrath <roland at hack dot frob dot com>, "libc-ports\ at sourceware dot org" <libc-ports at sourceware dot org>, Patch Tracking <patches at linaro dot org>
- Date: Fri, 07 Feb 2014 15:16:04 +0100
- Subject: Re: [PATCH v2] ARM: Add SystemTap probes to longjmp and setjmp.
- Authentication-results: sourceware.org; auth=none
- References: <1391594162-22269-1-git-send-email-will dot newton at linaro dot org> <20140206221127 dot 6E28974443 at topped-with-meat dot com> <CANu=DmjAG8zxFOwWeJZuEFLXEcSTROVZsR1oRZc9qx=Zcn9T-w at mail dot gmail dot com>
Will Newton <will.newton@linaro.org> writes:
> In order to have the correct registers live I need to free up a temp
> register which involves loading lr and sp earlier than the
> call-preserved register set. I could do this by offsetting into the
> jmpbuf but it seems more natural just to move lr and sp to the front
> of the jmp_buf and load registers in ascending order. As far as I am
> aware the layout of jmp_buf is completely opaque so I don't see why
> this would cause any problems?
According to ports/sysdeps/arm/bits/setjmp.h the layout of jmp_buf is
part of the ABI.
Andreas.
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Andreas Schwab, schwab@linux-m68k.org
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