Date: Fri, 17 Aug 2001 15:54:26 -0700 (PDT) From: "David E. O'Brien" <obrien@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/contrib/gcc.295/config/alpha crtbegin.asm Message-ID: <200108172254.f7HMsQl43600@freefall.freebsd.org>
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obrien 2001/08/17 15:54:26 PDT
Modified files:
contrib/gcc.295/config/alpha crtbegin.asm
Log:
Re-initialize gp after a jsr.
When rtld runs the .fini section in a shared lib (C++), the code in
question from .../contrib/gdb/config/alpha/crtbegin.asm first calls
__do_globals_dtors_aux and then __do_frame_takedown. Unfortunately, the
value of gp after a jsr is undefined and in this case had changed from before
the call, probably as a result of calling code in some other shared library.
The normal calling convention for alpha is to re-initialize gp using
'ldgp gp,0(ra)' after a jsr instruction but in this case no such
re-initialization is done. This leads to a bogus value being read for the
address of __do_frame_takedown and a quick segfault.
Submitted by: dfr
Obtained from: GCC 3.0
Revision Changes Path
1.2 +89 -4 src/contrib/gcc.295/config/alpha/crtbegin.asm
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