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| author | Anton Blanchard <anton@au1.ibm.com> | 2013-08-17 18:34:40 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2013-10-04 10:37:59 +0930 |
| commit | be1e5d311342e08ae1f8013342df27b7ded2c156 (patch) | |
| tree | ccf1ca254c3aa1392262c72de0b960eb1ec7ec21 /assert | |
| parent | fef13a78ea30d4c26d6bab48d731ebe864ee31b0 (diff) | |
| download | glibc-be1e5d311342e08ae1f8013342df27b7ded2c156.tar.gz glibc-be1e5d311342e08ae1f8013342df27b7ded2c156.tar.xz glibc-be1e5d311342e08ae1f8013342df27b7ded2c156.zip | |
PowerPC LE setjmp/longjmp
http://sourceware.org/ml/libc-alpha/2013-08/msg00089.html Little-endian fixes for setjmp/longjmp. When writing these I noticed the setjmp code corrupts the non volatile VMX registers when using an unaligned buffer. Anton fixed this, and also simplified it quite a bit. The current code uses boilerplate for the case where we want to store 16 bytes to an unaligned address. For that we have to do a read/modify/write of two aligned 16 byte quantities. In our case we are storing a bunch of back to back data (consective VMX registers), and only the start and end of the region need the read/modify/write. [BZ #15723] * sysdeps/powerpc/jmpbuf-offsets.h: Comment fix. * sysdeps/powerpc/powerpc32/fpu/__longjmp-common.S: Correct _dl_hwcap access for little-endian. * sysdeps/powerpc/powerpc32/fpu/setjmp-common.S: Likewise. Don't destroy vmx regs when saving unaligned. * sysdeps/powerpc/powerpc64/__longjmp-common.S: Correct CR load. * sysdeps/powerpc/powerpc64/setjmp-common.S: Likewise CR save. Don't destroy vmx regs when saving unaligned.
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