mirror/glibc
2
0
Fork 0
mirror of git://sourceware.org/git/glibc.git synced 2025-04-24 14:41:06 +08:00
Code Issues Packages Projects Releases Wiki Activity

powerpc64le/power9: guard power9 strcmp against rtld usage [BZ# 25905]

Browse Source 
strcmp is used while resolving PLT references.  Vector registers
should not be used during this.  The P9 strcmp makes heavy use of
vector registers, so it should be avoided in rtld.

This prevents quiet vector register corruption when glibc is configured
with --disable-multi-arch and --with-cpu=power9.  This can be seen with
test-float64x-compat_totalordermag during the first call into
totalordermagf64x@GLIBC_2.27.

Add a guard to fallback to the power8 implementation when building
power9 strcmp for libraries other than libc.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Paul E. Murphy 2020-05-01 14:30:42 -05:00
parent a49e56a945
commit 4a4db1de2f
1 changed files with 2 additions and 0 deletions

2
sysdeps/powerpc/powerpc64/le/power9/rtld-strcmp.S Normal file

@ -0,0 +1,2 @@
/* Fallback to P8 which does not use vector regs for rtld. */
#include <sysdeps/powerpc/powerpc64/power8/strcmp.S>