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fix ld-behavior-dependent crash in ppc64 ldso startup

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the 32-bit pc-relative address for stage 2 of dynamic linker entry was
wrongly loaded with a zero-extending load instead of sign-extending
load, resulting in an invalid jump if the offset happened to be
negative, which depends on the linker's ordering of text sections.
This commit is contained in:
Rich Felker 2017-03-08 13:35:33 -05:00
parent 827c4e6fbe
commit fc85fb3860
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc64/reloc.h
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@ -27,6 +27,6 @@
" bl 1f \n" \
" .long " #sym "-. \n" \
"1: mflr %1 \n" \
" lwz %0, 0(%1) \n" \
" lwa %0, 0(%1) \n" \
" add %0, %0, %1 \n" \
: "=r"(*(fp)), "=r"((long){0}) : : "memory", "lr" )