2016-08-26 16:19:37 +01:00
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Adding support for the R_X86_64_REX_GOTPCRELX relocation type.
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This relocation is treated by the linker the same as the R_X86_64_GOTPCRELX type
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G + GOT + A - P to generate relative offsets to the GOT.
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The REX prefix has no influence in this stage.
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This caused breakage when enabling relro/bindnow hardening e.g. in ghcPaclages.vector
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Source: https://phabricator.haskell.org/D2303#67070
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2016-08-26 15:56:03 +01:00
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diff --git a/rts/Linker.c b/rts/Linker.c
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--- a/rts/Linker.c
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+++ b/rts/Linker.c
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@@ -5681,7 +5681,13 @@
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*(Elf64_Sword *)P = (Elf64_Sword)value;
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#endif
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break;
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-
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+/* These two relocations were introduced in glibc 2.23 and binutils 2.26.
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+ But in order to use them the system which compiles the bindist for GHC needs
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+ to have glibc >= 2.23. So only use them if they're defined. */
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+#if defined(R_X86_64_REX_GOTPCRELX) && defined(R_X86_64_GOTPCRELX)
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+ case R_X86_64_REX_GOTPCRELX:
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+ case R_X86_64_GOTPCRELX:
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+#endif
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case R_X86_64_GOTPCREL:
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{
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StgInt64 gotAddress = (StgInt64) &makeSymbolExtra(oc, ELF_R_SYM(info), S)->addr;
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