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libc-abis: Define ABSOLUTE ABI [BZ #19818][BZ #23307]

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Define a new ABSOLUTE ABI for static linker's use with EI_ABIVERSION
where correct absolute (SHN_ABS) symbol run-time load semantics is
required.  This way it can be ensured at static link time that a program
or DSO will not suffer from previous semantics where absolute symbols
were relocated by the base address, or symbols whose `st_value' is zero
silently ignored leading to a confusing "undefined symbol" error message
at load time, and instead "ELF file ABI version invalid" is printed with
old dynamic loaders, making it clear that there is an ABI version
incompatibility.

	[BZ #19818]
	[BZ #23307]
	* libc-abis (ABSOLUTE): New ABI.
	* sysdeps/unix/sysv/linux/mips/libc-abis (ABSOLUTE): New ABI.
	* NEWS: Mention the new ABI.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Maciej W. Rozycki
2018-07-05 18:06:43 +01:00
parent d6da5cb6a8
commit 9449a295ad
4 changed files with 19 additions and 0 deletions
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sysdeps/unix/sysv/linux/mips/libc-abis
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@ -14,3 +14,5 @@ UNIQUE
#
# MIPS O32 FP64
MIPS_O32_FP64 mips*-*-linux*
# Absolute (SHN_ABS) symbols working correctly.
ABSOLUTE