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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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8
ChangeLog
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@ -1,3 +1,11 @@
2018-07-05 Maciej W. Rozycki <macro@mips.com>
[BZ #19818]
[BZ #23307]
* libc-abis (ABSOLUTE): New ABI.
* sysdeps/unix/sysv/linux/mips/libc-abis (ABSOLUTE): New ABI.
* NEWS: Mention the new ABI.
2018-07-05 Florian Weimer <fweimer@redhat.com>
[BZ # 17662]

7
NEWS
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@ -9,6 +9,13 @@ Version 2.28
Major new features:
* The GNU C Library now has correct support for ABSOLUTE symbols
(SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
relocated incorrectly or in some cases discarded. The GNU linker can
make use of the newer semantics, but it must communicate it to the
dynamic loader by setting the ELF file's identification (EI_ABIVERSION
field) to indicate such support is required.
* Unicode 11.0.0 Support: Character encoding, character type info, and
transliteration tables are all updated to Unicode 11.0.0, using
generator scripts contributed by Mike FABIAN (Red Hat).

2
libc-abis
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@ -46,3 +46,5 @@ IFUNC powerpc64-*-linux*
IFUNC powerpc-*-linux*
IFUNC sparc64-*-linux*
IFUNC sparc-*-linux*
# Absolute (SHN_ABS) symbols working correctly.
ABSOLUTE

2
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