diff options
| author | Maciej W. Rozycki <macro@mips.com> | 2018-07-05 18:06:43 +0100 |
|---|---|---|
| committer | Maciej W. Rozycki <macro@mips.com> | 2018-07-05 18:06:43 +0100 |
| commit | 9449a295ad7e30f3a787421cb22aaa475f950549 (patch) | |
| tree | dc51ac41c40921f14229dd25cb3d98bb0141d4cf | |
| parent | d6da5cb6a8e0e8a9ce92b7d951a254cf325248d7 (diff) | |
libc-abis: Define ABSOLUTE ABI [BZ #19818][BZ #23307]
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>
| -rw-r--r-- | ChangeLog | 8 | ||||
| -rw-r--r-- | NEWS | 7 | ||||
| -rw-r--r-- | libc-abis | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/mips/libc-abis | 2 |
4 files changed, 19 insertions, 0 deletions
@@ -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] @@ -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). @@ -46,3 +46,5 @@ IFUNC powerpc64-*-linux* IFUNC powerpc-*-linux* IFUNC sparc64-*-linux* IFUNC sparc-*-linux* +# Absolute (SHN_ABS) symbols working correctly. +ABSOLUTE diff --git a/sysdeps/unix/sysv/linux/mips/libc-abis b/sysdeps/unix/sysv/linux/mips/libc-abis index 14ff60322a..eaea558720 100644 --- a/sysdeps/unix/sysv/linux/mips/libc-abis +++ b/sysdeps/unix/sysv/linux/mips/libc-abis @@ -14,3 +14,5 @@ UNIQUE # # MIPS O32 FP64 MIPS_O32_FP64 mips*-*-linux* +# Absolute (SHN_ABS) symbols working correctly. +ABSOLUTE |