generic-library/bionic
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Improve the 32-bit ABI documentation.

Browse Source 
Change-Id: Ie5bfc8d6f7f3946100f653de0e006072e56e18d6
This commit is contained in:
Elliott Hughes 2015-12-19 09:36:16 -08:00
parent dd57119ced
commit 59fc2e8557
1 changed files with 16 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
README.md
View File

@ -169,9 +169,10 @@ As mentioned above, this is currently a two-step process:
Updating tzdata
---------------
This is fully automated:
This is fully automated (and these days handled by the libcore team, because
they own icu, and that needs to be updated in sync with bionic):
1. Run update-tzdata.py.
1. Run update-tzdata.py in external/icu/tools/.
Verifying changes
@ -268,18 +269,22 @@ However, this also makes it difficult to run the tests under GDB. To prevent
each test from being forked, run the tests with the flag `--no-isolate`.
LP32 ABI bugs
-------------
32-bit ABI bugs
---------------
This probably belongs in the NDK documentation rather than here, but these
are the known ABI bugs in LP32:
are the known ABI bugs in the 32-bit ABI:
* `time_t` is 32-bit. <http://b/5819737>
* `time_t` is 32-bit. <http://b/5819737>. In the 64-bit ABI, time_t is
64-bit.
* `off_t` is 32-bit. There is `off64_t`, but no `_FILE_OFFSET_BITS` support.
Many of the `off64_t` functions are missing in older releases, and
stdio uses 32-bit offsets, so there's no way to fully implement
`_FILE_OFFSET_BITS`.
* `off_t` is 32-bit. There is `off64_t`, and in newer releases there is
almost-complete support for `_FILE_OFFSET_BITS`. Unfortunately our stdio
implementation uses 32-bit offsets and -- worse -- function pointers to
functions that use 32-bit offsets, so there's no good way to implement
the last few pieces <http://b/24807045>. In the 64-bit ABI, off_t is
off64_t.
* `sigset_t` is too small on ARM and x86 (but correct on MIPS), so support
for real-time signals is broken. <http://b/5828899>
for real-time signals is broken. <http://b/5828899> In the 64-bit ABI,
`sigset_t` is the correct size for every architecture.