diff options
author | Thomas Schwinge <thomas@codesourcery.com> | 2012-05-24 23:08:09 +0200 |
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committer | Thomas Schwinge <thomas@codesourcery.com> | 2012-05-24 23:08:09 +0200 |
commit | 2910b7c5b1d55bc304344b584a25ea571a9075fb (patch) | |
tree | bfbfbc98d4c0e205d2726fa44170a16e8421855e /open_issues/glibc/t | |
parent | 35b719f54c96778f571984065579625bc9f15bf5 (diff) |
Prepare toolchain/logs/master branch.
Diffstat (limited to 'open_issues/glibc/t')
-rw-r--r-- | open_issues/glibc/t/tls-threadvar.mdwn | 31 | ||||
-rw-r--r-- | open_issues/glibc/t/tls.mdwn | 66 |
2 files changed, 0 insertions, 97 deletions
diff --git a/open_issues/glibc/t/tls-threadvar.mdwn b/open_issues/glibc/t/tls-threadvar.mdwn deleted file mode 100644 index e72732ab..00000000 --- a/open_issues/glibc/t/tls-threadvar.mdwn +++ /dev/null @@ -1,31 +0,0 @@ -[[!meta copyright="Copyright © 2011, 2012 Free Software Foundation, Inc."]] - -[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable -id="license" text="Permission is granted to copy, distribute and/or modify this -document under the terms of the GNU Free Documentation License, Version 1.2 or -any later version published by the Free Software Foundation; with no Invariant -Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license -is included in the section entitled [[GNU Free Documentation -License|/fdl]]."]]"""]] - -[[!tag open_issue_glibc open_issue_libpthread]] - -This basically means to get rid of `sysdeps/mach/hurd/bits/libc-tsd.h` (and -thus the `_HURD_THREADVAR_*`/`_hurd_threadvar_location` interface), and -directly use `__thread` instead. - -IRC, freenode, #hurd, 2011-10-23: - - <tschwinge> youpi: If we want to replace threadvars with TLS, there is one - problem: the threadvars interface is publically exported: - /usr/include/hurd/threadvar.h. - <tschwinge> youpi: But I am somewhat inclined to say that the only user of - this is libthreads/libpthread. Do you think differently? - <youpi> tschwinge: that's very probable - <youpi> so I think we can just drop it - <youpi> (people should use TLS anyway) - -[[libpthread_set_stack_size]]. - -After this has been done, probably the whole `__libc_tsd_*` stuff can be -dropped altogether, and `__thread` directly be used in glibc. diff --git a/open_issues/glibc/t/tls.mdwn b/open_issues/glibc/t/tls.mdwn deleted file mode 100644 index 14ef36e4..00000000 --- a/open_issues/glibc/t/tls.mdwn +++ /dev/null @@ -1,66 +0,0 @@ -[[!meta copyright="Copyright © 2011 Free Software Foundation, Inc."]] - -[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable -id="license" text="Permission is granted to copy, distribute and/or modify this -document under the terms of the GNU Free Documentation License, Version 1.2 or -any later version published by the Free Software Foundation; with no Invariant -Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license -is included in the section entitled [[GNU Free Documentation -License|/fdl]]."]]"""]] - -[[!tag open_issue_glibc open_issue_libpthread]] - -# To Do - - * Discuss d2431f633e6139a62e1575ec18830f7e81160cf0 with Samuel. - - * `TLS_INIT_TP_EXPENSIVE` is unused; Hurd def. can be removed. - - -# Documentation - -[[!taglink open_issue_documentation]] - - * IRC, freenode, #hurd, 2011-11-26 - - <tschwinge> In glibc multiarch support (strcasecmp for i686 SSE3, etc.) - there is access to memory via gs: -- this will need to be changed for - us, right? - <youpi> depends on the access - <tschwinge> * `optimized strcasecmp and strncasecmp for x86-32` - (multiarch), - <tschwinge> 76e3966e9efc3808a9e7ad09121c5dfc1211c20b + - <tschwinge> 6abf346582ba678f4850a88b4a5950593841df1d + - <tschwinge> 5583a0862cf94f71cbcde91c4043a20af65facca. `gs` - access. - <youpi> + movl __libc_tsd_LOCALE@GOTNTPOFF(%ebx), %eax - <youpi> that's handled by the linker fine - <youpi> it's only the things held in the tcb_t structure which can pose - problem - <tschwinge> tcbhead_t? - <tschwinge> I'm looking at this. - <tschwinge> So, at gs:0, there is the TCB. - <tschwinge> And we have the same layout as NPTL/Linux, just that we - don't have as much data there as they have. - <tschwinge> We're missing multiple_threads, sysinfo, sttack_guard, - pointer_guard, gscope_flag, private_futex, __private_tm[5]. - <tschwinge> So, if one of these is referenced (be it my name or by - numeric offset), this is invalid for us. - <tschwinge> Anything else should work equivalently. - <youpi> yes - <youpi> usually the only numeric offset being used is 0 - <youpi> so it would simply not build - <tschwinge> And the other offsers are generated via tcb-offsets.sym. - <tschwinge> glibc's elf/stackguard-macros.h is wrong for us (but not - used anywhere apart from elf/tst-stackguard1.c, I think). - <tschwinge> __thread __locale_t __libc_tsd_LOCALE = &_nl_global_locale; - -- this means that a __libc_tsd_LOCALE values will be in the TLS - segment, and this is what is being accessed from the assembler code - with %gs:__libc_tsd_LOCALE@NTPOFF, and the linker will resolve this. - <youpi> yes - <youpi> see in the nm output, the libc_tsd symbols - <youpi> these provide the offsets - <tschwinge> youpi: Thank you, I'm now understanding this part of TLS - much better. - <youpi> have you had a look at the tls.pdf from Uli ? - <youpi> all the gory details are there :) |