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#2468 closed defect (fixed)
Add Thread Local Storage (TLS) support on x86
| Reported by: | Joel Sherrill | Owned by: | Sebastian Huber |
|---|---|---|---|
| Priority: | normal | Milestone: | 5.1 |
| Component: | arch/i386 | Version: | |
| Severity: | normal | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: |
Description
The x86 is one of the architectures which does not support Thread Local Storage. Each architecture requires target architecture specific support to provide this standard language feature.
Details on the implementation by the compiler may be found at http://wiki.osdev.org/Thread_Local_Storage.
Based on this information, I think a segment register needs to be added to the thread context and some hooks to the TLS implemented.
Architecture information on TLS implementation should be added to the CPU Supplement document as this is part of the ABI and context switch.
As part of effort, the documentation for the general procedure of adding target specific TLS support should be added to the porting guide or reviewed.
Change History (8)
comment:1 Changed on 11/16/15 at 06:36:48 by Sebastian Huber
comment:2 Changed on 02/15/17 at 14:20:42 by Sebastian Huber
| Milestone: | 4.12 → Indefinite |
|---|---|
| Owner: | set to Needs Funding |
| Status: | new → assigned |
comment:3 Changed on 06/12/17 at 09:07:42 by Sebastian Huber <sebastian.huber@…>
In [changeset:"cb0d9a0747b1be84fb669b1c71e55bf0d860d2f8/rtems" cb0d9a0/rtems]:
comment:4 Changed on 06/12/17 at 09:08:08 by Sebastian Huber <sebastian.huber@…>
In [changeset:"7b0c74ffb085656d67554102857224223ee03f88/rtems" 7b0c74ff/rtems]:
comment:5 Changed on 06/12/17 at 09:10:26 by Sebastian Huber
| Component: | General → cpukit |
|---|---|
| Milestone: | Indefinite → 4.12.0 |
| Owner: | changed from Needs Funding to Sebastian Huber |
| Status: | assigned → accepted |
| Version: | 4.12 |
comment:6 Changed on 06/12/17 at 09:10:43 by Sebastian Huber <sebastian.huber@…>
| Resolution: | → fixed |
|---|---|
| Status: | accepted → closed |
In [changeset:"44c9e330bf3e7d79aa79689e296bda275cf4d22f/rtems-docs" 44c9e33/rtems-docs]:
comment:7 Changed on 10/16/17 at 06:19:06 by Sebastian Huber
| Component: | score → arch/i386 |
|---|
comment:8 Changed on 11/09/17 at 06:27:14 by Sebastian Huber
| Milestone: | 4.12.0 → 5.1 |
|---|
Milestone renamed
For documentation see for example:
https://docs.rtems.org/doc-current/share/rtems/html/cpu_supplement/Port-Specific-Information-Thread_002dLocal-Storage.html#Port-Specific-Information-Thread_002dLocal-Storage