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Add thread-local storage (TLS) support

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Tested and implemented on ARM, m68k, PowerPC and SPARC.  Other
architectures need more work.
This commit is contained in:
Sebastian Huber
2014-01-28 12:10:08 +01:00
parent 960fd8546f
commit 022851aba5
77 changed files with 1132 additions and 60 deletions
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27
doc/cpu_supplement/general.t
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@@ -314,6 +314,33 @@ interrupts and halts the processor.
In each of the architecture specific chapters, this describes the precise
operations of the default CPU specific fatal error handler.
@section Thread-Local Storage
In order to support thread-local storage (TLS) the CPU port must implement the
facilities mandated by the application binary interface (ABI) of the CPU
architecture. The CPU port must initialize the TLS area in the
@code{_CPU_Context_Initialize} function.
The board support package (BSP) must provide the following sections and symbols
in its linker command file:
@example
.tdata : @{
_TLS_Data_begin = .;
*(.tdata .tdata.* .gnu.linkonce.td.*)
_TLS_Data_end = .;
@}
.tbss : @{
_TLS_BSS_begin = .;
*(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon)
_TLS_BSS_end = .;
@}
_TLS_Data_size = _TLS_Data_end - _TLS_Data_begin;
_TLS_BSS_size = _TLS_BSS_end - _TLS_BSS_begin;
_TLS_Size = _TLS_BSS_end - _TLS_Data_begin;
_TLS_Alignment = ALIGNOF (.tdata);
@end example
@c
@c
@c