diff options
| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2011-08-09 10:28:09 +0000 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2011-08-09 10:28:09 +0000 |
| commit | 40ae1fd5e64e3e37d422dd204813a1295b3ffc9c (patch) | |
| tree | d605db2a0f43d7ba125beae42b0a292b77d6f409 /cpukit/score/cpu/nios2/rtems/score/cpu.h | |
| parent | 2011-08-08 Sebastian Huber <sebastian.huber@embedded-brains.de> (diff) | |
| download | rtems-40ae1fd5e64e3e37d422dd204813a1295b3ffc9c.tar.bz2 | |
2011-08-09 Sebastian Huber <sebastian.huber@embedded-brains.de>
* cpu_asm.S, rtems/score/cpu.h: There is no need to save the global
pointer (gp) in the thread register context since it is a system wide
constant and set-up with the C runtime environment.
Diffstat (limited to 'cpukit/score/cpu/nios2/rtems/score/cpu.h')
| -rw-r--r-- | cpukit/score/cpu/nios2/rtems/score/cpu.h | 40 |
1 files changed, 19 insertions, 21 deletions
diff --git a/cpukit/score/cpu/nios2/rtems/score/cpu.h b/cpukit/score/cpu/nios2/rtems/score/cpu.h index 810671bb73..1d54aaa896 100644 --- a/cpukit/score/cpu/nios2/rtems/score/cpu.h +++ b/cpukit/score/cpu/nios2/rtems/score/cpu.h @@ -453,27 +453,27 @@ extern "C" { */ /** - * @ingroup CPUContext Management - * This defines the minimal set of integer and processor state registers - * that must be saved during a voluntary context switch from one thread - * to another. + * @brief Thread register context. + * + * The thread register context covers the non-volatile registers, the thread + * stack pointer, the return address, and the processor status. + * + * There is no need to save the global pointer (gp) since it is a system wide + * constant and set-up with the C runtime environment. */ typedef struct { - uint32_t r16; - uint32_t r17; - uint32_t r18; - uint32_t r19; - uint32_t r20; - uint32_t r21; - uint32_t r22; - uint32_t r23; - uint32_t gp; - uint32_t fp; - uint32_t sp; - uint32_t ra; - uint32_t status; - /* ienable? */ - /* ipending? */ + uint32_t r16; + uint32_t r17; + uint32_t r18; + uint32_t r19; + uint32_t r20; + uint32_t r21; + uint32_t r22; + uint32_t r23; + uint32_t fp; + uint32_t sp; + uint32_t ra; + uint32_t status; } Context_Control; #define _CPU_Context_Get_SP( _context ) \ @@ -866,9 +866,7 @@ uint32_t _CPU_ISR_Get_level( void ); #define _CPU_Context_Initialize( _the_context, _stack_base, _size, \ _isr, _entry_point, _is_fp ) \ do { \ - extern char _gp[]; \ uint32_t _stack = (uint32_t)(_stack_base) + (_size) - 4; \ - (_the_context)->gp = (void *)_gp; \ (_the_context)->fp = (void *)_stack; \ (_the_context)->sp = (void *)_stack; \ (_the_context)->ra = (void *)(_entry_point); \ |