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Simplify TLS support in context switch

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There is no need to save the thread pointer in _CPU_Context_switch()
since it is a thread invariant.  It is initialized once in
_CPU_Context_Initialize().
This commit is contained in:
Sebastian Huber
2017-06-09 07:25:02 +02:00
parent a66accc553
commit 32b4a0c427
3 changed files with 7 additions and 13 deletions
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6
c/src/lib/libbsp/sparc/shared/irq_asm.S
View File

@@ -59,7 +59,11 @@
PUBLIC(_CPU_Context_switch)
SYM(_CPU_Context_switch):
st %g5, [%o0 + G5_OFFSET] ! save the global registers
st %g7, [%o0 + G7_OFFSET]
/*
* No need to save the thread pointer %g7 since it is a thread
* invariant. It is initialized once in _CPU_Context_Initialize().
*/
std %l0, [%o0 + L0_OFFSET] ! save the local registers
std %l2, [%o0 + L2_OFFSET]

1
c/src/lib/libcpu/powerpc/new-exceptions/cpu_asm.S
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@@ -336,7 +336,6 @@ PROC (_CPU_Context_switch):
PPC_GPR_STORE r30, PPC_CONTEXT_OFFSET_GPR30(r3)
PPC_GPR_STORE r31, PPC_CONTEXT_OFFSET_GPR31(r3)
stw r2, PPC_CONTEXT_OFFSET_GPR2(r3)
stw r11, PPC_CONTEXT_OFFSET_ISR_DISPATCH_DISABLE(r3)
#ifdef PPC_MULTILIB_ALTIVEC

13
cpukit/score/cpu/arm/cpu_asm.S
View File

@@ -56,24 +56,15 @@
DEFINE_FUNCTION_ARM(_CPU_Context_switch)
/* Start saving context */
GET_SELF_CPU_CONTROL r2
ldr r3, [r2, #PER_CPU_ISR_DISPATCH_DISABLE]
stm r0, {r4, r5, r6, r7, r8, r9, r10, r11, r13, r14}
#ifdef ARM_MULTILIB_HAS_THREAD_ID_REGISTER
mrc p15, 0, r3, c13, c0, 3
#endif
ldr r4, [r2, #PER_CPU_ISR_DISPATCH_DISABLE]
#ifdef ARM_MULTILIB_VFP
add r5, r0, #ARM_CONTEXT_CONTROL_D8_OFFSET
vstm r5, {d8-d15}
#endif
#ifdef ARM_MULTILIB_HAS_THREAD_ID_REGISTER
str r3, [r0, #ARM_CONTEXT_CONTROL_THREAD_ID_OFFSET]
#endif
str r4, [r0, #ARM_CONTEXT_CONTROL_ISR_DISPATCH_DISABLE]
str r3, [r0, #ARM_CONTEXT_CONTROL_ISR_DISPATCH_DISABLE]
#ifdef RTEMS_SMP
/*