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cpukit/microblaze: Simplify dispatch assembly

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The dispatch code was unnecessarily saving and restoring an extra
interrupt frame. This avoids the extra frame and folds the dispatch call
into a fallthrough to the interrupt frame restoration code.
This commit is contained in:
Kinsey Moore
2022-01-28 17:12:57 -06:00
committed by Joel Sherrill
parent c6d8d1cb2b
commit 17e05426ca
1 changed files with 3 additions and 45 deletions
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48
cpukit/score/cpu/microblaze/cpu_asm.S
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@@ -115,7 +115,9 @@ after_stack_switch:
beqi r3, quick_exit
/* Return to interrupted thread and make it do a dispatch */
bri thread_dispatch
bralid r15, _Thread_Dispatch
nop
/* Fall through to quick exit */
quick_exit:
/* Simple return from nested interrupt */
@@ -141,47 +143,3 @@ quick_exit:
rtid r14, 0
nop
thread_dispatch:
/* Reserve stack */
addik r1, r1, -(CPU_INTERRUPT_FRAME_SIZE)
/* Save scratch registers */
swi r3, r1, MICROBLAZE_INTERRUPT_FRAME_R3
swi r4, r1, MICROBLAZE_INTERRUPT_FRAME_R4
swi r5, r1, MICROBLAZE_INTERRUPT_FRAME_R5
swi r6, r1, MICROBLAZE_INTERRUPT_FRAME_R6
swi r7, r1, MICROBLAZE_INTERRUPT_FRAME_R7
swi r8, r1, MICROBLAZE_INTERRUPT_FRAME_R8
swi r9, r1, MICROBLAZE_INTERRUPT_FRAME_R9
swi r10, r1, MICROBLAZE_INTERRUPT_FRAME_R10
swi r11, r1, MICROBLAZE_INTERRUPT_FRAME_R11
swi r12, r1, MICROBLAZE_INTERRUPT_FRAME_R12
swi r14, r1, MICROBLAZE_INTERRUPT_FRAME_R14
swi r15, r1, MICROBLAZE_INTERRUPT_FRAME_R15
swi r18, r1, MICROBLAZE_INTERRUPT_FRAME_R18
mfs r3, rmsr
swi r3, r1, MICROBLAZE_INTERRUPT_FRAME_MSR
bralid r15, _Thread_Dispatch
nop
/* Restore scratch registers */
lwi r3, r1, MICROBLAZE_INTERRUPT_FRAME_MSR
mts rmsr, r3
lwi r3, r1, MICROBLAZE_INTERRUPT_FRAME_R3
lwi r4, r1, MICROBLAZE_INTERRUPT_FRAME_R4
lwi r5, r1, MICROBLAZE_INTERRUPT_FRAME_R5
lwi r6, r1, MICROBLAZE_INTERRUPT_FRAME_R6
lwi r7, r1, MICROBLAZE_INTERRUPT_FRAME_R7
lwi r8, r1, MICROBLAZE_INTERRUPT_FRAME_R8
lwi r9, r1, MICROBLAZE_INTERRUPT_FRAME_R9
lwi r10, r1, MICROBLAZE_INTERRUPT_FRAME_R10
lwi r11, r1, MICROBLAZE_INTERRUPT_FRAME_R11
lwi r12, r1, MICROBLAZE_INTERRUPT_FRAME_R12
lwi r14, r1, MICROBLAZE_INTERRUPT_FRAME_R14
lwi r15, r1, MICROBLAZE_INTERRUPT_FRAME_R15
lwi r18, r1, MICROBLAZE_INTERRUPT_FRAME_R18
/* Free stack space */
addik r1, r1, CPU_INTERRUPT_FRAME_SIZE
bri quick_exit