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runtime: move/refactor some GC-related code

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Instead of putting tinygo_scanCurrentStack in scheduler_*.S files, put
them in dedicated files. The function tinygo_scanCurrentStack has
nothing to do with scheduling and so doesn't belong there. Additionally,
while scheduling code is made specific for the Cortex-M, the
tinygo_scanCurrentStack is generic to all ARM targets so this move
removes some duplication there.

Specifically:

  * tinygo_scanCurrentStack is moved out of scheduler_cortexm.S as it
    isn't really part of the scheduler. It is now gc_arm.S.
  * Same for the AVR target.
  * Same for the RISCV target.
  * scheduler_gba.S is removed, using gc_arm.S instead as it only
    contains tinygo_scanCurrentStack.
This commit is contained in:
Ayke van Laethem
2020-09-25 15:59:38 +02:00
committed by Ron Evans
parent 7123941df0
commit bfa29f17da
9 changed files with 70 additions and 86 deletions
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src/runtime/scheduler_cortexm.S
-31
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@@ -136,34 +136,3 @@ tinygo_swapTask:
#endif
.cfi_endproc
.size tinygo_swapTask, .-tinygo_swapTask
.section .text.tinygo_scanCurrentStack
.global tinygo_scanCurrentStack
.type tinygo_scanCurrentStack, %function
tinygo_scanCurrentStack:
.cfi_startproc
// Save callee-saved registers onto the stack.
#if defined(__thumb2__)
push {r4-r11, lr}
.cfi_def_cfa_offset 9*4
#else
mov r0, r8
mov r1, r9
mov r2, r10
mov r3, r11
push {r0-r3, lr}
.cfi_def_cfa_offset 5*4
push {r4-r7}
.cfi_def_cfa_offset 4*4
#endif
// Scan the stack.
mov r0, sp
bl tinygo_scanstack
// Restore stack state and return.
add sp, #32
.cfi_def_cfa_offset 1*4
pop {pc}
.cfi_endproc
.size tinygo_scanCurrentStack, .-tinygo_scanCurrentStack