mirror of
https://github.com/tinygo-org/tinygo.git
synced 2026-08-03 10:37:46 +00:00
Ayke van Laethem
725518f007
This adds linux/mipsle (little endian Mips) support to TinyGo. It also adds experimental linux/mips (big-endian) support. It doesn't quite work yet, some parts of the standard library (like the reflect package) currently seem to assume a little-endian system.
62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
//go:build scheduler.tasks && (mips || mipsle)
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package task
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import "unsafe"
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var systemStack uintptr
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// calleeSavedRegs is the list of registers that must be saved and restored when
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// switching between tasks. Also see task_stack_mips.S that relies on the exact
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// layout of this struct.
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type calleeSavedRegs struct {
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s0 uintptr
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s1 uintptr
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s2 uintptr
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s3 uintptr
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s4 uintptr
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s5 uintptr
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s6 uintptr
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s7 uintptr
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s8 uintptr
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ra uintptr
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}
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// archInit runs architecture-specific setup for the goroutine startup.
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func (s *state) archInit(r *calleeSavedRegs, fn uintptr, args unsafe.Pointer) {
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// Store the initial sp for the startTask function (implemented in assembly).
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s.sp = uintptr(unsafe.Pointer(r))
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// Initialize the registers.
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// These will be popped off of the stack on the first resume of the goroutine.
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// Start the function at tinygo_startTask (defined in src/internal/task/task_stack_mipsle.S).
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// This assembly code calls a function (passed in s0) with a single argument
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// (passed in s1). After the function returns, it calls Pause().
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r.ra = uintptr(unsafe.Pointer(&startTask))
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// Pass the function to call in s0.
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// This function is a compiler-generated wrapper which loads arguments out of a struct pointer.
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// See createGoroutineStartWrapper (defined in compiler/goroutine.go) for more information.
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r.s0 = fn
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// Pass the pointer to the arguments struct in s1.
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r.s1 = uintptr(args)
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}
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func (s *state) resume() {
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swapTask(s.sp, &systemStack)
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}
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func (s *state) pause() {
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newStack := systemStack
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systemStack = 0
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swapTask(newStack, &s.sp)
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}
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// SystemStack returns the system stack pointer when called from a task stack.
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// When called from the system stack, it returns 0.
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func SystemStack() uintptr {
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return systemStack
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}
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