9f5066aa6f
This results in smaller and likely more efficient code. It does require some architecture specific code for each architecture, but I've kept the amount of code as small as possible.
74 строки
2 КиБ
ArmAsm
74 строки
2 КиБ
ArmAsm
#ifdef __MACH__ // Darwin
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.global _tinygo_startTask
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_tinygo_startTask:
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#else // Linux etc
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.section .text.tinygo_startTask
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.global tinygo_startTask
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tinygo_startTask:
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#endif
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.cfi_startproc
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// Small assembly stub for starting a goroutine. This is already run on the
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// new stack, with the callee-saved registers already loaded.
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// Most importantly, r12 contain the pc of the to-be-started function and
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// r13 contain the only argument it is given. Multiple arguments are packed
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// into one by storing them in a new allocation.
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// Indicate to the unwinder that there is nothing to unwind, this is the
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// root frame. It avoids bogus extra frames in GDB like here:
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// #10 0x00000000004277b6 in <goroutine wrapper> () at [...]
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// #11 0x00000000004278f3 in tinygo_startTask () at [...]
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// #12 0x0000000000002030 in ?? ()
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// #13 0x0000000000000071 in ?? ()
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.cfi_undefined rip
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// Set the first argument of the goroutine start wrapper, which contains all
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// the arguments.
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movq %r13, %rdi
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// Branch to the "goroutine start" function.
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callq *%r12
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// After return, exit this goroutine. This is a tail call.
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#ifdef __MACH__
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jmp _tinygo_pause
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#else
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jmp tinygo_pause
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#endif
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.cfi_endproc
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#ifdef __MACH__ // Darwin
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.global _tinygo_swapTask
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_tinygo_swapTask:
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#else // Linux etc
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.global tinygo_swapTask
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.section .text.tinygo_swapTask
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tinygo_swapTask:
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#endif
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// This function gets the following parameters:
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// %rdi = newStack uintptr
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// %rsi = oldStack *uintptr
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// Save all callee-saved registers:
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pushq %r15
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pushq %r14
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pushq %r13
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pushq %r12
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pushq %rbp
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pushq %rbx
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// Save the current stack pointer in oldStack.
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movq %rsp, (%rsi)
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// Switch to the new stack pointer.
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movq %rdi, %rsp
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// Load saved register from the new stack.
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popq %rbx
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popq %rbp
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popq %r12
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popq %r13
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popq %r14
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popq %r15
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// Return into the new task, as if tinygo_swapTask was a regular call.
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ret
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