mirror of
https://github.com/tinygo-org/tinygo.git
synced 2026-08-03 18:47:47 +00:00
Ayke van Laethem
c199dd03c7
This is required according to the Windows x64 calling convention: https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention?view=msvc-170#callercallee-saved-registers We didn't do this, and this didn't appear to cause any problems. But we should do it anyway for correctness.
84 lines
2.3 KiB
ArmAsm
84 lines
2.3 KiB
ArmAsm
// Windows on amd64 has a slightly different ABI than other (*nix) systems.
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// Therefore, assembly functions need to be tweaked slightly.
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//
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// The calling convention is described here:
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// https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention?view=msvc-170
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.section .text.tinygo_startTask,"ax"
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.global tinygo_startTask
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tinygo_startTask:
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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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// Set the first argument of the goroutine start wrapper, which contains all
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// the arguments.
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movq %r13, %rcx
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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.
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// This has to be a call, not a jump, to keep the stack correctly aligned.
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callq tinygo_pause
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.global tinygo_swapTask
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.section .text.tinygo_swapTask,"ax"
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tinygo_swapTask:
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// This function gets the following parameters:
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// %rcx = newStack uintptr
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// %rdx = 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 %rsi
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pushq %rdi
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pushq %rbp
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sub $160, %rsp
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movaps %xmm6, 144(%rsp)
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movaps %xmm7, 128(%rsp)
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movaps %xmm8, 112(%rsp)
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movaps %xmm9, 96(%rsp)
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movaps %xmm10, 80(%rsp)
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movaps %xmm11, 64(%rsp)
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movaps %xmm12, 48(%rsp)
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movaps %xmm13, 32(%rsp)
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movaps %xmm14, 16(%rsp)
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movaps %xmm15, 0(%rsp)
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pushq %rbx
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// Save the current stack pointer in oldStack.
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movq %rsp, (%rdx)
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// Switch to the new stack pointer.
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movq %rcx, %rsp
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// Load saved register from the new stack.
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popq %rbx
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movaps 0(%rsp), %xmm15
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movaps 16(%rsp), %xmm14
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movaps 32(%rsp), %xmm13
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movaps 48(%rsp), %xmm12
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movaps 64(%rsp), %xmm11
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movaps 80(%rsp), %xmm10
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movaps 96(%rsp), %xmm9
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movaps 112(%rsp), %xmm8
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movaps 128(%rsp), %xmm7
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movaps 144(%rsp), %xmm6
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add $160, %rsp
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popq %rbp
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popq %rdi
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popq %rsi
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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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