caf35cfc41
This has been a *lot* of work, trying to understand the Xtensa windowed registers ABI. But in the end I managed to come up with a very simple implementation that so far seems to work very well. I tested this with both blinky examples (with blinky2 slightly edited) and ./testdata/coroutines.go to verify that it actually works. Most development happened on the ESP32 QEMU fork from Espressif (https://github.com/espressif/qemu/wiki) but I also verified that it works on a real ESP32.
20 строки
377 Б
Go
20 строки
377 Б
Go
// +build xtensa
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package runtime
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import "device"
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const GOARCH = "arm" // xtensa pretends to be arm
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// The bitness of the CPU (e.g. 8, 32, 64).
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const TargetBits = 32
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// Align on a word boundary.
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func align(ptr uintptr) uintptr {
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return (ptr + 3) &^ 3
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}
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func getCurrentStackPointer() uintptr {
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// The stack pointer (sp) is a1.
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return device.AsmFull("mov {}, sp", nil)
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}
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