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76 lines
1.8 KiB
ArmAsm
76 lines
1.8 KiB
ArmAsm
// SPDX-License-Identifier: Apache-2.0
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// SPDX-FileCopyrightText: 2025 The Ebitengine Authors
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//go:build linux
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#include "textflag.h"
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#include "go_asm.h"
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#include "funcdata.h"
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#include "abi_loong64.h"
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TEXT callbackasm1(SB), NOSPLIT|NOFRAME, $0
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NO_LOCAL_POINTERS
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SUBV $(16*8), R3, R14
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MOVD F0, 0(R14)
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MOVD F1, 8(R14)
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MOVD F2, 16(R14)
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MOVD F3, 24(R14)
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MOVD F4, 32(R14)
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MOVD F5, 40(R14)
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MOVD F6, 48(R14)
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MOVD F7, 56(R14)
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MOVV R4, 64(R14)
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MOVV R5, 72(R14)
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MOVV R6, 80(R14)
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MOVV R7, 88(R14)
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MOVV R8, 96(R14)
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MOVV R9, 104(R14)
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MOVV R10, 112(R14)
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MOVV R11, 120(R14)
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// Adjust SP by frame size.
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SUBV $(22*8), R3
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// It is important to save R30 because the go assembler
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// uses it for move instructions for a variable.
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// This line:
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// MOVV ·callbackWrap_call(SB), R4
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// Creates the instructions:
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// PCALAU12I off1(PC), R30
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// MOVV off2(R30), R4
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// R30 is a callee saved register so we are responsible
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// for ensuring its value doesn't change. So save it and
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// restore it at the end of this function.
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// R1 is the link register. crosscall2 doesn't save it
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// so it's saved here.
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MOVV R1, 0(R3)
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MOVV R30, 8(R3)
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// Create a struct callbackArgs on our stack.
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MOVV $(callbackArgs__size)(R3), R13
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MOVV R12, callbackArgs_index(R13) // callback index
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MOVV R14, callbackArgs_args(R13) // address of args vector
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MOVV $0, callbackArgs_result(R13) // result
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// Move parameters into registers
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// Get the ABIInternal function pointer
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// without <ABIInternal> by using a closure.
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MOVV ·callbackWrap_call(SB), R4
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MOVV (R4), R4 // fn unsafe.Pointer
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MOVV R13, R5 // frame (&callbackArgs{...})
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MOVV $0, R7 // ctxt uintptr
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JAL crosscall2(SB)
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// Get callback result.
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MOVV $(callbackArgs__size)(R3), R13
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MOVV callbackArgs_result(R13), R4
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// Restore LR and R30
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MOVV 0(R3), R1
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MOVV 8(R3), R30
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ADDV $(22*8), R3
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RET
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