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- // SPDX-License-Identifier: Apache-2.0
- // SPDX-FileCopyrightText: 2026 The Ebitengine Authors
- //go:build linux
- #include "textflag.h"
- #include "go_asm.h"
- #include "funcdata.h"
- TEXT callbackasm1(SB), NOSPLIT|NOFRAME, $0
- NO_LOCAL_POINTERS
- // Allocate stack frame: 48 + 16 + 64 + 16 = 144 bytes
- SUB $144, R13
- // Save callee-saved registers at SP+0
- MOVW R4, 0(R13)
- MOVW R5, 4(R13)
- MOVW R6, 8(R13)
- MOVW R7, 12(R13)
- MOVW R8, 16(R13)
- MOVW R9, 20(R13)
- MOVW g, 24(R13)
- MOVW R11, 28(R13)
- MOVW R14, 32(R13)
- // Save callback index (passed in R12) at SP+36
- MOVW R12, 36(R13)
- // Save integer arguments R0-R3 at SP+128 (frame[16..19])
- MOVW R0, 128(R13)
- MOVW R1, 132(R13)
- MOVW R2, 136(R13)
- MOVW R3, 140(R13)
- // Save floating point registers F0-F7 at SP+64 (frame[0..15])
- // Note: We always save these since we target hard-float ABI.
- MOVD F0, 64(R13)
- MOVD F1, 72(R13)
- MOVD F2, 80(R13)
- MOVD F3, 88(R13)
- MOVD F4, 96(R13)
- MOVD F5, 104(R13)
- MOVD F6, 112(R13)
- MOVD F7, 120(R13)
- // Set up callbackArgs at SP+48
- MOVW 36(R13), R4
- MOVW R4, 48(R13)
- ADD $64, R13, R4
- MOVW R4, 52(R13)
- MOVW $0, R4
- MOVW R4, 56(R13)
- // Call crosscall2(fn, frame, 0, ctxt)
- MOVW ·callbackWrap_call(SB), R0
- MOVW (R0), R0
- ADD $48, R13, R1
- MOVW $0, R2
- MOVW $0, R3
- BL crosscall2(SB)
- // Get result
- MOVW 56(R13), R0
- // Restore float registers
- MOVD 64(R13), F0
- MOVD 72(R13), F1
- MOVD 80(R13), F2
- MOVD 88(R13), F3
- MOVD 96(R13), F4
- MOVD 104(R13), F5
- MOVD 112(R13), F6
- MOVD 120(R13), F7
- // Restore callee-saved registers
- MOVW 0(R13), R4
- MOVW 4(R13), R5
- MOVW 8(R13), R6
- MOVW 12(R13), R7
- MOVW 16(R13), R8
- MOVW 20(R13), R9
- MOVW 24(R13), g
- MOVW 28(R13), R11
- MOVW 32(R13), R14
- ADD $144, R13
- RET
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