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97 lines
2.3 KiB
ArmAsm
97 lines
2.3 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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#define STACK_SIZE 64
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#define PTR_ADDRESS (STACK_SIZE - 8)
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// syscall15X calls a function in libc on behalf of the syscall package.
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// syscall15X takes a pointer to a struct like:
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// struct {
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// fn uintptr
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// a1 uintptr
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// a2 uintptr
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// a3 uintptr
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// a4 uintptr
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// a5 uintptr
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// a6 uintptr
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// a7 uintptr
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// a8 uintptr
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// a9 uintptr
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// a10 uintptr
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// a11 uintptr
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// a12 uintptr
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// a13 uintptr
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// a14 uintptr
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// a15 uintptr
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// r1 uintptr
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// r2 uintptr
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// err uintptr
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// }
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// syscall15X must be called on the g0 stack with the
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// C calling convention (use libcCall).
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GLOBL ·syscall15XABI0(SB), NOPTR|RODATA, $8
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DATA ·syscall15XABI0(SB)/8, $syscall15X(SB)
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TEXT syscall15X(SB), NOSPLIT, $0
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// push structure pointer
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SUBV $STACK_SIZE, R3
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MOVV R4, PTR_ADDRESS(R3)
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MOVV R4, R13
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MOVD syscall15Args_f1(R13), F0 // f1
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MOVD syscall15Args_f2(R13), F1 // f2
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MOVD syscall15Args_f3(R13), F2 // f3
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MOVD syscall15Args_f4(R13), F3 // f4
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MOVD syscall15Args_f5(R13), F4 // f5
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MOVD syscall15Args_f6(R13), F5 // f6
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MOVD syscall15Args_f7(R13), F6 // f7
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MOVD syscall15Args_f8(R13), F7 // f8
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MOVV syscall15Args_a1(R13), R4 // a1
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MOVV syscall15Args_a2(R13), R5 // a2
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MOVV syscall15Args_a3(R13), R6 // a3
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MOVV syscall15Args_a4(R13), R7 // a4
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MOVV syscall15Args_a5(R13), R8 // a5
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MOVV syscall15Args_a6(R13), R9 // a6
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MOVV syscall15Args_a7(R13), R10 // a7
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MOVV syscall15Args_a8(R13), R11 // a8
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// push a9-a15 onto stack
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MOVV syscall15Args_a9(R13), R12
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MOVV R12, 0(R3)
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MOVV syscall15Args_a10(R13), R12
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MOVV R12, 8(R3)
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MOVV syscall15Args_a11(R13), R12
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MOVV R12, 16(R3)
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MOVV syscall15Args_a12(R13), R12
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MOVV R12, 24(R3)
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MOVV syscall15Args_a13(R13), R12
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MOVV R12, 32(R3)
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MOVV syscall15Args_a14(R13), R12
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MOVV R12, 40(R3)
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MOVV syscall15Args_a15(R13), R12
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MOVV R12, 48(R3)
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MOVV syscall15Args_fn(R13), R12
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JAL (R12)
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// pop structure pointer
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MOVV PTR_ADDRESS(R3), R13
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ADDV $STACK_SIZE, R3
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// save R4, R5
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MOVV R4, syscall15Args_a1(R13)
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MOVV R5, syscall15Args_a2(R13)
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// save f0-f3
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MOVD F0, syscall15Args_f1(R13)
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MOVD F1, syscall15Args_f2(R13)
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MOVD F2, syscall15Args_f3(R13)
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MOVD F3, syscall15Args_f4(R13)
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RET
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