86 lines
2.4 KiB
ArmAsm
86 lines
2.4 KiB
ArmAsm
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// SPDX-License-Identifier: Apache-2.0
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// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
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//go:build darwin || freebsd || linux || windows
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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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SUB $STACK_SIZE, RSP // push structure pointer
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MOVD R0, PTR_ADDRESS(RSP)
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MOVD R0, R9
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FMOVD syscall15Args_f1(R9), F0 // f1
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FMOVD syscall15Args_f2(R9), F1 // f2
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FMOVD syscall15Args_f3(R9), F2 // f3
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FMOVD syscall15Args_f4(R9), F3 // f4
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FMOVD syscall15Args_f5(R9), F4 // f5
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FMOVD syscall15Args_f6(R9), F5 // f6
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FMOVD syscall15Args_f7(R9), F6 // f7
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FMOVD syscall15Args_f8(R9), F7 // f8
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MOVD syscall15Args_a1(R9), R0 // a1
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MOVD syscall15Args_a2(R9), R1 // a2
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MOVD syscall15Args_a3(R9), R2 // a3
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MOVD syscall15Args_a4(R9), R3 // a4
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MOVD syscall15Args_a5(R9), R4 // a5
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MOVD syscall15Args_a6(R9), R5 // a6
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MOVD syscall15Args_a7(R9), R6 // a7
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MOVD syscall15Args_a8(R9), R7 // a8
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MOVD syscall15Args_a9(R9), R10
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MOVD R10, 0(RSP) // push a9 onto stack
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MOVD syscall15Args_a10(R9), R10
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MOVD R10, 8(RSP) // push a10 onto stack
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MOVD syscall15Args_a11(R9), R10
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MOVD R10, 16(RSP) // push a11 onto stack
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MOVD syscall15Args_a12(R9), R10
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MOVD R10, 24(RSP) // push a12 onto stack
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MOVD syscall15Args_a13(R9), R10
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MOVD R10, 32(RSP) // push a13 onto stack
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MOVD syscall15Args_a14(R9), R10
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MOVD R10, 40(RSP) // push a14 onto stack
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MOVD syscall15Args_a15(R9), R10
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MOVD R10, 48(RSP) // push a15 onto stack
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MOVD syscall15Args_fn(R9), R10 // fn
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BL (R10)
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MOVD PTR_ADDRESS(RSP), R2 // pop structure pointer
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ADD $STACK_SIZE, RSP
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MOVD R0, syscall15Args_r1(R2) // save r1
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FMOVD F0, syscall15Args_r2(R2) // save r2
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RET
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