64 lines
1.7 KiB
ArmAsm
64 lines
1.7 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 || (!cgo && 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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// syscall9X calls a function in libc on behalf of the syscall package.
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// syscall9X 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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// r1 uintptr
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// r2 uintptr
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// err uintptr
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// }
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// syscall9X must be called on the g0 stack with the
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// C calling convention (use libcCall).
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GLOBL ·syscall9XABI0(SB), NOPTR|RODATA, $8
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DATA ·syscall9XABI0(SB)/8, $syscall9X(SB)
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TEXT syscall9X(SB), NOSPLIT, $0
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SUB $16, RSP // push structure pointer
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MOVD R0, 8(RSP)
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FMOVD syscall9Args_f1(R0), F0 // f1
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FMOVD syscall9Args_f2(R0), F1 // f2
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FMOVD syscall9Args_f3(R0), F2 // f3
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FMOVD syscall9Args_f4(R0), F3 // f4
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FMOVD syscall9Args_f5(R0), F4 // f5
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FMOVD syscall9Args_f6(R0), F5 // f6
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FMOVD syscall9Args_f7(R0), F6 // f7
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FMOVD syscall9Args_f8(R0), F7 // f8
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MOVD syscall9Args_fn(R0), R12 // fn
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MOVD syscall9Args_a2(R0), R1 // a2
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MOVD syscall9Args_a3(R0), R2 // a3
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MOVD syscall9Args_a4(R0), R3 // a4
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MOVD syscall9Args_a5(R0), R4 // a5
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MOVD syscall9Args_a6(R0), R5 // a6
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MOVD syscall9Args_a7(R0), R6 // a7
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MOVD syscall9Args_a8(R0), R7 // a8
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MOVD syscall9Args_a9(R0), R8 // a9
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MOVD syscall9Args_a1(R0), R0 // a1
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MOVD R8, (RSP) // push a9 onto stack
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BL (R12)
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MOVD 8(RSP), R2 // pop structure pointer
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ADD $16, RSP
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MOVD R0, syscall9Args_r1(R2) // save r1
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FMOVD F0, syscall9Args_r2(R2) // save r2
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RET
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