sys_arm64.s raw

   1  // SPDX-License-Identifier: Apache-2.0
   2  // SPDX-FileCopyrightText: 2022 The Ebitengine Authors
   3  
   4  //go:build darwin || freebsd || linux || netbsd || windows
   5  
   6  #include "textflag.h"
   7  #include "go_asm.h"
   8  #include "funcdata.h"
   9  
  10  #define STACK_SIZE 64
  11  #define PTR_ADDRESS (STACK_SIZE - 8)
  12  
  13  // syscall15X calls a function in libc on behalf of the syscall package.
  14  // syscall15X takes a pointer to a struct like:
  15  // struct {
  16  //	fn    uintptr
  17  //	a1    uintptr
  18  //	a2    uintptr
  19  //	a3    uintptr
  20  //	a4    uintptr
  21  //	a5    uintptr
  22  //	a6    uintptr
  23  //	a7    uintptr
  24  //	a8    uintptr
  25  //	a9    uintptr
  26  //	a10    uintptr
  27  //	a11    uintptr
  28  //	a12    uintptr
  29  //	a13    uintptr
  30  //	a14    uintptr
  31  //	a15    uintptr
  32  //	r1    uintptr
  33  //	r2    uintptr
  34  //	err   uintptr
  35  // }
  36  // syscall15X must be called on the g0 stack with the
  37  // C calling convention (use libcCall).
  38  GLOBL ·syscall15XABI0(SB), NOPTR|RODATA, $8
  39  DATA ·syscall15XABI0(SB)/8, $syscall15X(SB)
  40  TEXT syscall15X(SB), NOSPLIT, $0
  41  	SUB  $STACK_SIZE, RSP     // push structure pointer
  42  	MOVD R0, PTR_ADDRESS(RSP)
  43  	MOVD R0, R9
  44  
  45  	FMOVD syscall15Args_f1(R9), F0 // f1
  46  	FMOVD syscall15Args_f2(R9), F1 // f2
  47  	FMOVD syscall15Args_f3(R9), F2 // f3
  48  	FMOVD syscall15Args_f4(R9), F3 // f4
  49  	FMOVD syscall15Args_f5(R9), F4 // f5
  50  	FMOVD syscall15Args_f6(R9), F5 // f6
  51  	FMOVD syscall15Args_f7(R9), F6 // f7
  52  	FMOVD syscall15Args_f8(R9), F7 // f8
  53  
  54  	MOVD syscall15Args_a1(R9), R0       // a1
  55  	MOVD syscall15Args_a2(R9), R1       // a2
  56  	MOVD syscall15Args_a3(R9), R2       // a3
  57  	MOVD syscall15Args_a4(R9), R3       // a4
  58  	MOVD syscall15Args_a5(R9), R4       // a5
  59  	MOVD syscall15Args_a6(R9), R5       // a6
  60  	MOVD syscall15Args_a7(R9), R6       // a7
  61  	MOVD syscall15Args_a8(R9), R7       // a8
  62  	MOVD syscall15Args_arm64_r8(R9), R8 // r8
  63  
  64  	MOVD syscall15Args_a9(R9), R10
  65  	MOVD R10, 0(RSP)                // push a9 onto stack
  66  	MOVD syscall15Args_a10(R9), R10
  67  	MOVD R10, 8(RSP)                // push a10 onto stack
  68  	MOVD syscall15Args_a11(R9), R10
  69  	MOVD R10, 16(RSP)               // push a11 onto stack
  70  	MOVD syscall15Args_a12(R9), R10
  71  	MOVD R10, 24(RSP)               // push a12 onto stack
  72  	MOVD syscall15Args_a13(R9), R10
  73  	MOVD R10, 32(RSP)               // push a13 onto stack
  74  	MOVD syscall15Args_a14(R9), R10
  75  	MOVD R10, 40(RSP)               // push a14 onto stack
  76  	MOVD syscall15Args_a15(R9), R10
  77  	MOVD R10, 48(RSP)               // push a15 onto stack
  78  
  79  	MOVD syscall15Args_fn(R9), R10 // fn
  80  	BL   (R10)
  81  
  82  	MOVD PTR_ADDRESS(RSP), R2 // pop structure pointer
  83  	ADD  $STACK_SIZE, RSP
  84  
  85  	MOVD  R0, syscall15Args_a1(R2) // save r1
  86  	MOVD  R1, syscall15Args_a2(R2) // save r3
  87  	FMOVD F0, syscall15Args_f1(R2) // save f0
  88  	FMOVD F1, syscall15Args_f2(R2) // save f1
  89  	FMOVD F2, syscall15Args_f3(R2) // save f2
  90  	FMOVD F3, syscall15Args_f4(R2) // save f3
  91  
  92  	RET
  93