sys_loong64.s raw

   1  // SPDX-License-Identifier: Apache-2.0
   2  // SPDX-FileCopyrightText: 2025 The Ebitengine Authors
   3  
   4  //go:build linux
   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  	// push structure pointer
  42  	SUBV	$STACK_SIZE, R3
  43  	MOVV	R4, PTR_ADDRESS(R3)
  44  	MOVV	R4, R13
  45  
  46  	MOVD	syscall15Args_f1(R13), F0	// f1
  47  	MOVD	syscall15Args_f2(R13), F1	// f2
  48  	MOVD	syscall15Args_f3(R13), F2	// f3
  49  	MOVD	syscall15Args_f4(R13), F3	// f4
  50  	MOVD	syscall15Args_f5(R13), F4	// f5
  51  	MOVD	syscall15Args_f6(R13), F5	// f6
  52  	MOVD	syscall15Args_f7(R13), F6	// f7
  53  	MOVD	syscall15Args_f8(R13), F7	// f8
  54  
  55  	MOVV	syscall15Args_a1(R13), R4	// a1
  56  	MOVV	syscall15Args_a2(R13), R5	// a2
  57  	MOVV	syscall15Args_a3(R13), R6	// a3
  58  	MOVV	syscall15Args_a4(R13), R7	// a4
  59  	MOVV	syscall15Args_a5(R13), R8	// a5
  60  	MOVV	syscall15Args_a6(R13), R9	// a6
  61  	MOVV	syscall15Args_a7(R13), R10	// a7
  62  	MOVV	syscall15Args_a8(R13), R11	// a8
  63  
  64  	// push a9-a15 onto stack
  65  	MOVV	syscall15Args_a9(R13), R12
  66  	MOVV	R12, 0(R3)
  67  	MOVV	syscall15Args_a10(R13), R12
  68  	MOVV	R12, 8(R3)
  69  	MOVV	syscall15Args_a11(R13), R12
  70  	MOVV	R12, 16(R3)
  71  	MOVV	syscall15Args_a12(R13), R12
  72  	MOVV	R12, 24(R3)
  73  	MOVV	syscall15Args_a13(R13), R12
  74  	MOVV	R12, 32(R3)
  75  	MOVV	syscall15Args_a14(R13), R12
  76  	MOVV	R12, 40(R3)
  77  	MOVV	syscall15Args_a15(R13), R12
  78  	MOVV	R12, 48(R3)
  79  
  80  	MOVV	syscall15Args_fn(R13), R12
  81  	JAL	(R12)
  82  
  83  	// pop structure pointer
  84  	MOVV	PTR_ADDRESS(R3), R13
  85  	ADDV	$STACK_SIZE, R3
  86  
  87  	// save R4, R5
  88  	MOVV	R4, syscall15Args_a1(R13)
  89  	MOVV	R5, syscall15Args_a2(R13)
  90  
  91  	// save f0-f3
  92  	MOVD	F0, syscall15Args_f1(R13)
  93  	MOVD	F1, syscall15Args_f2(R13)
  94  	MOVD	F2, syscall15Args_f3(R13)
  95  	MOVD	F3, syscall15Args_f4(R13)
  96  	RET
  97