github.com/stingnevermore/go@v0.0.0-20180120041312-3810f5bfed72/src/syscall/asm_linux_mipsx.s (about)

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build linux
     6  // +build mips mipsle
     7  
     8  #include "textflag.h"
     9  #include "funcdata.h"
    10  
    11  //
    12  // System calls for mips, Linux
    13  //
    14  
    15  // func Syscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr);
    16  
    17  TEXT	·Syscall(SB),NOSPLIT,$0-28
    18  	JAL	runtime·entersyscall(SB)
    19  	MOVW	a1+4(FP), R4
    20  	MOVW	a2+8(FP), R5
    21  	MOVW	a3+12(FP), R6
    22  	MOVW	R0, R7
    23  	MOVW	trap+0(FP), R2	// syscall entry
    24  	SYSCALL
    25  	BEQ	R7, ok
    26  	MOVW	$-1, R1
    27  	MOVW	R1, r1+16(FP)	// r1
    28  	MOVW	R0, r2+20(FP)	// r2
    29  	MOVW	R2, err+24(FP)	// errno
    30  	JAL	runtime·exitsyscall(SB)
    31  	RET
    32  ok:
    33  	MOVW	R2, r1+16(FP)	// r1
    34  	MOVW	R3, r2+20(FP)	// r2
    35  	MOVW	R0, err+24(FP)	// errno
    36  	JAL	runtime·exitsyscall(SB)
    37  	RET
    38  
    39  
    40  // func Syscall6(trap trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr);
    41  // 5th and 6th arg go at sp+16, sp+20.
    42  // Note that frame size of 20 means that 24 bytes gets reserved on stack.
    43  TEXT ·Syscall6(SB),NOSPLIT,$20-40
    44  	NO_LOCAL_POINTERS
    45  	JAL	runtime·entersyscall(SB)
    46  	MOVW	a1+4(FP), R4
    47  	MOVW	a2+8(FP), R5
    48  	MOVW	a3+12(FP), R6
    49  	MOVW	a4+16(FP), R7
    50  	MOVW	a5+20(FP), R8
    51  	MOVW	a6+24(FP), R9
    52  	MOVW	R8, 16(R29)
    53  	MOVW	R9, 20(R29)
    54  	MOVW	trap+0(FP), R2	// syscall entry
    55  	SYSCALL
    56  	BEQ	R7, ok6
    57  	MOVW	$-1, R1
    58  	MOVW	R1, r1+28(FP)	// r1
    59  	MOVW	R0, r2+32(FP)	// r2
    60  	MOVW	R2, err+36(FP)	// errno
    61  	JAL	runtime·exitsyscall(SB)
    62  	RET
    63  ok6:
    64  	MOVW	R2, r1+28(FP)	// r1
    65  	MOVW	R3, r2+32(FP)	// r2
    66  	MOVW	R0, err+36(FP)	// errno
    67  	JAL	runtime·exitsyscall(SB)
    68  	RET
    69  
    70  // func Syscall9(trap trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr);
    71  // Actually Syscall8 but the rest of the code expects it to be named Syscall9.
    72  TEXT ·Syscall9(SB),NOSPLIT,$28-52
    73  	NO_LOCAL_POINTERS
    74  	JAL	runtime·entersyscall(SB)
    75  	MOVW	a1+4(FP), R4
    76  	MOVW	a2+8(FP), R5
    77  	MOVW	a3+12(FP), R6
    78  	MOVW	a4+16(FP), R7
    79  	MOVW	a5+20(FP), R8
    80  	MOVW	a6+24(FP), R9
    81  	MOVW	a7+28(FP), R10
    82  	MOVW	a8+32(FP), R11
    83  	MOVW	R8, 16(R29)
    84  	MOVW	R9, 20(R29)
    85  	MOVW	R10, 24(R29)
    86  	MOVW	R11, 28(R29)
    87  	MOVW	trap+0(FP), R2	// syscall entry
    88  	SYSCALL
    89  	BEQ	R7, ok9
    90  	MOVW	$-1, R1
    91  	MOVW	R1, r1+40(FP)	// r1
    92  	MOVW	R0, r2+44(FP)	// r2
    93  	MOVW	R2, err+48(FP)	// errno
    94  	JAL	runtime·exitsyscall(SB)
    95  	RET
    96  ok9:
    97  	MOVW	R2, r1+40(FP)	// r1
    98  	MOVW	R3, r2+44(FP)	// r2
    99  	MOVW	R0, err+48(FP)	// errno
   100  	JAL	runtime·exitsyscall(SB)
   101  	RET
   102  
   103  TEXT ·RawSyscall(SB),NOSPLIT,$24-28
   104  	MOVW	a1+4(FP), R4
   105  	MOVW	a2+8(FP), R5
   106  	MOVW	a3+12(FP), R6
   107  	MOVW	trap+0(FP), R2	// syscall entry
   108  	SYSCALL
   109  	BEQ	R7, ok1
   110  	MOVW	$-1, R1
   111  	MOVW	R1, r1+16(FP)	// r1
   112  	MOVW	R0, r2+20(FP)	// r2
   113  	MOVW	R2, err+24(FP)	// errno
   114  	RET
   115  ok1:
   116  	MOVW	R2, r1+16(FP)	// r1
   117  	MOVW	R3, r2+20(FP)	// r2
   118  	MOVW	R0, err+24(FP)	// errno
   119  	RET
   120  
   121  TEXT ·RawSyscall6(SB),NOSPLIT,$20-40
   122  	MOVW	a1+4(FP), R4
   123  	MOVW	a2+8(FP), R5
   124  	MOVW	a3+12(FP), R6
   125  	MOVW	a4+16(FP), R7
   126  	MOVW	a5+20(FP), R8
   127  	MOVW	a6+24(FP), R9
   128  	MOVW	R8, 16(R29)
   129  	MOVW	R9, 20(R29)
   130  	MOVW	trap+0(FP), R2	// syscall entry
   131  	SYSCALL
   132  	BEQ	R7, ok2
   133  	MOVW	$-1, R1
   134  	MOVW	R1, r1+28(FP)	// r1
   135  	MOVW	R0, r2+32(FP)	// r2
   136  	MOVW	R2, err+36(FP)	// errno
   137  	RET
   138  ok2:
   139  	MOVW	R2, r1+28(FP)	// r1
   140  	MOVW	R3, r2+32(FP)	// r2
   141  	MOVW	R0, err+36(FP)	// errno
   142  	RET