asm_linux_mipsx.s

     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  //go:build linux && (mips || mipsle)
     6  
     7  #include "textflag.h"
     8  #include "funcdata.h"
     9  
    10  //
    11  // System calls for mips, Linux
    12  //
    13  
    14  // func Syscall9(trap trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, err uintptr);
    15  // Actually Syscall8 but the rest of the code expects it to be named Syscall9.
    16  TEXT ·Syscall9(SB),NOSPLIT,$28-52
    17  	NO_LOCAL_POINTERS
    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	a4+16(FP), R7
    23  	MOVW	a5+20(FP), R8
    24  	MOVW	a6+24(FP), R9
    25  	MOVW	a7+28(FP), R10
    26  	MOVW	a8+32(FP), R11
    27  	MOVW	R8, 16(R29)
    28  	MOVW	R9, 20(R29)
    29  	MOVW	R10, 24(R29)
    30  	MOVW	R11, 28(R29)
    31  	MOVW	trap+0(FP), R2	// syscall entry
    32  	MOVW	R0, R3	// reset R3 to zero as 1-ret SYSCALL keeps it
    33  	SYSCALL
    34  	BEQ	R7, ok9
    35  	MOVW	$-1, R1
    36  	MOVW	R1, r1+40(FP)	// r1
    37  	MOVW	R0, r2+44(FP)	// r2
    38  	MOVW	R2, err+48(FP)	// errno
    39  	JAL	runtime·exitsyscall(SB)
    40  	RET
    41  ok9:
    42  	MOVW	R2, r1+40(FP)	// r1
    43  	MOVW	R3, r2+44(FP)	// r2
    44  	MOVW	R0, err+48(FP)	// errno
    45  	JAL	runtime·exitsyscall(SB)
    46  	RET
    47  
    48  // func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
    49  TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-24
    50  	MOVW	a1+4(FP), R4
    51  	MOVW	a2+8(FP), R5
    52  	MOVW	a3+12(FP), R6
    53  	MOVW	trap+0(FP), R2	// syscall entry
    54  	SYSCALL
    55  	BEQ	R7, ok
    56  	MOVW	$-1, R1
    57  	MOVW	R1, r1+16(FP)	// r1
    58  	MOVW	R2, err+20(FP)	// errno
    59  	RET
    60  ok:
    61  	MOVW	R2, r1+16(FP)	// r1
    62  	MOVW	R0, err+20(FP)	// errno
    63  	RET
    64  
    65  TEXT ·rawSyscallNoError(SB),NOSPLIT,$20-24
    66  	MOVW	a1+4(FP), R4
    67  	MOVW	a2+8(FP), R5
    68  	MOVW	a3+12(FP), R6
    69  	MOVW	trap+0(FP), R2	// syscall entry
    70  	MOVW	R0, R3	// reset R3 to zero as 1-ret SYSCALL keeps it
    71  	SYSCALL
    72  	MOVW	R2, r1+16(FP)	// r1
    73  	MOVW	R3, r2+20(FP)	// r2
    74  	RET
    75
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