File size: 3,436 Bytes
04dc9f2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 | // Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#include "funcdata.h"
//
// System call support for Plan 9
//
//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string)
//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string)
//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
#define SYS_ERRSTR 41 /* from zsysnum_plan9.go */
TEXT 路Syscall(SB),NOSPLIT,$168-64
NO_LOCAL_POINTERS
CALL runtime路entersyscall<ABIInternal>(SB)
MOVQ trap+0(FP), BP // syscall entry
// copy args down
LEAQ a1+8(FP), SI
LEAQ sysargs-160(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+32(FP)
MOVQ $0, r2+40(FP)
CMPL AX, $-1
JNE ok3
LEAQ errbuf-128(SP), AX
MOVQ AX, sysargs-160(SP)
MOVQ $128, sysargs1-152(SP)
MOVQ $SYS_ERRSTR, BP
SYSCALL
CALL runtime路exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
MOVQ sysargs-160(SP), AX
MOVQ AX, errbuf-168(SP)
CALL runtime路gostring(SB)
LEAQ str-160(SP), SI
JMP copyresult3
ok3:
CALL runtime路exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
LEAQ 路emptystring(SB), SI
copyresult3:
LEAQ err+48(FP), DI
CLD
MOVSQ
MOVSQ
RET
TEXT 路Syscall6(SB),NOSPLIT,$168-88
NO_LOCAL_POINTERS
CALL runtime路entersyscall<ABIInternal>(SB)
MOVQ trap+0(FP), BP // syscall entry
// copy args down
LEAQ a1+8(FP), SI
LEAQ sysargs-160(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+56(FP)
MOVQ $0, r2+64(FP)
CMPL AX, $-1
JNE ok4
LEAQ errbuf-128(SP), AX
MOVQ AX, sysargs-160(SP)
MOVQ $128, sysargs1-152(SP)
MOVQ $SYS_ERRSTR, BP
SYSCALL
CALL runtime路exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
MOVQ sysargs-160(SP), AX
MOVQ AX, errbuf-168(SP)
CALL runtime路gostring(SB)
LEAQ str-160(SP), SI
JMP copyresult4
ok4:
CALL runtime路exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
LEAQ 路emptystring(SB), SI
copyresult4:
LEAQ err+72(FP), DI
CLD
MOVSQ
MOVSQ
RET
TEXT 路RawSyscall(SB),NOSPLIT,$0-56
MOVQ trap+0(FP), BP // syscall entry
// slide args down on top of system call number
LEAQ a1+8(FP), SI
LEAQ trap+0(FP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+32(FP)
MOVQ AX, r2+40(FP)
MOVQ AX, err+48(FP)
RET
TEXT 路RawSyscall6(SB),NOSPLIT,$0-80
MOVQ trap+0(FP), BP // syscall entry
// slide args down on top of system call number
LEAQ a1+8(FP), SI
LEAQ trap+0(FP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
SYSCALL
MOVQ AX, r1+56(FP)
MOVQ AX, r2+64(FP)
MOVQ AX, err+72(FP)
RET
#define SYS_SEEK 39 /* from zsysnum_plan9.go */
//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
TEXT 路seek(SB),NOSPLIT,$48-56
NO_LOCAL_POINTERS
LEAQ newoffset+32(FP), AX
MOVQ AX, placeholder+0(FP)
// copy args down
LEAQ placeholder+0(FP), SI
LEAQ sysargs-40(SP), DI
CLD
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVSQ
MOVQ $SYS_SEEK, BP // syscall entry
SYSCALL
CMPL AX, $-1
JNE ok6
MOVQ AX, newoffset+32(FP)
CALL syscall路errstr(SB)
MOVQ SP, SI
JMP copyresult6
ok6:
LEAQ 路emptystring(SB), SI
copyresult6:
LEAQ err+40(FP), DI
CLD
MOVSQ
MOVSQ
RET
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