File size: 3,216 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | // 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 386, 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 */
// Trap # in AX, args on stack above caller pc.
TEXT 路Syscall(SB),NOSPLIT,$148-32
NO_LOCAL_POINTERS
CALL runtime路entersyscall(SB)
MOVL trap+0(FP), AX // syscall entry
// copy args down
LEAL a1+4(FP), SI
LEAL sysargs-144(SP), DI
CLD
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+16(FP)
MOVL $0, r2+20(FP)
CMPL AX, $-1
JNE ok3
LEAL errbuf-128(SP), AX
MOVL AX, sysargs-144(SP)
MOVL $128, sysargs1-140(SP)
MOVL $SYS_ERRSTR, AX
INT $64
CALL runtime路exitsyscall(SB)
MOVL sysargs-144(SP), AX
MOVL AX, errbuf-148(SP)
CALL runtime路gostring(SB)
LEAL str-144(SP), SI
JMP copyresult3
ok3:
CALL runtime路exitsyscall(SB)
LEAL 路emptystring(SB), SI
copyresult3:
LEAL err+24(FP), DI
CLD
MOVSL
MOVSL
RET
TEXT 路Syscall6(SB),NOSPLIT,$148-44
NO_LOCAL_POINTERS
CALL runtime路entersyscall(SB)
MOVL trap+0(FP), AX // syscall entry
// copy args down
LEAL a1+4(FP), SI
LEAL sysargs-144(SP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+28(FP)
MOVL $0, r2+32(FP)
CMPL AX, $-1
JNE ok4
LEAL errbuf-128(SP), AX
MOVL AX, sysargs-144(SP)
MOVL $128, sysargs1-140(SP)
MOVL $SYS_ERRSTR, AX
INT $64
CALL runtime路exitsyscall(SB)
MOVL sysargs-144(SP), AX
MOVL AX, errbuf-148(SP)
CALL runtime路gostring(SB)
LEAL str-144(SP), SI
JMP copyresult4
ok4:
CALL runtime路exitsyscall(SB)
LEAL 路emptystring(SB), SI
copyresult4:
LEAL err+36(FP), DI
CLD
MOVSL
MOVSL
RET
TEXT 路RawSyscall(SB),NOSPLIT,$0-28
MOVL trap+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL trap+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+16(FP)
MOVL AX, r2+20(FP)
MOVL AX, err+24(FP)
RET
TEXT 路RawSyscall6(SB),NOSPLIT,$0-40
MOVL trap+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL trap+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
INT $64
MOVL AX, r1+28(FP)
MOVL AX, r2+32(FP)
MOVL AX, err+36(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,$24-36
NO_LOCAL_POINTERS
LEAL newoffset+20(FP), AX
MOVL AX, placeholder+0(FP)
// copy args down
LEAL placeholder+0(FP), SI
LEAL sysargs-20(SP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVL $SYS_SEEK, AX // syscall entry
INT $64
CMPL AX, $-1
JNE ok6
MOVL AX, newoffset_lo+20(FP)
MOVL AX, newoffset_hi+24(FP)
CALL syscall路errstr(SB)
MOVL SP, SI
JMP copyresult6
ok6:
LEAL 路emptystring(SB), SI
copyresult6:
LEAL err+28(FP), DI
CLD
MOVSL
MOVSL
RET
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