1 // Copyright 2009 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 #include "textflag.h" 6 #include "funcdata.h" 7 8 // 9 // System call support for 386, Plan 9 10 // 11 12 //func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string) 13 //func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string) 14 //func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr) 15 //func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) 16 17 // Trap # in AX, args on stack above caller pc. 18 TEXT Syscall(SB),NOSPLIT,$0-32 19 CALL runtimeentersyscall(SB) 20 MOVL trap+0(FP), AX // syscall entry 21 // slide args down on top of system call number 22 LEAL a1+4(FP), SI 23 LEAL trap+0(FP), DI 24 CLD 25 MOVSL 26 MOVSL 27 MOVSL 28 INT $64 29 MOVL AX, r1+16(FP) 30 MOVL $0, r2+20(FP) 31 CMPL AX, $-1 32 JNE ok3 33 34 SUBL $8, SP 35 CALL runtimeerrstr(SB) 36 MOVL SP, SI 37 ADDL $8, SP 38 JMP copyresult3 39 40 ok3: 41 LEAL emptystring(SB), SI 42 43 copyresult3: 44 LEAL err+24(FP), DI 45 46 CLD 47 MOVSL 48 MOVSL 49 50 CALL runtimeexitsyscall(SB) 51 RET 52 53 TEXT Syscall6(SB),NOSPLIT,$0-44 54 CALL runtimeentersyscall(SB) 55 MOVL trap+0(FP), AX // syscall entry 56 // slide args down on top of system call number 57 LEAL a1+4(FP), SI 58 LEAL trap+0(FP), DI 59 CLD 60 MOVSL 61 MOVSL 62 MOVSL 63 MOVSL 64 MOVSL 65 MOVSL 66 INT $64 67 MOVL AX, r1+28(FP) 68 MOVL $0, r2+32(FP) 69 CMPL AX, $-1 70 JNE ok4 71 72 SUBL $8, SP 73 CALL runtimeerrstr(SB) 74 MOVL SP, SI 75 ADDL $8, SP 76 JMP copyresult4 77 78 ok4: 79 LEAL emptystring(SB), SI 80 81 copyresult4: 82 LEAL err+36(FP), DI 83 84 CLD 85 MOVSL 86 MOVSL 87 88 CALL runtimeexitsyscall(SB) 89 RET 90 91 TEXT RawSyscall(SB),NOSPLIT,$0-28 92 MOVL trap+0(FP), AX // syscall entry 93 // slide args down on top of system call number 94 LEAL a1+4(FP), SI 95 LEAL trap+0(FP), DI 96 CLD 97 MOVSL 98 MOVSL 99 MOVSL 100 INT $64 101 MOVL AX, r1+16(FP) 102 MOVL AX, r2+20(FP) 103 MOVL AX, err+24(FP) 104 RET 105 106 TEXT RawSyscall6(SB),NOSPLIT,$0-40 107 MOVL trap+0(FP), AX // syscall entry 108 // slide args down on top of system call number 109 LEAL a1+4(FP), SI 110 LEAL trap+0(FP), DI 111 CLD 112 MOVSL 113 MOVSL 114 MOVSL 115 MOVSL 116 MOVSL 117 MOVSL 118 INT $64 119 MOVL AX, r1+28(FP) 120 MOVL AX, r2+32(FP) 121 MOVL AX, err+36(FP) 122 RET 123 124 #define SYS_SEEK 39 /* from zsysnum_plan9_386.go */ 125 126 //func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string) 127 TEXT seek(SB),NOSPLIT,$0-36 128 LEAL newoffset+20(FP), AX 129 MOVL AX, placeholder+0(FP) 130 131 MOVL $SYS_SEEK, AX // syscall entry 132 INT $64 133 134 CMPL AX, $-1 135 JNE ok6 136 MOVL AX, newoffset_lo+20(FP) 137 MOVL AX, newoffset_hi+24(FP) 138 139 SUBL $8, SP 140 CALL syscallerrstr(SB) 141 MOVL SP, SI 142 ADDL $8, SP 143 JMP copyresult6 144 145 ok6: 146 LEAL emptystring(SB), SI 147 148 copyresult6: 149 LEAL err+28(FP), DI 150 151 CLD 152 MOVSL 153 MOVSL 154 RET 155
