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 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 TEXT Syscall(SB),NOSPLIT,$0-64 18 CALL runtimeentersyscall(SB) 19 MOVQ trap+0(FP), BP // syscall entry 20 // slide args down on top of system call number 21 LEAQ a1+8(FP), SI 22 LEAQ trap+0(FP), DI 23 CLD 24 MOVSQ 25 MOVSQ 26 MOVSQ 27 SYSCALL 28 MOVQ AX, r1+32(FP) 29 MOVQ $0, r2+40(FP) 30 CMPL AX, $-1 31 JNE ok3 32 33 SUBQ $16, SP 34 CALL runtimeerrstr(SB) 35 MOVQ SP, SI 36 ADDQ $16, SP 37 JMP copyresult3 38 39 ok3: 40 LEAQ emptystring(SB), SI 41 42 copyresult3: 43 LEAQ err+48(FP), DI 44 45 CLD 46 MOVSQ 47 MOVSQ 48 49 CALL runtimeexitsyscall(SB) 50 RET 51 52 TEXT Syscall6(SB),NOSPLIT,$0-88 53 CALL runtimeentersyscall(SB) 54 MOVQ trap+0(FP), BP // syscall entry 55 // slide args down on top of system call number 56 LEAQ a1+8(FP), SI 57 LEAQ trap+0(FP), DI 58 CLD 59 MOVSQ 60 MOVSQ 61 MOVSQ 62 MOVSQ 63 MOVSQ 64 MOVSQ 65 SYSCALL 66 MOVQ AX, r1+56(FP) 67 MOVQ $0, r2+64(FP) 68 CMPL AX, $-1 69 JNE ok4 70 71 SUBQ $16, SP 72 CALL runtimeerrstr(SB) 73 MOVQ SP, SI 74 ADDQ $16, SP 75 JMP copyresult4 76 77 ok4: 78 LEAQ emptystring(SB), SI 79 80 copyresult4: 81 LEAQ err+72(FP), DI 82 83 CLD 84 MOVSQ 85 MOVSQ 86 87 CALL runtimeexitsyscall(SB) 88 RET 89 90 TEXT RawSyscall(SB),NOSPLIT,$0-56 91 MOVQ trap+0(FP), BP // syscall entry 92 // slide args down on top of system call number 93 LEAQ a1+8(FP), SI 94 LEAQ trap+0(FP), DI 95 CLD 96 MOVSQ 97 MOVSQ 98 MOVSQ 99 SYSCALL 100 MOVQ AX, r1+32(FP) 101 MOVQ AX, r2+40(FP) 102 MOVQ AX, err+48(FP) 103 RET 104 105 TEXT RawSyscall6(SB),NOSPLIT,$0-80 106 MOVQ trap+0(FP), BP // syscall entry 107 // slide args down on top of system call number 108 LEAQ a1+8(FP), SI 109 LEAQ trap+0(FP), DI 110 CLD 111 MOVSQ 112 MOVSQ 113 MOVSQ 114 MOVSQ 115 MOVSQ 116 MOVSQ 117 SYSCALL 118 MOVQ AX, r1+56(FP) 119 MOVQ AX, r2+64(FP) 120 MOVQ AX, err+72(FP) 121 RET 122 123 #define SYS_SEEK 39 /* from zsysnum_plan9_amd64.go */ 124 125 //func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string) 126 TEXT seek(SB),NOSPLIT,$0-56 127 LEAQ newoffset+32(FP), AX 128 MOVQ AX, placeholder+0(FP) 129 130 MOVQ $SYS_SEEK, BP // syscall entry 131 SYSCALL 132 133 CMPL AX, $-1 134 JNE ok6 135 MOVQ $-1, newoffset+32(FP) 136 137 SUBQ $16, SP 138 CALL syscallerrstr(SB) 139 MOVQ SP, SI 140 ADDQ $16, SP 141 JMP copyresult6 142 143 ok6: 144 LEAQ emptystring(SB), SI 145 146 copyresult6: 147 LEAQ err+40(FP), DI 148 149 CLD 150 MOVSQ 151 MOVSQ 152 RET 153
