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 // TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP) 6 // so that go vet can check that they are correct. 7 8 #include "textflag.h" 9 #include "funcdata.h" 10 11 // 12 // System call support for Plan 9 13 // 14 15 //func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string) 16 //func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string) 17 //func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr) 18 //func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr) 19 20 TEXT Syscall(SB),NOSPLIT,$0-64 21 CALL runtimeentersyscall(SB) 22 MOVQ 8(SP), BP // syscall entry 23 // slide args down on top of system call number 24 LEAQ 16(SP), SI 25 LEAQ 8(SP), DI 26 CLD 27 MOVSQ 28 MOVSQ 29 MOVSQ 30 SYSCALL 31 MOVQ AX, r1+40(SP) 32 MOVQ $0, r2+48(SP) 33 CMPL AX, $-1 34 JNE ok3 35 36 SUBQ $16, SP 37 CALL runtimeerrstr(SB) 38 MOVQ SP, SI 39 ADDQ $16, SP 40 JMP copyresult3 41 42 ok3: 43 LEAQ runtimeemptystring(SB), SI 44 45 copyresult3: 46 LEAQ err+56(SP), DI 47 48 CLD 49 MOVSQ 50 MOVSQ 51 52 CALL runtimeexitsyscall(SB) 53 RET 54 55 TEXT Syscall6(SB),NOSPLIT,$0-88 56 CALL runtimeentersyscall(SB) 57 MOVQ 8(SP), BP // syscall entry 58 // slide args down on top of system call number 59 LEAQ 16(SP), SI 60 LEAQ 8(SP), DI 61 CLD 62 MOVSQ 63 MOVSQ 64 MOVSQ 65 MOVSQ 66 MOVSQ 67 MOVSQ 68 SYSCALL 69 MOVQ AX, r1+64(SP) 70 MOVQ $0, r2+72(SP) 71 CMPL AX, $-1 72 JNE ok4 73 74 SUBQ $16, SP 75 CALL runtimeerrstr(SB) 76 MOVQ SP, SI 77 ADDQ $16, SP 78 JMP copyresult4 79 80 ok4: 81 LEAQ runtimeemptystring(SB), SI 82 83 copyresult4: 84 LEAQ err+80(SP), DI 85 86 CLD 87 MOVSQ 88 MOVSQ 89 90 CALL runtimeexitsyscall(SB) 91 RET 92 93 TEXT RawSyscall(SB),NOSPLIT,$0-56 94 MOVQ 8(SP), BP // syscall entry 95 // slide args down on top of system call number 96 LEAQ 16(SP), SI 97 LEAQ 8(SP), DI 98 CLD 99 MOVSQ 100 MOVSQ 101 MOVSQ 102 SYSCALL 103 MOVQ AX, r1+40(SP) 104 MOVQ AX, r2+48(SP) 105 MOVQ AX, err+56(SP) 106 RET 107 108 TEXT RawSyscall6(SB),NOSPLIT,$0-80 109 MOVQ 8(SP), BP // syscall entry 110 // slide args down on top of system call number 111 LEAQ 16(SP), SI 112 LEAQ 8(SP), DI 113 CLD 114 MOVSQ 115 MOVSQ 116 MOVSQ 117 MOVSQ 118 MOVSQ 119 MOVSQ 120 SYSCALL 121 MOVQ AX, r1+64(SP) 122 MOVQ AX, r2+72(SP) 123 MOVQ AX, err+80(SP) 124 RET 125 126 #define SYS_SEEK 39 /* from zsysnum_plan9_amd64.go */ 127 128 //func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string) 129 TEXT seek(SB),NOSPLIT,$0-56 130 LEAQ newoffset+40(SP), AX 131 MOVQ AX, placeholder+8(SP) 132 133 MOVQ $SYS_SEEK, BP // syscall entry 134 SYSCALL 135 136 CMPL AX, $-1 137 JNE ok6 138 MOVQ $-1, newoffset+40(SP) 139 140 SUBQ $16, SP 141 CALL syscallerrstr(SB) 142 MOVQ SP, SI 143 ADDQ $16, SP 144 JMP copyresult6 145 146 ok6: 147 LEAQ runtimeemptystring(SB), SI 148 149 copyresult6: 150 LEAQ err+48(SP), DI 151 152 CLD 153 MOVSQ 154 MOVSQ 155 RET 156 157 //func exit(code int) 158 // Import runtimeexit for cleanly exiting. 159 TEXT exit(SB),NOSPLIT,$8-8 160 NO_LOCAL_POINTERS 161 MOVQ code+0(FP), AX 162 MOVQ AX, 0(SP) 163 CALL runtimeexit(SB) 164 RET 165
