diff options
Diffstat (limited to 'src/syscall/asm_plan9_386.s')
| -rw-r--r-- | src/syscall/asm_plan9_386.s | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/src/syscall/asm_plan9_386.s b/src/syscall/asm_plan9_386.s new file mode 100644 index 000000000..fc13640b9 --- /dev/null +++ b/src/syscall/asm_plan9_386.s @@ -0,0 +1,166 @@ +// 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. + +// TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP) +// so that go vet can check that they are correct. + +#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) + +// Trap # in AX, args on stack above caller pc. +TEXT ·Syscall(SB),NOSPLIT,$0-32 + CALL runtime·entersyscall(SB) + MOVL 4(SP), AX // syscall entry + // slide args down on top of system call number + LEAL 8(SP), SI + LEAL 4(SP), DI + CLD + MOVSL + MOVSL + MOVSL + INT $64 + MOVL AX, r1+20(SP) + MOVL $0, r2+24(SP) + CMPL AX, $-1 + JNE ok3 + + SUBL $8, SP + CALL runtime·errstr(SB) + MOVL SP, SI + ADDL $8, SP + JMP copyresult3 + +ok3: + LEAL runtime·emptystring(SB), SI + +copyresult3: + LEAL err+28(SP), DI + + CLD + MOVSL + MOVSL + + CALL runtime·exitsyscall(SB) + RET + +TEXT ·Syscall6(SB),NOSPLIT,$0-44 + CALL runtime·entersyscall(SB) + MOVL 4(SP), AX // syscall entry + // slide args down on top of system call number + LEAL 8(SP), SI + LEAL 4(SP), DI + CLD + MOVSL + MOVSL + MOVSL + MOVSL + MOVSL + MOVSL + INT $64 + MOVL AX, r1+32(SP) + MOVL $0, r2+36(SP) + CMPL AX, $-1 + JNE ok4 + + SUBL $8, SP + CALL runtime·errstr(SB) + MOVL SP, SI + ADDL $8, SP + JMP copyresult4 + +ok4: + LEAL runtime·emptystring(SB), SI + +copyresult4: + LEAL err+40(SP), DI + + CLD + MOVSL + MOVSL + + CALL runtime·exitsyscall(SB) + RET + +TEXT ·RawSyscall(SB),NOSPLIT,$0-28 + MOVL 4(SP), AX // syscall entry + // slide args down on top of system call number + LEAL 8(SP), SI + LEAL 4(SP), DI + CLD + MOVSL + MOVSL + MOVSL + INT $64 + MOVL AX, r1+20(SP) + MOVL AX, r2+24(SP) + MOVL AX, err+28(SP) + RET + +TEXT ·RawSyscall6(SB),NOSPLIT,$0-40 + MOVL 4(SP), AX // syscall entry + // slide args down on top of system call number + LEAL 8(SP), SI + LEAL 4(SP), DI + CLD + MOVSL + MOVSL + MOVSL + MOVSL + MOVSL + MOVSL + INT $64 + MOVL AX, r1+32(SP) + MOVL AX, r2+36(SP) + MOVL AX, err+40(SP) + RET + +#define SYS_SEEK 39 /* from zsysnum_plan9_386.go */ + +//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string) +TEXT ·seek(SB),NOSPLIT,$0-36 + LEAL newoffset+24(SP), AX + MOVL AX, placeholder+4(SP) + + MOVL $SYS_SEEK, AX // syscall entry + INT $64 + + CMPL AX, $-1 + JNE ok6 + MOVL AX, 24(SP) // newoffset low + MOVL AX, 28(SP) // newoffset high + + SUBL $8, SP + CALL syscall·errstr(SB) + MOVL SP, SI + ADDL $8, SP + JMP copyresult6 + +ok6: + LEAL runtime·emptystring(SB), SI + +copyresult6: + LEAL err+32(SP), DI + + CLD + MOVSL + MOVSL + RET + +//func exit(code int) +// Import runtime·exit for cleanly exiting. +TEXT ·exit(SB),NOSPLIT,$4-4 + NO_LOCAL_POINTERS + MOVL code+0(FP), AX + MOVL AX, 0(SP) + CALL runtime·exit(SB) + RET |