| // 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 ·Syscall(SB),NOSPLIT,$148-32 |
| NO_LOCAL_POINTERS |
| CALL runtime·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·exitsyscall(SB) |
| MOVL sysargs-144(SP), AX |
| MOVL AX, errbuf-148(SP) |
| CALL runtime·gostring(SB) |
| LEAL str-144(SP), SI |
| JMP copyresult3 |
| |
| ok3: |
| CALL runtime·exitsyscall(SB) |
| LEAL ·emptystring(SB), SI |
| |
| copyresult3: |
| LEAL err+24(FP), DI |
| |
| CLD |
| MOVSL |
| MOVSL |
| |
| RET |
| |
| TEXT ·Syscall6(SB),NOSPLIT,$148-44 |
| NO_LOCAL_POINTERS |
| CALL runtime·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·exitsyscall(SB) |
| MOVL sysargs-144(SP), AX |
| MOVL AX, errbuf-148(SP) |
| CALL runtime·gostring(SB) |
| LEAL str-144(SP), SI |
| JMP copyresult4 |
| |
| ok4: |
| CALL runtime·exitsyscall(SB) |
| LEAL ·emptystring(SB), SI |
| |
| copyresult4: |
| LEAL err+36(FP), DI |
| |
| CLD |
| MOVSL |
| MOVSL |
| |
| RET |
| |
| TEXT ·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 ·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 ·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·errstr(SB) |
| MOVL SP, SI |
| JMP copyresult6 |
| |
| ok6: |
| LEAL ·emptystring(SB), SI |
| |
| copyresult6: |
| LEAL err+28(FP), DI |
| |
| CLD |
| MOVSL |
| MOVSL |
| RET |
