| // 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 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 */ |
| |
| TEXT ·Syscall(SB),NOSPLIT,$168-64 |
| NO_LOCAL_POINTERS |
| CALL runtime·entersyscall<ABIInternal>(SB) |
| MOVQ trap+0(FP), BP // syscall entry |
| // copy args down |
| LEAQ a1+8(FP), SI |
| LEAQ sysargs-160(SP), DI |
| CLD |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| SYSCALL |
| MOVQ AX, r1+32(FP) |
| MOVQ $0, r2+40(FP) |
| CMPL AX, $-1 |
| JNE ok3 |
| |
| LEAQ errbuf-128(SP), AX |
| MOVQ AX, sysargs-160(SP) |
| MOVQ $128, sysargs1-152(SP) |
| MOVQ $SYS_ERRSTR, BP |
| SYSCALL |
| CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set |
| MOVQ sysargs-160(SP), AX |
| MOVQ AX, errbuf-168(SP) |
| CALL runtime·gostring(SB) |
| LEAQ str-160(SP), SI |
| JMP copyresult3 |
| |
| ok3: |
| CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set |
| LEAQ ·emptystring(SB), SI |
| |
| copyresult3: |
| LEAQ err+48(FP), DI |
| |
| CLD |
| MOVSQ |
| MOVSQ |
| |
| RET |
| |
| TEXT ·Syscall6(SB),NOSPLIT,$168-88 |
| NO_LOCAL_POINTERS |
| CALL runtime·entersyscall<ABIInternal>(SB) |
| MOVQ trap+0(FP), BP // syscall entry |
| // copy args down |
| LEAQ a1+8(FP), SI |
| LEAQ sysargs-160(SP), DI |
| CLD |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| SYSCALL |
| MOVQ AX, r1+56(FP) |
| MOVQ $0, r2+64(FP) |
| CMPL AX, $-1 |
| JNE ok4 |
| |
| LEAQ errbuf-128(SP), AX |
| MOVQ AX, sysargs-160(SP) |
| MOVQ $128, sysargs1-152(SP) |
| MOVQ $SYS_ERRSTR, BP |
| SYSCALL |
| CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set |
| MOVQ sysargs-160(SP), AX |
| MOVQ AX, errbuf-168(SP) |
| CALL runtime·gostring(SB) |
| LEAQ str-160(SP), SI |
| JMP copyresult4 |
| |
| ok4: |
| CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set |
| LEAQ ·emptystring(SB), SI |
| |
| copyresult4: |
| LEAQ err+72(FP), DI |
| |
| CLD |
| MOVSQ |
| MOVSQ |
| |
| RET |
| |
| TEXT ·RawSyscall(SB),NOSPLIT,$0-56 |
| MOVQ trap+0(FP), BP // syscall entry |
| // slide args down on top of system call number |
| LEAQ a1+8(FP), SI |
| LEAQ trap+0(FP), DI |
| CLD |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| SYSCALL |
| MOVQ AX, r1+32(FP) |
| MOVQ AX, r2+40(FP) |
| MOVQ AX, err+48(FP) |
| RET |
| |
| TEXT ·RawSyscall6(SB),NOSPLIT,$0-80 |
| MOVQ trap+0(FP), BP // syscall entry |
| // slide args down on top of system call number |
| LEAQ a1+8(FP), SI |
| LEAQ trap+0(FP), DI |
| CLD |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| SYSCALL |
| MOVQ AX, r1+56(FP) |
| MOVQ AX, r2+64(FP) |
| MOVQ AX, err+72(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,$48-56 |
| NO_LOCAL_POINTERS |
| LEAQ newoffset+32(FP), AX |
| MOVQ AX, placeholder+0(FP) |
| |
| // copy args down |
| LEAQ placeholder+0(FP), SI |
| LEAQ sysargs-40(SP), DI |
| CLD |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| MOVSQ |
| MOVQ $SYS_SEEK, BP // syscall entry |
| SYSCALL |
| |
| CMPL AX, $-1 |
| JNE ok6 |
| MOVQ AX, newoffset+32(FP) |
| |
| CALL syscall·errstr(SB) |
| MOVQ SP, SI |
| JMP copyresult6 |
| |
| ok6: |
| LEAQ ·emptystring(SB), SI |
| |
| copyresult6: |
| LEAQ err+40(FP), DI |
| |
| CLD |
| MOVSQ |
| MOVSQ |
| RET |
