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Diffstat (limited to 'src/syscall/asm_plan9_amd64.s')
| -rw-r--r-- | src/syscall/asm_plan9_amd64.s | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/src/syscall/asm_plan9_amd64.s b/src/syscall/asm_plan9_amd64.s new file mode 100644 index 0000000..0641513 --- /dev/null +++ b/src/syscall/asm_plan9_amd64.s @@ -0,0 +1,176 @@ +// 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 |