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-rw-r--r--src/syscall/asm_plan9_amd64.s176
1 files changed, 176 insertions, 0 deletions
diff --git a/src/syscall/asm_plan9_amd64.s b/src/syscall/asm_plan9_amd64.s
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+++ 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(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)
+ 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)
+ 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(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)
+ 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)
+ 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