mirror of https://go.googlesource.com/go
177 lines
3.4 KiB
ArmAsm
177 lines
3.4 KiB
ArmAsm
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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#include "funcdata.h"
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//
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// System call support for Plan 9
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//
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//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string)
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//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string)
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//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
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//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
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#define SYS_ERRSTR 41 /* from zsysnum_plan9.go */
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TEXT ·Syscall(SB),NOSPLIT,$168-64
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NO_LOCAL_POINTERS
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CALL runtime·entersyscall<ABIInternal>(SB)
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MOVQ trap+0(FP), BP // syscall entry
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// copy args down
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LEAQ a1+8(FP), SI
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LEAQ sysargs-160(SP), DI
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CLD
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MOVSQ
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MOVSQ
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MOVSQ
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SYSCALL
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MOVQ AX, r1+32(FP)
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MOVQ $0, r2+40(FP)
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CMPL AX, $-1
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JNE ok3
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LEAQ errbuf-128(SP), AX
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MOVQ AX, sysargs-160(SP)
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MOVQ $128, sysargs1-152(SP)
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MOVQ $SYS_ERRSTR, BP
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SYSCALL
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CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
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MOVQ sysargs-160(SP), AX
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MOVQ AX, errbuf-168(SP)
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CALL runtime·gostring(SB)
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LEAQ str-160(SP), SI
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JMP copyresult3
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ok3:
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CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
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LEAQ ·emptystring(SB), SI
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copyresult3:
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LEAQ err+48(FP), DI
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CLD
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MOVSQ
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MOVSQ
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RET
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TEXT ·Syscall6(SB),NOSPLIT,$168-88
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NO_LOCAL_POINTERS
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CALL runtime·entersyscall<ABIInternal>(SB)
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MOVQ trap+0(FP), BP // syscall entry
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// copy args down
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LEAQ a1+8(FP), SI
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LEAQ sysargs-160(SP), DI
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CLD
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MOVSQ
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MOVSQ
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MOVSQ
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MOVSQ
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MOVSQ
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MOVSQ
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SYSCALL
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MOVQ AX, r1+56(FP)
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MOVQ $0, r2+64(FP)
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CMPL AX, $-1
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JNE ok4
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LEAQ errbuf-128(SP), AX
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MOVQ AX, sysargs-160(SP)
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MOVQ $128, sysargs1-152(SP)
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MOVQ $SYS_ERRSTR, BP
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SYSCALL
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CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
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MOVQ sysargs-160(SP), AX
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MOVQ AX, errbuf-168(SP)
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CALL runtime·gostring(SB)
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LEAQ str-160(SP), SI
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JMP copyresult4
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ok4:
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CALL runtime·exitsyscall(SB) // call via ABI wrapper, ensuring ABIInternal fixed registers are set
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LEAQ ·emptystring(SB), SI
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copyresult4:
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LEAQ err+72(FP), DI
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CLD
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MOVSQ
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MOVSQ
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RET
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TEXT ·RawSyscall(SB),NOSPLIT,$0-56
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MOVQ trap+0(FP), BP // syscall entry
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// slide args down on top of system call number
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LEAQ a1+8(FP), SI
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LEAQ trap+0(FP), DI
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CLD
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MOVSQ
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MOVSQ
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MOVSQ
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SYSCALL
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MOVQ AX, r1+32(FP)
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MOVQ AX, r2+40(FP)
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MOVQ AX, err+48(FP)
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RET
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TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
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MOVQ trap+0(FP), BP // syscall entry
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// slide args down on top of system call number
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LEAQ a1+8(FP), SI
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LEAQ trap+0(FP), DI
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CLD
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MOVSQ
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MOVSQ
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MOVSQ
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MOVSQ
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MOVSQ
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MOVSQ
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SYSCALL
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MOVQ AX, r1+56(FP)
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MOVQ AX, r2+64(FP)
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MOVQ AX, err+72(FP)
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RET
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#define SYS_SEEK 39 /* from zsysnum_plan9.go */
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//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
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TEXT ·seek(SB),NOSPLIT,$48-56
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NO_LOCAL_POINTERS
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LEAQ newoffset+32(FP), AX
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MOVQ AX, placeholder+0(FP)
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// copy args down
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LEAQ placeholder+0(FP), SI
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LEAQ sysargs-40(SP), DI
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CLD
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MOVSQ
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MOVSQ
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MOVSQ
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MOVSQ
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MOVSQ
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MOVQ $SYS_SEEK, BP // syscall entry
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SYSCALL
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CMPL AX, $-1
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JNE ok6
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MOVQ AX, newoffset+32(FP)
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CALL syscall·errstr(SB)
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MOVQ SP, SI
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JMP copyresult6
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ok6:
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LEAQ ·emptystring(SB), SI
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copyresult6:
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LEAQ err+40(FP), DI
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CLD
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MOVSQ
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MOVSQ
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RET
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