// Copyright 2013 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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//
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// System calls and other sys.stuff for ARM, NetBSD
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// /usr/src/sys/kern/syscalls.master for syscall numbers.
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//
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#include "go_asm.h"
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#include "go_tls.h"
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#include "textflag.h"
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// Exit the entire program (like C exit)
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TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
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MOVW code+0(FP), R0 // arg 1 exit status
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SWI $0xa00001
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MOVW.CS $0, R8 // crash on syscall failure
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MOVW.CS R8, (R8)
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RET
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// func exitThread(wait *uint32)
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TEXT runtime·exitThread(SB),NOSPLIT,$0-4
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MOVW wait+0(FP), R0
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// We're done using the stack.
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MOVW $0, R2
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storeloop:
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LDREX (R0), R4 // loads R4
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STREX R2, (R0), R1 // stores R2
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CMP $0, R1
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BNE storeloop
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SWI $0xa00136 // sys__lwp_exit
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MOVW $1, R8 // crash
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MOVW R8, (R8)
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JMP 0(PC)
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TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0
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MOVW name+0(FP), R0
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MOVW mode+4(FP), R1
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MOVW perm+8(FP), R2
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SWI $0xa00005
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MOVW.CS $-1, R0
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MOVW R0, ret+12(FP)
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RET
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TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0
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MOVW fd+0(FP), R0
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SWI $0xa00006
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MOVW.CS $-1, R0
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MOVW R0, ret+4(FP)
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RET
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TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0
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MOVW fd+0(FP), R0
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MOVW p+4(FP), R1
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MOVW n+8(FP), R2
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SWI $0xa00003
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MOVW.CS $-1, R0
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MOVW R0, ret+12(FP)
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RET
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TEXT runtime·write(SB),NOSPLIT|NOFRAME,$0
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MOVW fd+0(FP), R0 // arg 1 - fd
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MOVW p+4(FP), R1 // arg 2 - buf
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MOVW n+8(FP), R2 // arg 3 - nbyte
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SWI $0xa00004 // sys_write
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MOVW.CS $-1, R0
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MOVW R0, ret+12(FP)
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RET
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// int32 lwp_create(void *context, uintptr flags, void *lwpid)
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TEXT runtime·lwp_create(SB),NOSPLIT,$0
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MOVW ctxt+0(FP), R0
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MOVW flags+4(FP), R1
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MOVW lwpid+8(FP), R2
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SWI $0xa00135 // sys__lwp_create
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MOVW R0, ret+12(FP)
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RET
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TEXT runtime·osyield(SB),NOSPLIT,$0
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SWI $0xa0015e // sys_sched_yield
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RET
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TEXT runtime·lwp_park(SB),NOSPLIT,$8
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MOVW clockid+0(FP), R0 // arg 1 - clock_id
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MOVW flags+4(FP), R1 // arg 2 - flags
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MOVW ts+8(FP), R2 // arg 3 - ts
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MOVW unpark+12(FP), R3 // arg 4 - unpark
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MOVW hint+16(FP), R4 // arg 5 - hint
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MOVW R4, 4(R13)
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MOVW unparkhint+20(FP), R5 // arg 6 - unparkhint
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MOVW R5, 8(R13)
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SWI $0xa001de // sys__lwp_park
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MOVW R0, ret+24(FP)
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RET
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TEXT runtime·lwp_unpark(SB),NOSPLIT,$0
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MOVW lwp+0(FP), R0 // arg 1 - lwp
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MOVW hint+4(FP), R1 // arg 2 - hint
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SWI $0xa00141 // sys__lwp_unpark
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MOVW R0, ret+8(FP)
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RET
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TEXT runtime·lwp_self(SB),NOSPLIT,$0
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SWI $0xa00137 // sys__lwp_self
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MOVW R0, ret+0(FP)
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RET
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TEXT runtime·lwp_tramp(SB),NOSPLIT,$0
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MOVW R0, g_m(R1)
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MOVW R1, g
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BL runtime·emptyfunc(SB) // fault if stack check is wrong
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BL (R2)
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MOVW $2, R8 // crash (not reached)
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MOVW R8, (R8)
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RET
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TEXT runtime·usleep(SB),NOSPLIT,$16
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MOVW usec+0(FP), R0
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CALL runtime·usplitR0(SB)
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// 0(R13) is the saved LR, don't use it
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MOVW R0, 4(R13) // tv_sec.low
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MOVW $0, R0
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MOVW R0, 8(R13) // tv_sec.high
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MOVW $1000, R2
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MUL R1, R2
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MOVW R2, 12(R13) // tv_nsec
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MOVW $4(R13), R0 // arg 1 - rqtp
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MOVW $0, R1 // arg 2 - rmtp
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SWI $0xa001ae // sys_nanosleep
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RET
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TEXT runtime·raise(SB),NOSPLIT,$16
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SWI $0xa00137 // sys__lwp_self, the returned R0 is arg 1
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MOVW sig+0(FP), R1 // arg 2 - signal
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SWI $0xa0013e // sys__lwp_kill
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RET
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TEXT runtime·raiseproc(SB),NOSPLIT,$16
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SWI $0xa00014 // sys_getpid, the returned R0 is arg 1
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MOVW sig+0(FP), R1 // arg 2 - signal
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SWI $0xa00025 // sys_kill
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RET
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TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0
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MOVW mode+0(FP), R0 // arg 1 - which
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MOVW new+4(FP), R1 // arg 2 - itv
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MOVW old+8(FP), R2 // arg 3 - oitv
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SWI $0xa001a9 // sys_setitimer
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RET
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// func walltime() (sec int64, nsec int32)
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TEXT runtime·walltime(SB), NOSPLIT, $32
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MOVW $0, R0 // CLOCK_REALTIME
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MOVW $8(R13), R1
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SWI $0xa001ab // clock_gettime
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MOVW 8(R13), R0 // sec.low
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MOVW 12(R13), R1 // sec.high
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MOVW 16(R13), R2 // nsec
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MOVW R0, sec_lo+0(FP)
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MOVW R1, sec_hi+4(FP)
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MOVW R2, nsec+8(FP)
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RET
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// int64 nanotime(void) so really
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// void nanotime(int64 *nsec)
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TEXT runtime·nanotime(SB), NOSPLIT, $32
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MOVW $3, R0 // CLOCK_MONOTONIC
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MOVW $8(R13), R1
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SWI $0xa001ab // clock_gettime
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MOVW 8(R13), R0 // sec.low
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MOVW 12(R13), R4 // sec.high
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MOVW 16(R13), R2 // nsec
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MOVW $1000000000, R3
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MULLU R0, R3, (R1, R0)
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MUL R3, R4
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ADD.S R2, R0
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ADC R4, R1
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MOVW R0, ret_lo+0(FP)
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MOVW R1, ret_hi+4(FP)
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RET
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TEXT runtime·getcontext(SB),NOSPLIT|NOFRAME,$0
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MOVW ctxt+0(FP), R0 // arg 1 - context
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SWI $0xa00133 // sys_getcontext
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MOVW.CS $0, R8 // crash on syscall failure
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MOVW.CS R8, (R8)
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RET
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TEXT runtime·sigprocmask(SB),NOSPLIT,$0
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MOVW how+0(FP), R0 // arg 1 - how
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MOVW new+4(FP), R1 // arg 2 - set
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MOVW old+8(FP), R2 // arg 3 - oset
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SWI $0xa00125 // sys_sigprocmask
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MOVW.CS $0, R8 // crash on syscall failure
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MOVW.CS R8, (R8)
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RET
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TEXT runtime·sigreturn_tramp(SB),NOSPLIT|NOFRAME,$0
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// on entry, SP points to siginfo, we add sizeof(ucontext)
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// to SP to get a pointer to ucontext.
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ADD $0x80, R13, R0 // 0x80 == sizeof(UcontextT)
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SWI $0xa00134 // sys_setcontext
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// something failed, we have to exit
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MOVW $0x4242, R0 // magic return number
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SWI $0xa00001 // sys_exit
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B -2(PC) // continue exit
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TEXT runtime·sigaction(SB),NOSPLIT,$4
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MOVW sig+0(FP), R0 // arg 1 - signum
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MOVW new+4(FP), R1 // arg 2 - nsa
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MOVW old+8(FP), R2 // arg 3 - osa
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MOVW $runtime·sigreturn_tramp(SB), R3 // arg 4 - tramp
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MOVW $2, R4 // arg 5 - vers
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MOVW R4, 4(R13)
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ADD $4, R13 // pass arg 5 on stack
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SWI $0xa00154 // sys___sigaction_sigtramp
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SUB $4, R13
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MOVW.CS $3, R8 // crash on syscall failure
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MOVW.CS R8, (R8)
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RET
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TEXT runtime·sigfwd(SB),NOSPLIT,$0-16
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MOVW sig+4(FP), R0
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MOVW info+8(FP), R1
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MOVW ctx+12(FP), R2
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MOVW fn+0(FP), R11
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MOVW R13, R4
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SUB $24, R13
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BIC $0x7, R13 // alignment for ELF ABI
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BL (R11)
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MOVW R4, R13
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RET
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TEXT runtime·sigtramp(SB),NOSPLIT,$12
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// this might be called in external code context,
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// where g is not set.
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// first save R0, because runtime·load_g will clobber it
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MOVW R0, 4(R13) // signum
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MOVB runtime·iscgo(SB), R0
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CMP $0, R0
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BL.NE runtime·load_g(SB)
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MOVW R1, 8(R13)
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MOVW R2, 12(R13)
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BL runtime·sigtrampgo(SB)
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RET
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TEXT runtime·mmap(SB),NOSPLIT,$12
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MOVW addr+0(FP), R0 // arg 1 - addr
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MOVW n+4(FP), R1 // arg 2 - len
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MOVW prot+8(FP), R2 // arg 3 - prot
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MOVW flags+12(FP), R3 // arg 4 - flags
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// arg 5 (fid) and arg6 (offset_lo, offset_hi) are passed on stack
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// note the C runtime only passes the 32-bit offset_lo to us
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MOVW fd+16(FP), R4 // arg 5
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MOVW R4, 4(R13)
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MOVW off+20(FP), R5 // arg 6 lower 32-bit
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MOVW R5, 8(R13)
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MOVW $0, R6 // higher 32-bit for arg 6
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MOVW R6, 12(R13)
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ADD $4, R13 // pass arg 5 and arg 6 on stack
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SWI $0xa000c5 // sys_mmap
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SUB $4, R13
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MOVW $0, R1
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MOVW.CS R0, R1 // if error, move to R1
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MOVW.CS $0, R0
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MOVW R0, p+24(FP)
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MOVW R1, err+28(FP)
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RET
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TEXT runtime·munmap(SB),NOSPLIT,$0
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MOVW addr+0(FP), R0 // arg 1 - addr
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MOVW n+4(FP), R1 // arg 2 - len
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SWI $0xa00049 // sys_munmap
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MOVW.CS $0, R8 // crash on syscall failure
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MOVW.CS R8, (R8)
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RET
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TEXT runtime·madvise(SB),NOSPLIT,$0
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MOVW addr+0(FP), R0 // arg 1 - addr
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MOVW n+4(FP), R1 // arg 2 - len
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MOVW flags+8(FP), R2 // arg 3 - behav
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SWI $0xa0004b // sys_madvise
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MOVW.CS $-1, R0
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MOVW R0, ret+12(FP)
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RET
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TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
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MOVW new+0(FP), R0 // arg 1 - nss
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MOVW old+4(FP), R1 // arg 2 - oss
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SWI $0xa00119 // sys___sigaltstack14
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MOVW.CS $0, R8 // crash on syscall failure
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MOVW.CS R8, (R8)
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RET
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TEXT runtime·sysctl(SB),NOSPLIT,$8
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MOVW mib+0(FP), R0 // arg 1 - name
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MOVW miblen+4(FP), R1 // arg 2 - namelen
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MOVW out+8(FP), R2 // arg 3 - oldp
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MOVW size+12(FP), R3 // arg 4 - oldlenp
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MOVW dst+16(FP), R4 // arg 5 - newp
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MOVW R4, 4(R13)
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MOVW ndst+20(FP), R4 // arg 6 - newlen
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MOVW R4, 8(R13)
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ADD $4, R13 // pass arg 5 and 6 on stack
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SWI $0xa000ca // sys___sysctl
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SUB $4, R13
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MOVW R0, ret+24(FP)
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RET
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// int32 runtime·kqueue(void)
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TEXT runtime·kqueue(SB),NOSPLIT,$0
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SWI $0xa00158 // sys_kqueue
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RSB.CS $0, R0
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MOVW R0, ret+0(FP)
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RET
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// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout)
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TEXT runtime·kevent(SB),NOSPLIT,$8
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MOVW kq+0(FP), R0 // kq
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MOVW ch+4(FP), R1 // changelist
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MOVW nch+8(FP), R2 // nchanges
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MOVW ev+12(FP), R3 // eventlist
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MOVW nev+16(FP), R4 // nevents
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MOVW R4, 4(R13)
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MOVW ts+20(FP), R4 // timeout
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MOVW R4, 8(R13)
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ADD $4, R13 // pass arg 5 and 6 on stack
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SWI $0xa001b3 // sys___kevent50
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RSB.CS $0, R0
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SUB $4, R13
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MOVW R0, ret+24(FP)
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RET
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// void runtime·closeonexec(int32 fd)
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TEXT runtime·closeonexec(SB),NOSPLIT,$0
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MOVW fd+0(FP), R0 // fd
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MOVW $2, R1 // F_SETFD
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MOVW $1, R2 // FD_CLOEXEC
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SWI $0xa0005c // sys_fcntl
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RET
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// TODO: this is only valid for ARMv7+
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TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
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B runtime·armPublicationBarrier(SB)
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TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
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MOVM.WP [R1, R2, R3, R12], (R13)
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SWI $0x00a0013c // _lwp_getprivate
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MOVM.IAW (R13), [R1, R2, R3, R12]
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RET
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