// 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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//
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// System calls and other sys.stuff for ARM, OpenBSD
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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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#define CLOCK_REALTIME $0
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#define CLOCK_MONOTONIC $3
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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 - status
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MOVW $1, R12 // sys_exit
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SWI $0
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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 // arg 1 - notdead
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MOVW $302, R12 // sys___threxit
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SWI $0
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MOVW.CS $1, R8 // crash on syscall failure
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MOVW.CS 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 // arg 1 - path
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MOVW mode+4(FP), R1 // arg 2 - mode
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MOVW perm+8(FP), R2 // arg 3 - perm
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MOVW $5, R12 // sys_open
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SWI $0
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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 // arg 1 - fd
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MOVW $6, R12 // sys_close
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SWI $0
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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 // 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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MOVW $3, R12 // sys_read
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SWI $0
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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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MOVW $4, R12 // sys_write
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SWI $0
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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·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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MOVW R0, 4(R13) // tv_sec - l32
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MOVW $0, R0
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MOVW R0, 8(R13) // tv_sec - h32
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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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MOVW $91, R12 // sys_nanosleep
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SWI $0
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RET
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TEXT runtime·raise(SB),NOSPLIT,$12
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MOVW $0x12B, R12
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SWI $0 // sys_getthrid
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// arg 1 - tid, already in R0
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MOVW sig+0(FP), R1 // arg 2 - signum
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MOVW $0, R2 // arg 3 - tcb
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MOVW $119, R12 // sys_thrkill
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SWI $0
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RET
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TEXT runtime·raiseproc(SB),NOSPLIT,$12
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MOVW $20, R12
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SWI $0 // sys_getpid
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// arg 1 - pid, already in R0
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MOVW sig+0(FP), R1 // arg 2 - signum
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MOVW $122, R12 // sys_kill
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SWI $0
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RET
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TEXT runtime·mmap(SB),NOSPLIT,$16
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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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MOVW fd+16(FP), R4 // arg 5 - fd (on stack)
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MOVW R4, 4(R13)
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MOVW $0, R5 // arg 6 - pad (on stack)
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MOVW R5, 8(R13)
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MOVW off+20(FP), R6 // arg 7 - offset (on stack)
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MOVW R6, 12(R13) // lower 32 bits (from Go runtime)
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MOVW $0, R7
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MOVW R7, 16(R13) // high 32 bits
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ADD $4, R13
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MOVW $197, R12 // sys_mmap
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SWI $0
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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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MOVW $73, R12 // sys_munmap
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SWI $0
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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 2 - flags
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MOVW $75, R12 // sys_madvise
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SWI $0
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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·setitimer(SB),NOSPLIT,$0
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MOVW mode+0(FP), R0 // arg 1 - mode
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MOVW new+4(FP), R1 // arg 2 - new value
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MOVW old+8(FP), R2 // arg 3 - old value
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MOVW $69, R12 // sys_setitimer
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SWI $0
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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 CLOCK_REALTIME, R0 // arg 1 - clock_id
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MOVW $8(R13), R1 // arg 2 - tp
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MOVW $87, R12 // sys_clock_gettime
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SWI $0
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MOVW 8(R13), R0 // sec - l32
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MOVW 12(R13), R1 // sec - h32
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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 CLOCK_MONOTONIC, R0 // arg 1 - clock_id
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MOVW $8(R13), R1 // arg 2 - tp
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MOVW $87, R12 // sys_clock_gettime
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SWI $0
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MOVW 8(R13), R0 // sec - l32
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MOVW 12(R13), R4 // sec - h32
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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·sigaction(SB),NOSPLIT,$0
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MOVW sig+0(FP), R0 // arg 1 - signum
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MOVW new+4(FP), R1 // arg 2 - new sigaction
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MOVW old+8(FP), R2 // arg 3 - old sigaction
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MOVW $46, R12 // sys_sigaction
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SWI $0
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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·obsdsigprocmask(SB),NOSPLIT,$0
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MOVW how+0(FP), R0 // arg 1 - mode
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MOVW new+4(FP), R1 // arg 2 - new
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MOVW $48, R12 // sys_sigprocmask
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SWI $0
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MOVW.CS $3, R8 // crash on syscall failure
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MOVW.CS R8, (R8)
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MOVW R0, ret+8(FP)
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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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// If called from an external code context, g will not be set.
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// Save R0, since 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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// int32 tfork(void *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
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TEXT runtime·tfork(SB),NOSPLIT,$0
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// Copy mp, gp and fn off parent stack for use by child.
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MOVW mm+8(FP), R4
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MOVW gg+12(FP), R5
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MOVW fn+16(FP), R6
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MOVW param+0(FP), R0 // arg 1 - param
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MOVW psize+4(FP), R1 // arg 2 - psize
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MOVW $8, R12 // sys___tfork
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SWI $0
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// Return if syscall failed.
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B.CC 4(PC)
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RSB $0, R0
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MOVW R0, ret+20(FP)
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RET
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// In parent, return.
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CMP $0, R0
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BEQ 3(PC)
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MOVW R0, ret+20(FP)
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RET
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// Initialise m, g.
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MOVW R5, g
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MOVW R4, g_m(g)
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// Paranoia; check that stack splitting code works.
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BL runtime·emptyfunc(SB)
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// Call fn.
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BL (R6)
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// fn should never return.
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MOVW $2, R8 // crash if reached
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MOVW R8, (R8)
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RET
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TEXT runtime·sigaltstack(SB),NOSPLIT,$0
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MOVW new+0(FP), R0 // arg 1 - new sigaltstack
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MOVW old+4(FP), R1 // arg 2 - old sigaltstack
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MOVW $288, R12 // sys_sigaltstack
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SWI $0
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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·osyield(SB),NOSPLIT,$0
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MOVW $298, R12 // sys_sched_yield
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SWI $0
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RET
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TEXT runtime·thrsleep(SB),NOSPLIT,$4
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MOVW ident+0(FP), R0 // arg 1 - ident
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MOVW clock_id+4(FP), R1 // arg 2 - clock_id
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MOVW tsp+8(FP), R2 // arg 3 - tsp
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MOVW lock+12(FP), R3 // arg 4 - lock
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MOVW abort+16(FP), R4 // arg 5 - abort (on stack)
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MOVW R4, 4(R13)
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ADD $4, R13
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MOVW $94, R12 // sys___thrsleep
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SWI $0
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SUB $4, R13
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MOVW R0, ret+20(FP)
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RET
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TEXT runtime·thrwakeup(SB),NOSPLIT,$0
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MOVW ident+0(FP), R0 // arg 1 - ident
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MOVW n+4(FP), R1 // arg 2 - n
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MOVW $301, R12 // sys___thrwakeup
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SWI $0
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MOVW R0, ret+8(FP)
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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 - mib
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MOVW miblen+4(FP), R1 // arg 2 - miblen
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MOVW out+8(FP), R2 // arg 3 - out
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MOVW size+12(FP), R3 // arg 4 - size
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MOVW dst+16(FP), R4 // arg 5 - dest (on stack)
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MOVW R4, 4(R13)
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MOVW ndst+20(FP), R5 // arg 6 - newlen (on stack)
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MOVW R5, 8(R13)
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ADD $4, R13
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MOVW $202, R12 // sys___sysctl
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SWI $0
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SUB $4, R13
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MOVW.CC $0, R0
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RSB.CS $0, R0
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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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MOVW $269, R12 // sys_kqueue
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SWI $0
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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 // arg 1 - kq
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MOVW ch+4(FP), R1 // arg 2 - changelist
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MOVW nch+8(FP), R2 // arg 3 - nchanges
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MOVW ev+12(FP), R3 // arg 4 - eventlist
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MOVW nev+16(FP), R4 // arg 5 - nevents (on stack)
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MOVW R4, 4(R13)
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MOVW ts+20(FP), R5 // arg 6 - timeout (on stack)
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MOVW R5, 8(R13)
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ADD $4, R13
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MOVW $72, R12 // sys_kevent
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SWI $0
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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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// func closeonexec(fd int32)
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TEXT runtime·closeonexec(SB),NOSPLIT,$0
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MOVW fd+0(FP), R0 // arg 1 - fd
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MOVW $2, R1 // arg 2 - cmd (F_SETFD)
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MOVW $1, R2 // arg 3 - arg (FD_CLOEXEC)
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MOVW $92, R12 // sys_fcntl
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SWI $0
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RET
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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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MOVW $330, R12 // sys___get_tcb
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SWI $0
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MOVM.IAW (R13), [R1, R2, R3, R12]
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RET
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