src/runtime/sys_freebsd_arm.s - go - Git at Google

 // Copyright 2012 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.
 //
 // System calls and other sys.stuff for ARM, FreeBSD
 // /usr/src/sys/kern/syscalls.master for syscall numbers.
 //

 #include "go_asm.h"
 #include "go_tls.h"
 #include "textflag.h"

 // for EABI, as we don't support OABI
 #define SYS_BASE 0x0

 #define SYS_exit (SYS_BASE + 1)
 #define SYS_read (SYS_BASE + 3)
 #define SYS_write (SYS_BASE + 4)
 #define SYS_open (SYS_BASE + 5)
 #define SYS_close (SYS_BASE + 6)
 #define SYS_sigaltstack (SYS_BASE + 53)
 #define SYS_munmap (SYS_BASE + 73)
 #define SYS_madvise (SYS_BASE + 75)
 #define SYS_setitimer (SYS_BASE + 83)
 #define SYS_fcntl (SYS_BASE + 92)
 #define SYS_getrlimit (SYS_BASE + 194)
 #define SYS___sysctl (SYS_BASE + 202)
 #define SYS_nanosleep (SYS_BASE + 240)
 #define SYS_clock_gettime (SYS_BASE + 232)
 #define SYS_sched_yield (SYS_BASE + 331)
 #define SYS_sigprocmask (SYS_BASE + 340)
 #define SYS_kqueue (SYS_BASE + 362)
 #define SYS_kevent (SYS_BASE + 363)
 #define SYS_sigaction (SYS_BASE + 416)
 #define SYS_thr_exit (SYS_BASE + 431)
 #define SYS_thr_self (SYS_BASE + 432)
 #define SYS_thr_kill (SYS_BASE + 433)
 #define SYS__umtx_op (SYS_BASE + 454)
 #define SYS_thr_new (SYS_BASE + 455)
 #define SYS_mmap (SYS_BASE + 477)

 TEXT runtime·sys_umtx_op(SB),NOSPLIT,$0
 	MOVW 0(FP), R0
 	MOVW 4(FP), R1
 	MOVW 8(FP), R2
 	MOVW 12(FP), R3
 	ADD $20, R13 // arg 5 is passed on stack
 	MOVW $SYS__umtx_op, R7
 	SWI $0
 	SUB $20, R13
 	// BCS error
 	MOVW	R0, ret+20(FP)
 	RET

 TEXT runtime·thr_new(SB),NOSPLIT,$0
 	MOVW 0(FP), R0
 	MOVW 4(FP), R1
 	MOVW $SYS_thr_new, R7
 	SWI $0
 	RET

 TEXT runtime·thr_start(SB),NOSPLIT,$0
 	// set up g
 	MOVW m_g0(R0), g
 	MOVW R0, g_m(g)
 	BL runtime·emptyfunc(SB) // fault if stack check is wrong
 	BL runtime·mstart(SB)

 	MOVW $2, R8  // crash (not reached)
 	MOVW R8, (R8)
 	RET

 // Exit the entire program (like C exit)
 TEXT runtime·exit(SB),NOSPLIT,$-8
 	MOVW 0(FP), R0	// arg 1 exit status
 	MOVW $SYS_exit, R7
 	SWI $0
 	MOVW.CS $0, R8 // crash on syscall failure
 	MOVW.CS R8, (R8)
 	RET

 TEXT runtime·exit1(SB),NOSPLIT,$-8
 	MOVW 0(FP), R0	// arg 1 exit status
 	MOVW $SYS_thr_exit, R7
 	SWI $0
 	MOVW.CS $0, R8 // crash on syscall failure
 	MOVW.CS R8, (R8)
 	RET

 TEXT runtime·open(SB),NOSPLIT,$-8
 	MOVW 0(FP), R0	// arg 1 name
 	MOVW 4(FP), R1	// arg 2 mode
 	MOVW 8(FP), R2	// arg 3 perm
 	MOVW $SYS_open, R7
 	SWI $0
 	MOVW	R0, ret+12(FP)
 	RET

 TEXT runtime·read(SB),NOSPLIT,$-8
 	MOVW 0(FP), R0	// arg 1 fd
 	MOVW 4(FP), R1	// arg 2 buf
 	MOVW 8(FP), R2	// arg 3 count
 	MOVW $SYS_read, R7
 	SWI $0
 	MOVW	R0, ret+12(FP)
 	RET

 TEXT runtime·write(SB),NOSPLIT,$-8
 	MOVW 0(FP), R0	// arg 1 fd
 	MOVW 4(FP), R1	// arg 2 buf
 	MOVW 8(FP), R2	// arg 3 count
 	MOVW $SYS_write, R7
 	SWI $0
 	MOVW	R0, ret+12(FP)
 	RET

 TEXT runtime·close(SB),NOSPLIT,$-8
 	MOVW 0(FP), R0	// arg 1 fd
 	MOVW $SYS_close, R7
 	SWI $0
 	MOVW	R0, ret+4(FP)
 	RET

 TEXT runtime·getrlimit(SB),NOSPLIT,$-8
 	MOVW 0(FP), R0
 	MOVW 4(FP), R1
 	MOVW $SYS_getrlimit, R7
 	SWI $0
 	MOVW	R0, ret+8(FP)
 	RET

 TEXT runtime·raise(SB),NOSPLIT,$8
 	// thr_self(&4(R13))
 	MOVW $4(R13), R0 // arg 1 &4(R13)
 	MOVW $SYS_thr_self, R7
 	SWI $0
 	// thr_kill(self, SIGPIPE)
 	MOVW 4(R13), R0	// arg 1 id
 	MOVW sig+0(FP), R1	// arg 2 - signal
 	MOVW $SYS_thr_kill, R7
 	SWI $0
 	RET

 TEXT runtime·setitimer(SB), NOSPLIT, $-8
 	MOVW 0(FP), R0
 	MOVW 4(FP), R1
 	MOVW 8(FP), R2
 	MOVW $SYS_setitimer, R7
 	SWI $0
 	RET

 // func now() (sec int64, nsec int32)
 TEXT time·now(SB), NOSPLIT, $32
 	MOVW $0, R0 // CLOCK_REALTIME
 	MOVW $8(R13), R1
 	MOVW $SYS_clock_gettime, R7
 	SWI $0

 	MOVW 8(R13), R0 // sec.low
 	MOVW 12(R13), R1 // sec.high
 	MOVW 16(R13), R2 // nsec

 	MOVW R0, 0(FP)
 	MOVW R1, 4(FP)
 	MOVW R2, 8(FP)
 	RET

 // int64 nanotime(void) so really
 // void nanotime(int64 *nsec)
 TEXT runtime·nanotime(SB), NOSPLIT, $32
 	// We can use CLOCK_MONOTONIC_FAST here when we drop
 	// support for FreeBSD 8-STABLE.
 	MOVW $4, R0 // CLOCK_MONOTONIC
 	MOVW $8(R13), R1
 	MOVW $SYS_clock_gettime, R7
 	SWI $0

 	MOVW 8(R13), R0 // sec.low
 	MOVW 12(R13), R4 // sec.high
 	MOVW 16(R13), R2 // nsec

 	MOVW $1000000000, R3
 	MULLU R0, R3, (R1, R0)
 	MUL R3, R4
 	ADD.S R2, R0
 	ADC R4, R1

 	MOVW R0, ret_lo+0(FP)
 	MOVW R1, ret_hi+4(FP)
 	RET

 TEXT runtime·sigaction(SB),NOSPLIT,$-8
 	MOVW 0(FP), R0		// arg 1 sig
 	MOVW 4(FP), R1		// arg 2 act
 	MOVW 8(FP), R2		// arg 3 oact
 	MOVW $SYS_sigaction, R7
 	SWI $0
 	MOVW.CS $0, R8 // crash on syscall failure
 	MOVW.CS R8, (R8)
 	RET

 TEXT runtime·sigtramp(SB),NOSPLIT,$24
 	// this might be called in external code context,
 	// where g is not set.
 	// first save R0, because runtime·load_g will clobber it
 	MOVW	R0, 4(R13) // signum
 	MOVB	runtime·iscgo(SB), R0
 	CMP 	$0, R0
 	BL.NE	runtime·load_g(SB)

 	CMP $0, g
 	BNE 4(PC)
 	// signal number is already prepared in 4(R13)
 	MOVW $runtime·badsignal(SB), R11
 	BL (R11)
 	RET

 	// save g
 	MOVW g, R4
 	MOVW g, 20(R13)

 	// g = m->signal
 	MOVW g_m(g), R8
 	MOVW m_gsignal(R8), g

 	// R0 is already saved
 	MOVW R1, 8(R13) // info
 	MOVW R2, 12(R13) // context
 	MOVW R4, 16(R13) // oldg

 	BL runtime·sighandler(SB)

 	// restore g
 	MOVW 20(R13), g
 	RET

 TEXT runtime·mmap(SB),NOSPLIT,$16
 	MOVW 0(FP), R0		// arg 1 addr
 	MOVW 4(FP), R1		// arg 2 len
 	MOVW 8(FP), R2		// arg 3 prot
 	MOVW 12(FP), R3		// arg 4 flags
 	// arg 5 (fid) and arg6 (offset_lo, offset_hi) are passed on stack
 	// note the C runtime only passes the 32-bit offset_lo to us
 	MOVW 16(FP), R4		// arg 5
 	MOVW R4, 4(R13)
 	MOVW 20(FP), R5		// arg 6 lower 32-bit
 	// the word at 8(R13) is skipped due to 64-bit argument alignment.
 	MOVW R5, 12(R13)
 	MOVW $0, R6 		// higher 32-bit for arg 6
 	MOVW R6, 16(R13)
 	ADD $4, R13
 	MOVW $SYS_mmap, R7
 	SWI $0
 	SUB $4, R13
 	// TODO(dfc) error checking ?
 	MOVW	R0, ret+24(FP)
 	RET

 TEXT runtime·munmap(SB),NOSPLIT,$0
 	MOVW 0(FP), R0		// arg 1 addr
 	MOVW 4(FP), R1		// arg 2 len
 	MOVW $SYS_munmap, R7
 	SWI $0
 	MOVW.CS $0, R8 // crash on syscall failure
 	MOVW.CS R8, (R8)
 	RET

 TEXT runtime·madvise(SB),NOSPLIT,$0
 	MOVW 0(FP), R0		// arg 1 addr
 	MOVW 4(FP), R1		// arg 2 len
 	MOVW 8(FP), R2		// arg 3 flags
 	MOVW $SYS_madvise, R7
 	SWI $0
 	// ignore failure - maybe pages are locked
 	RET

 TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
 	MOVW new+0(FP), R0
 	MOVW old+4(FP), R1
 	MOVW $SYS_sigaltstack, R7
 	SWI $0
 	MOVW.CS $0, R8 // crash on syscall failure
 	MOVW.CS R8, (R8)
 	RET

 TEXT runtime·usleep(SB),NOSPLIT,$16
 	MOVW usec+0(FP), R0
 	MOVW R0, R2
 	MOVW $1000000, R1
 	DIV R1, R0
 	// 0(R13) is the saved LR, don't use it
 	MOVW R0, 4(R13) // tv_sec.low
 	MOVW $0, R0
 	MOVW R0, 8(R13) // tv_sec.high
 	MOD R1, R2
 	MOVW $1000, R1
 	MUL R1, R2
 	MOVW R2, 12(R13) // tv_nsec

 	MOVW $4(R13), R0 // arg 1 - rqtp
 	MOVW $0, R1      // arg 2 - rmtp
 	MOVW $SYS_nanosleep, R7
 	SWI $0
 	RET

 TEXT runtime·sysctl(SB),NOSPLIT,$0
 	MOVW 0(FP), R0	// arg 1 - name
 	MOVW 4(FP), R1	// arg 2 - namelen
 	MOVW 8(FP), R2	// arg 3 - old
 	MOVW 12(FP), R3	// arg 4 - oldlenp
 	// arg 5 (newp) and arg 6 (newlen) are passed on stack
 	ADD $20, R13
 	MOVW $SYS___sysctl, R7
 	SWI $0
 	SUB.CS $0, R0, R0
 	SUB $20, R13
 	MOVW	R0, ret+24(FP)
 	RET

 TEXT runtime·osyield(SB),NOSPLIT,$-4
 	MOVW $SYS_sched_yield, R7
 	SWI $0
 	RET

 TEXT runtime·sigprocmask(SB),NOSPLIT,$0
 	MOVW $3, R0	// arg 1 - how (SIG_SETMASK)
 	MOVW 0(FP), R1	// arg 2 - set
 	MOVW 4(FP), R2	// arg 3 - oset
 	MOVW $SYS_sigprocmask, R7
 	SWI $0
 	MOVW.CS $0, R8 // crash on syscall failure
 	MOVW.CS R8, (R8)
 	RET

 // int32 runtime·kqueue(void)
 TEXT runtime·kqueue(SB),NOSPLIT,$0
 	MOVW $SYS_kqueue, R7
 	SWI $0
 	RSB.CS $0, R0
 	MOVW	R0, ret+0(FP)
 	RET

 // int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout)
 TEXT runtime·kevent(SB),NOSPLIT,$0
 	MOVW 0(FP), R0	// kq
 	MOVW 4(FP), R1	// changelist
 	MOVW 8(FP), R2	// nchanges
 	MOVW 12(FP), R3	// eventlist
 	ADD $20, R13	// pass arg 5 and 6 on stack
 	MOVW $SYS_kevent, R7
 	SWI $0
 	RSB.CS $0, R0
 	SUB $20, R13
 	MOVW	R0, ret+24(FP)
 	RET

 // void runtime·closeonexec(int32 fd)
 TEXT runtime·closeonexec(SB),NOSPLIT,$0
 	MOVW 0(FP), R0	// fd
 	MOVW $2, R1	// F_SETFD
 	MOVW $1, R2	// FD_CLOEXEC
 	MOVW $SYS_fcntl, R7
 	SWI $0
 	RET

 TEXT runtime·casp1(SB),NOSPLIT,$0
 	B	runtime·cas(SB)

 // TODO(minux): this is only valid for ARMv6+
 // bool armcas(int32 *val, int32 old, int32 new)
 // Atomically:
 //	if(*val == old){
 //		*val = new;
 //		return 1;
 //	}else
 //		return 0;
 TEXT runtime·cas(SB),NOSPLIT,$0
 	B runtime·armcas(SB)

 // TODO(minux): this only supports ARMv6K+.
 TEXT runtime·read_tls_fallback(SB),NOSPLIT,$-4
 	WORD $0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3
 	RET
	// Copyright 2012 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.
	//
	// System calls and other sys.stuff for ARM, FreeBSD
	// /usr/src/sys/kern/syscalls.master for syscall numbers.
	//

	#include "go_asm.h"
	#include "go_tls.h"
	#include "textflag.h"

	// for EABI, as we don't support OABI
	#define SYS_BASE 0x0

	#define SYS_exit (SYS_BASE + 1)
	#define SYS_read (SYS_BASE + 3)
	#define SYS_write (SYS_BASE + 4)
	#define SYS_open (SYS_BASE + 5)
	#define SYS_close (SYS_BASE + 6)
	#define SYS_sigaltstack (SYS_BASE + 53)
	#define SYS_munmap (SYS_BASE + 73)
	#define SYS_madvise (SYS_BASE + 75)
	#define SYS_setitimer (SYS_BASE + 83)
	#define SYS_fcntl (SYS_BASE + 92)
	#define SYS_getrlimit (SYS_BASE + 194)
	#define SYS___sysctl (SYS_BASE + 202)
	#define SYS_nanosleep (SYS_BASE + 240)
	#define SYS_clock_gettime (SYS_BASE + 232)
	#define SYS_sched_yield (SYS_BASE + 331)
	#define SYS_sigprocmask (SYS_BASE + 340)
	#define SYS_kqueue (SYS_BASE + 362)
	#define SYS_kevent (SYS_BASE + 363)
	#define SYS_sigaction (SYS_BASE + 416)
	#define SYS_thr_exit (SYS_BASE + 431)
	#define SYS_thr_self (SYS_BASE + 432)
	#define SYS_thr_kill (SYS_BASE + 433)
	#define SYS__umtx_op (SYS_BASE + 454)
	#define SYS_thr_new (SYS_BASE + 455)
	#define SYS_mmap (SYS_BASE + 477)

	TEXT runtime·sys_umtx_op(SB),NOSPLIT,$0
	MOVW 0(FP), R0
	MOVW 4(FP), R1
	MOVW 8(FP), R2
	MOVW 12(FP), R3
	ADD $20, R13 // arg 5 is passed on stack
	MOVW $SYS__umtx_op, R7
	SWI $0
	SUB $20, R13
	// BCS error
	MOVW R0, ret+20(FP)
	RET

	TEXT runtime·thr_new(SB),NOSPLIT,$0
	MOVW 0(FP), R0
	MOVW 4(FP), R1
	MOVW $SYS_thr_new, R7
	SWI $0
	RET

	TEXT runtime·thr_start(SB),NOSPLIT,$0
	// set up g
	MOVW m_g0(R0), g
	MOVW R0, g_m(g)
	BL runtime·emptyfunc(SB) // fault if stack check is wrong
	BL runtime·mstart(SB)

	MOVW $2, R8 // crash (not reached)
	MOVW R8, (R8)
	RET

	// Exit the entire program (like C exit)
	TEXT runtime·exit(SB),NOSPLIT,$-8
	MOVW 0(FP), R0 // arg 1 exit status
	MOVW $SYS_exit, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

	TEXT runtime·exit1(SB),NOSPLIT,$-8
	MOVW 0(FP), R0 // arg 1 exit status
	MOVW $SYS_thr_exit, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

	TEXT runtime·open(SB),NOSPLIT,$-8
	MOVW 0(FP), R0 // arg 1 name
	MOVW 4(FP), R1 // arg 2 mode
	MOVW 8(FP), R2 // arg 3 perm
	MOVW $SYS_open, R7
	SWI $0
	MOVW R0, ret+12(FP)
	RET

	TEXT runtime·read(SB),NOSPLIT,$-8
	MOVW 0(FP), R0 // arg 1 fd
	MOVW 4(FP), R1 // arg 2 buf
	MOVW 8(FP), R2 // arg 3 count
	MOVW $SYS_read, R7
	SWI $0
	MOVW R0, ret+12(FP)
	RET

	TEXT runtime·write(SB),NOSPLIT,$-8
	MOVW 0(FP), R0 // arg 1 fd
	MOVW 4(FP), R1 // arg 2 buf
	MOVW 8(FP), R2 // arg 3 count
	MOVW $SYS_write, R7
	SWI $0
	MOVW R0, ret+12(FP)
	RET

	TEXT runtime·close(SB),NOSPLIT,$-8
	MOVW 0(FP), R0 // arg 1 fd
	MOVW $SYS_close, R7
	SWI $0
	MOVW R0, ret+4(FP)
	RET

	TEXT runtime·getrlimit(SB),NOSPLIT,$-8
	MOVW 0(FP), R0
	MOVW 4(FP), R1
	MOVW $SYS_getrlimit, R7
	SWI $0
	MOVW R0, ret+8(FP)
	RET

	TEXT runtime·raise(SB),NOSPLIT,$8
	// thr_self(&4(R13))
	MOVW $4(R13), R0 // arg 1 &4(R13)
	MOVW $SYS_thr_self, R7
	SWI $0
	// thr_kill(self, SIGPIPE)
	MOVW 4(R13), R0 // arg 1 id
	MOVW sig+0(FP), R1 // arg 2 - signal
	MOVW $SYS_thr_kill, R7
	SWI $0
	RET

	TEXT runtime·setitimer(SB), NOSPLIT, $-8
	MOVW 0(FP), R0
	MOVW 4(FP), R1
	MOVW 8(FP), R2
	MOVW $SYS_setitimer, R7
	SWI $0
	RET

	// func now() (sec int64, nsec int32)
	TEXT time·now(SB), NOSPLIT, $32
	MOVW $0, R0 // CLOCK_REALTIME
	MOVW $8(R13), R1
	MOVW $SYS_clock_gettime, R7
	SWI $0

	MOVW 8(R13), R0 // sec.low
	MOVW 12(R13), R1 // sec.high
	MOVW 16(R13), R2 // nsec

	MOVW R0, 0(FP)
	MOVW R1, 4(FP)
	MOVW R2, 8(FP)
	RET

	// int64 nanotime(void) so really
	// void nanotime(int64 *nsec)
	TEXT runtime·nanotime(SB), NOSPLIT, $32
	// We can use CLOCK_MONOTONIC_FAST here when we drop
	// support for FreeBSD 8-STABLE.
	MOVW $4, R0 // CLOCK_MONOTONIC
	MOVW $8(R13), R1
	MOVW $SYS_clock_gettime, R7
	SWI $0

	MOVW 8(R13), R0 // sec.low
	MOVW 12(R13), R4 // sec.high
	MOVW 16(R13), R2 // nsec

	MOVW $1000000000, R3
	MULLU R0, R3, (R1, R0)
	MUL R3, R4
	ADD.S R2, R0
	ADC R4, R1

	MOVW R0, ret_lo+0(FP)
	MOVW R1, ret_hi+4(FP)
	RET

	TEXT runtime·sigaction(SB),NOSPLIT,$-8
	MOVW 0(FP), R0 // arg 1 sig
	MOVW 4(FP), R1 // arg 2 act
	MOVW 8(FP), R2 // arg 3 oact
	MOVW $SYS_sigaction, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

	TEXT runtime·sigtramp(SB),NOSPLIT,$24
	// this might be called in external code context,
	// where g is not set.
	// first save R0, because runtime·load_g will clobber it
	MOVW R0, 4(R13) // signum
	MOVB runtime·iscgo(SB), R0
	CMP $0, R0
	BL.NE runtime·load_g(SB)

	CMP $0, g
	BNE 4(PC)
	// signal number is already prepared in 4(R13)
	MOVW $runtime·badsignal(SB), R11
	BL (R11)
	RET

	// save g
	MOVW g, R4
	MOVW g, 20(R13)

	// g = m->signal
	MOVW g_m(g), R8
	MOVW m_gsignal(R8), g

	// R0 is already saved
	MOVW R1, 8(R13) // info
	MOVW R2, 12(R13) // context
	MOVW R4, 16(R13) // oldg

	BL runtime·sighandler(SB)

	// restore g
	MOVW 20(R13), g
	RET

	TEXT runtime·mmap(SB),NOSPLIT,$16
	MOVW 0(FP), R0 // arg 1 addr
	MOVW 4(FP), R1 // arg 2 len
	MOVW 8(FP), R2 // arg 3 prot
	MOVW 12(FP), R3 // arg 4 flags
	// arg 5 (fid) and arg6 (offset_lo, offset_hi) are passed on stack
	// note the C runtime only passes the 32-bit offset_lo to us
	MOVW 16(FP), R4 // arg 5
	MOVW R4, 4(R13)
	MOVW 20(FP), R5 // arg 6 lower 32-bit
	// the word at 8(R13) is skipped due to 64-bit argument alignment.
	MOVW R5, 12(R13)
	MOVW $0, R6 // higher 32-bit for arg 6
	MOVW R6, 16(R13)
	ADD $4, R13
	MOVW $SYS_mmap, R7
	SWI $0
	SUB $4, R13
	// TODO(dfc) error checking ?
	MOVW R0, ret+24(FP)
	RET

	TEXT runtime·munmap(SB),NOSPLIT,$0
	MOVW 0(FP), R0 // arg 1 addr
	MOVW 4(FP), R1 // arg 2 len
	MOVW $SYS_munmap, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

	TEXT runtime·madvise(SB),NOSPLIT,$0
	MOVW 0(FP), R0 // arg 1 addr
	MOVW 4(FP), R1 // arg 2 len
	MOVW 8(FP), R2 // arg 3 flags
	MOVW $SYS_madvise, R7
	SWI $0
	// ignore failure - maybe pages are locked
	RET

	TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
	MOVW new+0(FP), R0
	MOVW old+4(FP), R1
	MOVW $SYS_sigaltstack, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

	TEXT runtime·usleep(SB),NOSPLIT,$16
	MOVW usec+0(FP), R0
	MOVW R0, R2
	MOVW $1000000, R1
	DIV R1, R0
	// 0(R13) is the saved LR, don't use it
	MOVW R0, 4(R13) // tv_sec.low
	MOVW $0, R0
	MOVW R0, 8(R13) // tv_sec.high
	MOD R1, R2
	MOVW $1000, R1
	MUL R1, R2
	MOVW R2, 12(R13) // tv_nsec

	MOVW $4(R13), R0 // arg 1 - rqtp
	MOVW $0, R1 // arg 2 - rmtp
	MOVW $SYS_nanosleep, R7
	SWI $0
	RET

	TEXT runtime·sysctl(SB),NOSPLIT,$0
	MOVW 0(FP), R0 // arg 1 - name
	MOVW 4(FP), R1 // arg 2 - namelen
	MOVW 8(FP), R2 // arg 3 - old
	MOVW 12(FP), R3 // arg 4 - oldlenp
	// arg 5 (newp) and arg 6 (newlen) are passed on stack
	ADD $20, R13
	MOVW $SYS___sysctl, R7
	SWI $0
	SUB.CS $0, R0, R0
	SUB $20, R13
	MOVW R0, ret+24(FP)
	RET

	TEXT runtime·osyield(SB),NOSPLIT,$-4
	MOVW $SYS_sched_yield, R7
	SWI $0
	RET

	TEXT runtime·sigprocmask(SB),NOSPLIT,$0
	MOVW $3, R0 // arg 1 - how (SIG_SETMASK)
	MOVW 0(FP), R1 // arg 2 - set
	MOVW 4(FP), R2 // arg 3 - oset
	MOVW $SYS_sigprocmask, R7
	SWI $0
	MOVW.CS $0, R8 // crash on syscall failure
	MOVW.CS R8, (R8)
	RET

	// int32 runtime·kqueue(void)
	TEXT runtime·kqueue(SB),NOSPLIT,$0
	MOVW $SYS_kqueue, R7
	SWI $0
	RSB.CS $0, R0
	MOVW R0, ret+0(FP)
	RET

	// int32 runtime·kevent(int kq, Kevent changelist, int nchanges, Kevent eventlist, int nevents, Timespec *timeout)
	TEXT runtime·kevent(SB),NOSPLIT,$0
	MOVW 0(FP), R0 // kq
	MOVW 4(FP), R1 // changelist
	MOVW 8(FP), R2 // nchanges
	MOVW 12(FP), R3 // eventlist
	ADD $20, R13 // pass arg 5 and 6 on stack
	MOVW $SYS_kevent, R7
	SWI $0
	RSB.CS $0, R0
	SUB $20, R13
	MOVW R0, ret+24(FP)
	RET

	// void runtime·closeonexec(int32 fd)
	TEXT runtime·closeonexec(SB),NOSPLIT,$0
	MOVW 0(FP), R0 // fd
	MOVW $2, R1 // F_SETFD
	MOVW $1, R2 // FD_CLOEXEC
	MOVW $SYS_fcntl, R7
	SWI $0
	RET

	TEXT runtime·casp1(SB),NOSPLIT,$0
	B runtime·cas(SB)

	// TODO(minux): this is only valid for ARMv6+
	// bool armcas(int32 *val, int32 old, int32 new)
	// Atomically:
	// if(*val == old){
	// *val = new;
	// return 1;
	// }else
	// return 0;
	TEXT runtime·cas(SB),NOSPLIT,$0
	B runtime·armcas(SB)

	// TODO(minux): this only supports ARMv6K+.
	TEXT runtime·read_tls_fallback(SB),NOSPLIT,$-4
	WORD $0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3
	RET