1// Copyright 2013 The Go Authors. All rights reserved.2// Use of this source code is governed by a BSD-style3// license that can be found in the LICENSE file.4//5// System calls and other sys.stuff for ARM, NetBSD6// /usr/src/sys/kern/syscalls.master for syscall numbers.7//89#include "go_asm.h"10#include "go_tls.h"11#include "textflag.h"1213#define CLOCK_REALTIME		014#define CLOCK_MONOTONIC		31516#define SWI_OS_NETBSD			0xa0000017#define SYS_exit			SWI_OS_NETBSD | 118#define SYS_read			SWI_OS_NETBSD | 319#define SYS_write			SWI_OS_NETBSD | 420#define SYS_open			SWI_OS_NETBSD | 521#define SYS_close			SWI_OS_NETBSD | 622#define SYS_getpid			SWI_OS_NETBSD | 2023#define SYS_kill			SWI_OS_NETBSD | 3724#define SYS_munmap			SWI_OS_NETBSD | 7325#define SYS_madvise			SWI_OS_NETBSD | 7526#define SYS_fcntl			SWI_OS_NETBSD | 9227#define SYS_mmap			SWI_OS_NETBSD | 19728#define SYS___sysctl			SWI_OS_NETBSD | 20229#define SYS___sigaltstack14		SWI_OS_NETBSD | 28130#define SYS___sigprocmask14		SWI_OS_NETBSD | 29331#define SYS_issetugid			SWI_OS_NETBSD | 30532#define SYS_getcontext			SWI_OS_NETBSD | 30733#define SYS_setcontext			SWI_OS_NETBSD | 30834#define SYS__lwp_create			SWI_OS_NETBSD | 30935#define SYS__lwp_exit			SWI_OS_NETBSD | 31036#define SYS__lwp_self			SWI_OS_NETBSD | 31137#define SYS__lwp_getprivate		SWI_OS_NETBSD | 31638#define SYS__lwp_setprivate		SWI_OS_NETBSD | 31739#define SYS__lwp_kill			SWI_OS_NETBSD | 31840#define SYS__lwp_unpark			SWI_OS_NETBSD | 32141#define SYS___sigaction_sigtramp	SWI_OS_NETBSD | 34042#define SYS_kqueue			SWI_OS_NETBSD | 34443#define SYS_sched_yield			SWI_OS_NETBSD | 35044#define SYS___setitimer50		SWI_OS_NETBSD | 42545#define SYS___clock_gettime50		SWI_OS_NETBSD | 42746#define SYS___nanosleep50		SWI_OS_NETBSD | 43047#define SYS___kevent50			SWI_OS_NETBSD | 43548#define SYS____lwp_park60		SWI_OS_NETBSD | 4784950// Exit the entire program (like C exit)51TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$052	MOVW code+0(FP), R0	// arg 1 exit status53	SWI $SYS_exit54	MOVW.CS $0, R8	// crash on syscall failure55	MOVW.CS R8, (R8)56	RET5758// func exitThread(wait *atomic.Uint32)59TEXT runtime·exitThread(SB),NOSPLIT,$0-460	MOVW wait+0(FP), R061	// We're done using the stack.62	MOVW $0, R263storeloop:64	LDREX (R0), R4          // loads R465	STREX R2, (R0), R1      // stores R266	CMP $0, R167	BNE storeloop68	SWI $SYS__lwp_exit69	MOVW $1, R8	// crash70	MOVW R8, (R8)71	JMP 0(PC)7273TEXT runtime·open(SB),NOSPLIT|NOFRAME,$074	MOVW name+0(FP), R075	MOVW mode+4(FP), R176	MOVW perm+8(FP), R277	SWI $SYS_open78	MOVW.CS	$-1, R079	MOVW	R0, ret+12(FP)80	RET8182TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$083	MOVW fd+0(FP), R084	SWI $SYS_close85	MOVW.CS	$-1, R086	MOVW	R0, ret+4(FP)87	RET8889TEXT runtime·read(SB),NOSPLIT|NOFRAME,$090	MOVW fd+0(FP), R091	MOVW p+4(FP), R192	MOVW n+8(FP), R293	SWI $SYS_read94	RSB.CS	$0, R0		// caller expects negative errno95	MOVW	R0, ret+12(FP)96	RET9798// func pipe2(flags int32) (r, w int32, errno int32)99TEXT runtime·pipe2(SB),NOSPLIT,$0-16100	MOVW $r+4(FP), R0101	MOVW flags+0(FP), R1102	SWI $0xa001c5103	MOVW R0, errno+12(FP)104	RET105106TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0107	MOVW	fd+0(FP), R0	// arg 1 - fd108	MOVW	p+4(FP), R1	// arg 2 - buf109	MOVW	n+8(FP), R2	// arg 3 - nbyte110	SWI $SYS_write111	RSB.CS	$0, R0		// caller expects negative errno112	MOVW	R0, ret+12(FP)113	RET114115// int32 lwp_create(void *context, uintptr flags, void *lwpid)116TEXT runtime·lwp_create(SB),NOSPLIT,$0117	MOVW ctxt+0(FP), R0118	MOVW flags+4(FP), R1119	MOVW lwpid+8(FP), R2120	SWI $SYS__lwp_create121	MOVW	R0, ret+12(FP)122	RET123124TEXT runtime·osyield(SB),NOSPLIT,$0125	SWI $SYS_sched_yield126	RET127128TEXT runtime·lwp_park(SB),NOSPLIT,$8129	MOVW clockid+0(FP), R0		// arg 1 - clock_id130	MOVW flags+4(FP), R1		// arg 2 - flags131	MOVW ts+8(FP), R2		// arg 3 - ts132	MOVW unpark+12(FP), R3		// arg 4 - unpark133	MOVW hint+16(FP), R4		// arg 5 - hint134	MOVW R4, 4(R13)135	MOVW unparkhint+20(FP), R5	// arg 6 - unparkhint136	MOVW R5, 8(R13)137	SWI $SYS____lwp_park60138	MOVW	R0, ret+24(FP)139	RET140141TEXT runtime·lwp_unpark(SB),NOSPLIT,$0142	MOVW	lwp+0(FP), R0	// arg 1 - lwp143	MOVW	hint+4(FP), R1	// arg 2 - hint144	SWI	$SYS__lwp_unpark145	MOVW	R0, ret+8(FP)146	RET147148TEXT runtime·lwp_self(SB),NOSPLIT,$0149	SWI	$SYS__lwp_self150	MOVW	R0, ret+0(FP)151	RET152153TEXT runtime·lwp_tramp(SB),NOSPLIT,$0154	MOVW R0, g_m(R1)155	MOVW R1, g156157	BL runtime·emptyfunc(SB) // fault if stack check is wrong158	BL (R2)159	MOVW $2, R8  // crash (not reached)160	MOVW R8, (R8)161	RET162163TEXT ·netbsdMstart(SB),NOSPLIT|TOPFRAME,$0164	BL ·netbsdMstart0(SB)165	RET // not reached166167TEXT runtime·usleep(SB),NOSPLIT,$16168	MOVW usec+0(FP), R0169	CALL runtime·usplitR0(SB)170	// 0(R13) is the saved LR, don't use it171	MOVW R0, 4(R13) // tv_sec.low172	MOVW $0, R0173	MOVW R0, 8(R13) // tv_sec.high174	MOVW $1000, R2175	MUL R1, R2176	MOVW R2, 12(R13) // tv_nsec177178	MOVW $4(R13), R0 // arg 1 - rqtp179	MOVW $0, R1      // arg 2 - rmtp180	SWI $SYS___nanosleep50181	RET182183TEXT runtime·lwp_kill(SB),NOSPLIT,$0-8184	MOVW	tid+0(FP), R0	// arg 1 - tid185	MOVW	sig+4(FP), R1	// arg 2 - signal186	SWI	$SYS__lwp_kill187	RET188189TEXT runtime·raiseproc(SB),NOSPLIT,$16190	SWI	$SYS_getpid	// the returned R0 is arg 1191	MOVW	sig+0(FP), R1	// arg 2 - signal192	SWI	$SYS_kill193	RET194195TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0196	MOVW mode+0(FP), R0	// arg 1 - which197	MOVW new+4(FP), R1	// arg 2 - itv198	MOVW old+8(FP), R2	// arg 3 - oitv199	SWI $SYS___setitimer50200	RET201202// func walltime() (sec int64, nsec int32)203TEXT runtime·walltime(SB), NOSPLIT, $32204	MOVW $0, R0	// CLOCK_REALTIME205	MOVW $8(R13), R1206	SWI $SYS___clock_gettime50207208	MOVW 8(R13), R0	// sec.low209	MOVW 12(R13), R1 // sec.high210	MOVW 16(R13), R2 // nsec211212	MOVW R0, sec_lo+0(FP)213	MOVW R1, sec_hi+4(FP)214	MOVW R2, nsec+8(FP)215	RET216217// int64 nanotime1(void) so really218// void nanotime1(int64 *nsec)219TEXT runtime·nanotime1(SB), NOSPLIT, $32220	MOVW $3, R0 // CLOCK_MONOTONIC221	MOVW $8(R13), R1222	SWI $SYS___clock_gettime50223224	MOVW 8(R13), R0 // sec.low225	MOVW 12(R13), R4 // sec.high226	MOVW 16(R13), R2 // nsec227228	MOVW $1000000000, R3229	MULLU R0, R3, (R1, R0)230	MUL R3, R4231	ADD.S R2, R0232	ADC R4, R1233234	MOVW R0, ret_lo+0(FP)235	MOVW R1, ret_hi+4(FP)236	RET237238TEXT runtime·getcontext(SB),NOSPLIT|NOFRAME,$0239	MOVW ctxt+0(FP), R0	// arg 1 - context240	SWI $SYS_getcontext241	MOVW.CS $0, R8	// crash on syscall failure242	MOVW.CS R8, (R8)243	RET244245TEXT runtime·sigprocmask(SB),NOSPLIT,$0246	MOVW how+0(FP), R0	// arg 1 - how247	MOVW new+4(FP), R1	// arg 2 - set248	MOVW old+8(FP), R2	// arg 3 - oset249	SWI $SYS___sigprocmask14250	MOVW.CS $0, R8	// crash on syscall failure251	MOVW.CS R8, (R8)252	RET253254TEXT sigreturn_tramp<>(SB),NOSPLIT|NOFRAME,$0255	// on entry, SP points to siginfo, we add sizeof(ucontext)256	// to SP to get a pointer to ucontext.257	ADD $0x80, R13, R0 // 0x80 == sizeof(UcontextT)258	SWI $SYS_setcontext259	// something failed, we have to exit260	MOVW $0x4242, R0 // magic return number261	SWI $SYS_exit262	B -2(PC)	// continue exit263264TEXT runtime·sigaction(SB),NOSPLIT,$4265	MOVW sig+0(FP), R0	// arg 1 - signum266	MOVW new+4(FP), R1	// arg 2 - nsa267	MOVW old+8(FP), R2	// arg 3 - osa268	MOVW $sigreturn_tramp<>(SB), R3	// arg 4 - tramp269	MOVW $2, R4	// arg 5 - vers270	MOVW R4, 4(R13)271	ADD $4, R13	// pass arg 5 on stack272	SWI $SYS___sigaction_sigtramp273	SUB $4, R13274	MOVW.CS $3, R8	// crash on syscall failure275	MOVW.CS R8, (R8)276	RET277278TEXT runtime·sigfwd(SB),NOSPLIT,$0-16279	MOVW	sig+4(FP), R0280	MOVW	info+8(FP), R1281	MOVW	ctx+12(FP), R2282	MOVW	fn+0(FP), R11283	MOVW	R13, R4284	SUB	$24, R13285	BIC	$0x7, R13 // alignment for ELF ABI286	BL	(R11)287	MOVW	R4, R13288	RET289290TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$0291	// Reserve space for callee-save registers and arguments.292	MOVM.DB.W [R4-R11], (R13)293	SUB	$16, R13294295	// this might be called in external code context,296	// where g is not set.297	// first save R0, because runtime·load_g will clobber it298	MOVW	R0, 4(R13) // signum299	MOVB	runtime·iscgo(SB), R0300	CMP 	$0, R0301	BL.NE	runtime·load_g(SB)302303	MOVW	R1, 8(R13)304	MOVW	R2, 12(R13)305	BL	runtime·sigtrampgo(SB)306307	// Restore callee-save registers.308	ADD	$16, R13309	MOVM.IA.W (R13), [R4-R11]310311	RET312313TEXT runtime·mmap(SB),NOSPLIT,$12314	MOVW addr+0(FP), R0	// arg 1 - addr315	MOVW n+4(FP), R1	// arg 2 - len316	MOVW prot+8(FP), R2	// arg 3 - prot317	MOVW flags+12(FP), R3	// arg 4 - flags318	// arg 5 (fid) and arg6 (offset_lo, offset_hi) are passed on stack319	// note the C runtime only passes the 32-bit offset_lo to us320	MOVW fd+16(FP), R4		// arg 5321	MOVW R4, 4(R13)322	MOVW off+20(FP), R5		// arg 6 lower 32-bit323	MOVW R5, 8(R13)324	MOVW $0, R6 // higher 32-bit for arg 6325	MOVW R6, 12(R13)326	ADD $4, R13 // pass arg 5 and arg 6 on stack327	SWI $SYS_mmap328	SUB $4, R13329	MOVW	$0, R1330	MOVW.CS R0, R1	// if error, move to R1331	MOVW.CS $0, R0332	MOVW	R0, p+24(FP)333	MOVW	R1, err+28(FP)334	RET335336TEXT runtime·munmap(SB),NOSPLIT,$0337	MOVW addr+0(FP), R0	// arg 1 - addr338	MOVW n+4(FP), R1	// arg 2 - len339	SWI $SYS_munmap340	MOVW.CS $0, R8	// crash on syscall failure341	MOVW.CS R8, (R8)342	RET343344TEXT runtime·madvise(SB),NOSPLIT,$0345	MOVW	addr+0(FP), R0	// arg 1 - addr346	MOVW	n+4(FP), R1	// arg 2 - len347	MOVW	flags+8(FP), R2	// arg 3 - behav348	SWI	$SYS_madvise349	MOVW.CS	$-1, R0350	MOVW	R0, ret+12(FP)351	RET352353TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0354	MOVW new+0(FP), R0	// arg 1 - nss355	MOVW old+4(FP), R1	// arg 2 - oss356	SWI $SYS___sigaltstack14357	MOVW.CS $0, R8	// crash on syscall failure358	MOVW.CS R8, (R8)359	RET360361TEXT runtime·sysctl(SB),NOSPLIT,$8362	MOVW mib+0(FP), R0	// arg 1 - name363	MOVW miblen+4(FP), R1	// arg 2 - namelen364	MOVW out+8(FP), R2	// arg 3 - oldp365	MOVW size+12(FP), R3	// arg 4 - oldlenp366	MOVW dst+16(FP), R4	// arg 5 - newp367	MOVW R4, 4(R13)368	MOVW ndst+20(FP), R4	// arg 6 - newlen369	MOVW R4, 8(R13)370	ADD $4, R13	// pass arg 5 and 6 on stack371	SWI $SYS___sysctl372	SUB $4, R13373	MOVW	R0, ret+24(FP)374	RET375376// int32 runtime·kqueue(void)377TEXT runtime·kqueue(SB),NOSPLIT,$0378	SWI	$SYS_kqueue379	RSB.CS	$0, R0380	MOVW	R0, ret+0(FP)381	RET382383// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout)384TEXT runtime·kevent(SB),NOSPLIT,$8385	MOVW kq+0(FP), R0	// kq386	MOVW ch+4(FP), R1	// changelist387	MOVW nch+8(FP), R2	// nchanges388	MOVW ev+12(FP), R3	// eventlist389	MOVW nev+16(FP), R4	// nevents390	MOVW R4, 4(R13)391	MOVW ts+20(FP), R4	// timeout392	MOVW R4, 8(R13)393	ADD $4, R13	// pass arg 5 and 6 on stack394	SWI $SYS___kevent50395	RSB.CS $0, R0396	SUB $4, R13397	MOVW	R0, ret+24(FP)398	RET399400// func fcntl(fd, cmd, args int32) int32401TEXT runtime·fcntl(SB),NOSPLIT,$0402	MOVW fd+0(FP), R0403	MOVW cmd+4(FP), R1404	MOVW arg+8(FP), R2405	SWI $SYS_fcntl406	MOVW $0, R1407	MOVW.CS R0, R1408	MOVW.CS $-1, R0409	MOVW R0, ret+12(FP)410	MOVW R1, errno+16(FP)411	RET412413// TODO: this is only valid for ARMv7+414TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0415	B	runtime·armPublicationBarrier(SB)416417TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0418	MOVM.WP [R1, R2, R3, R12], (R13)419	SWI $SYS__lwp_getprivate420	MOVM.IAW    (R13), [R1, R2, R3, R12]421	RET422423// func issetugid() int32424TEXT runtime·issetugid(SB),NOSPLIT,$0425	SWI $SYS_issetugid426	MOVW	R0, ret+0(FP)427	RET