// 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_getpid (SYS_BASE + 20)
#define SYS_kill (SYS_BASE + 37)
#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___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)
#define SYS_cpuset_getaffinity (SYS_BASE + 487)
TEXT runtime·sys_umtx_op(SB),NOSPLIT,$0
MOVW addr+0(FP), R0
MOVW mode+4(FP), R1
MOVW val+8(FP), R2
MOVW uaddr1+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 param+0(FP), R0
MOVW size+4(FP), R1
MOVW $SYS_thr_new, R7
SWI $0
MOVW R0, ret+8(FP)
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|NOFRAME,$0
MOVW code+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
// func exitThread(wait *uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0-4
MOVW wait+0(FP), R0
// We're done using the stack.
MOVW $0, R2
storeloop:
LDREX (R0), R4 // loads R4
STREX R2, (R0), R1 // stores R2
CMP $0, R1
BNE storeloop
MOVW $0, R0 // arg 1 long *state
MOVW $SYS_thr_exit, R7
SWI $0
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
JMP 0(PC)
TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0
MOVW name+0(FP), R0 // arg 1 name
MOVW mode+4(FP), R1 // arg 2 mode
MOVW perm+8(FP), R2 // arg 3 perm
MOVW $SYS_open, R7
SWI $0
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0 // arg 1 fd
MOVW p+4(FP), R1 // arg 2 buf
MOVW n+8(FP), R2 // arg 3 count
MOVW $SYS_read, R7
SWI $0
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·write(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0 // arg 1 fd
MOVW p+4(FP), R1 // arg 2 buf
MOVW n+8(FP), R2 // arg 3 count
MOVW $SYS_write, R7
SWI $0
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0 // arg 1 fd
MOVW $SYS_close, R7
SWI $0
MOVW.CS $-1, R0
MOVW R0, ret+4(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·raiseproc(SB),NOSPLIT,$0
// getpid
MOVW $SYS_getpid, R7
SWI $0
// kill(self, sig)
// arg 1 - pid, now in R0
MOVW sig+0(FP), R1 // arg 2 - signal
MOVW $SYS_kill, R7
SWI $0
RET
TEXT runtime·setitimer(SB), NOSPLIT|NOFRAME, $0
MOVW mode+0(FP), R0
MOVW new+4(FP), R1
MOVW old+8(FP), R2
MOVW $SYS_setitimer, R7
SWI $0
RET
// func fallback_walltime() (sec int64, nsec int32)
TEXT runtime·fallback_walltime(SB), NOSPLIT, $32-12
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, sec_lo+0(FP)
MOVW R1, sec_hi+4(FP)
MOVW R2, nsec+8(FP)
RET
// func fallback_nanotime() int64
TEXT runtime·fallback_nanotime(SB), NOSPLIT, $32
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·asmSigaction(SB),NOSPLIT|NOFRAME,$0
MOVW sig+0(FP), R0 // arg 1 sig
MOVW new+4(FP), R1 // arg 2 act
MOVW old+8(FP), R2 // arg 3 oact
MOVW $SYS_sigaction, R7
SWI $0
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$12
// 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)
MOVW R1, 8(R13)
MOVW R2, 12(R13)
BL runtime·sigtrampgo(SB)
RET
TEXT runtime·mmap(SB),NOSPLIT,$16
MOVW addr+0(FP), R0 // arg 1 addr
MOVW n+4(FP), R1 // arg 2 len
MOVW prot+8(FP), R2 // arg 3 prot
MOVW flags+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 fd+16(FP), R4 // arg 5
MOVW R4, 4(R13)
MOVW off+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
MOVW $0, R1
MOVW.CS R0, R1 // if failed, put in R1
MOVW.CS $0, R0
MOVW R0, p+24(FP)
MOVW R1, err+28(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT,$0
MOVW addr+0(FP), R0 // arg 1 addr
MOVW n+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 addr+0(FP), R0 // arg 1 addr
MOVW n+4(FP), R1 // arg 2 len
MOVW flags+8(FP), R2 // arg 3 flags
MOVW $SYS_madvise, R7
SWI $0
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
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·sigfwd(SB),NOSPLIT,$0-16
MOVW sig+4(FP), R0
MOVW info+8(FP), R1
MOVW ctx+12(FP), R2
MOVW fn+0(FP), R11
MOVW R13, R4
SUB $24, R13
BIC $0x7, R13 // alignment for ELF ABI
BL (R11)
MOVW R4, R13
RET
TEXT runtime·usleep(SB),NOSPLIT,$16
MOVW usec+0(FP), R0
CALL runtime·usplitR0(SB)
// 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
MOVW $1000, R2
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 mib+0(FP), R0 // arg 1 - name
MOVW miblen+4(FP), R1 // arg 2 - namelen
MOVW out+8(FP), R2 // arg 3 - old
MOVW size+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|NOFRAME,$0
MOVW $SYS_sched_yield, R7
SWI $0
RET
TEXT runtime·sigprocmask(SB),NOSPLIT,$0
MOVW how+0(FP), R0 // arg 1 - how
MOVW new+4(FP), R1 // arg 2 - set
MOVW old+8(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 kq+0(FP), R0 // kq
MOVW ch+4(FP), R1 // changelist
MOVW nch+8(FP), R2 // nchanges
MOVW ev+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 fd+0(FP), R0 // fd
MOVW $2, R1 // F_SETFD
MOVW $1, R2 // FD_CLOEXEC
MOVW $SYS_fcntl, R7
SWI $0
RET
// TODO: this is only valid for ARMv7+
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
B runtime·armPublicationBarrier(SB)
// TODO(minux): this only supports ARMv6K+.
TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
WORD $0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3
RET
// func cpuset_getaffinity(level int, which int, id int64, size int, mask *byte) int32
TEXT runtime·cpuset_getaffinity(SB), NOSPLIT, $0-28
MOVW level+0(FP), R0
MOVW which+4(FP), R1
MOVW id_lo+8(FP), R2
MOVW id_hi+12(FP), R3
ADD $20, R13 // Pass size and mask on stack.
MOVW $SYS_cpuset_getaffinity, R7
SWI $0
RSB.CS $0, R0
SUB $20, R13
MOVW R0, ret+24(FP)
RET
// func getCntxct(physical bool) uint32
TEXT runtime·getCntxct(SB),NOSPLIT|NOFRAME,$0-8
MOVB runtime·goarm(SB), R11
CMP $7, R11
BLT 2(PC)
DMB
MOVB physical+0(FP), R0
CMP $1, R0
B.NE 3(PC)
// get CNTPCT (Physical Count Register) into R0(low) R1(high)
// mrrc 15, 0, r0, r1, cr14
WORD $0xec510f0e
B 2(PC)
// get CNTVCT (Virtual Count Register) into R0(low) R1(high)
// mrrc 15, 1, r0, r1, cr14
WORD $0xec510f1e
MOVW R0, ret+4(FP)
RET
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