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go/src/runtime/sys_freebsd_arm.s
Michael Matloob 67faca7d9c runtime: break atomics out into package runtime/internal/atomic 
This change breaks out most of the atomics functions in the runtime
into package runtime/internal/atomic. It adds some basic support
in the toolchain for runtime packages, and also modifies linux/arm
atomics to remove the dependency on the runtime's mutex. The mutexes
have been replaced with spinlocks.

all trybots are happy!
In addition to the trybots, I've tested on the darwin/arm64 builder,
on the darwin/arm builder, and on a ppc64le machine.

Change-Id: I6698c8e3cf3834f55ce5824059f44d00dc8e3c2f
Reviewed-on: https://go-review.googlesource.com/14204
Run-TryBot: Michael Matloob <matloob@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2015-11-10 17:38:04 +00:00

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// 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_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 addr+0(FP), R0
MOVW mode+4(FP), R1
MOVW val+8(FP), R2
MOVW ptr2+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
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 code+0(FP), R0 // arg 1 exit status
MOVW $SYS_exit, R7
SWI $0
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·exit1(SB),NOSPLIT,$-8
MOVW code+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 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 $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·read(SB),NOSPLIT,$-8
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 $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·write(SB),NOSPLIT,$-8
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 $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT,$-8
MOVW fd+0(FP), R0 // arg 1 fd
MOVW $SYS_close, R7
SWI $0
MOVW.CS $-1, R0
MOVW R0, ret+4(FP)
RET
TEXT runtime·getrlimit(SB),NOSPLIT,$-8
MOVW kind+0(FP), R0
MOVW limit+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·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, $-8
MOVW mode+0(FP), R0
MOVW new+4(FP), R1
MOVW old+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, sec_lo+0(FP)
MOVW R1, sec_hi+4(FP)
MOVW R2, nsec+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 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 $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 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
// TODO(dfc) error checking ?
MOVW R0, ret+24(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 $0
// ignore failure - maybe pages are locked
RET
TEXT runtime·sigaltstack(SB),NOSPLIT,$-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
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 $20, R13
MOVW R0, ret+24(FP)
RET
TEXT runtime·osyield(SB),NOSPLIT,$-4
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 $0
RET
// TODO: this is only valid for ARMv7+
TEXT ·publicationBarrier(SB),NOSPLIT,$-4-0
B runtime·armPublicationBarrier(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
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