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go/src/runtime/sys_darwin_arm.s
Josh Bleecher Snyder b6e0d4647f runtime: update assembly var names after monotonic time changes 
Change-Id: I721045120a4df41462c02252e2e5e8529ae2d694
Reviewed-on: https://go-review.googlesource.com/37303
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2017-02-21 18:42:05 +00:00

506 lines
12 KiB
ArmAsm
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// Copyright 2014 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, Darwin
// See http://fxr.watson.org/fxr/source/bsd/kern/syscalls.c?v=xnu-1228
// or /usr/include/sys/syscall.h (on a Mac) for system call numbers.
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
// Copied from /usr/include/sys/syscall.h
#define SYS_exit 1
#define SYS_read 3
#define SYS_write 4
#define SYS_open 5
#define SYS_close 6
#define SYS_mmap 197
#define SYS_munmap 73
#define SYS_madvise 75
#define SYS_mincore 78
#define SYS_gettimeofday 116
#define SYS_kill 37
#define SYS_getpid 20
#define SYS___pthread_kill 328
#define SYS_pthread_sigmask 329
#define SYS_setitimer 83
#define SYS___sysctl 202
#define SYS_sigaction 46
#define SYS_sigreturn 184
#define SYS_select 93
#define SYS_bsdthread_register 366
#define SYS_bsdthread_create 360
#define SYS_bsdthread_terminate 361
#define SYS_kqueue 362
#define SYS_kevent 363
#define SYS_fcntl 92
TEXT notok<>(SB),NOSPLIT,$0
MOVW $0, R8
MOVW R8, (R8)
B 0(PC)
TEXT runtime·open(SB),NOSPLIT,$0
MOVW name+0(FP), R0
MOVW mode+4(FP), R1
MOVW perm+8(FP), R2
MOVW $SYS_open, R12
SWI $0x80
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW $SYS_close, R12
SWI $0x80
MOVW.CS $-1, R0
MOVW R0, ret+4(FP)
RET
TEXT runtime·write(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW p+4(FP), R1
MOVW n+8(FP), R2
MOVW $SYS_write, R12
SWI $0x80
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·read(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW p+4(FP), R1
MOVW n+8(FP), R2
MOVW $SYS_read, R12
SWI $0x80
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·exit(SB),NOSPLIT,$-4
MOVW code+0(FP), R0
MOVW $SYS_exit, R12
SWI $0x80
MOVW $1234, R0
MOVW $1002, R1
MOVW R0, (R1) // fail hard
// Exit this OS thread (like pthread_exit, which eventually
// calls __bsdthread_terminate).
TEXT runtime·exit1(SB),NOSPLIT,$0
MOVW $SYS_bsdthread_terminate, R12
SWI $0x80
MOVW $1234, R0
MOVW $1003, R1
MOVW R0, (R1) // fail hard
TEXT runtime·raise(SB),NOSPLIT,$0
// Ideally we'd send the signal to the current thread,
// not the whole process, but that's too hard on OS X.
JMP runtime·raiseproc(SB)
TEXT runtime·raiseproc(SB),NOSPLIT,$24
MOVW $SYS_getpid, R12
SWI $0x80
// arg 1 pid already in R0 from getpid
MOVW sig+0(FP), R1 // arg 2 - signal
MOVW $1, R2 // arg 3 - posix
MOVW $SYS_kill, R12
SWI $0x80
RET
TEXT runtime·mmap(SB),NOSPLIT,$0
MOVW addr+0(FP), R0
MOVW n+4(FP), R1
MOVW prot+8(FP), R2
MOVW flags+12(FP), R3
MOVW fd+16(FP), R4
MOVW off+20(FP), R5
MOVW $0, R6 // off_t is uint64_t
MOVW $SYS_mmap, R12
SWI $0x80
MOVW R0, ret+24(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT,$0
MOVW addr+0(FP), R0
MOVW n+4(FP), R1
MOVW $SYS_munmap, R12
SWI $0x80
BL.CS notok<>(SB)
RET
TEXT runtime·madvise(SB),NOSPLIT,$0
MOVW addr+0(FP), R0
MOVW n+4(FP), R1
MOVW flags+8(FP), R2
MOVW $SYS_madvise, R12
SWI $0x80
BL.CS notok<>(SB)
RET
TEXT runtime·setitimer(SB),NOSPLIT,$0
MOVW mode+0(FP), R0
MOVW new+4(FP), R1
MOVW old+8(FP), R2
MOVW $SYS_setitimer, R12
SWI $0x80
RET
TEXT runtime·mincore(SB),NOSPLIT,$0
MOVW addr+0(FP), R0
MOVW n+4(FP), R1
MOVW dst+8(FP), R2
MOVW $SYS_mincore, R12
SWI $0x80
MOVW R0, ret+12(FP)
RET
TEXT runtime·walltime(SB), 7, $32
MOVW $8(R13), R0 // timeval
MOVW $0, R1 // zone
MOVW $0, R2 // see issue 16570
MOVW $SYS_gettimeofday, R12
SWI $0x80 // Note: R0 is tv_sec, R1 is tv_usec
CMP $0, R0
BNE inreg
MOVW 8(R13), R0
MOVW 12(R13), R1
inreg:
MOVW R1, R2 // usec
MOVW R0, sec_lo+0(FP)
MOVW $0, R1
MOVW R1, sec_hi+4(FP)
MOVW $1000, R3
MUL R3, R2
MOVW R2, nsec+8(FP)
RET
TEXT runtime·nanotime(SB),NOSPLIT,$32
MOVW $8(R13), R0 // timeval
MOVW $0, R1 // zone
MOVW $0, R2 // see issue 16570
MOVW $SYS_gettimeofday, R12
SWI $0x80 // Note: R0 is tv_sec, R1 is tv_usec
CMP $0, R0
BNE inreg
MOVW 8(R13), R0
MOVW 12(R13), R1
inreg:
MOVW R1, R2
MOVW $1000000000, R3
MULLU R0, R3, (R1, R0)
MOVW $1000, R3
MOVW $0, R4
MUL R3, R2
ADD.S R2, R0
ADC R4, R1
MOVW R0, ret_lo+0(FP)
MOVW R1, ret_hi+4(FP)
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
// Sigtramp's job is to call the actual signal handler.
// It is called with the following arguments on the stack:
// LR "return address" - ignored
// R0 actual handler
// R1 siginfo style - ignored
// R2 signal number
// R3 siginfo
// -4(FP) context, beware that 0(FP) is the saved LR
TEXT runtime·sigtramp(SB),NOSPLIT,$0
// this might be called in external code context,
// where g is not set.
// first save R0, because runtime·load_g will clobber it
MOVM.DB.W [R0], (R13)
MOVB runtime·iscgo(SB), R0
CMP $0, R0
BL.NE runtime·load_g(SB)
CMP $0, g
BNE cont
// fake function call stack frame for badsignal
// we only need to pass R2 (signal number), but
// badsignal will expect R2 at 4(R13), so we also
// push R1 onto stack. turns out we do need R1
// to do sigreturn.
MOVM.DB.W [R1,R2], (R13)
MOVW $runtime·badsignal(SB), R11
BL (R11)
MOVM.IA.W [R1], (R13) // saved infostype
ADD $(4+4), R13 // +4: also need to remove the pushed R0.
MOVW ucontext-4(FP), R0 // load ucontext
B ret
cont:
// Restore R0
MOVM.IA.W (R13), [R0]
// NOTE: some Darwin/ARM kernels always use the main stack to run the
// signal handler. We need to switch to gsignal ourselves.
MOVW g_m(g), R11
MOVW m_gsignal(R11), R5
MOVW (g_stack+stack_hi)(R5), R6
SUB $28, R6
// copy arguments for call to sighandler
MOVW R2, 4(R6) // signal num
MOVW R3, 8(R6) // signal info
MOVW g, 16(R6) // old_g
MOVW context-4(FP), R4
MOVW R4, 12(R6) // context
// Backup ucontext and infostyle
MOVW R4, 20(R6)
MOVW R1, 24(R6)
// switch stack and g
MOVW R6, R13 // sigtramp is not re-entrant, so no need to back up R13.
MOVW R5, g
BL (R0)
// call sigreturn
MOVW 20(R13), R0 // saved ucontext
MOVW 24(R13), R1 // saved infostyle
ret:
MOVW $SYS_sigreturn, R12 // sigreturn(ucontext, infostyle)
SWI $0x80
// if sigreturn fails, we can do nothing but exit
B runtime·exit(SB)
TEXT runtime·sigprocmask(SB),NOSPLIT,$0
MOVW how+0(FP), R0
MOVW new+4(FP), R1
MOVW old+8(FP), R2
MOVW $SYS_pthread_sigmask, R12
SWI $0x80
BL.CS notok<>(SB)
RET
TEXT runtime·sigaction(SB),NOSPLIT,$0
MOVW mode+0(FP), R0
MOVW new+4(FP), R1
MOVW old+8(FP), R2
MOVW $SYS_sigaction, R12
SWI $0x80
RET
TEXT runtime·usleep(SB),NOSPLIT,$12
MOVW usec+0(FP), R0
CALL runtime·usplitR0(SB)
MOVW R0, a-12(SP)
MOVW R1, b-8(SP)
// select(0, 0, 0, 0, &tv)
MOVW $0, R0
MOVW $0, R1
MOVW $0, R2
MOVW $0, R3
MOVW $a-12(SP), R4
MOVW $SYS_select, R12
SWI $0x80
RET
TEXT ·publicationBarrier(SB),NOSPLIT,$-4-0
B runtime·armPublicationBarrier(SB)
TEXT runtime·sysctl(SB),NOSPLIT,$0
MOVW mib+0(FP), R0
MOVW miblen+4(FP), R1
MOVW out+8(FP), R2
MOVW size+12(FP), R3
MOVW dst+16(FP), R4
MOVW ndst+20(FP), R5
MOVW $SYS___sysctl, R12 // syscall entry
SWI $0x80
BCC sysctl_ret
RSB $0, R0, R0
MOVW R0, ret+24(FP)
RET
sysctl_ret:
MOVW $0, R0
MOVW R0, ret+24(FP)
RET
// Thread related functions
// func bsdthread_create(stk, arg unsafe.Pointer, fn uintptr) int32
TEXT runtime·bsdthread_create(SB),NOSPLIT,$0
// Set up arguments to bsdthread_create system call.
// The ones in quotes pass through to the thread callback
// uninterpreted, so we can put whatever we want there.
MOVW fn+8(FP), R0 // "func"
MOVW arg+4(FP), R1 // "arg"
MOVW stk+0(FP), R2 // stack
MOVW $0x01000000, R4 // flags = PTHREAD_START_CUSTOM
MOVW $0, R5 // paranoia
MOVW $SYS_bsdthread_create, R12
SWI $0x80
BCC create_ret
RSB $0, R0, R0
MOVW R0, ret+12(FP)
RET
create_ret:
MOVW $0, R0
MOVW R0, ret+12(FP)
RET
// The thread that bsdthread_create creates starts executing here,
// because we registered this function using bsdthread_register
// at startup.
// R0 = "pthread"
// R1 = mach thread port
// R2 = "func" (= fn)
// R3 = "arg" (= m)
// R4 = stack
// R5 = flags (= 0)
// XXX: how to deal with R4/SP? ref: Libc-594.9.1/arm/pthreads/thread_start.s
TEXT runtime·bsdthread_start(SB),NOSPLIT,$0
MOVW R1, m_procid(R3) // thread port is m->procid
MOVW m_g0(R3), g
MOVW R3, g_m(g)
// ARM don't have runtime·stackcheck(SB)
// disable runfast mode of vfp
EOR R12, R12
WORD $0xeee1ca10 // fmxr fpscr, ip
BL (R2) // fn
BL runtime·exit1(SB)
RET
// int32 bsdthread_register(void)
// registers callbacks for threadstart (see bsdthread_create above
// and wqthread and pthsize (not used). returns 0 on success.
TEXT runtime·bsdthread_register(SB),NOSPLIT,$0
MOVW $runtime·bsdthread_start(SB), R0 // threadstart
MOVW $0, R1 // wqthread, not used by us
MOVW $0, R2 // pthsize, not used by us
MOVW $0, R3 // dummy_value [sic]
MOVW $0, R4 // targetconc_ptr
MOVW $0, R5 // dispatchqueue_offset
MOVW $SYS_bsdthread_register, R12 // bsdthread_register
SWI $0x80
MOVW R0, ret+0(FP)
RET
// uint32 mach_msg_trap(void*, uint32, uint32, uint32, uint32, uint32, uint32)
TEXT runtime·mach_msg_trap(SB),NOSPLIT,$0
MOVW h+0(FP), R0
MOVW op+4(FP), R1
MOVW send_size+8(FP), R2
MOVW rcv_size+12(FP), R3
MOVW rcv_name+16(FP), R4
MOVW timeout+20(FP), R5
MOVW notify+24(FP), R6
MVN $30, R12
SWI $0x80
MOVW R0, ret+28(FP)
RET
TEXT runtime·mach_task_self(SB),NOSPLIT,$0
MVN $27, R12 // task_self_trap
SWI $0x80
MOVW R0, ret+0(FP)
RET
TEXT runtime·mach_thread_self(SB),NOSPLIT,$0
MVN $26, R12 // thread_self_trap
SWI $0x80
MOVW R0, ret+0(FP)
RET
TEXT runtime·mach_reply_port(SB),NOSPLIT,$0
MVN $25, R12 // mach_reply_port
SWI $0x80
MOVW R0, ret+0(FP)
RET
// Mach provides trap versions of the semaphore ops,
// instead of requiring the use of RPC.
// uint32 mach_semaphore_wait(uint32)
TEXT runtime·mach_semaphore_wait(SB),NOSPLIT,$0
MOVW sema+0(FP), R0
MVN $35, R12 // semaphore_wait_trap
SWI $0x80
MOVW R0, ret+4(FP)
RET
// uint32 mach_semaphore_timedwait(uint32, uint32, uint32)
TEXT runtime·mach_semaphore_timedwait(SB),NOSPLIT,$0
MOVW sema+0(FP), R0
MOVW sec+4(FP), R1
MOVW nsec+8(FP), R2
MVN $37, R12 // semaphore_timedwait_trap
SWI $0x80
MOVW R0, ret+12(FP)
RET
// uint32 mach_semaphore_signal(uint32)
TEXT runtime·mach_semaphore_signal(SB),NOSPLIT,$0
MOVW sema+0(FP), R0
MVN $32, R12 // semaphore_signal_trap
SWI $0x80
MOVW R0, ret+4(FP)
RET
// uint32 mach_semaphore_signal_all(uint32)
TEXT runtime·mach_semaphore_signal_all(SB),NOSPLIT,$0
MOVW sema+0(FP), R0
MVN $33, R12 // semaphore_signal_all_trap
SWI $0x80
MOVW R0, ret+4(FP)
RET
// int32 runtime·kqueue(void)
TEXT runtime·kqueue(SB),NOSPLIT,$0
MOVW $SYS_kqueue, R12
SWI $0x80
RSB.CS $0, R0, R0
MOVW R0, ret+0(FP)
RET
// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int events, Timespec *timeout)
TEXT runtime·kevent(SB),NOSPLIT,$0
MOVW $SYS_kevent, R12
MOVW kq+0(FP), R0
MOVW ch+4(FP), R1
MOVW nch+8(FP), R2
MOVW ev+12(FP), R3
MOVW nev+16(FP), R4
MOVW ts+20(FP), R5
SWI $0x80
RSB.CS $0, R0, R0
MOVW R0, ret+24(FP)
RET
// int32 runtime·closeonexec(int32 fd)
TEXT runtime·closeonexec(SB),NOSPLIT,$0
MOVW $SYS_fcntl, R12
MOVW fd+0(FP), R0
MOVW $2, R1 // F_SETFD
MOVW $1, R2 // FD_CLOEXEC
SWI $0x80
RET
// sigaltstack on some darwin/arm version is buggy and will always
// run the signal handler on the main stack, so our sigtramp has
// to do the stack switch ourselves.
TEXT runtime·sigaltstack(SB),NOSPLIT,$0
RET
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