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// Copyright 2015 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 ARM64, 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_setitimer 83
#define SYS___sysctl 202
#define SYS_sigprocmask 48
#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
MOVD $0, R8
MOVD R8, (R8)
B 0(PC)
TEXT runtime·open(SB),NOSPLIT,$0
MOVD name+0(FP), R0
MOVW mode+8(FP), R1
MOVW perm+12(FP), R2
MOVD $SYS_open, R16
SVC $0x80
CSINV LO, R0, ZR, R0
MOVW R0, ret+16(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW $SYS_close, R16
SVC $0x80
CSINV LO, R0, ZR, R0
MOVW R0, ret+8(FP)
RET
TEXT runtime·write(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVD p+8(FP), R1
MOVW n+16(FP), R2
MOVW $SYS_write, R16
SVC $0x80
CSINV LO, R0, ZR, R0
MOVW R0, ret+24(FP)
RET
TEXT runtime·read(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVD p+8(FP), R1
MOVW n+16(FP), R2
MOVW $SYS_read, R16
SVC $0x80
CSINV LO, R0, ZR, R0
MOVW R0, ret+24(FP)
RET
TEXT runtime·exit(SB),NOSPLIT,$-8
MOVW code+0(FP), R0
MOVW $SYS_exit, R16
SVC $0x80
MOVD $1234, R0
MOVD $1002, R1
MOVD 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, R16
SVC $0x80
MOVD $1234, R0
MOVD $1003, R1
MOVD R0, (R1) // fail hard
TEXT runtime·raise(SB),NOSPLIT,$0
MOVW $SYS_getpid, R16
SVC $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, R16
SVC $0x80
RET
TEXT runtime·mmap(SB),NOSPLIT,$0
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVW prot+16(FP), R2
MOVW flags+20(FP), R3
MOVW fd+24(FP), R4
MOVW off+28(FP), R5
MOVW $SYS_mmap, R16
SVC $0x80
MOVD R0, ret+32(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT,$0
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVW $SYS_munmap, R16
SVC $0x80
BCC 2(PC)
BL notok<>(SB)
RET
TEXT runtime·madvise(SB),NOSPLIT,$0
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVW flags+16(FP), R2
MOVW $SYS_madvise, R16
SVC $0x80
BCC 2(PC)
BL notok<>(SB)
RET
TEXT runtime·setitimer(SB),NOSPLIT,$0
MOVW mode+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
MOVW $SYS_setitimer, R16
SVC $0x80
RET
TEXT time·now(SB),NOSPLIT,$32-12
MOVD RSP, R0 // timeval
MOVD R0, R9 // this is how dyld calls gettimeofday
MOVW $0, R1 // zone
MOVW $SYS_gettimeofday, R16
SVC $0x80 // Note: x0 is tv_sec, w1 is tv_usec
MOVD R0, sec+0(FP)
MOVW $1000, R3
MUL R3, R1
MOVW R1, nsec+8(FP)
RET
TEXT runtime·nanotime(SB),NOSPLIT,$32
MOVD RSP, R0 // timeval
MOVD R0, R9 // this is how dyld calls gettimeofday
MOVW $0, R1 // zone
MOVW $SYS_gettimeofday, R16
SVC $0x80 // Note: x0 is tv_sec, w1 is tv_usec
MOVW $1000000000, R3
MUL R3, R0
MOVW $1000, R3
MUL R3, R1
ADD R1, R0
MOVD R0, ret+0(FP)
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
// R4 context
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
MOVD.W R0, -16(RSP) // note: stack must be 16-byte aligned
MOVB runtime·iscgo(SB), R0
CMP $0, R0
BEQ 2(PC)
BL 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 8(RSP), so we also
// push R1 onto stack. turns out we do need R1
// to do sigreturn.
MOVD.W R1, -16(RSP)
MOVD R2, 8(RSP)
MOVD R4, 24(RSP) // save ucontext, badsignal might clobber R4
MOVD $runtime·badsignal(SB), R26
BL (R26)
MOVD 0(RSP), R1 // saved infostype
MOVD 24(RSP), R0 // the ucontext
ADD $(16+16), RSP
B ret
cont:
// Restore R0
MOVD.P 16(RSP), R0
// NOTE: some Darwin/ARM kernels always use the main stack to run the
// signal handler. We need to switch to gsignal ourselves.
MOVD g_m(g), R11
MOVD m_gsignal(R11), R5
MOVD (g_stack+stack_hi)(R5), R6
SUB $64, R6
// copy arguments for call to sighandler
MOVD R2, 8(R6) // signal num
MOVD R3, 16(R6) // signal info
MOVD R4, 24(R6) // context
MOVD g, 32(R6) // old_g
// Backup ucontext and infostyle
MOVD R4, 40(R6)
MOVD R1, 48(R6)
// switch stack and g
MOVD R6, RSP // sigtramp can not re-entrant, so no need to back up RSP.
MOVD R5, g
BL (R0)
// call sigreturn
MOVD 40(RSP), R0 // saved ucontext
MOVD 48(RSP), R1 // saved infostyle
ret:
MOVW $SYS_sigreturn, R16 // sigreturn(ucontext, infostyle)
SVC $0x80
// if sigreturn fails, we can do nothing but exit
B runtime·exit(SB)
TEXT runtime·sigprocmask(SB),NOSPLIT,$0
MOVW sig+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
MOVW $SYS_sigprocmask, R16
SVC $0x80
BCC 2(PC)
BL notok<>(SB)
RET
TEXT runtime·sigaction(SB),NOSPLIT,$0
MOVW mode+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
MOVW $SYS_sigaction, R16
SVC $0x80
BCC 2(PC)
BL notok<>(SB)
RET
TEXT runtime·usleep(SB),NOSPLIT,$12
MOVW usec+0(FP), R0
MOVW R0, R1
MOVW $1000000, R2
UDIV R2, R0
MUL R0, R2
SUB R2, R1
MOVD R0, 0(RSP)
MOVW R1, 8(RSP)
// select(0, 0, 0, 0, &tv)
MOVW $0, R0
MOVW $0, R1
MOVW $0, R2
MOVW $0, R3
MOVD RSP, R4
MOVW $SYS_select, R16
SVC $0x80
RET
TEXT runtime·sysctl(SB),NOSPLIT,$0
MOVD mib+0(FP), R0
MOVW miblen+8(FP), R1
MOVD out+16(FP), R2
MOVD size+24(FP), R3
MOVD dst+32(FP), R4
MOVD ndst+40(FP), R5
MOVW $SYS___sysctl, R16
SVC $0x80
BCC ok
NEG R0, R0
MOVW R0, ret+48(FP)
RET
ok:
MOVW $0, R0
MOVW R0, ret+48(FP)
RET
// Thread related functions
// Note: On darwin/arm64, it is no longer possible to use bsdthread_register
// as the libc is always linked in. The runtime must use runtime/cgo to
// create threads, so all thread related functions will just exit with a
// unique status.
// void bsdthread_create(void *stk, M *m, G *g, void (*fn)(void))
TEXT runtime·bsdthread_create(SB),NOSPLIT,$0
MOVD $44, R0
MOVW $SYS_exit, R16
SVC $0x80
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)
TEXT runtime·bsdthread_start(SB),NOSPLIT,$0
MOVD $45, R0
MOVW $SYS_exit, R16
SVC $0x80
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
MOVD $46, R0
MOVW $SYS_exit, R16
SVC $0x80
RET
// uint32 mach_msg_trap(void*, uint32, uint32, uint32, uint32, uint32, uint32)
TEXT runtime·mach_msg_trap(SB),NOSPLIT,$0
MOVD h+0(FP), R0
MOVW op+8(FP), R1
MOVW send_size+12(FP), R2
MOVW rcv_size+16(FP), R3
MOVW rcv_name+20(FP), R4
MOVW timeout+24(FP), R5
MOVW notify+28(FP), R6
MOVN $30, R16
SVC $0x80
MOVW R0, ret+32(FP)
RET
TEXT runtime·mach_task_self(SB),NOSPLIT,$0
MOVN $27, R16 // task_self_trap
SVC $0x80
MOVW R0, ret+0(FP)
RET
TEXT runtime·mach_thread_self(SB),NOSPLIT,$0
MOVN $26, R16 // thread_self_trap
SVC $0x80
MOVW R0, ret+0(FP)
RET
TEXT runtime·mach_reply_port(SB),NOSPLIT,$0
MOVN $25, R16 // mach_reply_port
SVC $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
MOVN $35, R16 // semaphore_wait_trap
SVC $0x80
MOVW R0, ret+8(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
MOVN $37, R16 // semaphore_timedwait_trap
SVC $0x80
MOVW R0, ret+16(FP)
RET
// uint32 mach_semaphore_signal(uint32)
TEXT runtime·mach_semaphore_signal(SB),NOSPLIT,$0
MOVW sema+0(FP), R0
MOVN $32, R16 // semaphore_signal_trap
SVC $0x80
MOVW R0, ret+8(FP)
RET
// uint32 mach_semaphore_signal_all(uint32)
TEXT runtime·mach_semaphore_signal_all(SB),NOSPLIT,$0
MOVW sema+0(FP), R0
MOVN $33, R16 // semaphore_signal_all_trap
SVC $0x80
MOVW R0, ret+8(FP)
RET
// int32 runtime·kqueue(void)
TEXT runtime·kqueue(SB),NOSPLIT,$0
MOVW $SYS_kqueue, R16
SVC $0x80
BCC 2(PC)
NEG R0, R0
MOVW R0, ret+0(FP)
RET
// int32 runtime·kevent(int kq, Kevent *ch, int nch, Kevent *ev, int nev, Timespec *ts)
TEXT runtime·kevent(SB),NOSPLIT,$0
MOVW kq+0(FP), R0
MOVD ch+8(FP), R1
MOVW nch+16(FP), R2
MOVD ev+24(FP), R3
MOVW nev+32(FP), R4
MOVD ts+40(FP), R5
MOVW $SYS_kevent, R16
SVC $0x80
BCC 2(PC)
NEG R0, R0
MOVW R0, ret+48(FP)
RET
// int32 runtime·closeonexec(int32 fd)
TEXT runtime·closeonexec(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW $2, R1 // F_SETFD
MOVW $1, R2 // FD_CLOEXEC
MOVW $SYS_fcntl, R16
SVC $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