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Mini Shell
Mini Shell
// Copyright 2019 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, FreeBSD
// /usr/src/sys/kern/syscalls.master for syscall numbers.
//
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#include "cgo/abi_arm64.h"
#define CLOCK_REALTIME 0
#define CLOCK_MONOTONIC 4
#define FD_CLOEXEC 1
#define F_SETFD 2
#define F_GETFL 3
#define F_SETFL 4
#define O_NONBLOCK 4
#define SYS_exit 1
#define SYS_read 3
#define SYS_write 4
#define SYS_open 5
#define SYS_close 6
#define SYS_getpid 20
#define SYS_kill 37
#define SYS_sigaltstack 53
#define SYS_munmap 73
#define SYS_madvise 75
#define SYS_setitimer 83
#define SYS_fcntl 92
#define SYS___sysctl 202
#define SYS_nanosleep 240
#define SYS_issetugid 253
#define SYS_clock_gettime 232
#define SYS_sched_yield 331
#define SYS_sigprocmask 340
#define SYS_kqueue 362
#define SYS_kevent 363
#define SYS_sigaction 416
#define SYS_thr_exit 431
#define SYS_thr_self 432
#define SYS_thr_kill 433
#define SYS__umtx_op 454
#define SYS_thr_new 455
#define SYS_mmap 477
#define SYS_cpuset_getaffinity 487
#define SYS_pipe2 542
TEXT emptyfunc<>(SB),0,$0-0
RET
// func sys_umtx_op(addr *uint32, mode int32, val uint32, uaddr1 uintptr, ut *umtx_time) int32
TEXT runtime·sys_umtx_op(SB),NOSPLIT,$0
MOVD addr+0(FP), R0
MOVW mode+8(FP), R1
MOVW val+12(FP), R2
MOVD uaddr1+16(FP), R3
MOVD ut+24(FP), R4
MOVD $SYS__umtx_op, R8
SVC
BCC ok
NEG R0, R0
ok:
MOVW R0, ret+32(FP)
RET
// func thr_new(param *thrparam, size int32) int32
TEXT runtime·thr_new(SB),NOSPLIT,$0
MOVD param+0(FP), R0
MOVW size+8(FP), R1
MOVD $SYS_thr_new, R8
SVC
BCC ok
NEG R0, R0
ok:
MOVW R0, ret+16(FP)
RET
// func thr_start()
TEXT runtime·thr_start(SB),NOSPLIT,$0
// set up g
MOVD m_g0(R0), g
MOVD R0, g_m(g)
BL emptyfunc<>(SB) // fault if stack check is wrong
BL runtime·mstart(SB)
MOVD $2, R8 // crash (not reached)
MOVD R8, (R8)
RET
// func exit(code int32)
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
MOVW code+0(FP), R0
MOVD $SYS_exit, R8
SVC
MOVD $0, R0
MOVD R0, (R0)
// func exitThread(wait *atomic.Uint32)
TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8
MOVD wait+0(FP), R0
// We're done using the stack.
MOVW $0, R1
STLRW R1, (R0)
MOVW $0, R0
MOVD $SYS_thr_exit, R8
SVC
JMP 0(PC)
// func open(name *byte, mode, perm int32) int32
TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
MOVD name+0(FP), R0
MOVW mode+8(FP), R1
MOVW perm+12(FP), R2
MOVD $SYS_open, R8
SVC
BCC ok
MOVW $-1, R0
ok:
MOVW R0, ret+16(FP)
RET
// func closefd(fd int32) int32
TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
MOVW fd+0(FP), R0
MOVD $SYS_close, R8
SVC
BCC ok
MOVW $-1, R0
ok:
MOVW R0, ret+8(FP)
RET
// func pipe2(flags int32) (r, w int32, errno int32)
TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
MOVD $r+8(FP), R0
MOVW flags+0(FP), R1
MOVD $SYS_pipe2, R8
SVC
BCC ok
NEG R0, R0
ok:
MOVW R0, errno+16(FP)
RET
// func write1(fd uintptr, p unsafe.Pointer, n int32) int32
TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0-28
MOVD fd+0(FP), R0
MOVD p+8(FP), R1
MOVW n+16(FP), R2
MOVD $SYS_write, R8
SVC
BCC ok
NEG R0, R0 // caller expects negative errno
ok:
MOVW R0, ret+24(FP)
RET
// func read(fd int32, p unsafe.Pointer, n int32) int32
TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
MOVW fd+0(FP), R0
MOVD p+8(FP), R1
MOVW n+16(FP), R2
MOVD $SYS_read, R8
SVC
BCC ok
NEG R0, R0 // caller expects negative errno
ok:
MOVW R0, ret+24(FP)
RET
// func usleep(usec uint32)
TEXT runtime·usleep(SB),NOSPLIT,$24-4
MOVWU usec+0(FP), R3
MOVD R3, R5
MOVW $1000000, R4
UDIV R4, R3
MOVD R3, 8(RSP)
MUL R3, R4
SUB R4, R5
MOVW $1000, R4
MUL R4, R5
MOVD R5, 16(RSP)
// nanosleep(&ts, 0)
ADD $8, RSP, R0
MOVD $0, R1
MOVD $SYS_nanosleep, R8
SVC
RET
// func thr_self() thread
TEXT runtime·thr_self(SB),NOSPLIT,$8-8
MOVD $ptr-8(SP), R0 // arg 1 &8(SP)
MOVD $SYS_thr_self, R8
SVC
MOVD ptr-8(SP), R0
MOVD R0, ret+0(FP)
RET
// func thr_kill(t thread, sig int)
TEXT runtime·thr_kill(SB),NOSPLIT,$0-16
MOVD tid+0(FP), R0 // arg 1 pid
MOVD sig+8(FP), R1 // arg 2 sig
MOVD $SYS_thr_kill, R8
SVC
RET
// func raiseproc(sig uint32)
TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
MOVD $SYS_getpid, R8
SVC
MOVW sig+0(FP), R1
MOVD $SYS_kill, R8
SVC
RET
// func setitimer(mode int32, new, old *itimerval)
TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
MOVW mode+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
MOVD $SYS_setitimer, R8
SVC
RET
// func fallback_walltime() (sec int64, nsec int32)
TEXT runtime·fallback_walltime(SB),NOSPLIT,$24-12
MOVW $CLOCK_REALTIME, R0
MOVD $8(RSP), R1
MOVD $SYS_clock_gettime, R8
SVC
MOVD 8(RSP), R0 // sec
MOVW 16(RSP), R1 // nsec
MOVD R0, sec+0(FP)
MOVW R1, nsec+8(FP)
RET
// func fallback_nanotime() int64
TEXT runtime·fallback_nanotime(SB),NOSPLIT,$24-8
MOVD $CLOCK_MONOTONIC, R0
MOVD $8(RSP), R1
MOVD $SYS_clock_gettime, R8
SVC
MOVD 8(RSP), R0 // sec
MOVW 16(RSP), R2 // nsec
// sec is in R0, nsec in R2
// return nsec in R2
MOVD $1000000000, R3
MUL R3, R0
ADD R2, R0
MOVD R0, ret+0(FP)
RET
// func asmSigaction(sig uintptr, new, old *sigactiont) int32
TEXT runtime·asmSigaction(SB),NOSPLIT|NOFRAME,$0
MOVD sig+0(FP), R0 // arg 1 sig
MOVD new+8(FP), R1 // arg 2 act
MOVD old+16(FP), R2 // arg 3 oact
MOVD $SYS_sigaction, R8
SVC
BCC ok
MOVW $-1, R0
ok:
MOVW R0, ret+24(FP)
RET
// func sigfwd(fn uintptr, sig uint32, info *siginfo, ctx unsafe.Pointer)
TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
MOVW sig+8(FP), R0
MOVD info+16(FP), R1
MOVD ctx+24(FP), R2
MOVD fn+0(FP), R11
BL (R11)
RET
// func sigtramp()
TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$176
// Save callee-save registers in the case of signal forwarding.
// Please refer to https://golang.org/issue/31827 .
SAVE_R19_TO_R28(8*4)
SAVE_F8_TO_F15(8*14)
// 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, 8(RSP)
MOVBU runtime·iscgo(SB), R0
CMP $0, R0
BEQ 2(PC)
BL runtime·load_g(SB)
#ifdef GOEXPERIMENT_regabiargs
// Restore signum to R0.
MOVW 8(RSP), R0
// R1 and R2 already contain info and ctx, respectively.
#else
MOVD R1, 16(RSP)
MOVD R2, 24(RSP)
#endif
MOVD $runtime·sigtrampgo<ABIInternal>(SB), R3
BL (R3)
// Restore callee-save registers.
RESTORE_R19_TO_R28(8*4)
RESTORE_F8_TO_F15(8*14)
RET
// func mmap(addr uintptr, n uintptr, prot int, flags int, fd int, off int64) (ret uintptr, err error)
TEXT runtime·mmap(SB),NOSPLIT|NOFRAME,$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
MOVD $SYS_mmap, R8
SVC
BCS fail
MOVD R0, p+32(FP)
MOVD $0, err+40(FP)
RET
fail:
MOVD $0, p+32(FP)
MOVD R0, err+40(FP)
RET
// func munmap(addr uintptr, n uintptr) (err error)
TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVD $SYS_munmap, R8
SVC
BCS fail
RET
fail:
MOVD $0, R0
MOVD R0, (R0) // crash
// func madvise(addr unsafe.Pointer, n uintptr, flags int32) int32
TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R0
MOVD n+8(FP), R1
MOVW flags+16(FP), R2
MOVD $SYS_madvise, R8
SVC
BCC ok
MOVW $-1, R0
ok:
MOVW R0, ret+24(FP)
RET
// func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32
TEXT runtime·sysctl(SB),NOSPLIT,$0
MOVD mib+0(FP), R0
MOVD miblen+8(FP), R1
MOVD out+16(FP), R2
MOVD size+24(FP), R3
MOVD dst+32(FP), R4
MOVD ndst+40(FP), R5
MOVD $SYS___sysctl, R8
SVC
BCC ok
NEG R0, R0
ok:
MOVW R0, ret+48(FP)
RET
// func sigaltstack(new, old *stackt)
TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
MOVD new+0(FP), R0
MOVD old+8(FP), R1
MOVD $SYS_sigaltstack, R8
SVC
BCS fail
RET
fail:
MOVD $0, R0
MOVD R0, (R0) // crash
// func osyield()
TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
MOVD $SYS_sched_yield, R8
SVC
RET
// func sigprocmask(how int32, new, old *sigset)
TEXT runtime·sigprocmask(SB),NOSPLIT|NOFRAME,$0-24
MOVW how+0(FP), R0
MOVD new+8(FP), R1
MOVD old+16(FP), R2
MOVD $SYS_sigprocmask, R8
SVC
BCS fail
RET
fail:
MOVD $0, R0
MOVD R0, (R0) // crash
// func cpuset_getaffinity(level int, which int, id int64, size int, mask *byte) int32
TEXT runtime·cpuset_getaffinity(SB),NOSPLIT|NOFRAME,$0-44
MOVD level+0(FP), R0
MOVD which+8(FP), R1
MOVD id+16(FP), R2
MOVD size+24(FP), R3
MOVD mask+32(FP), R4
MOVD $SYS_cpuset_getaffinity, R8
SVC
BCC ok
MOVW $-1, R0
ok:
MOVW R0, ret+40(FP)
RET
// func kqueue() int32
TEXT runtime·kqueue(SB),NOSPLIT|NOFRAME,$0
MOVD $SYS_kqueue, R8
SVC
BCC ok
MOVW $-1, R0
ok:
MOVW R0, ret+0(FP)
RET
// func kevent(kq int, ch unsafe.Pointer, nch int, ev unsafe.Pointer, nev int, ts *Timespec) (n int, err error)
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
MOVD $SYS_kevent, R8
SVC
BCC ok
NEG R0, R0
ok:
MOVW R0, ret+48(FP)
RET
// func fcntl(fd, cmd, arg int32) (int32, int32)
TEXT runtime·fcntl(SB),NOSPLIT,$0
MOVW fd+0(FP), R0
MOVW cmd+4(FP), R1
MOVW arg+8(FP), R2
MOVD $SYS_fcntl, R8
SVC
BCC noerr
MOVW $-1, R1
MOVW R1, ret+16(FP)
MOVW R0, errno+20(FP)
RET
noerr:
MOVW R0, ret+16(FP)
MOVW $0, errno+20(FP)
RET
// func closeonexec(fd int32)
TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0
MOVD $F_SETFD, R1
MOVD $FD_CLOEXEC, R2
MOVD $SYS_fcntl, R8
SVC
RET
// func getCntxct(physical bool) uint32
TEXT runtime·getCntxct(SB),NOSPLIT,$0
MOVB physical+0(FP), R0
CMP $0, R0
BEQ 3(PC)
// get CNTPCT (Physical Count Register) into R0
MRS CNTPCT_EL0, R0 // SIGILL
B 2(PC)
// get CNTVCT (Virtual Count Register) into R0
MRS CNTVCT_EL0, R0
MOVW R0, ret+8(FP)
RET
// func issetugid() int32
TEXT runtime·issetugid(SB),NOSPLIT|NOFRAME,$0
MOVD $SYS_issetugid, R8
SVC
MOVW R0, ret+0(FP)
RET
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