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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, NetBSD
//
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#include "cgo/abi_arm64.h"
#define CLOCK_REALTIME 0
#define CLOCK_MONOTONIC 3
#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_munmap 73
#define SYS_madvise 75
#define SYS_fcntl 92
#define SYS_mmap 197
#define SYS___sysctl 202
#define SYS___sigaltstack14 281
#define SYS___sigprocmask14 293
#define SYS_issetugid 305
#define SYS_getcontext 307
#define SYS_setcontext 308
#define SYS__lwp_create 309
#define SYS__lwp_exit 310
#define SYS__lwp_self 311
#define SYS__lwp_kill 318
#define SYS__lwp_unpark 321
#define SYS___sigaction_sigtramp 340
#define SYS_kqueue 344
#define SYS_sched_yield 350
#define SYS___setitimer50 425
#define SYS___clock_gettime50 427
#define SYS___nanosleep50 430
#define SYS___kevent50 435
#define SYS_pipe2 453
#define SYS_openat 468
#define SYS____lwp_park60 478
// int32 lwp_create(void *context, uintptr flags, void *lwpid)
TEXT runtime·lwp_create(SB),NOSPLIT,$0
MOVD ctxt+0(FP), R0
MOVD flags+8(FP), R1
MOVD lwpid+16(FP), R2
SVC $SYS__lwp_create
BCC ok
NEG R0, R0
ok:
MOVW R0, ret+24(FP)
RET
TEXT runtime·lwp_tramp(SB),NOSPLIT,$0
CMP $0, R1
BEQ nog
CMP $0, R2
BEQ nog
MOVD R0, g_m(R1)
MOVD R1, g
nog:
CALL (R2)
MOVD $0, R0 // crash (not reached)
MOVD R0, (R8)
TEXT ·netbsdMstart(SB),NOSPLIT|TOPFRAME,$0
CALL ·netbsdMstart0(SB)
RET // not reached
TEXT runtime·osyield(SB),NOSPLIT,$0
SVC $SYS_sched_yield
RET
TEXT runtime·lwp_park(SB),NOSPLIT,$0
MOVW clockid+0(FP), R0 // arg 1 - clockid
MOVW flags+4(FP), R1 // arg 2 - flags
MOVD ts+8(FP), R2 // arg 3 - ts
MOVW unpark+16(FP), R3 // arg 4 - unpark
MOVD hint+24(FP), R4 // arg 5 - hint
MOVD unparkhint+32(FP), R5 // arg 6 - unparkhint
SVC $SYS____lwp_park60
MOVW R0, ret+40(FP)
RET
TEXT runtime·lwp_unpark(SB),NOSPLIT,$0
MOVW lwp+0(FP), R0 // arg 1 - lwp
MOVD hint+8(FP), R1 // arg 2 - hint
SVC $SYS__lwp_unpark
MOVW R0, ret+16(FP)
RET
TEXT runtime·lwp_self(SB),NOSPLIT,$0
SVC $SYS__lwp_self
MOVW R0, ret+0(FP)
RET
// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT,$-8
MOVW code+0(FP), R0 // arg 1 - exit status
SVC $SYS_exit
MOVD $0, R0 // If we're still running,
MOVD R0, (R0) // crash
// func exitThread(wait *atomic.Uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0-8
MOVD wait+0(FP), R0
// We're done using the stack.
MOVW $0, R1
STLRW R1, (R0)
SVC $SYS__lwp_exit
JMP 0(PC)
TEXT runtime·open(SB),NOSPLIT|NOFRAME,$-8
MOVD name+0(FP), R0 // arg 1 - pathname
MOVW mode+8(FP), R1 // arg 2 - flags
MOVW perm+12(FP), R2 // arg 3 - mode
SVC $SYS_open
BCC ok
MOVW $-1, R0
ok:
MOVW R0, ret+16(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT,$-8
MOVW fd+0(FP), R0 // arg 1 - fd
SVC $SYS_close
BCC ok
MOVW $-1, R0
ok:
MOVW R0, ret+8(FP)
RET
TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0 // arg 1 - fd
MOVD p+8(FP), R1 // arg 2 - buf
MOVW n+16(FP), R2 // arg 3 - count
SVC $SYS_read
BCC ok
NEG R0, R0
ok:
MOVW R0, ret+24(FP)
RET
// func pipe2(flags int32) (r, w int32, errno int32)
TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
ADD $16, RSP, R0
MOVW flags+0(FP), R1
SVC $SYS_pipe2
BCC pipe2ok
NEG R0, R0
pipe2ok:
MOVW R0, errno+16(FP)
RET
TEXT runtime·write1(SB),NOSPLIT,$-8
MOVD fd+0(FP), R0 // arg 1 - fd
MOVD p+8(FP), R1 // arg 2 - buf
MOVW n+16(FP), R2 // arg 3 - nbyte
SVC $SYS_write
BCC ok
NEG R0, R0
ok:
MOVW R0, ret+24(FP)
RET
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) // sec
MUL R3, R4
SUB R4, R5
MOVW $1000, R4
MUL R4, R5
MOVD R5, 16(RSP) // nsec
MOVD $8(RSP), R0 // arg 1 - rqtp
MOVD $0, R1 // arg 2 - rmtp
SVC $SYS___nanosleep50
RET
TEXT runtime·lwp_kill(SB),NOSPLIT,$0-16
MOVW tid+0(FP), R0 // arg 1 - target
MOVD sig+8(FP), R1 // arg 2 - signo
SVC $SYS__lwp_kill
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$16
SVC $SYS_getpid
// arg 1 - pid (from getpid)
MOVD sig+0(FP), R1 // arg 2 - signo
SVC $SYS_kill
RET
TEXT runtime·setitimer(SB),NOSPLIT,$-8
MOVW mode+0(FP), R0 // arg 1 - which
MOVD new+8(FP), R1 // arg 2 - itv
MOVD old+16(FP), R2 // arg 3 - oitv
SVC $SYS___setitimer50
RET
// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB), NOSPLIT, $32
MOVW $CLOCK_REALTIME, R0 // arg 1 - clock_id
MOVD $8(RSP), R1 // arg 2 - tp
SVC $SYS___clock_gettime50
MOVD 8(RSP), R0 // sec
MOVD 16(RSP), R1 // nsec
// sec is in R0, nsec in R1
MOVD R0, sec+0(FP)
MOVW R1, nsec+8(FP)
RET
// int64 nanotime1(void) so really
// void nanotime1(int64 *nsec)
TEXT runtime·nanotime1(SB), NOSPLIT, $32
MOVD $CLOCK_MONOTONIC, R0 // arg 1 - clock_id
MOVD $8(RSP), R1 // arg 2 - tp
SVC $SYS___clock_gettime50
MOVD 8(RSP), R0 // sec
MOVD 16(RSP), R2 // nsec
// sec is in R0, nsec in R2
// return nsec in R2
MOVD $1000000000, R3
MUL R3, R0
ADD R2, R0
MOVD R0, ret+0(FP)
RET
TEXT runtime·getcontext(SB),NOSPLIT,$-8
MOVD ctxt+0(FP), R0 // arg 1 - context
SVC $SYS_getcontext
BCS fail
RET
fail:
MOVD $0, R0
MOVD R0, (R0) // crash
TEXT runtime·sigprocmask(SB),NOSPLIT,$0
MOVW how+0(FP), R0 // arg 1 - how
MOVD new+8(FP), R1 // arg 2 - set
MOVD old+16(FP), R2 // arg 3 - oset
SVC $SYS___sigprocmask14
BCS fail
RET
fail:
MOVD $0, R0
MOVD R0, (R0) // crash
TEXT sigreturn_tramp<>(SB),NOSPLIT,$-8
MOVD g, R0
SVC $SYS_setcontext
MOVD $0, R0
MOVD R0, (R0) // crash
TEXT runtime·sigaction(SB),NOSPLIT,$-8
MOVW sig+0(FP), R0 // arg 1 - signum
MOVD new+8(FP), R1 // arg 2 - nsa
MOVD old+16(FP), R2 // arg 3 - osa
// arg 4 - tramp
MOVD $sigreturn_tramp<>(SB), R3
MOVW $2, R4 // arg 5 - vers
SVC $SYS___sigaction_sigtramp
BCS fail
RET
fail:
MOVD $0, R0
MOVD R0, (R0) // crash
// XXX ???
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
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)
// Unclobber g for now (kernel uses it as ucontext ptr)
// See https://github.com/golang/go/issues/30824#issuecomment-492772426
// This is only correct in the non-cgo case.
// XXX should use lwp_getprivate as suggested.
// 8*36 is ucontext.uc_mcontext.__gregs[_REG_X28]
MOVD 8*36(g), g
// this might be called in external code context,
// where g is not set.
// first save R0, because runtime·load_g will clobber it
MOVD R0, 8(RSP) // signum
MOVB runtime·iscgo(SB), R0
CMP $0, R0
// XXX branch destination
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
BL runtime·sigtrampgo<ABIInternal>(SB)
// Restore callee-save registers.
RESTORE_R19_TO_R28(8*4)
RESTORE_F8_TO_F15(8*14)
RET
TEXT runtime·mmap(SB),NOSPLIT,$0
MOVD addr+0(FP), R0 // arg 1 - addr
MOVD n+8(FP), R1 // arg 2 - len
MOVW prot+16(FP), R2 // arg 3 - prot
MOVW flags+20(FP), R3 // arg 4 - flags
MOVW fd+24(FP), R4 // arg 5 - fd
MOVW $0, R5 // arg 6 - pad
MOVD off+28(FP), R6 // arg 7 - offset
SVC $SYS_mmap
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
TEXT runtime·munmap(SB),NOSPLIT,$0
MOVD addr+0(FP), R0 // arg 1 - addr
MOVD n+8(FP), R1 // arg 2 - len
SVC $SYS_munmap
BCS fail
RET
fail:
MOVD $0, R0
MOVD R0, (R0) // crash
TEXT runtime·madvise(SB),NOSPLIT,$0
MOVD addr+0(FP), R0 // arg 1 - addr
MOVD n+8(FP), R1 // arg 2 - len
MOVW flags+16(FP), R2 // arg 3 - behav
SVC $SYS_madvise
BCC ok
MOVD $-1, R0
ok:
MOVD R0, ret+24(FP)
RET
TEXT runtime·sigaltstack(SB),NOSPLIT,$0
MOVD new+0(FP), R0 // arg 1 - nss
MOVD old+8(FP), R1 // arg 2 - oss
SVC $SYS___sigaltstack14
BCS fail
RET
fail:
MOVD $0, R0
MOVD R0, (R0) // crash
TEXT runtime·sysctl(SB),NOSPLIT,$0
MOVD mib+0(FP), R0 // arg 1 - name
MOVW miblen+8(FP), R1 // arg 2 - namelen
MOVD out+16(FP), R2 // arg 3 - oldp
MOVD size+24(FP), R3 // arg 4 - oldlenp
MOVD dst+32(FP), R4 // arg 5 - newp
MOVD ndst+40(FP), R5 // arg 6 - newlen
SVC $SYS___sysctl
BCC ok
NEG R0, R0
ok:
MOVW R0, ret+48(FP)
RET
// int32 runtime·kqueue(void)
TEXT runtime·kqueue(SB),NOSPLIT,$0
MOVD $0, R0
SVC $SYS_kqueue
BCC ok
NEG R0, R0
ok:
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 // arg 1 - kq
MOVD ch+8(FP), R1 // arg 2 - changelist
MOVW nch+16(FP), R2 // arg 3 - nchanges
MOVD ev+24(FP), R3 // arg 4 - eventlist
MOVW nev+32(FP), R4 // arg 5 - nevents
MOVD ts+40(FP), R5 // arg 6 - timeout
SVC $SYS___kevent50
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 // fd
MOVW cmd+4(FP), R1 // cmd
MOVW arg+8(FP), R2 // arg
SVC $SYS_fcntl
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
// void runtime·closeonexec(int32 fd)
TEXT runtime·closeonexec(SB),NOSPLIT,$0
MOVW fd+0(FP), R0 // arg 1 - fd
MOVW $F_SETFD, R1
MOVW $FD_CLOEXEC, R2
SVC $SYS_fcntl
RET
// func issetugid() int32
TEXT runtime·issetugid(SB),NOSPLIT|NOFRAME,$0
SVC $SYS_issetugid
MOVW R0, ret+0(FP)
RET
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