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Mini Shell
Mini Shell
// Copyright 2020 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 mips64, OpenBSD
// /usr/src/sys/kern/syscalls.master for syscall numbers.
//
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#define CLOCK_REALTIME $0
#define CLOCK_MONOTONIC $3
// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
MOVW code+0(FP), R4 // arg 1 - status
MOVV $1, R2 // sys_exit
SYSCALL
BEQ R7, 3(PC)
MOVV $0, R2 // crash on syscall failure
MOVV R2, (R2)
RET
// func exitThread(wait *uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0
MOVV wait+0(FP), R4 // arg 1 - notdead
MOVV $302, R2 // sys___threxit
SYSCALL
MOVV $0, R2 // crash on syscall failure
MOVV R2, (R2)
JMP 0(PC)
TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0
MOVV name+0(FP), R4 // arg 1 - path
MOVW mode+8(FP), R5 // arg 2 - mode
MOVW perm+12(FP), R6 // arg 3 - perm
MOVV $5, R2 // sys_open
SYSCALL
BEQ R7, 2(PC)
MOVW $-1, R2
MOVW R2, ret+16(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R4 // arg 1 - fd
MOVV $6, R2 // sys_close
SYSCALL
BEQ R7, 2(PC)
MOVW $-1, R2
MOVW R2, ret+8(FP)
RET
TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R4 // arg 1 - fd
MOVV p+8(FP), R5 // arg 2 - buf
MOVW n+16(FP), R6 // arg 3 - nbyte
MOVV $3, R2 // sys_read
SYSCALL
BEQ R7, 2(PC)
SUBVU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+24(FP)
RET
// func pipe() (r, w int32, errno int32)
TEXT runtime·pipe(SB),NOSPLIT|NOFRAME,$0-12
MOVV $r+0(FP), R4
MOVW $0, R5
MOVV $101, R2 // sys_pipe2
SYSCALL
BEQ R7, 2(PC)
SUBVU R2, R0, R2 // caller expects negative errno
MOVW R2, errno+8(FP)
RET
// func pipe2(flags int32) (r, w int32, errno int32)
TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
MOVV $r+8(FP), R4
MOVW flags+0(FP), R5
MOVV $101, R2 // sys_pipe2
SYSCALL
BEQ R7, 2(PC)
SUBVU R2, R0, R2 // caller expects negative errno
MOVW R2, errno+16(FP)
RET
TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0
MOVV fd+0(FP), R4 // arg 1 - fd
MOVV p+8(FP), R5 // arg 2 - buf
MOVW n+16(FP), R6 // arg 3 - nbyte
MOVV $4, R2 // sys_write
SYSCALL
BEQ R7, 2(PC)
SUBVU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+24(FP)
RET
TEXT runtime·usleep(SB),NOSPLIT,$24-4
MOVWU usec+0(FP), R3
MOVV R3, R5
MOVW $1000000, R4
DIVVU R4, R3
MOVV LO, R3
MOVV R3, 8(R29) // tv_sec
MOVW $1000, R4
MULVU R3, R4
MOVV LO, R4
SUBVU R4, R5
MOVV R5, 16(R29) // tv_nsec
ADDV $8, R29, R4 // arg 1 - rqtp
MOVV $0, R5 // arg 2 - rmtp
MOVV $91, R2 // sys_nanosleep
SYSCALL
RET
TEXT runtime·getthrid(SB),NOSPLIT,$0-4
MOVV $299, R2 // sys_getthrid
SYSCALL
MOVW R2, ret+0(FP)
RET
TEXT runtime·thrkill(SB),NOSPLIT,$0-16
MOVW tid+0(FP), R4 // arg 1 - tid
MOVV sig+8(FP), R5 // arg 2 - signum
MOVW $0, R6 // arg 3 - tcb
MOVV $119, R2 // sys_thrkill
SYSCALL
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$0
MOVV $20, R4 // sys_getpid
SYSCALL
MOVV R2, R4 // arg 1 - pid
MOVW sig+0(FP), R5 // arg 2 - signum
MOVV $122, R2 // sys_kill
SYSCALL
RET
TEXT runtime·mmap(SB),NOSPLIT,$0
MOVV addr+0(FP), R4 // arg 1 - addr
MOVV n+8(FP), R5 // arg 2 - len
MOVW prot+16(FP), R6 // arg 3 - prot
MOVW flags+20(FP), R7 // arg 4 - flags
MOVW fd+24(FP), R8 // arg 5 - fd
MOVW $0, R9 // arg 6 - pad
MOVW off+28(FP), R10 // arg 7 - offset
MOVV $197, R2 // sys_mmap
SYSCALL
MOVV $0, R4
BEQ R7, 3(PC)
MOVV R2, R4 // if error, move to R4
MOVV $0, R2
MOVV R2, p+32(FP)
MOVV R4, err+40(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT,$0
MOVV addr+0(FP), R4 // arg 1 - addr
MOVV n+8(FP), R5 // arg 2 - len
MOVV $73, R2 // sys_munmap
SYSCALL
BEQ R7, 3(PC)
MOVV $0, R2 // crash on syscall failure
MOVV R2, (R2)
RET
TEXT runtime·madvise(SB),NOSPLIT,$0
MOVV addr+0(FP), R4 // arg 1 - addr
MOVV n+8(FP), R5 // arg 2 - len
MOVW flags+16(FP), R6 // arg 2 - flags
MOVV $75, R2 // sys_madvise
SYSCALL
BEQ R7, 2(PC)
MOVW $-1, R2
MOVW R2, ret+24(FP)
RET
TEXT runtime·setitimer(SB),NOSPLIT,$0
MOVW mode+0(FP), R4 // arg 1 - mode
MOVV new+8(FP), R5 // arg 2 - new value
MOVV old+16(FP), R6 // arg 3 - old value
MOVV $69, R2 // sys_setitimer
SYSCALL
RET
// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB), NOSPLIT, $32
MOVW CLOCK_REALTIME, R4 // arg 1 - clock_id
MOVV $8(R29), R5 // arg 2 - tp
MOVV $87, R2 // sys_clock_gettime
SYSCALL
MOVV 8(R29), R4 // sec
MOVV 16(R29), R5 // nsec
MOVV R4, sec+0(FP)
MOVW R5, nsec+8(FP)
RET
// int64 nanotime1(void) so really
// void nanotime1(int64 *nsec)
TEXT runtime·nanotime1(SB),NOSPLIT,$32
MOVW CLOCK_MONOTONIC, R4 // arg 1 - clock_id
MOVV $8(R29), R5 // arg 2 - tp
MOVV $87, R2 // sys_clock_gettime
SYSCALL
MOVV 8(R29), R3 // sec
MOVV 16(R29), R5 // nsec
MOVV $1000000000, R4
MULVU R4, R3
MOVV LO, R3
ADDVU R5, R3
MOVV R3, ret+0(FP)
RET
TEXT runtime·sigaction(SB),NOSPLIT,$0
MOVW sig+0(FP), R4 // arg 1 - signum
MOVV new+8(FP), R5 // arg 2 - new sigaction
MOVV old+16(FP), R6 // arg 3 - old sigaction
MOVV $46, R2 // sys_sigaction
SYSCALL
BEQ R7, 3(PC)
MOVV $3, R2 // crash on syscall failure
MOVV R2, (R2)
RET
TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$0
MOVW how+0(FP), R4 // arg 1 - mode
MOVW new+4(FP), R5 // arg 2 - new
MOVV $48, R2 // sys_sigprocmask
SYSCALL
BEQ R7, 3(PC)
MOVV $3, R2 // crash on syscall failure
MOVV R2, (R2)
MOVW R2, ret+8(FP)
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
MOVW sig+8(FP), R4
MOVV info+16(FP), R5
MOVV ctx+24(FP), R6
MOVV fn+0(FP), R25 // Must use R25, needed for PIC code.
CALL (R25)
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$192
// initialize REGSB = PC&0xffffffff00000000
BGEZAL R0, 1(PC)
SRLV $32, R31, RSB
SLLV $32, RSB
// this might be called in external code context,
// where g is not set.
MOVB runtime·iscgo(SB), R1
BEQ R1, 2(PC)
JAL runtime·load_g(SB)
MOVW R4, 8(R29)
MOVV R5, 16(R29)
MOVV R6, 24(R29)
MOVV $runtime·sigtrampgo(SB), R1
JAL (R1)
RET
// int32 tfork(void *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
TEXT runtime·tfork(SB),NOSPLIT,$0
// Copy mp, gp and fn off parent stack for use by child.
MOVV mm+16(FP), R16
MOVV gg+24(FP), R17
MOVV fn+32(FP), R18
MOVV param+0(FP), R4 // arg 1 - param
MOVV psize+8(FP), R5 // arg 2 - psize
MOVV $8, R2 // sys___tfork
SYSCALL
// Return if syscall failed.
BEQ R7, 4(PC)
SUBVU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+40(FP)
RET
// In parent, return.
BEQ R2, 3(PC)
MOVW R2, ret+40(FP)
RET
// Initialise m, g.
MOVV R17, g
MOVV R16, g_m(g)
// Call fn.
CALL (R18)
// fn should never return.
MOVV $2, R8 // crash if reached
MOVV R8, (R8)
RET
TEXT runtime·sigaltstack(SB),NOSPLIT,$0
MOVV new+0(FP), R4 // arg 1 - new sigaltstack
MOVV old+8(FP), R5 // arg 2 - old sigaltstack
MOVV $288, R2 // sys_sigaltstack
SYSCALL
BEQ R7, 3(PC)
MOVV $0, R8 // crash on syscall failure
MOVV R8, (R8)
RET
TEXT runtime·osyield(SB),NOSPLIT,$0
MOVV $298, R2 // sys_sched_yield
SYSCALL
RET
TEXT runtime·thrsleep(SB),NOSPLIT,$0
MOVV ident+0(FP), R4 // arg 1 - ident
MOVW clock_id+8(FP), R5 // arg 2 - clock_id
MOVV tsp+16(FP), R6 // arg 3 - tsp
MOVV lock+24(FP), R7 // arg 4 - lock
MOVV abort+32(FP), R8 // arg 5 - abort
MOVV $94, R2 // sys___thrsleep
SYSCALL
MOVW R2, ret+40(FP)
RET
TEXT runtime·thrwakeup(SB),NOSPLIT,$0
MOVV ident+0(FP), R4 // arg 1 - ident
MOVW n+8(FP), R5 // arg 2 - n
MOVV $301, R2 // sys___thrwakeup
SYSCALL
MOVW R2, ret+16(FP)
RET
TEXT runtime·sysctl(SB),NOSPLIT,$0
MOVV mib+0(FP), R4 // arg 1 - mib
MOVW miblen+8(FP), R5 // arg 2 - miblen
MOVV out+16(FP), R6 // arg 3 - out
MOVV size+24(FP), R7 // arg 4 - size
MOVV dst+32(FP), R8 // arg 5 - dest
MOVV ndst+40(FP), R9 // arg 6 - newlen
MOVV $202, R2 // sys___sysctl
SYSCALL
BEQ R7, 2(PC)
SUBVU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+48(FP)
RET
// int32 runtime·kqueue(void);
TEXT runtime·kqueue(SB),NOSPLIT,$0
MOVV $269, R2 // sys_kqueue
SYSCALL
BEQ R7, 2(PC)
SUBVU R2, R0, R2 // caller expects negative errno
MOVW R2, 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), R4 // arg 1 - kq
MOVV ch+8(FP), R5 // arg 2 - changelist
MOVW nch+16(FP), R6 // arg 3 - nchanges
MOVV ev+24(FP), R7 // arg 4 - eventlist
MOVW nev+32(FP), R8 // arg 5 - nevents
MOVV ts+40(FP), R9 // arg 6 - timeout
MOVV $72, R2 // sys_kevent
SYSCALL
BEQ R7, 2(PC)
SUBVU R2, R0, R2 // caller expects negative errno
MOVW R2, ret+48(FP)
RET
// func closeonexec(fd int32)
TEXT runtime·closeonexec(SB),NOSPLIT,$0
MOVW fd+0(FP), R4 // arg 1 - fd
MOVV $2, R5 // arg 2 - cmd (F_SETFD)
MOVV $1, R6 // arg 3 - arg (FD_CLOEXEC)
MOVV $92, R2 // sys_fcntl
SYSCALL
RET
// func runtime·setNonblock(int32 fd)
TEXT runtime·setNonblock(SB),NOSPLIT|NOFRAME,$0-4
MOVW fd+0(FP), R4 // arg 1 - fd
MOVV $3, R5 // arg 2 - cmd (F_GETFL)
MOVV $0, R6 // arg 3
MOVV $92, R2 // sys_fcntl
SYSCALL
MOVV $4, R6 // O_NONBLOCK
OR R2, R6 // arg 3 - flags
MOVW fd+0(FP), R4 // arg 1 - fd
MOVV $4, R5 // arg 2 - cmd (F_SETFL)
MOVV $92, R2 // sys_fcntl
SYSCALL
RET
Zerion Mini Shell 1.0