--- /dev/null
+// Copyright 2022 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 loong64, Linux
+//
+
+#include "go_asm.h"
+#include "go_tls.h"
+#include "textflag.h"
+
+#define AT_FDCWD -100
+
+#define SYS_exit 93
+#define SYS_read 63
+#define SYS_write 64
+#define SYS_close 57
+#define SYS_getpid 172
+#define SYS_kill 129
+#define SYS_fcntl 25
+#define SYS_mmap 222
+#define SYS_munmap 215
+#define SYS_setitimer 103
+#define SYS_clone 220
+#define SYS_nanosleep 101
+#define SYS_sched_yield 124
+#define SYS_rt_sigreturn 139
+#define SYS_rt_sigaction 134
+#define SYS_rt_sigprocmask 135
+#define SYS_sigaltstack 132
+#define SYS_madvise 233
+#define SYS_mincore 232
+#define SYS_gettid 178
+#define SYS_futex 98
+#define SYS_sched_getaffinity 123
+#define SYS_exit_group 94
+#define SYS_epoll_ctl 21
+#define SYS_tgkill 131
+#define SYS_openat 56
+#define SYS_epoll_pwait 22
+#define SYS_clock_gettime 113
+#define SYS_epoll_create1 20
+#define SYS_brk 214
+#define SYS_pipe2 59
+#define SYS_timer_create 107
+#define SYS_timer_settime 110
+#define SYS_timer_delete 111
+
+TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
+ MOVW code+0(FP), R4
+ MOVV $SYS_exit_group, R11
+ SYSCALL
+ RET
+
+// func exitThread(wait *uint32)
+TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8
+ MOVV wait+0(FP), R19
+ // We're done using the stack.
+ MOVW $0, R11
+ DBAR
+ MOVW R11, (R19)
+ DBAR
+ MOVW $0, R4 // exit code
+ MOVV $SYS_exit, R11
+ SYSCALL
+ JMP 0(PC)
+
+TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
+ MOVW $AT_FDCWD, R4 // AT_FDCWD, so this acts like open
+ MOVV name+0(FP), R5
+ MOVW mode+8(FP), R6
+ MOVW perm+12(FP), R7
+ MOVV $SYS_openat, R11
+ SYSCALL
+ MOVW $-4096, R5
+ BGEU R5, R4, 2(PC)
+ MOVW $-1, R4
+ MOVW R4, ret+16(FP)
+ RET
+
+TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
+ MOVW fd+0(FP), R4
+ MOVV $SYS_close, R11
+ SYSCALL
+ MOVW $-4096, R5
+ BGEU R5, R4, 2(PC)
+ MOVW $-1, R4
+ MOVW R4, ret+8(FP)
+ RET
+
+TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0-28
+ MOVV fd+0(FP), R4
+ MOVV p+8(FP), R5
+ MOVW n+16(FP), R6
+ MOVV $SYS_write, R11
+ SYSCALL
+ MOVW R4, ret+24(FP)
+ RET
+
+TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
+ MOVW fd+0(FP), R4
+ MOVV p+8(FP), R5
+ MOVW n+16(FP), R6
+ MOVV $SYS_read, R11
+ SYSCALL
+ MOVW R4, ret+24(FP)
+ RET
+
+// func pipe() (r, w int32, errno int32)
+TEXT runtime·pipe(SB),NOSPLIT|NOFRAME,$0-12
+ MOVV $r+0(FP), R4
+ MOVV R0, R5
+ MOVV $SYS_pipe2, R11
+ SYSCALL
+ MOVW R4, 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 $SYS_pipe2, R11
+ SYSCALL
+ MOVW R4, errno+16(FP)
+ RET
+
+TEXT runtime·usleep(SB),NOSPLIT,$16-4
+ MOVWU usec+0(FP), R6
+ MOVV R6, R5
+ MOVW $1000000, R4
+ DIVVU R4, R6, R6
+ MOVV R6, 8(R3)
+ MOVW $1000, R4
+ MULVU R6, R4, R4
+ SUBVU R4, R5
+ MOVV R5, 16(R3)
+
+ // nanosleep(&ts, 0)
+ ADDV $8, R3, R4
+ MOVW $0, R5
+ MOVV $SYS_nanosleep, R11
+ SYSCALL
+ RET
+
+TEXT runtime·gettid(SB),NOSPLIT,$0-4
+ MOVV $SYS_gettid, R11
+ SYSCALL
+ MOVW R4, ret+0(FP)
+ RET
+
+TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
+ MOVV $SYS_getpid, R11
+ SYSCALL
+ MOVW R4, R23
+ MOVV $SYS_gettid, R11
+ SYSCALL
+ MOVW R4, R5 // arg 2 tid
+ MOVW R23, R4 // arg 1 pid
+ MOVW sig+0(FP), R6 // arg 3
+ MOVV $SYS_tgkill, R11
+ SYSCALL
+ RET
+
+TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
+ MOVV $SYS_getpid, R11
+ SYSCALL
+ //MOVW R4, R4 // arg 1 pid
+ MOVW sig+0(FP), R5 // arg 2
+ MOVV $SYS_kill, R11
+ SYSCALL
+ RET
+
+TEXT ·getpid(SB),NOSPLIT|NOFRAME,$0-8
+ MOVV $SYS_getpid, R11
+ SYSCALL
+ MOVV R4, ret+0(FP)
+ RET
+
+TEXT ·tgkill(SB),NOSPLIT|NOFRAME,$0-24
+ MOVV tgid+0(FP), R4
+ MOVV tid+8(FP), R5
+ MOVV sig+16(FP), R6
+ MOVV $SYS_tgkill, R11
+ SYSCALL
+ RET
+
+TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
+ MOVW mode+0(FP), R4
+ MOVV new+8(FP), R5
+ MOVV old+16(FP), R6
+ MOVV $SYS_setitimer, R11
+ SYSCALL
+ RET
+
+TEXT runtime·timer_create(SB),NOSPLIT,$0-28
+ MOVW clockid+0(FP), R4
+ MOVV sevp+8(FP), R5
+ MOVV timerid+16(FP), R6
+ MOVV $SYS_timer_create, R11
+ SYSCALL
+ MOVW R4, ret+24(FP)
+ RET
+
+TEXT runtime·timer_settime(SB),NOSPLIT,$0-28
+ MOVW timerid+0(FP), R4
+ MOVW flags+4(FP), R5
+ MOVV new+8(FP), R6
+ MOVV old+16(FP), R7
+ MOVV $SYS_timer_settime, R11
+ SYSCALL
+ MOVW R4, ret+24(FP)
+ RET
+
+TEXT runtime·timer_delete(SB),NOSPLIT,$0-12
+ MOVW timerid+0(FP), R4
+ MOVV $SYS_timer_delete, R11
+ SYSCALL
+ MOVW R4, ret+8(FP)
+ RET
+
+TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
+ MOVV addr+0(FP), R4
+ MOVV n+8(FP), R5
+ MOVV dst+16(FP), R6
+ MOVV $SYS_mincore, R11
+ SYSCALL
+ MOVW R4, ret+24(FP)
+ RET
+
+// func walltime() (sec int64, nsec int32)
+TEXT runtime·walltime(SB),NOSPLIT,$16-12
+ MOVV R3, R23 // R23 is unchanged by C code
+ MOVV R3, R25
+
+ MOVV g_m(g), R24 // R24 = m
+
+ // Set vdsoPC and vdsoSP for SIGPROF traceback.
+ // Save the old values on stack and restore them on exit,
+ // so this function is reentrant.
+ MOVV m_vdsoPC(R24), R11
+ MOVV m_vdsoSP(R24), R7
+ MOVV R11, 8(R3)
+ MOVV R7, 16(R3)
+
+ MOVV $ret-8(FP), R11 // caller's SP
+ MOVV R1, m_vdsoPC(R24)
+ MOVV R11, m_vdsoSP(R24)
+
+ MOVV m_curg(R24), R4
+ MOVV g, R5
+ BNE R4, R5, noswitch
+
+ MOVV m_g0(R24), R4
+ MOVV (g_sched+gobuf_sp)(R4), R25 // Set SP to g0 stack
+
+noswitch:
+ SUBV $16, R25
+ AND $~15, R25 // Align for C code
+ MOVV R25, R3
+
+ MOVW $0, R4 // CLOCK_REALTIME=0
+ MOVV $0(R3), R5
+
+ MOVV runtime·vdsoClockgettimeSym(SB), R20
+ BEQ R20, fallback
+
+ JAL (R20)
+
+finish:
+ MOVV 0(R3), R7 // sec
+ MOVV 8(R3), R5 // nsec
+
+ MOVV R23, R3 // restore SP
+ // Restore vdsoPC, vdsoSP
+ // We don't worry about being signaled between the two stores.
+ // If we are not in a signal handler, we'll restore vdsoSP to 0,
+ // and no one will care about vdsoPC. If we are in a signal handler,
+ // we cannot receive another signal.
+ MOVV 16(R3), R25
+ MOVV R25, m_vdsoSP(R24)
+ MOVV 8(R3), R25
+ MOVV R25, m_vdsoPC(R24)
+
+ MOVV R7, sec+0(FP)
+ MOVW R5, nsec+8(FP)
+ RET
+
+fallback:
+ MOVV $SYS_clock_gettime, R11
+ SYSCALL
+ JMP finish
+
+TEXT runtime·nanotime1(SB),NOSPLIT,$16-8
+ MOVV R3, R23 // R23 is unchanged by C code
+ MOVV R3, R25
+
+ MOVV g_m(g), R24 // R24 = m
+
+ // Set vdsoPC and vdsoSP for SIGPROF traceback.
+ // Save the old values on stack and restore them on exit,
+ // so this function is reentrant.
+ MOVV m_vdsoPC(R24), R11
+ MOVV m_vdsoSP(R24), R7
+ MOVV R11, 8(R3)
+ MOVV R7, 16(R3)
+
+ MOVV $ret-8(FP), R11 // caller's SP
+ MOVV R1, m_vdsoPC(R24)
+ MOVV R11, m_vdsoSP(R24)
+
+ MOVV m_curg(R24), R4
+ MOVV g, R5
+ BNE R4, R5, noswitch
+
+ MOVV m_g0(R24), R4
+ MOVV (g_sched+gobuf_sp)(R4), R25 // Set SP to g0 stack
+
+noswitch:
+ SUBV $16, R25
+ AND $~15, R25 // Align for C code
+ MOVV R25, R3
+
+ MOVW $1, R4 // CLOCK_MONOTONIC=1
+ MOVV $0(R3), R5
+
+ MOVV runtime·vdsoClockgettimeSym(SB), R20
+ BEQ R20, fallback
+
+ JAL (R20)
+
+finish:
+ MOVV 0(R3), R7 // sec
+ MOVV 8(R3), R5 // nsec
+
+ MOVV R23, R3 // restore SP
+ // Restore vdsoPC, vdsoSP
+ // We don't worry about being signaled between the two stores.
+ // If we are not in a signal handler, we'll restore vdsoSP to 0,
+ // and no one will care about vdsoPC. If we are in a signal handler,
+ // we cannot receive another signal.
+ MOVV 16(R3), R25
+ MOVV R25, m_vdsoSP(R24)
+ MOVV 8(R3), R25
+ MOVV R25, m_vdsoPC(R24)
+
+ // sec is in R7, nsec in R5
+ // return nsec in R7
+ MOVV $1000000000, R4
+ MULVU R4, R7, R7
+ ADDVU R5, R7
+ MOVV R7, ret+0(FP)
+ RET
+
+fallback:
+ MOVV $SYS_clock_gettime, R11
+ SYSCALL
+ JMP finish
+
+TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
+ MOVW how+0(FP), R4
+ MOVV new+8(FP), R5
+ MOVV old+16(FP), R6
+ MOVW size+24(FP), R7
+ MOVV $SYS_rt_sigprocmask, R11
+ SYSCALL
+ MOVW $-4096, R5
+ BGEU R5, R4, 2(PC)
+ MOVV R0, 0xf1(R0) // crash
+ RET
+
+TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
+ MOVV sig+0(FP), R4
+ MOVV new+8(FP), R5
+ MOVV old+16(FP), R6
+ MOVV size+24(FP), R7
+ MOVV $SYS_rt_sigaction, R11
+ SYSCALL
+ MOVW R4, ret+32(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), R20
+ JAL (R20)
+ RET
+
+TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$64
+ // this might be called in external code context,
+ // where g is not set.
+ MOVB runtime·iscgo(SB), R19
+ BEQ R19, 2(PC)
+ JAL runtime·load_g(SB)
+
+ MOVW R4, 8(R3)
+ MOVV R5, 16(R3)
+ MOVV R6, 24(R3)
+ MOVV $runtime·sigtrampgo(SB), R19
+ JAL (R19)
+ RET
+
+TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
+ JMP runtime·sigtramp(SB)
+
+TEXT runtime·mmap(SB),NOSPLIT|NOFRAME,$0
+ MOVV addr+0(FP), R4
+ MOVV n+8(FP), R5
+ MOVW prot+16(FP), R6
+ MOVW flags+20(FP), R7
+ MOVW fd+24(FP), R8
+ MOVW off+28(FP), R9
+
+ MOVV $SYS_mmap, R11
+ SYSCALL
+ MOVW $-4096, R5
+ BGEU R5, R4, ok
+ MOVV $0, p+32(FP)
+ SUBVU R4, R0, R4
+ MOVV R4, err+40(FP)
+ RET
+ok:
+ MOVV R4, p+32(FP)
+ MOVV $0, err+40(FP)
+ RET
+
+TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
+ MOVV addr+0(FP), R4
+ MOVV n+8(FP), R5
+ MOVV $SYS_munmap, R11
+ SYSCALL
+ MOVW $-4096, R5
+ BGEU R5, R4, 2(PC)
+ MOVV R0, 0xf3(R0) // crash
+ RET
+
+TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
+ MOVV addr+0(FP), R4
+ MOVV n+8(FP), R5
+ MOVW flags+16(FP), R6
+ MOVV $SYS_madvise, R11
+ SYSCALL
+ MOVW R4, ret+24(FP)
+ RET
+
+// int64 futex(int32 *uaddr, int32 op, int32 val,
+// struct timespec *timeout, int32 *uaddr2, int32 val2);
+TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0
+ MOVV addr+0(FP), R4
+ MOVW op+8(FP), R5
+ MOVW val+12(FP), R6
+ MOVV ts+16(FP), R7
+ MOVV addr2+24(FP), R8
+ MOVW val3+32(FP), R9
+ MOVV $SYS_futex, R11
+ SYSCALL
+ MOVW R4, ret+40(FP)
+ RET
+
+// int64 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
+TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0
+ MOVW flags+0(FP), R4
+ MOVV stk+8(FP), R5
+
+ // Copy mp, gp, fn off parent stack for use by child.
+ // Careful: Linux system call clobbers ???.
+ MOVV mp+16(FP), R23
+ MOVV gp+24(FP), R24
+ MOVV fn+32(FP), R25
+
+ MOVV R23, -8(R5)
+ MOVV R24, -16(R5)
+ MOVV R25, -24(R5)
+ MOVV $1234, R23
+ MOVV R23, -32(R5)
+
+ MOVV $SYS_clone, R11
+ SYSCALL
+
+ // In parent, return.
+ BEQ R4, 3(PC)
+ MOVW R4, ret+40(FP)
+ RET
+
+ // In child, on new stack.
+ MOVV -32(R3), R23
+ MOVV $1234, R19
+ BEQ R23, R19, 2(PC)
+ MOVV R0, 0(R0)
+
+ // Initialize m->procid to Linux tid
+ MOVV $SYS_gettid, R11
+ SYSCALL
+
+ MOVV -24(R3), R25 // fn
+ MOVV -16(R3), R24 // g
+ MOVV -8(R3), R23 // m
+
+ BEQ R23, nog
+ BEQ R24, nog
+
+ MOVV R4, m_procid(R23)
+
+ // TODO: setup TLS.
+
+ // In child, set up new stack
+ MOVV R23, g_m(R24)
+ MOVV R24, g
+ //CALL runtime·stackcheck(SB)
+
+nog:
+ // Call fn
+ JAL (R25)
+
+ // It shouldn't return. If it does, exit that thread.
+ MOVW $111, R4
+ MOVV $SYS_exit, R11
+ SYSCALL
+ JMP -3(PC) // keep exiting
+
+TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
+ MOVV new+0(FP), R4
+ MOVV old+8(FP), R5
+ MOVV $SYS_sigaltstack, R11
+ SYSCALL
+ MOVW $-4096, R5
+ BGEU R5, R4, 2(PC)
+ MOVV R0, 0xf1(R0) // crash
+ RET
+
+TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
+ MOVV $SYS_sched_yield, R11
+ SYSCALL
+ RET
+
+TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
+ MOVV pid+0(FP), R4
+ MOVV len+8(FP), R5
+ MOVV buf+16(FP), R6
+ MOVV $SYS_sched_getaffinity, R11
+ SYSCALL
+ MOVW R4, ret+24(FP)
+ RET
+
+// int32 runtime·epollcreate(int32 size);
+TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
+ MOVW size+0(FP), R4
+ MOVV $SYS_epoll_create1, R11
+ SYSCALL
+ MOVW R4, ret+8(FP)
+ RET
+
+// int32 runtime·epollcreate1(int32 flags);
+TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
+ MOVW flags+0(FP), R4
+ MOVV $SYS_epoll_create1, R11
+ SYSCALL
+ MOVW R4, ret+8(FP)
+ RET
+
+// func epollctl(epfd, op, fd int32, ev *epollEvent) int
+TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
+ MOVW epfd+0(FP), R4
+ MOVW op+4(FP), R5
+ MOVW fd+8(FP), R6
+ MOVV ev+16(FP), R7
+ MOVV $SYS_epoll_ctl, R11
+ SYSCALL
+ MOVW R4, ret+24(FP)
+ RET
+
+// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
+TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
+ MOVW epfd+0(FP), R4
+ MOVV ev+8(FP), R5
+ MOVW nev+16(FP), R6
+ MOVW timeout+20(FP), R7
+ MOVV $0, R8
+ MOVV $SYS_epoll_pwait, R11
+ SYSCALL
+ MOVW R4, ret+24(FP)
+ RET
+
+// void runtime·closeonexec(int32 fd);
+TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
+ MOVW fd+0(FP), R4 // fd
+ MOVV $2, R5 // F_SETFD
+ MOVV $1, R6 // FD_CLOEXEC
+ MOVV $SYS_fcntl, R11
+ SYSCALL
+ RET
+
+// func runtime·setNonblock(int32 fd)
+TEXT runtime·setNonblock(SB),NOSPLIT|NOFRAME,$0-4
+ MOVW fd+0(FP), R4 // fd
+ MOVV $3, R5 // F_GETFL
+ MOVV $0, R6
+ MOVV $SYS_fcntl, R11
+ SYSCALL
+ MOVW $0x800, R6 // O_NONBLOCK
+ OR R4, R6
+ MOVW fd+0(FP), R4 // fd
+ MOVV $4, R5 // F_SETFL
+ MOVV $SYS_fcntl, R11
+ SYSCALL
+ RET
+
+// func sbrk0() uintptr
+TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0-8
+ // Implemented as brk(NULL).
+ MOVV $0, R4
+ MOVV $SYS_brk, R11
+ SYSCALL
+ MOVV R4, ret+0(FP)
+ RET
+
+TEXT runtime·access(SB),$0-20
+ MOVV R0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
+ MOVW R0, ret+16(FP) // for vet
+ RET
+
+TEXT runtime·connect(SB),$0-28
+ MOVV R0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
+ MOVW R0, ret+24(FP) // for vet
+ RET
+
+TEXT runtime·socket(SB),$0-20
+ MOVV R0, 2(R0) // unimplemented, only needed for android; declared in stubs_linux.go
+ MOVW R0, ret+16(FP) // for vet
+ RET