From ccd992355df7192993c666236047820244914598 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Tue, 16 Apr 2024 21:19:13 +0200
Subject: Adding upstream version 1.21.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/runtime/sys_linux_loong64.s | 630 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 630 insertions(+)
 create mode 100644 src/runtime/sys_linux_loong64.s

(limited to 'src/runtime/sys_linux_loong64.s')

diff --git a/src/runtime/sys_linux_loong64.s b/src/runtime/sys_linux_loong64.s
new file mode 100644
index 0000000..12e5455
--- /dev/null
+++ b/src/runtime/sys_linux_loong64.s
@@ -0,0 +1,630 @@
+// 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"
+#include "cgo/abi_loong64.h"
+
+#define AT_FDCWD	-100
+#define CLOCK_REALTIME	0
+#define CLOCK_MONOTONIC	1
+
+#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_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_tgkill		131
+#define SYS_openat		56
+#define SYS_clock_gettime	113
+#define SYS_brk			214
+#define SYS_pipe2		59
+#define SYS_timer_create	107
+#define SYS_timer_settime	110
+#define SYS_timer_delete	111
+
+// func exit(code int32)
+TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
+	MOVW	code+0(FP), R4
+	MOVV	$SYS_exit_group, R11
+	SYSCALL
+	RET
+
+// func exitThread(wait *atomic.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)
+
+// func open(name *byte, mode, perm int32) int32
+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
+
+// func closefd(fd int32) int32
+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
+
+// func write1(fd uintptr, p unsafe.Pointer, n int32) int32
+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
+
+// func read(fd int32, p unsafe.Pointer, n int32) int32
+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 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
+
+// func usleep(usec uint32)
+TEXT runtime·usleep(SB),NOSPLIT,$16-4
+	MOVWU	usec+0(FP), R7
+	MOVV	$1000, R6
+	MULVU	R6, R7, R7
+	MOVV	$1000000000, R6
+
+	DIVVU	R6, R7, R5	// ts->tv_sec
+	REMVU	R6, R7, R4	// ts->tv_nsec
+	MOVV	R5, 8(R3)
+	MOVV	R4, 16(R3)
+
+	// nanosleep(&ts, 0)
+	ADDV	$8, R3, R4
+	MOVV	R0, R5
+	MOVV	$SYS_nanosleep, R11
+	SYSCALL
+	RET
+
+// func gettid() uint32
+TEXT runtime·gettid(SB),NOSPLIT,$0-4
+	MOVV	$SYS_gettid, R11
+	SYSCALL
+	MOVW	R4, ret+0(FP)
+	RET
+
+// func raise(sig uint32)
+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
+
+// func raiseproc(sig uint32)
+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
+
+// func getpid() int
+TEXT ·getpid(SB),NOSPLIT|NOFRAME,$0-8
+	MOVV	$SYS_getpid, R11
+	SYSCALL
+	MOVV	R4, ret+0(FP)
+	RET
+
+// func tgkill(tgid, tid, sig int)
+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
+
+// func setitimer(mode int32, new, old *itimerval)
+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
+
+// func timer_create(clockid int32, sevp *sigevent, timerid *int32) int32
+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
+
+// func timer_settime(timerid int32, flags int32, new, old *itimerspec) int32
+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
+
+// func timer_delete(timerid int32) int32
+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
+
+// func mincore(addr unsafe.Pointer, n uintptr, dst *byte) int32
+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,$24-12
+	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	$CLOCK_REALTIME, R4
+	MOVV	$0(R3), R5
+
+	MOVV	runtime·vdsoClockgettimeSym(SB), R20
+	BEQ	R20, fallback
+
+	// Store g on gsignal's stack, see sys_linux_arm64.s for detail
+	MOVBU	runtime·iscgo(SB), R25
+	BNE	R25, nosaveg
+
+	MOVV	m_gsignal(R24), R25	// g.m.gsignal
+	BEQ	R25, nosaveg
+	BEQ	g, R25, nosaveg
+
+	MOVV	(g_stack+stack_lo)(R25), R25	// g.m.gsignal.stack.lo
+	MOVV	g, (R25)
+
+	JAL	(R20)
+
+	MOVV	R0, (R25)
+	JMP	finish
+
+nosaveg:
+	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
+
+// func nanotime1() int64
+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	$CLOCK_MONOTONIC, R4
+	MOVV	$0(R3), R5
+
+	MOVV	runtime·vdsoClockgettimeSym(SB), R20
+	BEQ	R20, fallback
+
+	// Store g on gsignal's stack, see sys_linux_arm64.s for detail
+	MOVBU	runtime·iscgo(SB), R25
+	BNE	R25, nosaveg
+
+	MOVV	m_gsignal(R24), R25	// g.m.gsignal
+	BEQ	R25, nosaveg
+	BEQ	g, R25, nosaveg
+
+	MOVV	(g_stack+stack_lo)(R25), R25	// g.m.gsignal.stack.lo
+	MOVV	g, (R25)
+
+	JAL	(R20)
+
+	MOVV	R0, (R25)
+	JMP	finish
+
+nosaveg:
+	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
+
+// func rtsigprocmask(how int32, new, old *sigset, size int32)
+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
+
+// func rt_sigaction(sig uintptr, new, old *sigactiont, size uintptr) int32
+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
+
+// func sigfwd(fn uintptr, sig uint32, info *siginfo, ctx unsafe.Pointer)
+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
+
+// func sigtramp(signo, ureg, ctxt unsafe.Pointer)
+TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$168
+	MOVW	R4, (1*8)(R3)
+	MOVV	R5, (2*8)(R3)
+	MOVV	R6, (3*8)(R3)
+
+	// Save callee-save registers in the case of signal forwarding.
+	// Please refer to https://golang.org/issue/31827 .
+	SAVE_R22_TO_R31((4*8))
+	SAVE_F24_TO_F31((14*8))
+
+	// this might be called in external code context,
+	// where g is not set.
+	MOVB	runtime·iscgo(SB), R4
+	BEQ	R4, 2(PC)
+	JAL	runtime·load_g(SB)
+
+	MOVV	$runtime·sigtrampgo(SB), R4
+	JAL	(R4)
+
+	// Restore callee-save registers.
+	RESTORE_R22_TO_R31((4*8))
+	RESTORE_F24_TO_F31((14*8))
+
+	RET
+
+// func cgoSigtramp()
+TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
+	JMP	runtime·sigtramp(SB)
+
+// func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (p unsafe.Pointer, err int)
+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
+
+// func munmap(addr unsafe.Pointer, n uintptr)
+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
+
+// func madvise(addr unsafe.Pointer, n uintptr, flags int32)
+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
+
+// func futex(addr unsafe.Pointer, op int32, val uint32, ts, addr2 unsafe.Pointer, val3 uint32) int32
+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
+
+// func sigaltstack(new, old *stackt)
+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
+
+// func osyield()
+TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
+	MOVV	$SYS_sched_yield, R11
+	SYSCALL
+	RET
+
+// func sched_getaffinity(pid, len uintptr, buf *uintptr) int32
+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
+
+// 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
-- 
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