1 files changed, 660 insertions, 0 deletions
diff --git a/src/runtime/sys_linux_riscv64.s b/src/runtime/sys_linux_riscv64.s
new file mode 100644
index 0000000..8b1b26b
--- /dev/null
+++ b/src/runtime/sys_linux_riscv64.s
@@ -0,0 +1,660 @@
+// Copyright 2015 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 riscv64, Linux
+//
+
+#include "textflag.h"
+#include "go_asm.h"
+
+#define AT_FDCWD -100
+#define CLOCK_REALTIME 0
+#define CLOCK_MONOTONIC 1
+
+#define SYS_brk			214
+#define SYS_clock_gettime	113
+#define SYS_clone		220
+#define SYS_close		57
+#define SYS_connect		203
+#define SYS_epoll_create1	20
+#define SYS_epoll_ctl		21
+#define SYS_epoll_pwait		22
+#define SYS_exit		93
+#define SYS_exit_group		94
+#define SYS_faccessat		48
+#define SYS_fcntl		25
+#define SYS_futex		98
+#define SYS_getpid		172
+#define SYS_gettid		178
+#define SYS_gettimeofday	169
+#define SYS_kill		129
+#define SYS_madvise		233
+#define SYS_mincore		232
+#define SYS_mmap		222
+#define SYS_munmap		215
+#define SYS_nanosleep		101
+#define SYS_openat		56
+#define SYS_pipe2		59
+#define SYS_pselect6		72
+#define SYS_read		63
+#define SYS_rt_sigaction	134
+#define SYS_rt_sigprocmask	135
+#define SYS_rt_sigreturn	139
+#define SYS_sched_getaffinity	123
+#define SYS_sched_yield		124
+#define SYS_setitimer		103
+#define SYS_sigaltstack		132
+#define SYS_socket		198
+#define SYS_tgkill		131
+#define SYS_timer_create	107
+#define SYS_timer_delete	111
+#define SYS_timer_settime	110
+#define SYS_tkill		130
+#define SYS_write		64
+
+// func exit(code int32)
+TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
+	MOVW	code+0(FP), A0
+	MOV	$SYS_exit_group, A7
+	ECALL
+	RET
+
+// func exitThread(wait *atomic.Uint32)
+TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8
+	MOV	wait+0(FP), A0
+	// We're done using the stack.
+	FENCE
+	MOVW	ZERO, (A0)
+	FENCE
+	MOV	$0, A0	// exit code
+	MOV	$SYS_exit, A7
+	ECALL
+	JMP	0(PC)
+
+// func open(name *byte, mode, perm int32) int32
+TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
+	MOV	$AT_FDCWD, A0
+	MOV	name+0(FP), A1
+	MOVW	mode+8(FP), A2
+	MOVW	perm+12(FP), A3
+	MOV	$SYS_openat, A7
+	ECALL
+	MOV	$-4096, T0
+	BGEU	T0, A0, 2(PC)
+	MOV	$-1, A0
+	MOVW	A0, ret+16(FP)
+	RET
+
+// func closefd(fd int32) int32
+TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
+	MOVW	fd+0(FP), A0
+	MOV	$SYS_close, A7
+	ECALL
+	MOV	$-4096, T0
+	BGEU	T0, A0, 2(PC)
+	MOV	$-1, A0
+	MOVW	A0, ret+8(FP)
+	RET
+
+// func write1(fd uintptr, p unsafe.Pointer, n int32) int32
+TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0-28
+	MOV	fd+0(FP), A0
+	MOV	p+8(FP), A1
+	MOVW	n+16(FP), A2
+	MOV	$SYS_write, A7
+	ECALL
+	MOVW	A0, 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), A0
+	MOV	p+8(FP), A1
+	MOVW	n+16(FP), A2
+	MOV	$SYS_read, A7
+	ECALL
+	MOVW	A0, ret+24(FP)
+	RET
+
+// func pipe() (r, w int32, errno int32)
+TEXT runtime·pipe(SB),NOSPLIT|NOFRAME,$0-12
+	MOV	$r+0(FP), A0
+	MOV	ZERO, A1
+	MOV	$SYS_pipe2, A7
+	ECALL
+	MOVW	A0, errno+8(FP)
+	RET
+
+// func pipe2(flags int32) (r, w int32, errno int32)
+TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
+	MOV	$r+8(FP), A0
+	MOVW	flags+0(FP), A1
+	MOV	$SYS_pipe2, A7
+	ECALL
+	MOVW	A0, errno+16(FP)
+	RET
+
+// func usleep(usec uint32)
+TEXT runtime·usleep(SB),NOSPLIT,$24-4
+	MOVWU	usec+0(FP), A0
+	MOV	$1000, A1
+	MUL	A1, A0, A0
+	MOV	$1000000000, A1
+	DIV	A1, A0, A2
+	MOV	A2, 8(X2)
+	REM	A1, A0, A3
+	MOV	A3, 16(X2)
+	ADD	$8, X2, A0
+	MOV	ZERO, A1
+	MOV	$SYS_nanosleep, A7
+	ECALL
+	RET
+
+// func gettid() uint32
+TEXT runtime·gettid(SB),NOSPLIT,$0-4
+	MOV	$SYS_gettid, A7
+	ECALL
+	MOVW	A0, ret+0(FP)
+	RET
+
+// func raise(sig uint32)
+TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
+	MOV	$SYS_gettid, A7
+	ECALL
+	// arg 1 tid - already in A0
+	MOVW	sig+0(FP), A1	// arg 2
+	MOV	$SYS_tkill, A7
+	ECALL
+	RET
+
+// func raiseproc(sig uint32)
+TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
+	MOV	$SYS_getpid, A7
+	ECALL
+	// arg 1 pid - already in A0
+	MOVW	sig+0(FP), A1	// arg 2
+	MOV	$SYS_kill, A7
+	ECALL
+	RET
+
+// func getpid() int
+TEXT ·getpid(SB),NOSPLIT|NOFRAME,$0-8
+	MOV	$SYS_getpid, A7
+	ECALL
+	MOV	A0, ret+0(FP)
+	RET
+
+// func tgkill(tgid, tid, sig int)
+TEXT ·tgkill(SB),NOSPLIT|NOFRAME,$0-24
+	MOV	tgid+0(FP), A0
+	MOV	tid+8(FP), A1
+	MOV	sig+16(FP), A2
+	MOV	$SYS_tgkill, A7
+	ECALL
+	RET
+
+// func setitimer(mode int32, new, old *itimerval)
+TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
+	MOVW	mode+0(FP), A0
+	MOV	new+8(FP), A1
+	MOV	old+16(FP), A2
+	MOV	$SYS_setitimer, A7
+	ECALL
+	RET
+
+// func timer_create(clockid int32, sevp *sigevent, timerid *int32) int32
+TEXT runtime·timer_create(SB),NOSPLIT,$0-28
+	MOVW	clockid+0(FP), A0
+	MOV	sevp+8(FP), A1
+	MOV	timerid+16(FP), A2
+	MOV	$SYS_timer_create, A7
+	ECALL
+	MOVW	A0, 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), A0
+	MOVW	flags+4(FP), A1
+	MOV	new+8(FP), A2
+	MOV	old+16(FP), A3
+	MOV	$SYS_timer_settime, A7
+	ECALL
+	MOVW	A0, ret+24(FP)
+	RET
+
+// func timer_delete(timerid int32) int32
+TEXT runtime·timer_delete(SB),NOSPLIT,$0-12
+	MOVW	timerid+0(FP), A0
+	MOV	$SYS_timer_delete, A7
+	ECALL
+	MOVW	A0, ret+8(FP)
+	RET
+
+// func mincore(addr unsafe.Pointer, n uintptr, dst *byte) int32
+TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
+	MOV	addr+0(FP), A0
+	MOV	n+8(FP), A1
+	MOV	dst+16(FP), A2
+	MOV	$SYS_mincore, A7
+	ECALL
+	MOVW	A0, ret+24(FP)
+	RET
+
+// func walltime() (sec int64, nsec int32)
+TEXT runtime·walltime(SB),NOSPLIT,$40-12
+	MOV	$CLOCK_REALTIME, A0
+
+	MOV	runtime·vdsoClockgettimeSym(SB), A7
+	BEQZ	A7, fallback
+	MOV	X2, S2 // S2,S3,S4 is unchanged by C code
+	MOV	g_m(g), S3 // S3 = m
+
+	// Save the old values on stack for reentrant
+	MOV	m_vdsoPC(S3), T0
+	MOV	T0, 24(X2)
+	MOV	m_vdsoSP(S3), T0
+	MOV	T0, 32(X2)
+
+	MOV	RA, m_vdsoPC(S3)
+	MOV	$ret-8(FP), T1 // caller's SP
+	MOV	T1, m_vdsoSP(S3)
+
+	MOV	m_curg(S3), T1
+	BNE	g, T1, noswitch
+
+	MOV	m_g0(S3), T1
+	MOV	(g_sched+gobuf_sp)(T1), X2
+
+noswitch:
+	ADDI	$-24, X2 // Space for result
+	ANDI	$~7, X2 // Align for C code
+	MOV	$8(X2), A1
+
+	// Store g on gsignal's stack, see sys_linux_arm64.s for detail
+	MOVBU	runtime·iscgo(SB), S4
+	BNEZ	S4, nosaveg
+	MOV	m_gsignal(S3), S4 // g.m.gsignal
+	BEQZ	S4, nosaveg
+	BEQ	g, S4, nosaveg
+	MOV	(g_stack+stack_lo)(S4), S4 // g.m.gsignal.stack.lo
+	MOV	g, (S4)
+
+	JALR	RA, A7
+
+	MOV	ZERO, (S4)
+	JMP	finish
+
+nosaveg:
+	JALR	RA, A7
+
+finish:
+	MOV	8(X2), T0	// sec
+	MOV	16(X2), T1	// nsec
+
+	MOV	S2, X2	// restore stack
+	MOV	24(X2), A2
+	MOV	A2, m_vdsoPC(S3)
+
+	MOV	32(X2), A3
+	MOV	A3, m_vdsoSP(S3)
+
+	MOV	T0, sec+0(FP)
+	MOVW	T1, nsec+8(FP)
+	RET
+
+fallback:
+	MOV	$8(X2), A1
+	MOV	$SYS_clock_gettime, A7
+	ECALL
+	MOV	8(X2), T0	// sec
+	MOV	16(X2), T1	// nsec
+	MOV	T0, sec+0(FP)
+	MOVW	T1, nsec+8(FP)
+	RET
+
+// func nanotime1() int64
+TEXT runtime·nanotime1(SB),NOSPLIT,$40-8
+	MOV	$CLOCK_MONOTONIC, A0
+
+	MOV	runtime·vdsoClockgettimeSym(SB), A7
+	BEQZ	A7, fallback
+
+	MOV	X2, S2 // S2 = RSP, S2 is unchanged by C code
+	MOV	g_m(g), S3 // S3 = m
+	// Save the old values on stack for reentrant
+	MOV	m_vdsoPC(S3), T0
+	MOV	T0, 24(X2)
+	MOV	m_vdsoSP(S3), T0
+	MOV	T0, 32(X2)
+
+	MOV	RA, m_vdsoPC(S3)
+	MOV	$ret-8(FP), T0 // caller's SP
+	MOV	T0, m_vdsoSP(S3)
+
+	MOV	m_curg(S3), T1
+	BNE	g, T1, noswitch
+
+	MOV	m_g0(S3), T1
+	MOV	(g_sched+gobuf_sp)(T1), X2
+
+noswitch:
+	ADDI	$-24, X2 // Space for result
+	ANDI	$~7, X2 // Align for C code
+	MOV	$8(X2), A1
+
+	// Store g on gsignal's stack, see sys_linux_arm64.s for detail
+	MOVBU	runtime·iscgo(SB), S4
+	BNEZ	S4, nosaveg
+	MOV	m_gsignal(S3), S4 // g.m.gsignal
+	BEQZ	S4, nosaveg
+	BEQ	g, S4, nosaveg
+	MOV	(g_stack+stack_lo)(S4), S4 // g.m.gsignal.stack.lo
+	MOV	g, (S4)
+
+	JALR	RA, A7
+
+	MOV	ZERO, (S4)
+	JMP	finish
+
+nosaveg:
+	JALR	RA, A7
+
+finish:
+	MOV	8(X2), T0	// sec
+	MOV	16(X2), T1	// nsec
+	// restore stack
+	MOV	S2, X2
+	MOV	24(X2), T2
+	MOV	T2, m_vdsoPC(S3)
+
+	MOV	32(X2), T2
+	MOV	T2, m_vdsoSP(S3)
+	// sec is in T0, nsec in T1
+	// return nsec in T0
+	MOV	$1000000000, T2
+	MUL	T2, T0
+	ADD	T1, T0
+	MOV	T0, ret+0(FP)
+	RET
+
+fallback:
+	MOV	$8(X2), A1
+	MOV	$SYS_clock_gettime, A7
+	ECALL
+	MOV	8(X2), T0	// sec
+	MOV	16(X2), T1	// nsec
+	MOV	$1000000000, T2
+	MUL	T2, T0
+	ADD	T1, T0
+	MOV	T0, ret+0(FP)
+	RET
+
+// func rtsigprocmask(how int32, new, old *sigset, size int32)
+TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
+	MOVW	how+0(FP), A0
+	MOV	new+8(FP), A1
+	MOV	old+16(FP), A2
+	MOVW	size+24(FP), A3
+	MOV	$SYS_rt_sigprocmask, A7
+	ECALL
+	MOV	$-4096, T0
+	BLTU	A0, T0, 2(PC)
+	WORD	$0	// crash
+	RET
+
+// func rt_sigaction(sig uintptr, new, old *sigactiont, size uintptr) int32
+TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
+	MOV	sig+0(FP), A0
+	MOV	new+8(FP), A1
+	MOV	old+16(FP), A2
+	MOV	size+24(FP), A3
+	MOV	$SYS_rt_sigaction, A7
+	ECALL
+	MOVW	A0, 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), A0
+	MOV	info+16(FP), A1
+	MOV	ctx+24(FP), A2
+	MOV	fn+0(FP), T1
+	JALR	RA, T1
+	RET
+
+// func sigtramp(signo, ureg, ctxt unsafe.Pointer)
+TEXT runtime·sigtramp(SB),NOSPLIT,$64
+	MOVW	A0, 8(X2)
+	MOV	A1, 16(X2)
+	MOV	A2, 24(X2)
+
+	// this might be called in external code context,
+	// where g is not set.
+	MOVBU	runtime·iscgo(SB), A0
+	BEQ	A0, ZERO, 2(PC)
+	CALL	runtime·load_g(SB)
+
+	MOV	$runtime·sigtrampgo(SB), A0
+	JALR	RA, A0
+	RET
+
+// func cgoSigtramp()
+TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0
+	MOV	$runtime·sigtramp(SB), T1
+	JALR	ZERO, T1
+
+// 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
+	MOV	addr+0(FP), A0
+	MOV	n+8(FP), A1
+	MOVW	prot+16(FP), A2
+	MOVW	flags+20(FP), A3
+	MOVW	fd+24(FP), A4
+	MOVW	off+28(FP), A5
+	MOV	$SYS_mmap, A7
+	ECALL
+	MOV	$-4096, T0
+	BGEU	T0, A0, 5(PC)
+	SUB	A0, ZERO, A0
+	MOV	ZERO, p+32(FP)
+	MOV	A0, err+40(FP)
+	RET
+ok:
+	MOV	A0, p+32(FP)
+	MOV	ZERO, err+40(FP)
+	RET
+
+// func munmap(addr unsafe.Pointer, n uintptr)
+TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
+	MOV	addr+0(FP), A0
+	MOV	n+8(FP), A1
+	MOV	$SYS_munmap, A7
+	ECALL
+	MOV	$-4096, T0
+	BLTU	A0, T0, 2(PC)
+	WORD	$0	// crash
+	RET
+
+// func madvise(addr unsafe.Pointer, n uintptr, flags int32)
+TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
+	MOV	addr+0(FP), A0
+	MOV	n+8(FP), A1
+	MOVW	flags+16(FP), A2
+	MOV	$SYS_madvise, A7
+	ECALL
+	MOVW	A0, 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
+	MOV	addr+0(FP), A0
+	MOVW	op+8(FP), A1
+	MOVW	val+12(FP), A2
+	MOV	ts+16(FP), A3
+	MOV	addr2+24(FP), A4
+	MOVW	val3+32(FP), A5
+	MOV	$SYS_futex, A7
+	ECALL
+	MOVW	A0, ret+40(FP)
+	RET
+
+// func clone(flags int32, stk, mp, gp, fn unsafe.Pointer) int32
+TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0
+	MOVW	flags+0(FP), A0
+	MOV	stk+8(FP), A1
+
+	// Copy mp, gp, fn off parent stack for use by child.
+	MOV	mp+16(FP), T0
+	MOV	gp+24(FP), T1
+	MOV	fn+32(FP), T2
+
+	MOV	T0, -8(A1)
+	MOV	T1, -16(A1)
+	MOV	T2, -24(A1)
+	MOV	$1234, T0
+	MOV	T0, -32(A1)
+
+	MOV	$SYS_clone, A7
+	ECALL
+
+	// In parent, return.
+	BEQ	ZERO, A0, child
+	MOVW	ZERO, ret+40(FP)
+	RET
+
+child:
+	// In child, on new stack.
+	MOV	-32(X2), T0
+	MOV	$1234, A0
+	BEQ	A0, T0, good
+	WORD	$0	// crash
+
+good:
+	// Initialize m->procid to Linux tid
+	MOV	$SYS_gettid, A7
+	ECALL
+
+	MOV	-24(X2), T2	// fn
+	MOV	-16(X2), T1	// g
+	MOV	-8(X2), T0	// m
+
+	BEQ	ZERO, T0, nog
+	BEQ	ZERO, T1, nog
+
+	MOV	A0, m_procid(T0)
+
+	// In child, set up new stack
+	MOV	T0, g_m(T1)
+	MOV	T1, g
+
+nog:
+	// Call fn
+	JALR	RA, T2
+
+	// It shouldn't return.  If it does, exit this thread.
+	MOV	$111, A0
+	MOV	$SYS_exit, A7
+	ECALL
+	JMP	-3(PC)	// keep exiting
+
+// func sigaltstack(new, old *stackt)
+TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
+	MOV	new+0(FP), A0
+	MOV	old+8(FP), A1
+	MOV	$SYS_sigaltstack, A7
+	ECALL
+	MOV	$-4096, T0
+	BLTU	A0, T0, 2(PC)
+	WORD	$0	// crash
+	RET
+
+// func osyield()
+TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
+	MOV	$SYS_sched_yield, A7
+	ECALL
+	RET
+
+// func sched_getaffinity(pid, len uintptr, buf *uintptr) int32
+TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
+	MOV	pid+0(FP), A0
+	MOV	len+8(FP), A1
+	MOV	buf+16(FP), A2
+	MOV	$SYS_sched_getaffinity, A7
+	ECALL
+	MOV	A0, ret+24(FP)
+	RET
+
+// func epollcreate(size int32) int32
+TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
+	MOV	$0, A0
+	MOV	$SYS_epoll_create1, A7
+	ECALL
+	MOVW	A0, ret+8(FP)
+	RET
+
+// func epollcreate1(flags int32) int32
+TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
+	MOVW	flags+0(FP), A0
+	MOV	$SYS_epoll_create1, A7
+	ECALL
+	MOVW	A0, ret+8(FP)
+	RET
+
+// func epollctl(epfd, op, fd int32, ev *epollevent) int32
+TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), A0
+	MOVW	op+4(FP), A1
+	MOVW	fd+8(FP), A2
+	MOV	ev+16(FP), A3
+	MOV	$SYS_epoll_ctl, A7
+	ECALL
+	MOVW	A0, ret+24(FP)
+	RET
+
+// func epollwait(epfd int32, ev *epollevent, nev, timeout int32) int32
+TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
+	MOVW	epfd+0(FP), A0
+	MOV	ev+8(FP), A1
+	MOVW	nev+16(FP), A2
+	MOVW	timeout+20(FP), A3
+	MOV	$0, A4
+	MOV	$SYS_epoll_pwait, A7
+	ECALL
+	MOVW	A0, ret+24(FP)
+	RET
+
+// func closeonexec(int32)
+TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
+	MOVW	fd+0(FP), A0  // fd
+	MOV	$2, A1	// F_SETFD
+	MOV	$1, A2	// FD_CLOEXEC
+	MOV	$SYS_fcntl, A7
+	ECALL
+	RET
+
+// func runtime·setNonblock(int32 fd)
+TEXT runtime·setNonblock(SB),NOSPLIT|NOFRAME,$0-4
+	MOVW	fd+0(FP), A0 // fd
+	MOV	$3, A1	// F_GETFL
+	MOV	$0, A2
+	MOV	$SYS_fcntl, A7
+	ECALL
+	MOV	$0x800, A2 // O_NONBLOCK
+	OR	A0, A2
+	MOVW	fd+0(FP), A0 // fd
+	MOV	$4, A1	// F_SETFL
+	MOV	$SYS_fcntl, A7
+	ECALL
+	RET
+
+// func sbrk0() uintptr
+TEXT runtime·sbrk0(SB),NOSPLIT,$0-8
+	// Implemented as brk(NULL).
+	MOV	$0, A0
+	MOV	$SYS_brk, A7
+	ECALL
+	MOVW	A0, ret+0(FP)
+	RET