runtime: add support for linux/riscv64

Based on riscv-go port.

Updates #27532

Change-Id: If522807a382130be3c8d40f4b4c1131d1de7c9e3
Reviewed-on: https://go-review.googlesource.com/c/go/+/204632
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

1 files changed, 85 insertions, 0 deletions

diff --git a/src/runtime/signal_riscv64.go b/src/runtime/signal_riscv64.go
new file mode 100644
index 0000000000..cd0c393886
--- /dev/null
+++ b/src/runtime/signal_riscv64.go
@@ -0,0 +1,85 @@
+// Copyright 2016 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.
+
+// +build linux,riscv64
+
+package runtime
+
+import (
+	"runtime/internal/sys"
+	"unsafe"
+)
+
+func dumpregs(c *sigctxt) {
+	print("ra  ", hex(c.ra()), "\t")
+	print("sp  ", hex(c.sp()), "\n")
+	print("gp  ", hex(c.gp()), "\t")
+	print("tp  ", hex(c.tp()), "\n")
+	print("t0  ", hex(c.t0()), "\t")
+	print("t1  ", hex(c.t1()), "\n")
+	print("t2  ", hex(c.t2()), "\t")
+	print("s0  ", hex(c.s0()), "\n")
+	print("s1  ", hex(c.s1()), "\t")
+	print("a0  ", hex(c.a0()), "\n")
+	print("a1  ", hex(c.a1()), "\t")
+	print("a2  ", hex(c.a2()), "\n")
+	print("a3  ", hex(c.a3()), "\t")
+	print("a4  ", hex(c.a4()), "\n")
+	print("a5  ", hex(c.a5()), "\t")
+	print("a6  ", hex(c.a6()), "\n")
+	print("a7  ", hex(c.a7()), "\t")
+	print("s2  ", hex(c.s2()), "\n")
+	print("s3  ", hex(c.s3()), "\t")
+	print("s4  ", hex(c.s4()), "\n")
+	print("s5  ", hex(c.s5()), "\t")
+	print("s6  ", hex(c.s6()), "\n")
+	print("s7  ", hex(c.s7()), "\t")
+	print("s8  ", hex(c.s8()), "\n")
+	print("s9  ", hex(c.s9()), "\t")
+	print("s10 ", hex(c.s10()), "\n")
+	print("s11 ", hex(c.s11()), "\t")
+	print("t3  ", hex(c.t3()), "\n")
+	print("t4  ", hex(c.t4()), "\t")
+	print("t5  ", hex(c.t5()), "\n")
+	print("t6  ", hex(c.t6()), "\t")
+	print("pc  ", hex(c.pc()), "\n")
+}
+
+//go:nosplit
+//go:nowritebarrierrec
+func (c *sigctxt) sigpc() uintptr { return uintptr(c.pc()) }
+
+func (c *sigctxt) sigsp() uintptr { return uintptr(c.sp()) }
+func (c *sigctxt) siglr() uintptr { return uintptr(c.ra()) }
+func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }
+
+// preparePanic sets up the stack to look like a call to sigpanic.
+func (c *sigctxt) preparePanic(sig uint32, gp *g) {
+	// We arrange RA, and pc to pretend the panicking
+	// function calls sigpanic directly.
+	// Always save RA to stack so that panics in leaf
+	// functions are correctly handled. This smashes
+	// the stack frame but we're not going back there
+	// anyway.
+	sp := c.sp() - sys.PtrSize
+	c.set_sp(sp)
+	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.ra()
+
+	pc := gp.sigpc
+
+	if shouldPushSigpanic(gp, pc, uintptr(c.ra())) {
+		// Make it look the like faulting PC called sigpanic.
+		c.set_ra(uint64(pc))
+	}
+
+	// In case we are panicking from external C code
+	c.set_gp(uint64(uintptr(unsafe.Pointer(gp))))
+	c.set_pc(uint64(funcPC(sigpanic)))
+}
+
+const pushCallSupported = false
+
+func (c *sigctxt) pushCall(targetPC uintptr) {
+	throw("unimplemented")
+}