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diff --git a/src/runtime/cgo/gcc_riscv64.S b/src/runtime/cgo/gcc_riscv64.S
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+// 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.
+
+.file "gcc_riscv64.S"
+
+/*
+ * void crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
+ *
+ * Calling into the gc tool chain, where all registers are caller save.
+ * Called from standard RISCV ELF psABI, where x8-x9, x18-x27, f8-f9 and
+ * f18-f27 are callee-save, so they must be saved explicitly, along with
+ * x1 (LR).
+ */
+.globl crosscall1
+crosscall1:
+ sd x1, -200(sp)
+ addi sp, sp, -200
+ sd x8, 8(sp)
+ sd x9, 16(sp)
+ sd x18, 24(sp)
+ sd x19, 32(sp)
+ sd x20, 40(sp)
+ sd x21, 48(sp)
+ sd x22, 56(sp)
+ sd x23, 64(sp)
+ sd x24, 72(sp)
+ sd x25, 80(sp)
+ sd x26, 88(sp)
+ sd x27, 96(sp)
+ fsd f8, 104(sp)
+ fsd f9, 112(sp)
+ fsd f18, 120(sp)
+ fsd f19, 128(sp)
+ fsd f20, 136(sp)
+ fsd f21, 144(sp)
+ fsd f22, 152(sp)
+ fsd f23, 160(sp)
+ fsd f24, 168(sp)
+ fsd f25, 176(sp)
+ fsd f26, 184(sp)
+ fsd f27, 192(sp)
+
+ // a0 = *fn, a1 = *setg_gcc, a2 = *g
+ mv s1, a0
+ mv s0, a1
+ mv a0, a2
+ jalr ra, s0 // call setg_gcc (clobbers x30 aka g)
+ jalr ra, s1 // call fn
+
+ ld x1, 0(sp)
+ ld x8, 8(sp)
+ ld x9, 16(sp)
+ ld x18, 24(sp)
+ ld x19, 32(sp)
+ ld x20, 40(sp)
+ ld x21, 48(sp)
+ ld x22, 56(sp)
+ ld x23, 64(sp)
+ ld x24, 72(sp)
+ ld x25, 80(sp)
+ ld x26, 88(sp)
+ ld x27, 96(sp)
+ fld f8, 104(sp)
+ fld f9, 112(sp)
+ fld f18, 120(sp)
+ fld f19, 128(sp)
+ fld f20, 136(sp)
+ fld f21, 144(sp)
+ fld f22, 152(sp)
+ fld f23, 160(sp)
+ fld f24, 168(sp)
+ fld f25, 176(sp)
+ fld f26, 184(sp)
+ fld f27, 192(sp)
+ addi sp, sp, 200
+
+ jr ra
+
+#ifdef __ELF__
+.section .note.GNU-stack,"",%progbits
+#endif