1 files changed, 89 insertions, 0 deletions
diff --git a/src/runtime/cgo/gcc_mips64x.S b/src/runtime/cgo/gcc_mips64x.S
new file mode 100644
index 0000000..1629e47
--- /dev/null
+++ b/src/runtime/cgo/gcc_mips64x.S
@@ -0,0 +1,89 @@
+// 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.
+
+//go:build mips64 || mips64le
+
+.file "gcc_mips64x.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 MIPS N64 ABI, where $16-$23, $28, $30, and $f24-$f31
+ * are callee-save, so they must be saved explicitly, along with $31 (LR).
+ */
+.globl crosscall1
+.set noat
+crosscall1:
+#ifndef __mips_soft_float
+	daddiu	$29, $29, -160
+#else
+	daddiu	$29, $29, -96 // For soft-float, no need to make room for FP registers
+#endif
+	sd	$31, 0($29)
+	sd	$16, 8($29)
+	sd	$17, 16($29)
+	sd	$18, 24($29)
+	sd	$19, 32($29)
+	sd	$20, 40($29)
+	sd	$21, 48($29)
+	sd	$22, 56($29)
+	sd	$23, 64($29)
+	sd	$28, 72($29)
+	sd	$30, 80($29)
+#ifndef __mips_soft_float
+	sdc1	$f24, 88($29)
+	sdc1	$f25, 96($29)
+	sdc1	$f26, 104($29)
+	sdc1	$f27, 112($29)
+	sdc1	$f28, 120($29)
+	sdc1	$f29, 128($29)
+	sdc1	$f30, 136($29)
+	sdc1	$f31, 144($29)
+#endif
+
+	// prepare SB register = pc & 0xffffffff00000000
+	bal	1f
+1:
+	dsrl	$28, $31, 32
+	dsll	$28, $28, 32
+
+	move	$20, $4 // save R4
+	move	$1, $6
+	jalr	$5	// call setg_gcc (clobbers R4)
+	jalr	$20	// call fn
+
+	ld	$16, 8($29)
+	ld	$17, 16($29)
+	ld	$18, 24($29)
+	ld	$19, 32($29)
+	ld	$20, 40($29)
+	ld	$21, 48($29)
+	ld	$22, 56($29)
+	ld	$23, 64($29)
+	ld	$28, 72($29)
+	ld	$30, 80($29)
+#ifndef __mips_soft_float
+	ldc1	$f24, 88($29)
+	ldc1	$f25, 96($29)
+	ldc1	$f26, 104($29)
+	ldc1	$f27, 112($29)
+	ldc1	$f28, 120($29)
+	ldc1	$f29, 128($29)
+	ldc1	$f30, 136($29)
+	ldc1	$f31, 144($29)
+#endif
+	ld	$31, 0($29)
+#ifndef __mips_soft_float
+	daddiu	$29, $29, 160
+#else
+	daddiu	$29, $29, 96
+#endif
+	jr	$31
+
+.set at
+
+#ifdef __ELF__
+.section .note.GNU-stack,"",%progbits
+#endif