1 files changed, 31 insertions, 0 deletions
diff --git a/src/runtime/cgo/gcc_arm.S b/src/runtime/cgo/gcc_arm.S
new file mode 100644
index 0000000..3df8143
--- /dev/null
+++ b/src/runtime/cgo/gcc_arm.S
@@ -0,0 +1,31 @@
+// Copyright 2012 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_arm.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 ARM EABI, where r4-r11 are callee-save, so they
+ * must be saved explicitly.
+ */
+.globl crosscall1
+crosscall1:
+	push {r4, r5, r6, r7, r8, r9, r10, r11, ip, lr}
+	mov r4, r0
+	mov r5, r1
+	mov r0, r2
+
+	// Because the assembler might target an earlier revision of the ISA
+	// by default, we encode BLX as a .word.
+	.word 0xe12fff35 // blx r5 // setg(g)
+	.word 0xe12fff34 // blx r4 // fn()
+
+	pop {r4, r5, r6, r7, r8, r9, r10, r11, ip, pc}
+
+
+#ifdef __ELF__
+.section .note.GNU-stack,"",%progbits
+#endif