Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/src/runtime/rt0_linux_arm.s b/src/runtime/rt0_linux_arm.s
new file mode 100644
index 0000000..8a5722f
--- /dev/null
+++ b/src/runtime/rt0_linux_arm.s
@@ -0,0 +1,33 @@
+// Copyright 2009 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.
+
+#include "textflag.h"
+
+TEXT _rt0_arm_linux(SB),NOSPLIT|NOFRAME,$0
+	MOVW	(R13), R0	// argc
+	MOVW	$4(R13), R1		// argv
+	MOVW	$_rt0_arm_linux1(SB), R4
+	B		(R4)
+
+// When building with -buildmode=c-shared, this symbol is called when the shared
+// library is loaded.
+TEXT _rt0_arm_linux_lib(SB),NOSPLIT,$0
+	B	_rt0_arm_lib(SB)
+
+TEXT _rt0_arm_linux1(SB),NOSPLIT|NOFRAME,$0
+	// We first need to detect the kernel ABI, and warn the user
+	// if the system only supports OABI.
+	// The strategy here is to call some EABI syscall to see if
+	// SIGILL is received.
+	// If you get a SIGILL here, you have the wrong kernel.
+
+	// Save argc and argv (syscall will clobber at least R0).
+	MOVM.DB.W [R0-R1], (R13)
+
+	// do an EABI syscall
+	MOVW	$20, R7 // sys_getpid
+	SWI	$0 // this will trigger SIGILL on OABI systems
+
+	MOVM.IA.W (R13), [R0-R1]
+	B	runtime·rt0_go(SB)