From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001
From: James <>
Date: Wed, 4 Nov 2015 11:49:21 +0000
Subject: trunk-47381

---
 target/linux/adm8668/image/lzma-loader/src/stubs.c | 52 ++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 target/linux/adm8668/image/lzma-loader/src/stubs.c

(limited to 'target/linux/adm8668/image/lzma-loader/src/stubs.c')

diff --git a/target/linux/adm8668/image/lzma-loader/src/stubs.c b/target/linux/adm8668/image/lzma-loader/src/stubs.c
new file mode 100644
index 0000000..468e5a1
--- /dev/null
+++ b/target/linux/adm8668/image/lzma-loader/src/stubs.c
@@ -0,0 +1,52 @@
+#include <exports.h>
+
+#ifndef GCC_VERSION
+#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
+#endif /* GCC_VERSION */
+
+/*
+ * k0 ($26) holds the pointer to the global_data; t9 ($25) is a call-
+ * clobbered register that is also used to set gp ($26). Note that the
+ * jr instruction also executes the instruction immediately following
+ * it; however, GCC/mips generates an additional `nop' after each asm
+ * statement
+ */
+#define EXPORT_FUNC(x) \
+	asm volatile (			\
+"	.globl " #x "\n"		\
+#x ":\n"				\
+"	lw	$25, %0($26)\n"		\
+"	lw	$25, %1($25)\n"		\
+"	jr	$25\n"			\
+	: : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "t9");
+
+/* This function is necessary to prevent the compiler from
+ * generating prologue/epilogue, preparing stack frame etc.
+ * The stub functions are special, they do not use the stack
+ * frame passed to them, but pass it intact to the actual
+ * implementation. On the other hand, asm() statements with
+ * arguments can be used only inside the functions (gcc limitation)
+ */
+#if GCC_VERSION < 3004
+static
+#endif /* GCC_VERSION */
+void __attribute__((unused)) dummy(void)
+{
+#include <_exports.h>
+}
+
+#if 0
+extern unsigned long __bss_start, _end;
+
+void app_startup(char **argv)
+{
+	unsigned long * cp = &__bss_start;
+
+	/* Zero out BSS */
+	while (cp < &_end) {
+		*cp++ = 0;
+	}
+}
+#endif
+
+#undef EXPORT_FUNC
-- 
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