20000317 sourceware import

1 files changed, 49 insertions, 0 deletions

diff --git a/libgloss/mcore/crt0.S b/libgloss/mcore/crt0.S
new file mode 100644
index 000000000..cea437019
--- /dev/null
+++ b/libgloss/mcore/crt0.S
@@ -0,0 +1,49 @@
+// MCore StartUp Code.
+
+	.import	main
+	.import	exit
+
+	.text
+	.export	_start
+_start:
+	.export	_mainCRTStartup
+_mainCRTStartup:
+	// Initialise the stack pointer
+	lrw	r1, _stack
+	mov	r0, r1
+
+	// Zero the .bss data space
+	lrw     r1, __bss_start__
+	lrw     r2, __bss_end__
+	movi	r3, 0
+.L0:	
+	st	r3, (r1, 0)
+	addi	r1, 4
+	cmphs	r1, r2
+	bf      .L0
+#ifdef __ELF__
+	// Call the global/static constructors
+	jbsr    _init
+
+	// Setup destructors to be called from exit,
+	// just in case main never returns...
+	lrw     r2, _fini
+	jbsr    atexit
+#endif
+	
+	// Initialise the parameters to main()
+	movi 	r2, 0	// argc 
+	movi	r3, 0	// argv
+	movi	r4, 0	// envp
+
+	// Call main
+	jbsr	main
+
+	// Call exit
+	movi	r2, 0
+	jbsr	exit
+
+	// We should never reach here.
+	bkpt
+
+