1 files changed, 83 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/kvx/crt1.S b/libc/sysdeps/linux/kvx/crt1.S
new file mode 100644
index 000000000..34501103e
--- /dev/null
+++ b/libc/sysdeps/linux/kvx/crt1.S
@@ -0,0 +1,83 @@
+/*
+ * This file is subject to the terms and conditions of the LGPL V2.1
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2018 Kalray Inc.
+ */
+
+/* Startup code compliant to the ELF KVX ABI */
+
+#include <libc-symbols.h>
+#include <features.h>
+
+.type	    main,@function
+.type	    __uClibc_main,@function
+	
+/*
+ * When we enter this piece of code, the program stack has been
+ * layed out by the kernel like this:
+ *        argc            argument counter (integer)
+ *        argv[0]         program name (pointer)
+ *        argv[1...N]     program args (pointers)
+ *        argv[argc-1]    end of args (integer)
+ *        NULL
+ *        env[0...N]      environment variables (pointers)
+ *        NULL
+ * 
+ *  Moreover, when using dynamic loader, $r0 contains the rtld_fini
+ *  address
+ *
+ * And we need to call the following function:
+ *  __uClibc_main (int (*main) (int, char **, char **), int argc,
+ *		char **argv, void (*init) (void), void (*fini) (void),
+ *		void (*rtld_fini) (void), void *stack_end)
+ */
+.text
+.globl	_start
+.type	_start,@function
+.align 	8
+C_SYMBOL_NAME(_start):
+	/* Load argc from stack */
+	ld $r1 = 0[$sp]
+	/* Load argv addr from stack */
+	addd $r2 = $sp, 0x8
+#ifdef __PIC__
+	pcrel $r7 = @gotaddr()
+#endif
+	;;
+	/* $r0 contains rtld_fini when run by dynamic loader */
+	copyd $r5 = $r0
+	/* prepare __uClibc_main arg */
+#ifndef __PIC__
+	make $r3 = _init
+	make $r4 = _fini
+#endif
+	;;
+	/* Align stack to 32-byte boundary */
+	andd $sp = $sp, -32
+	make $r8 = 0
+	make $fp = 0
+	/* prepare __uClibc_main arg */
+#ifdef __PIC__
+	ld $r3 = @got(_init)[$r7]
+#endif
+	;;
+	/* Setup stack_end for __uClibc_main */
+	copyd $r6 = $sp
+	/* Clear compute status */
+	set $cs = $r8
+#ifdef __PIC__
+	ld $r4 = @got(_fini)[$r7]
+#endif
+	;;
+#ifdef __PIC__
+	ld $r0 = @got(main)[$r7]
+#else
+	make $r0 = main
+#endif
+	goto __uClibc_main
+	;;
+	/* We should never return ! */
+	errop
+	;;