newlib-cygwin/libgloss/msp430/crt_init.S

/* Copyright (c) 2012-2015 Red Hat Incorporated.
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

     Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.

     Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.

     The name of Red Hat Incorporated may not be used to endorse
     or promote products derived from this software without specific
     prior written permission.

   This software is provided by the copyright holders and contributors
   "AS IS" and any express or implied warranties, including, but not
   limited to, the implied warranties of merchantability and fitness for
   a particular purpose are disclaimed.  In no event shall Red Hat
   incorporated be liable for any direct, indirect, incidental, special,
   exemplary, or consequential damages (including, but not limited to,
   procurement of substitute goods or services; loss of use, data, or
   profits; or business interruption) however caused and on any theory of
   liability, whether in contract, strict liability, or tort (including
   negligence or otherwise) arising in any way out of the use of this
   software, even if advised of the possibility of such damage.  */

#include "memmodel.h"

;; This function is responsible for initializing the contents of the
;; .bss section.

START_CRT_FUNC 0100 init_bss

	mov_	#__bssstart, R12
	clr.w	R13
	mov_	#__bsssize, R14
#ifdef __MSP430X_LARGE__
	clr.w	R15		; We assume that __bsssize is never > 64K
#endif
	call_	#memset

END_CRT_FUNC	init_bss
libgloss: msp430: split up crt0.S source The build system compiles crt0.S many times to produce independent object files by defining different -DLxxx symbols for each. This complicates the build, and has led to some bugs in the source and build (see the previous cleanup commits in here). The crt_bss.S file has also been duplicated with crt0.S leading to confusion as to which one is the "real" one. The only reason to keep them in one file is to make management of the section numbers when calling START_CRT_FUNC a little easier, but that seems trivial to check with a quick grep across all the files. Considering how complicated the build is now, and the bugs we've had as a result, split the crt0.S file up into multiple source files so we don't have to compile it multiple times. This will also simplify merging it into the top-level Makefile. 2023-12-27 11:01:30 +08:00			`/* Copyright (c) 2012-2015 Red Hat Incorporated.`
			`All rights reserved.`

			`Redistribution and use in source and binary forms, with or without`
			`modification, are permitted provided that the following conditions`
			`are met:`

			`Redistributions of source code must retain the above copyright`
			`notice, this list of conditions and the following disclaimer.`

			`Redistributions in binary form must reproduce the above copyright`
			`notice, this list of conditions and the following disclaimer in the`
			`documentation and/or other materials provided with the distribution.`

			`The name of Red Hat Incorporated may not be used to endorse`
			`or promote products derived from this software without specific`
			`prior written permission.`

			`This software is provided by the copyright holders and contributors`
			`"AS IS" and any express or implied warranties, including, but not`
			`limited to, the implied warranties of merchantability and fitness for`
			`a particular purpose are disclaimed. In no event shall Red Hat`
			`incorporated be liable for any direct, indirect, incidental, special,`
			`exemplary, or consequential damages (including, but not limited to,`
			`procurement of substitute goods or services; loss of use, data, or`
			`profits; or business interruption) however caused and on any theory of`
			`liability, whether in contract, strict liability, or tort (including`
			`negligence or otherwise) arising in any way out of the use of this`
			`software, even if advised of the possibility of such damage. */`

			`#include "memmodel.h"`

			`;; This function is responsible for initializing the contents of the`
			`;; .bss section.`

			`START_CRT_FUNC 0100 init_bss`

			`mov_ #__bssstart, R12`
			`clr.w R13`
			`mov_ #__bsssize, R14`
			`#ifdef __MSP430X_LARGE__`
			`clr.w R15 ; We assume that __bsssize is never > 64K`
			`#endif`
			`call_ #memset`

			`END_CRT_FUNC init_bss`