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34784e1c43
* m68k/Makefile.in: Don't force a frame pointer on the ISRs. * m68k/bdm-crt1.c (__start1): Don't set the VBR here. (hardeare_init_hook): Define weakly. Set VBR here, enable caching if supported.
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/* Initialization code for coldfire boards.
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*
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* Copyright (c) 2006 CodeSourcery Inc
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include <stdlib.h>
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extern const int __interrupt_vector[];
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extern void __reset (void);
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extern const char __data_load[] __attribute__ ((aligned (4)));
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extern char __data_start[] __attribute__ ((aligned (4)));
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extern char __bss_start[] __attribute__ ((aligned (4)));
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extern char __end[] __attribute__ ((aligned (4)));
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extern void software_init_hook (void) __attribute__ ((weak));
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extern void hardware_init_hook (void) __attribute__ ((weak));
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extern void __INIT_SECTION__ (void);
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extern void __FINI_SECTION__ (void);
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extern int main (int, char **, char **);
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/* This is called from a tiny assembly stub that just initializes the
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stack pointer. */
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void __start1 (void)
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{
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unsigned ix;
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if (hardware_init_hook)
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hardware_init_hook ();
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/* Initialize memory */
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if (__data_load != __data_start)
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memcpy (__data_start, __data_load, __bss_start - __data_start);
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memset (__bss_start, 0, __end - __bss_start);
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if (software_init_hook)
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software_init_hook ();
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__INIT_SECTION__ ();
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/* I'm not sure how useful it is to have a fini_section in an
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embedded system. */
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atexit (__FINI_SECTION__);
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ix = main (0, NULL, NULL);
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exit (ix);
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while (1)
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__reset ();
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}
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/* A default hardware init hook. */
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void __attribute__ ((weak)) hardware_init_hook (void)
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{
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/* Set the VBR. */
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__asm__ __volatile__ ("movec.l %0,%/vbr" :: "r" (__interrupt_vector));
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#ifndef __mcf_family_5213
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/* Flush & enable the caches */
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__asm__ __volatile__ ("movec.l %0,%/cacr" :: "r" ((1l << 31) | (1<<24)));
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#endif
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/* Should we drop into user mode here? */
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}
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