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/*
* Ovlymgr.c -- Runtime Overlay Manager for the GDB testsuite.
*/
#include "ovlymgr.h"
#include <string.h>
#include <stdlib.h>
/* Local functions and data: */
extern unsigned long _ovly_table[][4];
extern unsigned long _novlys __attribute__ ((section (".data")));
enum ovly_index { VMA, SIZE, LMA, MAPPED};
static void ovly_copy (unsigned long dst, unsigned long src, long size);
/* Flush the data and instruction caches at address START for SIZE bytes.
Support for each new port must be added here. */
/* FIXME: Might be better to have a standard libgloss function that
ports provide that we can then use. Use libgloss instead of newlib
since libgloss is the one intended to handle low level system issues.
I would suggest something like _flush_cache to avoid the user's namespace
but not be completely obscure as other things may need this facility. */
static void
FlushCache (void)
{
#ifdef __M32R__
volatile char *mspr = (char *) 0xfffffff7;
*mspr = 1;
#endif
}
/* _ovly_debug_event:
* Debuggers may set a breakpoint here, to be notified
* when the overlay table has been modified.
*/
static void
_ovly_debug_event (void)
{
}
/* OverlayLoad:
* Copy the overlay into its runtime region,
* and mark the overlay as "mapped".
*/
bool
OverlayLoad (unsigned long ovlyno)
{
unsigned long i;
if (ovlyno < 0 || ovlyno >= _novlys)
exit (-1); /* fail, bad ovly number */
if (_ovly_table[ovlyno][MAPPED])
return TRUE; /* this overlay already mapped -- nothing to do! */
for (i = 0; i < _novlys; i++)
if (i == ovlyno)
_ovly_table[i][MAPPED] = 1; /* this one now mapped */
else if (_ovly_table[i][VMA] == _ovly_table[ovlyno][VMA])
_ovly_table[i][MAPPED] = 0; /* this one now un-mapped */
ovly_copy (_ovly_table[ovlyno][VMA],
_ovly_table[ovlyno][LMA],
_ovly_table[ovlyno][SIZE]);
FlushCache ();
_ovly_debug_event ();
return TRUE;
}
/* OverlayUnload:
* Copy the overlay back into its "load" region.
* Does NOT mark overlay as "unmapped", therefore may be called
* more than once for the same mapped overlay.
*/
bool
OverlayUnload (unsigned long ovlyno)
{
if (ovlyno < 0 || ovlyno >= _novlys)
exit (-1); /* fail, bad ovly number */
if (!_ovly_table[ovlyno][MAPPED])
exit (-1); /* error, can't copy out a segment that's not "in" */
ovly_copy (_ovly_table[ovlyno][LMA],
_ovly_table[ovlyno][VMA],
_ovly_table[ovlyno][SIZE]);
_ovly_debug_event ();
return TRUE;
}
static void
ovly_copy (unsigned long dst, unsigned long src, long size)
{
memcpy ((void *) dst, (void *) src, size);
}
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