1
2/*
3 * Ovlymgr.c -- Runtime Overlay Manager for the GDB testsuite.
4 */
5
6#include "ovlymgr.h"
7#include <string.h>
8#include <stdlib.h>
9
10/* Local functions and data: */
11
12extern unsigned long _ovly_table[][4];
13extern unsigned long _novlys __attribute__ ((section (".data")));
14enum ovly_index { VMA, SIZE, LMA, MAPPED};
15
16static void ovly_copy (unsigned long dst, unsigned long src, long size);
17
18/* Flush the data and instruction caches at address START for SIZE bytes.
19   Support for each new port must be added here.  */
20/* FIXME: Might be better to have a standard libgloss function that
21   ports provide that we can then use.  Use libgloss instead of newlib
22   since libgloss is the one intended to handle low level system issues.
23   I would suggest something like _flush_cache to avoid the user's namespace
24   but not be completely obscure as other things may need this facility.  */
25
26static void
27FlushCache (void)
28{
29#ifdef __M32R__
30  volatile char *mspr = (char *) 0xfffffff7;
31  *mspr = 1;
32#endif
33}
34
35/* _ovly_debug_event:
36 * Debuggers may set a breakpoint here, to be notified
37 * when the overlay table has been modified.
38 */
39static void
40_ovly_debug_event (void)
41{
42}
43
44/* OverlayLoad:
45 * Copy the overlay into its runtime region,
46 * and mark the overlay as "mapped".
47 */
48
49bool
50OverlayLoad (unsigned long ovlyno)
51{
52  unsigned long i;
53
54  if (ovlyno < 0 || ovlyno >= _novlys)
55    exit (-1);	/* fail, bad ovly number */
56
57  if (_ovly_table[ovlyno][MAPPED])
58    return TRUE;	/* this overlay already mapped -- nothing to do! */
59
60  for (i = 0; i < _novlys; i++)
61    if (i == ovlyno)
62      _ovly_table[i][MAPPED] = 1;	/* this one now mapped */
63    else if (_ovly_table[i][VMA] == _ovly_table[ovlyno][VMA])
64      _ovly_table[i][MAPPED] = 0;	/* this one now un-mapped */
65
66  ovly_copy (_ovly_table[ovlyno][VMA],
67	     _ovly_table[ovlyno][LMA],
68	     _ovly_table[ovlyno][SIZE]);
69
70  FlushCache ();
71  _ovly_debug_event ();
72  return TRUE;
73}
74
75/* OverlayUnload:
76 * Copy the overlay back into its "load" region.
77 * Does NOT mark overlay as "unmapped", therefore may be called
78 * more than once for the same mapped overlay.
79 */
80
81bool
82OverlayUnload (unsigned long ovlyno)
83{
84  if (ovlyno < 0 || ovlyno >= _novlys)
85    exit (-1);  /* fail, bad ovly number */
86
87  if (!_ovly_table[ovlyno][MAPPED])
88    exit (-1);  /* error, can't copy out a segment that's not "in" */
89
90  ovly_copy (_ovly_table[ovlyno][LMA],
91	     _ovly_table[ovlyno][VMA],
92	     _ovly_table[ovlyno][SIZE]);
93
94  _ovly_debug_event ();
95  return TRUE;
96}
97
98static void
99ovly_copy (unsigned long dst, unsigned long src, long size)
100{
101  memcpy ((void *) dst, (void *) src, size);
102}
103