Commit | Line | Data |
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c906108c SS |
1 | |
2 | /* | |
3 | * Ovlymgr.c -- Runtime Overlay Manager for the GDB testsuite. | |
4 | */ | |
5 | ||
6 | #include "ovlymgr.h" | |
ed3bdac4 AB |
7 | #include <string.h> |
8 | #include <stdlib.h> | |
c906108c SS |
9 | |
10 | /* Local functions and data: */ | |
11 | ||
12 | extern unsigned long _ovly_table[][4]; | |
13 | extern unsigned long _novlys __attribute__ ((section (".data"))); | |
14 | enum ovly_index { VMA, SIZE, LMA, MAPPED}; | |
15 | ||
16 | static 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 | ||
26 | static void | |
27 | FlushCache (void) | |
28 | { | |
29 | #ifdef __M32R__ | |
30 | volatile char *mspr = (char *) 0xfffffff7; | |
31 | *mspr = 1; | |
32 | #endif | |
33 | } | |
34 | ||
b22ad7a7 MS |
35 | /* _ovly_debug_event: |
36 | * Debuggers may set a breakpoint here, to be notified | |
37 | * when the overlay table has been modified. | |
38 | */ | |
39 | static void | |
40 | _ovly_debug_event (void) | |
41 | { | |
42 | } | |
43 | ||
c906108c SS |
44 | /* OverlayLoad: |
45 | * Copy the overlay into its runtime region, | |
46 | * and mark the overlay as "mapped". | |
47 | */ | |
48 | ||
49 | bool | |
50 | OverlayLoad (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 (); | |
b22ad7a7 | 71 | _ovly_debug_event (); |
c906108c SS |
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 | ||
81 | bool | |
82 | OverlayUnload (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 | ||
b22ad7a7 | 94 | _ovly_debug_event (); |
c906108c SS |
95 | return TRUE; |
96 | } | |
97 | ||
c906108c SS |
98 | static void |
99 | ovly_copy (unsigned long dst, unsigned long src, long size) | |
100 | { | |
fe6fdd96 | 101 | memcpy ((void *) dst, (void *) src, size); |
c906108c | 102 | } |