summaryrefslogtreecommitdiffstatshomepage
path: root/src/osd/windows/winmisc.c
blob: c83613a5e376fc46c6ea6b9a3bf486525bb9e055 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
//============================================================
//
//  winmisc.c - Win32 OSD core miscellaneous functions
//
//============================================================
//
//  Copyright Aaron Giles
//  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.
//    * Neither the name 'MAME' nor the names of its
//      contributors may be used to endorse or promote
//      products derived from this software without specific
//      prior written permission.
//
//  THIS SOFTWARE IS PROVIDED BY AARON GILES ''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 AARON GILES BE LIABLE FOR ANY DIRECT,
//  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
//  DAMAGE (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.
//
//============================================================

// standard windows headers
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <tchar.h>

// MAME headers
#include "osdcore.h"

// MAMEOS headers
#include "winutf8.h"
#include "strconv.h"
#include "strconv.h"


//============================================================
//  MACROS
//============================================================

// presumed size of a page of memory
#define PAGE_SIZE			4096

// align allocations to start or end of the page?
#define GUARD_ALIGN_START	0



//============================================================
//  GLOBAL VARIABLES
//============================================================

void (*s_debugger_stack_crawler)() = NULL;



//============================================================
//  osd_malloc
//============================================================

void *osd_malloc(size_t size)
{
#ifndef MALLOC_DEBUG
	return HeapAlloc(GetProcessHeap(), 0, size);
#else
	// add in space for the size
	size += sizeof(size_t);

	// basic objects just come from the heap
	void *result = HeapAlloc(GetProcessHeap(), 0, size);

	// store the size and return and pointer to the data afterward
	*reinterpret_cast<size_t *>(result) = size;
	return reinterpret_cast<UINT8 *>(result) + sizeof(size_t);
#endif
}


//============================================================
//  osd_malloc_array
//============================================================

void *osd_malloc_array(size_t size)
{
#ifndef MALLOC_DEBUG
	return HeapAlloc(GetProcessHeap(), 0, size);
#else
	// add in space for the size
	size += sizeof(size_t);

	// round the size up to a page boundary
	size_t rounded_size = ((size + sizeof(void *) + PAGE_SIZE - 1) / PAGE_SIZE) * PAGE_SIZE;

	// reserve that much memory, plus two guard pages
	void *page_base = VirtualAlloc(NULL, rounded_size + 2 * PAGE_SIZE, MEM_RESERVE, PAGE_NOACCESS);
	if (page_base == NULL)
		return NULL;

	// now allow access to everything but the first and last pages
	page_base = VirtualAlloc(reinterpret_cast<UINT8 *>(page_base) + PAGE_SIZE, rounded_size, MEM_COMMIT, PAGE_READWRITE);
	if (page_base == NULL)
		return NULL;

	// work backwards from the page base to get to the block base
	void *result = GUARD_ALIGN_START ? page_base : (reinterpret_cast<UINT8 *>(page_base) + rounded_size - size);

	// store the size at the start with a flag indicating it has a guard page
	*reinterpret_cast<size_t *>(result) = size | 0x80000000;
	return reinterpret_cast<UINT8 *>(result) + sizeof(size_t);
#endif
}


//============================================================
//  osd_free
//============================================================

void osd_free(void *ptr)
{
#ifndef MALLOC_DEBUG
	HeapFree(GetProcessHeap(), 0, ptr);
#else
	size_t size = reinterpret_cast<size_t *>(ptr)[-1];

	// if no guard page, just free the pointer
	if ((size & 0x80000000) == 0)
		HeapFree(GetProcessHeap(), 0, reinterpret_cast<UINT8 *>(ptr) - sizeof(size_t));

	// large items need more care
	else
	{
		ULONG_PTR page_base = (reinterpret_cast<ULONG_PTR>(ptr) - sizeof(size_t)) & ~(PAGE_SIZE - 1);
		VirtualFree(reinterpret_cast<void *>(page_base - PAGE_SIZE), 0, MEM_RELEASE);
	}
#endif
}


//============================================================
//  osd_alloc_executable
//============================================================

void *osd_alloc_executable(size_t size)
{
	return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
}


//============================================================
//  osd_free_executable
//============================================================

void osd_free_executable(void *ptr, size_t size)
{
	VirtualFree(ptr, 0, MEM_RELEASE);
}


//============================================================
//  osd_break_into_debugger
//============================================================

void osd_break_into_debugger(const char *message)
{
	if (IsDebuggerPresent())
	{
		win_output_debug_string_utf8(message);
		DebugBreak();
	}
	else if (s_debugger_stack_crawler != NULL)
		(*s_debugger_stack_crawler)();
}