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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert, R. Belmont
//============================================================
//
// sdlos_*.c - OS specific low level code
//
// SDLMAME by Olivier Galibert and R. Belmont
//
//============================================================
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <mmsystem.h>
#include <stdlib.h>
#ifndef _MSC_VER
#include <unistd.h>
#endif
// MAME headers
#include "osdlib.h"
#include "osdcomm.h"
#include "osdcore.h"
#ifdef OSD_WINDOWS
#include "winutf8.h"
#endif
//============================================================
// 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
#if defined(__BIGGEST_ALIGNMENT__)
#define MAX_ALIGNMENT __BIGGEST_ALIGNMENT__
#elif defined(__AVX__)
#define MAX_ALIGNMENT 32
#elif defined(__SSE__) || defined(__x86_64__) || defined(_M_X64)
#define MAX_ALIGNMENT 16
#else
#define MAX_ALIGNMENT sizeof(INT64)
#endif
//============================================================
// GLOBAL VARIABLES
//============================================================
#ifdef OSD_WINDOWS
void (*s_debugger_stack_crawler)() = NULL;
#endif
//============================================================
// osd_getenv
//============================================================
const char *osd_getenv(const char *name)
{
return getenv(name);
}
//============================================================
// osd_setenv
//============================================================
int osd_setenv(const char *name, const char *value, int overwrite)
{
char *buf;
int result;
if (!overwrite)
{
if (osd_getenv(name) != nullptr)
return 0;
}
buf = (char *) osd_malloc_array(strlen(name)+strlen(value)+2);
sprintf(buf, "%s=%s", name, value);
result = putenv(buf);
/* will be referenced by environment
* Therefore it is not freed here
*/
return result;
}
//============================================================
// osd_process_kill
//============================================================
void osd_process_kill(void)
{
TerminateProcess(GetCurrentProcess(), -1);
}
//============================================================
// osd_malloc
//============================================================
void *osd_malloc(size_t size)
{
#ifndef MALLOC_DEBUG
return malloc(size);
#else
// add in space for the size and offset
size += MAX_ALIGNMENT + sizeof(size_t) + 2;
size &= ~size_t(1);
// basic objects just come from the heap
UINT8 *const block = reinterpret_cast<UINT8 *>(HeapAlloc(GetProcessHeap(), 0, size));
if (block == NULL)
return NULL;
UINT8 *const result = reinterpret_cast<UINT8 *>(reinterpret_cast<FPTR>(block + sizeof(size_t) + MAX_ALIGNMENT) & ~(FPTR(MAX_ALIGNMENT) - 1));
// store the size and return and pointer to the data afterward
*reinterpret_cast<size_t *>(block) = size;
*(result - 1) = result - block;
return result;
#endif
}
//============================================================
// osd_malloc_array
//============================================================
void *osd_malloc_array(size_t size)
{
#ifndef MALLOC_DEBUG
return malloc(size);
#else
// add in space for the size and offset
size += MAX_ALIGNMENT + sizeof(size_t) + 2;
size &= ~size_t(1);
// round the size up to a page boundary
size_t const 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
UINT8 *const block = GUARD_ALIGN_START ? reinterpret_cast<UINT8 *>(page_base) : (reinterpret_cast<UINT8 *>(page_base) + rounded_size - size);
UINT8 *const result = reinterpret_cast<UINT8 *>(reinterpret_cast<FPTR>(block + sizeof(size_t) + MAX_ALIGNMENT) & ~(FPTR(MAX_ALIGNMENT) - 1));
// store the size at the start with a flag indicating it has a guard page
*reinterpret_cast<size_t *>(block) = size | 1;
*(result - 1) = result - block;
return result;
#endif
}
//============================================================
// osd_free
//============================================================
void osd_free(void *ptr)
{
#ifndef MALLOC_DEBUG
free(ptr);
#else
UINT8 const offset = *(reinterpret_cast<UINT8 *>(ptr) - 1);
UINT8 *const block = reinterpret_cast<UINT8 *>(ptr) - offset;
size_t const size = *reinterpret_cast<size_t *>(block);
if ((size & 0x1) == 0)
{
// if no guard page, just free the pointer
HeapFree(GetProcessHeap(), 0, block);
}
else
{
// large items need more care
ULONG_PTR const page_base = reinterpret_cast<ULONG_PTR>(block) & ~(PAGE_SIZE - 1);
VirtualFree(reinterpret_cast<void *>(page_base - PAGE_SIZE), 0, MEM_RELEASE);
}
#endif
}
//============================================================
// osd_alloc_executable
//
// allocates "size" bytes of executable memory. this must take
// things like NX support into account.
//============================================================
void *osd_alloc_executable(size_t size)
{
return VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
}
//============================================================
// osd_free_executable
//
// frees memory allocated with osd_alloc_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)
{
#ifdef OSD_WINDOWS
if (IsDebuggerPresent())
{
win_output_debug_string_utf8(message);
DebugBreak();
}
else if (s_debugger_stack_crawler != NULL)
(*s_debugger_stack_crawler)();
#else
if (IsDebuggerPresent())
{
OutputDebugStringA(message);
DebugBreak();
}
#endif
}
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