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65bd4159b3
We're only using fairly portable standard Unix calls here, so might as well save ourselves future trouble by enabling on all Unices by default. https://bugs.freedesktop.org/show_bug.cgi?id=90904 Reviewed-by: Brian Paul <brianp@vmware.com> Reviewed-by: Roland Scheidegger <sroland@vmware.com>
173 lines
3.6 KiB
C
173 lines
3.6 KiB
C
/**************************************************************************
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*
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* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* \file exemem.c
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* Functions for allocating executable memory.
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*
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* \author Keith Whitwell
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*/
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#include "pipe/p_compiler.h"
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#include "util/u_debug.h"
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#include "os/os_thread.h"
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#include "util/u_memory.h"
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#include "rtasm_execmem.h"
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#ifndef MAP_ANONYMOUS
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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#if defined(PIPE_OS_WINDOWS)
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN 1
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#endif
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#include <windows.h>
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#endif
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#if defined(PIPE_OS_UNIX)
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/*
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* Allocate a large block of memory which can hold code then dole it out
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* in pieces by means of the generic memory manager code.
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*/
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#include <unistd.h>
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#include <sys/mman.h>
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#include "util/u_mm.h"
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#define EXEC_HEAP_SIZE (10*1024*1024)
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pipe_static_mutex(exec_mutex);
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static struct mem_block *exec_heap = NULL;
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static unsigned char *exec_mem = NULL;
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static int
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init_heap(void)
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{
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if (!exec_heap)
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exec_heap = u_mmInit( 0, EXEC_HEAP_SIZE );
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if (!exec_mem)
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exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE,
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PROT_EXEC | PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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return (exec_mem != MAP_FAILED);
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}
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void *
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rtasm_exec_malloc(size_t size)
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{
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struct mem_block *block = NULL;
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void *addr = NULL;
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pipe_mutex_lock(exec_mutex);
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if (!init_heap())
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goto bail;
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if (exec_heap) {
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size = (size + 31) & ~31; /* next multiple of 32 bytes */
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block = u_mmAllocMem( exec_heap, size, 5, 0 ); /* 5 -> 32-byte alignment */
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}
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if (block)
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addr = exec_mem + block->ofs;
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else
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debug_printf("rtasm_exec_malloc failed\n");
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bail:
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pipe_mutex_unlock(exec_mutex);
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return addr;
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}
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void
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rtasm_exec_free(void *addr)
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{
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pipe_mutex_lock(exec_mutex);
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if (exec_heap) {
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struct mem_block *block = u_mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
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if (block)
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u_mmFreeMem(block);
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}
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pipe_mutex_unlock(exec_mutex);
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}
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#elif defined(PIPE_OS_WINDOWS)
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/*
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* Avoid Data Execution Prevention.
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*/
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void *
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rtasm_exec_malloc(size_t size)
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{
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return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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}
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void
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rtasm_exec_free(void *addr)
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{
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VirtualFree(addr, 0, MEM_RELEASE);
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}
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#else
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/*
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* Just use regular memory.
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*/
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void *
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rtasm_exec_malloc(size_t size)
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{
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return MALLOC( size );
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}
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void
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rtasm_exec_free(void *addr)
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{
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FREE(addr);
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}
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#endif
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