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/* |
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* Copyright (C) 2003-2006 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: memory.c,v 1.187 2006/01/14 12:51:59 debug Exp $ |
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* |
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* Functions for handling the memory of an emulated machine. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <sys/types.h> |
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#include <sys/mman.h> |
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|
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#include "cpu.h" |
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#include "machine.h" |
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#include "memory.h" |
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#include "misc.h" |
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|
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|
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extern int verbose; |
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|
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|
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/* |
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* memory_readmax64(): |
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* |
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* Read at most 64 bits of data from a buffer. Length is given by |
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* len, and the byte order by cpu->byte_order. |
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* |
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* This function should not be called with cpu == NULL. |
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*/ |
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uint64_t memory_readmax64(struct cpu *cpu, unsigned char *buf, int len) |
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{ |
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int i, byte_order = cpu->byte_order; |
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uint64_t x = 0; |
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|
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if (len & MEM_PCI_LITTLE_ENDIAN) { |
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len &= ~MEM_PCI_LITTLE_ENDIAN; |
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byte_order = EMUL_LITTLE_ENDIAN; |
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} |
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|
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/* Switch byte order for incoming data, if necessary: */ |
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if (byte_order == EMUL_BIG_ENDIAN) |
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for (i=0; i<len; i++) { |
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x <<= 8; |
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x |= buf[i]; |
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} |
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else |
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for (i=len-1; i>=0; i--) { |
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x <<= 8; |
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x |= buf[i]; |
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} |
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|
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return x; |
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} |
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|
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|
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/* |
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* memory_writemax64(): |
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* |
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* Write at most 64 bits of data to a buffer. Length is given by |
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* len, and the byte order by cpu->byte_order. |
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* |
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* This function should not be called with cpu == NULL. |
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*/ |
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void memory_writemax64(struct cpu *cpu, unsigned char *buf, int len, |
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uint64_t data) |
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{ |
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int i, byte_order = cpu->byte_order; |
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|
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if (len & MEM_PCI_LITTLE_ENDIAN) { |
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len &= ~MEM_PCI_LITTLE_ENDIAN; |
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byte_order = EMUL_LITTLE_ENDIAN; |
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} |
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|
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if (byte_order == EMUL_LITTLE_ENDIAN) |
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for (i=0; i<len; i++) { |
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buf[i] = data & 255; |
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data >>= 8; |
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} |
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else |
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for (i=0; i<len; i++) { |
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buf[len - 1 - i] = data & 255; |
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data >>= 8; |
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} |
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} |
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|
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|
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/* |
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* zeroed_alloc(): |
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* |
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* Allocates a block of memory using mmap(), and if that fails, try |
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* malloc() + memset(). The returned memory block contains only zeroes. |
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*/ |
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void *zeroed_alloc(size_t s) |
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{ |
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void *p = mmap(NULL, s, PROT_READ | PROT_WRITE, |
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MAP_ANON | MAP_PRIVATE, -1, 0); |
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if (p == NULL) { |
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p = malloc(s); |
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if (p == NULL) { |
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fprintf(stderr, "out of memory\n"); |
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exit(1); |
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} |
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memset(p, 0, s); |
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} |
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return p; |
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} |
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|
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|
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/* |
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* memory_new(): |
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* |
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* This function creates a new memory object. An emulated machine needs one |
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* of these. |
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*/ |
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struct memory *memory_new(uint64_t physical_max, int arch) |
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{ |
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struct memory *mem; |
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int bits_per_pagetable = BITS_PER_PAGETABLE; |
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int bits_per_memblock = BITS_PER_MEMBLOCK; |
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int entries_per_pagetable = 1 << BITS_PER_PAGETABLE; |
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int max_bits = MAX_BITS; |
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size_t s; |
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|
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mem = malloc(sizeof(struct memory)); |
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if (mem == NULL) { |
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fprintf(stderr, "out of memory\n"); |
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exit(1); |
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} |
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|
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memset(mem, 0, sizeof(struct memory)); |
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|
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/* Check bits_per_pagetable and bits_per_memblock for sanity: */ |
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if (bits_per_pagetable + bits_per_memblock != max_bits) { |
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fprintf(stderr, "memory_new(): bits_per_pagetable and " |
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"bits_per_memblock mismatch\n"); |
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exit(1); |
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} |
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|
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mem->physical_max = physical_max; |
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mem->dev_dyntrans_alignment = 4095; |
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if (arch == ARCH_ALPHA) |
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mem->dev_dyntrans_alignment = 8191; |
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|
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s = entries_per_pagetable * sizeof(void *); |
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|
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mem->pagetable = (unsigned char *) mmap(NULL, s, |
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PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0); |
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if (mem->pagetable == NULL) { |
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mem->pagetable = malloc(s); |
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if (mem->pagetable == NULL) { |
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fprintf(stderr, "out of memory\n"); |
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exit(1); |
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} |
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memset(mem->pagetable, 0, s); |
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} |
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|
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mem->mmap_dev_minaddr = 0xffffffffffffffffULL; |
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mem->mmap_dev_maxaddr = 0; |
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|
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return mem; |
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} |
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|
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|
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/* |
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* memory_points_to_string(): |
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* |
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* Returns 1 if there's something string-like in emulated memory at address |
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* addr, otherwise 0. |
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*/ |
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int memory_points_to_string(struct cpu *cpu, struct memory *mem, uint64_t addr, |
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int min_string_length) |
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{ |
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int cur_length = 0; |
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unsigned char c; |
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|
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for (;;) { |
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c = '\0'; |
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cpu->memory_rw(cpu, mem, addr+cur_length, |
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&c, sizeof(c), MEM_READ, CACHE_NONE | NO_EXCEPTIONS); |
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if (c=='\n' || c=='\t' || c=='\r' || (c>=' ' && c<127)) { |
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cur_length ++; |
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if (cur_length >= min_string_length) |
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return 1; |
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} else { |
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if (cur_length >= min_string_length) |
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return 1; |
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else |
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return 0; |
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} |
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} |
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} |
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|
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|
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/* |
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* memory_conv_to_string(): |
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* |
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* Convert emulated memory contents to a string, placing it in a buffer |
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* provided by the caller. |
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*/ |
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char *memory_conv_to_string(struct cpu *cpu, struct memory *mem, uint64_t addr, |
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char *buf, int bufsize) |
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{ |
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int len = 0; |
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int output_index = 0; |
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unsigned char c, p='\0'; |
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|
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while (output_index < bufsize-1) { |
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c = '\0'; |
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cpu->memory_rw(cpu, mem, addr+len, &c, sizeof(c), MEM_READ, |
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CACHE_NONE | NO_EXCEPTIONS); |
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buf[output_index] = c; |
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if (c>=' ' && c<127) { |
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len ++; |
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output_index ++; |
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} else if (c=='\n' || c=='\r' || c=='\t') { |
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len ++; |
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buf[output_index] = '\\'; |
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output_index ++; |
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switch (c) { |
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case '\n': p = 'n'; break; |
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case '\r': p = 'r'; break; |
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case '\t': p = 't'; break; |
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} |
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if (output_index < bufsize-1) { |
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buf[output_index] = p; |
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output_index ++; |
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} |
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} else { |
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buf[output_index] = '\0'; |
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return buf; |
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} |
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} |
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|
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buf[bufsize-1] = '\0'; |
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return buf; |
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} |
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|
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|
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/* |
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* memory_device_dyntrans_access(): |
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* |
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* Get the lowest and highest dyntrans access since last time. |
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*/ |
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void memory_device_dyntrans_access(struct cpu *cpu, struct memory *mem, |
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void *extra, uint64_t *low, uint64_t *high) |
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{ |
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int i, j; |
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size_t s; |
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int need_inval = 0; |
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|
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/* TODO: This is O(n), so it might be good to rewrite it some day. |
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For now, it will be enough, as long as this function is not |
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called too often. */ |
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|
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for (i=0; i<mem->n_mmapped_devices; i++) { |
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if (mem->dev_extra[i] == extra && |
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mem->dev_flags[i] & DM_DYNTRANS_WRITE_OK && |
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mem->dev_dyntrans_data[i] != NULL) { |
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if (mem->dev_dyntrans_write_low[i] != (uint64_t) -1) |
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need_inval = 1; |
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if (low != NULL) |
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*low = mem->dev_dyntrans_write_low[i]; |
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mem->dev_dyntrans_write_low[i] = (uint64_t) -1; |
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|
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if (high != NULL) |
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*high = mem->dev_dyntrans_write_high[i]; |
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mem->dev_dyntrans_write_high[i] = 0; |
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|
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if (!need_inval) |
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return; |
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|
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/* Invalidate any pages of this device that might |
| 299 |
be in the dyntrans load/store cache, by marking |
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the pages read-only. */ |
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if (cpu->invalidate_translation_caches != NULL) { |
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for (s=0; s<mem->dev_length[i]; |
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s+=cpu->machine->arch_pagesize) |
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cpu->invalidate_translation_caches |
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(cpu, mem->dev_baseaddr[i] + s, |
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JUST_MARK_AS_NON_WRITABLE |
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| INVALIDATE_PADDR); |
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} |
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|
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if (cpu->machine->arch == ARCH_MIPS) { |
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/* |
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* ... and invalidate the "fast_vaddr_to_ |
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* hostaddr" cache entries that contain |
| 314 |
* pointers to this device: (NOTE: Device i, |
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* cache entry j) |
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*/ |
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for (j=0; j<N_BINTRANS_VADDR_TO_HOST; j++) { |
| 318 |
if (cpu->cd. |
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mips.bintrans_data_hostpage[j] >= |
| 320 |
mem->dev_dyntrans_data[i] && |
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cpu->cd.mips. |
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bintrans_data_hostpage[j] < |
| 323 |
mem->dev_dyntrans_data[i] + |
| 324 |
mem->dev_length[i]) |
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cpu->cd.mips. |
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bintrans_data_hostpage[j] |
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= NULL; |
| 328 |
} |
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} |
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return; |
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} |
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} |
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} |
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|
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|
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/* |
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* memory_device_register(): |
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* |
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* Register a (memory mapped) device by adding it to the dev_* fields of a |
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* memory struct. |
| 341 |
*/ |
| 342 |
void memory_device_register(struct memory *mem, const char *device_name, |
| 343 |
uint64_t baseaddr, uint64_t len, |
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int (*f)(struct cpu *,struct memory *,uint64_t,unsigned char *, |
| 345 |
size_t,int,void *), |
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void *extra, int flags, unsigned char *dyntrans_data) |
| 347 |
{ |
| 348 |
int i, newi = 0; |
| 349 |
|
| 350 |
if (mem->n_mmapped_devices >= MAX_DEVICES) { |
| 351 |
fprintf(stderr, "memory_device_register(): too many " |
| 352 |
"devices registered, cannot register '%s'\n", device_name); |
| 353 |
exit(1); |
| 354 |
} |
| 355 |
|
| 356 |
/* |
| 357 |
* Figure out at which index to insert this device, and simultaneously |
| 358 |
* check for collisions: |
| 359 |
*/ |
| 360 |
newi = -1; |
| 361 |
for (i=0; i<mem->n_mmapped_devices; i++) { |
| 362 |
if (i == 0 && baseaddr + len <= mem->dev_baseaddr[i]) |
| 363 |
newi = i; |
| 364 |
if (i > 0 && baseaddr + len <= mem->dev_baseaddr[i] && |
| 365 |
baseaddr >= mem->dev_endaddr[i-1]) |
| 366 |
newi = i; |
| 367 |
if (i == mem->n_mmapped_devices - 1 && |
| 368 |
baseaddr >= mem->dev_endaddr[i]) |
| 369 |
newi = i + 1; |
| 370 |
|
| 371 |
/* If we are not colliding with device i, then continue: */ |
| 372 |
if (baseaddr + len <= mem->dev_baseaddr[i]) |
| 373 |
continue; |
| 374 |
if (baseaddr >= mem->dev_endaddr[i]) |
| 375 |
continue; |
| 376 |
|
| 377 |
fatal("\nERROR! \"%s\" collides with device %i (\"%s\")!\n", |
| 378 |
device_name, i, mem->dev_name[i]); |
| 379 |
exit(1); |
| 380 |
} |
| 381 |
if (mem->n_mmapped_devices == 0) |
| 382 |
newi = 0; |
| 383 |
if (newi == -1) { |
| 384 |
fatal("INTERNAL ERROR\n"); |
| 385 |
exit(1); |
| 386 |
} |
| 387 |
|
| 388 |
if (verbose >= 2) { |
| 389 |
/* (40 bits of physical address is displayed) */ |
| 390 |
debug("device at 0x%010llx: %s", (long long)baseaddr, |
| 391 |
device_name); |
| 392 |
|
| 393 |
if (flags & (DM_DYNTRANS_OK | DM_DYNTRANS_WRITE_OK) |
| 394 |
&& (baseaddr & mem->dev_dyntrans_alignment) != 0) { |
| 395 |
fatal("\nWARNING: Device dyntrans access, but unaligned" |
| 396 |
" baseaddr 0x%llx.\n", (long long)baseaddr); |
| 397 |
} |
| 398 |
|
| 399 |
if (flags & (DM_DYNTRANS_OK | DM_DYNTRANS_WRITE_OK)) { |
| 400 |
debug(" (dyntrans %s)", |
| 401 |
(flags & DM_DYNTRANS_WRITE_OK)? "R/W" : "R"); |
| 402 |
} |
| 403 |
debug("\n"); |
| 404 |
} |
| 405 |
|
| 406 |
for (i=0; i<mem->n_mmapped_devices; i++) { |
| 407 |
if (dyntrans_data == mem->dev_dyntrans_data[i] && |
| 408 |
mem->dev_flags[i] & (DM_DYNTRANS_OK | DM_DYNTRANS_WRITE_OK) |
| 409 |
&& flags & (DM_DYNTRANS_OK | DM_DYNTRANS_WRITE_OK)) { |
| 410 |
fatal("ERROR: the data pointer used for dyntrans " |
| 411 |
"accesses must only be used once!\n"); |
| 412 |
fatal("(%p cannot be used by '%s'; already in use by '" |
| 413 |
"%s')\n", dyntrans_data, device_name, |
| 414 |
mem->dev_name[i]); |
| 415 |
exit(1); |
| 416 |
} |
| 417 |
} |
| 418 |
|
| 419 |
mem->n_mmapped_devices++; |
| 420 |
|
| 421 |
/* |
| 422 |
* YUCK! This is ugly. TODO: fix |
| 423 |
*/ |
| 424 |
/* Make space for the new entry: */ |
| 425 |
memmove(&mem->dev_name[newi+1], &mem->dev_name[newi], sizeof(char *) * |
| 426 |
(MAX_DEVICES - newi - 1)); |
| 427 |
memmove(&mem->dev_baseaddr[newi+1], &mem->dev_baseaddr[newi], |
| 428 |
sizeof(uint64_t) * (MAX_DEVICES - newi - 1)); |
| 429 |
memmove(&mem->dev_endaddr[newi+1], &mem->dev_endaddr[newi], |
| 430 |
sizeof(uint64_t) * (MAX_DEVICES - newi - 1)); |
| 431 |
memmove(&mem->dev_length[newi+1], &mem->dev_length[newi], |
| 432 |
sizeof(uint64_t) * (MAX_DEVICES - newi - 1)); |
| 433 |
memmove(&mem->dev_flags[newi+1], &mem->dev_flags[newi], sizeof(int) * |
| 434 |
(MAX_DEVICES - newi - 1)); |
| 435 |
memmove(&mem->dev_extra[newi+1], &mem->dev_extra[newi], sizeof(void *) * |
| 436 |
(MAX_DEVICES - newi - 1)); |
| 437 |
memmove(&mem->dev_f[newi+1], &mem->dev_f[newi], sizeof(void *) * |
| 438 |
(MAX_DEVICES - newi - 1)); |
| 439 |
memmove(&mem->dev_dyntrans_data[newi+1], &mem->dev_dyntrans_data[newi], |
| 440 |
sizeof(void *) * (MAX_DEVICES - newi - 1)); |
| 441 |
memmove(&mem->dev_dyntrans_write_low[newi+1], |
| 442 |
&mem->dev_dyntrans_write_low[newi], |
| 443 |
sizeof(uint64_t) * (MAX_DEVICES - newi - 1)); |
| 444 |
memmove(&mem->dev_dyntrans_write_high[newi+1], |
| 445 |
&mem->dev_dyntrans_write_high[newi], |
| 446 |
sizeof(uint64_t) * (MAX_DEVICES - newi - 1)); |
| 447 |
|
| 448 |
|
| 449 |
mem->dev_name[newi] = strdup(device_name); |
| 450 |
mem->dev_baseaddr[newi] = baseaddr; |
| 451 |
mem->dev_endaddr[newi] = baseaddr + len; |
| 452 |
mem->dev_length[newi] = len; |
| 453 |
mem->dev_flags[newi] = flags; |
| 454 |
mem->dev_dyntrans_data[newi] = dyntrans_data; |
| 455 |
|
| 456 |
if (mem->dev_name[newi] == NULL) { |
| 457 |
fprintf(stderr, "out of memory\n"); |
| 458 |
exit(1); |
| 459 |
} |
| 460 |
|
| 461 |
if (flags & (DM_DYNTRANS_OK | DM_DYNTRANS_WRITE_OK) |
| 462 |
&& !(flags & DM_EMULATED_RAM) && dyntrans_data == NULL) { |
| 463 |
fatal("\nERROR: Device dyntrans access, but dyntrans_data" |
| 464 |
" = NULL!\n"); |
| 465 |
exit(1); |
| 466 |
} |
| 467 |
|
| 468 |
if ((size_t)dyntrans_data & (sizeof(void *) - 1)) { |
| 469 |
fprintf(stderr, "memory_device_register():" |
| 470 |
" dyntrans_data not aligned correctly (%p)\n", |
| 471 |
dyntrans_data); |
| 472 |
exit(1); |
| 473 |
} |
| 474 |
|
| 475 |
mem->dev_dyntrans_write_low[newi] = (uint64_t)-1; |
| 476 |
mem->dev_dyntrans_write_high[newi] = 0; |
| 477 |
mem->dev_f[newi] = f; |
| 478 |
mem->dev_extra[newi] = extra; |
| 479 |
|
| 480 |
if (baseaddr < mem->mmap_dev_minaddr) |
| 481 |
mem->mmap_dev_minaddr = baseaddr & ~mem->dev_dyntrans_alignment; |
| 482 |
if (baseaddr + len > mem->mmap_dev_maxaddr) |
| 483 |
mem->mmap_dev_maxaddr = (((baseaddr + len) - 1) | |
| 484 |
mem->dev_dyntrans_alignment) + 1; |
| 485 |
} |
| 486 |
|
| 487 |
|
| 488 |
/* |
| 489 |
* memory_device_remove(): |
| 490 |
* |
| 491 |
* Unregister a (memory mapped) device from a memory struct. |
| 492 |
*/ |
| 493 |
void memory_device_remove(struct memory *mem, int i) |
| 494 |
{ |
| 495 |
if (i < 0 || i >= mem->n_mmapped_devices) { |
| 496 |
fatal("memory_device_remove(): invalid device number %i\n", i); |
| 497 |
return; |
| 498 |
} |
| 499 |
|
| 500 |
mem->n_mmapped_devices --; |
| 501 |
|
| 502 |
if (i == mem->n_mmapped_devices) |
| 503 |
return; |
| 504 |
|
| 505 |
/* |
| 506 |
* YUCK! This is ugly. TODO: fix |
| 507 |
*/ |
| 508 |
|
| 509 |
memmove(&mem->dev_name[i], &mem->dev_name[i+1], sizeof(char *) * |
| 510 |
(MAX_DEVICES - i - 1)); |
| 511 |
memmove(&mem->dev_baseaddr[i], &mem->dev_baseaddr[i+1], |
| 512 |
sizeof(uint64_t) * (MAX_DEVICES - i - 1)); |
| 513 |
memmove(&mem->dev_endaddr[i], &mem->dev_endaddr[i+1], |
| 514 |
sizeof(uint64_t) * (MAX_DEVICES - i - 1)); |
| 515 |
memmove(&mem->dev_length[i], &mem->dev_length[i+1], sizeof(uint64_t) * |
| 516 |
(MAX_DEVICES - i - 1)); |
| 517 |
memmove(&mem->dev_flags[i], &mem->dev_flags[i+1], sizeof(int) * |
| 518 |
(MAX_DEVICES - i - 1)); |
| 519 |
memmove(&mem->dev_extra[i], &mem->dev_extra[i+1], sizeof(void *) * |
| 520 |
(MAX_DEVICES - i - 1)); |
| 521 |
memmove(&mem->dev_f[i], &mem->dev_f[i+1], sizeof(void *) * |
| 522 |
(MAX_DEVICES - i - 1)); |
| 523 |
memmove(&mem->dev_dyntrans_data[i], &mem->dev_dyntrans_data[i+1], |
| 524 |
sizeof(void *) * (MAX_DEVICES - i - 1)); |
| 525 |
memmove(&mem->dev_dyntrans_write_low[i], &mem->dev_dyntrans_write_low |
| 526 |
[i+1], sizeof(uint64_t) * (MAX_DEVICES - i - 1)); |
| 527 |
memmove(&mem->dev_dyntrans_write_high[i], &mem->dev_dyntrans_write_high |
| 528 |
[i+1], sizeof(uint64_t) * (MAX_DEVICES - i - 1)); |
| 529 |
} |
| 530 |
|
| 531 |
|
| 532 |
#define MEMORY_RW userland_memory_rw |
| 533 |
#define MEM_USERLAND |
| 534 |
#include "memory_rw.c" |
| 535 |
#undef MEM_USERLAND |
| 536 |
#undef MEMORY_RW |
| 537 |
|
| 538 |
|
| 539 |
/* |
| 540 |
* memory_paddr_to_hostaddr(): |
| 541 |
* |
| 542 |
* Translate a physical address into a host address. |
| 543 |
* |
| 544 |
* Return value is a pointer to a host memblock, or NULL on failure. |
| 545 |
* On reads, a NULL return value should be interpreted as reading all zeroes. |
| 546 |
*/ |
| 547 |
unsigned char *memory_paddr_to_hostaddr(struct memory *mem, |
| 548 |
uint64_t paddr, int writeflag) |
| 549 |
{ |
| 550 |
void **table; |
| 551 |
int entry; |
| 552 |
const int mask = (1 << BITS_PER_PAGETABLE) - 1; |
| 553 |
const int shrcount = MAX_BITS - BITS_PER_PAGETABLE; |
| 554 |
|
| 555 |
table = mem->pagetable; |
| 556 |
entry = (paddr >> shrcount) & mask; |
| 557 |
|
| 558 |
/* printf("memory_paddr_to_hostaddr(): p=%16llx w=%i => entry=0x%x\n", |
| 559 |
(long long)paddr, writeflag, entry); */ |
| 560 |
|
| 561 |
if (table[entry] == NULL) { |
| 562 |
size_t alloclen; |
| 563 |
|
| 564 |
/* |
| 565 |
* Special case: reading from a nonexistant memblock |
| 566 |
* returns all zeroes, and doesn't allocate anything. |
| 567 |
* (If any intermediate pagetable is nonexistant, then |
| 568 |
* the same thing happens): |
| 569 |
*/ |
| 570 |
if (writeflag == MEM_READ) |
| 571 |
return NULL; |
| 572 |
|
| 573 |
/* Allocate a memblock: */ |
| 574 |
alloclen = 1 << BITS_PER_MEMBLOCK; |
| 575 |
|
| 576 |
/* printf(" allocating for entry %i, len=%i\n", |
| 577 |
entry, alloclen); */ |
| 578 |
|
| 579 |
/* Anonymous mmap() should return zero-filled memory, |
| 580 |
try malloc + memset if mmap failed. */ |
| 581 |
table[entry] = (void *) mmap(NULL, alloclen, |
| 582 |
PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0); |
| 583 |
if (table[entry] == NULL) { |
| 584 |
table[entry] = malloc(alloclen); |
| 585 |
if (table[entry] == NULL) { |
| 586 |
fatal("out of memory\n"); |
| 587 |
exit(1); |
| 588 |
} |
| 589 |
memset(table[entry], 0, alloclen); |
| 590 |
} |
| 591 |
} |
| 592 |
|
| 593 |
return (unsigned char *) table[entry]; |
| 594 |
} |
| 595 |
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