Mercurial > repos > blastem

annotate mem.c @ 1356:4d16c09210fd

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fix resampling code to deal with case in which output frequency is greater than the input frequency. Probably could stand to be improved, but at least it doesn't cause the emulator to deadlock
author Michael Pavone <pavone@retrodev.com>
date Thu, 11 May 2017 07:51:28 -0700
parents 101b5ce682fe
children 8e86cd581620
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
467
140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
Mike Pavone <pavone@retrodev.com>
parents: 18
diff changeset
1 /*
140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
Mike Pavone <pavone@retrodev.com>
parents: 18
diff changeset
2 Copyright 2013 Michael Pavone
883
9f149f0e98b7 It is now possible to switch back and forth between the menu ROM and the game
Michael Pavone <pavone@retrodev.com>
parents: 784
diff changeset
3 This file is part of BlastEm.
467
140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
Mike Pavone <pavone@retrodev.com>
parents: 18
diff changeset
4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
Mike Pavone <pavone@retrodev.com>
parents: 18
diff changeset
5 */
14
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
6 #include <sys/mman.h>
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
7 #include <stddef.h>
18
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
8 #include <stdint.h>
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
9 #include <stdlib.h>
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
10 #include <unistd.h>
784
c3e3a0d734e2 Better error handling in alloc_code
Michael Pavone <pavone@retrodev.com>
parents: 759
diff changeset
11 #include <errno.h>
c3e3a0d734e2 Better error handling in alloc_code
Michael Pavone <pavone@retrodev.com>
parents: 759
diff changeset
12 #include <stdio.h>
758
b52cd6854c28 Use mmap with a hint rather than sbrk for allocating executable memory within 32-bit displacement range of compiled code
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
13
14
2bdad0f52f42 x86 code gen, initial work on translator
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
14 #include "mem.h"
883
9f149f0e98b7 It is now possible to switch back and forth between the menu ROM and the game
Michael Pavone <pavone@retrodev.com>
parents: 784
diff changeset
15 #include "arena.h"
758
b52cd6854c28 Use mmap with a hint rather than sbrk for allocating executable memory within 32-bit displacement range of compiled code
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
16 #ifndef MAP_ANONYMOUS
b52cd6854c28 Use mmap with a hint rather than sbrk for allocating executable memory within 32-bit displacement range of compiled code
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
17 #define MAP_ANONYMOUS MAP_ANON
b52cd6854c28 Use mmap with a hint rather than sbrk for allocating executable memory within 32-bit displacement range of compiled code
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
18 #endif
18
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
19
759
c47e1750c264 Use MAP_32BIT on Linux since my hint seems to be ignored
Michael Pavone <pavone@retrodev.com>
parents: 758
diff changeset
20 #ifndef MAP_32BIT
c47e1750c264 Use MAP_32BIT on Linux since my hint seems to be ignored
Michael Pavone <pavone@retrodev.com>
parents: 758
diff changeset
21 #define MAP_32BIT 0
c47e1750c264 Use MAP_32BIT on Linux since my hint seems to be ignored
Michael Pavone <pavone@retrodev.com>
parents: 758
diff changeset
22 #endif
c47e1750c264 Use MAP_32BIT on Linux since my hint seems to be ignored
Michael Pavone <pavone@retrodev.com>
parents: 758
diff changeset
23
18
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
24 void * alloc_code(size_t *size)
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
25 {
758
b52cd6854c28 Use mmap with a hint rather than sbrk for allocating executable memory within 32-bit displacement range of compiled code
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
26 //start at the 1GB mark to allow plenty of room for sbrk based malloc implementations
b52cd6854c28 Use mmap with a hint rather than sbrk for allocating executable memory within 32-bit displacement range of compiled code
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
27 //while still keeping well within 32-bit displacement range for calling code compiled into the executable
b52cd6854c28 Use mmap with a hint rather than sbrk for allocating executable memory within 32-bit displacement range of compiled code
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
28 static uint8_t *next = (uint8_t *)0x40000000;
883
9f149f0e98b7 It is now possible to switch back and forth between the menu ROM and the game
Michael Pavone <pavone@retrodev.com>
parents: 784
diff changeset
29 uint8_t *ret = try_alloc_arena();
9f149f0e98b7 It is now possible to switch back and forth between the menu ROM and the game
Michael Pavone <pavone@retrodev.com>
parents: 784
diff changeset
30 if (ret) {
9f149f0e98b7 It is now possible to switch back and forth between the menu ROM and the game
Michael Pavone <pavone@retrodev.com>
parents: 784
diff changeset
31 return ret;
9f149f0e98b7 It is now possible to switch back and forth between the menu ROM and the game
Michael Pavone <pavone@retrodev.com>
parents: 784
diff changeset
32 }
1340
101b5ce682fe Fix some inconsequential issues in code for executable memory allocation noticed while tracking down a different issue
Michael Pavone <pavone@retrodev.com>
parents: 904
diff changeset
33 if (*size & (PAGE_SIZE -1)) {
101b5ce682fe Fix some inconsequential issues in code for executable memory allocation noticed while tracking down a different issue
Michael Pavone <pavone@retrodev.com>
parents: 904
diff changeset
34 *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1));
101b5ce682fe Fix some inconsequential issues in code for executable memory allocation noticed while tracking down a different issue
Michael Pavone <pavone@retrodev.com>
parents: 904
diff changeset
35 }
101b5ce682fe Fix some inconsequential issues in code for executable memory allocation noticed while tracking down a different issue
Michael Pavone <pavone@retrodev.com>
parents: 904
diff changeset
36 ret = mmap(next, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, -1, 0);
784
c3e3a0d734e2 Better error handling in alloc_code
Michael Pavone <pavone@retrodev.com>
parents: 759
diff changeset
37 if (ret == MAP_FAILED) {
c3e3a0d734e2 Better error handling in alloc_code
Michael Pavone <pavone@retrodev.com>
parents: 759
diff changeset
38 perror("alloc_code");
c3e3a0d734e2 Better error handling in alloc_code
Michael Pavone <pavone@retrodev.com>
parents: 759
diff changeset
39 return NULL;
c3e3a0d734e2 Better error handling in alloc_code
Michael Pavone <pavone@retrodev.com>
parents: 759
diff changeset
40 }
904
6bafe1988e8c Actually call track_block in alloc_code
Michael Pavone <pavone@retrodev.com>
parents: 883
diff changeset
41 track_block(ret);
758
b52cd6854c28 Use mmap with a hint rather than sbrk for allocating executable memory within 32-bit displacement range of compiled code
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
42 next = ret + *size;
18
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
43 return ret;
3e7bfde7606e M68K to x86 translation works for a limited subset of instructions and addressing modes
Mike Pavone <pavone@retrodev.com>
parents: 14
diff changeset
44 }
758
b52cd6854c28 Use mmap with a hint rather than sbrk for allocating executable memory within 32-bit displacement range of compiled code
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
45