Mercurial > repos > blastem
view mem.c @ 1925:039553703c20
Don't apply address and cd register changes to the 'live' registers until pending flag is cleared, but do preserve the upper address bits in the latch. Fixes regression in Overdrive 2 while preserving fix to Mona in 344 bytes
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 13 Apr 2020 20:43:25 -0700 |
parents | 101b5ce682fe |
children | 8e86cd581620 |
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/* Copyright 2013 Michael Pavone This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #include <sys/mman.h> #include <stddef.h> #include <stdint.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <stdio.h> #include "mem.h" #include "arena.h" #ifndef MAP_ANONYMOUS #define MAP_ANONYMOUS MAP_ANON #endif #ifndef MAP_32BIT #define MAP_32BIT 0 #endif void * alloc_code(size_t *size) { //start at the 1GB mark to allow plenty of room for sbrk based malloc implementations //while still keeping well within 32-bit displacement range for calling code compiled into the executable static uint8_t *next = (uint8_t *)0x40000000; uint8_t *ret = try_alloc_arena(); if (ret) { return ret; } if (*size & (PAGE_SIZE -1)) { *size += PAGE_SIZE - (*size & (PAGE_SIZE - 1)); } ret = mmap(next, *size, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, -1, 0); if (ret == MAP_FAILED) { perror("alloc_code"); return NULL; } track_block(ret); next = ret + *size; return ret; }