Mercurial > repos > blastem
view backend.c @ 681:e26640daf1ae
Prevent an infinite loop when handling out of bounds addresses in translate_m68k_stream
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 04 Jan 2015 23:21:56 -0800 |
parents | 98927f1b005b |
children | fc04781f4d28 |
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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 "backend.h" #include <stdlib.h> deferred_addr * defer_address(deferred_addr * old_head, uint32_t address, uint8_t *dest) { deferred_addr * new_head = malloc(sizeof(deferred_addr)); new_head->next = old_head; new_head->address = address & 0xFFFFFF; new_head->dest = dest; return new_head; } void remove_deferred_until(deferred_addr **head_ptr, deferred_addr * remove_to) { for(deferred_addr *cur = *head_ptr; cur && cur != remove_to; cur = *head_ptr) { *head_ptr = cur->next; free(cur); } } void process_deferred(deferred_addr ** head_ptr, void * context, native_addr_func get_native) { deferred_addr * cur = *head_ptr; deferred_addr **last_next = head_ptr; while(cur) { code_ptr native = get_native(context, cur->address);//get_native_address(opts->native_code_map, cur->address); if (native) { int32_t disp = native - (cur->dest + 4); code_ptr out = cur->dest; *(out++) = disp; disp >>= 8; *(out++) = disp; disp >>= 8; *(out++) = disp; disp >>= 8; *out = disp; *last_next = cur->next; free(cur); cur = *last_next; } else { last_next = &(cur->next); cur = cur->next; } } } void * get_native_pointer(uint32_t address, void ** mem_pointers, cpu_options * opts) { memmap_chunk const * memmap = opts->memmap; address &= opts->address_mask; for (uint32_t chunk = 0; chunk < opts->memmap_chunks; chunk++) { if (address >= memmap[chunk].start && address < memmap[chunk].end) { if (!(memmap[chunk].flags & MMAP_READ)) { return NULL; } uint8_t * base = memmap[chunk].flags & MMAP_PTR_IDX ? mem_pointers[memmap[chunk].ptr_index] : memmap[chunk].buffer; if (!base) { return NULL; } return base + (address & memmap[chunk].mask); } } return NULL; }