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https://github.com/kanjitalk755/macemu.git
synced 2024-09-03 21:29:03 +00:00
Changes made to the update routines
- Cleaned up the process for determining the ranges of pages touched that have to be blitted onto the screen (find_next_page_set() and find_next_page_clear() functions) Changes made to do_handle_screen_fault() - An unhandled address is now dealt by the default SIGSEGV handler - Print out the address of the instruction that caused the exception
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@ -240,19 +240,31 @@ static fbcopy_func fbcopy_funcs[ID_DEPTH_COUNT][2][2] = {
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* Screen fault handler
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*/
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static inline void do_handle_screen_fault(uintptr addr)
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const uintptr INVALID_PC = (uintptr)-1;
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static inline void do_handle_screen_fault(uintptr addr, uintptr pc = INVALID_PC)
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{
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if ((addr < mainBuffer.memStart) || (addr >= mainBuffer.memEnd)) {
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fprintf(stderr, "Segmentation fault at 0x%08X\n", addr);
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abort();
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/* Someone attempted to write to the frame buffer. Make it writeable
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* now so that the data could actually be written. It will be made
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* read-only back in one of the screen update_*() functions.
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*/
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if ((addr >= mainBuffer.memStart) && (addr < mainBuffer.memEnd)) {
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const int page = (addr - mainBuffer.memStart) >> mainBuffer.pageBits;
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caddr_t page_ad = (caddr_t)(addr & ~(mainBuffer.pageSize - 1));
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LOCK_VOSF;
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PFLAG_SET(page);
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mprotect(page_ad, mainBuffer.pageSize, PROT_READ | PROT_WRITE);
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UNLOCK_VOSF;
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return;
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}
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const int page = (addr - mainBuffer.memStart) >> mainBuffer.pageBits;
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caddr_t page_ad = (caddr_t)(addr & ~(mainBuffer.pageSize - 1));
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LOCK_VOSF;
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PFLAG_SET(page);
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mprotect(page_ad, mainBuffer.pageSize, PROT_READ | PROT_WRITE);
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UNLOCK_VOSF;
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/* Otherwise, we don't know how to handle the fault, let it crash */
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fprintf(stderr, "do_handle_screen_fault: unhandled address 0x%08X", addr);
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if (pc != INVALID_PC)
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fprintf(stderr, " [IP=0x%08X]", pc);
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fprintf(stderr, "\n");
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signal(SIGSEGV, SIG_DFL);
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}
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#if defined(HAVE_SIGINFO_T)
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@ -269,7 +281,7 @@ static void Screen_fault_handler(int, siginfo_t * sip, void *)
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static void Screen_fault_handler(int, struct sigcontext scs)
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{
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D(bug("Screen_fault_handler: ADDR=0x%08X from IP=0x%08X\n", scs.cr2, scs.eip));
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do_handle_screen_fault((uintptr)scs.cr2);
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do_handle_screen_fault((uintptr)scs.cr2, (uintptr)scs.eip);
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}
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# elif defined(__m68k__) && defined(__NetBSD__)
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@ -342,20 +354,12 @@ static inline void update_display_window_vosf(void)
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{
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int page = 0;
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for (;;) {
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while (PFLAG_ISCLEAR_4(page))
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page += 4;
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while (PFLAG_ISCLEAR(page))
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page++;
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if (page >= mainBuffer.pageCount)
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const int first_page = find_next_page_set(page);
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if (first_page >= mainBuffer.pageCount)
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break;
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const int first_page = page;
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while ((page < mainBuffer.pageCount) && PFLAG_ISSET(page)) {
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PFLAG_CLEAR(page);
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++page;
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}
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page = find_next_page_clear(first_page);
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PFLAG_CLEAR_RANGE(first_page, page);
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// Make the dirty pages read-only again
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const int32 offset = first_page << mainBuffer.pageBits;
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@ -465,21 +469,13 @@ static inline void update_display_dga_vosf(void)
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{
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int page = 0;
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for (;;) {
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while (PFLAG_ISCLEAR_4(page))
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page += 4;
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while (PFLAG_ISCLEAR(page))
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page++;
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if (page >= mainBuffer.pageCount)
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const int first_page = find_next_page_set(page);
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if (first_page >= mainBuffer.pageCount)
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break;
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const int first_page = page;
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while ((page < mainBuffer.pageCount) && PFLAG_ISSET(page)) {
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PFLAG_CLEAR(page);
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++page;
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}
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page = find_next_page_clear(first_page);
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PFLAG_CLEAR_RANGE(first_page, page);
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// Make the dirty pages read-only again
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const int32 offset = first_page << mainBuffer.pageBits;
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const uint32 length = (page - first_page) << mainBuffer.pageBits;
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