mirror of
https://github.com/OpenRCT2/OpenRCT2
synced 2026-01-04 13:42:55 +01:00
refactor RCT2 PE setup.
This commit is contained in:
IntelOrca
201
src/openrct2.c
201
src/openrct2.c
@@ -65,6 +65,8 @@ int _finished;
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static struct { sint16 x, y, z; } _spritelocations1[MAX_SPRITES], _spritelocations2[MAX_SPRITES];
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static void openrct2_loop();
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static bool openrct2_setup_rct2_segment();
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static void openrct2_setup_rct2_hooks();
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static void openrct2_copy_files_over(const utf8 *originalDirectory, const utf8 *newDirectory, const utf8 *extension)
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{
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@@ -184,86 +186,11 @@ bool openrct2_initialise()
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return false;
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}
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#ifdef __linux__
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#define DATA_OFFSET 0x004A4000
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const char *exepath = "../openrct2.exe";
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int fd = open(exepath, O_RDONLY);
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if (fd < 0) {
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log_fatal("failed to open %s, errno = %d", exepath, errno);
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exit(1);
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if (!openrct2_setup_rct2_segment()) {
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log_fatal("Unable to load RCT2 data sector");
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return false;
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}
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// Using PE-bear I was able to figure out all the needed addresses to be filled.
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// There are three sections to be loaded: .rdata, .data and .text, plus another
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// one to be mapped: DATASEG.
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// Out of the three, two can simply be mmapped into memory, while the third one,
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// .data has a virtual size which is much completely different to its file size
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// (even when taking page-alignment into consideration)
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//
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// The sections are as follows (dump from gdb)
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// [0] 0x401000->0x6f7000 at 0x00001000: .text ALLOC LOAD READONLY CODE HAS_CONTENTS
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// [1] 0x6f7000->0x8a325d at 0x002f7000: CODESEG ALLOC LOAD READONLY CODE HAS_CONTENTS
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// [2] 0x8a4000->0x9a5894 at 0x004a4000: .rdata ALLOC LOAD DATA HAS_CONTENTS
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// [3] 0x9a6000->0x9e2000 at 0x005a6000: .data ALLOC LOAD DATA HAS_CONTENTS
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// [4] 0x1428000->0x14282bc at 0x005e2000: DATASEG ALLOC LOAD DATA HAS_CONTENTS
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// [5] 0x1429000->0x1452000 at 0x005e3000: .cms_t ALLOC LOAD READONLY CODE HAS_CONTENTS
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// [6] 0x1452000->0x14aaf3e at 0x0060c000: .cms_d ALLOC LOAD DATA HAS_CONTENTS
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// [7] 0x14ab000->0x14ac58a at 0x00665000: .idata ALLOC LOAD READONLY DATA HAS_CONTENTS
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// [8] 0x14ad000->0x14b512f at 0x00667000: .rsrc ALLOC LOAD DATA HAS_CONTENTS
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//
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// .data section, however, has virtual size of 0xA81C3C, and so
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// 0x9a6000 + 0xA81C3C = 0x1427C3C, which after alignment to page size becomes
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// 0x1428000, which can be seen as next section, DATASEG
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//
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// Since mmap does not provide a way to create a mapping with virtual size,
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// I resorted to creating a one large map for data and memcpy'ing data where
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// required.
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// Another section is needed for .text, as it requires PROT_EXEC flag.
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// TODO: UGLY, UGLY HACK!
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off_t file_size = 6750208;
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int len = 0x01429000 - 0x8a4000; // 0xB85000, 12079104 bytes or around 11.5MB
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// section: rw data
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void *base = mmap((void *)0x8a4000, len, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, 0, 0);
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log_warning("base = %x, 0x01423b40 >= base == %i, 0x01423b40 < base + len == %i", base, (void *)0x01423b40 >= base, (void *)0x01423b40 < base + len);
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if (base == MAP_FAILED) {
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log_warning("errno = %i", errno);
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exit(1);
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}
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len = 0x004A3000;
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// section: text
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void *base2 = mmap((void *)(0x401000), len, PROT_EXEC | PROT_WRITE | PROT_READ, MAP_PRIVATE, fd, 0x1000);
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if (base2 != (void *)(0x401000))
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{
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log_fatal("mmap failed to get required offset! got %p, expected %p, errno = %d", base2, (void *)(0x401000), errno);
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exit(1);
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}
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void *fbase = mmap(NULL, file_size, PROT_READ, MAP_PRIVATE, fd, 0);
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int err = errno;
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log_warning("mmapped file to %p", fbase);
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if (fbase == MAP_FAILED)
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{
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log_fatal("mmap failed to get required offset! got %p, errno = %d", fbase, err);
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exit(1);
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}
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// .rdata and real part of .data
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// 0x9e2000 - 0x8a4000 = 0x13e000
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memcpy(base, fbase + DATA_OFFSET, 0x13e000);
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#endif // __linux__
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const uint32 c1 = sawyercoding_calculate_checksum((void *)0x009ACFA4, 128);
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const uint32 c2 = sawyercoding_calculate_checksum((void *)0x009ACFA4, 720 * 4);
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const uint32 exp_c1 = 32640;
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const uint32 exp_c2 = 734400;
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log_warning("c1 = %u, expected %u, match %d", c1, exp_c1, c1 == exp_c1);
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log_warning("c1 = %u, expected %u, match %d", c2, exp_c2, c2 == exp_c2);
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if (c1 != exp_c1 || c2 != exp_c2)
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{
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exit(1);
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}
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openrct2_set_exe_path();
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config_set_defaults();
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@@ -300,15 +227,7 @@ bool openrct2_initialise()
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title_sequences_set_default();
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title_sequences_load_presets();
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// Hooks to allow RCT2 to call OpenRCT2 functions instead
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addhook(0x006E732D, (int)gfx_set_dirty_blocks, 0, (int[]){ EAX, EBX, EDX, EBP, END }, 0, 0); // remove when all callers are decompiled
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addhook(0x006E7499, (int)gfx_redraw_screen_rect, 0, (int[]){ EAX, EBX, EDX, EBP, END }, 0, 0); // remove when 0x6E7FF3 is decompiled
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addhook(0x006B752C, (int)ride_crash, 0, (int[]){ EDX, EBX, END }, 0, 0); // remove when all callers are decompiled
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addhook(0x0069A42F, (int)peep_window_state_update, 0, (int[]){ ESI, END }, 0, 0); // remove when all callers are decompiled
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addhook(0x006BB76E, (int)sound_play_panned, 0, (int[]){EAX, EBX, ECX, EDX, EBP, END}, EAX, 0); // remove when all callers are decompiled
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addhook(0x006C42D9, (int)scrolling_text_setup, 0, (int[]){EAX, ECX, EBP, END}, 0, EBX); // remove when all callers are decompiled
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addhook(0x006C2321, (int)gfx_get_string_width, 0, (int[]){ESI, END}, 0, ECX); // remove when all callers are decompiled
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addhook(0x006C2555, (int)format_string, 0, (int[]){EDI, EAX, ECX, END}, 0, 0); // remove when all callers are decompiled
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openrct2_setup_rct2_hooks();
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if (!rct2_init())
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return false;
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@@ -529,6 +448,114 @@ void openrct2_reset_object_tween_locations()
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}
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}
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/**
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* Loads RCT2's data model and remaps the addresses.
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* @returns true if the data integrity check succeeded, otherwise false.
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*/
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static bool openrct2_setup_rct2_segment()
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{
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// Linux will run OpenRCT2 as a native application and then load in the Windows PE, mapping the appropriate addresses as
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// necessary. Windows does not need to do this as OpenRCT2 runs as a DLL loaded from the Windows PE.
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#ifdef __linux__
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#define DATA_OFFSET 0x004A4000
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const char *exepath = "../openrct2.exe";
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int fd = open(exepath, O_RDONLY);
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if (fd < 0) {
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log_fatal("failed to open %s, errno = %d", exepath, errno);
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exit(1);
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}
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// Using PE-bear I was able to figure out all the needed addresses to be filled.
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// There are three sections to be loaded: .rdata, .data and .text, plus another
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// one to be mapped: DATASEG.
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// Out of the three, two can simply be mmapped into memory, while the third one,
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// .data has a virtual size which is much completely different to its file size
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// (even when taking page-alignment into consideration)
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//
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// The sections are as follows (dump from gdb)
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// [0] 0x401000->0x6f7000 at 0x00001000: .text ALLOC LOAD READONLY CODE HAS_CONTENTS
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// [1] 0x6f7000->0x8a325d at 0x002f7000: CODESEG ALLOC LOAD READONLY CODE HAS_CONTENTS
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// [2] 0x8a4000->0x9a5894 at 0x004a4000: .rdata ALLOC LOAD DATA HAS_CONTENTS
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// [3] 0x9a6000->0x9e2000 at 0x005a6000: .data ALLOC LOAD DATA HAS_CONTENTS
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// [4] 0x1428000->0x14282bc at 0x005e2000: DATASEG ALLOC LOAD DATA HAS_CONTENTS
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// [5] 0x1429000->0x1452000 at 0x005e3000: .cms_t ALLOC LOAD READONLY CODE HAS_CONTENTS
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// [6] 0x1452000->0x14aaf3e at 0x0060c000: .cms_d ALLOC LOAD DATA HAS_CONTENTS
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// [7] 0x14ab000->0x14ac58a at 0x00665000: .idata ALLOC LOAD READONLY DATA HAS_CONTENTS
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// [8] 0x14ad000->0x14b512f at 0x00667000: .rsrc ALLOC LOAD DATA HAS_CONTENTS
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//
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// .data section, however, has virtual size of 0xA81C3C, and so
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// 0x9a6000 + 0xA81C3C = 0x1427C3C, which after alignment to page size becomes
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// 0x1428000, which can be seen as next section, DATASEG
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//
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// Since mmap does not provide a way to create a mapping with virtual size,
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// I resorted to creating a one large map for data and memcpy'ing data where
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// required.
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// Another section is needed for .text, as it requires PROT_EXEC flag.
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// TODO: UGLY, UGLY HACK!
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off_t file_size = 6750208;
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int len = 0x01429000 - 0x8a4000; // 0xB85000, 12079104 bytes or around 11.5MB
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// section: rw data
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void *base = mmap((void *)0x8a4000, len, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, 0, 0);
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log_warning("base = %x, 0x01423b40 >= base == %i, 0x01423b40 < base + len == %i", base, (void *)0x01423b40 >= base, (void *)0x01423b40 < base + len);
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if (base == MAP_FAILED) {
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log_warning("errno = %i", errno);
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exit(1);
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}
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len = 0x004A3000;
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// section: text
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void *base2 = mmap((void *)(0x401000), len, PROT_EXEC | PROT_WRITE | PROT_READ, MAP_PRIVATE, fd, 0x1000);
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if (base2 != (void *)(0x401000))
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{
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log_fatal("mmap failed to get required offset! got %p, expected %p, errno = %d", base2, (void *)(0x401000), errno);
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exit(1);
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}
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void *fbase = mmap(NULL, file_size, PROT_READ, MAP_PRIVATE, fd, 0);
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int err = errno;
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log_warning("mmapped file to %p", fbase);
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if (fbase == MAP_FAILED)
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{
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log_fatal("mmap failed to get required offset! got %p, errno = %d", fbase, err);
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exit(1);
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}
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// .rdata and real part of .data
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// 0x9e2000 - 0x8a4000 = 0x13e000
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memcpy(base, fbase + DATA_OFFSET, 0x13e000);
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#endif // __linux__
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// Check that the expected data is at various addresses.
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const uint32 c1 = sawyercoding_calculate_checksum((void *)0x009ACFA4, 128);
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const uint32 c2 = sawyercoding_calculate_checksum((void *)0x009ACFA4, 720 * 4);
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const uint32 exp_c1 = 32640;
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const uint32 exp_c2 = 734400;
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if (c1 != exp_c1 || c2 != exp_c2) {
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log_warning("c1 = %u, expected %u, match %d", c1, exp_c1, c1 == exp_c1);
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log_warning("c1 = %u, expected %u, match %d", c2, exp_c2, c2 == exp_c2);
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return false;
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}
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return true;
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}
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/**
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* Setup hooks to allow RCT2 to call OpenRCT2 functions instead.
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*/
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static void openrct2_setup_rct2_hooks()
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{
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addhook(0x006E732D, (int)gfx_set_dirty_blocks, 0, (int[]){ EAX, EBX, EDX, EBP, END }, 0, 0); // remove when all callers are decompiled
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addhook(0x006E7499, (int)gfx_redraw_screen_rect, 0, (int[]){ EAX, EBX, EDX, EBP, END }, 0, 0); // remove when 0x6E7FF3 is decompiled
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addhook(0x006B752C, (int)ride_crash, 0, (int[]){ EDX, EBX, END }, 0, 0); // remove when all callers are decompiled
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addhook(0x0069A42F, (int)peep_window_state_update, 0, (int[]){ ESI, END }, 0, 0); // remove when all callers are decompiled
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addhook(0x006BB76E, (int)sound_play_panned, 0, (int[]){EAX, EBX, ECX, EDX, EBP, END}, EAX, 0); // remove when all callers are decompiled
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addhook(0x006C42D9, (int)scrolling_text_setup, 0, (int[]){EAX, ECX, EBP, END}, 0, EBX); // remove when all callers are decompiled
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addhook(0x006C2321, (int)gfx_get_string_width, 0, (int[]){ESI, END}, 0, ECX); // remove when all callers are decompiled
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addhook(0x006C2555, (int)format_string, 0, (int[]){EDI, EAX, ECX, END}, 0, 0); // remove when all callers are decompiled
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}
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#if _MSC_VER >= 1900
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/**
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* Temporary fix for libraries not compiled with VS2015
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