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root/cebix/BasiliskII/src/Unix/Darwin/lowmem.c

Comparing BasiliskII/src/Unix/Darwin/lowmem.c (file contents):
Revision 1.3 by gbeauche, 2005-01-30T21:42:14Z vs.
Revision 1.6 by asvitkine, 2009-11-13T01:57:48Z

#	Line 25 | Line 25
25		#include <fcntl.h>
26		#include <errno.h>
27		#include <stdio.h>
28	+	#include <stdlib.h>
29		#include <string.h>
30		#include <mach/vm_prot.h>
31		#include <mach-o/loader.h>
32	+	#include <mach-o/fat.h>
33
34		static const char progname[] = "lowmem";
35	+	static const char *filename;
36	+
37	+	static int do_swap = 0;
38	+
39	+	static uint32_t target_uint32(uint32_t value)
40	+	{
41	+	if (do_swap)
42	+	value = OSSwapInt32(value);
43	+	return value;
44	+	}
45	+
46	+	void pagezero_32(struct mach_header *machhead)
47	+	{
48	+	struct segment_command *sc_cmd;
49	+
50	+	if (target_uint32(machhead->filetype) != MH_EXECUTE) {
51	+	(void)fprintf(stderr, "%s: %s does not appear to be an executable file\n",
52	+	progname, filename);
53	+	exit(1);
54	+	}
55	+	if (machhead->ncmds == 0) {
56	+	(void)fprintf(stderr, "%s: %s does not contain any load commands\n",
57	+	progname, filename);
58	+	exit(1);
59	+	}
60	+	sc_cmd = (void *)&machhead[1];
61	+	if (target_uint32(sc_cmd->cmd) != LC_SEGMENT){
62	+	(void)fprintf(stderr, "%s: load segment not first command in %s\n",
63	+	progname, filename);
64	+	exit(1);
65	+	}
66	+	if (strncmp(sc_cmd->segname, "__PAGEZERO", sizeof (*sc_cmd->segname))) {
67	+	(void)fprintf(stderr, "%s: zero page not first segment in %s\n",
68	+	progname, filename);
69	+	exit(1);
70	+	}
71	+	/* change the permissions */
72	+	sc_cmd->maxprot = target_uint32(VM_PROT_ALL);
73	+	sc_cmd->initprot = target_uint32(VM_PROT_ALL);
74	+	}
75	+
76	+	#if defined(MH_MAGIC_64)
77	+	void pagezero_64(struct mach_header_64 *machhead)
78	+	{
79	+	struct segment_command_64 *sc_cmd;
80	+
81	+	if (target_uint32(machhead->filetype) != MH_EXECUTE) {
82	+	(void)fprintf(stderr, "%s: %s does not appear to be an executable file\n",
83	+	progname, filename);
84	+	exit(1);
85	+	}
86	+	if (machhead->ncmds == 0) {
87	+	(void)fprintf(stderr, "%s: %s does not contain any load commands\n",
88	+	progname, filename);
89	+	exit(1);
90	+	}
91	+	sc_cmd = (void *)&machhead[1];
92	+	if (target_uint32(sc_cmd->cmd) != LC_SEGMENT_64) {
93	+	(void)fprintf(stderr, "%s: load segment not first command in %s\n",
94	+	progname, filename);
95	+	exit(1);
96	+	}
97	+	if (strncmp(sc_cmd->segname, "__PAGEZERO", sizeof(*sc_cmd->segname))) {
98	+	(void)fprintf(stderr, "%s: zero page not first segment in %s\n",
99	+	progname, filename);
100	+	exit(1);
101	+	}
102	+	/* change the permissions */
103	+	sc_cmd->maxprot = target_uint32(VM_PROT_ALL);
104	+	sc_cmd->initprot = target_uint32(VM_PROT_ALL);
105	+	}
106	+	#endif
107
108		/*
109	+	/*
110		* Under Mach there is very little assumed about the memory map of object
111		* files. It is the job of the loader to create the initial memory map of an
112		* executable. In a Mach-O executable there will be numerous loader commands
#	Line 54 | Line 129 | main(int argc, const char *argv[])
129		{
130		int fd;
131		char *addr;
132	+	off_t file_size;
133		struct mach_header *machhead;
134	<	struct segment_command *sc_cmd;
134	>	#if defined(MH_MAGIC_64)
135	>	struct mach_header_64 *machhead64;
136	>	#endif
137	>	struct fat_header *fathead;
138
139		if (argc != 2) {
140		(void)fprintf(stderr, "Usage: %s executable\n", progname);
141		exit(1);
142		}
143
144	<	fd = open(argv[1], O_RDWR, 0);
144	>	filename = argv[1];
145	>
146	>	fd = open(filename, O_RDWR, 0);
147		if (fd == -1) {
148		(void)fprintf(stderr, "%s: could not open %s: %s\n",
149	<	progname, argv[1], strerror(errno));
149	>	progname, filename, strerror(errno));
150	>	exit(1);
151	>	}
152	>
153	>	file_size = lseek(fd, 0, SEEK_END);
154	>	if (file_size == -1) {
155	>	// for some mysterious reason, this sometimes fails...
156	>	file_size = 0x1000;
157	>	#if 0
158	>	(void)fprintf(stderr, "%s: could not get size of %s: %s\n",
159	>	progname, filename, strerror(errno));
160		exit(1);
161	+	#endif
162		}
163
164		/*
165		* Size does not really matter, it will be rounded-up to a multiple
166		* of the page size automatically.
167		*/
168	<	addr = mmap(NULL, 0x1000, PROT_READ | PROT_WRITE,
168	>	addr = mmap(NULL, file_size, PROT_READ | PROT_WRITE,
169		MAP_FILE | MAP_SHARED, fd, 0);
170		if (addr == NULL) {
171		(void)fprintf(stderr, "%s: could not mmap %s: %s\n",
172	<	progname, argv[1], strerror(errno));
172	>	progname, filename, strerror(errno));
173		exit(1);
174		}
175
176		/*
177		* Check to see if the Mach-O magic bytes are in the header.
86	–	* If we cared about cross compiling we would also check against
87	–	* MH_CIGAM and then change the endianness with every access, but
88	–	* we do not care about that.
178		*/
179		machhead = (void *)addr;
180	<	if (machhead->magic != MH_MAGIC) {
180	>	#if defined(MH_MAGIC_64)
181	>	machhead64 = (void *)addr;
182	>	#endif
183	>	fathead = (void *)addr;
184	>
185	>	#if defined(MH_MAGIC_64)
186	>	do_swap = machhead->magic == MH_CIGAM || fathead->magic == FAT_CIGAM || machhead64->magic == MH_CIGAM_64;
187	>	#else
188	>	do_swap = machhead->magic == MH_CIGAM || fathead->magic == FAT_CIGAM;
189	>	#endif
190	>
191	>	if (target_uint32(machhead->magic) == MH_MAGIC) {
192	>	pagezero_32(machhead);
193	>	#if defined(MH_MAGIC_64)
194	>	} else if (target_uint32(machhead64->magic) == MH_MAGIC_64) {
195	>	pagezero_64(machhead64);
196	>	#endif
197	>	} else if (target_uint32(fathead->magic) == FAT_MAGIC) {
198	>	struct fat_arch *arch = (void *)&fathead[1];
199	>	int saved_swap = do_swap;
200	>	int i;
201	>	for (i = 0; i < target_uint32(fathead->nfat_arch); ++i, ++arch) {
202	>	machhead   = (void *)(addr + target_uint32(arch->offset));
203	>	#if defined(MH_MAGIC_64)
204	>	machhead64 = (void *)(addr + target_uint32(arch->offset));
205	>	#endif
206	>	#if defined(MH_MAGIC_64)
207	>	do_swap = machhead->magic == MH_CIGAM || machhead64->magic == MH_CIGAM_64;
208	>	#else
209	>	do_swap = machhead->magic == MH_CIGAM;
210	>	#endif
211	>	if (target_uint32(machhead->magic) == MH_MAGIC) {
212	>	pagezero_32(machhead);
213	>	#if defined(MH_MAGIC_64)
214	>	} else if (target_uint32(machhead64->magic) == MH_MAGIC_64) {
215	>	pagezero_64(machhead64);
216	>	#endif
217	>	} else {
218	>	(void)fprintf(stderr, "%s: %s does not appear to be a Mach-O object file\n",
219	>	progname, filename);
220	>	exit(1);
221	>	}
222	>	do_swap = saved_swap;
223	>	}
224	>	} else {
225		(void)fprintf(stderr, "%s: %s does not appear to be a Mach-O object file\n",
226	<	progname, argv[1]);
94	<	exit(1);
95	<	}
96	<
97	<	if (machhead->filetype != MH_EXECUTE) {
98	<	(void)fprintf(stderr, "%s: %s does not appear to be an executable file\n",
99	<	progname, argv[1]);
226	>	progname, filename);
227		exit(1);
228		}
229
103	–	if (machhead->ncmds == 0) {
104	–	(void)fprintf(stderr, "%s: %s does not contain any load commands\n",
105	–	progname, argv[1]);
106	–	exit(1);
107	–	}
108	–
109	–	sc_cmd = (void *)&machhead[1];
110	–	if (sc_cmd->cmd != LC_SEGMENT){
111	–	(void)fprintf(stderr, "%s: load segment not first command in %s\n",
112	–	progname, argv[1]);
113	–	exit(1);
114	–	}
115	–
116	–	if (strncmp(sc_cmd->segname, "__PAGEZERO",
117	–	sizeof (*sc_cmd->segname))) {
118	–	(void)fprintf(stderr, "%s: zero page not first segment in %s\n",
119	–	progname, argv[1]);
120	–	exit(1);
121	–	}
122	–
123	–	/* change the permissions */
124	–	sc_cmd->maxprot = VM_PROT_ALL;
125	–	sc_cmd->initprot = VM_PROT_ALL;
126	–
230		/*
231		* We do not make __PAGEZERO 8K in this program because then
232		* all of the offsets would be wrong in the object file after
233		* this segment. Instead we use the -pagezero_size option
234		* to link the executable.
235		*/
236	<	if (msync(addr, 0x1000, MS_SYNC) == -1) {
236	>	if (msync(addr, file_size, MS_SYNC) == -1) {
237		(void)fprintf(stderr, "%s: could not sync %s: %s\n",
238	<	progname, argv[1], strerror(errno));
238	>	progname, filename, strerror(errno));
239		exit(1);
240		}
241
242	<	if (munmap(addr, 0x1000) == -1) {
242	>	if (munmap(addr, file_size) == -1) {
243		(void)fprintf(stderr, "%s: could not unmap %s: %s\n",
244	<	progname, argv[1], strerror(errno));
244	>	progname, filename, strerror(errno));
245		exit(1);
246		}
247

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