2 * GINGE - GINGE Is Not Gp2x Emulator
5 * This work is licensed under the MAME license, see COPYING file for details.
11 #include <sys/types.h>
17 #include "realfuncs.h"
22 #define CHECK_(val, fail_operator, expect, err_msg) \
23 if (val fail_operator expect) { \
24 fprintf(stderr, err_msg ", exiting (%d)\n", (int)(long)val); \
28 #define CHECK_EQ(val, expect, err_msg) \
29 CHECK_(val, !=, expect, err_msg)
31 #define CHECK_NE(val, expect, err_msg) \
32 CHECK_(val, ==, expect, err_msg)
34 #define HDR_CHECK_EQ(field, expect, err_msg) \
35 CHECK_(hdr.field, !=, expect, err_msg)
37 #define HDR_CHECK_NE(field, expect, err_msg) \
38 CHECK_(hdr.field, ==, expect, err_msg)
40 #define FAIL_PERROR(msg) { \
50 static int is_range_used(maps_range *maps, int map_cnt, unsigned long start, unsigned long end)
53 for (i = 0; i < map_cnt; i++) {
54 if (maps[i].end <= start)
56 if (end <= maps[i].start)
65 extern char **environ;
67 int main(int argc, char *argv[])
69 void *lowest_segment = (void *)-1;
75 int i, ret, envc, sfp;
81 fprintf(stderr, "usage: %s <program> [args]\n", argv[0]);
87 fi = fopen("/proc/self/maps", "r");
88 CHECK_NE(fi, NULL, "fopen maps");
90 for (i = 0; i < ARRAY_SIZE(maps); i++) {
91 ret = fscanf(fi, "%lx-%lx %*s %*s %*s %*s %*s\n", &maps[i].start, &maps[i].end);
94 CHECK_EQ(ret, 2, "maps parse error");
98 CHECK_NE(map_cnt, 0, "no maps");
99 CHECK_NE(map_cnt, ARRAY_SIZE(maps), "too many maps");
101 fi = fopen(argv[1], "rb");
103 FAIL_PERROR("fopen");
105 if (fread(&hdr, 1, sizeof(hdr), fi) != sizeof(hdr))
106 FAIL_PERROR("too small or");
108 if (memcmp(hdr.e_ident, ELFMAG "\x01\x01", SELFMAG + 2) != 0) {
109 fprintf(stderr, "not 32bit LE ELF?\n");
113 HDR_CHECK_EQ(e_type, ET_EXEC, "not executable");
114 HDR_CHECK_EQ(e_machine, EM_ARM, "not ARM");
115 HDR_CHECK_EQ(e_phentsize, sizeof(Elf32_Phdr), "bad PH entry size");
116 HDR_CHECK_NE(e_phnum, 0, "no PH entries");
118 phdr = malloc(hdr.e_phnum * hdr.e_phentsize);
119 CHECK_NE(phdr, NULL, "OOM");
121 if (fread(phdr, hdr.e_phentsize, hdr.e_phnum, fi) != hdr.e_phnum)
122 FAIL_PERROR("too small or");
124 for (i = 0; i < hdr.e_phnum; i++) {
125 Elf32_Addr end_addr = phdr[i].p_vaddr + phdr[i].p_memsz;
129 if (phdr[i].p_type == PT_NOTE)
131 if (phdr[i].p_type != PT_LOAD) {
132 fprintf(stderr, "skipping section %d\n", phdr[i].p_type);
136 ret = is_range_used(maps, map_cnt, phdr[i].p_vaddr, end_addr);
138 fprintf(stderr, "segment %d (%08x-%08x) hits %08lx-%08lx in maps\n",
139 i, phdr[i].p_vaddr, end_addr, maps[ret - 1].start, maps[ret - 1].end);
143 log("load %d %08x-%08x from %08x\n", phdr[i].p_type,
144 phdr[i].p_vaddr, end_addr, phdr[i].p_offset);
146 align = phdr[i].p_vaddr & 0xfff;
147 map_ptr = (void *)(phdr[i].p_vaddr - align);
148 ptr = mmap(map_ptr, phdr[i].p_memsz + align, PROT_READ|PROT_WRITE|PROT_EXEC,
149 MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
150 if (ptr == MAP_FAILED || ptr != map_ptr)
153 if (phdr[i].p_filesz > 0) {
154 if (fseek(fi, phdr[i].p_offset, SEEK_SET) != 0)
155 FAIL_PERROR("fseek");
156 if (fread((char *)ptr + align, 1, phdr[i].p_filesz, fi) != phdr[i].p_filesz)
157 FAIL_PERROR("too small or");
159 if (phdr[i].p_flags & PF_X)
160 do_patches((char *)ptr + align, phdr[i].p_filesz);
163 if (map_ptr < lowest_segment)
164 lowest_segment = map_ptr;
167 // build self bin path
168 snprintf(buf, sizeof(buf), "/proc/self/fd/%d", fileno(fi));
169 if (lstat(buf, &st) != 0)
170 FAIL_PERROR("lstat bin_path");
171 bin_path = malloc(st.st_size + 1);
172 CHECK_NE(bin_path, NULL, "bin_path");
173 ret = readlink(buf, bin_path, st.st_size);
175 FAIL_PERROR("readlink");
180 emu_init(lowest_segment);
182 // generate stack frame: argc, argv[], NULL, env[], NULL
183 for (envc = 0; environ[envc] != NULL; envc++)
186 stack_frame = calloc(argc + envc + 3, sizeof(stack_frame[0]));
187 if (stack_frame == NULL) {
188 fprintf(stderr, "stack_frame OOM\n");
192 // update the environment
193 setenv("_", bin_path, 1);
196 stack_frame[sfp++] = argc - 1;
197 for (i = 1; i < argc; i++)
198 stack_frame[sfp++] = (long)argv[i];
199 stack_frame[sfp++] = 0;
200 for (i = 0; i < envc; i++)
201 stack_frame[sfp++] = (long)environ[i];
202 stack_frame[sfp++] = 0;
204 log("entering %08x, %d stack entries\n", hdr.e_entry, sfp);
205 do_entry(hdr.e_entry, stack_frame, sfp, NULL);
207 fprintf(stderr, "do_entry failed!\n");
211 // vim:shiftwidth=2:expandtab