499bf01c |
1 | /* |
2 | * GINGE - GINGE Is Not Gp2x Emulator |
3 | * (C) notaz, 2010-2011 |
4 | * |
5 | * This work is licensed under the MAME license, see COPYING file for details. |
6 | */ |
55fe8e70 |
7 | #include <stdio.h> |
8 | #include <stdlib.h> |
9 | #include <string.h> |
10 | #include <elf.h> |
c3831532 |
11 | #include <sys/types.h> |
12 | #include <sys/stat.h> |
13 | #include <unistd.h> |
55fe8e70 |
14 | #include <sys/mman.h> |
15 | |
11913091 |
16 | #include "header.h" |
7fd42181 |
17 | #include "realfuncs.h" |
11913091 |
18 | |
c3831532 |
19 | char *bin_path; |
20 | |
55fe8e70 |
21 | #define CHECK_(val, fail_operator, expect, err_msg) \ |
22 | if (val fail_operator expect) { \ |
23 | fprintf(stderr, err_msg ", exiting (%d)\n", (int)(long)val); \ |
24 | return 1; \ |
25 | } |
26 | |
27 | #define CHECK_EQ(val, expect, err_msg) \ |
28 | CHECK_(val, !=, expect, err_msg) |
29 | |
30 | #define CHECK_NE(val, expect, err_msg) \ |
31 | CHECK_(val, ==, expect, err_msg) |
32 | |
33 | #define HDR_CHECK_EQ(field, expect, err_msg) \ |
34 | CHECK_(hdr.field, !=, expect, err_msg) |
35 | |
36 | #define HDR_CHECK_NE(field, expect, err_msg) \ |
37 | CHECK_(hdr.field, ==, expect, err_msg) |
38 | |
39 | #define FAIL_PERROR(msg) { \ |
40 | perror(msg); \ |
41 | return 1; \ |
42 | } |
43 | |
55fe8e70 |
44 | typedef struct { |
45 | unsigned long start; |
46 | unsigned long end; |
47 | } maps_range; |
48 | |
49 | static int is_range_used(maps_range *maps, int map_cnt, unsigned long start, unsigned long end) |
50 | { |
51 | int i; |
52 | for (i = 0; i < map_cnt; i++) { |
53 | if (maps[i].end <= start) |
54 | continue; |
55 | if (end <= maps[i].start) |
56 | continue; |
57 | |
58 | return i + 1; |
59 | } |
60 | |
61 | return 0; |
62 | } |
63 | |
64 | extern char **environ; |
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65 | |
66 | int main(int argc, char *argv[]) |
67 | { |
11913091 |
68 | void *lowest_segment = (void *)-1; |
55fe8e70 |
69 | Elf32_Ehdr hdr; |
70 | Elf32_Phdr *phdr; |
71 | FILE *fi; |
72 | maps_range maps[16]; |
73 | int map_cnt; |
306e06f7 |
74 | int i, ret, envc, sfp; |
75 | long *stack_frame; |
c3831532 |
76 | struct stat st; |
77 | char buf[64]; |
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78 | |
306e06f7 |
79 | if (argc < 2) { |
80 | fprintf(stderr, "usage: %s <program> [args]\n", argv[0]); |
55fe8e70 |
81 | return 1; |
82 | } |
83 | |
84 | fi = fopen("/proc/self/maps", "r"); |
85 | CHECK_NE(fi, NULL, "fopen maps"); |
86 | |
87 | for (i = 0; i < ARRAY_SIZE(maps); i++) { |
88 | ret = fscanf(fi, "%lx-%lx %*s %*s %*s %*s %*s\n", &maps[i].start, &maps[i].end); |
7fd42181 |
89 | if (ret <= 0) |
55fe8e70 |
90 | break; |
91 | CHECK_EQ(ret, 2, "maps parse error"); |
92 | } |
93 | fclose(fi); |
94 | map_cnt = i; |
95 | CHECK_NE(map_cnt, 0, "no maps"); |
96 | CHECK_NE(map_cnt, ARRAY_SIZE(maps), "too many maps"); |
97 | |
98 | fi = fopen(argv[1], "rb"); |
99 | if (fi == NULL) |
100 | FAIL_PERROR("fopen"); |
101 | |
102 | if (fread(&hdr, 1, sizeof(hdr), fi) != sizeof(hdr)) |
103 | FAIL_PERROR("too small or"); |
104 | |
105 | if (memcmp(hdr.e_ident, ELFMAG "\x01\x01", SELFMAG + 2) != 0) { |
106 | fprintf(stderr, "not 32bit LE ELF?\n"); |
107 | return 1; |
108 | } |
109 | |
110 | HDR_CHECK_EQ(e_type, ET_EXEC, "not executable"); |
306e06f7 |
111 | HDR_CHECK_EQ(e_machine, EM_ARM, "not ARM"); |
55fe8e70 |
112 | HDR_CHECK_EQ(e_phentsize, sizeof(Elf32_Phdr), "bad PH entry size"); |
113 | HDR_CHECK_NE(e_phnum, 0, "no PH entries"); |
114 | |
115 | phdr = malloc(hdr.e_phnum * hdr.e_phentsize); |
116 | CHECK_NE(phdr, NULL, "OOM"); |
117 | |
118 | if (fread(phdr, hdr.e_phentsize, hdr.e_phnum, fi) != hdr.e_phnum) |
119 | FAIL_PERROR("too small or"); |
120 | |
121 | for (i = 0; i < hdr.e_phnum; i++) { |
122 | Elf32_Addr end_addr = phdr[i].p_vaddr + phdr[i].p_memsz; |
123 | Elf32_Addr align; |
124 | void *ptr, *map_ptr; |
125 | |
126 | if (phdr[i].p_type == PT_NOTE) |
127 | continue; |
128 | if (phdr[i].p_type != PT_LOAD) { |
129 | fprintf(stderr, "skipping section %d\n", phdr[i].p_type); |
130 | continue; |
131 | } |
132 | |
133 | ret = is_range_used(maps, map_cnt, phdr[i].p_vaddr, end_addr); |
134 | if (ret) { |
135 | fprintf(stderr, "segment %d (%08x-%08x) hits %08lx-%08lx in maps\n", |
136 | i, phdr[i].p_vaddr, end_addr, maps[ret - 1].start, maps[ret - 1].end); |
137 | return 1; |
138 | } |
139 | |
4d045184 |
140 | log("load %d %08x-%08x from %08x\n", phdr[i].p_type, |
55fe8e70 |
141 | phdr[i].p_vaddr, end_addr, phdr[i].p_offset); |
142 | |
143 | align = phdr[i].p_vaddr & 0xfff; |
144 | map_ptr = (void *)(phdr[i].p_vaddr - align); |
145 | ptr = mmap(map_ptr, phdr[i].p_memsz + align, PROT_READ|PROT_WRITE|PROT_EXEC, |
146 | MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); |
147 | if (ptr == MAP_FAILED || ptr != map_ptr) |
148 | FAIL_PERROR("mmap"); |
149 | |
150 | if (phdr[i].p_filesz > 0) { |
151 | if (fseek(fi, phdr[i].p_offset, SEEK_SET) != 0) |
152 | FAIL_PERROR("fseek"); |
153 | if (fread((char *)ptr + align, 1, phdr[i].p_filesz, fi) != phdr[i].p_filesz) |
154 | FAIL_PERROR("too small or"); |
11913091 |
155 | |
156 | if (phdr[i].p_flags & PF_X) |
157 | do_patches((char *)ptr + align, phdr[i].p_filesz); |
55fe8e70 |
158 | } |
11913091 |
159 | |
160 | if (map_ptr < lowest_segment) |
161 | lowest_segment = map_ptr; |
55fe8e70 |
162 | } |
163 | |
c3831532 |
164 | // build self bin path |
165 | snprintf(buf, sizeof(buf), "/proc/self/fd/%d", fileno(fi)); |
166 | if (lstat(buf, &st) != 0) |
167 | FAIL_PERROR("lstat bin_path"); |
168 | bin_path = malloc(st.st_size + 1); |
169 | CHECK_NE(bin_path, NULL, "bin_path"); |
170 | ret = readlink(buf, bin_path, st.st_size); |
171 | if (ret < 0) |
172 | FAIL_PERROR("readlink"); |
173 | bin_path[ret] = 0; |
174 | |
175 | fclose(fi); |
176 | |
11913091 |
177 | emu_init(lowest_segment); |
178 | |
306e06f7 |
179 | // generate stack frame: argc, argv[], NULL, env[], NULL |
180 | for (envc = 0; environ[envc] != NULL; envc++) |
181 | ; |
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182 | |
306e06f7 |
183 | stack_frame = calloc(argc + envc + 3, sizeof(stack_frame[0])); |
184 | if (stack_frame == NULL) { |
185 | fprintf(stderr, "stack_frame OOM\n"); |
186 | return 1; |
187 | } |
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188 | |
c3831532 |
189 | // update the environment |
190 | setenv("_", bin_path, 1); |
191 | |
306e06f7 |
192 | sfp = 0; |
193 | stack_frame[sfp++] = argc - 1; |
194 | for (i = 1; i < argc; i++) |
195 | stack_frame[sfp++] = (long)argv[i]; |
196 | stack_frame[sfp++] = 0; |
197 | for (i = 0; i < envc; i++) |
198 | stack_frame[sfp++] = (long)environ[i]; |
199 | stack_frame[sfp++] = 0; |
200 | |
4d045184 |
201 | log("entering %08x, %d stack entries\n", hdr.e_entry, sfp); |
306e06f7 |
202 | do_entry(hdr.e_entry, stack_frame, sfp, NULL); |
203 | |
204 | fprintf(stderr, "do_entry failed!\n"); |
205 | return 1; |
55fe8e70 |
206 | } |
207 | |
499bf01c |
208 | // vim:shiftwidth=2:expandtab |