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1 | 7d13299d | bellard | /*
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2 | 7d13299d | bellard | * Generic Dynamic compiler generator
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3 | 7d13299d | bellard | *
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4 | 7d13299d | bellard | * Copyright (c) 2003 Fabrice Bellard
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5 | 7d13299d | bellard | *
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6 | 7d13299d | bellard | * This program is free software; you can redistribute it and/or modify
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7 | 7d13299d | bellard | * it under the terms of the GNU General Public License as published by
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8 | 7d13299d | bellard | * the Free Software Foundation; either version 2 of the License, or
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9 | 7d13299d | bellard | * (at your option) any later version.
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10 | 7d13299d | bellard | *
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11 | 7d13299d | bellard | * This program is distributed in the hope that it will be useful,
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12 | 7d13299d | bellard | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 7d13299d | bellard | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | 7d13299d | bellard | * GNU General Public License for more details.
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15 | 7d13299d | bellard | *
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16 | 7d13299d | bellard | * You should have received a copy of the GNU General Public License
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17 | 7d13299d | bellard | * along with this program; if not, write to the Free Software
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18 | 7d13299d | bellard | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | 7d13299d | bellard | */
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20 | 367e86e8 | bellard | #include <stdlib.h> |
21 | 367e86e8 | bellard | #include <stdio.h> |
22 | 367e86e8 | bellard | #include <stdarg.h> |
23 | 367e86e8 | bellard | #include <inttypes.h> |
24 | 367e86e8 | bellard | #include <elf.h> |
25 | 367e86e8 | bellard | #include <unistd.h> |
26 | 367e86e8 | bellard | #include <fcntl.h> |
27 | 367e86e8 | bellard | |
28 | 367e86e8 | bellard | #include "thunk.h" |
29 | 367e86e8 | bellard | |
30 | 367e86e8 | bellard | /* all dynamically generated functions begin with this code */
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31 | 367e86e8 | bellard | #define OP_PREFIX "op" |
32 | 367e86e8 | bellard | |
33 | 367e86e8 | bellard | int elf_must_swap(Elf32_Ehdr *h)
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34 | 367e86e8 | bellard | { |
35 | 367e86e8 | bellard | union {
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36 | 367e86e8 | bellard | uint32_t i; |
37 | 367e86e8 | bellard | uint8_t b[4];
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38 | 367e86e8 | bellard | } swaptest; |
39 | 367e86e8 | bellard | |
40 | 367e86e8 | bellard | swaptest.i = 1;
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41 | 367e86e8 | bellard | return (h->e_ident[EI_DATA] == ELFDATA2MSB) !=
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42 | 367e86e8 | bellard | (swaptest.b[0] == 0); |
43 | 367e86e8 | bellard | } |
44 | 367e86e8 | bellard | |
45 | 367e86e8 | bellard | void swab16s(uint16_t *p)
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46 | 367e86e8 | bellard | { |
47 | 367e86e8 | bellard | *p = bswap16(*p); |
48 | 367e86e8 | bellard | } |
49 | 367e86e8 | bellard | |
50 | 367e86e8 | bellard | void swab32s(uint32_t *p)
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51 | 367e86e8 | bellard | { |
52 | 367e86e8 | bellard | *p = bswap32(*p); |
53 | 367e86e8 | bellard | } |
54 | 367e86e8 | bellard | |
55 | 367e86e8 | bellard | void swab64s(uint32_t *p)
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56 | 367e86e8 | bellard | { |
57 | 367e86e8 | bellard | *p = bswap64(*p); |
58 | 367e86e8 | bellard | } |
59 | 367e86e8 | bellard | |
60 | 367e86e8 | bellard | void elf_swap_ehdr(Elf32_Ehdr *h)
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61 | 367e86e8 | bellard | { |
62 | 367e86e8 | bellard | swab16s(&h->e_type); /* Object file type */
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63 | 367e86e8 | bellard | swab16s(&h-> e_machine); /* Architecture */
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64 | 367e86e8 | bellard | swab32s(&h-> e_version); /* Object file version */
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65 | 367e86e8 | bellard | swab32s(&h-> e_entry); /* Entry point virtual address */
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66 | 367e86e8 | bellard | swab32s(&h-> e_phoff); /* Program header table file offset */
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67 | 367e86e8 | bellard | swab32s(&h-> e_shoff); /* Section header table file offset */
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68 | 367e86e8 | bellard | swab32s(&h-> e_flags); /* Processor-specific flags */
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69 | 367e86e8 | bellard | swab16s(&h-> e_ehsize); /* ELF header size in bytes */
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70 | 367e86e8 | bellard | swab16s(&h-> e_phentsize); /* Program header table entry size */
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71 | 367e86e8 | bellard | swab16s(&h-> e_phnum); /* Program header table entry count */
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72 | 367e86e8 | bellard | swab16s(&h-> e_shentsize); /* Section header table entry size */
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73 | 367e86e8 | bellard | swab16s(&h-> e_shnum); /* Section header table entry count */
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74 | 367e86e8 | bellard | swab16s(&h-> e_shstrndx); /* Section header string table index */
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75 | 367e86e8 | bellard | } |
76 | 367e86e8 | bellard | |
77 | 367e86e8 | bellard | void elf_swap_shdr(Elf32_Shdr *h)
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78 | 367e86e8 | bellard | { |
79 | 367e86e8 | bellard | swab32s(&h-> sh_name); /* Section name (string tbl index) */
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80 | 367e86e8 | bellard | swab32s(&h-> sh_type); /* Section type */
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81 | 367e86e8 | bellard | swab32s(&h-> sh_flags); /* Section flags */
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82 | 367e86e8 | bellard | swab32s(&h-> sh_addr); /* Section virtual addr at execution */
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83 | 367e86e8 | bellard | swab32s(&h-> sh_offset); /* Section file offset */
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84 | 367e86e8 | bellard | swab32s(&h-> sh_size); /* Section size in bytes */
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85 | 367e86e8 | bellard | swab32s(&h-> sh_link); /* Link to another section */
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86 | 367e86e8 | bellard | swab32s(&h-> sh_info); /* Additional section information */
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87 | 367e86e8 | bellard | swab32s(&h-> sh_addralign); /* Section alignment */
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88 | 367e86e8 | bellard | swab32s(&h-> sh_entsize); /* Entry size if section holds table */
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89 | 367e86e8 | bellard | } |
90 | 367e86e8 | bellard | |
91 | 367e86e8 | bellard | void elf_swap_phdr(Elf32_Phdr *h)
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92 | 367e86e8 | bellard | { |
93 | 367e86e8 | bellard | swab32s(&h->p_type); /* Segment type */
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94 | 367e86e8 | bellard | swab32s(&h->p_offset); /* Segment file offset */
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95 | 367e86e8 | bellard | swab32s(&h->p_vaddr); /* Segment virtual address */
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96 | 367e86e8 | bellard | swab32s(&h->p_paddr); /* Segment physical address */
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97 | 367e86e8 | bellard | swab32s(&h->p_filesz); /* Segment size in file */
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98 | 367e86e8 | bellard | swab32s(&h->p_memsz); /* Segment size in memory */
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99 | 367e86e8 | bellard | swab32s(&h->p_flags); /* Segment flags */
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100 | 367e86e8 | bellard | swab32s(&h->p_align); /* Segment alignment */
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101 | 367e86e8 | bellard | } |
102 | 367e86e8 | bellard | |
103 | 367e86e8 | bellard | int do_swap;
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104 | 367e86e8 | bellard | int e_machine;
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105 | 367e86e8 | bellard | |
106 | 367e86e8 | bellard | uint16_t get16(uint16_t *p) |
107 | 367e86e8 | bellard | { |
108 | 367e86e8 | bellard | uint16_t val; |
109 | 367e86e8 | bellard | val = *p; |
110 | 367e86e8 | bellard | if (do_swap)
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111 | 367e86e8 | bellard | val = bswap16(val); |
112 | 367e86e8 | bellard | return val;
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113 | 367e86e8 | bellard | } |
114 | 367e86e8 | bellard | |
115 | 367e86e8 | bellard | uint32_t get32(uint32_t *p) |
116 | 367e86e8 | bellard | { |
117 | 367e86e8 | bellard | uint32_t val; |
118 | 367e86e8 | bellard | val = *p; |
119 | 367e86e8 | bellard | if (do_swap)
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120 | 367e86e8 | bellard | val = bswap32(val); |
121 | 367e86e8 | bellard | return val;
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122 | 367e86e8 | bellard | } |
123 | 367e86e8 | bellard | |
124 | 367e86e8 | bellard | void put16(uint16_t *p, uint16_t val)
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125 | 367e86e8 | bellard | { |
126 | 367e86e8 | bellard | if (do_swap)
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127 | 367e86e8 | bellard | val = bswap16(val); |
128 | 367e86e8 | bellard | *p = val; |
129 | 367e86e8 | bellard | } |
130 | 367e86e8 | bellard | |
131 | 367e86e8 | bellard | void put32(uint32_t *p, uint32_t val)
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132 | 367e86e8 | bellard | { |
133 | 367e86e8 | bellard | if (do_swap)
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134 | 367e86e8 | bellard | val = bswap32(val); |
135 | 367e86e8 | bellard | *p = val; |
136 | 367e86e8 | bellard | } |
137 | 367e86e8 | bellard | |
138 | 367e86e8 | bellard | void __attribute__((noreturn)) error(const char *fmt, ...) |
139 | 367e86e8 | bellard | { |
140 | 367e86e8 | bellard | va_list ap; |
141 | 367e86e8 | bellard | va_start(ap, fmt); |
142 | 367e86e8 | bellard | fprintf(stderr, "dyngen: ");
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143 | 367e86e8 | bellard | vfprintf(stderr, fmt, ap); |
144 | 367e86e8 | bellard | fprintf(stderr, "\n");
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145 | 367e86e8 | bellard | va_end(ap); |
146 | 367e86e8 | bellard | exit(1);
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147 | 367e86e8 | bellard | } |
148 | 367e86e8 | bellard | |
149 | 367e86e8 | bellard | |
150 | 367e86e8 | bellard | Elf32_Shdr *find_elf_section(Elf32_Shdr *shdr, int shnum, const char *shstr, |
151 | 367e86e8 | bellard | const char *name) |
152 | 367e86e8 | bellard | { |
153 | 367e86e8 | bellard | int i;
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154 | 367e86e8 | bellard | const char *shname; |
155 | 367e86e8 | bellard | Elf32_Shdr *sec; |
156 | 367e86e8 | bellard | |
157 | 367e86e8 | bellard | for(i = 0; i < shnum; i++) { |
158 | 367e86e8 | bellard | sec = &shdr[i]; |
159 | 367e86e8 | bellard | if (!sec->sh_name)
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160 | 367e86e8 | bellard | continue;
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161 | 367e86e8 | bellard | shname = shstr + sec->sh_name; |
162 | 367e86e8 | bellard | if (!strcmp(shname, name))
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163 | 367e86e8 | bellard | return sec;
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164 | 367e86e8 | bellard | } |
165 | 367e86e8 | bellard | return NULL; |
166 | 367e86e8 | bellard | } |
167 | 367e86e8 | bellard | |
168 | 367e86e8 | bellard | void *load_data(int fd, long offset, unsigned int size) |
169 | 367e86e8 | bellard | { |
170 | 367e86e8 | bellard | char *data;
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171 | 367e86e8 | bellard | |
172 | 367e86e8 | bellard | data = malloc(size); |
173 | 367e86e8 | bellard | if (!data)
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174 | 367e86e8 | bellard | return NULL; |
175 | 367e86e8 | bellard | lseek(fd, offset, SEEK_SET); |
176 | 367e86e8 | bellard | if (read(fd, data, size) != size) {
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177 | 367e86e8 | bellard | free(data); |
178 | 367e86e8 | bellard | return NULL; |
179 | 367e86e8 | bellard | } |
180 | 367e86e8 | bellard | return data;
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181 | 367e86e8 | bellard | } |
182 | 367e86e8 | bellard | |
183 | 367e86e8 | bellard | int strstart(const char *str, const char *val, const char **ptr) |
184 | 367e86e8 | bellard | { |
185 | 367e86e8 | bellard | const char *p, *q; |
186 | 367e86e8 | bellard | p = str; |
187 | 367e86e8 | bellard | q = val; |
188 | 367e86e8 | bellard | while (*q != '\0') { |
189 | 367e86e8 | bellard | if (*p != *q)
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190 | 367e86e8 | bellard | return 0; |
191 | 367e86e8 | bellard | p++; |
192 | 367e86e8 | bellard | q++; |
193 | 367e86e8 | bellard | } |
194 | 367e86e8 | bellard | if (ptr)
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195 | 367e86e8 | bellard | *ptr = p; |
196 | 367e86e8 | bellard | return 1; |
197 | 367e86e8 | bellard | } |
198 | 367e86e8 | bellard | |
199 | 367e86e8 | bellard | #define MAX_ARGS 3 |
200 | 367e86e8 | bellard | |
201 | 367e86e8 | bellard | /* generate op code */
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202 | 367e86e8 | bellard | void gen_code(const char *name, unsigned long offset, unsigned long size, |
203 | 367e86e8 | bellard | FILE *outfile, uint8_t *text, void *relocs, int nb_relocs, int reloc_sh_type, |
204 | 367e86e8 | bellard | Elf32_Sym *symtab, char *strtab)
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205 | 367e86e8 | bellard | { |
206 | 367e86e8 | bellard | int copy_size = 0; |
207 | 367e86e8 | bellard | uint8_t *p_start, *p_end; |
208 | 367e86e8 | bellard | int nb_args, i;
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209 | 367e86e8 | bellard | uint8_t args_present[MAX_ARGS]; |
210 | 367e86e8 | bellard | const char *sym_name, *p; |
211 | 367e86e8 | bellard | |
212 | 367e86e8 | bellard | /* compute exact size excluding return instruction */
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213 | 367e86e8 | bellard | p_start = text + offset; |
214 | 367e86e8 | bellard | p_end = p_start + size; |
215 | 367e86e8 | bellard | switch(e_machine) {
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216 | 367e86e8 | bellard | case EM_386:
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217 | 367e86e8 | bellard | { |
218 | 367e86e8 | bellard | uint8_t *p; |
219 | 367e86e8 | bellard | p = p_end - 1;
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220 | 367e86e8 | bellard | if (p == p_start)
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221 | 367e86e8 | bellard | error("empty code for %s", name);
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222 | 4b74fe1f | bellard | if (p[0] != 0xc3) |
223 | 4b74fe1f | bellard | error("ret expected at the end of %s", name);
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224 | 367e86e8 | bellard | copy_size = p - p_start; |
225 | 367e86e8 | bellard | } |
226 | 367e86e8 | bellard | break;
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227 | 367e86e8 | bellard | case EM_PPC:
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228 | 367e86e8 | bellard | { |
229 | 367e86e8 | bellard | uint8_t *p; |
230 | 367e86e8 | bellard | p = (void *)(p_end - 4); |
231 | 367e86e8 | bellard | /* find ret */
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232 | 367e86e8 | bellard | while (p > p_start && get32((uint32_t *)p) != 0x4e800020) |
233 | 367e86e8 | bellard | p -= 4;
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234 | 367e86e8 | bellard | /* skip double ret */
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235 | 367e86e8 | bellard | if (p > p_start && get32((uint32_t *)(p - 4)) == 0x4e800020) |
236 | 367e86e8 | bellard | p -= 4;
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237 | 367e86e8 | bellard | if (p == p_start)
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238 | 367e86e8 | bellard | error("empty code for %s", name);
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239 | 367e86e8 | bellard | copy_size = p - p_start; |
240 | 367e86e8 | bellard | } |
241 | 367e86e8 | bellard | break;
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242 | 367e86e8 | bellard | default:
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243 | 367e86e8 | bellard | error("unsupported CPU (%d)", e_machine);
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244 | 367e86e8 | bellard | } |
245 | 367e86e8 | bellard | |
246 | 367e86e8 | bellard | /* compute the number of arguments by looking at the relocations */
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247 | 367e86e8 | bellard | for(i = 0;i < MAX_ARGS; i++) |
248 | 367e86e8 | bellard | args_present[i] = 0;
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249 | 367e86e8 | bellard | |
250 | 367e86e8 | bellard | if (reloc_sh_type == SHT_REL) {
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251 | 367e86e8 | bellard | Elf32_Rel *rel; |
252 | 367e86e8 | bellard | int n;
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253 | 367e86e8 | bellard | for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
254 | 367e86e8 | bellard | if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
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255 | 367e86e8 | bellard | sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; |
256 | 367e86e8 | bellard | if (strstart(sym_name, "__op_param", &p)) { |
257 | 367e86e8 | bellard | n = strtoul(p, NULL, 10); |
258 | 367e86e8 | bellard | if (n >= MAX_ARGS)
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259 | 367e86e8 | bellard | error("too many arguments in %s", name);
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260 | 367e86e8 | bellard | args_present[n - 1] = 1; |
261 | 927f621e | bellard | } else {
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262 | 927f621e | bellard | fprintf(outfile, "extern char %s;\n", sym_name);
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263 | 367e86e8 | bellard | } |
264 | 367e86e8 | bellard | } |
265 | 367e86e8 | bellard | } |
266 | 367e86e8 | bellard | } else {
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267 | 367e86e8 | bellard | Elf32_Rela *rel; |
268 | 367e86e8 | bellard | int n;
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269 | 367e86e8 | bellard | for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
270 | 367e86e8 | bellard | if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
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271 | 367e86e8 | bellard | sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; |
272 | 367e86e8 | bellard | if (strstart(sym_name, "__op_param", &p)) { |
273 | 367e86e8 | bellard | n = strtoul(p, NULL, 10); |
274 | 367e86e8 | bellard | if (n >= MAX_ARGS)
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275 | 367e86e8 | bellard | error("too many arguments in %s", name);
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276 | 367e86e8 | bellard | args_present[n - 1] = 1; |
277 | 927f621e | bellard | } else {
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278 | 927f621e | bellard | fprintf(outfile, "extern char %s;\n", sym_name);
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279 | 367e86e8 | bellard | } |
280 | 367e86e8 | bellard | } |
281 | 367e86e8 | bellard | } |
282 | 367e86e8 | bellard | } |
283 | 367e86e8 | bellard | |
284 | 367e86e8 | bellard | nb_args = 0;
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285 | 367e86e8 | bellard | while (nb_args < MAX_ARGS && args_present[nb_args])
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286 | 367e86e8 | bellard | nb_args++; |
287 | 367e86e8 | bellard | for(i = nb_args; i < MAX_ARGS; i++) {
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288 | 367e86e8 | bellard | if (args_present[i])
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289 | 367e86e8 | bellard | error("inconsistent argument numbering in %s", name);
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290 | 367e86e8 | bellard | } |
291 | 367e86e8 | bellard | |
292 | 367e86e8 | bellard | /* output C code */
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293 | 367e86e8 | bellard | fprintf(outfile, "extern void %s();\n", name);
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294 | 367e86e8 | bellard | fprintf(outfile, "static inline void gen_%s(", name);
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295 | 367e86e8 | bellard | if (nb_args == 0) { |
296 | 367e86e8 | bellard | fprintf(outfile, "void");
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297 | 367e86e8 | bellard | } else {
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298 | 367e86e8 | bellard | for(i = 0; i < nb_args; i++) { |
299 | 367e86e8 | bellard | if (i != 0) |
300 | 367e86e8 | bellard | fprintf(outfile, ", ");
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301 | 367e86e8 | bellard | fprintf(outfile, "long param%d", i + 1); |
302 | 367e86e8 | bellard | } |
303 | 367e86e8 | bellard | } |
304 | 367e86e8 | bellard | fprintf(outfile, ")\n");
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305 | 367e86e8 | bellard | fprintf(outfile, "{\n");
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306 | 367e86e8 | bellard | fprintf(outfile, " memcpy(gen_code_ptr, &%s, %d);\n", name, copy_size);
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307 | 367e86e8 | bellard | |
308 | 367e86e8 | bellard | /* patch relocations */
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309 | 367e86e8 | bellard | switch(e_machine) {
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310 | 367e86e8 | bellard | case EM_386:
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311 | 367e86e8 | bellard | { |
312 | 367e86e8 | bellard | Elf32_Rel *rel; |
313 | 367e86e8 | bellard | char name[256]; |
314 | 367e86e8 | bellard | int type;
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315 | 367e86e8 | bellard | long addend;
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316 | 367e86e8 | bellard | for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
317 | 367e86e8 | bellard | if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
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318 | 367e86e8 | bellard | sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; |
319 | 367e86e8 | bellard | if (strstart(sym_name, "__op_param", &p)) { |
320 | 367e86e8 | bellard | snprintf(name, sizeof(name), "param%s", p); |
321 | 367e86e8 | bellard | } else {
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322 | 367e86e8 | bellard | snprintf(name, sizeof(name), "(long)(&%s)", sym_name); |
323 | 367e86e8 | bellard | } |
324 | 367e86e8 | bellard | type = ELF32_R_TYPE(rel->r_info); |
325 | 367e86e8 | bellard | addend = get32((uint32_t *)(text + rel->r_offset)); |
326 | 367e86e8 | bellard | switch(type) {
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327 | 367e86e8 | bellard | case R_386_32:
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328 | 367e86e8 | bellard | fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %ld) = %s + %ld;\n",
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329 | 367e86e8 | bellard | rel->r_offset - offset, name, addend); |
330 | 367e86e8 | bellard | break;
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331 | 367e86e8 | bellard | case R_386_PC32:
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332 | 367e86e8 | bellard | fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %ld) = %s - (long)(gen_code_ptr + %ld) + %ld;\n",
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333 | 367e86e8 | bellard | rel->r_offset - offset, name, rel->r_offset - offset, addend); |
334 | 367e86e8 | bellard | break;
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335 | 367e86e8 | bellard | default:
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336 | 367e86e8 | bellard | error("unsupported i386 relocation (%d)", type);
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337 | 367e86e8 | bellard | } |
338 | 367e86e8 | bellard | } |
339 | 367e86e8 | bellard | } |
340 | 367e86e8 | bellard | } |
341 | 367e86e8 | bellard | break;
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342 | 367e86e8 | bellard | default:
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343 | 367e86e8 | bellard | error("unsupported CPU for relocations (%d)", e_machine);
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344 | 367e86e8 | bellard | } |
345 | 367e86e8 | bellard | |
346 | 367e86e8 | bellard | |
347 | 367e86e8 | bellard | fprintf(outfile, " gen_code_ptr += %d;\n", copy_size);
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348 | 367e86e8 | bellard | fprintf(outfile, "}\n\n");
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349 | 367e86e8 | bellard | } |
350 | 367e86e8 | bellard | |
351 | 367e86e8 | bellard | /* load an elf object file */
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352 | 367e86e8 | bellard | int load_elf(const char *filename, FILE *outfile) |
353 | 367e86e8 | bellard | { |
354 | 367e86e8 | bellard | int fd;
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355 | 367e86e8 | bellard | Elf32_Ehdr ehdr; |
356 | 367e86e8 | bellard | Elf32_Shdr *sec, *shdr, *symtab_sec, *strtab_sec, *text_sec; |
357 | 367e86e8 | bellard | int i, j, nb_syms;
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358 | 367e86e8 | bellard | Elf32_Sym *symtab, *sym; |
359 | 367e86e8 | bellard | const char *cpu_name; |
360 | 367e86e8 | bellard | char *shstr, *strtab;
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361 | 367e86e8 | bellard | uint8_t *text; |
362 | 367e86e8 | bellard | void *relocs;
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363 | 367e86e8 | bellard | int nb_relocs, reloc_sh_type;
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364 | 367e86e8 | bellard | |
365 | 367e86e8 | bellard | fd = open(filename, O_RDONLY); |
366 | 367e86e8 | bellard | if (fd < 0) |
367 | 367e86e8 | bellard | error("can't open file '%s'", filename);
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368 | 367e86e8 | bellard | |
369 | 367e86e8 | bellard | /* Read ELF header. */
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370 | 367e86e8 | bellard | if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) |
371 | 367e86e8 | bellard | error("unable to read file header");
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372 | 367e86e8 | bellard | |
373 | 367e86e8 | bellard | /* Check ELF identification. */
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374 | 367e86e8 | bellard | if (ehdr.e_ident[EI_MAG0] != ELFMAG0
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375 | 367e86e8 | bellard | || ehdr.e_ident[EI_MAG1] != ELFMAG1 |
376 | 367e86e8 | bellard | || ehdr.e_ident[EI_MAG2] != ELFMAG2 |
377 | 367e86e8 | bellard | || ehdr.e_ident[EI_MAG3] != ELFMAG3 |
378 | 367e86e8 | bellard | || ehdr.e_ident[EI_CLASS] != ELFCLASS32 |
379 | 367e86e8 | bellard | || ehdr.e_ident[EI_VERSION] != EV_CURRENT) { |
380 | 367e86e8 | bellard | error("bad ELF header");
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381 | 367e86e8 | bellard | } |
382 | 367e86e8 | bellard | |
383 | 367e86e8 | bellard | do_swap = elf_must_swap(&ehdr); |
384 | 367e86e8 | bellard | if (do_swap)
|
385 | 367e86e8 | bellard | elf_swap_ehdr(&ehdr); |
386 | 367e86e8 | bellard | if (ehdr.e_type != ET_REL)
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387 | 367e86e8 | bellard | error("ELF object file expected");
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388 | 367e86e8 | bellard | if (ehdr.e_version != EV_CURRENT)
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389 | 367e86e8 | bellard | error("Invalid ELF version");
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390 | 367e86e8 | bellard | e_machine = ehdr.e_machine; |
391 | 367e86e8 | bellard | |
392 | 367e86e8 | bellard | /* read section headers */
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393 | 367e86e8 | bellard | shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(Elf32_Shdr));
|
394 | 367e86e8 | bellard | if (do_swap) {
|
395 | 367e86e8 | bellard | for(i = 0; i < ehdr.e_shnum; i++) { |
396 | 367e86e8 | bellard | elf_swap_shdr(&shdr[i]); |
397 | 367e86e8 | bellard | } |
398 | 367e86e8 | bellard | } |
399 | 367e86e8 | bellard | |
400 | 367e86e8 | bellard | sec = &shdr[ehdr.e_shstrndx]; |
401 | 367e86e8 | bellard | shstr = load_data(fd, sec->sh_offset, sec->sh_size); |
402 | 367e86e8 | bellard | |
403 | 367e86e8 | bellard | /* text section */
|
404 | 367e86e8 | bellard | |
405 | 367e86e8 | bellard | text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
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406 | 367e86e8 | bellard | if (!text_sec)
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407 | 367e86e8 | bellard | error("could not find .text section");
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408 | 367e86e8 | bellard | text = load_data(fd, text_sec->sh_offset, text_sec->sh_size); |
409 | 367e86e8 | bellard | |
410 | 367e86e8 | bellard | /* find text relocations, if any */
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411 | 367e86e8 | bellard | nb_relocs = 0;
|
412 | 367e86e8 | bellard | relocs = NULL;
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413 | 367e86e8 | bellard | reloc_sh_type = 0;
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414 | 367e86e8 | bellard | for(i = 0; i < ehdr.e_shnum; i++) { |
415 | 367e86e8 | bellard | sec = &shdr[i]; |
416 | 367e86e8 | bellard | if ((sec->sh_type == SHT_REL || sec->sh_type == SHT_RELA) &&
|
417 | 367e86e8 | bellard | sec->sh_info == (text_sec - shdr)) { |
418 | 367e86e8 | bellard | reloc_sh_type = sec->sh_type; |
419 | 367e86e8 | bellard | relocs = load_data(fd, sec->sh_offset, sec->sh_size); |
420 | 367e86e8 | bellard | nb_relocs = sec->sh_size / sec->sh_entsize; |
421 | 367e86e8 | bellard | if (do_swap) {
|
422 | 367e86e8 | bellard | if (sec->sh_type == SHT_REL) {
|
423 | 367e86e8 | bellard | Elf32_Rel *rel = relocs; |
424 | 367e86e8 | bellard | for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) { |
425 | 367e86e8 | bellard | swab32s(&rel->r_offset); |
426 | 367e86e8 | bellard | swab32s(&rel->r_info); |
427 | 367e86e8 | bellard | } |
428 | 367e86e8 | bellard | } else {
|
429 | 367e86e8 | bellard | Elf32_Rela *rel = relocs; |
430 | 367e86e8 | bellard | for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) { |
431 | 367e86e8 | bellard | swab32s(&rel->r_offset); |
432 | 367e86e8 | bellard | swab32s(&rel->r_info); |
433 | 367e86e8 | bellard | swab32s(&rel->r_addend); |
434 | 367e86e8 | bellard | } |
435 | 367e86e8 | bellard | } |
436 | 367e86e8 | bellard | } |
437 | 367e86e8 | bellard | break;
|
438 | 367e86e8 | bellard | } |
439 | 367e86e8 | bellard | } |
440 | 367e86e8 | bellard | |
441 | 367e86e8 | bellard | symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
|
442 | 367e86e8 | bellard | if (!symtab_sec)
|
443 | 367e86e8 | bellard | error("could not find .symtab section");
|
444 | 367e86e8 | bellard | strtab_sec = &shdr[symtab_sec->sh_link]; |
445 | 367e86e8 | bellard | |
446 | 367e86e8 | bellard | symtab = load_data(fd, symtab_sec->sh_offset, symtab_sec->sh_size); |
447 | 367e86e8 | bellard | strtab = load_data(fd, strtab_sec->sh_offset, strtab_sec->sh_size); |
448 | 367e86e8 | bellard | |
449 | 367e86e8 | bellard | nb_syms = symtab_sec->sh_size / sizeof(Elf32_Sym);
|
450 | 367e86e8 | bellard | if (do_swap) {
|
451 | 367e86e8 | bellard | for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
452 | 367e86e8 | bellard | swab32s(&sym->st_name); |
453 | 367e86e8 | bellard | swab32s(&sym->st_value); |
454 | 367e86e8 | bellard | swab32s(&sym->st_size); |
455 | 367e86e8 | bellard | swab16s(&sym->st_shndx); |
456 | 367e86e8 | bellard | } |
457 | 367e86e8 | bellard | } |
458 | 367e86e8 | bellard | |
459 | 367e86e8 | bellard | switch(e_machine) {
|
460 | 367e86e8 | bellard | case EM_386:
|
461 | 367e86e8 | bellard | cpu_name = "i386";
|
462 | 367e86e8 | bellard | break;
|
463 | 367e86e8 | bellard | case EM_PPC:
|
464 | 367e86e8 | bellard | cpu_name = "ppc";
|
465 | 367e86e8 | bellard | break;
|
466 | 367e86e8 | bellard | case EM_MIPS:
|
467 | 367e86e8 | bellard | cpu_name = "mips";
|
468 | 367e86e8 | bellard | break;
|
469 | 367e86e8 | bellard | case EM_ARM:
|
470 | 367e86e8 | bellard | cpu_name = "arm";
|
471 | 367e86e8 | bellard | break;
|
472 | 367e86e8 | bellard | case EM_SPARC:
|
473 | 367e86e8 | bellard | cpu_name = "sparc";
|
474 | 367e86e8 | bellard | break;
|
475 | 367e86e8 | bellard | default:
|
476 | 367e86e8 | bellard | error("unsupported CPU (e_machine=%d)", e_machine);
|
477 | 367e86e8 | bellard | } |
478 | 367e86e8 | bellard | |
479 | 367e86e8 | bellard | fprintf(outfile, "#include \"gen-%s.h\"\n\n", cpu_name);
|
480 | 367e86e8 | bellard | |
481 | 367e86e8 | bellard | for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
482 | 367e86e8 | bellard | const char *name; |
483 | 367e86e8 | bellard | name = strtab + sym->st_name; |
484 | 367e86e8 | bellard | if (strstart(name, "op_", NULL) || |
485 | 367e86e8 | bellard | strstart(name, "op1_", NULL) || |
486 | 367e86e8 | bellard | strstart(name, "op2_", NULL) || |
487 | 367e86e8 | bellard | strstart(name, "op3_", NULL)) { |
488 | 367e86e8 | bellard | #if 0
|
489 | 367e86e8 | bellard | printf("%4d: %s pos=0x%08x len=%d\n",
|
490 | 367e86e8 | bellard | i, name, sym->st_value, sym->st_size);
|
491 | 367e86e8 | bellard | #endif
|
492 | 367e86e8 | bellard | if (sym->st_shndx != (text_sec - shdr))
|
493 | 367e86e8 | bellard | error("invalid section for opcode (0x%x)", sym->st_shndx);
|
494 | 367e86e8 | bellard | gen_code(name, sym->st_value, sym->st_size, outfile, |
495 | 367e86e8 | bellard | text, relocs, nb_relocs, reloc_sh_type, symtab, strtab); |
496 | 367e86e8 | bellard | } |
497 | 367e86e8 | bellard | } |
498 | 367e86e8 | bellard | |
499 | 367e86e8 | bellard | close(fd); |
500 | 367e86e8 | bellard | return 0; |
501 | 367e86e8 | bellard | } |
502 | 367e86e8 | bellard | |
503 | 367e86e8 | bellard | void usage(void) |
504 | 367e86e8 | bellard | { |
505 | 367e86e8 | bellard | printf("dyngen (c) 2003 Fabrice Bellard\n"
|
506 | 367e86e8 | bellard | "usage: dyngen [-o outfile] objfile\n"
|
507 | 367e86e8 | bellard | "Generate a dynamic code generator from an object file\n");
|
508 | 367e86e8 | bellard | exit(1);
|
509 | 367e86e8 | bellard | } |
510 | 367e86e8 | bellard | |
511 | 367e86e8 | bellard | int main(int argc, char **argv) |
512 | 367e86e8 | bellard | { |
513 | 367e86e8 | bellard | int c;
|
514 | 367e86e8 | bellard | const char *filename, *outfilename; |
515 | 367e86e8 | bellard | FILE *outfile; |
516 | 367e86e8 | bellard | |
517 | 367e86e8 | bellard | outfilename = "out.c";
|
518 | 367e86e8 | bellard | for(;;) {
|
519 | 367e86e8 | bellard | c = getopt(argc, argv, "ho:");
|
520 | 367e86e8 | bellard | if (c == -1) |
521 | 367e86e8 | bellard | break;
|
522 | 367e86e8 | bellard | switch(c) {
|
523 | 367e86e8 | bellard | case 'h': |
524 | 367e86e8 | bellard | usage(); |
525 | 367e86e8 | bellard | break;
|
526 | 367e86e8 | bellard | case 'o': |
527 | 367e86e8 | bellard | outfilename = optarg; |
528 | 367e86e8 | bellard | break;
|
529 | 367e86e8 | bellard | } |
530 | 367e86e8 | bellard | } |
531 | 367e86e8 | bellard | if (optind >= argc)
|
532 | 367e86e8 | bellard | usage(); |
533 | 367e86e8 | bellard | filename = argv[optind]; |
534 | 367e86e8 | bellard | outfile = fopen(outfilename, "w");
|
535 | 367e86e8 | bellard | if (!outfile)
|
536 | 367e86e8 | bellard | error("could not open '%s'", outfilename);
|
537 | 367e86e8 | bellard | load_elf(filename, outfile); |
538 | 367e86e8 | bellard | fclose(outfile); |
539 | 367e86e8 | bellard | return 0; |
540 | 367e86e8 | bellard | } |