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comparison objgrep/tables.c @ 167:c25367bb7656

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objgrep: written, compiles
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 04 Jul 2014 00:54:33 +0000
parents leo-obj/tool/tables.c@fd772de226cb
children 77cd647375e5
comparison
equal deleted inserted replaced
166:861f5ca49581 167:c25367bb7656
1 /*
2 * This C module contains functions for the initial parsing
3 * of the section and symbol tables.
4 */
5
6 #include <sys/types.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <strings.h>
11 #include "filestruct.h"
12 #include "intstruct.h"
13 #include "globals.h"
14
15 extern unsigned get_u16(), get_u32();
16
17 initial_parse_hdr()
18 {
19 unsigned symtab_offset;
20
21 filehdr_struct = (struct external_filehdr *) objfilemap;
22 if (get_u16(filehdr_struct->f_magic) != 0xC2) {
23 fprintf(stderr, "error: %s is not a TI COFF2 object\n",
24 objfilename);
25 exit(2);
26 }
27 if (get_u16(filehdr_struct->f_target_id) != 0x97) {
28 fprintf(stderr, "error: TI COFF object %s is not for TMS470\n",
29 objfilename);
30 exit(2);
31 }
32 if (get_u16(filehdr_struct->f_opthdr)) {
33 fprintf(stderr,
34 "error: %s has the \"optional\" header present\n",
35 objfilename);
36 exit(2);
37 }
38 sections_raw = (struct external_scnhdr *)
39 (objfilemap + sizeof(struct external_filehdr));
40 nsections = get_u16(filehdr_struct->f_nscns);
41 symtab_offset = get_u32(filehdr_struct->f_symptr);
42 symtab_raw = (struct external_syment *)(objfilemap + symtab_offset);
43 nsymtab = get_u32(filehdr_struct->f_nsyms);
44 strtab_offset = symtab_offset +
45 sizeof(struct external_syment) * nsymtab;
46 }
47
48 static char *
49 get_secorsym_name(ptr)
50 u_char *ptr;
51 {
52 char *alloc;
53
54 if (ptr[0]) {
55 if (ptr[7]) {
56 alloc = malloc(9);
57 if (!alloc) {
58 perror("malloc");
59 exit(2);
60 }
61 bcopy(ptr, alloc, 8);
62 alloc[8] = '\0';
63 return(alloc);
64 } else
65 return((char *) ptr);
66 }
67 if (ptr[1] || ptr[2] || ptr[3]) {
68 fprintf(stderr, "error: malformed name in %s at offset 0x%x\n",
69 objfilename, ptr - objfilemap);
70 exit(2);
71 }
72 return(objfilemap + strtab_offset + get_u32(ptr+4));
73 }
74
75 get_int_section_table()
76 {
77 unsigned n;
78
79 sections = malloc(sizeof(struct internal_scnhdr) * nsections);
80 if (!sections) {
81 perror("malloc");
82 exit(2);
83 }
84 for (n = 0; n < nsections; n++) {
85 sections[n].name = get_secorsym_name(sections_raw[n].s_name);
86 if (get_u32(sections_raw[n].s_paddr))
87 fprintf(stderr,
88 "warning: section #%u (%s) has nonzero paddr\n",
89 n, sections[n].name);
90 if (get_u32(sections_raw[n].s_vaddr))
91 fprintf(stderr,
92 "warning: section #%u (%s) has nonzero vaddr\n",
93 n, sections[n].name);
94 sections[n].size = get_u32(sections_raw[n].s_size);
95 sections[n].data_offset = get_u32(sections_raw[n].s_scnptr);
96 sections[n].reloc_offset = get_u32(sections_raw[n].s_relptr);
97 sections[n].line_offset = get_u32(sections_raw[n].s_lnnoptr);
98 sections[n].nreloc = get_u32(sections_raw[n].s_nreloc);
99 sections[n].nlineent = get_u32(sections_raw[n].s_nlnno);
100 sections[n].flags = get_u32(sections_raw[n].s_flags);
101 if (get_u16(sections_raw[n].s_reserved))
102 fprintf(stderr,
103 "warning: section #%u (%s): some nonzero value in s_reserved bytes\n",
104 n, sections[n].name);
105 if (get_u16(sections_raw[n].s_page))
106 fprintf(stderr,
107 "warning: section #%u (%s): some nonzero value in s_page bytes\n",
108 n, sections[n].name);
109 sections[n].nsymbols = 0;
110 }
111 }
112
113 get_int_symbol_table()
114 {
115 unsigned n;
116 struct internal_syment *in;
117
118 symtab = malloc(sizeof(struct internal_syment *) * nsymtab);
119 if (!symtab) {
120 perror("malloc");
121 exit(2);
122 }
123 for (n = 0; n < nsymtab; ) {
124 in = malloc(sizeof(struct internal_syment));
125 if (!in) {
126 perror("malloc");
127 exit(2);
128 }
129 symtab[n] = in;
130 in->number = n;
131 in->name = get_secorsym_name(symtab_raw[n].e_name);
132 in->value = get_u32(symtab_raw[n].e_value);
133 in->scnum = get_s16(symtab_raw[n].e_scnum);
134 if (in->scnum > 0) {
135 if (in->scnum > nsections) {
136 fprintf(stderr,
137 "symtab entry #%u: scnum too big\n", n);
138 exit(2);
139 }
140 in->section = sections + in->scnum - 1;
141 in->section->nsymbols++;
142 } else if (in->scnum < -2) {
143 fprintf(stderr,
144 "symtab entry #%u: scnum < -2\n", n);
145 exit(2);
146 } else
147 in->section = 0;
148 in->type = get_u16(symtab_raw[n].e_type);
149 in->class = symtab_raw[n].e_sclass;
150 switch (symtab_raw[n++].e_numaux) {
151 case 0:
152 in->aux = 0;
153 continue;
154 case 1:
155 if (n >= nsymtab) {
156 fprintf(stderr,
157 "error: last symbol's aux spills over\n");
158 exit(2);
159 }
160 symtab[n] = 0;
161 in->aux = (u_char *)(symtab_raw + n);
162 n++;
163 continue;
164 default:
165 n--;
166 fprintf(stderr, "symtab entry #%u: invalid numaux\n",
167 n);
168 exit(2);
169 }
170 }
171 }