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[/] [openrisc/] [tags/] [or1ksim/] [or1ksim-0.4.0rc1/] [cpu/] [or32/] [dyngen-elf.c] - Blame information for rev 403

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/* dyngen-elf.c -- Elf parser for dyngen
   Copyright (C) 2005 Gy�rgy `nog' Jeney, nog@sdf.lonestar.org
 
This file is part of OpenRISC 1000 Architectural Simulator.
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
 
 
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <assert.h>
 
#include <elf.h>
 
#include "dyngen.h"
 
struct elf_obj {
  Elf32_Ehdr e_hdr;
  Elf32_Shdr *e_shdrs;
  void **e_sections;
  Elf32_Sym *e_syms; /* The symbol table in the elf file */
  unsigned int e_sym_num; /* The number of symbols */
  unsigned int e_sym_str_tab; /* The string-table associated with symbols */
  Elf32_Rel *e_rels;
  unsigned int e_rel_num; /* The number of relocations (in e_rel) */
  unsigned int e_rel_sym;
  unsigned int e_rel_sec; /* The section to modify */
  Elf32_Rela *e_relas;
  unsigned int e_rela_num; /* The number of relocations (in e_rela) */
  unsigned int e_rela_sym;
  unsigned int e_rela_sec; /* The section to modify */
};
 
void *elf_open_obj(const char *file)
{
  struct elf_obj *obj;
  FILE *f;
  int i;
 
  if(!(obj = malloc(sizeof(struct elf_obj)))) {
    fprintf(stderr, "OOM\n");
    return NULL;
  }
 
  if(!(f = fopen(file, "r"))) {
    free(obj);
    return NULL;
  }
 
  fread(&obj->e_hdr, sizeof(Elf32_Ehdr), 1, f);
 
  /* Do some sanity checks */
  if((obj->e_hdr.e_ident[EI_MAG0] != ELFMAG0) ||
     (obj->e_hdr.e_ident[EI_MAG1] != ELFMAG1) ||
     (obj->e_hdr.e_ident[EI_MAG2] != ELFMAG2) ||
     (obj->e_hdr.e_ident[EI_MAG3] != ELFMAG3)) {
    fprintf(stderr, "%s is not an elf file!\n", file);
    goto error_load;
  }
 
  if(obj->e_hdr.e_ident[EI_CLASS] == ELFCLASSNONE) {
    fprintf(stderr, "Invalid class in ELF header\n");
    goto error_load;
  }
 
  if(obj->e_hdr.e_ident[EI_DATA] == ELFDATANONE) {
    fprintf(stderr, "Invalid data format in ELF header\n");
    goto error_load;
  }
 
  /* FIXME: Swap data as necessary */
 
  if((obj->e_hdr.e_ident[EI_VERSION] != 1) ||
     (obj->e_hdr.e_version != 1)) {
    fprintf(stderr, "Unexpected elf version found: %i (%li)\n",
            obj->e_hdr.e_ident[EI_VERSION], (long int)obj->e_hdr.e_version);
    goto error_load;
  }
 
  if(obj->e_hdr.e_type != ET_REL) {
    fprintf(stderr, "Appears that we did not receive a object file\n");
    goto error_load;
  }
 
  if(obj->e_hdr.e_phoff) {
    fprintf(stderr, "What am I supposed to do with a program header??\n");
    goto error_load;
  }
 
  if(obj->e_hdr.e_ehsize != sizeof(Elf32_Ehdr)) {
    fprintf(stderr, "Unknown size of elf header\n");
    goto error_load;
  }
 
  if(!obj->e_hdr.e_shoff || !obj->e_hdr.e_shnum) {
    fprintf(stderr, "The elf file contains no sections!\n");
    goto error_load;
  }
 
  if(obj->e_hdr.e_shentsize != sizeof(Elf32_Shdr)) {
    fprintf(stderr, "Unknown section header size %i\n", obj->e_hdr.e_shentsize);
    goto error_load;
  }
 
  /* Load the section headers */
  if(!(obj->e_shdrs = malloc(obj->e_hdr.e_shentsize * obj->e_hdr.e_shnum))){
    fprintf(stderr, "OOM\n");
    goto error_load;
  }
 
  fseek(f, obj->e_hdr.e_shoff, SEEK_SET);
  fread(obj->e_shdrs, obj->e_hdr.e_shentsize, obj->e_hdr.e_shnum, f);
 
  /* FIXME: swap data */
 
  /* Load the sections */
  if(!(obj->e_sections = calloc(obj->e_hdr.e_shnum, sizeof(void *)))) {
    fprintf(stderr, "OOM\n");
    free(obj->e_shdrs);
    goto error_load;
  }
 
  for(i = 0; i < obj->e_hdr.e_shnum; i++) {
    if(obj->e_shdrs[i].sh_type == SHT_NOBITS)
      continue;
    if(!(obj->e_sections[i] = malloc(obj->e_shdrs[i].sh_size))) {
      fprintf(stderr, "OOM\n");
      goto post_sec_error_load;
    }
    fseek(f, obj->e_shdrs[i].sh_offset, SEEK_SET);
    fread(obj->e_sections[i], obj->e_shdrs[i].sh_size, 1, f);
  }
 
  obj->e_rels = NULL;
  obj->e_syms = NULL;
  obj->e_relas = NULL;
 
  /* Find the symbol table and relocation table(s) */
  for(i = 0; i < obj->e_hdr.e_shnum; i++) {
    switch(obj->e_shdrs[i].sh_type) {
    case SHT_SYMTAB:
      if(obj->e_syms) {
        fprintf(stderr, "ELF file has more than one symbol table\n");
        goto post_sec_error_load;
      }
      if(obj->e_shdrs[i].sh_entsize != sizeof(Elf32_Sym)) {
        fprintf(stderr, "ELF symbol table entry size is unknown\n");
        goto post_sec_error_load;
      }
      if((obj->e_shdrs[i].sh_size % obj->e_shdrs[i].sh_entsize)) {
        fprintf(stderr, "Symbol table's length is not a multiple of sizeof(Elf32_Sym\n");
        goto post_sec_error_load;
      }
      obj->e_syms = obj->e_sections[i];
      obj->e_sym_num = obj->e_shdrs[i].sh_size / obj->e_shdrs[i].sh_entsize;
      obj->e_sym_str_tab = obj->e_shdrs[i].sh_link;
      break;
    case SHT_REL:
      if(obj->e_rels) {
        fprintf(stderr, "ELF file has more than one relocation table\n");
        goto post_sec_error_load;
      }
      if(obj->e_shdrs[i].sh_entsize != sizeof(Elf32_Rel)) {
        fprintf(stderr, "ELF relocation table entry size is unknown\n");
        goto post_sec_error_load;
      }
      if((obj->e_shdrs[i].sh_size % obj->e_shdrs[i].sh_entsize)) {
        fprintf(stderr, "Relocation table's length is not a multiple of sizeof(Elf32_Rel\n");
        goto post_sec_error_load;
      }
      obj->e_rels = obj->e_sections[i];
      obj->e_rel_sec = obj->e_shdrs[i].sh_info;
      obj->e_rel_sym = obj->e_shdrs[i].sh_link;
      obj->e_rel_num = obj->e_shdrs[i].sh_size / obj->e_shdrs[i].sh_entsize;
      break;
    case SHT_RELA:
      if(obj->e_relas) {
        fprintf(stderr, "ELF file has more than one a-relocation table\n");
        goto post_sec_error_load;
      }
      if(obj->e_shdrs[i].sh_entsize != sizeof(Elf32_Rela)) {
        fprintf(stderr, "ELF a-relocation table entry size is unknown\n");
        goto post_sec_error_load;
      }
      if((obj->e_shdrs[i].sh_size % obj->e_shdrs[i].sh_entsize)) {
        fprintf(stderr, "Relocation table's length is not a multiple of sizeof(Elf32_Rela)\n");
        goto post_sec_error_load;
      }
      obj->e_relas = obj->e_sections[i];
      obj->e_rela_sec = obj->e_shdrs[i].sh_info;
      obj->e_rela_sym = obj->e_shdrs[i].sh_link;
      obj->e_rela_num = obj->e_shdrs[i].sh_size / obj->e_shdrs[i].sh_entsize;
      break;
    }
  }
 
  fclose(f);
  return obj;
 
post_sec_error_load:
  for(i = 0; i < obj->e_hdr.e_shnum; i++) {
    if(obj->e_sections[i])
      free(obj->e_sections[i]);
  }
  free(obj->e_sections);
  free(obj->e_shdrs);
error_load:
  free(obj);
  fclose(f);
  return NULL;
}
 
void elf_close_obj(void *e_obj)
{
  struct elf_obj *obj = e_obj;
  int i;
 
  for(i = 0; i < obj->e_hdr.e_shnum; i++) {
    if(obj->e_sections[i])
      free(obj->e_sections[i]);
  }
  free(obj->e_sections);
  free(obj->e_shdrs);
  free(obj);
}
 
static Elf32_Sym *elf_find_func(struct elf_obj *obj, unsigned int func)
{
  int i, j;
  Elf32_Sym *cur;
 
  for(i = 0, j = 0, cur = obj->e_syms; i < obj->e_sym_num; i++, cur++) {
    if(ELF32_ST_BIND(cur->st_info) != STB_GLOBAL)
      continue;
    if(ELF32_ST_TYPE(cur->st_info) != STT_FUNC)
      continue;
    if(j == func)
      return cur;
    j++;
  }
  return NULL;
}
 
char *elf_get_func_name(void *e_obj, unsigned int func)
{
  struct elf_obj *obj = e_obj;
  Elf32_Sym *func_sym = elf_find_func(obj, func);
 
  if(func_sym)
    return obj->e_sections[obj->e_sym_str_tab] + func_sym->st_name;
 
  return NULL;
}
 
unsigned int elf_get_func_len(void *e_obj, unsigned int func)
{
  struct elf_obj *obj = e_obj;
  Elf32_Sym *func_sym = elf_find_func(obj, func);
 
  if(func_sym)
    return func_sym->st_size;
  return 0;
}
 
void *elf_get_func_start(void *e_obj, unsigned int func)
{
  struct elf_obj *obj = e_obj;
  Elf32_Sym *func_sym = elf_find_func(obj, func);
 
  if(!func_sym)
    return NULL;
 
  if(func_sym->st_shndx == SHN_COMMON) {
    fprintf(stderr, "Don't know how to handle SHN_COMMON section header\n");
    return NULL;
  }
 
  return obj->e_sections[func_sym->st_shndx] + func_sym->st_value;
}
 
static char *elf_get_sym_name(struct elf_obj *obj, unsigned int sym)
{
  char *name;
 
  name = obj->e_sections[obj->e_sym_str_tab];
  name += obj->e_syms[sym].st_name;
 
  return name;
}
 
int elf_get_func_reloc(void *e_obj, unsigned int func, unsigned int relocn,
                       struct reloc *reloc)
{
  struct elf_obj *obj = e_obj;
  Elf32_Sym *func_sym = elf_find_func(obj, func);
  Elf32_Rel *cur;
  Elf32_Rela *cura;
  int i, j;
 
/*
  if(obj->e_rel_sec != func_sym->st_shndx) {
    fprintf(stderr, "Don't know what to do: Function does not have a relocation table\n");
    return 0;
  }
*/
 
  for(i = 0, j = 0, cur = obj->e_rels; i < obj->e_rel_num; i++, cur++) {
    if((cur->r_offset - func_sym->st_value) > func_sym->st_size)
      continue;
    if(relocn == j) {
      reloc->name = elf_get_sym_name(obj, ELF32_R_SYM(cur->r_info));
      reloc->func_offset = cur->r_offset - func_sym->st_value;
      reloc->type = ELF32_R_TYPE(cur->r_info);
      /* FIXME: Byte-swap */
      reloc->addend = *(uint32_t *)(obj->e_sections[obj->e_rel_sec] + cur->r_offset);
      return 1;
    }
    j++;
  }
 
  if(!obj->e_relas)
    return 0;
 
  for(i = 0, cura = obj->e_relas; i < obj->e_rela_num; i++, cura++) {
    if((cura->r_offset - func_sym->st_value) > func_sym->st_size)
      continue;
    if(relocn == j) {
      reloc->name = elf_get_sym_name(obj, ELF32_R_SYM(cur->r_info));
      reloc->func_offset = cura->r_offset - func_sym->st_value;
      reloc->type = ELF32_R_TYPE(cur->r_info);
      reloc->addend = cura->r_addend;
      return 1;
    }
    j++;
  }
 
  return 0;
}
 
const struct bff bffs = {
  elf_open_obj,
  elf_close_obj,
  elf_get_func_name,
  elf_get_func_start,
  elf_get_func_len,
  elf_get_func_reloc };

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[/] [openrisc/] [tags/] [or1ksim/] [or1ksim-0.4.0rc1/] [cpu/] [or32/] [dyngen-elf.c] - Blame information for rev 403

Line No.	Rev	Author	Line
1	19	jeremybenn	`/* dyngen-elf.c -- Elf parser for dyngen`
2			Copyright (C) 2005 Gy�rgy `nog' Jeney, nog@sdf.lonestar.org
3
4			`This file is part of OpenRISC 1000 Architectural Simulator.`
5
6			`This program is free software; you can redistribute it and/or modify`
7			`it under the terms of the GNU General Public License as published by`
8			`the Free Software Foundation; either version 2 of the License, or`
9			`(at your option) any later version.`
10
11			`This program is distributed in the hope that it will be useful,`
12			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
14			`GNU General Public License for more details.`
15
16			`You should have received a copy of the GNU General Public License`
17			`along with this program; if not, write to the Free Software`
18			`Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */`
19
20
21			`#include <stdio.h>`
22			`#include <stdlib.h>`
23			`#include <stdint.h>`
24			`#include <assert.h>`
25
26			`#include <elf.h>`
27
28			`#include "dyngen.h"`
29
30			`struct elf_obj {`
31			`Elf32_Ehdr e_hdr;`
32			`Elf32_Shdr *e_shdrs;`
33			`void **e_sections;`
34			`Elf32_Sym e_syms; / The symbol table in the elf file */`
35			`unsigned int e_sym_num; /* The number of symbols */`
36			`unsigned int e_sym_str_tab; /* The string-table associated with symbols */`
37			`Elf32_Rel *e_rels;`
38			`unsigned int e_rel_num; /* The number of relocations (in e_rel) */`
39			`unsigned int e_rel_sym;`
40			`unsigned int e_rel_sec; /* The section to modify */`
41			`Elf32_Rela *e_relas;`
42			`unsigned int e_rela_num; /* The number of relocations (in e_rela) */`
43			`unsigned int e_rela_sym;`
44			`unsigned int e_rela_sec; /* The section to modify */`
45			`};`
46
47			`void elf_open_obj(const char file)`
48			`{`
49			`struct elf_obj *obj;`
50			`FILE *f;`
51			`int i;`
52
53			`if(!(obj = malloc(sizeof(struct elf_obj)))) {`
54			`fprintf(stderr, "OOM\n");`
55			`return NULL;`
56			`}`
57
58			`if(!(f = fopen(file, "r"))) {`
59			`free(obj);`
60			`return NULL;`
61			`}`
62
63			`fread(&obj->e_hdr, sizeof(Elf32_Ehdr), 1, f);`
64
65			`/* Do some sanity checks */`
66			`if((obj->e_hdr.e_ident[EI_MAG0] != ELFMAG0) \|\|`
67			`(obj->e_hdr.e_ident[EI_MAG1] != ELFMAG1) \|\|`
68			`(obj->e_hdr.e_ident[EI_MAG2] != ELFMAG2) \|\|`
69			`(obj->e_hdr.e_ident[EI_MAG3] != ELFMAG3)) {`
70			`fprintf(stderr, "%s is not an elf file!\n", file);`
71			`goto error_load;`
72			`}`
73
74			`if(obj->e_hdr.e_ident[EI_CLASS] == ELFCLASSNONE) {`
75			`fprintf(stderr, "Invalid class in ELF header\n");`
76			`goto error_load;`
77			`}`
78
79			`if(obj->e_hdr.e_ident[EI_DATA] == ELFDATANONE) {`
80			`fprintf(stderr, "Invalid data format in ELF header\n");`
81			`goto error_load;`
82			`}`
83
84			`/* FIXME: Swap data as necessary */`
85
86			`if((obj->e_hdr.e_ident[EI_VERSION] != 1) \|\|`
87			`(obj->e_hdr.e_version != 1)) {`
88			`fprintf(stderr, "Unexpected elf version found: %i (%li)\n",`
89			`obj->e_hdr.e_ident[EI_VERSION], (long int)obj->e_hdr.e_version);`
90			`goto error_load;`
91			`}`
92
93			`if(obj->e_hdr.e_type != ET_REL) {`
94			`fprintf(stderr, "Appears that we did not receive a object file\n");`
95			`goto error_load;`
96			`}`
97
98			`if(obj->e_hdr.e_phoff) {`
99			`fprintf(stderr, "What am I supposed to do with a program header??\n");`
100			`goto error_load;`
101			`}`
102
103			`if(obj->e_hdr.e_ehsize != sizeof(Elf32_Ehdr)) {`
104			`fprintf(stderr, "Unknown size of elf header\n");`
105			`goto error_load;`
106			`}`
107
108			`if(!obj->e_hdr.e_shoff \|\| !obj->e_hdr.e_shnum) {`
109			`fprintf(stderr, "The elf file contains no sections!\n");`
110			`goto error_load;`
111			`}`
112
113			`if(obj->e_hdr.e_shentsize != sizeof(Elf32_Shdr)) {`
114			`fprintf(stderr, "Unknown section header size %i\n", obj->e_hdr.e_shentsize);`
115			`goto error_load;`
116			`}`
117
118			`/* Load the section headers */`
119			`if(!(obj->e_shdrs = malloc(obj->e_hdr.e_shentsize * obj->e_hdr.e_shnum))){`
120			`fprintf(stderr, "OOM\n");`
121			`goto error_load;`
122			`}`
123
124			`fseek(f, obj->e_hdr.e_shoff, SEEK_SET);`
125			`fread(obj->e_shdrs, obj->e_hdr.e_shentsize, obj->e_hdr.e_shnum, f);`
126
127			`/* FIXME: swap data */`
128
129			`/* Load the sections */`
130			`if(!(obj->e_sections = calloc(obj->e_hdr.e_shnum, sizeof(void *)))) {`
131			`fprintf(stderr, "OOM\n");`
132			`free(obj->e_shdrs);`
133			`goto error_load;`
134			`}`
135
136			`for(i = 0; i < obj->e_hdr.e_shnum; i++) {`
137			`if(obj->e_shdrs[i].sh_type == SHT_NOBITS)`
138			`continue;`
139			`if(!(obj->e_sections[i] = malloc(obj->e_shdrs[i].sh_size))) {`
140			`fprintf(stderr, "OOM\n");`
141			`goto post_sec_error_load;`
142			`}`
143			`fseek(f, obj->e_shdrs[i].sh_offset, SEEK_SET);`
144			`fread(obj->e_sections[i], obj->e_shdrs[i].sh_size, 1, f);`
145			`}`
146
147			`obj->e_rels = NULL;`
148			`obj->e_syms = NULL;`
149			`obj->e_relas = NULL;`
150
151			`/* Find the symbol table and relocation table(s) */`
152			`for(i = 0; i < obj->e_hdr.e_shnum; i++) {`
153			`switch(obj->e_shdrs[i].sh_type) {`
154			`case SHT_SYMTAB:`
155			`if(obj->e_syms) {`
156			`fprintf(stderr, "ELF file has more than one symbol table\n");`
157			`goto post_sec_error_load;`
158			`}`
159			`if(obj->e_shdrs[i].sh_entsize != sizeof(Elf32_Sym)) {`
160			`fprintf(stderr, "ELF symbol table entry size is unknown\n");`
161			`goto post_sec_error_load;`
162			`}`
163			`if((obj->e_shdrs[i].sh_size % obj->e_shdrs[i].sh_entsize)) {`
164			`fprintf(stderr, "Symbol table's length is not a multiple of sizeof(Elf32_Sym\n");`
165			`goto post_sec_error_load;`
166			`}`
167			`obj->e_syms = obj->e_sections[i];`
168			`obj->e_sym_num = obj->e_shdrs[i].sh_size / obj->e_shdrs[i].sh_entsize;`
169			`obj->e_sym_str_tab = obj->e_shdrs[i].sh_link;`
170			`break;`
171			`case SHT_REL:`
172			`if(obj->e_rels) {`
173			`fprintf(stderr, "ELF file has more than one relocation table\n");`
174			`goto post_sec_error_load;`
175			`}`
176			`if(obj->e_shdrs[i].sh_entsize != sizeof(Elf32_Rel)) {`
177			`fprintf(stderr, "ELF relocation table entry size is unknown\n");`
178			`goto post_sec_error_load;`
179			`}`
180			`if((obj->e_shdrs[i].sh_size % obj->e_shdrs[i].sh_entsize)) {`
181			`fprintf(stderr, "Relocation table's length is not a multiple of sizeof(Elf32_Rel\n");`
182			`goto post_sec_error_load;`
183			`}`
184			`obj->e_rels = obj->e_sections[i];`
185			`obj->e_rel_sec = obj->e_shdrs[i].sh_info;`
186			`obj->e_rel_sym = obj->e_shdrs[i].sh_link;`
187			`obj->e_rel_num = obj->e_shdrs[i].sh_size / obj->e_shdrs[i].sh_entsize;`
188			`break;`
189			`case SHT_RELA:`
190			`if(obj->e_relas) {`
191			`fprintf(stderr, "ELF file has more than one a-relocation table\n");`
192			`goto post_sec_error_load;`
193			`}`
194			`if(obj->e_shdrs[i].sh_entsize != sizeof(Elf32_Rela)) {`
195			`fprintf(stderr, "ELF a-relocation table entry size is unknown\n");`
196			`goto post_sec_error_load;`
197			`}`
198			`if((obj->e_shdrs[i].sh_size % obj->e_shdrs[i].sh_entsize)) {`
199			`fprintf(stderr, "Relocation table's length is not a multiple of sizeof(Elf32_Rela)\n");`
200			`goto post_sec_error_load;`
201			`}`
202			`obj->e_relas = obj->e_sections[i];`
203			`obj->e_rela_sec = obj->e_shdrs[i].sh_info;`
204			`obj->e_rela_sym = obj->e_shdrs[i].sh_link;`
205			`obj->e_rela_num = obj->e_shdrs[i].sh_size / obj->e_shdrs[i].sh_entsize;`
206			`break;`
207			`}`
208			`}`
209
210			`fclose(f);`
211			`return obj;`
212
213			`post_sec_error_load:`
214			`for(i = 0; i < obj->e_hdr.e_shnum; i++) {`
215			`if(obj->e_sections[i])`
216			`free(obj->e_sections[i]);`
217			`}`
218			`free(obj->e_sections);`
219			`free(obj->e_shdrs);`
220			`error_load:`
221			`free(obj);`
222			`fclose(f);`
223			`return NULL;`
224			`}`
225
226			`void elf_close_obj(void *e_obj)`
227			`{`
228			`struct elf_obj *obj = e_obj;`
229			`int i;`
230
231			`for(i = 0; i < obj->e_hdr.e_shnum; i++) {`
232			`if(obj->e_sections[i])`
233			`free(obj->e_sections[i]);`
234			`}`
235			`free(obj->e_sections);`
236			`free(obj->e_shdrs);`
237			`free(obj);`
238			`}`
239
240			`static Elf32_Sym elf_find_func(struct elf_obj obj, unsigned int func)`
241			`{`
242			`int i, j;`
243			`Elf32_Sym *cur;`
244
245			`for(i = 0, j = 0, cur = obj->e_syms; i < obj->e_sym_num; i++, cur++) {`
246			`if(ELF32_ST_BIND(cur->st_info) != STB_GLOBAL)`
247			`continue;`
248			`if(ELF32_ST_TYPE(cur->st_info) != STT_FUNC)`
249			`continue;`
250			`if(j == func)`
251			`return cur;`
252			`j++;`
253			`}`
254			`return NULL;`
255			`}`
256
257			`char elf_get_func_name(void e_obj, unsigned int func)`
258			`{`
259			`struct elf_obj *obj = e_obj;`
260			`Elf32_Sym *func_sym = elf_find_func(obj, func);`
261
262			`if(func_sym)`
263			`return obj->e_sections[obj->e_sym_str_tab] + func_sym->st_name;`
264
265			`return NULL;`
266			`}`
267
268			`unsigned int elf_get_func_len(void *e_obj, unsigned int func)`
269			`{`
270			`struct elf_obj *obj = e_obj;`
271			`Elf32_Sym *func_sym = elf_find_func(obj, func);`
272
273			`if(func_sym)`
274			`return func_sym->st_size;`
275			`return 0;`
276			`}`
277
278			`void elf_get_func_start(void e_obj, unsigned int func)`
279			`{`
280			`struct elf_obj *obj = e_obj;`
281			`Elf32_Sym *func_sym = elf_find_func(obj, func);`
282
283			`if(!func_sym)`
284			`return NULL;`
285
286			`if(func_sym->st_shndx == SHN_COMMON) {`
287			`fprintf(stderr, "Don't know how to handle SHN_COMMON section header\n");`
288			`return NULL;`
289			`}`
290
291			`return obj->e_sections[func_sym->st_shndx] + func_sym->st_value;`
292			`}`
293
294			`static char elf_get_sym_name(struct elf_obj obj, unsigned int sym)`
295			`{`
296			`char *name;`
297
298			`name = obj->e_sections[obj->e_sym_str_tab];`
299			`name += obj->e_syms[sym].st_name;`
300
301			`return name;`
302			`}`
303
304			`int elf_get_func_reloc(void *e_obj, unsigned int func, unsigned int relocn,`
305			`struct reloc *reloc)`
306			`{`
307			`struct elf_obj *obj = e_obj;`
308			`Elf32_Sym *func_sym = elf_find_func(obj, func);`
309			`Elf32_Rel *cur;`
310			`Elf32_Rela *cura;`
311			`int i, j;`
312
313			`/*`
314			`if(obj->e_rel_sec != func_sym->st_shndx) {`
315			`fprintf(stderr, "Don't know what to do: Function does not have a relocation table\n");`
316			`return 0;`
317			`}`
318			`*/`
319
320			`for(i = 0, j = 0, cur = obj->e_rels; i < obj->e_rel_num; i++, cur++) {`
321			`if((cur->r_offset - func_sym->st_value) > func_sym->st_size)`
322			`continue;`
323			`if(relocn == j) {`
324			`reloc->name = elf_get_sym_name(obj, ELF32_R_SYM(cur->r_info));`
325			`reloc->func_offset = cur->r_offset - func_sym->st_value;`
326			`reloc->type = ELF32_R_TYPE(cur->r_info);`
327			`/* FIXME: Byte-swap */`
328			`reloc->addend = (uint32_t )(obj->e_sections[obj->e_rel_sec] + cur->r_offset);`
329			`return 1;`
330			`}`
331			`j++;`
332			`}`
333
334			`if(!obj->e_relas)`
335			`return 0;`
336
337			`for(i = 0, cura = obj->e_relas; i < obj->e_rela_num; i++, cura++) {`
338			`if((cura->r_offset - func_sym->st_value) > func_sym->st_size)`
339			`continue;`
340			`if(relocn == j) {`
341			`reloc->name = elf_get_sym_name(obj, ELF32_R_SYM(cur->r_info));`
342			`reloc->func_offset = cura->r_offset - func_sym->st_value;`
343			`reloc->type = ELF32_R_TYPE(cur->r_info);`
344			`reloc->addend = cura->r_addend;`
345			`return 1;`
346			`}`
347			`j++;`
348			`}`
349
350			`return 0;`
351			`}`
352
353			`const struct bff bffs = {`
354			`elf_open_obj,`
355			`elf_close_obj,`
356			`elf_get_func_name,`
357			`elf_get_func_start,`
358			`elf_get_func_len,`
359			`elf_get_func_reloc };`