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[Loader] Moved method elfLink from ModuleData to ElfTools, other minor stuff

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This commit is contained in:
Maschell 2018-02-14 18:18:42 +01:00
parent 389e3ba5f1
commit 894a60c2bf
5 changed files with 205 additions and 204 deletions
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197
loader/src/ElfTools.cpp
View File

@ -114,6 +114,203 @@ void ElfTools::elfLoadSymbols(size_t shndx, const void *destination, Elf32_Sym *
}
}
bool ElfTools::elfLink(Elf *elf, size_t shndx, void *destination, Elf32_Sym *symtab, size_t symtab_count, size_t symtab_strndx, bool allow_globals) {
Elf_Scn *scn;
for (scn = elf_nextscn(elf, NULL); scn != NULL; scn = elf_nextscn(elf, scn)) {
Elf32_Shdr *shdr;
shdr = elf32_getshdr(scn);
if (shdr == NULL)
continue;
switch (shdr->sh_type) {
case SHT_REL: {
const Elf32_Rel *rel;
Elf_Data *data;
size_t i;
if (shdr->sh_info != shndx){
continue;
}
data = elf_getdata(scn, NULL);
if (data == NULL){
continue;
}
rel = (const Elf32_Rel *) data->d_buf;
for (i = 0; i < shdr->sh_size / sizeof(Elf32_Rel); i++) {
uint32_t symbol_addr;
size_t symbol;
symbol = ELF32_R_SYM(rel[i].r_info);
if (symbol > symtab_count)
return false;
switch (symtab[symbol].st_shndx) {
case SHN_ABS: {
symbol_addr = symtab[symbol].st_value;
break;
} case SHN_COMMON: {
return false;
} case SHN_UNDEF: {
if (allow_globals) {
DEBUG_FUNCTION_LINE("The elf still have unresolved relocations. This is not supported.");
/*
Not support and not needed.
module_unresolved_relocation_t *reloc;
char *name;
reloc = (module_unresolved_relocation_t *) Module_ListAllocate(
&module_relocations,
sizeof(module_unresolved_relocation_t), 1,
&module_relocations_capacity,
&module_relocations_count,
MODULE_RELOCATIONS_CAPCITY_DEFAULT);
if (reloc == NULL)
return false;
name = elf_strptr(
elf, symtab_strndx, symtab[symbol].st_name);
if (name == NULL) {
module_relocations_count--;
return false;
}
reloc->name = strdup(name);
if (reloc->name == NULL) {
module_relocations_count--;
return false;
}
reloc->module = index;
reloc->address = destination;
reloc->offset = rel[i].r_offset;
reloc->type = ELF32_R_TYPE(rel[i].r_info);
reloc->addend = *(int *)((char *)destination + rel[i].r_offset);
continue;
*/
return false;
} else {
return false;
}
} default: {
if (symtab[symbol].st_other != 1) {
return false;
}
symbol_addr = symtab[symbol].st_value;
break;
}
}
if (!ElfTools::elfLinkOne(ELF32_R_TYPE(rel[i].r_info), rel[i].r_offset, *(int *)((char *)destination + rel[i].r_offset), destination, symbol_addr)){
return false;
}
}
break;
} case SHT_RELA: {
const Elf32_Rela *rela;
Elf_Data *data;
size_t i;
if (shdr->sh_info != shndx)
continue;
data = elf_getdata(scn, NULL);
if (data == NULL)
continue;
rela = (const Elf32_Rela *) data->d_buf;
for (i = 0; i < shdr->sh_size / sizeof(Elf32_Rela); i++) {
uint32_t symbol_addr;
size_t symbol;
symbol = ELF32_R_SYM(rela[i].r_info);
if (symbol > symtab_count)
return false;
switch (symtab[symbol].st_shndx) {
case SHN_ABS: {
symbol_addr = symtab[symbol].st_value;
break;
} case SHN_COMMON: {
return false;
} case SHN_UNDEF: {
if (allow_globals) {
DEBUG_FUNCTION_LINE("The elf still have unresolved relocations. This is not supported.");
/*
Not support and not needed.
module_unresolved_relocation_t *reloc;
char *name;
reloc = (module_unresolved_relocation_t *) Module_ListAllocate(
&module_relocations,
sizeof(module_unresolved_relocation_t), 1,
&module_relocations_capacity,
&module_relocations_count,
MODULE_RELOCATIONS_CAPCITY_DEFAULT);
if (reloc == NULL)
return false;
name = elf_strptr(
elf, symtab_strndx, symtab[symbol].st_name);
if (name == NULL) {
module_relocations_count--;
return false;
}
reloc->name = strdup(name);
if (reloc->name == NULL) {
module_relocations_count--;
return false;
}
DEBUG_FUNCTION_LINE("Adding relocation!\n");
reloc->module = index;
reloc->address = destination;
reloc->offset = rela[i].r_offset;
reloc->type = ELF32_R_TYPE(rela[i].r_info);
reloc->addend = rela[i].r_addend;
continue;*/
return false;
} else
return false;
} default: {
if (symtab[symbol].st_other != 1){
return false;
}
symbol_addr = symtab[symbol].st_value;
break;
}
}
if (!ElfTools::elfLinkOne(ELF32_R_TYPE(rela[i].r_info), rela[i].r_offset,rela[i].r_addend, destination, symbol_addr)){
return false;
}
}
break;
}
}
}
return true;
}
bool ElfTools::elfLinkOne(char type, size_t offset, int addend, void *destination, uint32_t symbol_addr) {
int value;
char *target = (char *)destination + offset;

1
loader/src/ElfTools.h
View File

@ -42,6 +42,7 @@ public:
static bool elfLoadSection(const Elf *elf, Elf_Scn *scn, const Elf32_Shdr *shdr,void *destination);
static bool loadElfSymtab(Elf *elf, Elf32_Sym **symtab, size_t *symtab_count, size_t *symtab_strndx);
static void elfLoadSymbols(size_t shndx, const void *destination, Elf32_Sym *symtab, size_t symtab_count);
static bool elfLink(Elf *elf, size_t shndx, void *destination, Elf32_Sym *symtab, size_t symtab_count, size_t symtab_strndx, bool allow_globals);
static bool elfLinkOne(char type, size_t offset, int addend, void *destination, uint32_t symbol_addr);
};

207
loader/src/ModuleData.cpp
View File

@ -103,10 +103,12 @@ bool ModuleData::load(uint8_t ** space) {
}
exit_error:
if (elf != NULL)
if (elf != NULL){
elf_end(elf);
if (fd != -1)
}
if (fd != -1){
close(fd);
}
return result;
}
@ -287,7 +289,7 @@ bool ModuleData::metadataRead(Elf *elf, Elf32_Sym *symtab, size_t symtab_count,
ElfTools::elfLoadSymbols(elf_ndxscn(scn), metadata, symtab, symtab_count);
if (!elfLink(elf, elf_ndxscn(scn), metadata, symtab, symtab_count, symtab_strndx, false)) {
if (!ElfTools::elfLink(elf, elf_ndxscn(scn), metadata, symtab, symtab_count, symtab_strndx, false)) {
DEBUG_FUNCTION_LINE("Warning: Ignoring '%s' - .wups.meta contains invalid relocations.\n", path);
goto exit_error;
}
@ -403,202 +405,6 @@ exit_error:
return false;
}
bool ModuleData::elfLink(Elf *elf, size_t shndx, void *destination, Elf32_Sym *symtab, size_t symtab_count, size_t symtab_strndx, bool allow_globals) {
Elf_Scn *scn;
for (scn = elf_nextscn(elf, NULL); scn != NULL; scn = elf_nextscn(elf, scn)) {
Elf32_Shdr *shdr;
shdr = elf32_getshdr(scn);
if (shdr == NULL)
continue;
switch (shdr->sh_type) {
case SHT_REL: {
const Elf32_Rel *rel;
Elf_Data *data;
size_t i;
if (shdr->sh_info != shndx){
continue;
}
data = elf_getdata(scn, NULL);
if (data == NULL){
continue;
}
rel = (const Elf32_Rel *) data->d_buf;
for (i = 0; i < shdr->sh_size / sizeof(Elf32_Rel); i++) {
uint32_t symbol_addr;
size_t symbol;
symbol = ELF32_R_SYM(rel[i].r_info);
if (symbol > symtab_count)
return false;
switch (symtab[symbol].st_shndx) {
case SHN_ABS: {
symbol_addr = symtab[symbol].st_value;
break;
} case SHN_COMMON: {
return false;
} case SHN_UNDEF: {
if (allow_globals) {
DEBUG_FUNCTION_LINE("The elf still have unresolved relocations. This is not supported.");
/*
Not support and not needed.
module_unresolved_relocation_t *reloc;
char *name;
reloc = (module_unresolved_relocation_t *) Module_ListAllocate(
&module_relocations,
sizeof(module_unresolved_relocation_t), 1,
&module_relocations_capacity,
&module_relocations_count,
MODULE_RELOCATIONS_CAPCITY_DEFAULT);
if (reloc == NULL)
return false;
name = elf_strptr(
elf, symtab_strndx, symtab[symbol].st_name);
if (name == NULL) {
module_relocations_count--;
return false;
}
reloc->name = strdup(name);
if (reloc->name == NULL) {
module_relocations_count--;
return false;
}
reloc->module = index;
reloc->address = destination;
reloc->offset = rel[i].r_offset;
reloc->type = ELF32_R_TYPE(rel[i].r_info);
reloc->addend = *(int *)((char *)destination + rel[i].r_offset);
continue;
*/
return false;
} else {
return false;
}
} default: {
if (symtab[symbol].st_other != 1) {
return false;
}
symbol_addr = symtab[symbol].st_value;
break;
}
}
if (!ElfTools::elfLinkOne(ELF32_R_TYPE(rel[i].r_info), rel[i].r_offset, *(int *)((char *)destination + rel[i].r_offset), destination, symbol_addr)){
return false;
}
}
break;
} case SHT_RELA: {
const Elf32_Rela *rela;
Elf_Data *data;
size_t i;
if (shdr->sh_info != shndx)
continue;
data = elf_getdata(scn, NULL);
if (data == NULL)
continue;
rela = (const Elf32_Rela *) data->d_buf;
for (i = 0; i < shdr->sh_size / sizeof(Elf32_Rela); i++) {
uint32_t symbol_addr;
size_t symbol;
symbol = ELF32_R_SYM(rela[i].r_info);
if (symbol > symtab_count)
return false;
switch (symtab[symbol].st_shndx) {
case SHN_ABS: {
symbol_addr = symtab[symbol].st_value;
break;
} case SHN_COMMON: {
return false;
} case SHN_UNDEF: {
if (allow_globals) {
DEBUG_FUNCTION_LINE("The elf still have unresolved relocations. This is not supported.");
/*
Not support and not needed.
module_unresolved_relocation_t *reloc;
char *name;
reloc = (module_unresolved_relocation_t *) Module_ListAllocate(
&module_relocations,
sizeof(module_unresolved_relocation_t), 1,
&module_relocations_capacity,
&module_relocations_count,
MODULE_RELOCATIONS_CAPCITY_DEFAULT);
if (reloc == NULL)
return false;
name = elf_strptr(
elf, symtab_strndx, symtab[symbol].st_name);
if (name == NULL) {
module_relocations_count--;
return false;
}
reloc->name = strdup(name);
if (reloc->name == NULL) {
module_relocations_count--;
return false;
}
DEBUG_FUNCTION_LINE("Adding relocation!\n");
reloc->module = index;
reloc->address = destination;
reloc->offset = rela[i].r_offset;
reloc->type = ELF32_R_TYPE(rela[i].r_info);
reloc->addend = rela[i].r_addend;
continue;*/
return false;
} else
return false;
} default: {
if (symtab[symbol].st_other != 1){
return false;
}
symbol_addr = symtab[symbol].st_value;
break;
}
}
if (!ElfTools::elfLinkOne(ELF32_R_TYPE(rela[i].r_info), rela[i].r_offset,rela[i].r_addend, destination, symbol_addr)){
return false;
}
}
break;
}
}
}
return true;
}
bool ModuleData::linkModuleElf(Elf *elf, uint8_t **space) {
Elf_Scn *scn;
size_t symtab_count, section_count, shstrndx, symtab_strndx, entries_count, hooks_count;
@ -630,7 +436,6 @@ bool ModuleData::linkModuleElf(Elf *elf, uint8_t **space) {
destinations = (uint8_t **) malloc(sizeof(uint8_t *) * section_count);
for (scn = elf_nextscn(elf, NULL); scn != NULL; scn = elf_nextscn(elf, scn)) {
Elf32_Shdr *shdr;
shdr = elf32_getshdr(scn);
@ -738,7 +543,7 @@ bool ModuleData::linkModuleElf(Elf *elf, uint8_t **space) {
(shdr->sh_flags & SHF_ALLOC) &&
destinations[elf_ndxscn(scn)] != NULL) {
if (!elfLink(elf, elf_ndxscn(scn), destinations[elf_ndxscn(scn)], symtab, symtab_count, symtab_strndx, true)){
if (!ElfTools::elfLink(elf, elf_ndxscn(scn), destinations[elf_ndxscn(scn)], symtab, symtab_count, symtab_strndx, true)){
goto exit_error;
}
}

2
loader/src/ModuleData.h
View File

@ -138,8 +138,6 @@ class ModuleData{
bool metadataRead(Elf *elf, Elf32_Sym *symtab, size_t symtab_count, size_t symtab_strndx);
bool elfLink(Elf *elf, size_t shndx, void *destination, Elf32_Sym *symtab, size_t symtab_count, size_t symtab_strndx, bool allow_globals);
bool linkModuleElf(Elf *elf, uint8_t **space);
bool loadedSuccessfully = false;