static void read_field(Context * ctx, const Symbol * sym, ContextAddress base, ContextAddress * value) {
LocationInfo * loc_info = NULL;
LocationExpressionState * state = NULL;
uint64_t args[1];
void * buf = NULL;
size_t size = 0;
size_t i;
args[0] = base;
if (get_location_info(sym, &loc_info) < 0) exception(errno);
if (loc_info->args_cnt != 1) str_exception(ERR_OTHER, "Wrong object kind");
state = evaluate_location_expression(ctx, NULL,
loc_info->value_cmds.cmds, loc_info->value_cmds.cnt, args, 1);
if (state->pieces_cnt > 0) {
read_location_pieces(state->ctx, state->stack_frame,
state->pieces, state->pieces_cnt, loc_info->big_endian, &buf, &size);
}
else {
ContextAddress sym_size = 0;
if (state->stk_pos != 1) str_exception(ERR_OTHER, "Invalid location expression");
if (get_symbol_size(sym, &sym_size) < 0) exception(errno);
size = (size_t)sym_size;
buf = tmp_alloc(size);
if (context_read_mem(state->ctx, (ContextAddress)state->stk[0], buf, size) < 0) exception(errno);
}
*value = 0;
for (i = 0; i < size && i < sizeof(ContextAddress); i++) {
*value = *value << 8;
*value |= ((uint8_t *)buf)[loc_info->big_endian ? i : size - i - 1];
}
}
int ini_server(const char * url, Protocol * p, TCFBroadcastGroup * b) {
ChannelServer * serv = NULL;
PeerServer * ps = NULL;
Trap trap;
if (!set_trap(&trap)) {
bcg = NULL;
proto = NULL;
if (ps != NULL) peer_server_free(ps);
errno = trap.error;
return -1;
}
bcg = b;
proto = p;
ps = channel_peer_from_url(url);
if (ps == NULL) str_exception(ERR_OTHER, "Invalid server URL");
peer_server_addprop(ps, loc_strdup("Name"), loc_strdup(PROXY_NAME));
peer_server_addprop(ps, loc_strdup("Proxy"), loc_strdup(""));
SERVER_ADDPROP_HOOK;
serv = channel_server(ps);
if (serv == NULL) exception(errno);
serv->new_conn = channel_new_connection;
clear_trap(&trap);
add_channel_redirection_listener(channel_redirection_listener);
return 0;
}
DWARFCache * get_dwarf_cache(ELF_File * File) {
DWARFCache * Cache = (DWARFCache *)File->dwarf_dt_cache;
if (Cache == NULL) {
Trap trap;
if (!sCloseListenerOK) {
elf_add_close_listener(free_dwarf_cache);
sCloseListenerOK = 1;
}
sCache = Cache = (DWARFCache *)(File->dwarf_dt_cache = loc_alloc_zero(sizeof(DWARFCache)));
sCache->magic = SYM_CACHE_MAGIC;
sCache->mFile = File;
sCache->mObjectHash = loc_alloc_zero(sizeof(ObjectInfo *) * OBJ_HASH_SIZE);
if (set_trap(&trap)) {
dio_LoadAbbrevTable(File);
load_symbol_tables();
load_debug_sections();
clear_trap(&trap);
}
else {
sCache->mErrorCode = trap.error;
strncpy(sCache->mErrorMsg, trap.msg, sizeof(sCache->mErrorMsg) - 1);
}
sCache = NULL;
}
if (Cache->mErrorCode) str_exception(Cache->mErrorCode, Cache->mErrorMsg);
return Cache;
}
static void load_debug_sections(void) {
Trap trap;
unsigned idx;
ELF_File * File = sCache->mFile;
memset(&trap, 0, sizeof(trap));
sSymbolTableLen = sCache->mSymbolTableLen;
sObjectList = NULL;
sObjectListTail = NULL;
sCompUnitsMax = 0;
for (idx = 1; idx < File->section_cnt; idx++) {
ELF_Section * sec = File->sections + idx;
if (sec->size == 0) continue;
if (sec->name == NULL) continue;
if (strcmp(sec->name, ".debug") == 0 || strcmp(sec->name, ".debug_info") == 0) {
sDebugSection = sec;
sParentObject = NULL;
sPrevSibling = NULL;
dio_EnterDebugSection(NULL, sec, 0);
if (set_trap(&trap)) {
while (dio_GetPos() < sec->size) {
dio_ReadUnit(&sUnitDesc, entry_callback);
sCompUnit->mDesc = sUnitDesc;
}
clear_trap(&trap);
}
dio_ExitSection();
sParentObject = NULL;
sPrevSibling = NULL;
sCompUnit = NULL;
sDebugSection = NULL;
if (trap.error) break;
}
else if (strcmp(sec->name, ".debug_ranges") == 0) {
sCache->mDebugRanges = sec;
}
else if (strcmp(sec->name, ".debug_aranges") == 0) {
sCache->mDebugARanges = sec;
}
else if (strcmp(sec->name, ".debug_line") == 0) {
sCache->mDebugLine = sec;
}
else if (strcmp(sec->name, ".debug_loc") == 0) {
sCache->mDebugLoc = sec;
}
}
if (sObjectList == NULL) {
loc_free(sCache->mObjectHash);
sCache->mObjectHash = NULL;
}
sCache->mObjectList = sObjectList;
sSymbolTableLen = 0;
sObjectList = NULL;
sObjectListTail = NULL;
sCompUnitsMax = 0;
if (trap.error) str_exception(trap.error, trap.msg);
}
static ContextAddress find_module(Context * ctx, ELF_File * exe_file, ELF_File * module,
ContextAddress r_map, ContextAddress r_brk) {
#if ENABLE_Symbols
Symbol * sym = NULL;
int i = 0, n = 0;
Symbol ** children = NULL;
ContextAddress link = r_map;
Symbol * sym_l_addr = NULL;
Symbol * sym_l_next = NULL;
Symbol * sym_l_tls_modid = NULL;
if (find_symbol_by_name(ctx, STACK_NO_FRAME, r_brk, "link_map", &sym) < 0)
str_exception(errno, "Cannot find loader symbol: link_map");
if (get_symbol_children(sym, &children, &n) < 0) exception(errno);
for (i = 0; i < n; i++) {
char * name = NULL;
if (get_symbol_name(children[i], &name) < 0) exception(errno);
if (name == NULL) continue;
if (strcmp(name, "l_map_start") == 0) sym_l_addr = children[i];
else if (strcmp(name, "l_next") == 0) sym_l_next = children[i];
else if (strcmp(name, "l_tls_modid") == 0) sym_l_tls_modid = children[i];
}
if (sym_l_addr == NULL || sym_l_next == NULL || sym_l_tls_modid == NULL)
str_exception(ERR_OTHER, "Invalid 'link_map' fields");
while (link != 0) {
ContextAddress l_tls_modid = 0;
read_field(ctx, sym_l_tls_modid, link, &l_tls_modid);
if (l_tls_modid != 0) {
ContextAddress l_addr = 0;
ELF_File * link_file = NULL;
read_field(ctx, sym_l_addr, link, &l_addr);
elf_map_to_link_time_address(ctx, l_addr, 0, &link_file, NULL);
if (link_file != NULL) {
if (link_file == module) return l_tls_modid;
if (get_dwarf_file(link_file) == module) return l_tls_modid;
}
}
read_field(ctx, sym_l_next, link, &link);
}
#endif
return 0;
}
ContextAddress get_tls_address(Context * ctx, ELF_File * file) {
ContextAddress mod_tls_addr = 0;
RegisterIdScope reg_id_scope;
memset(®_id_scope, 0, sizeof(reg_id_scope));
reg_id_scope.machine = file->machine;
reg_id_scope.os_abi = file->os_abi;
reg_id_scope.elf64 = file->elf64;
reg_id_scope.big_endian = file->big_endian;
reg_id_scope.id_type = REGNUM_DWARF;
switch (file->machine) {
case EM_X86_64:
{
uint8_t buf[8];
ContextAddress tcb_addr = 0;
ContextAddress vdt_addr = 0;
ContextAddress mod_id = 0;
RegisterDefinition * reg_def = get_reg_by_id(ctx, 58, ®_id_scope);
if (reg_def == NULL) exception(errno);
if (context_read_reg(ctx, reg_def, 0, reg_def->size, buf) < 0)
str_exception(errno, "Cannot read TCB base register");
tcb_addr = to_address(buf, reg_def->size, reg_def->big_endian);
if (elf_read_memory_word(ctx, file, tcb_addr + 8, &vdt_addr) < 0)
str_exception(errno, "Cannot read TCB");
mod_id = get_module_id(ctx, file);
if (elf_read_memory_word(ctx, file, vdt_addr + mod_id * 16, &mod_tls_addr) < 0)
str_exception(errno, "Cannot read VDT");
if (mod_tls_addr == 0 || mod_tls_addr == ~(ContextAddress)0)
str_exception(errno, "Thread local storage is not allocated yet");
}
break;
default:
str_fmt_exception(ERR_INV_CONTEXT,
"Thread local storage access is not supported yet for machine type %d",
file->machine);
}
return mod_tls_addr;
}
static ContextAddress get_module_id(Context * ctx, ELF_File * module) {
ELF_File * exe_file = NULL;
ContextAddress addr = elf_get_debug_structure_address(ctx, &exe_file);
size_t word_size = exe_file && exe_file->elf64 ? 8 : 4;
Trap trap;
if (addr == 0 || exe_file == NULL) str_exception(ERR_OTHER, "Cannot find loader debug data");
if (set_trap(&trap)) {
ContextAddress r_map = 0;
ContextAddress r_brk = 0;
ContextAddress mod_id = 0;
if (elf_read_memory_word(ctx, exe_file, addr + word_size * 1, &r_map) < 0) exception(errno);
if (elf_read_memory_word(ctx, exe_file, addr + word_size * 2, &r_brk) < 0) exception(errno);
if (r_map != 0 && r_brk != 0) mod_id = find_module(ctx, exe_file, module, r_map, r_brk);
clear_trap(&trap);
if (mod_id) return mod_id;
}
else {
str_exception(trap.error, "Cannot access target ELF loader data");
}
str_exception(ERR_OTHER, "Cannot get TLS module ID");
return 0;
}
static LONG NTAPI VectoredExceptionHandler(PEXCEPTION_POINTERS x) {
if (is_dispatch_thread()) {
DWORD exception_code = x->ExceptionRecord->ExceptionCode;
if (exception_code == EXCEPTION_IN_PAGE_ERROR) {
int error = ERR_OTHER;
if (x->ExceptionRecord->NumberParameters >= 3) {
ULONG status = (ULONG)x->ExceptionRecord->ExceptionInformation[2];
if (status != 0) error = set_nt_status_errno(status);
}
str_exception(error, "In page error");
}
}
return EXCEPTION_CONTINUE_SEARCH;
}
static void command_get_cache_client(void * x) {
GetArgs * args = (GetArgs *)x;
Channel * c = cache_channel();
Trap trap;
bbf_pos = 0;
if (set_trap(&trap)) {
int frame = 0;
Context * ctx = NULL;
RegisterDefinition * reg_def = NULL;
if (id2register(args->id, &ctx, &frame, ®_def) < 0) exception(errno);
if (ctx->exited) exception(ERR_ALREADY_EXITED);
if ((ctx->reg_access & REG_ACCESS_RD_STOP) != 0) {
check_all_stopped(ctx);
}
if ((ctx->reg_access & REG_ACCESS_RD_RUNNING) == 0) {
if (!ctx->stopped && context_has_state(ctx))
str_exception(ERR_IS_RUNNING, "Cannot read register if not stopped");
}
if (reg_def->size > bbf_len) {
bbf_len += 0x100 + reg_def->size;
bbf = (uint8_t *)loc_realloc(bbf, bbf_len);
}
bbf_pos = reg_def->size;
memset(bbf, 0, reg_def->size);
if (frame < 0 || is_top_frame(ctx, frame)) {
if (context_read_reg(ctx, reg_def, 0, reg_def->size, bbf) < 0) exception(errno);
}
else {
StackFrame * info = NULL;
if (get_frame_info(ctx, frame, &info) < 0) exception(errno);
if (read_reg_bytes(info, reg_def, 0, reg_def->size, bbf) < 0) exception(errno);
}
clear_trap(&trap);
}
cache_exit();
write_stringz(&c->out, "R");
write_stringz(&c->out, args->token);
write_errno(&c->out, trap.error);
json_write_binary(&c->out, bbf, bbf_pos);
write_stream(&c->out, 0);
write_stream(&c->out, MARKER_EOM);
}
static void generate_commands(void) {
int i;
RegisterRules * reg;
RegisterDefinition * reg_def;
reg = get_reg(&frame_regs, rules.return_address_register);
if (reg->rule != 0) {
reg_def = get_reg_by_id(rules.ctx, rules.return_address_register, &rules.reg_id_scope);
generate_register_commands(reg, get_PC_definition(rules.ctx), reg_def);
}
for (i = 0; i < frame_regs.regs_cnt; i++) {
reg = get_reg(&frame_regs, i);
if (reg->rule == 0) continue;
reg_def = get_reg_by_id(rules.ctx, i, &rules.reg_id_scope);
generate_register_commands(reg, reg_def, reg_def);
}
trace_cmds_cnt = 0;
switch (frame_regs.cfa_rule) {
case RULE_OFFSET:
reg_def = get_reg_by_id(rules.ctx, frame_regs.cfa_register, &rules.reg_id_scope);
if (reg_def != NULL) {
/* TriCore : PCXI needs to be decyphered so it will point ot the CSA
* which is an area of the memory where registers were saved.
*/
if ((rules.reg_id_scope.machine == EM_TRICORE) && (reg_def->dwarf_id == 41))
add_command(SFT_CMD_RD_REG_PCXI_TRICORE)->args.reg = reg_def;
else
add_command(SFT_CMD_RD_REG)->args.reg = reg_def;
if (frame_regs.cfa_offset != 0) {
add_command(SFT_CMD_NUMBER)->args.num = frame_regs.cfa_offset;
add_command(SFT_CMD_ADD);
}
}
break;
case RULE_EXPRESSION:
add_dwarf_expression_commands(frame_regs.cfa_expression, frame_regs.cfa_offset);
break;
default:
str_exception(ERR_INV_DWARF, "Invalid .debug_frame");
break;
}
add_command_sequence(&dwarf_stack_trace_fp, NULL);
}
static void command_set_cache_client(void * x) {
SetArgs * args = (SetArgs *)x;
Channel * c = cache_channel();
int notify = 0;
Trap trap;
if (set_trap(&trap)) {
int frame = 0;
Context * ctx = NULL;
RegisterDefinition * reg_def = NULL;
if (id2register(args->id, &ctx, &frame, ®_def) < 0) exception(errno);
if (frame >= 0 && !is_top_frame(ctx, frame)) exception(ERR_INV_CONTEXT);
if (ctx->exited) exception(ERR_ALREADY_EXITED);
if ((ctx->reg_access & REG_ACCESS_WR_STOP) != 0) {
check_all_stopped(ctx);
}
if ((ctx->reg_access & REG_ACCESS_WR_RUNNING) == 0) {
if (!ctx->stopped && context_has_state(ctx))
str_exception(ERR_IS_RUNNING, "Cannot write register if not stopped");
}
if ((size_t)args->data_len > reg_def->size) exception(ERR_INV_DATA_SIZE);
if (args->data_len > 0) {
if (context_write_reg(ctx, reg_def, 0, args->data_len, args->data) < 0) exception(errno);
notify = 1;
}
clear_trap(&trap);
}
cache_exit();
if (notify) send_event_register_changed(args->id);
write_stringz(&c->out, "R");
write_stringz(&c->out, args->token);
write_errno(&c->out, trap.error);
write_stream(&c->out, MARKER_EOM);
loc_free(args->data);
}
static U8_T read_frame_data_pointer(U1_T encoding, ELF_Section ** sec) {
U8_T v = 0;
if (encoding != EH_PE_omit) {
U8_T pos = dio_GetPos();
switch (encoding & 0xf) {
case EH_PE_absptr:
v = dio_ReadAddress(sec);
break;
case EH_PE_uleb128:
v = dio_ReadU8LEB128();
break;
case EH_PE_udata2:
v = dio_ReadU2();
break;
case EH_PE_udata4:
v = dio_ReadU4();
break;
case EH_PE_udata8:
v = dio_ReadU8();
break;
case EH_PE_sleb128:
v = dio_ReadS8LEB128();
break;
case EH_PE_sdata2:
v = (I2_T)dio_ReadU2();
break;
case EH_PE_sdata4:
v = (I4_T)dio_ReadU4();
break;
case EH_PE_sdata8:
v = (I8_T)dio_ReadU8();
break;
default:
str_exception(ERR_INV_DWARF, "Unknown encoding of .eh_frame section pointers");
break;
}
if (v != 0 && sec != NULL) {
switch ((encoding >> 4) & 0x7) {
case 0:
break;
case EH_PB_pcrel:
*sec = rules.section;
v += rules.section->addr + pos;
break;
case EH_PB_datarel:
*sec = rules.section;
v += rules.section->addr;
break;
case EH_PB_textrel:
case EH_PB_funcrel:
case EH_PB_aligned:
default:
str_exception(ERR_INV_DWARF, "Unknown encoding of .eh_frame section pointers");
break;
}
if (encoding & EH_PE_indirect) {
unsigned idx;
ELF_File * file = rules.section->file;
size_t size = rules.address_size;
U8_T res = 0;
for (idx = 1; idx < file->section_cnt; idx++) {
ELF_Section * sec = file->sections + idx;
if ((sec->flags & SHF_ALLOC) == 0) continue;
if (sec->addr <= v && sec->addr + sec->size >= v + size) {
U1_T * p;
size_t i;
if (sec->data == NULL && elf_load(sec) < 0) exception(errno);
p = (U1_T *)sec->data + (uintptr_t)(v - sec->addr);
for (i = 0; i < size; i++) {
res = (res << 8) | p[file->big_endian ? i : size - i - 1];
}
break;
}
}
v = res;
}
}
}
static void generate_register_commands(RegisterRules * reg, RegisterDefinition * dst_reg_def, RegisterDefinition * src_reg_def) {
if (dst_reg_def == NULL) return;
trace_cmds_cnt = 0;
switch (reg->rule) {
case RULE_VAL_OFFSET:
case RULE_OFFSET:
add_command(SFT_CMD_FP);
if (reg->offset != 0) {
add_command(SFT_CMD_NUMBER)->args.num = reg->offset;
add_command(SFT_CMD_ADD);
}
if (reg->rule == RULE_OFFSET) {
LocationExpressionCommand * cmd = add_command(SFT_CMD_RD_MEM);
cmd->args.mem.size = dst_reg_def->size;
if (cmd->args.mem.size > rules.address_size) cmd->args.mem.size = rules.address_size;
cmd->args.mem.big_endian = rules.reg_id_scope.big_endian;
}
break;
case RULE_SAME_VALUE:
if (src_reg_def == NULL) return;
add_command(SFT_CMD_RD_REG)->args.reg = src_reg_def;
break;
case RULE_REGISTER:
{
RegisterDefinition * src_sef = get_reg_by_id(rules.ctx, reg->offset, &rules.reg_id_scope);
if (src_sef != NULL) add_command(SFT_CMD_RD_REG)->args.reg = src_sef;
}
break;
case RULE_EXPRESSION:
case RULE_VAL_EXPRESSION:
add_command(SFT_CMD_FP);
add_dwarf_expression_commands(reg->expression, reg->offset);
if (reg->rule == RULE_EXPRESSION) {
LocationExpressionCommand * cmd = add_command(SFT_CMD_RD_MEM);
cmd->args.mem.size = dst_reg_def->size;
if (cmd->args.mem.size > rules.address_size) cmd->args.mem.size = rules.address_size;
cmd->args.mem.big_endian = rules.reg_id_scope.big_endian;
}
break;
default:
str_exception(ERR_INV_DWARF, "Invalid .debug_frame");
break;
}
if (rules.reg_id_scope.machine == EM_MICROBLAZE &&
dst_reg_def != NULL && dst_reg_def->dwarf_id == 32 &&
rules.return_address_register == 15) {
add_command(SFT_CMD_NUMBER)->args.num = 8;
add_command(SFT_CMD_ADD);
}
if (rules.reg_id_scope.machine == EM_ARM &&
dst_reg_def != NULL && dst_reg_def->dwarf_id == 15) {
add_command(SFT_CMD_NUMBER)->args.num = 0xfffffffe;
add_command(SFT_CMD_AND);
}
if (dwarf_stack_trace_regs_cnt >= trace_regs_max) {
int i;
trace_regs_max += 16;
dwarf_stack_trace_regs = (StackFrameRegisterLocation **)loc_realloc(dwarf_stack_trace_regs, trace_regs_max * sizeof(StackFrameRegisterLocation *));
for (i = dwarf_stack_trace_regs_cnt; i < trace_regs_max; i++) dwarf_stack_trace_regs[i] = NULL;
}
if (trace_cmds_cnt == 0) return;
add_command_sequence(dwarf_stack_trace_regs + dwarf_stack_trace_regs_cnt++, dst_reg_def);
}
static void add_dwarf_expression_commands(U8_T cmds_offs, U4_T cmds_size) {
dio_EnterSection(NULL, rules.section, cmds_offs);
while (dio_GetPos() < cmds_offs + cmds_size) {
U1_T op = dio_ReadU1();
switch (op) {
case OP_addr:
{
ELF_Section * section = NULL;
U8_T lt_addr = dio_ReadAddress(§ion);
ContextAddress rt_addr = elf_map_to_run_time_address(
rules.ctx, rules.section->file, section, (ContextAddress)lt_addr);
if (errno) str_exception(errno, "Cannot get object run-time address");
add_command(SFT_CMD_NUMBER)->args.num = rt_addr;
}
break;
case OP_deref:
{
LocationExpressionCommand * cmd = add_command(SFT_CMD_RD_MEM);
cmd->args.mem.size = rules.address_size;
cmd->args.mem.big_endian = rules.reg_id_scope.big_endian;
}
break;
case OP_deref_size:
{
LocationExpressionCommand * cmd = add_command(SFT_CMD_RD_MEM);
cmd->args.mem.size = dio_ReadU1();
cmd->args.mem.big_endian = rules.reg_id_scope.big_endian;
}
break;
case OP_const1u:
add_command(SFT_CMD_NUMBER)->args.num = dio_ReadU1();
break;
case OP_const1s:
add_command(SFT_CMD_NUMBER)->args.num = (I1_T)dio_ReadU1();
break;
case OP_const2u:
add_command(SFT_CMD_NUMBER)->args.num = dio_ReadU2();
break;
case OP_const2s:
add_command(SFT_CMD_NUMBER)->args.num = (I2_T)dio_ReadU2();
break;
case OP_const4u:
add_command(SFT_CMD_NUMBER)->args.num = dio_ReadU4();
break;
case OP_const4s:
add_command(SFT_CMD_NUMBER)->args.num = (I4_T)dio_ReadU4();
break;
case OP_const8u:
add_command(SFT_CMD_NUMBER)->args.num = dio_ReadU8();
break;
case OP_const8s:
add_command(SFT_CMD_NUMBER)->args.num = (I8_T)dio_ReadU8();
break;
case OP_constu:
add_command(SFT_CMD_NUMBER)->args.num = dio_ReadU8LEB128();
break;
case OP_consts:
add_command(SFT_CMD_NUMBER)->args.num = dio_ReadS8LEB128();
break;
case OP_and:
add_command(SFT_CMD_AND);
break;
case OP_minus:
add_command(SFT_CMD_SUB);
break;
case OP_or:
add_command(SFT_CMD_OR);
break;
case OP_plus:
add_command(SFT_CMD_ADD);
break;
case OP_plus_uconst:
add_command(SFT_CMD_NUMBER)->args.num = dio_ReadU8LEB128();
add_command(SFT_CMD_ADD);
break;
case OP_ge:
add_command(SFT_CMD_GE);
break;
case OP_gt:
add_command(SFT_CMD_GT);
break;
case OP_le:
add_command(SFT_CMD_LE);
break;
case OP_lt:
add_command(SFT_CMD_LT);
break;
case OP_shl:
add_command(SFT_CMD_SHL);
break;
case OP_lit0:
case OP_lit1:
case OP_lit2:
case OP_lit3:
case OP_lit4:
case OP_lit5:
case OP_lit6:
case OP_lit7:
case OP_lit8:
case OP_lit9:
case OP_lit10:
case OP_lit11:
case OP_lit12:
case OP_lit13:
case OP_lit14:
case OP_lit15:
case OP_lit16:
case OP_lit17:
case OP_lit18:
case OP_lit19:
case OP_lit20:
case OP_lit21:
case OP_lit22:
case OP_lit23:
case OP_lit24:
case OP_lit25:
case OP_lit26:
case OP_lit27:
case OP_lit28:
case OP_lit29:
case OP_lit30:
case OP_lit31:
add_command(SFT_CMD_NUMBER)->args.num = op - OP_lit0;
break;
case OP_reg0:
case OP_reg1:
case OP_reg2:
case OP_reg3:
case OP_reg4:
case OP_reg5:
case OP_reg6:
case OP_reg7:
case OP_reg8:
case OP_reg9:
case OP_reg10:
case OP_reg11:
case OP_reg12:
case OP_reg13:
case OP_reg14:
case OP_reg15:
case OP_reg16:
case OP_reg17:
case OP_reg18:
case OP_reg19:
case OP_reg20:
case OP_reg21:
case OP_reg22:
case OP_reg23:
case OP_reg24:
case OP_reg25:
case OP_reg26:
case OP_reg27:
case OP_reg28:
case OP_reg29:
case OP_reg30:
case OP_reg31:
{
RegisterDefinition * def = get_reg_by_id(rules.ctx, op - OP_reg0, &rules.reg_id_scope);
if (def == NULL) str_exception(errno, "Cannot read DWARF frame info");
add_command(SFT_CMD_RD_REG)->args.reg = def;
}
break;
case OP_regx:
{
unsigned n = (unsigned)dio_ReadULEB128();
RegisterDefinition * def = get_reg_by_id(rules.ctx, n, &rules.reg_id_scope);
if (def == NULL) str_exception(errno, "Cannot read DWARF frame info");
add_command(SFT_CMD_RD_REG)->args.reg = def;
}
break;
case OP_breg0:
case OP_breg1:
case OP_breg2:
case OP_breg3:
case OP_breg4:
case OP_breg5:
case OP_breg6:
case OP_breg7:
case OP_breg8:
case OP_breg9:
case OP_breg10:
case OP_breg11:
case OP_breg12:
case OP_breg13:
case OP_breg14:
case OP_breg15:
case OP_breg16:
case OP_breg17:
case OP_breg18:
case OP_breg19:
case OP_breg20:
case OP_breg21:
case OP_breg22:
case OP_breg23:
case OP_breg24:
case OP_breg25:
case OP_breg26:
case OP_breg27:
case OP_breg28:
case OP_breg29:
case OP_breg30:
case OP_breg31:
{
I8_T offs = dio_ReadS8LEB128();
RegisterDefinition * def = get_reg_by_id(rules.ctx, op - OP_breg0, &rules.reg_id_scope);
if (def == NULL) str_exception(errno, "Cannot read DWARF frame info");
add_command(SFT_CMD_RD_REG)->args.reg = def;
if (offs != 0) {
add_command(SFT_CMD_NUMBER)->args.num = offs;
add_command(SFT_CMD_ADD);
}
}
break;
case OP_bregx:
{
unsigned n = (unsigned)dio_ReadULEB128();
I8_T offs = dio_ReadS8LEB128();
RegisterDefinition * def = get_reg_by_id(rules.ctx, n, &rules.reg_id_scope);
if (def == NULL) str_exception(errno, "Cannot read DWARF frame info");
add_command(SFT_CMD_RD_REG)->args.reg = def;
if (offs != 0) {
add_command(SFT_CMD_NUMBER)->args.num = offs;
add_command(SFT_CMD_ADD);
}
}
break;
case OP_nop:
break;
default:
trace(LOG_ALWAYS, "Unsupported DWARF expression op 0x%02x", op);
str_exception(ERR_UNSUPPORTED, "Unsupported DWARF expression op");
}
}
}
static void exec_stack_frame_instruction(U8_T func_addr) {
RegisterRules * reg;
U1_T op = dio_ReadU1();
U4_T n;
switch (op) {
case CFA_nop:
break;
case CFA_set_loc:
rules.location = read_frame_data_pointer(rules.addr_encoding, &rules.loc_section, func_addr);
break;
case CFA_advance_loc1:
rules.location += dio_ReadU1() * rules.code_alignment;
break;
case CFA_advance_loc2:
rules.location += dio_ReadU2() * rules.code_alignment;
break;
case CFA_advance_loc4:
rules.location += dio_ReadU4() * rules.code_alignment;
break;
case CFA_offset_extended:
reg = get_reg(&frame_regs, dio_ReadULEB128());
reg->rule = RULE_OFFSET;
reg->offset = dio_ReadULEB128() * rules.data_alignment;
break;
case CFA_restore_extended:
n = dio_ReadULEB128();
reg = get_reg(&frame_regs, n);
*reg = *get_reg(&cie_regs, n);
break;
case CFA_undefined:
reg = get_reg(&frame_regs, dio_ReadULEB128());
memset(reg, 0, sizeof(*reg));
break;
case CFA_same_value:
reg = get_reg(&frame_regs, dio_ReadULEB128());
reg->rule = RULE_SAME_VALUE;
break;
case CFA_register:
reg = get_reg(&frame_regs, dio_ReadULEB128());
reg->rule = RULE_REGISTER;
reg->offset = dio_ReadULEB128();
break;
case CFA_remember_state:
copy_register_rules(get_regs_stack_item(regs_stack_pos++), &frame_regs);
break;
case CFA_restore_state:
if (regs_stack_pos <= 0) {
str_exception(ERR_INV_DWARF, "Invalid DW_CFA_restore_state instruction");
}
copy_register_rules(&frame_regs, get_regs_stack_item(--regs_stack_pos));
break;
case CFA_def_cfa:
frame_regs.cfa_rule = RULE_OFFSET;
frame_regs.cfa_register = dio_ReadULEB128();
frame_regs.cfa_offset = dio_ReadULEB128();
break;
case CFA_def_cfa_register:
frame_regs.cfa_rule = RULE_OFFSET;
frame_regs.cfa_register = dio_ReadULEB128();
break;
case CFA_def_cfa_offset:
frame_regs.cfa_rule = RULE_OFFSET;
frame_regs.cfa_offset = dio_ReadULEB128();
break;
case CFA_def_cfa_expression:
frame_regs.cfa_rule = RULE_EXPRESSION;
frame_regs.cfa_offset = dio_ReadULEB128();
frame_regs.cfa_expression = dio_GetPos();
dio_Skip(frame_regs.cfa_offset);
break;
case CFA_expression:
reg = get_reg(&frame_regs, dio_ReadULEB128());
reg->rule = RULE_EXPRESSION;
reg->offset = dio_ReadULEB128();
reg->expression = dio_GetPos();
dio_Skip(reg->offset);
break;
case CFA_offset_extended_sf:
reg = get_reg(&frame_regs, dio_ReadULEB128());
reg->rule = RULE_OFFSET;
reg->offset = dio_ReadSLEB128() * rules.data_alignment;
break;
case CFA_def_cfa_sf:
frame_regs.cfa_rule = RULE_OFFSET;
frame_regs.cfa_register = dio_ReadULEB128();
frame_regs.cfa_offset = dio_ReadSLEB128() * rules.data_alignment;
break;
case CFA_def_cfa_offset_sf:
frame_regs.cfa_rule = RULE_OFFSET;
frame_regs.cfa_offset = dio_ReadSLEB128() * rules.data_alignment;
break;
case CFA_val_offset:
reg = get_reg(&frame_regs, dio_ReadULEB128());
reg->rule = RULE_VAL_OFFSET;
reg->offset = dio_ReadULEB128() * rules.data_alignment;
break;
case CFA_val_offset_sf:
reg = get_reg(&frame_regs, dio_ReadULEB128());
reg->rule = RULE_VAL_OFFSET;
reg->offset = dio_ReadSLEB128() * rules.data_alignment;
break;
case CFA_val_expression:
reg = get_reg(&frame_regs, dio_ReadULEB128());
reg->rule = RULE_VAL_EXPRESSION;
reg->offset = dio_ReadULEB128();
reg->expression = dio_GetPos();
dio_Skip(reg->offset);
break;
case CFA_CFA_GNU_window_save:
/* SPARC-specific code */
for (n = 8; n < 16; n++) {
reg = get_reg(&frame_regs, n);
reg->rule = RULE_REGISTER;
reg->offset = n + 16;
}
for (n = 16; n < 32; n++) {
reg = get_reg(&frame_regs, n);
reg->rule = RULE_OFFSET;
reg->offset = (n - 16) * (rules.reg_id_scope.machine == EM_SPARCV9 ? 8 : 4);
}
break;
case CFA_GNU_args_size:
/* This instruction specifies the total size of the arguments
* which have been pushed onto the stack. Not used by the debugger. */
dio_ReadULEB128();
break;
case CFA_GNU_negative_offset_ext:
/* This instruction is identical to DW_CFA_offset_extended_sf
* except that the operand is subtracted to produce the offset. */
reg = get_reg(&frame_regs, dio_ReadULEB128());
reg->rule = RULE_OFFSET;
reg->offset = -dio_ReadSLEB128() * rules.data_alignment;
break;
default:
switch (op >> 6) {
case 0:
str_exception(ERR_INV_DWARF, "Unsupported instruction in Call Frame Information");
break;
case 1: /* DW_CFA_advance_loc */
rules.location += (op & 0x3f) * rules.code_alignment;
break;
case 2: /* DW_CFA_offset */
reg = get_reg(&frame_regs, op & 0x3f);
reg->rule = RULE_OFFSET;
reg->offset = dio_ReadULEB128() * rules.data_alignment;
break;
case 3: /* DW_CFA_restore */
n = op & 0x3f;
reg = get_reg(&frame_regs, n);
*reg = *get_reg(&cie_regs, n);
break;
}
}
}
static U8_T read_frame_data_pointer(U1_T encoding, ELF_Section ** sec, U8_T func_addr) {
U8_T v = 0;
U8_T pos;
unsigned idx;
ELF_File * file;
if (encoding == EH_PE_omit) return 0;
pos = dio_GetPos();
/* Decode the base or adjust the offset */
switch ((encoding >> 4) & 0x7) {
case 0:
case EH_PB_funcrel:
v = func_addr;
break;
case EH_PB_pcrel:
if (sec != NULL) {
v = pos + rules.section->addr;
}
break;
case EH_PB_datarel:
if (sec != NULL) {
v = rules.section->addr;
}
break;
case EH_PB_textrel:
if (sec != NULL && rules.text_section != NULL) {
v = rules.text_section->addr;
}
break;
case EH_PB_aligned:
if ((pos % rules.address_size) != 0) dio_SetPos(pos + (rules.address_size - (pos % rules.address_size)));
break;
default:
str_exception(ERR_INV_DWARF, "Unknown encoding of .eh_frame section pointers");
break;
}
/* Decode the value */
switch (encoding & 0xf) {
case EH_PE_absptr:
v += dio_ReadAddress(sec);
break;
case EH_PE_uleb128:
v += dio_ReadU8LEB128();
break;
case EH_PE_udata2:
v += dio_ReadAddressX(sec, 2);
break;
case EH_PE_udata4:
v += dio_ReadAddressX(sec, 4);
break;
case EH_PE_udata8:
v += dio_ReadAddressX(sec, 8);
break;
case EH_PE_sleb128:
v += dio_ReadS8LEB128();
break;
case EH_PE_sdata2:
v += (I2_T)dio_ReadAddressX(sec, 2);
break;
case EH_PE_sdata4:
v += (I4_T)dio_ReadAddressX(sec, 4);
break;
case EH_PE_sdata8:
v += (I8_T)dio_ReadAddressX(sec, 8);
break;
default:
str_exception(ERR_INV_DWARF, "Unknown encoding of .eh_frame section pointers");
break;
}
if (encoding & EH_PE_indirect) {
size_t size = rules.address_size;
U8_T res = 0;
file = rules.section->file;
for (idx = 1; idx < file->section_cnt; idx++) {
ELF_Section * sec = file->sections + idx;
if ((sec->flags & SHF_ALLOC) == 0) continue;
if (sec->addr <= v && sec->addr + sec->size >= v + size) {
U1_T * p;
size_t i;
if (sec->data == NULL && elf_load(sec) < 0) exception(errno);
p = (U1_T *)sec->data + (uintptr_t)(v - sec->addr);
for (i = 0; i < size; i++) {
res = (res << 8) | p[file->big_endian ? i : size - i - 1];
}
break;
}
}
v = res;
}
return v;
}
static void relocate(void * r) {
ElfRelocateFunc * func;
if (!relocs->file->elf64) {
if (relocs->type == SHT_REL) {
Elf32_Rel bf = *(Elf32_Rel *)r;
if (relocs->file->byte_swap) {
SWAP(bf.r_offset);
SWAP(bf.r_info);
}
sym_index = ELF32_R_SYM(bf.r_info);
reloc_type = ELF32_R_TYPE(bf.r_info);
reloc_addend = 0;
}
else {
Elf32_Rela bf = *(Elf32_Rela *)r;
if (relocs->file->byte_swap) {
SWAP(bf.r_offset);
SWAP(bf.r_info);
SWAP(bf.r_addend);
}
sym_index = ELF32_R_SYM(bf.r_info);
reloc_type = ELF32_R_TYPE(bf.r_info);
reloc_addend = bf.r_addend;
}
if (sym_index != STN_UNDEF) {
Elf32_Sym bf = ((Elf32_Sym *)symbols->data)[sym_index];
if (symbols->file->byte_swap) {
SWAP(bf.st_name);
SWAP(bf.st_value);
SWAP(bf.st_size);
SWAP(bf.st_info);
SWAP(bf.st_other);
SWAP(bf.st_shndx);
}
switch (bf.st_shndx) {
case SHN_ABS:
sym_value = bf.st_value;
break;
case SHN_COMMON:
str_exception(ERR_INV_FORMAT, "Common relocation record unsupported");
break;
case SHN_UNDEF:
str_exception(ERR_INV_FORMAT, "Invalid relocation record");
break;
default:
if (bf.st_shndx >= symbols->file->section_cnt) str_exception(ERR_INV_FORMAT, "Invalid relocation record");
if (symbols->file->type != ET_EXEC) {
sym_value = (symbols->file->sections + bf.st_shndx)->addr + bf.st_value;
}
else {
sym_value = bf.st_value;
}
*destination_section = symbols->file->sections + bf.st_shndx;
break;
}
}
}
else {
if (relocs->type == SHT_REL) {
Elf64_Rel bf = *(Elf64_Rel *)r;
if (relocs->file->byte_swap) {
SWAP(bf.r_offset);
SWAP(bf.r_info);
}
sym_index = ELF64_R_SYM(bf.r_info);
reloc_type = ELF64_R_TYPE(bf.r_info);
reloc_addend = 0;
}
else {
Elf64_Rela bf = *(Elf64_Rela *)r;
if (relocs->file->byte_swap) {
SWAP(bf.r_offset);
SWAP(bf.r_info);
SWAP(bf.r_addend);
}
sym_index = ELF64_R_SYM(bf.r_info);
reloc_type = ELF64_R_TYPE(bf.r_info);
reloc_addend = bf.r_addend;
}
if (sym_index != STN_UNDEF) {
Elf64_Sym bf = ((Elf64_Sym *)symbols->data)[sym_index];
if (symbols->file->byte_swap) {
SWAP(bf.st_name);
SWAP(bf.st_value);
SWAP(bf.st_size);
SWAP(bf.st_info);
SWAP(bf.st_other);
SWAP(bf.st_shndx);
}
switch (bf.st_shndx) {
case SHN_ABS:
sym_value = bf.st_value;
break;
case SHN_COMMON:
str_exception(ERR_INV_FORMAT, "Common relocation record unsupported");
break;
case SHN_UNDEF:
str_exception(ERR_INV_FORMAT, "Invalid relocation record");
break;
default:
if (bf.st_shndx >= symbols->file->section_cnt) str_exception(ERR_INV_FORMAT, "Invalid relocation record");
if (symbols->file->type != ET_EXEC) {
sym_value = (symbols->file->sections + bf.st_shndx)->addr + bf.st_value;
}
else {
sym_value = bf.st_value;
}
*destination_section = symbols->file->sections + bf.st_shndx;
break;
}
}
}
/* For executable file we don't need to apply the relocation,
* all we need is destination_section */
if (section->file->type != ET_REL) return;
func = elf_relocate_funcs;
while (func->machine != section->file->machine) {
if (func->func == NULL) str_exception(ERR_INV_FORMAT, "Unsupported ELF machine code");
func++;
}
func->func();
}
int elf_enumerate_symbols (Context * ctx, const char * file_name, EnumerateSymbols ** enum_syms, EnumerateBatchSymbolsCallBack * call_back, void * args) {
Trap trap;
ELF_File * file;
unsigned sec_idx;
int has_more = 0;
if (!set_trap(&trap)) {
loc_free (*enum_syms);
*enum_syms = NULL;
return -1;
}
if (ctx == NULL && file_name == NULL) {
assert (*enum_syms != NULL);
file = elf_open ((*enum_syms)->file_name);
if (file == NULL) exception (errno);
/*
* Check that the file is identical to the initial file and the context
* still exists.
*/
if (file->ino != (*enum_syms)->ino || file->dev != (*enum_syms)->dev || file->mtime != (*enum_syms)->mtime) {
str_exception(ERR_OTHER, "The elf symbol file has changed");
}
else {
ctx = id2ctx((*enum_syms)->ctxId);
if (ctx == NULL) exception (ERR_INV_CONTEXT);
else if (ctx->exited) exception (ERR_ALREADY_EXITED);
}
sec_idx = (*enum_syms)->sec_idx;
}
else {
unsigned symtab_idx = 0;
unsigned dynsym_idx = 0;
unsigned ix;
assert (file_name != NULL && enum_syms != NULL && *enum_syms == NULL);
file = elf_open (file_name);
if (file == NULL) exception (errno);
if (file->sections == NULL) str_exception(ERR_OTHER, "The file does not have sections");
/* Look for the symbol table sections */
for (ix = 0; ix < file->section_cnt && (symtab_idx == 0 || dynsym_idx == 0); ix++) {
ELF_Section * sec = file->sections + ix;
if (sec->type == SHT_SYMTAB) symtab_idx = ix;
else if (sec->type == SHT_DYNSYM) dynsym_idx = ix;
}
if (symtab_idx == 0 && dynsym_idx == 0) str_exception(ERR_OTHER, "The file does not have a symbol table");
/* Set priority to the symbol table */
if (symtab_idx != 0) sec_idx = symtab_idx;
else sec_idx = dynsym_idx;
*enum_syms = (EnumerateSymbols *)loc_alloc_zero (sizeof (EnumerateSymbols));
strlcpy ((*enum_syms)->file_name, file_name, sizeof ((*enum_syms)->file_name));
if (strlen (file_name) != strlen ((*enum_syms)->file_name)) str_exception (ERR_OTHER, "File pathname too long");
strlcpy ((*enum_syms)->ctxId, ctx->id, sizeof ((*enum_syms)->ctxId));
(*enum_syms)->dev = file->dev;
(*enum_syms)->ino = file->ino;
(*enum_syms)->mtime = file->mtime;
(*enum_syms)->sec_idx = sec_idx;
}
has_more = enumerate_symbol_table(ctx, file->sections + sec_idx, *enum_syms, call_back, args);
clear_trap(&trap);
if (has_more == 0) {
loc_free (*enum_syms);
*enum_syms = NULL;
}
return has_more;
}
void load_line_numbers(DWARFCache * Cache, CompUnit * Unit) {
Trap trap;
if (Unit->mFiles != NULL && Unit->mDirs != NULL) return;
if (elf_load(Cache->mDebugLine)) exception(errno);
dio_EnterDataSection(&Unit->mDesc, Cache->mDebugLine->data, Unit->mLineInfoOffs, Cache->mDebugLine->size);
if (set_trap(&trap)) {
U8_T header_pos = 0;
U1_T opcode_base = 0;
U1_T opcode_size[256];
U8_T header_size = 0;
U1_T min_instruction_length = 0;
U1_T is_stmt_default = 0;
I1_T line_base = 0;
U1_T line_range = 0;
U8_T unit_size = 0;
int dwarf64 = 0;
LineNumbersState state;
/* Read header */
unit_size = dio_ReadU4();
if (unit_size == 0xffffffffu) {
unit_size = dio_ReadU8();
unit_size += 12;
dwarf64 = 1;
}
else {
unit_size += 4;
}
dio_ReadU2(); /* line info version */
header_size = dwarf64 ? dio_ReadU8() : (U8_T)dio_ReadU4();
header_pos = dio_GetPos();
min_instruction_length = dio_ReadU1();
is_stmt_default = dio_ReadU1() != 0;
line_base = (I1_T)dio_ReadU1();
line_range = dio_ReadU1();
opcode_base = dio_ReadU1();
memset(opcode_size, 0, sizeof(opcode_size));
dio_Read(opcode_size + 1, opcode_base - 1);
/* Read directory names */
for (;;) {
char * Name = dio_ReadString();
if (Name == NULL) break;
add_dir(Unit, Name);
}
/* Read source sFileLocks info */
for (;;) {
U4_T dir = 0;
FileInfo File;
memset(&File, 0, sizeof(File));
File.mName = dio_ReadString();
if (File.mName == NULL) break;
dir = dio_ReadULEB128();
if (dir > 0 && dir <= Unit->mDirsCnt) File.mDir = Unit->mDirs[dir - 1];
File.mModTime = dio_ReadULEB128();
File.mSize = dio_ReadULEB128();
add_file(Unit, &File);
}
/* Run the program */
if (header_pos + header_size != dio_GetPos())
str_exception(ERR_INV_DWARF, "Invalid line info header");
memset(&state, 0, sizeof(state));
state.mFile = 1;
state.mLine = 1;
if (is_stmt_default) state.mFlags |= LINE_IsStmt;
while (dio_GetPos() < Unit->mLineInfoOffs + unit_size) {
U1_T opcode = dio_ReadU1();
if (opcode >= opcode_base) {
state.mLine += (unsigned)((int)((opcode - opcode_base) % line_range) + line_base);
state.mAddress += (opcode - opcode_base) / line_range * min_instruction_length;
add_state(Unit, &state);
state.mFlags &= ~(LINE_BasicBlock | LINE_PrologueEnd | LINE_EpilogueBegin);
}
else if (opcode == 0) {
U4_T op_size = dio_ReadULEB128();
U8_T op_pos = dio_GetPos();
switch (dio_ReadU1()) {
case DW_LNE_define_file: {
U4_T dir = 0;
FileInfo File;
memset(&File, 0, sizeof(File));
File.mName = dio_ReadString();
dir = dio_ReadULEB128();
if (dir > 0 && dir <= Unit->mDirsCnt) File.mDir = Unit->mDirs[dir - 1];
File.mModTime = dio_ReadULEB128();
File.mSize = dio_ReadULEB128();
add_file(Unit, &File);
break;
}
case DW_LNE_end_sequence:
state.mFlags |= LINE_EndSequence;
add_state(Unit, &state);
memset(&state, 0, sizeof(state));
state.mFile = 1;
state.mLine = 1;
if (is_stmt_default) state.mFlags |= LINE_IsStmt;
else state.mFlags &= ~LINE_IsStmt;
break;
case DW_LNE_set_address:
state.mAddress = (ContextAddress)dio_ReadAddress();
break;
default:
dio_Skip(op_size - 1);
break;
}
if (dio_GetPos() != op_pos + op_size)
str_exception(ERR_INV_DWARF, "Invalid line info op size");
}
else {
switch (opcode) {
case DW_LNS_copy:
add_state(Unit, &state);
state.mFlags &= ~(LINE_BasicBlock | LINE_PrologueEnd | LINE_EpilogueBegin);
break;
case DW_LNS_advance_pc:
state.mAddress += (ContextAddress)(dio_ReadU8LEB128() * min_instruction_length);
break;
case DW_LNS_advance_line:
state.mLine += dio_ReadSLEB128();
break;
case DW_LNS_set_file:
state.mFile = dio_ReadULEB128();
break;
case DW_LNS_set_column:
state.mColumn = dio_ReadULEB128();
break;
case DW_LNS_negate_stmt:
state.mFlags ^= LINE_IsStmt;
break;
case DW_LNS_set_basic_block:
state.mFlags |= LINE_BasicBlock;
break;
case DW_LNS_const_add_pc:
state.mAddress += (255 - opcode_base) / line_range * min_instruction_length;
break;
case DW_LNS_fixed_advance_pc:
state.mAddress += dio_ReadU2();
break;
case DW_LNS_set_prologue_end:
state.mFlags |= LINE_PrologueEnd;
break;
case DW_LNS_set_epilogue_begin:
state.mFlags |= LINE_EpilogueBegin;
break;
case DW_LNS_set_isa:
state.mISA = (U1_T)dio_ReadULEB128();
break;
default:
str_exception(ERR_INV_DWARF, "Invalid line info op code");
break;
}
}
}
dio_ExitSection();
clear_trap(&trap);
}
else {
dio_ExitSection();
free_unit_cache(Unit);
str_exception(trap.error, trap.msg);
}
}
static void read_frame_cie(U8_T fde_pos, U8_T pos) {
int cie_dwarf64 = 0;
U8_T saved_pos = dio_GetPos();
U8_T cie_length = 0;
U8_T cie_end = 0;
rules.cie_pos = pos;
if (pos >= rules.section->size) {
str_fmt_exception(ERR_INV_DWARF,
"Invalid CIE pointer 0x%" PRIX64
" in FDE at 0x%" PRIX64, pos, fde_pos);
}
dio_SetPos(pos);
cie_length = dio_ReadU4();
if (cie_length == ~(U4_T)0) {
cie_length = dio_ReadU8();
cie_dwarf64 = 1;
}
cie_end = dio_GetPos() + cie_length;
dio_Skip(cie_dwarf64 ? 8 : 4);
rules.version = dio_ReadU1();
if (rules.version != 1 && rules.version != 3 && rules.version != 4) {
str_fmt_exception(ERR_INV_DWARF,
"Unsupported version of Call Frame Information: %d", rules.version);
}
rules.cie_aug = dio_ReadString();
if (rules.cie_aug != NULL && strcmp(rules.cie_aug, "eh") == 0) {
rules.cie_eh_data = dio_ReadAddress(&rules.cie_eh_data_section);
}
if (rules.version >= 4) {
rules.address_size = dio_ReadU1();
rules.segment_size = dio_ReadU1();
}
else {
rules.address_size = rules.section->file->elf64 ? 8 : 4;
rules.segment_size = 0;
}
if (rules.segment_size != 0) {
str_exception(ERR_INV_DWARF,
"Unsupported Call Frame Information: segment size != 0");
}
rules.code_alignment = dio_ReadULEB128();
rules.data_alignment = dio_ReadSLEB128();
rules.return_address_register = dio_ReadULEB128();
rules.lsda_encoding = 0;
rules.prh_encoding = 0;
rules.addr_encoding = 0;
if (rules.cie_aug != NULL && rules.cie_aug[0] == 'z') {
U4_T aug_length = dio_ReadULEB128();
U8_T aug_pos = dio_GetPos();
char * p = rules.cie_aug + 1;
while (*p) {
switch (*p++) {
case 'L':
rules.lsda_encoding = dio_ReadU1();
break;
case 'P':
{
Trap trap;
U8_T addr_pos;
rules.prh_encoding = dio_ReadU1();
addr_pos = dio_GetPos();
if (set_trap(&trap)) {
read_frame_data_pointer(rules.prh_encoding, NULL, 0);
clear_trap(&trap);
}
else {
dio_SetPos(addr_pos + rules.address_size);
}
}
break;
case 'R':
rules.addr_encoding = dio_ReadU1();
break;
}
}
dio_SetPos(aug_pos + aug_length);
}
clear_frame_registers(&cie_regs);
clear_frame_registers(&frame_regs);
regs_stack_pos = 0;
while (dio_GetPos() < cie_end) {
exec_stack_frame_instruction(0);
}
copy_register_rules(&cie_regs, &frame_regs);
dio_SetPos(saved_pos);
}
static void stack_trace_error(void) {
str_exception(ERR_OTHER, "Invalid stack trace program");
}
void drl_relocate(ELF_Section * s, U8_T offset, void * buf, size_t size, ELF_Section ** dst) {
unsigned i;
ELF_Section * d = NULL;
if (dst == NULL) dst = &d;
else *dst = NULL;
if (!s->relocate) return;
section = s;
destination_section = dst;
reloc_offset = offset;
data_buf = buf;
data_size = size;
for (i = 1; i < s->file->section_cnt; i++) {
ELF_Section * r = s->file->sections + i;
if (r->size == 0) continue;
if (r->type != SHT_REL && r->type != SHT_RELA) continue;
if (r->info == s->index) {
uint8_t * p;
uint8_t * q;
unsigned ix;
relocs = r;
symbols = s->file->sections + r->link;
if (elf_load(relocs) < 0) exception(errno);
if (elf_load(symbols) < 0) exception(errno);
if (r->entsize == 0 || r->size % r->entsize != 0) str_exception(ERR_INV_FORMAT, "Invalid sh_entsize");
if (r->reloc_num_zones == 0) {
U8_T prev_offs = 0;
unsigned max_bondaries = 2; /* default is two bondaries ... */
r->reloc_num_zones = 1; /* ... for one zone */
r->reloc_zones_bondaries = (unsigned *)loc_alloc_zero(sizeof (unsigned) * max_bondaries);
r->reloc_zones_bondaries[0] = 0; /* first zone starting index */
for (ix = 0; ix < r->size / r->entsize; ix++) {
U8_T offs;
uint8_t * x = (uint8_t *)r->data + ix * r->entsize;
if (r->file->elf64) {
offs = *(U8_T *)x;
if (r->file->byte_swap) SWAP(offs);
}
else {
U4_T offs4 = *(U4_T *)x;
if (r->file->byte_swap) SWAP(offs4);
offs = offs4;
}
if (offs < prev_offs) {
/*
* Relocation offsets are not ordered. Store the start
* index of the new zone.
*/
if ((r->reloc_num_zones + 1) == max_bondaries) {
max_bondaries += 5;
r->reloc_zones_bondaries =
(unsigned *)loc_realloc(r->reloc_zones_bondaries,
sizeof (unsigned) * max_bondaries);
}
r->reloc_zones_bondaries[r->reloc_num_zones++] = ix;
}
prev_offs = offs;
}
/* Store the last zone boundary index */
r->reloc_zones_bondaries[r->reloc_num_zones] = ix;
if (r->reloc_num_zones > 1) {
trace(LOG_ELF, "ELF relocations are not ordered; the performances "\
"may be degraded.");
}
/*
* As we parsed the relocation section, it would be possible to
* localize the searched offset at the same time, to optimize the
* first lookup. But I don't know if it worth it, compare to some
* code duplication with the rest of the routine below.
*/
}
/* Perform a dichotomic look up for each ordered area */
for (ix = 0; ix < r->reloc_num_zones; ix++) {
p = (uint8_t *)r->data + r->reloc_zones_bondaries[ix] * r->entsize;
q = (uint8_t *)r->data + r->reloc_zones_bondaries[ix + 1] * r->entsize;
while (p < q) {
unsigned n = (q - p) / r->entsize / 2;
uint8_t * x = p + n * r->entsize;
assert(x < q);
if (r->file->elf64) {
U8_T offs = *(U8_T *)x;
if (r->file->byte_swap) SWAP(offs);
if (s->file->type != ET_REL) offs -= s->addr;
if (offset > offs) {
p = x + r->entsize;
continue;
}
if (offset < offs) {
q = x;
continue;
}
}
else {
U4_T offs = *(U4_T *)x;
if (r->file->byte_swap) SWAP(offs);
if (s->file->type != ET_REL) offs -= (U4_T)s->addr;
if (offset > offs) {
p = x + r->entsize;
continue;
}
if (offset < offs) {
q = x;
continue;
}
}
relocate(x);
return;
}
}
}
}
}
