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beterr DWARF expressions logging, trying to get CFI info for registers

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This commit is contained in:
nnosov
2020-01-05 12:29:18 +04:00
parent 1f3a6237ac
commit 83fc2bc3ef
2 changed files with 72 additions and 57 deletions
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framework/sysutils.cpp
+70 -56
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@@ -23,7 +23,8 @@ extern SC_LogBase* logger;
char __stack_trace[8192];
Dwarf_Frame* frame;
Dwarf_Frame* frame = 0;
Dwarf_Frame* prev_frame = 0;
Dwfl_Module* module;
// dwfl_addrsegment() possibly can be used to check address validity
@@ -163,18 +164,44 @@ void HandleType(Dwarf_Attribute* param, bool is_return = false)
}
}
void
print_expr_block (Dwarf_Attribute *attr, Dwarf_Op *exprs, int len,
Dwarf_Addr addr, int depth)
void print_framereg(int regno)
{
printf ("{");
for (int i = 0; i < len; i++)
{
printf ("%s", (i + 1 < len ? ", " : ""));
}
printf ("}");
Dwarf_Op ops_mem[3];
Dwarf_Op* ops;
size_t nops;
int ret = dwarf_frame_register(frame, regno, ops_mem, &ops, &nops);
if(ret != 0) {
logger->Log(SEVERITY_DEBUG, "Failed to get CFI expression for register 0x%hhX", regno);
return;
}
if(nops == 0 && ops == ops_mem) {
logger->Log(SEVERITY_DEBUG, "CFI expression for register 0x%hhX is UNDEFINED", regno);
return;
}
if(nops == 0 && ops == NULL) {
logger->Log(SEVERITY_DEBUG, "CFI expression for register 0x%hhX is SAME VALUE", regno);
return;
}
logger->Log(SEVERITY_DEBUG, "Found CFI expression for register 0x%hhX, number of expressions: %d", regno, nops);
for(size_t i = 0; i < nops; ++i) {
logger->Log(SEVERITY_DEBUG, "\t[%d] operation: 0x%hhX, operand1: 0x%lX, operand2: 0x%lx, offset: 0x%lX", i, ops[i].atom, ops[i].number, ops[i].number2, ops[i].offset);
}
}
void
print_expr_block (Dwarf_Op *exprs, int len, char* buff, uint32_t buff_size)
{
uint32_t offset = 0;
for (int i = 0; i < len; i++) {
//printf ("%s", (i + 1 < len ? ", " : ""));
offset += snprintf(buff + offset, buff_size - offset, "0x%hhX(0x%lX, 0x%lx) ", exprs[i].atom, exprs[i].number, exprs[i].number2);
if(exprs[i].atom >= DW_OP_reg0 && exprs[i].atom <= DW_OP_bregx) {
print_framereg(exprs[i].atom);
}
}
}
void HandleParameter(Dwarf_Die* result)
{
Dwarf_Attribute attr_mem;
@@ -190,56 +217,35 @@ void HandleParameter(Dwarf_Die* result)
// determine location of parameter in stack/heap or CPU registers
attr = dwarf_attr(result, DW_AT_location, &attr_mem);
if(attr) {
logger->Log(SEVERITY_DEBUG, "parameter location attribute form = 0x%X, code = 0x%X", attr->form, attr->code);
if(dwarf_hasform(attr, DW_FORM_exprloc)) {
Dwarf_Op *expr;
size_t exprlen;
if (dwarf_getlocation(attr, &expr, &exprlen) == 0) {
logger->Log(SEVERITY_DEBUG, "Found DW_AT_location expression");
print_detail(0, expr, exprlen, 0, "\tLocation ");
char str[1024]; str[0] = 0;
print_expr_block (expr, exprlen, str, sizeof(str));
logger->Log(SEVERITY_DEBUG, "Found DW_AT_location expression: %s", str);
if(expr[0].atom >= DW_OP_reg0 && expr[0].atom <= DW_OP_bregx) {
Dwarf_Op ops_mem[3];
Dwarf_Op* ops;
size_t nops;
int ret = dwarf_frame_register(frame, expr[0].atom, ops_mem, &ops, &nops);
if(ret != 0) {
logger->Log(SEVERITY_DEBUG, "Failed to get CFI expression for register 0x%hhX", expr[0].atom);
return;
}
if(nops == 0 && ops == ops_mem) {
logger->Log(SEVERITY_DEBUG, "CFI expression for register 0x%hhX is UNDEFINED", expr[0].atom);
return;
}
if(nops == 0 && ops == NULL) {
logger->Log(SEVERITY_DEBUG, "CFI expression for register 0x%hhX is SAME VALUE", expr[0].atom);
return;
}
logger->Log(SEVERITY_DEBUG, "Found CFI expression for register 0x%hhX, number of expressions: %d", expr[0].atom, nops);
for(size_t i = 0; i < nops; ++i) {
logger->Log(SEVERITY_DEBUG, "\t[%d] operation: 0x%hhX, operand1: 0x%lX, operand2: 0x%lx, offset: 0x%lX", i, ops[i].atom, ops[i].number, ops[i].number2, ops[i].offset);
}
print_framereg(expr[0].atom);
}
}
} else if(dwarf_hasform(attr, DW_FORM_sec_offset)) {
Dwarf_Addr base, start, end;
ptrdiff_t off = 0;
Dwarf_Op *fb_expr;
size_t fb_exprlen;
while ((off = dwarf_getlocations (attr, off, &base, &start, &end, &fb_expr, &fb_exprlen)) > 0) {
printf (" (%" PRIx64 ",%" PRIx64 ") ", start, end);
print_expr_block (attr, fb_expr, fb_exprlen, start, 0);
printf ("\n");
}
Dwarf_Op *expr;
size_t exprlen;
Dwarf_Word value;
int ret = dwarf_formudata(attr, &value);
if(ret >= 0) {
logger->Log(SEVERITY_DEBUG, "Found DW_AT_location offset = 0x%lX", value);
if(ret < 0) {
logger->Log(SEVERITY_ERROR, "Cannot get DW_AT_location offset");
}
for(int i = 0; (off = dwarf_getlocations (attr, off, &base, &start, &end, &expr, &exprlen)) > 0; ++i) {
char str[1024]; str[0] = 0;
print_expr_block (expr, exprlen, str, sizeof(str));
logger->Log(SEVERITY_DEBUG, "[%d] low_offset: %" PRIx64 ", high_offset: %" PRIx64 ", .debug_locations section offset: 0x%lX ==> %s", i, start, end, value, str);
}
} else {
logger->Log(SEVERITY_WARNING, "Unknown attribute form = 0x%X, code = 0x%X", attr->form, attr->code);
logger->Log(SEVERITY_WARNING, "Unknown attribute form = 0x%X, code = 0x%X, ", attr->form, attr->code);
}
}
@@ -260,8 +266,10 @@ void HandleFunction(Dwarf_Die* func, const char* fname)
Dwarf_Op *expr;
size_t exprlen;
if (dwarf_getlocation (attr, &expr, &exprlen) == 0) {
logger->Log(SEVERITY_DEBUG, "Found DW_AT_framebase expression");
print_detail(0, expr, exprlen, 0, "\tLocation ");
char str[1024]; str[0] = 0;
print_expr_block (expr, exprlen, str, sizeof(str));
logger->Log(SEVERITY_DEBUG, "Found DW_AT_framebase expression: %s", str);
//print_detail(0, expr, exprlen, 0, "\tLocation ");
} else {
logger->Log(SEVERITY_WARNING, "Unknown attribute form = 0x%X, code = 0x%X", attr->form, attr->code);
}
@@ -329,10 +337,10 @@ static void print_detail (int result, const Dwarf_Op *ops, size_t nops, Dwarf_Ad
void HandleCompilationUnit(Dwfl_Module* module, Dwarf_Addr addr, const char* fname)
{
Dwarf_Addr mod_bias = 0;
// get function debug definition
Dwarf_Die* cdie = dwfl_module_addrdie(module, addr, &mod_bias);
logger->Log(SEVERITY_DEBUG, "Function bias in module is 0x%lX", mod_bias);
Dwarf_Addr mod_cu = 0;
// get CU(Compilation Unit) debug definition
Dwarf_Die* cdie = dwfl_module_addrdie(module, addr, &mod_cu);
logger->Log(SEVERITY_DEBUG, "Function bias in module is 0x%lX", mod_cu);
//Dwarf_Die* cdie = dwfl_addrdie(dwfl, addr, &mod_bias);
if(!cdie) {
logger->Log(SEVERITY_INFO, "Failed to find DWARF DIE for address %X", addr);
@@ -341,10 +349,15 @@ void HandleCompilationUnit(Dwfl_Module* module, Dwarf_Addr addr, const char* fna
// get CFI (Call Frame Information) for current module
// from handle_cfi()
Dwarf_Addr mod_bias = 0;
Dwarf_CFI* cfi = dwfl_module_eh_cfi(module, &mod_bias);
//Dwarf_CFI* cfi = dwfl_module_dwarf_cfi(module, &mod_bias);
if(cfi) {
// get frame of CFI for address
logger->Log(SEVERITY_INFO, "Found CFI for module %s", dwarf_diename(cdie));
if(frame) {
prev_frame = frame;
}
int result = dwarf_cfi_addrframe (cfi, addr - mod_bias, &frame);
if (result == 0) {
// get frame information
@@ -353,8 +366,7 @@ void HandleCompilationUnit(Dwfl_Module* module, Dwarf_Addr addr, const char* fna
Dwarf_Addr end = addr;
bool signalp;
int ra_regno = dwarf_frame_info (frame, &start, &end, &signalp);
if (ra_regno >= 0)
{
if(ra_regno >= 0) {
start += mod_bias;
end += mod_bias;
}
@@ -374,8 +386,10 @@ void HandleCompilationUnit(Dwfl_Module* module, Dwarf_Addr addr, const char* fna
Dwarf_Op *cfa_ops = &dummy;
size_t cfa_nops;
result = dwarf_frame_cfa(frame, &cfa_ops, &cfa_nops);
print_detail (result, cfa_ops, cfa_nops, mod_bias, "\tCFA ");
char str[1024]; str[0] = 0;
print_expr_block (cfa_ops, cfa_nops, str, sizeof(str));
logger->Log(SEVERITY_INFO, "Found CFA expression: %s", str);
//print_detail (result, cfa_ops, cfa_nops, mod_bias, "\tCFA ");
}
}