4538ed3b85
Summary:
This patch fixes issues with a stack realignment.
MSVC maintains two frame pointers (`ebx` and `ebp`) for a realigned stack - one
is used for access to function parameters, while another is used for access to
locals. To support this the patch:
- adds an alternative frame pointer (`ebx`);
- considers stack realignment instructions (e.g. `and esp, -32`);
- along with CFA (Canonical Frame Address) which point to the position next to
the saved return address (or to the first parameter on the stack) introduces
AFA (Aligned Frame Address) which points to the position of the stack pointer
right after realignment. AFA is used for access to registers saved after the
realignment (see the test);
Here is an example of the code with the realignment:
```
struct __declspec(align(256)) OverAligned {
char c;
};
void foo(int foo_arg) {
OverAligned oa_foo = { 1 };
auto aaa_foo = 1234;
}
void bar(int bar_arg) {
OverAligned oa_bar = { 2 };
auto aaa_bar = 5678;
foo(1111);
}
int main() {
bar(2222);
return 0;
}
```
and here is the `bar` disassembly:
```
push ebx
mov ebx, esp
sub esp, 8
and esp, -100h
add esp, 4
push ebp
mov ebp, [ebx+4]
mov [esp+4], ebp
mov ebp, esp
sub esp, 200h
mov byte ptr [ebp-200h], 2
mov dword ptr [ebp-4], 5678
push 1111 ; foo_arg
call j_?foo@@YAXH@Z ; foo(int)
add esp, 4
mov esp, ebp
pop ebp
mov esp, ebx
pop ebx
retn
```
Reviewers: labath, zturner, jasonmolenda, stella.stamenova
Reviewed By: jasonmolenda
Subscribers: abidh, lldb-commits
Tags: #lldb
Differential Revision: https://reviews.llvm.org/D53435
llvm-svn: 345577
535 lines
16 KiB
C++
535 lines
16 KiB
C++
//===-- UnwindPlan.cpp ----------------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "lldb/Symbol/UnwindPlan.h"
|
|
|
|
#include "lldb/Target/Process.h"
|
|
#include "lldb/Target/RegisterContext.h"
|
|
#include "lldb/Target/Thread.h"
|
|
#include "lldb/Utility/ConstString.h"
|
|
#include "lldb/Utility/Log.h"
|
|
|
|
using namespace lldb;
|
|
using namespace lldb_private;
|
|
|
|
bool UnwindPlan::Row::RegisterLocation::
|
|
operator==(const UnwindPlan::Row::RegisterLocation &rhs) const {
|
|
if (m_type == rhs.m_type) {
|
|
switch (m_type) {
|
|
case unspecified:
|
|
case undefined:
|
|
case same:
|
|
return true;
|
|
|
|
case atCFAPlusOffset:
|
|
case isCFAPlusOffset:
|
|
case atAFAPlusOffset:
|
|
case isAFAPlusOffset:
|
|
return m_location.offset == rhs.m_location.offset;
|
|
|
|
case inOtherRegister:
|
|
return m_location.reg_num == rhs.m_location.reg_num;
|
|
|
|
case atDWARFExpression:
|
|
case isDWARFExpression:
|
|
if (m_location.expr.length == rhs.m_location.expr.length)
|
|
return !memcmp(m_location.expr.opcodes, rhs.m_location.expr.opcodes,
|
|
m_location.expr.length);
|
|
break;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// This function doesn't copy the dwarf expression bytes; they must remain in
|
|
// allocated memory for the lifespan of this UnwindPlan object.
|
|
void UnwindPlan::Row::RegisterLocation::SetAtDWARFExpression(
|
|
const uint8_t *opcodes, uint32_t len) {
|
|
m_type = atDWARFExpression;
|
|
m_location.expr.opcodes = opcodes;
|
|
m_location.expr.length = len;
|
|
}
|
|
|
|
// This function doesn't copy the dwarf expression bytes; they must remain in
|
|
// allocated memory for the lifespan of this UnwindPlan object.
|
|
void UnwindPlan::Row::RegisterLocation::SetIsDWARFExpression(
|
|
const uint8_t *opcodes, uint32_t len) {
|
|
m_type = isDWARFExpression;
|
|
m_location.expr.opcodes = opcodes;
|
|
m_location.expr.length = len;
|
|
}
|
|
|
|
void UnwindPlan::Row::RegisterLocation::Dump(Stream &s,
|
|
const UnwindPlan *unwind_plan,
|
|
const UnwindPlan::Row *row,
|
|
Thread *thread,
|
|
bool verbose) const {
|
|
switch (m_type) {
|
|
case unspecified:
|
|
if (verbose)
|
|
s.PutCString("=<unspec>");
|
|
else
|
|
s.PutCString("=!");
|
|
break;
|
|
case undefined:
|
|
if (verbose)
|
|
s.PutCString("=<undef>");
|
|
else
|
|
s.PutCString("=?");
|
|
break;
|
|
case same:
|
|
s.PutCString("= <same>");
|
|
break;
|
|
|
|
case atCFAPlusOffset:
|
|
case isCFAPlusOffset: {
|
|
s.PutChar('=');
|
|
if (m_type == atCFAPlusOffset)
|
|
s.PutChar('[');
|
|
s.Printf("CFA%+d", m_location.offset);
|
|
if (m_type == atCFAPlusOffset)
|
|
s.PutChar(']');
|
|
} break;
|
|
|
|
case atAFAPlusOffset:
|
|
case isAFAPlusOffset: {
|
|
s.PutChar('=');
|
|
if (m_type == atAFAPlusOffset)
|
|
s.PutChar('[');
|
|
s.Printf("AFA%+d", m_location.offset);
|
|
if (m_type == atAFAPlusOffset)
|
|
s.PutChar(']');
|
|
} break;
|
|
|
|
case inOtherRegister: {
|
|
const RegisterInfo *other_reg_info = nullptr;
|
|
if (unwind_plan)
|
|
other_reg_info = unwind_plan->GetRegisterInfo(thread, m_location.reg_num);
|
|
if (other_reg_info)
|
|
s.Printf("=%s", other_reg_info->name);
|
|
else
|
|
s.Printf("=reg(%u)", m_location.reg_num);
|
|
} break;
|
|
|
|
case atDWARFExpression:
|
|
case isDWARFExpression: {
|
|
s.PutChar('=');
|
|
if (m_type == atDWARFExpression)
|
|
s.PutCString("[dwarf-expr]");
|
|
else
|
|
s.PutCString("dwarf-expr");
|
|
} break;
|
|
}
|
|
}
|
|
|
|
static void DumpRegisterName(Stream &s, const UnwindPlan *unwind_plan,
|
|
Thread *thread, uint32_t reg_num) {
|
|
const RegisterInfo *reg_info = unwind_plan->GetRegisterInfo(thread, reg_num);
|
|
if (reg_info)
|
|
s.PutCString(reg_info->name);
|
|
else
|
|
s.Printf("reg(%u)", reg_num);
|
|
}
|
|
|
|
bool UnwindPlan::Row::FAValue::
|
|
operator==(const UnwindPlan::Row::FAValue &rhs) const {
|
|
if (m_type == rhs.m_type) {
|
|
switch (m_type) {
|
|
case unspecified:
|
|
return true;
|
|
|
|
case isRegisterPlusOffset:
|
|
return m_value.reg.offset == rhs.m_value.reg.offset;
|
|
|
|
case isRegisterDereferenced:
|
|
return m_value.reg.reg_num == rhs.m_value.reg.reg_num;
|
|
|
|
case isDWARFExpression:
|
|
if (m_value.expr.length == rhs.m_value.expr.length)
|
|
return !memcmp(m_value.expr.opcodes, rhs.m_value.expr.opcodes,
|
|
m_value.expr.length);
|
|
break;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void UnwindPlan::Row::FAValue::Dump(Stream &s, const UnwindPlan *unwind_plan,
|
|
Thread *thread) const {
|
|
switch (m_type) {
|
|
case isRegisterPlusOffset:
|
|
DumpRegisterName(s, unwind_plan, thread, m_value.reg.reg_num);
|
|
s.Printf("%+3d", m_value.reg.offset);
|
|
break;
|
|
case isRegisterDereferenced:
|
|
s.PutChar('[');
|
|
DumpRegisterName(s, unwind_plan, thread, m_value.reg.reg_num);
|
|
s.PutChar(']');
|
|
break;
|
|
case isDWARFExpression:
|
|
s.PutCString("dwarf-expr");
|
|
break;
|
|
default:
|
|
s.PutCString("unspecified");
|
|
break;
|
|
}
|
|
}
|
|
|
|
void UnwindPlan::Row::Clear() {
|
|
m_cfa_value.SetUnspecified();
|
|
m_afa_value.SetUnspecified();
|
|
m_offset = 0;
|
|
m_register_locations.clear();
|
|
}
|
|
|
|
void UnwindPlan::Row::Dump(Stream &s, const UnwindPlan *unwind_plan,
|
|
Thread *thread, addr_t base_addr) const {
|
|
if (base_addr != LLDB_INVALID_ADDRESS)
|
|
s.Printf("0x%16.16" PRIx64 ": CFA=", base_addr + GetOffset());
|
|
else
|
|
s.Printf("%4" PRId64 ": CFA=", GetOffset());
|
|
|
|
m_cfa_value.Dump(s, unwind_plan, thread);
|
|
|
|
if (!m_afa_value.IsUnspecified()) {
|
|
s.Printf(" AFA=");
|
|
m_afa_value.Dump(s, unwind_plan, thread);
|
|
}
|
|
|
|
s.Printf(" => ");
|
|
for (collection::const_iterator idx = m_register_locations.begin();
|
|
idx != m_register_locations.end(); ++idx) {
|
|
DumpRegisterName(s, unwind_plan, thread, idx->first);
|
|
const bool verbose = false;
|
|
idx->second.Dump(s, unwind_plan, this, thread, verbose);
|
|
s.PutChar(' ');
|
|
}
|
|
s.EOL();
|
|
}
|
|
|
|
UnwindPlan::Row::Row()
|
|
: m_offset(0), m_cfa_value(), m_afa_value(), m_register_locations() {}
|
|
|
|
bool UnwindPlan::Row::GetRegisterInfo(
|
|
uint32_t reg_num,
|
|
UnwindPlan::Row::RegisterLocation ®ister_location) const {
|
|
collection::const_iterator pos = m_register_locations.find(reg_num);
|
|
if (pos != m_register_locations.end()) {
|
|
register_location = pos->second;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void UnwindPlan::Row::RemoveRegisterInfo(uint32_t reg_num) {
|
|
collection::const_iterator pos = m_register_locations.find(reg_num);
|
|
if (pos != m_register_locations.end()) {
|
|
m_register_locations.erase(pos);
|
|
}
|
|
}
|
|
|
|
void UnwindPlan::Row::SetRegisterInfo(
|
|
uint32_t reg_num,
|
|
const UnwindPlan::Row::RegisterLocation register_location) {
|
|
m_register_locations[reg_num] = register_location;
|
|
}
|
|
|
|
bool UnwindPlan::Row::SetRegisterLocationToAtCFAPlusOffset(uint32_t reg_num,
|
|
int32_t offset,
|
|
bool can_replace) {
|
|
if (!can_replace &&
|
|
m_register_locations.find(reg_num) != m_register_locations.end())
|
|
return false;
|
|
RegisterLocation reg_loc;
|
|
reg_loc.SetAtCFAPlusOffset(offset);
|
|
m_register_locations[reg_num] = reg_loc;
|
|
return true;
|
|
}
|
|
|
|
bool UnwindPlan::Row::SetRegisterLocationToIsCFAPlusOffset(uint32_t reg_num,
|
|
int32_t offset,
|
|
bool can_replace) {
|
|
if (!can_replace &&
|
|
m_register_locations.find(reg_num) != m_register_locations.end())
|
|
return false;
|
|
RegisterLocation reg_loc;
|
|
reg_loc.SetIsCFAPlusOffset(offset);
|
|
m_register_locations[reg_num] = reg_loc;
|
|
return true;
|
|
}
|
|
|
|
bool UnwindPlan::Row::SetRegisterLocationToUndefined(
|
|
uint32_t reg_num, bool can_replace, bool can_replace_only_if_unspecified) {
|
|
collection::iterator pos = m_register_locations.find(reg_num);
|
|
collection::iterator end = m_register_locations.end();
|
|
|
|
if (pos != end) {
|
|
if (!can_replace)
|
|
return false;
|
|
if (can_replace_only_if_unspecified && !pos->second.IsUnspecified())
|
|
return false;
|
|
}
|
|
RegisterLocation reg_loc;
|
|
reg_loc.SetUndefined();
|
|
m_register_locations[reg_num] = reg_loc;
|
|
return true;
|
|
}
|
|
|
|
bool UnwindPlan::Row::SetRegisterLocationToUnspecified(uint32_t reg_num,
|
|
bool can_replace) {
|
|
if (!can_replace &&
|
|
m_register_locations.find(reg_num) != m_register_locations.end())
|
|
return false;
|
|
RegisterLocation reg_loc;
|
|
reg_loc.SetUnspecified();
|
|
m_register_locations[reg_num] = reg_loc;
|
|
return true;
|
|
}
|
|
|
|
bool UnwindPlan::Row::SetRegisterLocationToRegister(uint32_t reg_num,
|
|
uint32_t other_reg_num,
|
|
bool can_replace) {
|
|
if (!can_replace &&
|
|
m_register_locations.find(reg_num) != m_register_locations.end())
|
|
return false;
|
|
RegisterLocation reg_loc;
|
|
reg_loc.SetInRegister(other_reg_num);
|
|
m_register_locations[reg_num] = reg_loc;
|
|
return true;
|
|
}
|
|
|
|
bool UnwindPlan::Row::SetRegisterLocationToSame(uint32_t reg_num,
|
|
bool must_replace) {
|
|
if (must_replace &&
|
|
m_register_locations.find(reg_num) == m_register_locations.end())
|
|
return false;
|
|
RegisterLocation reg_loc;
|
|
reg_loc.SetSame();
|
|
m_register_locations[reg_num] = reg_loc;
|
|
return true;
|
|
}
|
|
|
|
bool UnwindPlan::Row::operator==(const UnwindPlan::Row &rhs) const {
|
|
return m_offset == rhs.m_offset &&
|
|
m_cfa_value == rhs.m_cfa_value &&
|
|
m_afa_value == rhs.m_afa_value &&
|
|
m_register_locations == rhs.m_register_locations;
|
|
}
|
|
|
|
void UnwindPlan::AppendRow(const UnwindPlan::RowSP &row_sp) {
|
|
if (m_row_list.empty() ||
|
|
m_row_list.back()->GetOffset() != row_sp->GetOffset())
|
|
m_row_list.push_back(row_sp);
|
|
else
|
|
m_row_list.back() = row_sp;
|
|
}
|
|
|
|
void UnwindPlan::InsertRow(const UnwindPlan::RowSP &row_sp,
|
|
bool replace_existing) {
|
|
collection::iterator it = m_row_list.begin();
|
|
while (it != m_row_list.end()) {
|
|
RowSP row = *it;
|
|
if (row->GetOffset() >= row_sp->GetOffset())
|
|
break;
|
|
it++;
|
|
}
|
|
if (it == m_row_list.end() || (*it)->GetOffset() != row_sp->GetOffset())
|
|
m_row_list.insert(it, row_sp);
|
|
else if (replace_existing)
|
|
*it = row_sp;
|
|
}
|
|
|
|
UnwindPlan::RowSP UnwindPlan::GetRowForFunctionOffset(int offset) const {
|
|
RowSP row;
|
|
if (!m_row_list.empty()) {
|
|
if (offset == -1)
|
|
row = m_row_list.back();
|
|
else {
|
|
collection::const_iterator pos, end = m_row_list.end();
|
|
for (pos = m_row_list.begin(); pos != end; ++pos) {
|
|
if ((*pos)->GetOffset() <= static_cast<lldb::offset_t>(offset))
|
|
row = *pos;
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return row;
|
|
}
|
|
|
|
bool UnwindPlan::IsValidRowIndex(uint32_t idx) const {
|
|
return idx < m_row_list.size();
|
|
}
|
|
|
|
const UnwindPlan::RowSP UnwindPlan::GetRowAtIndex(uint32_t idx) const {
|
|
if (idx < m_row_list.size())
|
|
return m_row_list[idx];
|
|
else {
|
|
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
|
|
if (log)
|
|
log->Printf("error: UnwindPlan::GetRowAtIndex(idx = %u) invalid index "
|
|
"(number rows is %u)",
|
|
idx, (uint32_t)m_row_list.size());
|
|
return UnwindPlan::RowSP();
|
|
}
|
|
}
|
|
|
|
const UnwindPlan::RowSP UnwindPlan::GetLastRow() const {
|
|
if (m_row_list.empty()) {
|
|
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
|
|
if (log)
|
|
log->Printf("UnwindPlan::GetLastRow() when rows are empty");
|
|
return UnwindPlan::RowSP();
|
|
}
|
|
return m_row_list.back();
|
|
}
|
|
|
|
int UnwindPlan::GetRowCount() const { return m_row_list.size(); }
|
|
|
|
void UnwindPlan::SetPlanValidAddressRange(const AddressRange &range) {
|
|
if (range.GetBaseAddress().IsValid() && range.GetByteSize() != 0)
|
|
m_plan_valid_address_range = range;
|
|
}
|
|
|
|
bool UnwindPlan::PlanValidAtAddress(Address addr) {
|
|
// If this UnwindPlan has no rows, it is an invalid UnwindPlan.
|
|
if (GetRowCount() == 0) {
|
|
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
|
|
if (log) {
|
|
StreamString s;
|
|
if (addr.Dump(&s, nullptr, Address::DumpStyleSectionNameOffset)) {
|
|
log->Printf("UnwindPlan is invalid -- no unwind rows for UnwindPlan "
|
|
"'%s' at address %s",
|
|
m_source_name.GetCString(), s.GetData());
|
|
} else {
|
|
log->Printf(
|
|
"UnwindPlan is invalid -- no unwind rows for UnwindPlan '%s'",
|
|
m_source_name.GetCString());
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// If the 0th Row of unwind instructions is missing, or if it doesn't provide
|
|
// a register to use to find the Canonical Frame Address, this is not a valid
|
|
// UnwindPlan.
|
|
if (GetRowAtIndex(0).get() == nullptr ||
|
|
GetRowAtIndex(0)->GetCFAValue().GetValueType() ==
|
|
Row::FAValue::unspecified) {
|
|
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
|
|
if (log) {
|
|
StreamString s;
|
|
if (addr.Dump(&s, nullptr, Address::DumpStyleSectionNameOffset)) {
|
|
log->Printf("UnwindPlan is invalid -- no CFA register defined in row 0 "
|
|
"for UnwindPlan '%s' at address %s",
|
|
m_source_name.GetCString(), s.GetData());
|
|
} else {
|
|
log->Printf("UnwindPlan is invalid -- no CFA register defined in row 0 "
|
|
"for UnwindPlan '%s'",
|
|
m_source_name.GetCString());
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
if (!m_plan_valid_address_range.GetBaseAddress().IsValid() ||
|
|
m_plan_valid_address_range.GetByteSize() == 0)
|
|
return true;
|
|
|
|
if (!addr.IsValid())
|
|
return true;
|
|
|
|
if (m_plan_valid_address_range.ContainsFileAddress(addr))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
void UnwindPlan::Dump(Stream &s, Thread *thread, lldb::addr_t base_addr) const {
|
|
if (!m_source_name.IsEmpty()) {
|
|
s.Printf("This UnwindPlan originally sourced from %s\n",
|
|
m_source_name.GetCString());
|
|
}
|
|
if (m_lsda_address.IsValid() && m_personality_func_addr.IsValid()) {
|
|
TargetSP target_sp(thread->CalculateTarget());
|
|
addr_t lsda_load_addr = m_lsda_address.GetLoadAddress(target_sp.get());
|
|
addr_t personality_func_load_addr =
|
|
m_personality_func_addr.GetLoadAddress(target_sp.get());
|
|
|
|
if (lsda_load_addr != LLDB_INVALID_ADDRESS &&
|
|
personality_func_load_addr != LLDB_INVALID_ADDRESS) {
|
|
s.Printf("LSDA address 0x%" PRIx64
|
|
", personality routine is at address 0x%" PRIx64 "\n",
|
|
lsda_load_addr, personality_func_load_addr);
|
|
}
|
|
}
|
|
s.Printf("This UnwindPlan is sourced from the compiler: ");
|
|
switch (m_plan_is_sourced_from_compiler) {
|
|
case eLazyBoolYes:
|
|
s.Printf("yes.\n");
|
|
break;
|
|
case eLazyBoolNo:
|
|
s.Printf("no.\n");
|
|
break;
|
|
case eLazyBoolCalculate:
|
|
s.Printf("not specified.\n");
|
|
break;
|
|
}
|
|
s.Printf("This UnwindPlan is valid at all instruction locations: ");
|
|
switch (m_plan_is_valid_at_all_instruction_locations) {
|
|
case eLazyBoolYes:
|
|
s.Printf("yes.\n");
|
|
break;
|
|
case eLazyBoolNo:
|
|
s.Printf("no.\n");
|
|
break;
|
|
case eLazyBoolCalculate:
|
|
s.Printf("not specified.\n");
|
|
break;
|
|
}
|
|
if (m_plan_valid_address_range.GetBaseAddress().IsValid() &&
|
|
m_plan_valid_address_range.GetByteSize() > 0) {
|
|
s.PutCString("Address range of this UnwindPlan: ");
|
|
TargetSP target_sp(thread->CalculateTarget());
|
|
m_plan_valid_address_range.Dump(&s, target_sp.get(),
|
|
Address::DumpStyleSectionNameOffset);
|
|
s.EOL();
|
|
}
|
|
collection::const_iterator pos, begin = m_row_list.begin(),
|
|
end = m_row_list.end();
|
|
for (pos = begin; pos != end; ++pos) {
|
|
s.Printf("row[%u]: ", (uint32_t)std::distance(begin, pos));
|
|
(*pos)->Dump(s, this, thread, base_addr);
|
|
}
|
|
}
|
|
|
|
void UnwindPlan::SetSourceName(const char *source) {
|
|
m_source_name = ConstString(source);
|
|
}
|
|
|
|
ConstString UnwindPlan::GetSourceName() const { return m_source_name; }
|
|
|
|
const RegisterInfo *UnwindPlan::GetRegisterInfo(Thread *thread,
|
|
uint32_t unwind_reg) const {
|
|
if (thread) {
|
|
RegisterContext *reg_ctx = thread->GetRegisterContext().get();
|
|
if (reg_ctx) {
|
|
uint32_t reg;
|
|
if (m_register_kind == eRegisterKindLLDB)
|
|
reg = unwind_reg;
|
|
else
|
|
reg = reg_ctx->ConvertRegisterKindToRegisterNumber(m_register_kind,
|
|
unwind_reg);
|
|
if (reg != LLDB_INVALID_REGNUM)
|
|
return reg_ctx->GetRegisterInfoAtIndex(reg);
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|