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#include <binaryninjaapi.h>
#include <thread>
using namespace BinaryNinja;
class StackRenderLayer: public RenderLayer
{
public:
StackRenderLayer(): RenderLayer("Annotate Stack Offset") {}
void ApplyToLines(
Ref<BasicBlock> block,
std::vector<DisassemblyTextLine>& lines
)
{
for (auto& line: lines)
{
// Skip blank lines (block separators)
if (line.tokens.empty())
{
continue;
}
// Insert tokens after the address separator
int64_t sep = -1;
for (int64_t i = 0; i < line.tokens.size(); i ++)
{
if (line.tokens[i].type == AddressSeparatorToken)
{
sep = i;
break;
}
}
// Don't annotate lines which don't have an address separator
// (these are usually annotations like { Does not return }
if (sep == -1)
{
continue;
}
// Grab stack offset value from function
auto stackOffset = block->GetFunction()->GetRegisterValueAtInstruction(
block->GetArchitecture(),
line.addr,
block->GetArchitecture()->GetStackPointerRegister()
);
auto stackOffsetAfter = block->GetFunction()->GetRegisterValueAfterInstruction(
block->GetArchitecture(),
line.addr,
block->GetArchitecture()->GetStackPointerRegister()
);
if (stackOffset.state == StackFrameOffset)
{
// Stack pointer is resolved to an offset: show the offset
// (but negative because that is how other tools do it)
line.tokens.emplace(
line.tokens.begin() + sep + 1,
IntegerToken,
fmt::format("{:4x}", -stackOffset.value),
-stackOffset.value
);
}
else
{
// Stack pointer is not resolved, show ??
line.tokens.emplace(
line.tokens.begin() + sep + 1,
IntegerToken,
" ??",
0
);
}
// And put a spacer after the offset token
if (stackOffset != stackOffsetAfter)
{
line.tokens.emplace(
line.tokens.begin() + sep + 2,
TextToken,
"* "
);
}
else
{
line.tokens.emplace(
line.tokens.begin() + sep + 2,
TextToken,
" "
);
}
}
}
virtual void ApplyToDisassemblyBlock(
Ref<BasicBlock> block,
std::vector<DisassemblyTextLine>& lines
) override
{
// Break this out into a helper so we don't have to write it twice
ApplyToLines(block, lines);
}
virtual void ApplyToLowLevelILBlock(
Ref<BasicBlock> block,
std::vector<DisassemblyTextLine>& lines
) override
{
// Break this out into a helper so we don't have to write it twice
ApplyToLines(block, lines);
}
};
extern "C" {
BN_DECLARE_CORE_ABI_VERSION
#ifdef DEMO_EDITION
bool StackRenderLayerPluginInit()
#else
BINARYNINJAPLUGIN bool CorePluginInit()
#endif
{
static StackRenderLayer* layer = new StackRenderLayer();
RenderLayer::Register(layer, DisabledByDefaultRenderLayerDefaultEnableState);
return true;
}
}
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