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Splitting up the symbol database code to make it easier to work with.

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This commit is contained in:
Ben Vanik
2013-02-03 00:50:39 -08:00
parent 63f0785ecf
commit a020072ed7
11 changed files with 773 additions and 600 deletions
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src/cpu/sdb/xex_symbol_database.cc Normal file
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/**
******************************************************************************
* Xenia : Xbox 360 Emulator Research Project *
******************************************************************************
* Copyright 2013 Ben Vanik. All rights reserved. *
* Released under the BSD license - see LICENSE in the root for more details. *
******************************************************************************
*/
#include <xenia/cpu/sdb/xex_symbol_database.h>
#include <xenia/cpu/ppc/instr.h>
using namespace std;
using namespace xe;
using namespace xe::cpu;
using namespace xe::cpu::ppc;
using namespace xe::cpu::sdb;
using namespace xe::kernel;
namespace {
// IMAGE_CE_RUNTIME_FUNCTION_ENTRY
// http://msdn.microsoft.com/en-us/library/ms879748.aspx
typedef struct IMAGE_XBOX_RUNTIME_FUNCTION_ENTRY_t {
uint32_t FuncStart; // Virtual address
union {
struct {
uint32_t PrologLen : 8; // # of prolog instructions (size = x4)
uint32_t FuncLen : 22; // # of instructions total (size = x4)
uint32_t ThirtyTwoBit : 1; // Always 1
uint32_t ExceptionFlag : 1; // 1 if PDATA_EH in .text -- unknown if used
} Flags;
uint32_t FlagsValue; // To make byte swapping easier
};
} IMAGE_XBOX_RUNTIME_FUNCTION_ENTRY;
class PEMethodInfo {
public:
uint32_t address;
size_t total_length; // in bytes
size_t prolog_length; // in bytes
};
}
XexSymbolDatabase::XexSymbolDatabase(
xe_memory_ref memory, ExportResolver* export_resolver, xe_xex2_ref xex) :
SymbolDatabase(memory, export_resolver) {
xex_ = xe_xex2_retain(xex);
}
XexSymbolDatabase::~XexSymbolDatabase() {
xe_xex2_release(xex_);
}
int XexSymbolDatabase::Analyze() {
const xe_xex2_header_t* header = xe_xex2_get_header(xex_);
// Find __savegprlr_* and __restgprlr_*.
FindGplr();
// Add each import thunk.
for (size_t n = 0; n < header->import_library_count; n++) {
AddImports(&header->import_libraries[n]);
}
// Add each export root.
// TODO(benvanik): exports.
// - insert fn or variable
// - queue fn
// Add method hints, if available.
// Not all XEXs have these.
AddMethodHints();
return SymbolDatabase::Analyze();
}
int XexSymbolDatabase::FindGplr() {
// Special stack save/restore functions.
// __savegprlr_14 to __savegprlr_31
// __restgprlr_14 to __restgprlr_31
// http://research.microsoft.com/en-us/um/redmond/projects/invisible/src/crt/md/ppc/xxx.s.htm
// It'd be nice to stash these away and mark them as such to allow for
// special codegen.
static const uint32_t code_values[] = {
0x68FFC1F9, // __savegprlr_14
0x70FFE1F9, // __savegprlr_15
0x78FF01FA, // __savegprlr_16
0x80FF21FA, // __savegprlr_17
0x88FF41FA, // __savegprlr_18
0x90FF61FA, // __savegprlr_19
0x98FF81FA, // __savegprlr_20
0xA0FFA1FA, // __savegprlr_21
0xA8FFC1FA, // __savegprlr_22
0xB0FFE1FA, // __savegprlr_23
0xB8FF01FB, // __savegprlr_24
0xC0FF21FB, // __savegprlr_25
0xC8FF41FB, // __savegprlr_26
0xD0FF61FB, // __savegprlr_27
0xD8FF81FB, // __savegprlr_28
0xE0FFA1FB, // __savegprlr_29
0xE8FFC1FB, // __savegprlr_30
0xF0FFE1FB, // __savegprlr_31
0xF8FF8191,
0x2000804E,
0x68FFC1E9, // __restgprlr_14
0x70FFE1E9, // __restgprlr_15
0x78FF01EA, // __restgprlr_16
0x80FF21EA, // __restgprlr_17
0x88FF41EA, // __restgprlr_18
0x90FF61EA, // __restgprlr_19
0x98FF81EA, // __restgprlr_20
0xA0FFA1EA, // __restgprlr_21
0xA8FFC1EA, // __restgprlr_22
0xB0FFE1EA, // __restgprlr_23
0xB8FF01EB, // __restgprlr_24
0xC0FF21EB, // __restgprlr_25
0xC8FF41EB, // __restgprlr_26
0xD0FF61EB, // __restgprlr_27
0xD8FF81EB, // __restgprlr_28
0xE0FFA1EB, // __restgprlr_29
0xE8FFC1EB, // __restgprlr_30
0xF0FFE1EB, // __restgprlr_31
0xF8FF8181,
0xA603887D,
0x2000804E,
};
uint32_t gplr_start = 0;
const xe_xex2_header_t* header = xe_xex2_get_header(xex_);
for (size_t n = 0, i = 0; n < header->section_count; n++) {
const xe_xex2_section_t* section = &header->sections[n];
const size_t start_address =
header->exe_address + (i * xe_xex2_section_length);
const size_t end_address =
start_address + (section->info.page_count * xe_xex2_section_length);
if (section->info.type == XEX_SECTION_CODE) {
gplr_start = xe_memory_search_aligned(
memory_, start_address, end_address,
code_values, XECOUNT(code_values));
if (gplr_start) {
break;
}
}
i += section->info.page_count;
}
if (!gplr_start) {
return 0;
}
// Add function stubs.
char name[32];
uint32_t address = gplr_start;
for (int n = 14; n <= 31; n++) {
xesnprintfa(name, XECOUNT(name), "__savegprlr_%d", n);
FunctionSymbol* fn = GetOrInsertFunction(address);
fn->end_address = fn->start_address + (31 - n) * 4 + 2 * 4;
fn->name = xestrdupa(name);
fn->type = FunctionSymbol::User;
fn->flags |= FunctionSymbol::kFlagSaveGprLr;
address += 4;
}
address = gplr_start + 20 * 4;
for (int n = 14; n <= 31; n++) {
xesnprintfa(name, XECOUNT(name), "__restgprlr_%d", n);
FunctionSymbol* fn = GetOrInsertFunction(address);
fn->end_address = fn->start_address + (31 - n) * 4 + 3 * 4;
fn->name = xestrdupa(name);
fn->type = FunctionSymbol::User;
fn->flags |= FunctionSymbol::kFlagRestGprLr;
address += 4;
}
return 0;
}
int XexSymbolDatabase::AddImports(const xe_xex2_import_library_t* library) {
xe_xex2_import_info_t* import_infos;
size_t import_info_count;
if (xe_xex2_get_import_infos(xex_, library, &import_infos,
&import_info_count)) {
return 1;
}
char name[128];
for (size_t n = 0; n < import_info_count; n++) {
const xe_xex2_import_info_t* info = &import_infos[n];
KernelExport* kernel_export = export_resolver_->GetExportByOrdinal(
library->name, info->ordinal);
VariableSymbol* var = GetOrInsertVariable(info->value_address);
if (kernel_export) {
if (info->thunk_address) {
xesnprintfa(name, XECOUNT(name), "__imp__%s", kernel_export->name);
} else {
xesnprintfa(name, XECOUNT(name), "%s", kernel_export->name);
}
} else {
xesnprintfa(name, XECOUNT(name), "__imp__%s_%.3X", library->name,
info->ordinal);
}
var->name = xestrdupa(name);
var->kernel_export = kernel_export;
if (info->thunk_address) {
FunctionSymbol* fn = GetOrInsertFunction(info->thunk_address);
fn->end_address = fn->start_address + 16 - 4;
fn->type = FunctionSymbol::Kernel;
fn->kernel_export = kernel_export;
if (kernel_export) {
xesnprintfa(name, XECOUNT(name), "%s", kernel_export->name);
} else {
xesnprintfa(name, XECOUNT(name), "__kernel_%s_%.3X", library->name,
info->ordinal);
}
fn->name = xestrdupa(name);
}
}
xe_free(import_infos);
return 0;
}
int XexSymbolDatabase::AddMethodHints() {
uint8_t* mem = xe_memory_addr(memory_, 0);
const IMAGE_XBOX_RUNTIME_FUNCTION_ENTRY* entry = NULL;
// Find pdata, which contains the exception handling entries.
const PESection* pdata = xe_xex2_get_pe_section(xex_, ".pdata");
if (!pdata) {
// No exception data to go on.
return 0;
}
// Resolve.
const uint8_t* p = mem + pdata->address;
// Entry count = pdata size / sizeof(entry).
size_t entry_count = pdata->size / sizeof(IMAGE_XBOX_RUNTIME_FUNCTION_ENTRY);
if (!entry_count) {
// Empty?
return 0;
}
// Allocate output.
PEMethodInfo* method_infos = (PEMethodInfo*)xe_calloc(
entry_count * sizeof(PEMethodInfo));
if (!method_infos) {
return 0;
}
// Parse entries.
// NOTE: entries are in memory as big endian, so pull them out and swap the
// values before using them.
entry = (const IMAGE_XBOX_RUNTIME_FUNCTION_ENTRY*)p;
IMAGE_XBOX_RUNTIME_FUNCTION_ENTRY temp_entry;
for (size_t n = 0; n < entry_count; n++, entry++) {
PEMethodInfo* method_info = &method_infos[n];
method_info->address = XESWAP32BE(entry->FuncStart);
// The bitfield needs to be swapped by hand.
temp_entry.FlagsValue = XESWAP32BE(entry->FlagsValue);
method_info->total_length = temp_entry.Flags.FuncLen * 4;
method_info->prolog_length = temp_entry.Flags.PrologLen * 4;
}
for (size_t n = 0; n < entry_count; n++) {
PEMethodInfo* method_info = &method_infos[n];
FunctionSymbol* fn = GetOrInsertFunction(method_info->address);
fn->end_address = method_info->address + method_info->total_length - 4;
fn->type = FunctionSymbol::User;
// TODO(benvanik): something with prolog_length?
}
xe_free(method_infos);
return 0;
}
uint32_t XexSymbolDatabase::GetEntryPoint() {
const xe_xex2_header_t* header = xe_xex2_get_header(xex_);
return header->exe_entry_point;
};
bool XexSymbolDatabase::IsValueInTextRange(uint32_t value) {
const xe_xex2_header_t* header = xe_xex2_get_header(xex_);
for (size_t n = 0, i = 0; n < header->section_count; n++) {
const xe_xex2_section_t* section = &header->sections[n];
const size_t start_address =
header->exe_address + (i * xe_xex2_section_length);
const size_t end_address =
start_address + (section->info.page_count * xe_xex2_section_length);
if (value >= start_address && value < end_address) {
return section->info.type == XEX_SECTION_CODE;
}
i += section->info.page_count;
}
return false;
}