From 7b18174eef70feb434f9319a57a6cfbe362730e3 Mon Sep 17 00:00:00 2001
From: Fernando Sahmkow <fsahmkow27@gmail.com>
Date: Fri, 20 Mar 2020 14:05:47 -0400
Subject: [PATCH] ARM/WaitTree: Better track the CallStack for each thread.

---
 src/core/arm/arm_interface.cpp  | 57 +++++++++++++++++++++++++++++++++
 src/core/arm/arm_interface.h    |  3 ++
 src/yuzu/debugger/wait_tree.cpp | 25 ++++++++-------
 3 files changed, 74 insertions(+), 11 deletions(-)

diff --git a/src/core/arm/arm_interface.cpp b/src/core/arm/arm_interface.cpp
index d079a1bc8a..d2295ed900 100644
--- a/src/core/arm/arm_interface.cpp
+++ b/src/core/arm/arm_interface.cpp
@@ -139,6 +139,63 @@ std::optional<std::string> GetSymbolName(const Symbols& symbols, VAddr func_addr
 
 constexpr u64 SEGMENT_BASE = 0x7100000000ull;
 
+std::vector<ARM_Interface::BacktraceEntry> ARM_Interface::GetBacktraceFromContext(
+    System& system, const ThreadContext64& ctx) {
+    std::vector<BacktraceEntry> out;
+    auto& memory = system.Memory();
+
+    auto fp = ctx.cpu_registers[29];
+    auto lr = ctx.cpu_registers[30];
+    while (true) {
+        out.push_back({"", 0, lr, 0});
+        if (!fp) {
+            break;
+        }
+        lr = memory.Read64(fp + 8) - 4;
+        fp = memory.Read64(fp);
+    }
+
+    std::map<VAddr, std::string> modules;
+    auto& loader{system.GetAppLoader()};
+    if (loader.ReadNSOModules(modules) != Loader::ResultStatus::Success) {
+        return {};
+    }
+
+    std::map<std::string, Symbols> symbols;
+    for (const auto& module : modules) {
+        symbols.insert_or_assign(module.second, GetSymbols(module.first, memory));
+    }
+
+    for (auto& entry : out) {
+        VAddr base = 0;
+        for (auto iter = modules.rbegin(); iter != modules.rend(); ++iter) {
+            const auto& module{*iter};
+            if (entry.original_address >= module.first) {
+                entry.module = module.second;
+                base = module.first;
+                break;
+            }
+        }
+
+        entry.offset = entry.original_address - base;
+        entry.address = SEGMENT_BASE + entry.offset;
+
+        if (entry.module.empty())
+            entry.module = "unknown";
+
+        const auto symbol_set = symbols.find(entry.module);
+        if (symbol_set != symbols.end()) {
+            const auto symbol = GetSymbolName(symbol_set->second, entry.offset);
+            if (symbol.has_value()) {
+                // TODO(DarkLordZach): Add demangling of symbol names.
+                entry.name = *symbol;
+            }
+        }
+    }
+
+    return out;
+}
+
 std::vector<ARM_Interface::BacktraceEntry> ARM_Interface::GetBacktrace() const {
     std::vector<BacktraceEntry> out;
     auto& memory = system.Memory();
diff --git a/src/core/arm/arm_interface.h b/src/core/arm/arm_interface.h
index 87a1c29cc9..e701ddf218 100644
--- a/src/core/arm/arm_interface.h
+++ b/src/core/arm/arm_interface.h
@@ -164,6 +164,9 @@ public:
         std::string name;
     };
 
+    static std::vector<BacktraceEntry> GetBacktraceFromContext(System& system,
+                                                               const ThreadContext64& ctx);
+
     std::vector<BacktraceEntry> GetBacktrace() const;
 
     /// fp (= r29) points to the last frame record.
diff --git a/src/yuzu/debugger/wait_tree.cpp b/src/yuzu/debugger/wait_tree.cpp
index fa091f4573..d2dbb259c9 100644
--- a/src/yuzu/debugger/wait_tree.cpp
+++ b/src/yuzu/debugger/wait_tree.cpp
@@ -2,10 +2,13 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <fmt/format.h>
+
 #include "yuzu/debugger/wait_tree.h"
 #include "yuzu/util/util.h"
 
 #include "common/assert.h"
+#include "core/arm/arm_interface.h"
 #include "core/core.h"
 #include "core/hle/kernel/handle_table.h"
 #include "core/hle/kernel/mutex.h"
@@ -116,20 +119,20 @@ QString WaitTreeCallstack::GetText() const {
 std::vector<std::unique_ptr<WaitTreeItem>> WaitTreeCallstack::GetChildren() const {
     std::vector<std::unique_ptr<WaitTreeItem>> list;
 
-    constexpr std::size_t BaseRegister = 29;
-    auto& memory = Core::System::GetInstance().Memory();
-    u64 base_pointer = thread.GetContext64().cpu_registers[BaseRegister];
+    if (thread.IsHLEThread()) {
+        return list;
+    }
 
-    while (base_pointer != 0) {
-        const u64 lr = memory.Read64(base_pointer + sizeof(u64));
-        if (lr == 0) {
-            break;
-        }
+    if (thread.GetOwnerProcess() == nullptr || !thread.GetOwnerProcess()->Is64BitProcess()) {
+        return list;
+    }
 
-        list.push_back(std::make_unique<WaitTreeText>(
-            tr("0x%1").arg(lr - sizeof(u32), 16, 16, QLatin1Char{'0'})));
+    auto backtrace = Core::ARM_Interface::GetBacktraceFromContext(Core::System::GetInstance(), thread.GetContext64());
 
-        base_pointer = memory.Read64(base_pointer);
+    for (auto& entry : backtrace) {
+        std::string s = fmt::format("{:20}{:016X} {:016X} {:016X} {}", entry.module, entry.address,
+                  entry.original_address, entry.offset, entry.name);
+        list.push_back(std::make_unique<WaitTreeText>(QString::fromStdString(s)));
     }
 
     return list;