Bug Fixes & Low-Level Improvements

.gitea/workflows/build.yml

@@ -87,9 +87,7 @@ jobs:
                 ./out/client/host/usr/bin/minecraft-pi-reborn-client --copy-sdk
           # Build Example Mods
           - name: Build Example Mods
-            run: |
+            run: ./example-mods/build.sh
-                cd example-mods
-                ./build.sh
           - name: Upload Artifacts
             uses: actions/upload-artifact@v3
             with:

docs/CHANGELOG.md

@@ -21,6 +21,7 @@
 * Fix Item Dropping When Killing Players From The Server Console
 * Fix Furnace Visual Bug When Using Lava Bucket As Fuel
 * Add Splash Text To Start Screen
+* `overwrite_calls` Now Scans VTables
 
 **2.5.3**
 * Add `Replace Block Highlight With Outline` Feature Flag (Enabled By Default)

example-mods/build.sh

@@ -3,6 +3,7 @@
 set -e
 
 # Create Output Directory
+cd "$(dirname "$0")"
 ROOT="$(pwd)"
 OUT="${ROOT}/out"
 rm -rf "${OUT}"

launcher/src/patchelf.cpp

@@ -3,6 +3,9 @@
 
 #include <LIEF/ELF.hpp>
 
+#include <dlfcn.h>
+#include <link.h>
+
 #include <libreborn/libreborn.h>
 
 #include "patchelf.h"

libreborn/CMakeLists.txt

@@ -5,7 +5,7 @@ file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/include/libreborn")
 configure_file(include/libreborn/config.h.in "${CMAKE_CURRENT_BINARY_DIR}/include/libreborn/config.h" ESCAPE_QUOTES @ONLY)
 
 # Util
-add_library(reborn-util SHARED src/util/elf.c src/util/exec.c src/util/string.c src/util/util.c src/util/log.c src/util/cp437.cpp)
+add_library(reborn-util SHARED src/util/exec.c src/util/string.c src/util/util.c src/util/log.c src/util/cp437.cpp)
 target_include_directories(
     reborn-util
     PUBLIC
@@ -25,7 +25,7 @@ endif()
 
 # Patch
 if(BUILD_ARM_COMPONENTS)
-    add_library(reborn-patch SHARED src/patch/patch.c)
+    add_library(reborn-patch SHARED src/patch/patch.cpp src/patch/segments.cpp src/patch/code-block.cpp src/patch/instruction.cpp)
     target_link_libraries(reborn-patch dl pthread reborn-util)
     target_compile_definitions(reborn-patch PUBLIC -DREBORN_HAS_PATCH_CODE)
     # Install

libreborn/include/libreborn/elf.h

@@ -1,22 +0,0 @@
-#pragma once
-
-#include <unistd.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <elf.h>
-#include <link.h>
-
-#include "log.h"
-#include "exec.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// Find And Iterate Over All Segments In Current Binary
-typedef void (*segment_callback_t)(ElfW(Addr) section, ElfW(Word) size, void *data);
-void iterate_segments(segment_callback_t callback, void *data);
-
-#ifdef __cplusplus
-}
-#endif

libreborn/include/libreborn/libreborn.h

@@ -5,6 +5,5 @@
 #include "util.h"
 #include "string.h"
 #include "exec.h"
-#include "elf.h"
 #include "home.h"
 #include "patch.h"

libreborn/include/libreborn/patch.h

@@ -8,6 +8,8 @@ extern "C" {
 
 #ifdef REBORN_HAS_PATCH_CODE
 
+void reborn_init_patch();
+
 void _overwrite_call(const char *file, int line, void *start, void *target);
 #define overwrite_call(start, target) _overwrite_call(__FILE__, __LINE__, start, target);
 

libreborn/src/patch/code-block.cpp

@@ -0,0 +1,46 @@
+#include <sys/mman.h>
+
+#include <libreborn/libreborn.h>
+#include "patch-internal.h"
+
+// Limit To 512 overwrite_calls() Uses
+#define CODE_BLOCK_SIZE 4096
+static unsigned char *code_block = NULL;
+#define CODE_SIZE 8
+static int code_block_remaining = CODE_BLOCK_SIZE;
+
+// Create Long Overwrite At Current Position
+static void long_overwrite(void *start, void *target) {
+    unsigned char patch_data[4] = {0x04, 0xf0, 0x1f, 0xe5}; // "ldr pc, [pc, #-0x4]"
+    _patch(NULL, -1, start, patch_data);
+    _patch_address(NULL, -1, (void *) (((unsigned char *) start) + 4), target);
+}
+void *update_code_block(void *target) {
+    // BL Instructions can only access a limited portion of memory.
+    // So this allocates memory closer to the original instruction,
+    // that when run, will jump into the actual target.
+    if (code_block == NULL) {
+        code_block = (unsigned char *) mmap((void *) 0x200000, CODE_BLOCK_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+        if (code_block == MAP_FAILED) {
+            ERR("Unable To Allocate Code Block: %s", strerror(errno));
+        }
+        DEBUG("Code Block Allocated At: 0x%08x", (uint32_t) code_block);
+        // Store Segment
+        segment_data data;
+        data.start = code_block;
+        data.end = (void *) (((uintptr_t) code_block) + CODE_BLOCK_SIZE);
+        data.is_executable = true;
+        data.is_writable = true;
+        add_segment(data);
+    }
+    if (code_block_remaining < CODE_SIZE) {
+        ERR("Maximum Amount Of overwrite_calls() Uses Reached");
+    }
+    long_overwrite(code_block, target);
+    // Return
+    return code_block;
+}
+void increment_code_block() {
+    code_block = code_block + CODE_SIZE;
+    code_block_remaining = code_block_remaining - CODE_SIZE;
+}

libreborn/src/patch/instruction.cpp

@@ -0,0 +1,50 @@
+#include <libreborn/libreborn.h>
+#include "patch-internal.h"
+
+// Generate A BL Instruction
+#define INSTRUCTION_RANGE 32000000
+static uint64_t nice_diff_64(uint64_t a, uint64_t b) {
+    if (a > b) {
+        return a - b;
+    } else {
+        return b - a;
+    }
+}
+uint32_t generate_bl_instruction(void *from, void *to, int use_b_instruction) {
+    // Check Instruction Range
+    if (nice_diff_64((uint64_t) to, (uint64_t) from) > INSTRUCTION_RANGE) {
+        IMPOSSIBLE();
+    }
+
+    // Create New Instruction
+    uint32_t instruction;
+    unsigned char *instruction_array = (unsigned char *) &instruction;
+    instruction_array[3] = use_b_instruction ? B_INSTRUCTION : BL_INSTRUCTION;
+
+    // Determine PC
+    unsigned char *pc = ((unsigned char *) from) + 8;
+    int32_t offset = (int32_t) to - (int32_t) pc;
+    int32_t target = offset >> 2;
+
+    // Set Instruction Offset
+    unsigned char *target_array = (unsigned char *) &target;
+    instruction_array[0] = target_array[0];
+    instruction_array[1] = target_array[1];
+    instruction_array[2] = target_array[2];
+
+    // Return
+    return instruction;
+}
+
+// Extract Target Address From B(L) Instruction
+void *extract_from_bl_instruction(unsigned char *from) {
+    // Calculate PC
+    unsigned char *pc = ((unsigned char *) from) + 8;
+
+    // Extract Offset From Instruction
+    int32_t target = *(int32_t *) from;
+    target = (target << 8) >> 8;
+    int32_t offset = target << 2;
+    // Add PC To Offset
+    return (void *) (pc + offset);
+}

libreborn/src/patch/patch-internal.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#ifndef __arm__
+#error "Patching Code Is ARM Only"
+#endif
+
+#include <cstdint>
+
+// Segments
+struct segment_data {
+    void *start;
+    void *end;
+    bool is_executable;
+    bool is_writable;
+};
+__attribute__((visibility("internal"))) segment_data &get_data_for_addr(void *addr);
+__attribute__((visibility("internal"))) void add_segment(segment_data data);
+
+// Code Block
+__attribute__((visibility("internal"))) void *update_code_block(void *target);
+__attribute__((visibility("internal"))) void increment_code_block();
+
+// BL Instruction Magic Number
+#define BL_INSTRUCTION 0xeb
+#define B_INSTRUCTION 0xea
+__attribute__((visibility("internal"))) uint32_t generate_bl_instruction(void *from, void *to, int use_b_instruction);

libreborn/src/patch/patch.c

@@ -1,214 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/mman.h>
-#include <stdint.h>
-#include <errno.h>
-
-#include <libreborn/libreborn.h>
-
-#ifndef __arm__
-#error "Patching Code Is ARM Only"
-#endif
-
-// BL Instruction Magic Number
-#define BL_INSTRUCTION 0xeb
-#define B_INSTRUCTION 0xea
-
-// Generate A BL Instruction
-static uint32_t generate_bl_instruction(void *from, void *to, int use_b_instruction) {
-    if (abs(((int32_t) to) - ((int32_t) from)) > 32000000) {
-        IMPOSSIBLE();
-    }
-
-    uint32_t instruction;
-    unsigned char *instruction_array = (unsigned char *) &instruction;
-
-    instruction_array[3] = use_b_instruction ? B_INSTRUCTION : BL_INSTRUCTION;
-
-    unsigned char *pc = ((unsigned char *) from) + 8;
-    int32_t offset = (int32_t) to - (int32_t) pc;
-    int32_t target = offset >> 2;
-
-    unsigned char *target_array = (unsigned char *) &target;
-    instruction_array[0] = target_array[0];
-    instruction_array[1] = target_array[1];
-    instruction_array[2] = target_array[2];
-
-    return instruction;
-}
-
-// Run For Every .text Section
-static int _overwrite_calls_within_internal(const char *file, int line, void *from, void *to, void *target, void *replacement) {
-    int found = 0;
-    for (uint32_t i = (uint32_t) from; i < (uint32_t) to; i = i + 4) {
-        unsigned char *addr = (unsigned char *) i;
-        int use_b_instruction = addr[3] == B_INSTRUCTION;
-        // Check If Instruction is B Or BL
-        if (addr[3] == BL_INSTRUCTION || use_b_instruction) {
-            uint32_t check_instruction = generate_bl_instruction(addr, target, use_b_instruction);
-            unsigned char *check_instruction_array = (unsigned char *) &check_instruction;
-            // Check If Instruction Calls Target
-            if (addr[0] == check_instruction_array[0] && addr[1] == check_instruction_array[1] && addr[2] == check_instruction_array[2]) {
-                // Patch Instruction
-                uint32_t new_instruction = generate_bl_instruction(addr, replacement, use_b_instruction);
-                _patch(file, line, addr, (unsigned char *) &new_instruction);
-                found++;
-            }
-        }
-    }
-    return found;
-}
-struct overwrite_data {
-    const char *file;
-    int line;
-    void *target;
-    void *replacement;
-    int found;
-};
-static void overwrite_calls_callback(ElfW(Addr) section_addr, ElfW(Word) size, void *data) {
-    struct overwrite_data *args = (struct overwrite_data *) data;
-    void *section = (void *) section_addr;
-    args->found += _overwrite_calls_within_internal(args->file, args->line, section, (void *) (section_addr + size), args->target, args->replacement);
-}
-
-// Limit To 512 overwrite_calls() Uses
-#define CODE_BLOCK_SIZE 4096
-static unsigned char *code_block = NULL;
-#define CODE_SIZE 8
-static int code_block_remaining = CODE_BLOCK_SIZE;
-
-static void _long_overwrite(void *start, void *target) {
-    unsigned char patch_data[4] = {0x04, 0xf0, 0x1f, 0xe5}; // "ldr pc, [pc, #-0x4]"
-
-    _patch(NULL, -1, start, patch_data);
-    _patch_address(NULL, -1, (void *) (((unsigned char *) start) + 4), target);
-}
-static void update_code_block(void *target) {
-    // BL Instructions Can Only Access A Limited Portion of Memory, So This Allocates Memory Closer To The Original Instruction, That When Run, Will Jump Into The Actual Target
-    if (code_block == NULL) {
-        code_block = mmap((void *) 0x200000, CODE_BLOCK_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
-        if (code_block == MAP_FAILED) {
-            ERR("Unable To Allocate Code Block: %s", strerror(errno));
-        }
-        DEBUG("Code Block Allocated At: 0x%08x", (uint32_t) code_block);
-    }
-    if (code_block_remaining < CODE_SIZE) {
-        ERR("Maximum Amount Of overwrite_calls() Uses Reached");
-    }
-    _long_overwrite(code_block, target);
-}
-static void increment_code_block() {
-    code_block = code_block + CODE_SIZE;
-    code_block_remaining = code_block_remaining - CODE_SIZE;
-}
-
-// Overwrite Specific B(L) Instruction
-static void _overwrite_call_internal(const char *file, int line, void *start, void *target, int use_b_instruction) {
-    // Add New Target To Code Block
-    update_code_block(target);
-
-    // Patch
-    uint32_t new_instruction = generate_bl_instruction(start, code_block, use_b_instruction);
-    _patch(file, line, start, (unsigned char *) &new_instruction);
-
-    // Increment Code Block Position
-    increment_code_block();
-}
-void _overwrite_call(const char *file, int line, void *start, void *target) {
-    int use_b_instruction = ((unsigned char *) start)[3] == B_INSTRUCTION;
-    _overwrite_call_internal(file, line, start, target, use_b_instruction);
-}
-
-// Overwrite All B(L) Intrusctions That Target The Specified Address
-#define NO_CALLSITE_ERROR "(%s:%i) Unable To Find Callsites For 0x%08x"
-void _overwrite_calls(const char *file, int line, void *start, void *target) {
-    // Add New Target To Code Block
-    update_code_block(target);
-
-    struct overwrite_data data;
-    data.file = file;
-    data.line = line;
-    data.target = start;
-    data.replacement = code_block;
-    data.found = 0;
-
-    iterate_segments(overwrite_calls_callback, &data);
-
-    // Increment Code Block Position
-    increment_code_block();
-
-    // Check
-    if (data.found < 1) {
-        ERR(NO_CALLSITE_ERROR, file, line, (uint32_t) start);
-    }
-}
-void _overwrite_calls_within(const char *file, int line, void *from /* inclusive */, void *to /* exclusive */, void *target, void *replacement) {
-    // Add New Target To Code Block
-    update_code_block(replacement);
-
-    // Patch
-    int found = _overwrite_calls_within_internal(file, line, from, to, target, code_block);
-    // Check
-    if (found < 1) {
-        ERR(NO_CALLSITE_ERROR, file, line, (uint32_t) target);
-    }
-
-    // Increment Code Block Position
-    increment_code_block();
-}
-
-// Extract Target Address From B(L) Instruction
-void *extract_from_bl_instruction(unsigned char *from) {
-    unsigned char *pc = ((unsigned char *) from) + 8;
-
-    int32_t target = *(int32_t *) from;
-    target = (target << 8) >> 8;
-
-    int32_t offset = target << 2;
-
-    return (void *) (pc + offset);
-}
-
-// Overwrite Function
-void _overwrite(const char *file, int line, void *start, void *target) {
-    _overwrite_call_internal(file, line, start, target, 1);
-}
-
-// Print Patch Debug Data
-#define PATCH_PRINTF(file, line, start, str) if (file != NULL) DEBUG("(%s:%i): Patching (0x%08x) - " str ": 0x%02x 0x%02x 0x%02x 0x%02x", file, line, (uint32_t) start, data[0], data[1], data[2], data[3]);
-
-// Patch Instruction
-void _patch(const char *file, int line, void *start, unsigned char patch[4]) {
-    if (((uint32_t) start) % 4 != 0) {
-        ERR("Invalid Address");
-    }
-
-    size_t page_size = sysconf(_SC_PAGESIZE);
-    uintptr_t end = ((uintptr_t) start) + 4;
-    uintptr_t page_start = ((uintptr_t) start) & -page_size;
-    // Allow Writing To Code Memory
-    mprotect((void *) page_start, end - page_start, PROT_READ | PROT_WRITE | PROT_EXEC); // PROT_EXEC Is Needed Because Other Code In The Page May Be Being Executed
-
-    unsigned char *data = (unsigned char *) start;
-
-    PATCH_PRINTF(file, line, start, "original");
-
-    memcpy(data, patch, 4);
-
-    PATCH_PRINTF(file, line, start, "result");
-
-    // Reset Code Memory Permissions
-    mprotect((void *) page_start, end - page_start, PROT_READ | PROT_EXEC);
-
-    // Clear ARM Instruction Cache
-    __clear_cache(start, (void *) end);
-}
-
-// Patch Address
-void _patch_address(const char *file, int line, void *start, void *target) {
-    uint32_t addr = (uint32_t) target;
-    unsigned char *patch_data = (unsigned char *) &addr;
-    _patch(file, line, start, patch_data);
-}

libreborn/src/patch/patch.cpp

@@ -0,0 +1,163 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <cstdint>
+#include <cerrno>
+
+#include <libreborn/libreborn.h>
+#include "patch-internal.h"
+
+// Overwrite Specific B(L) Instruction
+static void _overwrite_call_internal(const char *file, int line, void *start, void *target, int use_b_instruction) {
+    // Add New Target To Code Block
+    void *code_block = update_code_block(target);
+
+    // Patch
+    uint32_t new_instruction = generate_bl_instruction(start, code_block, use_b_instruction);
+    _patch(file, line, start, (unsigned char *) &new_instruction);
+
+    // Increment Code Block Position
+    increment_code_block();
+}
+void _overwrite_call(const char *file, int line, void *start, void *target) {
+    int use_b_instruction = ((unsigned char *) start)[3] == B_INSTRUCTION;
+    _overwrite_call_internal(file, line, start, target, use_b_instruction);
+}
+
+// .rodata Information
+#define RODATA_START 0x1020c8
+#define RODATA_END 0x11665c
+// Search And Patch VTables Containing Function
+static int _patch_vtables(const char *file, int line, void *target, void *replacement) {
+    int found = 0;
+    for (uintptr_t i = RODATA_START; i < RODATA_END; i = i + 4) {
+        uint32_t *addr = (uint32_t *) i;
+        if (*addr == (uintptr_t) target) {
+            // Found VTable Entry
+            _patch_address(file, line, addr, replacement);
+            found++;
+        }
+    }
+    return found;
+}
+
+// Patch Calls Within Range
+static int _overwrite_calls_within_internal(const char *file, int line, void *from, void *to, void *target, void *replacement) {
+    int found = 0;
+    for (uintptr_t i = (uintptr_t) from; i < (uintptr_t) to; i = i + 4) {
+        unsigned char *addr = (unsigned char *) i;
+        int use_b_instruction = addr[3] == B_INSTRUCTION;
+        // Check If Instruction is B Or BL
+        if (addr[3] == BL_INSTRUCTION || use_b_instruction) {
+            uint32_t check_instruction = generate_bl_instruction(addr, target, use_b_instruction);
+            unsigned char *check_instruction_array = (unsigned char *) &check_instruction;
+            // Check If Instruction Calls Target
+            if (addr[0] == check_instruction_array[0] && addr[1] == check_instruction_array[1] && addr[2] == check_instruction_array[2]) {
+                // Patch Instruction
+                uint32_t new_instruction = generate_bl_instruction(addr, replacement, use_b_instruction);
+                _patch(file, line, addr, (unsigned char *) &new_instruction);
+                found++;
+            }
+        }
+    }
+    return found;
+}
+
+// .text Information
+#define TEXT_START 0xde60
+#define TEXT_END 0x1020c0
+// Overwrite All B(L) Intrusctions That Target The Specified Address
+#define NO_CALLSITE_ERROR "(%s:%i) Unable To Find Callsites For %p"
+void _overwrite_calls(const char *file, int line, void *start, void *target) {
+    // Add New Target To Code Block
+    void *code_block = update_code_block(target);
+
+    // Patch Code
+    int found = _overwrite_calls_within_internal(file, line, (void *) TEXT_START, (void *) TEXT_END, start, code_block);
+    // Patch VTables
+    found += _patch_vtables(file, line, start, code_block);
+
+    // Increment Code Block Position
+    increment_code_block();
+
+    // Check
+    if (found < 1) {
+        ERR(NO_CALLSITE_ERROR, file, line, start);
+    }
+}
+void _overwrite_calls_within(const char *file, int line, void *from /* inclusive */, void *to /* exclusive */, void *target, void *replacement) {
+    // Add New Target To Code Block
+    void *code_block = update_code_block(replacement);
+
+    // Patch
+    int found = _overwrite_calls_within_internal(file, line, from, to, target, code_block);
+    // Check
+    if (found < 1) {
+        ERR(NO_CALLSITE_ERROR, file, line, target);
+    }
+
+    // Increment Code Block Position
+    increment_code_block();
+}
+
+// Overwrite Function
+void _overwrite(const char *file, int line, void *start, void *target) {
+    // Replace the function's start with a call
+    // to the replacement function.
+    _overwrite_call_internal(file, line, start, target, 1);
+}
+
+// Print Patch Debug Data
+#define PATCH_PRINTF(file, line, start, str) if (file != NULL) DEBUG("(%s:%i): Patching (%p) - " str ": %02x %02x %02x %02x", file, line, start, data[0], data[1], data[2], data[3]);
+
+// Patch Instruction
+static void safe_mprotect(void *addr, size_t len, int prot) {
+    long page_size = sysconf(_SC_PAGESIZE);
+    long diff = ((uintptr_t) addr) % page_size;
+    void *aligned_addr = (void *) (((uintptr_t) addr) - diff);
+    size_t aligned_len = len + diff;
+    int ret = mprotect(aligned_addr, aligned_len, prot);
+    if (ret == -1) {
+        ERR("Unable To Set Permissions: %p: %s", addr, strerror(errno));
+    }
+}
+void _patch(const char *file, int line, void *start, unsigned char patch[4]) {
+    if (((uint32_t) start) % 4 != 0) {
+        ERR("Invalid Address");
+    }
+
+    // Get Current Permissions
+    segment_data &segment_data = get_data_for_addr(start);
+    int prot = PROT_READ;
+    if (segment_data.is_executable) {
+        prot |= PROT_EXEC;
+    }
+    if (segment_data.is_writable) {
+        prot |= PROT_WRITE;
+    }
+
+    // Allow Writing To Code Memory
+    uint32_t size = 4;
+    safe_mprotect(start, size, prot | PROT_WRITE);
+
+    // Patch
+    unsigned char *data = (unsigned char *) start;
+    PATCH_PRINTF(file, line, start, "original");
+    memcpy(data, patch, 4);
+    PATCH_PRINTF(file, line, start, "result");
+
+    // Reset Code Memory Permissions
+    safe_mprotect(start, size, prot);
+
+    // Clear ARM Instruction Cache
+    __clear_cache(start, (void *) (((uintptr_t) start) + size));
+}
+
+// Patch Address
+void _patch_address(const char *file, int line, void *start, void *target) {
+    uint32_t addr = (uint32_t) target;
+    unsigned char *patch_data = (unsigned char *) &addr;
+    _patch(file, line, start, patch_data);
+}

libreborn/src/patch/segments.cpp

@@ -0,0 +1,50 @@
+#include <vector>
+
+#include <elf.h>
+#include <dlfcn.h>
+#include <link.h>
+
+#include <libreborn/libreborn.h>
+#include "patch-internal.h"
+
+// Track Segments
+static std::vector<segment_data> &get_segments() {
+    static std::vector<segment_data> data;
+    return data;
+}
+
+// Functions
+segment_data &get_data_for_addr(void *addr) {
+    for (segment_data &data : get_segments()) {
+        if (addr >= data.start && addr < data.end) {
+            return data;
+        }
+    }
+    ERR("Address Not Part Of Main Program: %p", addr);
+}
+void add_segment(segment_data data) {
+    get_segments().push_back(data);
+}
+
+// Init
+void reborn_init_patch() {
+    dl_iterate_phdr([](struct dl_phdr_info *info, __attribute__((unused)) size_t size, __attribute__((unused)) void *user_data) {
+        // Only Search Current Program
+        if (strcmp(info->dlpi_name, "") == 0) {
+            for (int i = 0; i < info->dlpi_phnum; i++) {
+                // Only Loaded Segemnts
+                if (info->dlpi_phdr[i].p_type == PT_LOAD) {
+                    // Store
+                    segment_data data;
+                    data.start = (void *) (info->dlpi_addr + info->dlpi_phdr[i].p_vaddr);
+                    data.end = (void *) (((uintptr_t) data.start) + info->dlpi_phdr[i].p_memsz);
+                    data.is_executable = info->dlpi_phdr[i].p_flags & PF_X;
+                    data.is_writable = info->dlpi_phdr[i].p_flags & PF_W;
+                    add_segment(data);
+                }
+            }
+        }
+        // Return
+        return 0;
+    }, nullptr);
+}

libreborn/src/util/elf.c

@@ -1,28 +0,0 @@
-#include <libreborn/elf.h>
-
-// Find And Iterate Over All Segments In Current Binary
-typedef struct {
-    segment_callback_t callback;
-    void *data;
-} dl_iterate_callback_data;
-static int dl_iterate_callback(struct dl_phdr_info *info, __attribute__((unused)) size_t size, void *data) {
-    dl_iterate_callback_data *callback_data = (dl_iterate_callback_data *) data;
-    // Only Search Current Program
-    if (strcmp(info->dlpi_name, "") == 0) {
-        for (int i = 0; i < info->dlpi_phnum; i++) {
-            // Only Executable Segemnts
-            if (info->dlpi_phdr[i].p_type == PT_LOAD && (info->dlpi_phdr[i].p_flags & PF_X) != 0) {
-                // Callback
-                (*callback_data->callback)(info->dlpi_addr + info->dlpi_phdr[i].p_vaddr, info->dlpi_phdr[i].p_memsz, callback_data->data);
-            }
-        }
-    }
-    return 0;
-}
-void iterate_segments(segment_callback_t callback, void *data) {
-    dl_iterate_callback_data callback_data = {
-        .callback = callback,
-        .data = data
-    };
-    dl_iterate_phdr(dl_iterate_callback, (void *) &callback_data);
-}

mods/src/compat/bcm_host.c

@@ -1,4 +1,5 @@
 #include <libreborn/libreborn.h>
+#include "compat-internal.h"
 
 // Do Nothing Function
 static void do_nothing() {
@@ -6,7 +7,7 @@ static void do_nothing() {
 }
 
 // Patch bcm_host Calls
-__attribute__((constructor)) static void patch_bcm_host_calls() {
+void _patch_bcm_host_calls() {
     // Disable bcm_host Calls
     overwrite_call((void *) 0xdfec, (void *) do_nothing); // bcm_host_init
     overwrite_call((void *) 0x12418, (void *) do_nothing); // bcm_host_deinit

mods/src/compat/compat-internal.h

@@ -0,0 +1,5 @@
+#pragma once
+
+__attribute__((visibility("internal"))) void _patch_egl_calls();
+__attribute__((visibility("internal"))) void _patch_x11_calls();
+__attribute__((visibility("internal"))) void _patch_bcm_host_calls();

mods/src/compat/compat.c

@@ -5,6 +5,7 @@
 #include <mods/compat/compat.h>
 #include <mods/screenshot/screenshot.h>
 #include <mods/init/init.h>
+#include "compat-internal.h"
 
 #include <libreborn/libreborn.h>
 
@@ -120,6 +121,10 @@ void init_compat() {
     act_sigterm.sa_flags = SA_RESTART;
     act_sigterm.sa_handler = &exit_handler;
     sigaction(SIGTERM, &act_sigterm, NULL);
+    // Patches
+    _patch_egl_calls();
+    _patch_x11_calls();
+    _patch_bcm_host_calls();
 }
 
 // Store Exit Requests

mods/src/compat/egl.c

@@ -2,6 +2,7 @@
 
 #include <libreborn/libreborn.h>
 #include <media-layer/core.h>
+#include "compat-internal.h"
 
 // Functions That Have Their Return Values Used
 static EGLSurface eglCreateWindowSurface_injection(__attribute__((unused)) EGLDisplay display, __attribute__((unused)) EGLConfig config, __attribute__((unused)) NativeWindowType native_window, __attribute__((unused)) EGLint const *attrib_list) {
@@ -20,7 +21,7 @@ static EGLBoolean eglSwapBuffers_injection(__attribute__((unused)) EGLDisplay di
 }
 
 // Patch EGL Calls
-__attribute__((constructor)) static void patch_egl_calls() {
+void _patch_egl_calls() {
     // Disable EGL Calls
     unsigned char nop_patch[4] = {0x00, 0xf0, 0x20, 0xe3}; // "nop"
     patch((void *) 0x1250c, nop_patch); // eglTerminate

mods/src/compat/x11.c

@@ -2,6 +2,7 @@
 
 #include <libreborn/libreborn.h>
 #include <media-layer/core.h>
+#include "compat-internal.h"
 
 // Functions That Have Their Return Values Used
 static int XTranslateCoordinates_injection(__attribute__((unused)) void *display, __attribute__((unused)) XID src_w, __attribute__((unused)) XID dest_w, int src_x, int src_y, int *dest_x_return, int *dest_y_return, __attribute__((unused)) XID *child_return) {
@@ -21,7 +22,7 @@ static int XGetWindowAttributes_injection(__attribute__((unused)) void *display,
 }
 
 // Patch X11 Calls
-__attribute__((constructor)) static void patch_x11_calls() {
+void _patch_x11_calls() {
     // Disable X11 Calls
     overwrite_call((void *) 0x132a4, (void *) XGetWindowAttributes_injection); // XGetWindowAttributes
     overwrite_call((void *) 0x132d4, (void *) XTranslateCoordinates_injection); // XTranslateCoordinates

mods/src/death/death.cpp

@@ -130,11 +130,11 @@ void init_death() {
         patch_address(LocalPlayer_die_vtable_addr, (void *) LocalPlayer_die_injection);
         patch_address(ServerPlayer_actuallyHurt_vtable_addr, (void *) ServerPlayer_actuallyHurt_injection);
         patch_address(LocalPlayer_actuallyHurt_vtable_addr, (void *) LocalPlayer_actuallyHurt_injection);
-        patch_address(Mob_hurt_vtable_addr, (void *) Mob_hurt_injection);
         overwrite_calls((void *) Mob_hurt_non_virtual, (void *) Mob_hurt_injection);
     }
+
     // Fix TNT
-    // This changes PrimedTnt_explode from Level_explode(NULL, x, y, z, 3.1f) to Level_explode(this, x, y, z, 3.1f)
+    // This changes PrimedTnt_explode from Level::explode(NULL, x, y, z, 3.1f) to Level::explode(this, x, y, z, 3.1f)
     unsigned char cpy_r1_r0_patch[4] = {0x00, 0x10, 0xa0, 0xe1}; // "cpy r1, r0"
     patch((void *) 0x87998, cpy_r1_r0_patch);
     unsigned char ldr_r0_24_patch[4] = {0x24, 0x00, 0x90, 0xe5}; // "ldr r0, [r0, #0x24]"

mods/src/init/init.c

@@ -5,6 +5,7 @@
 
 __attribute__((constructor)) static void init(int argc, char *argv[]) {
     media_ensure_loaded();
+    reborn_init_patch();
     run_tests();
     init_symbols();
     init_version();

mods/src/misc/misc.c

@@ -799,7 +799,6 @@ void init_misc() {
         // Animation
         overwrite_calls((void *) ContainerMenu_constructor, (void *) ContainerMenu_injection);
         overwrite_calls((void *) ContainerMenu_destructor_complete_non_virtual, (void *) ContainerMenu_destructor_injection);
-        patch_address(ContainerMenu_destructor_complete_vtable_addr, (void *) ContainerMenu_destructor_injection);
     }
     patch_address((void *) 0x115b48, (void *) ChestTileEntity_shouldSave_injection);
 

mods/src/options/options.cpp

@@ -215,9 +215,7 @@ void _init_options_cpp() {
     // Replace "feedback_vibration" Loading/Saving With "gfx_ao"
     {
         // Replace String
-        static const char *new_feedback_vibration_options_txt_name = "gfx_ao";
+        patch_address((void *) Strings_feedback_vibration_options_txt_name_pointer, (void *) "gfx_ao");
-        patch_address((void *) Strings_feedback_vibration_options_txt_name_1_pointer, (void *) &new_feedback_vibration_options_txt_name);
-        patch_address((void *) Strings_feedback_vibration_options_txt_name_2_pointer, (void *) &new_feedback_vibration_options_txt_name);
         // Loading
         unsigned char offset = (unsigned char) offsetof(Options, ambient_occlusion);
         unsigned char gfx_ao_loading_patch[4] = {offset, 0x10, 0x84, 0xe2}; // "add r1, r4, #OFFSET"
@@ -230,8 +228,7 @@ void _init_options_cpp() {
     // Replace "gfx_lowquality" Loading With "gfx_anaglyph"
     {
         // Replace String
-        static const char *new_gfx_lowquality_options_txt_name = "gfx_anaglyph";
+        patch_address((void *) Strings_gfx_lowquality_options_txt_name_pointer, (void *) "gfx_anaglyph");
-        patch_address((void *) Strings_gfx_lowquality_options_txt_name_pointer, (void *) &new_gfx_lowquality_options_txt_name);
         // Loading
         unsigned char offset = (unsigned char) offsetof(Options, anaglyph_3d);
         unsigned char gfx_anaglyph_loading_patch[4] = {offset, 0x10, 0x84, 0xe2}; // "add r1, r4, #OFFSET"

mods/src/server/server.cpp

@@ -433,7 +433,7 @@ static bool is_ip_in_blacklist(const char *ip) {
 }
 
 // Ban Players
-static bool RakNet_RakPeer_IsBanned_injection(__attribute__((unused)) unsigned char *rakpeer, const char *ip) {
+static bool RakNet_RakPeer_IsBanned_injection(__attribute__((unused)) RakNet_RakPeer *rakpeer, const char *ip) {
     // Check List
     bool ret = is_ip_in_blacklist(ip);
     if (is_whitelist()) {
@@ -576,7 +576,7 @@ static void server_init() {
     unsigned char max_players_patch[4] = {get_max_players(), 0x30, 0xa0, 0xe3}; // "mov r3, #MAX_PLAYERS"
     patch((void *) 0x166d0, max_players_patch);
     // Custom Banned IP List
-    overwrite((void *) RakNet_RakPeer_IsBanned_non_virtual, (void *) RakNet_RakPeer_IsBanned_injection);
+    patch_address(RakNet_RakPeer_IsBanned_vtable_addr, (void *) RakNet_RakPeer_IsBanned_injection);
 
     // Show The MineCon Icon Next To MOTD In Server List
     if (get_server_properties().get_bool("show-minecon-badge", DEFAULT_SHOW_MINECON_BADGE)) {

scripts/simulate-ci.sh

@@ -2,5 +2,8 @@
 
 set -e
 
+# Change Directory
+cd "$(dirname "$0")/../"
+
 # Run
 act push -W '.gitea/workflows/build.yml'

scripts/test.sh

@@ -2,6 +2,9 @@
 
 set -e
 
+# Change Directory
+cd "$(dirname "$0")/../"
+
 # Variables
 MODE="$(echo "$1" | tr '[:upper:]' '[:lower:]')"
 ARCH='host'

symbols/src/misc/Strings.def

@@ -4,9 +4,8 @@ static-property char *default_username = 0x18fd4; // StevePi
 static-property char *minecraft_pi_version = 0x39d94; // v0.1.1 alpha
 static-property char *options_txt_path = 0x19bc8; // options.txt
 static-property char *options_txt_fopen_mode_when_loading = 0x19d24; // w
-static-property char **feedback_vibration_options_txt_name_1 = 0x198a0; // feedback_vibration
+static-property char *feedback_vibration_options_txt_name = 0x135d70; // feedback_vibration
-static-property char **feedback_vibration_options_txt_name_2 = 0x194bc; // feedback_vibration
+static-property char *gfx_lowquality_options_txt_name = 0x135d88; // gfx_lowquality
-static-property char **gfx_lowquality_options_txt_name = 0x194c4; // gfx_lowquality
 static-property char *classic_create_button_text = 0x39bec; // Create
 static-property-array char creative_mode_description = 0x104492; // Unlimited resources and flying
 static-property-array char survival_mode_description = 0x104470; // Mobs, health and gather resources