Memory manager on linux + remove C23 attributes for now

include/stdint.h

@@ -37,10 +37,10 @@ typedef uint32_t uint_fast32_t, uint_least32_t;
 typedef uint64_t uint_fast64_t, uint_least64_t;
 
 // TODO: verify what size it is (on windows and linux)
-typedef intmax_t int64_t;
-typedef intptr_t int64_t;
-typedef uintmax_t uint64_t;
-typedef uintptr_t uint64_t;
+typedef int64_t  intmax_t;
+typedef int64_t  intptr_t;
+typedef uint64_t uintmax_t;
+typedef uint64_t uintptr_t;
 
 // Constant expandors
 #define INT8_C(n)    (n)

include/stdlib.h

@@ -5,7 +5,7 @@
 
 int atexit(void (*func)(void));
 int at_quick_exit(void (*func)(void));
-[[noreturn]] void abort(void);
-[[noreturn]] void exit(int code);
-[[noreturn]] void _Exit(int code);
-[[noreturn]] void quick_exit(int code);
+_Noreturn void abort(void);
+_Noreturn void exit(int code);
+_Noreturn void _Exit(int code);
+_Noreturn void quick_exit(int code);

include/tinyrt.h

@@ -42,7 +42,7 @@ static _RT_Status _rt_deinit();
 
 // Program API
 #if _RT_API_PROGRAM == 1
-    [[noreturn]] static void _rt_program_exit(int code);
+    _Noreturn static void _rt_program_exit(int code);
 #endif
 
 // Environment API
@@ -73,6 +73,6 @@ struct _RT_File {
 
 // Memory API
 #if _RT_API_MEMORY == 1
-    static _RT_Status _rt_mem_alloc(void *optional_desired_addr, u64 min_size, void **out_addr);
-    static _RT_Status _rt_mem_free(void *ptr);
+    static _RT_Status _rt_mem_alloc(void *optional_desired_addr, u64 size, void **out_addr);
+    static _RT_Status _rt_mem_free(void *ptr, u64 size);
 #endif

src/impl/cia-mem/allocator.c

@@ -25,7 +25,7 @@ static void *page_allocator_proc(void *ctx, int optype, void *old_ptr, u64 old_s
             return addr;
         } break;
         case CIA_MEM_OP_FREE: {
-            _rt_mem_free(old_ptr);
+            _rt_mem_free(old_ptr, old_size);
         } break;
         case CIA_MEM_OP_FREE_ALL: {
             return NULL;

src/impl/stdlib-program/program.c

@@ -25,13 +25,13 @@ int at_quick_exit(void (*func)(void)) {
     return 0;
 }
 
-[[noreturn]] void abort(void) {
+_Noreturn void abort(void) {
     // TODO: Ideally do a debug trap if the process is being debugged
     _rt_program_exit(1);
     __builtin_unreachable();
 }
 
-[[noreturn]] void exit(int code) {
+_Noreturn void exit(int code) {
     for(u64 i = n_atexit_handlers-1; i-- != 0; ) {
         void (*handler)(void) = atexit_handlers[i];
         handler();
@@ -42,12 +42,12 @@ int at_quick_exit(void (*func)(void)) {
     __builtin_unreachable();
 }
 
-[[noreturn]] void _Exit(int code) {
+_Noreturn void _Exit(int code) {
     _rt_program_exit(code);
     __builtin_unreachable();
 }
 
-[[noreturn]] void quick_exit(int code) {
+_Noreturn void quick_exit(int code) {
     for(u64 i = n_at_quick_exit_handlers-1; i-- != 0; ) {
         void (*handler)(void) = at_quick_exit_handlers[i];
         handler();

src/linux/syscall.c

@@ -4,7 +4,7 @@
 #define STDOUT_FILENO 1
 #define STDERR_FILENO 2
 
-// arch_prctl syscall codes
+// arch_prctl() syscall codes
 #define ARCH_SET_GS    0x1001
 #define ARCH_SET_FS    0x1002
 #define ARCH_GET_FS    0x1003
@@ -12,7 +12,7 @@
 #define ARCH_GET_CPUID 0x1011
 #define ARCH_SET_CPUID 0x1012
 
-// open syscall modes
+// open() syscall modes
 #define O_ACCMODE   0003
 #define O_RDONLY    00
 #define O_WRONLY    01
@@ -28,6 +28,18 @@
 #define O_FSYNC     O_SYNC
 #define O_ASYNC     020000
 
+// mmap() protection modes, flags and constants
+#define PROT_READ             0x1
+#define PROT_WRITE            0x2
+#define PROT_EXEC             0x4
+#define PROT_NONE             0x0
+#define PROT_GROWSDOWN 0x01000000
+#define PROT_GROWSUP   0x02000000
+#define MAP_FILE                0
+#define MAP_ANONYMOUS        0x20
+#define MAP_32BIT            0x40
+#define MAP_FAILED (void *)()
+
 #define SYS_read           0
 #define SYS_write          1
 #define SYS_open           2
@@ -165,7 +177,15 @@ static inline i64 syscall_close(u32 fd) {
     return __syscall1(SYS_close, fd);
 }
 
-static inline noreturn void syscall_exit(int code) {
+static inline void *syscall_mmap(u64 addr, u64 len, u64 prot, u64 flags, u64 fd, u64 offset) {
+    return (void *)__syscall6(SYS_mmap, addr, len, prot, flags, fd, offset);
+}
+
+static inline i64 syscall_munmap(void *addr, u64 len) {
+    return __syscall2(SYS_munmap, (u64)addr, len);
+}
+
+_Noreturn static inline void syscall_exit(int code) {
     __syscall1(SYS_exit, (i64)code);
     __builtin_unreachable();
 }

src/linux/tinyrt.c

@@ -65,6 +65,24 @@ static _RT_Status _rt_file_close(_RT_File *file) {
     return _RT_STATUS_OK;
 }
 
-[[noreturn]] static void _rt_program_exit(int code) {
+_Noreturn static void _rt_program_exit(int code) {
     syscall_exit(code);
 }
+
+static _RT_Status _rt_mem_alloc(void *optional_desired_addr, u64 size, void **out_addr) {
+    void *addr = syscall_mmap((u64)optional_desired_addr, size, PROT_READ|PROT_WRITE, MAP_ANONYMOUS, -1, 0);
+    if(addr == NULL) {
+        return _RT_ERROR_GENERIC;
+    }
+    *out_addr = addr;
+    return _RT_STATUS_OK;
+}
+
+static _RT_Status _rt_mem_free(void *ptr, u64 len) {
+    i64 result = syscall_munmap(ptr, len);
+    if(result == -1) {
+        return _RT_ERROR_GENERIC;
+    }
+    return _RT_STATUS_OK;
+}
+

src/linux/tinyrt.json

@@ -7,4 +7,4 @@
 rt_api_file: true,
 rt_api_program: true,
 rt_api_shell: false,
-rt_api_memory: false,
+rt_api_memory: true,

src/windows/tinyrt.c

@@ -69,7 +69,7 @@ static _RT_Status _rt_file_close(_RT_File *file) {
     return _RT_STATUS_OK;
 }
 
-[[noreturn]] static void _rt_program_exit(int code) {
+_Noreturn static void _rt_program_exit(int code) {
     ExitProcess(code);
     __builtin_unreachable();
 }