doom is now using the native api, add a PEB + TEB to replace the dummy and the awkward argument passing to processes, all allocations are zeroed because i had enough, small readme changes and dedication.

code/syscall/syscall.h

@@ -4,6 +4,56 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
+#include <intrin.h>
+
+
+// ---------------------------------------------------------------------------
+// User process/thread environment
+// ---------------------------------------------------------------------------
+// GS base points at SYS_TEB.  GS:[0] is the process PEB pointer.
+// This is this OS' ABI, not a Windows compatibility layout.
+#define SYS_PEB_MAGIC   0x30424550u  /* "PEB0" */
+#define SYS_TEB_MAGIC   0x30424554u  /* "TEB0" */
+#define SYS_ENV_VERSION 1u
+#define SYS_CWD_MAX     512u
+
+typedef struct SYS_PEB {
+    uint32_t Magic;
+    uint32_t Version;
+    uint32_t ProcessId;
+
+    const char* ImagePath;
+    size_t      ImagePathLength;
+
+    const char* CommandLine;
+    size_t      CommandLineLength;
+
+    const char* CurrentDirectory;
+    size_t      CurrentDirectoryLength;
+} SYS_PEB;
+
+typedef struct SYS_TEB {
+    SYS_PEB*        Peb;
+    void*           StackBase;
+    void*           StackLimit;
+    struct SYS_TEB* Self;
+    uint32_t        ThreadId;
+    uint32_t        Magic;
+} SYS_TEB;
+
+static inline SYS_PEB* SysGetPeb(void) {
+    return (SYS_PEB*)(uintptr_t)__readgsqword(0);
+}
+
+static inline SYS_TEB* SysGetTeb(void) {
+    return (SYS_TEB*)(uintptr_t)__readgsqword(offsetof(SYS_TEB, Self));
+}
+
+static inline const char* SysGetCommandLine(void) {
+    SYS_PEB* peb = SysGetPeb();
+    if (!peb || peb->Magic != SYS_PEB_MAGIC) return "";
+    return peb->CommandLine ? peb->CommandLine : "";
+}
 
 // ---------------------------------------------------------------------------
 // Thread & Process Management (0-7)