feature: Add syscalls for ELF metadata parsing

src/sys/syscall.c

@@ -22,6 +22,7 @@
 #include "tty.h"
 #include "font_manager.h"
 #include "graphics.h"
+#include "app_metadata.h"
 
 extern bool ps2_ctrl_pressed;
 
@@ -2087,7 +2088,21 @@ static uint64_t sys_cmd_tty_destroy(const syscall_args_t *args) {
     return tty_destroy(tty_id);
 }
 
-#define SYS_CMD_TABLE_SIZE 76
+static uint64_t sys_cmd_get_elf_metadata(const syscall_args_t *args) {
+    const char *path = (const char *)args->arg2;
+    boredos_app_metadata_t *out = (boredos_app_metadata_t *)args->arg3;
+    if (!path || !out) return 0;
+    return app_metadata_read(path, out) ? 1 : 0;
+}
+static uint64_t sys_cmd_get_elf_primary_image(const syscall_args_t *args) {
+    const char *path     = (const char *)args->arg2;
+    char       *out_path = (char *)args->arg3;
+    size_t      out_size = (size_t)args->arg4;
+    if (!path || !out_path || !out_size) return 0;
+    return app_metadata_get_primary_image(path, out_path, out_size) ? 1 : 0;
+}
+
+#define SYS_CMD_TABLE_SIZE 78
 static const syscall_handler_fn sys_cmd_table[SYS_CMD_TABLE_SIZE] = {
     [SYSTEM_CMD_SET_BG_COLOR]        = sys_cmd_set_bg_color,
     [SYSTEM_CMD_SET_BG_PATTERN]      = sys_cmd_set_bg_pattern,
@@ -2150,6 +2165,8 @@ static const syscall_handler_fn sys_cmd_table[SYS_CMD_TABLE_SIZE] = {
     [SYSTEM_CMD_SIGACTION]           = sys_cmd_sigaction,
     [SYSTEM_CMD_SIGPROCMASK]         = sys_cmd_sigprocmask,
     [SYSTEM_CMD_SIGPENDING]          = sys_cmd_sigpending,
+    [SYSTEM_CMD_GET_ELF_METADATA]    = sys_cmd_get_elf_metadata,
+    [SYSTEM_CMD_GET_ELF_PRIMARY_IMAGE] = sys_cmd_get_elf_primary_image,
 };
 
 static uint64_t handle_sys_write(const syscall_args_t *args) {

src/sys/syscall.h

@@ -117,6 +117,8 @@ typedef struct {
 #define SYSTEM_CMD_SIGACTION 73
 #define SYSTEM_CMD_SIGPROCMASK 74
 #define SYSTEM_CMD_SIGPENDING 75
+#define SYSTEM_CMD_GET_ELF_METADATA 76
+#define SYSTEM_CMD_GET_ELF_PRIMARY_IMAGE 77
 
 void syscall_init(void);
 uint64_t syscall_handler_c(registers_t *regs);

src/userland/libc/syscall.c

@@ -335,3 +335,14 @@ void sys_parallel_run(void (*fn)(void*), void **args, int count) {
     syscall5(SYS_SYSTEM, SYSTEM_CMD_PARALLEL_RUN, (uint64_t)fn, (uint64_t)args, (uint64_t)count, 0);
 }
 
+// ELF metadata API
+int sys_get_elf_metadata(const char *path, boredos_app_metadata_t *out_metadata) {
+    return (int)syscall4(SYS_SYSTEM, SYSTEM_CMD_GET_ELF_METADATA,
+                         (uint64_t)path, (uint64_t)out_metadata, 0);
+}
+
+int sys_get_elf_primary_image(const char *path, char *out_path, size_t out_path_size) {
+    return (int)syscall5(SYS_SYSTEM, SYSTEM_CMD_GET_ELF_PRIMARY_IMAGE,
+                         (uint64_t)path, (uint64_t)out_path, (uint64_t)out_path_size, 0);
+}
+

src/userland/libc/syscall.h

@@ -97,12 +97,30 @@
 #define SYSTEM_CMD_SIGACTION 73
 #define SYSTEM_CMD_SIGPROCMASK 74
 #define SYSTEM_CMD_SIGPENDING 75
+#define SYSTEM_CMD_GET_ELF_METADATA 76
+#define SYSTEM_CMD_GET_ELF_PRIMARY_IMAGE 77
 
 #define SPAWN_FLAG_TERMINAL 0x1
 #define SPAWN_FLAG_INHERIT_TTY 0x2
 #define SPAWN_FLAG_TTY_ID 0x4
 #define SPAWN_FLAG_BACKGROUND 0x8
 
+// ELF app metadata (mirrors src/sys/elf.h, kept in sync manually)
+#define BOREDOS_APP_METADATA_MAX_APP_NAME   64
+#define BOREDOS_APP_METADATA_MAX_DESCRIPTION 192
+#define BOREDOS_APP_METADATA_MAX_IMAGES     4
+#define BOREDOS_APP_METADATA_MAX_IMAGE_PATH 160
+
+typedef struct __attribute__((packed)) {
+    uint32_t magic;
+    uint16_t version;
+    uint16_t image_count;
+    uint16_t reserved;
+    char app_name[BOREDOS_APP_METADATA_MAX_APP_NAME];
+    char description[BOREDOS_APP_METADATA_MAX_DESCRIPTION];
+    char images[BOREDOS_APP_METADATA_MAX_IMAGES][BOREDOS_APP_METADATA_MAX_IMAGE_PATH];
+} boredos_app_metadata_t;
+
 // Internal assembly entry into Ring 0
 extern uint64_t syscall0(uint64_t sys_num);
 extern uint64_t syscall1(uint64_t sys_num, uint64_t arg1);
@@ -217,5 +235,8 @@ int sys_set_dns_server(const net_ipv4_address_t *ip);
 void sys_network_force_unlock(void);
 void sys_yield(void);
 
+// ELF metadata API
+int sys_get_elf_metadata(const char *path, boredos_app_metadata_t *out_metadata);
+int sys_get_elf_primary_image(const char *path, char *out_path, size_t out_path_size);
 
 #endif