x86 support!

2026-10-08 10:50:42 +03:00
parent 3db75378c4
commit dc594e5e82
5 changed files with 126 additions and 3 deletions
@@ -0,0 +1,26 @@
+
+/* No libc starting point. Jump straight into action! */
+__attribute__((naked)) __attribute__((force_align_arg_pointer))
+__attribute__((noreturn)) extern void
+_start(void) {
+  __asm__ volatile("xorl    %ebp, %ebp\n"
+                   "movl    (%esp), %ecx\n"
+                   "leal    4(%esp), %edx\n"
+
+                   /* 3. Align the stack pointer to a 16-byte boundary */
+                   "andl    $-16, %esp\n"
+
+                   /* 4. Reserve stack space for main's arguments + padding
+                         We need to pass 2 arguments (8 bytes).
+                         To keep %esp 16-byte aligned before the "call",
+                         we allocate 16 bytes total. */
+                   "subl    $16, %esp\n"
+
+                   /* 5. Place arguments onto the newly aligned stack */
+                   "movl    %ecx, (%esp)\n"
+                   "movl    %edx, 4(%esp)\n"
+                   "call    plr_display_x11_main\n"
+                   "movl    %eax, %ebx\n"
+                   "movl    $1, %eax\n"
+                   "int     $0x80");
+}