b24: world-switch stub + clock S11

2026-09-13 11:29:17 +00:00
parent b06f009dd0
commit d2d180feac
4 changed files with 116 additions and 6 deletions
@@ -698,6 +698,13 @@ static void saimaa_machine_init(MachineState *machine)
                uint32_t v = 0x08006B8D;
                cpu_physical_memory_write(0x080528D0, &v, 4);
            }
+            /* PBL world-switch Thumb-stub (b24, 4B @0x00221EF8):
+             * movs r0,#0; bx lr (return 0 to dispatcher, TZ deferred).
+             * Overwrites ARM trampoline head (recoverable from ELF). */
+            {
+                uint32_t v = 0x47702000;
+                cpu_physical_memory_write(0x00221EF8, &v, 4);
+            }
            {
                uint32_t fill = 0x08006B8D;
                uint32_t a;