sbl b16: banner blx redirected to print stublet 0x8062150

2026-09-11 06:40:20 +00:00
parent 537e2b6b2a
commit afc151ce0c
3 changed files with 66 additions and 0 deletions
@@ -439,6 +439,27 @@ static void saimaa_machine_init(MachineState *machine)
                    cpu_physical_memory_write(0x08062140 + k, &word, 4);
                }
            }
+            /* Banner stub at 0x08062150: print r0 string via UARTDM
+             * (b16 redirects 0x802f690 blx here). Built from qemu/banner.S */
+            {
+                static const uint8_t bn[] = {
+                    0x4f, 0xf2, 0x00, 0x03, /* movw r3,#0xf000 */
+                    0xc0, 0xf2, 0x8a, 0x73, /* movt r3,#0x78a */
+                    0x10, 0xf8, 0x01, 0x1b, /* ldrb r1,[r0],#1 */
+                    0x09, 0xb1,             /* cbz r1,done */
+                    0x19, 0x67,             /* str r1,[r3,#0x70] */
+                    0xfa, 0xe7,             /* b loop */
+                    0x00, 0x20,             /* movs r0,#0 */
+                    0x70, 0x47,             /* bx lr */
+                };
+                size_t k;
+                for (k = 0; k < sizeof(bn); k += 4) {
+                    uint32_t word = 0;
+                    size_t n = sizeof(bn) - k < 4 ? sizeof(bn) - k : 4;
+                    __builtin_memcpy(&word, &bn[k], n);
+                    cpu_physical_memory_write(0x08062150 + k, &word, 4);
+                }
+            }
            /* stack zone defaults to plain-stub addr: every register
             * popped from untouched stack becomes callable (returns 0). */
            {