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IMEM poison drift-trap

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lumia-emu
2026-09-13 12:25:25 +00:00
parent 1478602b70
commit 95e52319f9
2 changed files with 14 additions and 0 deletions
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qemu/saimaa.c
+9
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@@ -808,6 +808,15 @@ static void saimaa_machine_init(MachineState *machine)
cpu_physical_memory_write(a, &fill, 4);
}
}
/* IMEM poison [0x8600000,0x8600F00): drift-sink trap (UDF in
* both modes). IMEM stack [0x8600F00,0x8610000) intact. */
{
uint32_t p = 0xFFFFFFFF;
uint32_t a;
for (a = 0x08600000; a < 0x08600F00; a += 4) {
cpu_physical_memory_write(a, &p, 4);
}
}
/* pop-site slots -> stublets (sp values from cpu traces) */
v = 0x802f65d; /* S1 pop10 @fef0: resume sbl_main */
cpu_physical_memory_write(0x085FFF14, &v, 4);
tools/sbl_uni.py
+5
View File
@@ -436,6 +436,11 @@ def main():
"60474af20007c0f2730747f2797cc0f6000c6047"))
# stack zone fill (STUBV odd)
mu.mem_write(0x085F0000, struct.pack("<I", STUBV) * (0x10000 // 4))
# IMEM poison [0x8600000,0x8600F00): drift-sink trap. Fill/IMEM-zero
# sleds (fall-through ldr/movs/andeq) drift silently to IMEM-top
# fault; poison faults LOUDLY at drift-entry (UDF in both modes).
# IMEM stack [0x8600F00,0x8610000) left intact.
mu.mem_write(0x08600000, b"\xff\xff\xff\xff" * (0xF00 // 4))
# pop-site slots (sp values from traces)
for a, v in [(0x085FFF14, 0x802f65d), (0x085FFF1C, 0x802f665),
(0x085FFF44, 0x8013ba5), (0x085FFF5C, 0x802f681),