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b25: S12v2-full + B66-ELF + S16 baked

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SashegDev
2026-09-13 12:01:19 +00:00
parent 15eeba929d
commit c875e8712f
4 changed files with 197 additions and 17 deletions
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qemu/saimaa.c
+38 -8
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@@ -104,15 +104,15 @@ static void saimaa_tmr_init(Object *obj)
/* Stubs region handle for set_readonly after scaffold implant. */
static MemoryRegion *saimaa_stubs_mr;
/* DDRLOW stub trap [0x08006B80,0x08006CA0): serves the scaffolded bytes
* (S/maze/S6/banner/S7/S9/S10 stubs) on read/fetch, ignores SBL
/* DDRLOW stub trap [0x08006B80,0x08006CE0): serves the scaffolded bytes
* (S/maze/S6/banner/S7/S9/S10/S16 stubs) on read/fetch, ignores SBL
* heap-clobber writes. Uni parity: deferred-restore guard in sbl_uni.py
* (wider: [0x080068C0,0x08006CA0), also covers PBL stub).
* (wider: [0x080068C0,0x08006CE0), also covers PBL stub).
* Snapshot is taken AFTER ELF load + all stub writes (readback).
* PBL stub [0x080068C0,0x080068F4) and the ELF-text gap below stay plain
* RAM: PBL runs once (if at all), gap holds real hot SBL code. */
#define SAIMAA_DSTUB_BASE 0x08006B80
#define SAIMAA_DSTUB_SIZE 0x00000120
#define SAIMAA_DSTUB_SIZE 0x00000160
static uint8_t saimaa_dstub_mem[SAIMAA_DSTUB_SIZE];
static uint64_t saimaa_dstub_read(void *opaque, hwaddr off, unsigned size)
@@ -710,11 +710,41 @@ static void saimaa_machine_init(MachineState *machine)
uint32_t v = 0x47702000;
cpu_physical_memory_write(0x00221EF8, &v, 4);
}
/* S12-stub (b25, 2B @0x08006964): blx-to-padding becomes
* bx lr (caller ignores r0). PBL would place ARM helper. */
/* S12-stub (b25, 32B @0x08006964, ARM): blx-to-padding
* becomes movw/movt ip (=S16) + ACK peripheral bit1
* ([0x073A100], literal pool after code) + bx lr.
* PBL would place the real ARM helper here. */
{
uint16_t v = 0x4770;
cpu_physical_memory_write(0x08006964, &v, 2);
static const uint8_t s12[] = {
0xc1, 0xcc, 0x06, 0xe3, 0x00, 0xc8, 0x40, 0xe3,
0x0c, 0x30, 0x9f, 0xe5, 0x00, 0x20, 0x93, 0xe5,
0x02, 0x20, 0x82, 0xe3, 0x00, 0x20, 0x83, 0xe5,
0x1e, 0xff, 0x2f, 0xe1, 0x00, 0xa1, 0x73, 0x00,
};
size_t k;
for (k = 0; k < sizeof(s12); k += 4) {
uint32_t word = 0;
size_t n = sizeof(s12) - k < 4 ? sizeof(s12) - k : 4;
__builtin_memcpy(&word, &s12[k], n);
cpu_physical_memory_write(0x08006964 + k, &word, 4);
}
}
/* S16-stublet (b25, 18B @0x08006CC0): helper-pop chain exit.
* restore r7 (peripheral base); jump to poll resumption
* 0x8007779 via ip. Entered via B66 bx ip (ip preset by S12). */
{
static const uint8_t s16[] = {
0x4a, 0xf2, 0x00, 0x07, 0xc0, 0xf2, 0x73, 0x07,
0x47, 0xf2, 0x79, 0x7c, 0xc0, 0xf6, 0x00, 0x0c,
0x60, 0x47,
};
size_t k;
for (k = 0; k < sizeof(s16); k += 4) {
uint32_t word = 0;
size_t n = sizeof(s16) - k < 4 ? sizeof(s16) - k : 4;
__builtin_memcpy(&word, &s16[k], n);
cpu_physical_memory_write(0x08006CC0 + k, &word, 4);
}
}
{
uint32_t fill = 0x08006B8D;