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S16v3: add sp un-leak

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lumia-emu
2026-09-13 12:13:59 +00:00
parent 7a77e33eda
commit 7af645ef45
3 changed files with 20 additions and 14 deletions
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qemu/saimaa.c
+11 -9
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@@ -751,18 +751,20 @@ static void saimaa_machine_init(MachineState *machine)
cpu_physical_memory_write(0x08006964 + k, &word, 4);
}
}
/* S16-stublet (b25, 44B @0x08006CC0): smart return for the
* B66 bx-ip chain. ip odd + top 8 (code) => bx ip (legit
* pushed-lr return); else default (restore r7, jump poll
/* S16-stublet (b27, 50B @0x08006CC0): smart return for the
* B66 bx-ip chain. ip odd + top 8 => add sp,#8 (pop the
* helper frame B66 skipped!) + bx ip (legit pushed-lr,
* un-leaks the stack); else default (restore r7, jump poll
* resumption 0x8007779 via ip). */
{
static const uint8_t s16[] = {
0x1c, 0xf0, 0x01, 0x0f, 0x09, 0xd0, 0x5f, 0xea,
0x1c, 0x63, 0x08, 0x2b, 0x00, 0xd1, 0x60, 0x47,
0x5f, 0xea, 0x1c, 0x73, 0x08, 0x2b, 0x00, 0xd1,
0x60, 0x47, 0x4a, 0xf2, 0x00, 0x07, 0xc0, 0xf2,
0x73, 0x07, 0x47, 0xf2, 0x79, 0x7c, 0xc0, 0xf6,
0x00, 0x08, 0xc0, 0x47,
0xdd, 0xf8, 0x04, 0xc0, 0x1c, 0xf0, 0x01, 0x0f,
0x0b, 0xd0, 0x5f, 0xea, 0x1c, 0x63, 0x08, 0x2b,
0x00, 0xd1, 0x02, 0xb0, 0x60, 0x47, 0x5f, 0xea,
0x1c, 0x73, 0x08, 0x2b, 0x00, 0xd1, 0x60, 0x47,
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) {