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maze stub logs lr/sp to mailbox

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SashegDev
2026-09-11 07:31:35 +00:00
parent 5feb3b8332
commit 8c04899031
2 changed files with 32 additions and 4 deletions
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qemu/maze.S
+13
View File
@@ -0,0 +1,13 @@
.syntax unified
.cpu cortex-a7
.thumb
@ maze entry logger: record lr/sp to mailbox 0x08062200, return 0.
.text
.global maze_stub
maze_stub:
movw r12, #:lower16:0x08062200
movt r12, #:upper16:0x08062200
str lr, [r12]
str sp, [r12, #4]
movs r0, #0
bx lr
qemu/saimaa.c
+19 -4
View File
@@ -421,12 +421,27 @@ static void saimaa_machine_init(MachineState *machine)
uint32_t w;
uint16_t h0 = 0x2000, h1 = 0x4770; /* movs r0,#0; bx lr */
uint32_t v;
/* pointer maze in owned RAM for SBL1 struct chains */
/* pointer maze in owned RAM for SBL1 struct chains.
* STUB = mailbox logger + return-0: records lr/sp at entry
* to 0x08062200 for post-mortem, then movs r0,#0; bx lr. */
w = S + 8;
cpu_physical_memory_write(S, &w, 4);
cpu_physical_memory_write(S + 8, &STUBV, 4);
cpu_physical_memory_write(STUB, &h0, 2);
cpu_physical_memory_write(STUB + 2, &h1, 2);
cpu_physical_memory_write(S + 8, &STUB, 4);
{
/* from qemu/maze.S: movw/movt r12; str lr/sp; movs; bx */
static const uint8_t mb[] = {
0x42, 0xf2, 0x00, 0x2c, 0xc0, 0xf6, 0x06, 0x0c,
0xcc, 0xf8, 0x00, 0xe0, 0xcc, 0xf8, 0x04, 0xd0,
0x00, 0x20, 0x70, 0x47,
};
size_t k;
for (k = 0; k < sizeof(mb); k += 4) {
uint32_t word = 0;
size_t n = sizeof(mb) - k < 4 ? sizeof(mb) - k : 4;
__builtin_memcpy(&word, &mb[k], n);
cpu_physical_memory_write(STUB + k, &word, 4);
}
}
cpu_physical_memory_write(STUB + 4, &STUBV, 4);
cpu_physical_memory_write(0x087c29d18, &S, 4);
cpu_physical_memory_write(0x08050b28, &S, 4);