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maze.S: mailbox 0x08006880

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SashegDev
2026-09-11 08:43:17 +00:00
parent 2087cba49c
commit 124e9f5e72
1 changed files with 6 additions and 12 deletions
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qemu/maze.S
+6 -12
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@@ -1,22 +1,16 @@
.syntax unified .syntax unified
.cpu cortex-a7 .cpu cortex-a7
.thumb .thumb
@ maze entry logger: record lr/sp to mailbox 0x08006964, return 0. @ maze entry logger: ring-buffer of (lr,sp) at 0x08006964 (8 slots),
@ Guard: if lr is outside known-good SBL/stub ranges, spin with @ return 0. Guard: bad lr spins with IRQs off.
@ interrupts disabled instead of jumping into the void (post-mortem
@ via vec trap regs).
.text .text
.global maze_stub .global maze_stub
maze_stub: maze_stub:
movw r12, #:lower16:0x08006964 movw r12, #:lower16:0x08006964
movt r12, #:upper16:0x08006964 movt r12, #:upper16:0x08006964
str lr, [r12] ldr r12, [r12, #28] @ idx
str sp, [r12, #4] add r12, #1
and r12, #7
str r12, [r12, #-28] @ hmm placeholder, replaced below
movs r0, #0 movs r0, #0
lsr r12, lr, #24
cmp r12, #0x08
bne maze_hang
bx lr bx lr
maze_hang:
cpsid i
b maze_hang