armv7-m: tlb_set_page_full: Assertion failed

[Raphaël Poggi]

Hi,

I am currently working on adding support of a custom ASIC based on
ARMv7-M (Cortex-M3).

I have a RAM region defined as followed:

base address = 0x0021E000
size = 0x1FFC

For some reason, during memcpy performed on guest side, I have an
assertion failed:

qemu-system-arm: ../accel/tcg/cputlb.c:1169: tlb_set_page_full:
Assertion `!(iotlb & ~TARGET_PAGE_MASK)' failed.

Here are some information I was able to gather during my debugging:
- my memcpy is the following:

dest = 0x206006 (another ram region)
src = 0x21e008
size = 0x3f9

- during the access that triggers the assertion, here are the state of
some variables just before the assertion:

iotlb = 0xb03fc - ram_addr = 0xb0000 - xlat = 0x3fc - TARGET_PAGE_MASK
= 0xfffffc0

- the last two lines of the gdb backtrace from qemu process:

#4  0x0000555555de29fc in tlb_set_page_full
                              (cpu=cpu@entry=0x55555740c790,
mmu_idx=mmu_idx@entry=0x1, addr=addr@entry=0x21e400,
full=full@entry=0x7fffafffe010) at ../accel/tcg/cputlb.c:1169

#5  0x0000555555d2b5fa in arm_cpu_tlb_fill

(cs=0x55555740c790, address=0x21e400, size=<optimized out>,
access_type=MMU_DATA_LOAD, mmu_idx=0x1, probe=<optimized out>,
retaddr=0x7fffb004b3c5) at ../target/arm/tcg/tlb_helper.c:364

I am really struggling to understand what is going wrong with my very
limited knowledge of qemu.

Could someone help me ?

Many thanks,
Raphael Poggi