From: Xiong Nandi <xndchn@gmail.com>
To: qemu-devel@nongnu.org
Subject: [PATCH] system/physmem: Fix cpu_memory_rw_debug for armv7m MPU
Date: Wed, 20 Nov 2024 23:15:14 +0800 [thread overview]
Message-ID: <20241120151515.56884-1-xndchn@gmail.com> (raw)
The actual page size (region size for MPU) of armv7m may
smaller than TARGET_PAGE_SIZE (2^5 vs 2^10). So we should
use the actual virtual address to get the phys page address.
Since address_space_rw do not check the region protection, so
if we have some region like [0x0020 ~ 0x003F rw], [0x0040 ~ 0x007F --],
we will be able to read out the whole [0x0020 ~ 0x007F] region.
As a debug function, this seems acceptable.
I have make a minimal reproducible demo here:
https://gist.github.com/xndcn/3c534818b6486ecd2414d1cc7925c372
after building main.elf, run:
qemu-system-arm -machine stm32vldiscovery -kernel main.elf -s &
gdb-multiarch main.elf
(gdb) target remote :1234
(gdb) disas main
Dump of assembler code for function main:
0x08000040 <+0>: Cannot access memory at address 0x8000040
next reply other threads:[~2024-11-20 16:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-20 15:15 Xiong Nandi [this message]
2024-11-20 15:15 ` [PATCH] system/physmem: Fix cpu_memory_rw_debug for armv7m MPU Xiong Nandi
2024-11-22 20:32 ` Richard Henderson
2024-11-24 4:30 ` xndcn
2024-11-24 21:23 ` Richard Henderson
2024-11-25 2:50 ` xndcn
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