UC_ERR_WRITE_UNMAPPED error when trying to wirte to a mapped addr

[cq674350529]

When trying to write to an already mapped addr, error UC_ERR_WRITE_UNMAPPED occurred.

$ python3 test1.py 
ERROR: Invalid memory write (UC_ERR_WRITE_UNMAPPED)

And the corresponding code is as follows.

from __future__ import print_function
from unicorn import *
from unicorn.mips_const import *

# code to be emulated
MISP_CODE32 = b"\x00\x00\x00\x00"

ADDRESS = 0x90000000
ADDRESS_END = 0xabbfe000
try:
    # Initialize emulator in X86-32bit mode
    mu = Uc(UC_ARCH_MIPS, UC_MODE_MIPS32 + UC_MODE_BIG_ENDIAN)

    mu.mem_map(ADDRESS,  ADDRESS_END - ADDRESS)

    # write machine code to be emulated to memory
    mu.mem_write(ADDRESS_END - 0x1000, MISP_CODE32)

except UcError as e:
    print("ERROR: %s" % e)

The version of installed unicorn is latest version 1.0.2, the machine is Ubuntu 18.04.

$ pip3 list | grep unicorn
unicorn                       1.0.2

Thanks!

[wtdcode]

Sorry for a late reply. I'm afraid the memory area you mapped is special for MIPS. Could you please check the problem exists on Unicorn2?

[cq674350529]

Hi, I just updated unicorn with pip3 install -U unicorn==2.0.0-rc3. It seems this issue still exists.

$ python3 test1.py 
ERROR: Invalid memory write (UC_ERR_WRITE_UNMAPPED)
$ pip3 list | grep unicorn
unicorn                       2.0.0rc3

[wtdcode]

Hi, I just updated unicorn with pip3 install -U unicorn==2.0.0-rc3. It seems this issue still exists.

$ python3 test1.py 
ERROR: Invalid memory write (UC_ERR_WRITE_UNMAPPED)
$ pip3 list | grep unicorn
unicorn                       2.0.0rc3

Really strange, I would have a look ASAP.

[wtdcode]

Duplicate #217

[wtdcode]

A good reference http://ww1.microchip.com/downloads/en/DeviceDoc/PIC32MX_FRM_Sect03_MemoryOrg_61115C.pdf

[github-actions]

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