`mmap_address` too high for mips

[wtdcode]

Qiling uses 0x90000000 for linux mmap base address:

qiling/qiling/profiles/linux.ql

Line 21 in b3293e1

mmap_address = 0x90000000

According to mips memory layout: https://training.mips.com/basic_mips/PDF/Memory_Map.pdf

0x90000000 is reserved for kseg0, which userspace programs shouldn't use. Previously, Unicorn included a dirty hack to support this and we are going to remove this in unicorn-engine/unicorn#1746

Therefore, it's essential to change the mmap_address in profiles to a lower address, say 0x1000000 (note 6 zeros)

[elicn]

This should be a non brainer, but do you know whether this address would work for POSIX on other architectures? (e.g. they might expect it to be higher than some other address, etc.)
Anyway, it seems that we would need arch-specific profiles in the long run.

[wtdcode]

This should be a non brainer, but do you know whether this address would work for POSIX on other architectures? (e.g. they might expect it to be higher than some other address, etc.) Anyway, it seems that we would need arch-specific profiles in the long run.

For straightforward solution, we also provide a (note: experimental!) 1:1 memory emulation mode. In other words, all virtual memory is available and mapping to exactly the same physical address and skip all possible MMU checks (including the kseg0 check mentioned above). It could be switched by: https://github.com/unicorn-engine/unicorn/blob/51a5b68b50ec41d6693544688bc419aa53b30821/bindings/python/unicorn/unicorn.py#L809

But anyway, we don't have recent plan to release a new version due to many backlogs (your python refactor, windows memory allocation fix etc) so there is still some time for figuring out this.

Note I test 0x1000000 works for Qiling tests.

[elicn]

Fixed by #1499