Read memory issue

[mgp25]

Hello,

While making some tests, I started facing some issues, some of them were resolved, however there is one that I am unable to solve.

At first I was getting this:

[09:01:02 753]  WARN [com.github.unidbg.arm.AbstractARMEmulator] (AbstractARMEmulator$1:67) - Write memory failed: address=0xe4000008, size=4, value=0x122691e0, PC=RX@0x1208bac8[library.so]0x8bac8, LR=RX@0x120815e0[library.so]0x815e0
54 [main] WARN com.github.unidbg.arm.AbstractARMEmulator  - Write memory failed: address=0xe4000008, size=4, value=0x122691e0, PC=RX@0x1208bac8[library.so]0x8bac8, LR=RX@0x120815e0[library.so]0x815e0
[09:01:02 754]  WARN [com.github.unidbg.AbstractEmulator] (AbstractEmulator:417) - emulate RX@0x12078770[library.so]0x78770 exception sp=unidbg@0xe4ffeda0, msg=unicorn.UnicornException: Invalid memory write (UC_ERR_WRITE_UNMAPPED), offset=137ms @ Runnable|Function32 address=0x12078770, arguments=[unidbg@0xfffe12a0, -639021477, 1059063940, 1295226194, 252651381, 1514840818, 1704064279]
55 [main] WARN com.github.unidbg.AbstractEmulator  - emulate RX@0x12078770[library.so]0x78770 exception sp=unidbg@0xe4ffeda0, msg=unicorn.UnicornException: Invalid memory write (UC_ERR_WRITE_UNMAPPED), offset=137ms @ Runnable|Function32 address=0x12078770, arguments=[unidbg@0xfffe12a0, -639021477, 1059063940, 1295226194, 252651381, 1514840818, 1704064279]

it was solved by mapping the memory on that memory range:

Backend backend = emulator.getBackend();
backend.mem_map(0xe4000000L, 0x1000, UnicornConst.UC_PROT_READ | UnicornConst.UC_PROT_WRITE);

After that, code started to work again until reaching a similar issue:

[09:05:16 332]  WARN [com.github.unidbg.arm.AbstractARMEmulator] (AbstractARMEmulator$1:67) - Read memory failed: address=0xff000000, size=4, value=0x0, PC=RX@0x12081510[library.so]0x81510, LR=RX@0x1207ad00[library.so]0x7ad00
119 [main] WARN com.github.unidbg.arm.AbstractARMEmulator  - Read memory failed: address=0xff000000, size=4, value=0x0, PC=RX@0x12081510[library.so]0x81510, LR=RX@0x1207ad00[library.so]0x7ad00
[09:05:16 333]  WARN [com.github.unidbg.AbstractEmulator] (AbstractEmulator:417) - emulate RX@0x12078770[library.so]0x78770 exception sp=unidbg@0xe4ffefb8, msg=unicorn.UnicornException: Invalid memory read (UC_ERR_READ_UNMAPPED), offset=199ms @ Runnable|Function32 address=0x12078770, arguments=[unidbg@0xfffe12a0, -639021477, 1059063940, 1295226194, 252651381, 1514840818, 1704064279]
120 [main] WARN com.github.unidbg.AbstractEmulator  - emulate RX@0x12078770[library.so]0x78770 exception sp=unidbg@0xe4ffefb8, msg=unicorn.UnicornException: Invalid memory read (UC_ERR_READ_UNMAPPED), offset=199ms @ Runnable|Function32 address=0x12078770, arguments=[unidbg@0xfffe12a0, -639021477, 1059063940, 1295226194, 252651381, 1514840818, 1704064279]

Which was resolved in a similar way:

backend.mem_map(0xff000000L, 0x4000, UnicornConst.UC_PROT_READ | UnicornConst.UC_PROT_WRITE);

And code started to work again but here is where comes the issue, it started to give:

[15:49:26 871]  WARN [com.github.unidbg.arm.AbstractARMEmulator] (AbstractARMEmulator$1:67) - Read memory failed: address=0x2a4, size=4, value=0x0, PC=RX@0x12081510[library.so]0x81510, LR=RX@0x1207ad00[library.so]0x7ad00
118 [main] WARN com.github.unidbg.arm.AbstractARMEmulator  - Read memory failed: address=0x2a4, size=4, value=0x0, PC=RX@0x12081510[library.so]0x81510, LR=RX@0x1207ad00[library.so]0x7ad00
[15:49:26 871]  WARN [com.github.unidbg.AbstractEmulator] (AbstractEmulator:417) - emulate RX@0x12078770[library.so]0x78770 exception sp=unidbg@0xe4ffefb8, msg=unicorn.UnicornException: Invalid memory read (UC_ERR_READ_UNMAPPED), offset=206ms @ Runnable|Function32 address=0x12078770, arguments=[unidbg@0xfffe12a0, -639021477, 1059063940, 1295226194, 252651381, 1514840818, 1704064279]
118 [main] WARN com.github.unidbg.AbstractEmulator  - emulate RX@0x12078770[library.so]0x78770 exception sp=unidbg@0xe4ffefb8, msg=unicorn.UnicornException: Invalid memory read (UC_ERR_READ_UNMAPPED), offset=206ms @ Runnable|Function32 address=0x12078770, arguments=[unidbg@0xfffe12a0, -639021477, 1059063940, 1295226194, 252651381, 1514840818, 1704064279]

As far as I know 0x2a4 should be mapped to:

impl.setPointer(0x2a4, _GetStringUTFChars);

Any idea on how to solve this?

Best regards