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+#  Ibex Pointer Authentication Test
+
+Ibex Pointer Authentication Test is an application to test pac/aut instructions
+added for pointer authentication. This test confirms that pac/aut instructions
+can be executed correctly, and that an exception occurs in case a pointer is
+used without authentication. We are using Ibex Simple System, so see
+`examples/simple_system/README.md` for the more details.
+
+## Prerequisites
+
+Basically, you need the prerequisites written
+`examples/simple_system/README.md`. However, please use the rv32imcb Tool
+Versions for the RISC-V Compiler Toolchain. The aut instruction executed in
+this test uses the R4-type format (three source registers rs1, rs2, rs3 and
+one destination register rd). This format is only used by floating-point
+fused multiply-add (F) and some bit-manipulation (B) instructions.
+
+Therefore, you have to use a compiler that supports the bitmanip extension.
+The required toolchain can be found
+[here](https://github.com/lowRISC/lowrisc-toolchains/releases).
+
+## Building Simulation
+
+The Simple System simulator binary can be built via FuseSoC.
+From the Ibex repository root run:
+
+```
+fusesoc --cores-root=. run --target=sim --setup --build lowrisc:ibex:ibex_simple_system --RV32M=1 --RV32E=0 --PMPEnable=1 --PointerAuthentication=1
+```
+
+## Building Software
+
+To build the pointer authentication test application, from the Ibex repository
+root run:
+
+```
+make -C examples/sw/simple_system/pa_test
+```
+
+## Running the Simulator
+
+Having built the simulator and software, from the Ibex repository root run:
+
+```
+./build/lowrisc_ibex_ibex_simple_system_0/sim-verilator/Vibex_simple_system -t --meminit=ram,./examples/sw/simple_system/pa_test/pa_test.elf
+```
+
+Outputting some simulation statistics:
+
+```
+Simulation statistics
+=====================
+Executed cycles:  1788
+Wallclock time:   1.452 s
+Simulation speed: 1231.4 cycles/s (1.2314 kHz)
+Trace file size:  485595 B
+
+You can view the simulation traces by calling
+$ gtkwave sim.fst
+
+Performance Counters
+====================
+Cycles:                     1784
+NONE:                       0
+Instructions Retired:       1259
+LSU Busy:                   5
+Fetch Wait:                 268
+Loads:                      113
+Stores:                     174
+Jumps:                      51
+Conditional Branches:       216
+Taken Conditional Branches: 183
+Compressed Instructions:    577
+Multiply Wait:              0
+Divide Wait:                0
+PAC Instructions:           2
+AUT Instructions:           1
+```
+
+The simulator produces several output files
+
+* `ibex_simple_system.log` - The ASCII output written via the output peripheral
+* `ibex_simple_system_pcount.csv` - A csv of the performance counters
+* `trace_core_00000000.log` - An instruction trace of execution
+
+Checkout ibex_simple_system.log to verify the that the exception
+due to de-referencing an unauthenticated pointer is actually happening:
+
+```
+pointer0: A0001000
+pointer1: 05CC012B
+pointer0: 00001000
+pointer1: 05CC012B
+EXCEPTION!!!
+============
+MEPC:   0x00100510
+MCAUSE: 0x00000007
+MTVAL:  0xA01FFFDC
+```