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| debugging. This tutorial introduces how to configure the debug environment in |
| OP-TEE enabled QEMU environment. You may also check |
| <a href="https://optee.readthedocs.io/en/latest/building/devices/qemu.html" target="_blank" rel="noopener noreferrer">OP-TEE documentation</a> |
| for more information about running QEMU for Arm v8.</p> <p>To debug TEE core running QEMU with GDB, it is necessary to disable TEE ASLR with |
| <code>CFG_CORE_ASLR ?= n</code> in <code>OP-TEE/optee_os/mk/config.mk</code>. Note that you need to |
| recompile QEMU with <code>make run</code> again. You can also choose to add the compilation |
| information directly at compile time.</p> <div class="language-sh extra-class"><pre class="language-text"><code>$ make run CFG_CORE_ASLR=n |
| </code></pre></div><p>Since we will debug the TA remotely with a <code>gdb</code> server, please also add the |
| <code>GDBSERVER=y</code> flag when compiling QEMU.</p> <p>To debug a TA, you need to first start a gdb on the host machine. Then run |
| <code>target remote :1234</code> to connect to the remote QEMU GDB server.</p> <div class="language-sh extra-class"><pre class="language-text"><code>$ ./path/to/qemu-v8-project/out-br/host/bin/aarch64-buildroot-linux-gnu-gdb |
| (gdb) target remote :1234 |
| Remote debugging using :1234 |
| warning: No executable has been specified and target does not support |
| determining executable automatically. Try using the "file" command. |
| 0xffffb30b00ea12b4 in ?? () |
| </code></pre></div><p>Next, in the GDB console, load the symbol table of the TEE core library.</p> <div class="language-sh extra-class"><pre class="language-text"><code>(gdb) symbol-file /path/to/qemu-v8-project/optee_os/out/arm/core/tee.elf |
| </code></pre></div><p>Taking <code>hello_world-rs</code> as an example, you can get the start address of the text |
| section from the log in the secure world console, which is 0x40014000.</p> <div class="language-sh extra-class"><pre class="language-text"><code>D/LD: ldelf:168 ELF (133af0ca-bdab-11eb-9130-43bf7873bf67) at 0x40014000 |
| </code></pre></div><p>Then, you can load symbols from TA file (in debug build) to the address.</p> <div class="language-sh extra-class"><pre class="language-text"><code>(gdb) add-symbol-file /path/to/examples/hello_world-rs/ta/target/aarch64-unknown-optee-trustzone/debug/ta 0x40014000 |
| </code></pre></div><p>Now, you can add breakpoints according to your own needs in the corresponding |
| functions or addresses.</p> <div class="language-sh extra-class"><pre class="language-text"><code>(gdb) b invoke_command |
| Breakpoint 2 at 0xe11bb08: invoke_command. (6 locations) |
| </code></pre></div><p>Last, initiate the boot. You can execute <code>hello_world-rs</code> in the normal world |
| console, and will see that the breakpoint we set was hit.</p> <div class="language-sh extra-class"><pre class="language-text"><code>(gdb) c |
| Continuing. |
| [Switching to Thread 1.2] |
| |
| Thread 2 hit Breakpoint 2, ta::invoke_command (cmd_id=0, params=0x4010ff00) at src/main.rs:50 |
| 50 trace_println!("[+] TA invoke command"); |
| </code></pre></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">10/19/2021, 8:23:24 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev"> |
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