AMD ROCm Debug Agent Library (ROCdebug-agent)
=============================================

Introduction
------------

The AMD ROCm Debug Agent (ROCdebug-agent) is a library that can be loaded by the
ROCm Platform Runtime (ROCr) to provide the following functionality:

- Print the state of all AMD GPU wavefronts that caused a queue error (for
  example, causing a memory violation, executing an ``s_trap 2``, or executing
  an illegal instruction).

- Print the state of all AMD GPU wavefronts by sending a SIGQUIT signal to the
  process (for example, by pressing ``Ctrl-\``) while the program is executing.

This functionality is provided for all AMD GPUs supported by the ROCm Debugger
API Library (ROCdbgapi).

Usage
-----

To display the source text location with the machine code instructions around
the wavefronts' pc, compile the AMD GPU code objects with ``-ggdb``.  In
addition, ``-O0``, while not required, will help the source text location
displayed to be more intuitive as higher optimization levels can reorder
machine code instructions.  If ``-ggdb`` is not used, source line information
will not be available and only machine code instructions starting at the
wavefronts' pc will be printed.  For example:

````sh
/opt/rocm/bin/hipcc -O0 -ggdb -o my_program my_program.cpp
````

To use the ROCdebug-agent set the ``HSA_TOOLS_LIB`` environment variable to the
file name or path of the library and the ``HSA_ENABLE_DEBUG`` environment variable
to ``1``.  For example:

````sh
HSA_TOOLS_LIB=/opt/rocm/lib/librocm-debug-agent.so.2 HSA_ENABLE_DEBUG=1 ./my_program
````

If the application encounters a triggering event, it will print the state of
some or all AMD GPU wavefronts.  For example, a sample print out is:

````console
Queue error (HSA_STATUS_ERROR_EXCEPTION: An HSAIL operation resulted in a hardware exception.)

--------------------------------------------------------
wave_1: pc=0x7fd4f100d0e8 (stopped, reason: ASSERT_TRAP)

system registers:
            m0: 00000000        status: 00012461       trapsts: 20000000          mode: 000003c0
         ttmp4: 00000001         ttmp5: 00000000         ttmp6: f51a0080         ttmp7: 000000d5
         ttmp8: 00000000         ttmp9: 00000000        ttmp10: 00000000        ttmp11: 000000c0
        ttmp13: 00000000
          exec: 0000000000000001           vcc: 0000000000000000
    xnack_mask: 0000000000012460  flat_scratch: 00807fac01000000

scalar registers:
            s0: f520c000            s1: 00007fd5            s2: 00000000            s3: 00ea4fac
            s4: f51a0080            s5: 00007fd5            s6: f520c000            s7: 00007fd5
            s8: f1002000            s9: 00007fd4           s10: 00000000           s11: 00000000
           s12: f1000000           s13: 00007fd4           s14: f1001000           s15: 00007fd4
           s16: f5186070           s17: 00007fd5           s18: f100e070           s19: 00007fd4
           s20: f5186070           s21: 00007fd5           s22: f100e070           s23: 00007fd4
           s24: 00004000           s25: 00010000

vector registers:
            v0: [0] 00000000 [1] f1002004 [2] f1002008 [3] f100200c [4] f1002010 [5] f1002014 [6] f1002018 [7] f100201c [8] f1002020 [9] f1002024 [10] f1002028 [11] f100202c [12] f1002030 [13] f1002034 [14] f1002038 [15] f100203c [16] f1002040 [17] f1002044 [18] f1002048 [19] f100204c [20] f1002050 [21] f1002054 [22] f1002058 [23] f100205c [24] f1002060 [25] f1002064 [26] f1002068 [27] f100206c [28] f1002070 [29] f1002074 [30] f1002078 [31] f100207c [32] f1002080 [33] f1002084 [34] f1002088 [35] f100208c [36] f1002090 [37] f1002094 [38] f1002098 [39] f100209c [40] f10020a0 [41] f10020a4 [42] f10020a8 [43] f10020ac [44] f10020b0 [45] f10020b4 [46] f10020b8 [47] f10020bc [48] f10020c0 [49] f10020c4 [50] f10020c8 [51] f10020cc [52] f10020d0 [53] f10020d4 [54] f10020d8 [55] f10020dc [56] f10020e0 [57] f10020e4 [58] f10020e8 [59] f10020ec [60] f10020f0 [61] f10020f4 [62] f10020f8 [63] f10020fc
            v1: [0] 00000000 [1] 00007fd4 [2] 00007fd4 [3] 00007fd4 [4] 00007fd4 [5] 00007fd4 [6] 00007fd4 [7] 00007fd4 [8] 00007fd4 [9] 00007fd4 [10] 00007fd4 [11] 00007fd4 [12] 00007fd4 [13] 00007fd4 [14] 00007fd4 [15] 00007fd4 [16] 00007fd4 [17] 00007fd4 [18] 00007fd4 [19] 00007fd4 [20] 00007fd4 [21] 00007fd4 [22] 00007fd4 [23] 00007fd4 [24] 00007fd4 [25] 00007fd4 [26] 00007fd4 [27] 00007fd4 [28] 00007fd4 [29] 00007fd4 [30] 00007fd4 [31] 00007fd4 [32] 00007fd4 [33] 00007fd4 [34] 00007fd4 [35] 00007fd4 [36] 00007fd4 [37] 00007fd4 [38] 00007fd4 [39] 00007fd4 [40] 00007fd4 [41] 00007fd4 [42] 00007fd4 [43] 00007fd4 [44] 00007fd4 [45] 00007fd4 [46] 00007fd4 [47] 00007fd4 [48] 00007fd4 [49] 00007fd4 [50] 00007fd4 [51] 00007fd4 [52] 00007fd4 [53] 00007fd4 [54] 00007fd4 [55] 00007fd4 [56] 00007fd4 [57] 00007fd4 [58] 00007fd4 [59] 00007fd4 [60] 00007fd4 [61] 00007fd4 [62] 00007fd4 [63] 00007fd4
            v2: [0] 22222222 [1] 11111125 [2] 1111111b [3] 11111123 [4] 1111111d [5] 1111111c [6] 1111111a [7] 1111111d [8] 1111111a [9] 1111111b [10] 1111111c [11] 11111118 [12] 11111123 [13] 1111111c [14] 11111119 [15] 11111117 [16] 1111111d [17] 11111114 [18] 1111111b [19] 11111117 [20] 1111111a [21] 1111111d [22] 11111118 [23] 11111120 [24] 11111118 [25] 1111111c [26] 1111111d [27] 1111111e [28] 1111111a [29] 11111122 [30] 1111111e [31] 11111120 [32] 11111123 [33] 11111119 [34] 1111111c [35] 1111111d [36] 11111116 [37] 1111111a [38] 1111111d [39] 1111111c [40] 11111113 [41] 11111115 [42] 1111111d [43] 1111111f [44] 1111111e [45] 1111111c [46] 1111111f [47] 1111111e [48] 11111117 [49] 11111115 [50] 1111111a [51] 11111121 [52] 1111111f [53] 1111111b [54] 1111111b [55] 11111124 [56] 11111116 [57] 11111125 [58] 11111123 [59] 1111111b [60] 1111111a [61] 11111119 [62] 11111118 [63] 11111123
            v3: [0] 11111111 [1] 11111111 [2] 11111111 [3] 11111111 [4] 11111111 [5] 11111111 [6] 11111111 [7] 11111111 [8] 11111111 [9] 11111111 [10] 11111111 [11] 11111111 [12] 11111111 [13] 11111111 [14] 11111111 [15] 11111111 [16] 11111111 [17] 11111111 [18] 11111111 [19] 11111111 [20] 11111111 [21] 11111111 [22] 11111111 [23] 11111111 [24] 11111111 [25] 11111111 [26] 11111111 [27] 11111111 [28] 11111111 [29] 11111111 [30] 11111111 [31] 11111111 [32] 11111111 [33] 11111111 [34] 11111111 [35] 11111111 [36] 11111111 [37] 11111111 [38] 11111111 [39] 11111111 [40] 11111111 [41] 11111111 [42] 11111111 [43] 11111111 [44] 11111111 [45] 11111111 [46] 11111111 [47] 11111111 [48] 11111111 [49] 11111111 [50] 11111111 [51] 11111111 [52] 11111111 [53] 11111111 [54] 11111111 [55] 11111111 [56] 11111111 [57] 11111111 [58] 11111111 [59] 11111111 [60] 11111111 [61] 11111111 [62] 11111111 [63] 11111111
            v4: [0] f10115b0 [1] 0000000a [2] 00000005 [3] 00000009 [4] 00000004 [5] 00000001 [6] 00000001 [7] 0000000a [8] 00000004 [9] 00000005 [10] 00000008 [11] 00000002 [12] 00000008 [13] 00000001 [14] 00000006 [15] 00000005 [16] 00000005 [17] 00000001 [18] 00000001 [19] 00000002 [20] 00000006 [21] 00000006 [22] 00000002 [23] 0000000a [24] 00000001 [25] 00000001 [26] 0000000a [27] 00000006 [28] 00000001 [29] 00000008 [30] 0000000a [31] 00000009 [32] 00000009 [33] 00000007 [34] 0000000a [35] 00000007 [36] 00000003 [37] 00000003 [38] 00000008 [39] 00000001 [40] 00000001 [41] 00000002 [42] 00000005 [43] 00000009 [44] 00000005 [45] 00000005 [46] 0000000a [47] 00000003 [48] 00000004 [49] 00000001 [50] 00000002 [51] 0000000a [52] 0000000a [53] 00000001 [54] 00000007 [55] 0000000a [56] 00000004 [57] 0000000a [58] 00000008 [59] 00000006 [60] 00000008 [61] 00000001 [62] 00000004 [63] 00000009
            v5: [0] 00007fd4 [1] 00007fd4 [2] 00007fd4 [3] 00007fd4 [4] 00007fd4 [5] 00007fd4 [6] 00007fd4 [7] 00007fd4 [8] 00007fd4 [9] 00007fd4 [10] 00007fd4 [11] 00007fd4 [12] 00007fd4 [13] 00007fd4 [14] 00007fd4 [15] 00007fd4 [16] 00007fd4 [17] 00007fd4 [18] 00007fd4 [19] 00007fd4 [20] 00007fd4 [21] 00007fd4 [22] 00007fd4 [23] 00007fd4 [24] 00007fd4 [25] 00007fd4 [26] 00007fd4 [27] 00007fd4 [28] 00007fd4 [29] 00007fd4 [30] 00007fd4 [31] 00007fd4 [32] 00007fd4 [33] 00007fd4 [34] 00007fd4 [35] 00007fd4 [36] 00007fd4 [37] 00007fd4 [38] 00007fd4 [39] 00007fd4 [40] 00007fd4 [41] 00007fd4 [42] 00007fd4 [43] 00007fd4 [44] 00007fd4 [45] 00007fd4 [46] 00007fd4 [47] 00007fd4 [48] 00007fd4 [49] 00007fd4 [50] 00007fd4 [51] 00007fd4 [52] 00007fd4 [53] 00007fd4 [54] 00007fd4 [55] 00007fd4 [56] 00007fd4 [57] 00007fd4 [58] 00007fd4 [59] 00007fd4 [60] 00007fd4 [61] 00007fd4 [62] 00007fd4 [63] 00007fd4
            v6: [0] 00007ffe [1] 00007ffe [2] 00007ffe [3] 00007ffe [4] 00007ffe [5] 00007ffe [6] 00007ffe [7] 00007ffe [8] 00007ffe [9] 00007ffe [10] 00007ffe [11] 00007ffe [12] 00007ffe [13] 00007ffe [14] 00007ffe [15] 00007ffe [16] 00007ffe [17] 00007ffe [18] 00007ffe [19] 00007ffe [20] 00007ffe [21] 00007ffe [22] 00007ffe [23] 00007ffe [24] 00007ffe [25] 00007ffe [26] 00007ffe [27] 00007ffe [28] 00007ffe [29] 00007ffe [30] 00007ffe [31] 00007ffe [32] 00007ffe [33] 00007ffe [34] 00007ffe [35] 00007ffe [36] 00007ffe [37] 00007ffe [38] 00007ffe [39] 00007ffe [40] 00007ffe [41] 00007ffe [42] 00007ffe [43] 00007ffe [44] 00007ffe [45] 00007ffe [46] 00007ffe [47] 00007ffe [48] 00007ffe [49] 00007ffe [50] 00007ffe [51] 00007ffe [52] 00007ffe [53] 00007ffe [54] 00007ffe [55] 00007ffe [56] 00007ffe [57] 00007ffe [58] 00007ffe [59] 00007ffe [60] 00007ffe [61] 00007ffe [62] 00007ffe [63] 00007ffe
            v7: [0] 3d3495ac [1] bd0dfb7a [2] bcc1143a [3] bca64d59 [4] bc112d79 [5] 3cbcc8c8 [6] 3ce69f7c [7] 3de967fe [8] bdee8d4d [9] 3c9e426b [10] bc6d380f [11] 3c18495c [12] be38843f [13] bd5a1da8 [14] 3d80c7e4 [15] bc978798 [16] 3cd52d8d [17] bd58d230 [18] 3e2e91ac [19] bca54a71 [20] 3c3cea13 [21] 3c888a4b [22] 3de0a868 [23] 3d220de3 [24] 3ce4d6f8 [25] bc033ce0 [26] bb38519f [27] b9a4b621 [28] bd800802 [29] bdb04d27 [30] bc826d02 [31] bd4aa05d [32] 3dae9483 [33] b921dac8 [34] 3d194f79 [35] bd1ccbd9 [36] bd45f9c5 [37] bc1b4cb0 [38] 3db1ab4b [39] 3e0487ab [40] 3d37f334 [41] 3b983eb8 [42] 3caba2a4 [43] bd8944ea [44] be01bee7 [45] bbbf22d8 [46] 3d076472 [47] bd2eb34c [48] 3c3da426 [49] 3d754b6d [50] 3c08a069 [51] bcdeca32 [52] be12e2e4 [53] 3c92d0e2 [54] 3d1480e4 [55] 3d817751 [56] 3db0072c [57] 3d6fc70b [58] bd6a67a1 [59] 3da0f9ed [60] 3b67b5e6 [61] bdb8002e [62] 3cd0a9b9 [63] 386eee2b

Local memory content:
    0x0000: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x0020: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x0040: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x0060: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x0080: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x00a0: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x00c0: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x00e0: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x0100: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x0120: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x0140: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x0160: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x0180: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x01a0: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x01c0: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111
    0x01e0: 22222222 11111111 22222222 11111111 22222222 11111111 22222222 11111111

Disassembly for function vector_add_assert_trap(int*, int*, int*):
    code object: file:////rocm-debug-agent/build/test/rocm-debug-agent-test#offset=14309&size=31336
    loaded at: [0x7fd4f100c000-0x7fd4f100e070]

/rocm-debug-agent/test/vector_add_assert_trap.cpp:
55        c[gid] = a[gid] + b[gid] + (lds_check[0] >> 32);
    0x7fd4f100d0c4 <+196>:    s_waitcnt vmcnt(0) lgkmcnt(0)
    0x7fd4f100d0c8 <+200>:    v_add3_u32 v2, v2, v4, v3
    0x7fd4f100d0d0 <+208>:    global_store_dword v[0:1], v2, off
    0x7fd4f100d0d8 <+216>:    s_or_saveexec_b64 s[0:1], s[0:1]
    0x7fd4f100d0dc <+220>:    s_xor_b64 exec, exec, s[0:1]
    0x7fd4f100d0e0 <+224>:    s_cbranch_execz 65503  # 0x7fd4f100d060 <vector_add_assert_trap(int*, int*, int*)+96>

53          __builtin_trap ();
    0x7fd4f100d0e4 <+228>:    s_mov_b64 s[0:1], s[6:7]
 => 0x7fd4f100d0e8 <+232>:    s_trap 2
    0x7fd4f100d0ec <+236>:    s_endpgm

End of disassembly.
Aborted (core dumped)
````

The supported triggering events are:

- __Memory fault__

  A memory fault happens when an AMD GPU accesses a page that is not
  accessible.  The information about the memory fault is printed.  For example:

  ````console
  System event (HSA_AMD_GPU_MEMORY_FAULT_EVENT: page not present or supervisor privilege, write access to a read-only page)
  Faulting page: 0x7fbe4cc01000
  ````

  There could be multiple memory faults, but the information about only one is
  printed.

  A memory fault does not specify the wavefront that caused it.  However, the
  stop reason for each wavefront is available. For example:

  ````console
  wave_0: pc=0x7fbe4cc0d0b4 (stopped, reason: MEMORY_VIOLATION)
  ````

- __Assert trap__

  This occurs when an ``s_trap 2`` instruction is executed.  The
  ``__builtin_trap()`` language builtin, or ``llvm.trap`` LLVM IR instruction,
  can be used to generate this AMD GPU instruction.

- __Illegal instruction__

  This occurs when the hardware detects an illegal instruction.

- __SIGQUIT ``(Ctrl-\)``__

  A SIGQUIT signal can be sent to a process with the ``kill -s SIGQUIT <pid>``
  command or by pressing ``Ctrl-\``.  See the ``--disable-linux-signals``
  option for more information.

Options
-------

Options are passed through the ``ROCM_DEBUG_AGENT_OPTIONS`` environment
variable.  For example:

````shell
ROCM_DEBUG_AGENT_OPTIONS="--all --save-code-objects" \
    HSA_TOOLS_LIB=librocm-debug-agent.so.2 HSA_ENABLE_DEBUG=1 ./my_program
````

The supported options are:

- __``-a``, ``--all``__

  Prints all wavefronts.

  If not specified, only wavefronts that have a triggering event are printed.

- __``-s [DIR]``, ``--save-code-objects[=DIR]``__

  Saves all loaded code objects.  If the directory is not specified, the code
  objects are saved in the current directory.

  The file name in which the code object is saved is the same as the code
  object URI with special characters replaced by ``'_'``.  For example, the
  code object URI:

  ````
  file:///rocm-debug-agent/rocm-debug-agent-test#offset=14309&size=31336
  ````
  is saved in a file with the name:
  ````
  file____rocm-debug-agent_rocm-debug-agent-test_offset_14309_size_31336
  ````

- __``-o <file-path>``, ``--output=<file-path>``__

  Saves the output produced by the ROCdebug-agent in the specified file.

  By default, the output is redirected to ``stderr``.

- __``-d``, ``--disable-linux-signals``__

  Disables installing a SIGQUIT signal handler, so that the default Linux
  handler may dump a core file.

  By default, the ROCdebug-agent installs a SIGQUIT handler to print the state of
  all wavefronts when a SIGQUIT signal is sent to the process.

- __``-l <log-level>``, ``--log-level=<log-level>``__

  Changes the ROCdebug-agent and ROCdbgapi log level. The log level can be
  `none`, `info`, `warning`, or `error`.

  The default log level is ``none``.

- __``-h``, ``--help``__

  Displays a usage message and aborts the process.

Build the ROCdebug-agent library
---------------------------------

The ROCdebug-agent library can be built on Ubuntu 18.04, Ubuntu 20.04, Centos
8.1, RHEL 8.1, and SLES 15 Service Pack 1.

Building the ROCdebug-agent library has the following prerequisites:

1. A C++17 compiler such as GCC 7 or Clang 5.

2. The AMD ROCm software stack which can be installed as part of the AMD ROCm
   release by the ``rocm-dev`` package.

3. For Ubuntu 18.04 and Ubuntu 20.04 the following adds the needed packages:

   ````shell
   apt install gcc g++ make cmake libelf-dev libdw-dev
   ````

4. For CentOS 8.1 and RHEL 8.1 the following adds the needed packages:

   ````shell
   yum install gcc gcc-c++ make cmake elfutils-libelf-devel elfutils-devel
   ````

5. For SLES 15 Service Pack 1 the following adds the needed packages:

   ````shell
   zypper install gcc gcc-c++ make cmake libelf-devel libdw-devel
   ````

6. Python version 3.6 or later is required to run the tests.

An example command-line to build and install the ROCdebug-agent library on
Linux is:

````shell
cd rocm-debug-agent
mkdir build && cd build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../install ..
make
````

Use the ``CMAKE_INSTALL_PREFIX`` to specify where the ROCdebug-agent library
should be installed.  The default location is `/usr`.

Use ``CMAKE_MODULE_PATH`` to specify a ``';'`` separated list of paths that
will be used to locate cmake modules.  It is used to locate the HIP cmake
modules required to build the tests.  The default is ``/opt/rocm/hip/cmake``

The built ROCdebug-agent library will be placed in:

- ``build/librocm-debug-agent.so.2*``

To install the ROCdebug-agent library:

````shell
make install
````

The installed ROCdebug-agent library and tests will be placed in:

- ``<install-prefix>/lib/librocm-debug-agent.so.2*``
- ``<install-prefix>/share/rocm-debug-agent/LICENSE.txt``
- ``<install-prefix>/share/rocm-debug-agent/README.md``
- ``<install-prefix>/src/rocm-debug-agent-test/*``

To use the ROCdebug-agent library, the ROCdbgapi library must be installed.
This can be installed as part of the ROCm release by the ``rocm-dbgapi``
package.

Test the ROCdebug-agent library
--------------------------------

To test the ROCdebug-agent library:

````shell
make test
````

The output should be:

````console
Running tests...
Test project /rocm-debug-agent/build
    Start 1: rocm-debug-agent-test
1/1 Test #1: rocm-debug-agent-test ............   Passed    1.59 sec

100% tests passed, 0 tests failed out of 1

Total Test time (real) =   1.59 sec
````

Tests can be run individually outside of the CTest harness.  For example:

````shell
HSA_TOOLS_LIB=librocm-debug-agent.so.2 HSA_ENABLE_DEBUG=1 test/rocm-debug-agent-test 0
HSA_TOOLS_LIB=librocm-debug-agent.so.2 HSA_ENABLE_DEBUG=1 test/rocm-debug-agent-test 1
HSA_TOOLS_LIB=librocm-debug-agent.so.2 HSA_ENABLE_DEBUG=1 test/rocm-debug-agent-test 2
````

Known Limitations and Restrictions
----------------------------------

- A disassembly of the wavefront faulting PC is only provided if it is within a
  code object.
- A disassembly of the wavefront faulting PC only includes source text
  correlation and surrounding context if the ``libdw.so`` library included with
  the distribution supports the DWARF present in the code object. Otherwise,
  the disassembly may only shows the instructions immediately after the
  faulting PC.  Ubuntu 18.04 is known to have issues in supporting DWARF 5.

Disclaimer
----------

The information contained herein is for informational purposes only and is
subject to change without notice. While every precaution has been taken in the
preparation of this document, it may contain technical inaccuracies, omissions
and typographical errors, and AMD is under no obligation to update or otherwise
correct this information.  Advanced Micro Devices, Inc. makes no
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