================ @@ -1,484 +1,49 @@ # LLDB Platform Packets -Here is a brief overview of the packets that an lldb platform server +This is a list of the packets that an lldb platform server needs to implement for the lldb testsuite to be run on a remote target device/system. These are almost all lldb extensions to the gdb-remote serial -protocol. Many of the `vFile:` packets are also described in the "Host +protocol. Many of the `vFile:` packets are also described in the "Host I/O Packets" detailed in the gdb-remote protocol documentation, although the lldb platform extensions include packets that are not defined there (`vFile:size:`, `vFile:mode:`, `vFile:symlink`, `vFile:chmod:`). -Most importantly, the flags that lldb passes to `vFile:open:` are -incompatible with the flags that gdb specifies. - -## QStartNoAckMode - -### Brief - -A request to stop sending ACK packets for each properly formatted packet. - -### Example - -A platform session will typically start like this: -``` -receive: +$QStartNoAckMode#b0 -send: + <-- ACKing the properly formatted QStartNoAckMode packet -send: $OK#9a -receive: + <-- Our OK packet getting ACKed -``` - -ACK mode is now disabled. - -## qHostInfo - -### Brief - -Describe the hardware and OS of the target system - -### Example - -``` -receive: qHostInfo -send: cputype:16777228;cpusubtype:1;ostype:ios;watchpoint_exceptions_received:before;os_version:12.1;vendor:apple;default_packet_timeout:5; -``` - -All numbers are base 10, `os_version` is a string that will be parsed as major.minor.patch. - -## qModuleInfo - -### Brief - -Get information for a module by given module path and architecture. - -The response is: -* `(uuid|md5):...;triple:...;file_offset:...;file_size...;` or -* `EXX` - for any errors - -### Example - -``` -receive: qModuleInfo:2f62696e2f6c73; -``` - -## qGetWorkingDir - -### Brief - -Get the current working directory of the platform stub in -ASCII hex encoding. - -### Example - -``` -receive: qGetWorkingDir -send: 2f4170706c65496e7465726e616c2f6c6c64622f73657474696e67732f342f5465737453657474696e67732e746573745f646973617373656d626c65725f73657474696e6773 -``` - -## QSetWorkingDir - -### Brief - -Set the current working directory of the platform stub in -ASCII hex encoding. - -### Example - -``` -receive: QSetWorkingDir:2f4170706c65496e7465726e616c2f6c6c64622f73657474696e67732f342f5465737453657474696e67732e746573745f646973617373656d626c65725f73657474696e6773 -send: OK -``` - -## qPlatform_mkdir - -### Brief - -Create a directory on the target system. - -### Example - -``` -receive: qPlatform_mkdir:000001fd,2f746d702f6131 -send: F0 -``` - -request packet has the fields: - 1. mode bits in base 16 - 2. file path in ASCII hex encoding - -response is F followed by the return value of the `mkdir()` call, -base 16 encoded. - -## qPlatform_shell - -### Brief - -Run a shell command on the target system, return the output. - -### Example - -``` -receive: qPlatform_shell:6c73202f746d702f,0000000a -send: F,0,0,<OUTPUT> -``` - -request packet has the fields: - 1. shell command in ASCII hex encoding - 2. timeout - 3. working directory in ASCII hex encoding (optional) - -Response is `F` followed by the return value of the command (base 16), -followed by another number, followed by the output of the command -in binary-escaped-data encoding. - -## qLaunchGDBServer - -### Brief - -Start a gdbserver process (`gdbserver`, `debugserver`, `lldb-server`) -on the target system. - -### Example - -``` -receive: qLaunchGDBServer;host:<HOSTNAME_LLDB_IS_ON>; -send: pid:1337;port:43001; -``` - -Request packet hostname field is not ASCII hex encoded. Hostnames -do not have `$` or `#` characters in them. - -Response to the packet is the pid of the newly launched gdbserver, -and the port it is listening for a connection on. - -When the testsuite is running, lldb may use the pid to kill off a -debugserver that doesn't seem to be responding, etc. - -## qKillSpawnedProcess - -### Brief - -Kill a process running on the target system. - -### Example - -``` -receive: qKillSpawnedProcess:1337 -send: OK -``` -The request packet has the process ID in base 10. - -## qProcessInfoPID: - -### Brief - -Gather information about a process running on the target. - -### Example - -``` -receive: qProcessInfoPID:71964 -send: pid:71964;name:612e6f7574; -``` - -The request packet has the pid encoded in base 10. - -The reply has semicolon-separated `name:value` fields, two are -shown here. `pid` is base 10 encoded. `name` is ascii hex encoded. -lldb-server can reply with many additional fields, but this is probably -enough for the testsuite. - -## qfProcessInfo - -### Brief - -Search the process table for processes matching criteria, -respond with them in multiple packets. - -### Example - -``` -receive: qfProcessInfo:name_match:equals;name:6e6f70726f6365737365786973747377697468746869736e616d65; -send: pid:3500;name:612e6f7574; -``` - -The request packet has a criteria to search for, followed by -a specific name. - -| Key | Value | Description -| ------------ | --------- | ----------- -| `name` | ascii-hex | An ASCII hex string that contains the name of the process that will be matched. -| `name_match` | enum | One of: `equals`, `starts_with`, `ends_with`, `contains` or `regex` -| `pid` | integer | A string value containing the decimal process ID -| `parent_pid` | integer | A string value containing the decimal parent process ID -| `uid` | integer | A string value containing the decimal user ID -| `gid` | integer | A string value containing the decimal group ID -| `euid` | integer | A string value containing the decimal effective user ID -| `egid` | integer | A string value containing the decimal effective group ID -| `all_users` | bool | A boolean value that specifies if processes should be listed for all users, not just the user that the platform is running as -| `triple` | ascii-hex | An ASCII hex target triple string (`x86_64`, `x86_64-apple-macosx`, `armv7-apple-ios`) - -If no criteria is given, `qfProcessInfo` will request a list of every process. - -The lldb testsuite currently only uses `name_match:equals` and the -no-criteria mode to list every process. - -The response should include any information about the process that -can be retrieved in semicolon-separated `name:value` fields. -In this example, `pid` is base 10, `name` is ASCII hex encoded. -The testsuite seems to only require these two. - -This packet only responds with one process. To get further matches to -the search, `qsProcessInfo` should be sent. - -If no process match is found, `Exx` should be returned. - -Sample packet/response: -``` -send packet: $qfProcessInfo#00 -read packet: $pid:60001;ppid:59948;uid:7746;gid:11;euid:7746;egid:11;name:6c6c6462;triple:7838365f36342d6170706c652d6d61636f7378;#00 -send packet: $qsProcessInfo#00 -read packet: $pid:59992;ppid:192;uid:7746;gid:11;euid:7746;egid:11;name:6d64776f726b6572;triple:7838365f36342d6170706c652d6d61636f7378;#00 -send packet: $qsProcessInfo#00 -read packet: $E04#00 -``` - -## qsProcessInfo - -### Brief - -Return the next process info found by the most recent `qfProcessInfo:` -packet. - -### Example - -Continues to return the results of the `qfProcessInfo`. Once all matches -have been sent, `Exx` is returned to indicate end of matches. - -## qPathComplete - -### Brief - -Get a list of matched disk files/directories by passing a boolean flag -and a partial path. - -### Example - -``` -receive: qPathComplete:0,6d61696e -send: M6d61696e2e637070 -receive: qPathComplete:1,746573 -send: M746573742f,74657374732f -``` - -If the first argument is zero, the result should contain all -files (including directories) starting with the given path. If the -argument is one, the result should contain only directories. - -The result should be a comma-separated list of hex-encoded paths. -Paths denoting a directory should end with a directory separator (`/` or `\`). - -## vFile:size - -### Brief - -Get the size of a file on the target system, filename in ASCII hex encoding. - -### Example - -``` -receive: vFile:size:2f746d702f61 -send: Fc008 -``` - -response is `F` followed by the file size in base 16. -`F-1,errno` with the errno if an error occurs, base 16. - -## vFile:mode - -### Brief - -Get the mode bits of a file on the target system, filename in ASCII hex. - -### Example - -``` -receive: vFile:mode:2f746d702f61 -send: F1ed -``` - -response is `F` followed by the mode bits in base 16, this `0x1ed` would -correspond to `0755` in octal. -`F-1,errno` with the errno if an error occurs, base 16. - -## vFile:unlink - -### Brief - -Remove a file on the target system. - -### Example - -``` -receive: vFile:unlink:2f746d702f61 -send: F0 -``` - -Argument is a file path in ascii-hex encoding. - -Response is `F` plus the return value of `unlink()` in base 16 encoding. -If unlink failed, the return value may be followed by a comma and the value of -errno in base 16 encoding. - -## vFile:symlink - -### Brief - -Create a symbolic link (symlink, soft-link) on the target system. - -### Example - -``` -receive: vFile:symlink:<SRC-FILE>,<DST-NAME> -send: F0,0 -``` - -Argument file paths are in ascii-hex encoding. -Response is `F` plus the return value of `symlink()`, base 16 encoding, -optionally followed by the value of errno if it failed, also base 16. - -## vFile:chmod / qPlatform_chmod - -### Brief - -Change the permission mode bits on a file on the target - -### Example - -``` -receive: vFile:chmod:180,2f746d702f61 -send: F0 -``` - -Arguments are the mode bits to set, base 16, and a file path in -ascii-hex encoding. -Response is `F` plus the return value of `chmod()`, base 16 encoding. - -These 2 packets do the same thing, it is not known why we ended up with 2. - -## vFile:chmod - -### Brief - -Change the permission mode bits on a file on the target. - -### Example - -``` -receive: vFile:chmod:180,2f746d702f61 -send: F0 -``` - -Arguments are the mode bits to set, base 16, and a file path in -ascii-hex encoding. -Response is `F` plus the return value of `chmod()`, base 10 encoding. - -## vFile:open - -### Brief - -Open a file on the remote system and return the file descriptor of it. - -### Example - -``` -receive: vFile:open:2f746d702f61,00000001,00000180 -send: F8 -``` - -request packet has the fields: - 1. ASCII hex encoded filename - 2. Flags passed to the open call, base 16. - Note that these are not the `oflags` that `open(2)` takes, but - are the constant values in `enum OpenOptions` from LLDB's - [`File.h`](https://github.com/llvm/llvm-project/blob/main/lldb/include/lldb/Host/File.h). - 3. Mode bits, base 16 - -response is `F` followed by the opened file descriptor in base 16. -`F-1,errno` with the errno if an error occurs, base 16. - -## vFile:close - -### Brief - -Close a previously opened file descriptor. - -### Example - -``` -receive: vFile:close:7 -send: F0 -``` - -File descriptor is in base 16. `F-1,errno` with the errno if an error occurs, -errno is base 16. - -## vFile:pread - -### Brief - -Read data from an opened file descriptor. - -### Example - -``` -receive: vFile:pread:7,1024,0 -send: F4;a'b\00 -``` - -Request packet has the fields: - 1. File descriptor, base 16 - 2. Number of bytes to be read, base 16 - 3. Offset into file to start from, base 16 - -Response is `F`, followed by the number of bytes read (base 16 encoded), a -semicolon, followed by the data in the binary-escaped-data encoding. - -## vFile:pwrite - -### Brief - -Write data to a previously opened file descriptor. - -### Example - -``` -receive: vFile:pwrite:8,0,\cf\fa\ed\fe\0c\00\00 -send: F1024 -``` - -Request packet has the fields: - 1. File descriptor, base 16 - 2. Offset into file to start from, base 16 - 3. binary-escaped-data to be written - -Response is `F`, followed by the number of bytes written (base 16 encoded). - -## Launching Processes - -Finally, the platform must be able to launch processes so that debugserver -can attach to them. To do this, the following packets should be handled: -* `QSetDisableASLR` -* `QSetDetachOnError` -* `QSetSTDOUT` -* `QSetSTDERR` -* `QSetSTDIN` -* `QEnvironment` -* `QEnvironmentHexEncoded` -* `A` -* `qLaunchSuccess` -* `qProcessInfo` - -Most of these are documented in the standard gdb-remote protocol -and/or LLDB's [GDB Remote Protocol Extensions](lldbgdbremote). +Most importantly, the flags that LLDB passes to `vFile:open:` are +incompatible with the flags that GDB specifies. + +* [QStartNoAckMode](./lldbgdbremote.md#qstartnoackmode) ---------------- DavidSpickett wrote:
You can leave titles to be automatic by doing `[](...` but then Github leaves them blank which defeats the point of Markdown being nice to edit on Github. https://github.com/llvm/llvm-project/pull/90029 _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
