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gdbstub: Implement catching syscalls

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GDB supports stopping on syscall entry and exit using the "catch
syscall" command. It relies on 3 packets, which are currently not
supported by QEMU:

* qSupported:QCatchSyscalls+ [1]
* QCatchSyscalls: [2]
* T05syscall_entry: and T05syscall_return: [3]

Implement generation and handling of these packets.

[1] https://sourceware.org/gdb/current/onlinedocs/gdb.html/General-Query-Packets.html#qSupported
[2] https://sourceware.org/gdb/current/onlinedocs/gdb.html/General-Query-Packets.html#QCatchSyscalls
[3] https://sourceware.org/gdb/current/onlinedocs/gdb.html/Stop-Reply-Packets.html

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20240202152506.279476-5-iii@linux.ibm.com>
[AJB: GString -> g_strdup_printf]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240207163812.3231697-14-alex.bennee@linaro.org>
This commit is contained in:
Ilya Leoshkevich 2024-02-07 16:38:11 +00:00 • committed by Alex Bennée
parent 0a0d87c9b8
commit 046f143c51
3 changed files with 101 additions and 0 deletions
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9
gdbstub/gdbstub.c
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@ -1617,6 +1617,7 @@ static void handle_query_supported(GArray *params, void *user_ctx)
if (gdbserver_state.c_cpu->opaque) {
g_string_append(gdbserver_state.str_buf, ";qXfer:auxv:read+");
}
g_string_append(gdbserver_state.str_buf, ";QCatchSyscalls+");
#endif
g_string_append(gdbserver_state.str_buf, ";qXfer:exec-file:read+");
#endif
@ -1810,6 +1811,14 @@ static const GdbCmdParseEntry gdb_gen_set_table[] = {
.schema = "l0"
},
#endif
#if defined(CONFIG_USER_ONLY)
{
.handler = gdb_handle_set_catch_syscalls,
.cmd = "CatchSyscalls:",
.cmd_startswith = 1,
.schema = "s0",
},
#endif
};
static void handle_gen_query(GArray *params, void *user_ctx)