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gdbstub: Add support for info proc mappings

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Currently the GDB's generate-core-file command doesn't work well with
qemu-user: the resulting dumps are huge [1] and at the same time
incomplete (argv and envp are missing). The reason is that GDB has no
access to proc mappings and therefore has to fall back to using
heuristics for discovering them. This is, in turn, because qemu-user
does not implement the Host I/O feature of the GDB Remote Serial
Protocol.

Implement vFile:{open,close,pread,readlink} and also
qXfer:exec-file:read+. With that, generate-core-file begins to work on
aarch64 and s390x.

[1] https://sourceware.org/pipermail/gdb-patches/2023-May/199432.html

Co-developed-by: Dominik 'Disconnect3d' Czarnota <dominik.b.czarnota@gmail.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230621203627.1808446-7-iii@linux.ibm.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230630180423.558337-37-alex.bennee@linaro.org>
This commit is contained in:
Ilya Leoshkevich
2023-06-30 19:04:21 +01:00
committed by Alex Bennée
parent dc14a7a6e9
commit e282010b2e
3 changed files with 185 additions and 2 deletions
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45
gdbstub/gdbstub.c
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@@ -1327,6 +1327,36 @@ static const GdbCmdParseEntry gdb_v_commands_table[] = {
.cmd = "Kill;",
.cmd_startswith = 1
},
#ifdef CONFIG_USER_ONLY
/*
* Host I/O Packets. See [1] for details.
* [1] https://sourceware.org/gdb/onlinedocs/gdb/Host-I_002fO-Packets.html
*/
{
.handler = gdb_handle_v_file_open,
.cmd = "File:open:",
.cmd_startswith = 1,
.schema = "s,L,L0"
},
{
.handler = gdb_handle_v_file_close,
.cmd = "File:close:",
.cmd_startswith = 1,
.schema = "l0"
},
{
.handler = gdb_handle_v_file_pread,
.cmd = "File:pread:",
.cmd_startswith = 1,
.schema = "l,L,L0"
},
{
.handler = gdb_handle_v_file_readlink,
.cmd = "File:readlink:",
.cmd_startswith = 1,
.schema = "s0"
},
#endif
};
static void handle_v_commands(GArray *params, void *user_ctx)
@@ -1472,11 +1502,14 @@ static void handle_query_supported(GArray *params, void *user_ctx)
";ReverseStep+;ReverseContinue+");
}
#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX)
#if defined(CONFIG_USER_ONLY)
#if defined(CONFIG_LINUX)
if (gdbserver_state.c_cpu->opaque) {
g_string_append(gdbserver_state.str_buf, ";qXfer:auxv:read+");
}
#endif
g_string_append(gdbserver_state.str_buf, ";qXfer:exec-file:read+");
#endif
if (params->len &&
strstr(get_param(params, 0)->data, "multiprocess+")) {
@@ -1615,13 +1648,21 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = {
.cmd_startswith = 1,
.schema = "s:l,l0"
},
#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX)
#if defined(CONFIG_USER_ONLY)
#if defined(CONFIG_LINUX)
{
.handler = gdb_handle_query_xfer_auxv,
.cmd = "Xfer:auxv:read::",
.cmd_startswith = 1,
.schema = "l,l0"
},
#endif
{
.handler = gdb_handle_query_xfer_exec_file,
.cmd = "Xfer:exec-file:read:",
.cmd_startswith = 1,
.schema = "l:l,l0"
},
#endif
{
.handler = gdb_handle_query_attached,