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Locate executables on remote stubs without multiprocess extensions
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From: Gary Benson <gbenson@redhat.com>
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This commit allows GDB to determine filenames of main executables
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when debugging using remote stubs without multiprocess extensions.
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The qXfer:exec-file:read packet is extended to allow an empty
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annex, with the meaning that the remote stub should supply the
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filename of whatever it thinks is the current process.
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gdb/ChangeLog:
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* remote.c (remote_add_inferior): Call exec_file_locate_attach
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for fake PIDs as well as real ones.
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(remote_pid_to_exec_file): Send empty annex if PID is fake.
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gdb/doc/ChangeLog:
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* gdb.texinfo (General Query Packets): Document
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qXfer:exec-file:read with empty annex.
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gdb/gdbserver/ChangeLog:
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* server.c (handle_qxfer_exec_file): Use current process
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if annex is empty.
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---
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gdb/gdbserver/server.c | 26 +++++++++++++++++++++-----
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1 file changed, 21 insertions(+), 5 deletions(-)
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diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
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index 78cf155..c1719da 100644
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--- a/gdb/gdbserver/server.c
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+++ b/gdb/gdbserver/server.c
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@@ -29,6 +29,7 @@
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#endif
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#include "gdb_wait.h"
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#include "btrace-common.h"
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+#include "linux-low.h"
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/* The thread set with an `Hc' packet. `Hc' is deprecated in favor of
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`vCont'. Note the multi-process extensions made `vCont' a
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@@ -1012,17 +1013,32 @@ handle_qxfer_exec_file (const char *const_annex,
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gdb_byte *readbuf, const gdb_byte *writebuf,
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ULONGEST offset, LONGEST len)
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{
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- char *annex, *file;
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+ char *file;
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ULONGEST pid;
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int total_len;
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if (the_target->pid_to_exec_file == NULL || writebuf != NULL)
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return -2;
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- annex = alloca (strlen (const_annex) + 1);
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- strcpy (annex, const_annex);
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- annex = unpack_varlen_hex (annex, &pid;;
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- if (annex[0] != '\0' || pid == 0)
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+ if (const_annex[0] == '\0')
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+ {
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+ if (current_inferior == NULL)
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+ return -1;
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+
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+ pid = ptid_get_pid (current_inferior->entry.id);
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+ }
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+ else
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+ {
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+ char *annex = alloca (strlen (const_annex) + 1);
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+
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+ strcpy (annex, const_annex);
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+ annex = unpack_varlen_hex (annex, &pid;;
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+
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+ if (annex[0] != '\0')
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+ return -1;
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+ }
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+
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+ if (pid <= 0)
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return -1;
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file = (*the_target->pid_to_exec_file) (pid);
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