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Implement qXfer:exec-file:read in gdbserver
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From: Gary Benson <gbenson@redhat.com>
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This commit implements the "qXfer:exec-file:read" packet in gdbserver.
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gdb/gdbserver/ChangeLog:
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* target.h (struct target_ops) <pid_to_exec_file>: New field.
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* linux-low.c (linux_target_ops): Initialize pid_to_exec_file.
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* server.c (handle_qxfer_exec_file): New function.
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(qxfer_packets): Add exec-file entry.
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(handle_query): Report qXfer:exec-file:read as supported packet.
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---
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gdb/gdbserver/linux-low.c | 19 +++++++++++++++++++
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gdb/gdbserver/server.c | 40 ++++++++++++++++++++++++++++++++++++++++
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gdb/gdbserver/target.h | 7 +++++++
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3 files changed, 66 insertions(+)
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Index: gdb-7.6.1/gdb/gdbserver/linux-low.c
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===================================================================
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--- gdb-7.6.1.orig/gdb/gdbserver/linux-low.c 2016-03-15 19:04:39.260193747 +0100
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+++ gdb-7.6.1/gdb/gdbserver/linux-low.c 2016-03-15 19:04:48.841256052 +0100
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@@ -5993,6 +5993,24 @@
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}
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#endif /* HAVE_LINUX_BTRACE */
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+// gdb/nat/linux-procfs.c
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+static char *
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+linux_proc_pid_to_exec_file (int pid)
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+{
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+ static char buf[PATH_MAX];
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+ char name[PATH_MAX];
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+ ssize_t len;
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+
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+ xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid);
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+ len = readlink (name, buf, PATH_MAX - 1);
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+ if (len <= 0)
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+ strcpy (buf, name);
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+ else
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+ buf[len] = '\0';
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+
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+ return buf;
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+}
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+
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static struct target_ops linux_target_ops = {
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linux_create_inferior,
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linux_attach,
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@@ -6070,6 +6088,7 @@
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NULL,
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NULL,
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#endif
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+ linux_proc_pid_to_exec_file,
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};
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static void
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Index: gdb-7.6.1/gdb/gdbserver/server.c
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===================================================================
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--- gdb-7.6.1.orig/gdb/gdbserver/server.c 2016-03-15 19:04:39.262193760 +0100
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+++ gdb-7.6.1/gdb/gdbserver/server.c 2016-03-15 19:04:48.842256059 +0100
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@@ -1006,6 +1006,42 @@
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return (*the_target->read_auxv) (offset, readbuf, len);
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}
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+/* Handle qXfer:exec-file:read. */
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+
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+static int
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+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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+ ULONGEST pid;
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+ int total_len;
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+
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+ if (the_target->pid_to_exec_file == NULL || writebuf != NULL)
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+ return -2;
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+
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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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+ return -1;
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+
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+ file = (*the_target->pid_to_exec_file) (pid);
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+ if (file == NULL)
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+ return -1;
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+
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+ total_len = strlen (file);
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+
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+ if (offset > total_len)
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+ return -1;
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+
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+ if (offset + len > total_len)
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+ len = total_len - offset;
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+
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+ memcpy (readbuf, file + offset, len);
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+ return len;
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+}
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+
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/* Handle qXfer:features:read. */
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static int
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@@ -1408,6 +1444,7 @@
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{
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{ "auxv", handle_qxfer_auxv },
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{ "btrace", handle_qxfer_btrace },
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+ { "exec-file", handle_qxfer_exec_file},
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{ "fdpic", handle_qxfer_fdpic},
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{ "features", handle_qxfer_features },
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{ "libraries", handle_qxfer_libraries },
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@@ -1828,6 +1865,9 @@
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if (target_supports_stopped_by_hw_breakpoint ())
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strcat (own_buf, ";hwbreak+");
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+ if (the_target->pid_to_exec_file != NULL)
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+ strcat (own_buf, ";qXfer:exec-file:read+");
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+
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return;
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}
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Index: gdb-7.6.1/gdb/gdbserver/target.h
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===================================================================
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--- gdb-7.6.1.orig/gdb/gdbserver/target.h 2016-03-15 19:04:39.262193760 +0100
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+++ gdb-7.6.1/gdb/gdbserver/target.h 2016-03-15 19:04:48.842256059 +0100
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@@ -421,6 +421,13 @@
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to break a cyclic dependency. */
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void (*read_btrace) (struct btrace_target_info *, struct buffer *, int type);
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+ /* Return the full absolute name of the executable file that was
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+ run to create the process PID. If the executable file cannot
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+ be determined, NULL is returned. Otherwise, a pointer to a
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+ character string containing the pathname is returned. This
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+ string should be copied into a buffer by the client if the string
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+ will not be immediately used, or if it must persist. */
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+ char *(*pid_to_exec_file) (int pid);
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};
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extern struct target_ops *the_target;
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