Implementing catch syscall.

* amd64-linux-tdep.c: Include xml-syscall.h header, define the XML
syscall name for the architecture.
(amd64_linux_get_syscall_number): New function.
(amd64_linux_init_abi): Register the correct functions for syscall
catchpoint; set the correct syscall file name.
* breakpoint.c: New include: xml-syscall.h.
(set_raw_breakpoint_without_location): Setting the parameters
for the catch syscall feature.
(insert_catch_syscall): New.
(remove_catch_syscall): New.
(breakpoint_hit_catch_syscall): New.
(print_it_catch_syscall): New.
(print_one_catch_syscall): New.
(print_mention_catch_syscall): New.
(catch_syscall_breakpoint_ops): New.
(syscall_catchpoint_p): New.
(create_catchpoint_without_mention): New.
(create_catchpoint): Modified in order to use
create_catchpoint_without_mention.
(create_syscall_event_catchpoint): New.
(clean_up_filters): New.
(catch_syscall_split_args): New.
(catch_syscall_command_1): New.
(delete_breakpoint): Add cleanup for catch syscall.
(is_syscall_catchpoint_enabled): New.
(catch_syscall_enabled): New.
(catching_syscall_number): New.
(catch_syscall_completer): New completer function.
(add_catch_command): Add the completer function for catchpoints.
* breakpoint.h (syscalls_to_be_caught): New vector.
(catch_syscall_enabled): New.
(catching_syscall_number): New.
* gdbarch.c: Regenerated.
* gdbarch.h: Regenerated.
* gdbarch.sh: Add syscall catchpoint functions and structures.
(get_syscall_number): New.
(UNKNOWN_SYSCALL): New definition.
* i386-linux-nat.c (i386_linux_resume): Select the proper request
to be made for ptrace() considering if we are catching syscalls
or not.
* i386-linux-tdep.c: Include xml-syscall.h header, define the XML
syscall name for the architecture.
(i386_linux_get_syscall_number): New.
(i386_linux_init_abi): Register the correct functions for syscall
catchpoint; set the correct syscall file name.
* inf-child.c (inf_child_set_syscall_catchpoint): New.
(inf_child_target): Assign default values to target_ops.
* inf-ptrace.c (inf_ptrace_resume): Select the proper request
to be made for ptrace() considering if we are catching syscalls
or not.
* inferior.h (struct inferior): Included new variables
any_syscall_count, syscalls_counts and total_syscalls_count,
used to keep track of requested syscall catchpoints.
* infrun.c (resume): Add syscall catchpoint.
(deal_with_syscall_event): New.
(handle_inferior_event): Add syscall entry/return events.
(inferior_has_called_syscall): New.
* linux-nat.c: Define some helpful variables to track wether we have
support for the needed ptrace option.
(linux_test_for_tracesysgood): New.
(linux_supports_tracesysgood): New.
(linux_enable_tracesysgood): New.
(linux_enable_event_reporting): Save the current used ptrace
options.
(linux_child_post_attach): Calling linux_enable_tracesysgood.
(linux_child_post_startup_inferior): Likewise.
(linux_child_set_syscall_catchpoint): New function.
(linux_handle_extended_wait): Handle the case which the inferior stops
because it has called or returned from a syscall.
(linux_target_install_ops): Install the necessary functions to handle
syscall catchpoints.
* linux-nat.h (struct lwp_info): Include syscall_state into the
structure, which indicates if we are in a syscall entry or return.
* ppc-linux-tdep.c: Include xml-syscall.h header, define the XML
syscall filename for the arch.
(ppc_linux_get_syscall_number): New.
(ppc_linux_init_abi): Register the correct functions for syscall
catchpoint; setting the correct name for the XML syscall file.
* target.c (update_current_target): Update/copy functions related to
syscall catchpoint.
(target_waitstatus_to_string): Add syscall catchpoint entry/return
events.
* target.h (struct target_waitstatus): Add syscall number.
(struct syscall): New struct to hold information about syscalls
in the system.
(struct target_ops): Add ops for syscall catchpoint.
(inferior_has_called_syscall): New.
(target_set_syscall_catchpoint): New.
* xml-support.c (xml_fetch_content_from_file): New function,
transferred from xml-tdesc.c.
* xml-support.h (xml_fetch_content_from_file): New.
* xml-tdesc.c (fetch_xml_from_file): Function removed;
transferred to xml-support.c.
(file_read_description_xml): Updated to use the new
xml_fetch_content_from_file function.
* syscalls/gdb-syscalls.dtd: New definition file for syscall's XML
support.
* syscalls/amd64-linux.xml: New file containing information about
syscalls for GNU/Linux systems that use amd64 architecture.
* syscalls/i386-linux.xml: New file containing information about
syscalls for GNU/Linux systems that use i386 architecture.
* syscalls/ppc-linux.xml: New file containing information about
syscalls for GNU/Linux systems that use PPC architecture.
* syscalls/ppc64-linux.xml: New file containing information about
syscalls for GNU/Linux systems that use PPC64 architecture.
* xml-syscall.c: New file containing functions for manipulating
syscall's XML files.
* xml-syscall.h: New file, exporting the functions above mentioned.
* Makefile.in: Support for relocatable GDB datadir and XML
syscall.
* NEWS: Added information about the catch syscall feature.
* doc/gdb.texinfo (Set Catchpoints): Documentation about the new
feature.
* testsuite/Makefile.in: Inclusion of catch-syscall object.
* testsuite/gdb.base/catch-syscall.c: New file.
* testsuite/gdb.base/catch-syscall.exp: New file.

1 files changed, 2 insertions, 65 deletions

diff --git a/gdb/xml-tdesc.c b/gdb/xml-tdesc.c
index 4fa78439bef..102049f2966 100644
--- a/gdb/xml-tdesc.c
+++ b/gdb/xml-tdesc.c
@@ -426,69 +426,6 @@ tdesc_parse_xml (const char *document, xml_fetch_another fetcher,
 #endif /* HAVE_LIBEXPAT */
 
 
-/* Open FILENAME, read all its text into memory, close it, and return
-   the text.  If something goes wrong, return NULL and warn.  */
-
-static char *
-fetch_xml_from_file (const char *filename, void *baton)
-{
-  const char *dirname = baton;
-  FILE *file;
-  struct cleanup *back_to;
-  char *text;
-  size_t len, offset;
-
-  if (dirname && *dirname)
-    {
-      char *fullname = concat (dirname, "/", filename, (char *) NULL);
-      if (fullname == NULL)
-	nomem (0);
-      file = fopen (fullname, FOPEN_RT);
-      xfree (fullname);
-    }
-  else
-    file = fopen (filename, FOPEN_RT);
-
-  if (file == NULL)
-    return NULL;
-
-  back_to = make_cleanup_fclose (file);
-
-  /* Read in the whole file, one chunk at a time.  */
-  len = 4096;
-  offset = 0;
-  text = xmalloc (len);
-  make_cleanup (free_current_contents, &text);
-  while (1)
-    {
-      size_t bytes_read;
-
-      /* Continue reading where the last read left off.  Leave at least
-	 one byte so that we can NUL-terminate the result.  */
-      bytes_read = fread (text + offset, 1, len - offset - 1, file);
-      if (ferror (file))
-	{
-	  warning (_("Read error from \"%s\""), filename);
-	  do_cleanups (back_to);
-	  return NULL;
-	}
-
-      offset += bytes_read;
-
-      if (feof (file))
-	break;
-
-      len = len * 2;
-      text = xrealloc (text, len);
-    }
-
-  fclose (file);
-  discard_cleanups (back_to);
-
-  text[offset] = '\0';
-  return text;
-}
-
 /* Read an XML target description from FILENAME.  Parse it, and return
    the parsed description.  */
 
@@ -500,7 +437,7 @@ file_read_description_xml (const char *filename)
   struct cleanup *back_to;
   char *dirname;
 
-  tdesc_str = fetch_xml_from_file (filename, NULL);
+  tdesc_str = xml_fetch_content_from_file (filename, NULL);
   if (tdesc_str == NULL)
     {
       warning (_("Could not open \"%s\""), filename);
@@ -513,7 +450,7 @@ file_read_description_xml (const char *filename)
   if (dirname != NULL)
     make_cleanup (xfree, dirname);
 
-  tdesc = tdesc_parse_xml (tdesc_str, fetch_xml_from_file, dirname);
+  tdesc = tdesc_parse_xml (tdesc_str, xml_fetch_content_from_file, dirname);
   do_cleanups (back_to);
 
   return tdesc;