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, 46 insertions, 0 deletions

diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c
index f0f802c..d8211ed 100644
--- a/gdb/ppc-linux-tdep.c
+++ b/gdb/ppc-linux-tdep.c
@@ -47,6 +47,7 @@
 #include "exceptions.h"
 #include "arch-utils.h"
 #include "spu-tdep.h"
+#include "xml-syscall.h"
 
 #include "features/rs6000/powerpc-32l.c"
 #include "features/rs6000/powerpc-altivec32l.c"
@@ -64,6 +65,9 @@
 #include "features/rs6000/powerpc-isa205-vsx64l.c"
 #include "features/rs6000/powerpc-e500l.c"
 
+/* The syscall's XML filename for PPC and PPC64.  */
+#define XML_SYSCALL_FILENAME_PPC "syscalls/ppc-linux.xml"
+#define XML_SYSCALL_FILENAME_PPC64 "syscalls/ppc64-linux.xml"
 
 /* ppc_linux_memory_remove_breakpoints attempts to remove a breakpoint
    in much the same fashion as memory_remove_breakpoint in mem-break.c,
@@ -1066,6 +1070,39 @@ ppc_linux_trap_reg_p (struct gdbarch *gdbarch)
          && register_size (gdbarch, PPC_TRAP_REGNUM) > 0;
 }
 
+/* Return the current system call's number present in the
+   r0 register.  When the function fails, it returns -1.  */
+static LONGEST
+ppc_linux_get_syscall_number (struct gdbarch *gdbarch,
+                              ptid_t ptid)
+{
+  struct regcache *regcache = get_thread_regcache (ptid);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  struct cleanup *cleanbuf;
+  /* The content of a register */
+  gdb_byte *buf;
+  /* The result */
+  LONGEST ret;
+
+  /* Make sure we're in a 32- or 64-bit machine */
+  gdb_assert (tdep->wordsize == 4 || tdep->wordsize == 8);
+
+  buf = (gdb_byte *) xmalloc (tdep->wordsize * sizeof (gdb_byte));
+
+  cleanbuf = make_cleanup (xfree, buf);
+
+  /* Getting the system call number from the register.
+     When dealing with PowerPC architecture, this information
+     is stored at 0th register.  */
+  regcache_cooked_read (regcache, tdep->ppc_gp0_regnum, buf);
+
+  ret = extract_signed_integer (buf, tdep->wordsize, byte_order);
+  do_cleanups (cleanbuf);
+
+  return ret;
+}
+
 static void
 ppc_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
 {
@@ -1435,6 +1472,9 @@ ppc_linux_init_abi (struct gdbarch_info info,
   /* Handle inferior calls during interrupted system calls.  */
   set_gdbarch_write_pc (gdbarch, ppc_linux_write_pc);
 
+  /* Get the syscall number from the arch's register.  */
+  set_gdbarch_get_syscall_number (gdbarch, ppc_linux_get_syscall_number);
+
   if (tdep->wordsize == 4)
     {
       /* Until November 2001, gcc did not comply with the 32 bit SysV
@@ -1454,6 +1494,9 @@ ppc_linux_init_abi (struct gdbarch_info info,
       set_solib_svr4_fetch_link_map_offsets
         (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 
+      /* Setting the correct XML syscall filename.  */
+      set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC);
+
       /* Trampolines.  */
       tramp_frame_prepend_unwinder (gdbarch, &ppc32_linux_sigaction_tramp_frame);
       tramp_frame_prepend_unwinder (gdbarch, &ppc32_linux_sighandler_tramp_frame);
@@ -1477,6 +1520,9 @@ ppc_linux_init_abi (struct gdbarch_info info,
       set_solib_svr4_fetch_link_map_offsets
         (gdbarch, svr4_lp64_fetch_link_map_offsets);
 
+      /* Setting the correct XML syscall filename.  */
+      set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC64);
+
       /* Trampolines.  */
       tramp_frame_prepend_unwinder (gdbarch, &ppc64_linux_sigaction_tramp_frame);
       tramp_frame_prepend_unwinder (gdbarch, &ppc64_linux_sighandler_tramp_frame);