From 25268153a182eef28d31ed2bc03ab7c6c0ab40e3 Mon Sep 17 00:00:00 2001 From: John Baldwin Date: Tue, 17 Feb 2015 19:15:45 -0500 Subject: [PATCH] Use kinfo_getvmmap on FreeBSD to enumerate memory regions. Use kinfo_getvmmap from libutil on FreeBSD to enumerate memory regions in a running process instead of /proc//map. FreeBSD systems do not mount procfs by default, but kinfo_getvmmap uses a sysctl that is always available. Skip memory regions for devices as well as regions an application has requested to not be dumped via the MAP_NOCORE flag to mmap or MADV_NOCORE advice to madvise. gdb/ChangeLog: * configure.ac: AC_CHECK_LIB(util, kinfo_getvmmap). * configure: Regenerate. * config.in: Regenerate. * fbsd-nat.c [!HAVE_KINFO_GETVMMAP] (fbsd_read_mapping): Don't define. (fbsd_find_memory_regions): Use kinfo_getvmmap to enumerate memory regions if present. --- gdb/ChangeLog | 10 ++++++++ gdb/config.in | 3 +++ gdb/configure | 60 +++++++++++++++++++++++++++++++++++++++++++++ gdb/configure.ac | 5 ++++ gdb/fbsd-nat.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 141 insertions(+) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index ed21f3f923d..dd9d9e24296 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,13 @@ +2015-03-13 John Baldwin + + * configure.ac: AC_SEARCH_LIBS(kinfo_getvmmap, util). + * config.in: Regenerate. + * configure: Regenerate. + * fbsd-nat.c [!HAVE_KINFO_GETVMMAP] (fbsd_read_mapping): Don't + define. + (fbsd_find_memory_regions): Use kinfo_getvmmap to + enumerate memory regions if present. + 2015-03-13 John Baldwin * amd64fbsd-tdep.c (amd64fbsd_sigtramp_p): Style fixes. diff --git a/gdb/config.in b/gdb/config.in index 3ccac37e238..8a27df0c1e3 100644 --- a/gdb/config.in +++ b/gdb/config.in @@ -213,6 +213,9 @@ /* Define to 1 if you have the header file. */ #undef HAVE_INTTYPES_H +/* Define to 1 if your system has the kinfo_getvmmap function. */ +#undef HAVE_KINFO_GETVMMAP + /* Define if you have and nl_langinfo(CODESET). */ #undef HAVE_LANGINFO_CODESET diff --git a/gdb/configure b/gdb/configure index cca0aebd5cc..78d206b837a 100755 --- a/gdb/configure +++ b/gdb/configure @@ -7159,6 +7159,66 @@ if test "$ac_res" != no; then : fi +# On FreeBSD we may need libutil for kinfo_getvmmap (used by fbsd-nat.c). +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing kinfo_getvmmap" >&5 +$as_echo_n "checking for library containing kinfo_getvmmap... " >&6; } +if test "${ac_cv_search_kinfo_getvmmap+set}" = set; then : + $as_echo_n "(cached) " >&6 +else + ac_func_search_save_LIBS=$LIBS +cat confdefs.h - <<_ACEOF >conftest.$ac_ext +/* end confdefs.h. */ + +/* Override any GCC internal prototype to avoid an error. + Use char because int might match the return type of a GCC + builtin and then its argument prototype would still apply. */ +#ifdef __cplusplus +extern "C" +#endif +char kinfo_getvmmap (); +int +main () +{ +return kinfo_getvmmap (); + ; + return 0; +} +_ACEOF +for ac_lib in '' util; do + if test -z "$ac_lib"; then + ac_res="none required" + else + ac_res=-l$ac_lib + LIBS="-l$ac_lib $ac_func_search_save_LIBS" + fi + if ac_fn_c_try_link "$LINENO"; then : + ac_cv_search_kinfo_getvmmap=$ac_res +fi +rm -f core conftest.err conftest.$ac_objext \ + conftest$ac_exeext + if test "${ac_cv_search_kinfo_getvmmap+set}" = set; then : + break +fi +done +if test "${ac_cv_search_kinfo_getvmmap+set}" = set; then : + +else + ac_cv_search_kinfo_getvmmap=no +fi +rm conftest.$ac_ext +LIBS=$ac_func_search_save_LIBS +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_kinfo_getvmmap" >&5 +$as_echo "$ac_cv_search_kinfo_getvmmap" >&6; } +ac_res=$ac_cv_search_kinfo_getvmmap +if test "$ac_res" != no; then : + test "$ac_res" = "none required" || LIBS="$ac_res $LIBS" + +$as_echo "#define HAVE_KINFO_GETVMMAP 1" >>confdefs.h + +fi + + diff --git a/gdb/configure.ac b/gdb/configure.ac index 4a0b6a3413c..38747e8b03d 100644 --- a/gdb/configure.ac +++ b/gdb/configure.ac @@ -537,6 +537,11 @@ AM_ZLIB # On HP/UX we may need libxpdl for dlgetmodinfo (used by solib-pa64.c). AC_SEARCH_LIBS(dlgetmodinfo, [dl xpdl]) +# On FreeBSD we may need libutil for kinfo_getvmmap (used by fbsd-nat.c). +AC_SEARCH_LIBS(kinfo_getvmmap, util, + [AC_DEFINE(HAVE_KINFO_GETVMMAP, 1, + [Define to 1 if your system has the kinfo_getvmmap function. ])]) + AM_ICONV # GDB may fork/exec the iconv program to get the list of supported character diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c index 062eede891e..1ce197d18f6 100644 --- a/gdb/fbsd-nat.c +++ b/gdb/fbsd-nat.c @@ -26,6 +26,10 @@ #include #include #include +#ifdef HAVE_KINFO_GETVMMAP +#include +#include +#endif #include "elf-bfd.h" #include "fbsd-nat.h" @@ -62,6 +66,64 @@ fbsd_pid_to_exec_file (struct target_ops *self, int pid) return NULL; } +#ifdef HAVE_KINFO_GETVMMAP +/* Iterate over all the memory regions in the current inferior, + calling FUNC for each memory region. OBFD is passed as the last + argument to FUNC. */ + +int +fbsd_find_memory_regions (struct target_ops *self, + find_memory_region_ftype func, void *obfd) +{ + pid_t pid = ptid_get_pid (inferior_ptid); + struct kinfo_vmentry *vmentl, *kve; + uint64_t size; + struct cleanup *cleanup; + int i, nitems; + + vmentl = kinfo_getvmmap (pid, &nitems); + if (vmentl == NULL) + perror_with_name (_("Couldn't fetch VM map entries.")); + cleanup = make_cleanup (free, vmentl); + + for (i = 0; i < nitems; i++) + { + kve = &vmentl[i]; + + /* Skip unreadable segments and those where MAP_NOCORE has been set. */ + if (!(kve->kve_protection & KVME_PROT_READ) + || kve->kve_flags & KVME_FLAG_NOCOREDUMP) + continue; + + /* Skip segments with an invalid type. */ + if (kve->kve_type != KVME_TYPE_DEFAULT + && kve->kve_type != KVME_TYPE_VNODE + && kve->kve_type != KVME_TYPE_SWAP + && kve->kve_type != KVME_TYPE_PHYS) + continue; + + size = kve->kve_end - kve->kve_start; + if (info_verbose) + { + fprintf_filtered (gdb_stdout, + "Save segment, %ld bytes at %s (%c%c%c)\n", + (long) size, + paddress (target_gdbarch (), kve->kve_start), + kve->kve_protection & KVME_PROT_READ ? 'r' : '-', + kve->kve_protection & KVME_PROT_WRITE ? 'w' : '-', + kve->kve_protection & KVME_PROT_EXEC ? 'x' : '-'); + } + + /* Invoke the callback function to create the corefile segment. + Pass MODIFIED as true, we do not know the real modification state. */ + func (kve->kve_start, size, kve->kve_protection & KVME_PROT_READ, + kve->kve_protection & KVME_PROT_WRITE, + kve->kve_protection & KVME_PROT_EXEC, 1, obfd); + } + do_cleanups (cleanup); + return 0; +} +#else static int fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end, char *protection) @@ -137,3 +199,4 @@ fbsd_find_memory_regions (struct target_ops *self, do_cleanups (cleanup); return 0; } +#endif -- 2.30.2