[PATCH v4 0/3] Update FreeBSD's syscall table

[PATCH v4 0/3] Update FreeBSD's syscall table

[John Baldwin]

Relative to V4, this passes the vector of integerers via pointers
rather than non-const references.  It also adds a some documentation
to the manual.

John Baldwin (3):
  Change get_syscalls_by_group to append to an existing vector of
    integers.
  Add an optional "alias" attribute to syscall entries.
  Update the FreeBSD system call table to match FreeBSD 12.0.

 gdb/ChangeLog                  |  41 ++++++++++++
 gdb/NEWS                       |  13 ++++
 gdb/break-catch-syscall.c      |  25 ++------
 gdb/doc/ChangeLog              |   7 +++
 gdb/doc/gdb.texinfo            |  23 +++++++
 gdb/gdbarch.h                  |   3 -
 gdb/gdbarch.sh                 |   3 -
 gdb/syscalls/freebsd.xml       | 110 ++++++++++++++++++++++++++-------
 gdb/syscalls/gdb-syscalls.dtd  |   1 +
 gdb/syscalls/update-freebsd.sh |  78 +++++++++++++++++++++++
 gdb/xml-syscall.c              | 110 ++++++++++++++++-----------------
 gdb/xml-syscall.h              |  20 +++---
 12 files changed, 318 insertions(+), 116 deletions(-)
 create mode 100755 gdb/syscalls/update-freebsd.sh

-- 
2.19.2

[PATCH v4 2/3] Add an optional "alias" attribute to syscall entries.

[John Baldwin]

When setting a syscall catchpoint by name, catch syscalls whose name
or alias matches the requested string.

When the ABI of a system call is changed in the FreeBSD kernel, this
is implemented by leaving a compatibility system call using the old
ABI at the existing "slot" and allocating a new system call for the
version using the new ABI.  For example, new fields were added to the
'struct kevent' used by the kevent() system call in FreeBSD 12.  The
previous kevent() system call in FreeBSD 12 kernels is now called
freebsd11_kevent() and is still used by older binaries compiled
against the older ABI.  The freebsd11_kevent() system call can be
tagged with an "alias" attribute of "kevent" permitting 'catch syscall
kevent' to catch both system calls and providing the expected user
behavior for both old and new binaries.  It also provides the expected
behavior if GDB is compiled on an older host (such as a FreeBSD 11
host).

gdb/ChangeLog:

	* NEWS: Add entry documenting system call aliases.
	* break-catch-syscall.c (catch_syscall_split_args): Pass 'result'
	to get_syscalls_by_name.
	* gdbarch.sh (UNKNOWN_SYSCALL): Remove.
	* gdbarch.h: Regenerate.
	* syscalls/gdb-syscalls.dtd (syscall): Add alias attribute.
	* xml-syscall.c [!HAVE_LIBEXPAT] (get_syscalls_by_name): Rename
	from get_syscall_by_name.  Now accepts a pointer to a vector of
	integers and returns a bool.
	[HAVE_LIBEXPAT] (struct syscall_desc): Add alias member.
	(syscall_create_syscall_desc): Add alias parameter and pass it to
	syscall_desc constructor.
	(syscall_start_syscall): Handle alias attribute.
	(syscall_attr): Add alias attribute.
	(xml_get_syscalls_by_name): Rename from xml_get_syscall_number.
	Now accepts a pointer to a vector of integers and returns a
	bool.  Add syscalls whose alias or name matches the requested
	name.
	(get_syscalls_by_name): Rename from get_syscall_by_name.  Now
	accepts a pointer to a vector of integers and returns a bool.
	* xml-syscall.h (get_syscalls_by_name): Likewise.

gdb/doc/ChangeLog:

	* gdb.texinfo (Set Catchpoints): Add an anchor for 'catch syscall'.
	(Native): Add a FreeBSD subsection.
	(FreeBSD): Document use of system call aliases for compatibility
	system calls.
---
 gdb/ChangeLog                 | 24 ++++++++++++++
 gdb/NEWS                      | 13 ++++++++
 gdb/break-catch-syscall.c     | 11 ++-----
 gdb/doc/ChangeLog             |  7 ++++
 gdb/doc/gdb.texinfo           | 23 +++++++++++++
 gdb/gdbarch.h                 |  3 --
 gdb/gdbarch.sh                |  3 --
 gdb/syscalls/gdb-syscalls.dtd |  1 +
 gdb/xml-syscall.c             | 61 ++++++++++++++++++++---------------
 gdb/xml-syscall.h             | 10 +++---
 10 files changed, 112 insertions(+), 44 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9f2d1ccd5e..8da416e0cd 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,27 @@
+2018-11-30  John Baldwin  <jhb@FreeBSD.org>
+
+	* NEWS: Add entry documenting system call aliases.
+	* break-catch-syscall.c (catch_syscall_split_args): Pass 'result'
+	to get_syscalls_by_name.
+	* gdbarch.sh (UNKNOWN_SYSCALL): Remove.
+	* gdbarch.h: Regenerate.
+	* syscalls/gdb-syscalls.dtd (syscall): Add alias attribute.
+	* xml-syscall.c [!HAVE_LIBEXPAT] (get_syscalls_by_name): Rename
+	from get_syscall_by_name.  Now accepts a pointer to a vector of
+	integers and returns a bool.
+	[HAVE_LIBEXPAT] (struct syscall_desc): Add alias member.
+	(syscall_create_syscall_desc): Add alias parameter and pass it to
+	syscall_desc constructor.
+	(syscall_start_syscall): Handle alias attribute.
+	(syscall_attr): Add alias attribute.
+	(xml_get_syscalls_by_name): Rename from xml_get_syscall_number.
+	Now accepts a pointer to a vector of integers and returns a
+	bool.  Add syscalls whose alias or name matches the requested
+	name.
+	(get_syscalls_by_name): Rename from get_syscall_by_name.  Now
+	accepts a pointer to a vector of integers and returns a bool.
+	* xml-syscall.h (get_syscalls_by_name): Likewise.
+
 2018-11-30  John Baldwin  <jhb@FreeBSD.org>
 
 	* break-catch-syscall.c (catch_syscall_split_args): Pass 'result'
diff --git a/gdb/NEWS b/gdb/NEWS
index 9ecbb83d99..6708a61163 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -40,6 +40,19 @@
 
 * The RISC-V target now supports target descriptions.
 
+* System call catchpoints now support system call aliases on FreeBSD.
+  When the ABI of a system call changes in FreeBSD, this is
+  implemented by leaving a compatibility system call using the old ABI
+  at the existing number and allocating a new system call number for
+  the new ABI.  For example, FreeBSD 12 altered the layout of 'struct
+  kevent' used by the 'kevent' system call.  As a result, FreeBSD 12
+  kernels ship with both 'kevent' and 'freebsd11_kevent' system calls.
+  The 'freebsd11_kevent' system call is assigned an alias of 'kevent'
+  so that a system call catchpoint for the 'kevent' system call will
+  catch invocations of both the 'kevent' and 'freebsd11_kevent'
+  binaries.  This ensures that 'kevent' system calls are caught for
+  binaries using either the old or new ABIs.
+
 * New targets
 
   NXP S12Z		s12z-*-elf
diff --git a/gdb/break-catch-syscall.c b/gdb/break-catch-syscall.c
index bad34d6fd8..14158d8004 100644
--- a/gdb/break-catch-syscall.c
+++ b/gdb/break-catch-syscall.c
@@ -419,18 +419,13 @@ catch_syscall_split_args (const char *arg)
 	}
       else
 	{
-	  /* We have a name.  Let's check if it's valid and convert it
-	     to a number.  */
-	  get_syscall_by_name (gdbarch, cur_name, &s);
-
-	  if (s.number == UNKNOWN_SYSCALL)
+	  /* We have a name.  Let's check if it's valid and fetch a
+	     list of matching numbers.  */
+	  if (!get_syscalls_by_name (gdbarch, cur_name, &result))
 	    /* Here we have to issue an error instead of a warning,
 	       because GDB cannot do anything useful if there's no
 	       syscall number to be caught.  */
 	    error (_("Unknown syscall name '%s'."), cur_name);
-
-	  /* Ok, it's valid.  */
-	  result.push_back (s.number);
 	}
     }
 
diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index 59e7330a4d..7e4ee52420 100644
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,3 +1,10 @@
+2018-11-30  John Baldwin  <jhb@FreeBSD.org>
+
+	* gdb.texinfo (Set Catchpoints): Add an anchor for 'catch syscall'.
+	(Native): Add a FreeBSD subsection.
+	(FreeBSD): Document use of system call aliases for compatibility
+	system calls.
+
 2018-11-21  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* gdb.texinfo (Standard Target Features): Add RISC-V Features
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 7350d94573..d766e44e63 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -4560,6 +4560,7 @@ A failed Ada assertion.
 @cindex break on fork/exec
 A call to @code{exec}.
 
+@anchor{catch syscall}
 @item syscall
 @itemx syscall @r{[}@var{name} @r{|} @var{number} @r{|} @r{group:}@var{groupname} @r{|} @r{g:}@var{groupname}@r{]} @dots{}
 @kindex catch syscall
@@ -22357,6 +22358,7 @@ configurations.
 * Cygwin Native::		Features specific to the Cygwin port
 * Hurd Native::                 Features specific to @sc{gnu} Hurd
 * Darwin::			Features specific to Darwin
+* FreeBSD::			Features specific to FreeBSD
 @end menu
 
 @node BSD libkvm Interface
@@ -23242,6 +23244,27 @@ better understand the cause of a fault.  The default is off.
 Show the current state of exceptions trapping.
 @end table
 
+@node FreeBSD
+@subsection FreeBSD
+@cindex FreeBSD
+
+When the ABI of a system call is changed in the FreeBSD kernel, this
+is implemented by leaving a compatibility system call using the old
+ABI at the existing number and allocating a new system call number for
+the version using the new ABI.  As a convenience, when a system call
+is caught by name (@pxref{catch syscall}), compatibility system calls
+are also caught.
+
+For example, FreeBSD 12 introduced a new variant of the @code{kevent}
+system call and catching the @code{kevent} system call by name catches
+both variants:
+
+@smallexample
+(@value{GDBP}) catch syscall kevent
+Catchpoint 1 (syscalls 'freebsd11_kevent' [363] 'kevent' [560])
+(@value{GDBP})
+@end smallexample
+
 
 @node Embedded OS
 @section Embedded Operating Systems
diff --git a/gdb/gdbarch.h b/gdb/gdbarch.h
index 8356e6e7b4..e13c4699a6 100644
--- a/gdb/gdbarch.h
+++ b/gdb/gdbarch.h
@@ -1592,9 +1592,6 @@ typedef ULONGEST (gdbarch_type_align_ftype) (struct gdbarch *gdbarch, struct typ
 extern ULONGEST gdbarch_type_align (struct gdbarch *gdbarch, struct type *type);
 extern void set_gdbarch_type_align (struct gdbarch *gdbarch, gdbarch_type_align_ftype *type_align);
 
-/* Definition for an unknown syscall, used basically in error-cases.  */
-#define UNKNOWN_SYSCALL (-1)
-
 extern struct gdbarch_tdep *gdbarch_tdep (struct gdbarch *gdbarch);
 
 
diff --git a/gdb/gdbarch.sh b/gdb/gdbarch.sh
index ddd93c2717..a876a21555 100755
--- a/gdb/gdbarch.sh
+++ b/gdb/gdbarch.sh
@@ -1416,9 +1416,6 @@ done
 # close it off
 cat <<EOF
 
-/* Definition for an unknown syscall, used basically in error-cases.  */
-#define UNKNOWN_SYSCALL (-1)
-
 extern struct gdbarch_tdep *gdbarch_tdep (struct gdbarch *gdbarch);
 
 
diff --git a/gdb/syscalls/gdb-syscalls.dtd b/gdb/syscalls/gdb-syscalls.dtd
index c2aa478aa4..6aa73f288a 100644
--- a/gdb/syscalls/gdb-syscalls.dtd
+++ b/gdb/syscalls/gdb-syscalls.dtd
@@ -12,4 +12,5 @@
 <!ATTLIST syscall
 	name			CDATA	#REQUIRED
 	number			CDATA	#REQUIRED
+	alias			CDATA	#IMPLIED
 	groups			CDATA	#IMPLIED>
diff --git a/gdb/xml-syscall.c b/gdb/xml-syscall.c
index d1b5bf8a2f..a09ccb99b2 100644
--- a/gdb/xml-syscall.c
+++ b/gdb/xml-syscall.c
@@ -61,13 +61,12 @@ get_syscall_by_number (struct gdbarch *gdbarch,
   s->name = NULL;
 }
 
-void
-get_syscall_by_name (struct gdbarch *gdbarch, const char *syscall_name,
-		     struct syscall *s)
+bool
+get_syscalls_by_name (struct gdbarch *gdbarch, const char *syscall_name,
+		      std::vector<int> *syscall_numbers)
 {
   syscall_warn_user ();
-  s->number = UNKNOWN_SYSCALL;
-  s->name = syscall_name;
+  return false;
 }
 
 const char **
@@ -97,8 +96,8 @@ get_syscall_group_names (struct gdbarch *gdbarch)
 /* Structure which describes a syscall.  */
 struct syscall_desc
 {
-  syscall_desc (int number_, std::string name_)
-  : number (number_), name (name_)
+  syscall_desc (int number_, std::string name_, std::string alias_)
+  : number (number_), name (name_), alias (alias_)
   {}
 
   /* The syscall number.  */
@@ -108,6 +107,10 @@ struct syscall_desc
   /* The syscall name.  */
 
   std::string name;
+
+  /* An optional alias.  */
+
+  std::string alias;
 };
 
 typedef std::unique_ptr<syscall_desc> syscall_desc_up;
@@ -207,10 +210,11 @@ syscall_group_add_syscall (struct syscalls_info *syscalls_info,
 
 static void
 syscall_create_syscall_desc (struct syscalls_info *syscalls_info,
-			     const char *name, int number,
+			     const char *name, int number, const char *alias,
 			     char *groups)
 {
-  syscall_desc *sysdesc = new syscall_desc (number, name);
+  syscall_desc *sysdesc = new syscall_desc (number, name,
+					    alias != NULL ? alias : "");
 
   syscalls_info->syscalls.emplace_back (sysdesc);
 
@@ -235,6 +239,7 @@ syscall_start_syscall (struct gdb_xml_parser *parser,
   /* syscall info.  */
   char *name = NULL;
   int number = 0;
+  char *alias = NULL;
   char *groups = NULL;
 
   for (const gdb_xml_value &attr : attributes)
@@ -243,6 +248,8 @@ syscall_start_syscall (struct gdb_xml_parser *parser,
         name = (char *) attr.value.get ();
       else if (strcmp (attr.name, "number") == 0)
         number = * (ULONGEST *) attr.value.get ();
+      else if (strcmp (attr.name, "alias") == 0)
+        alias = (char *) attr.value.get ();
       else if (strcmp (attr.name, "groups") == 0)
         groups = (char *) attr.value.get ();
       else
@@ -251,7 +258,8 @@ syscall_start_syscall (struct gdb_xml_parser *parser,
     }
 
   gdb_assert (name);
-  syscall_create_syscall_desc (data->syscalls_info, name, number, groups);
+  syscall_create_syscall_desc (data->syscalls_info, name, number, alias,
+			       groups);
 }
 
 
@@ -259,6 +267,7 @@ syscall_start_syscall (struct gdb_xml_parser *parser,
 static const struct gdb_xml_attribute syscall_attr[] = {
   { "number", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
   { "name", GDB_XML_AF_NONE, NULL, NULL },
+  { "alias", GDB_XML_AF_OPTIONAL, NULL, NULL },
   { "groups", GDB_XML_AF_OPTIONAL, NULL, NULL },
   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 };
@@ -390,21 +399,22 @@ syscall_group_get_group_by_name (const struct syscalls_info *syscalls_info,
   return NULL;
 }
 
-static int
-xml_get_syscall_number (struct gdbarch *gdbarch,
-                        const char *syscall_name)
+static bool
+xml_get_syscalls_by_name (struct gdbarch *gdbarch, const char *syscall_name,
+			  std::vector<int> *syscall_numbers)
 {
   struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
 
-  if (syscalls_info == NULL
-      || syscall_name == NULL)
-    return UNKNOWN_SYSCALL;
+  bool found = false;
+  if (syscalls_info != NULL && syscall_name != NULL && syscall_numbers != NULL)
+    for (const syscall_desc_up &sysdesc : syscalls_info->syscalls)
+      if (sysdesc->name == syscall_name || sysdesc->alias == syscall_name)
+	{
+	  syscall_numbers->push_back (sysdesc->number);
+	  found = true;
+	}
 
-  for (const syscall_desc_up &sysdesc : syscalls_info->syscalls)
-    if (sysdesc->name == syscall_name)
-      return sysdesc->number;
-
-  return UNKNOWN_SYSCALL;
+  return found;
 }
 
 static const char *
@@ -510,14 +520,13 @@ get_syscall_by_number (struct gdbarch *gdbarch,
   s->name = xml_get_syscall_name (gdbarch, syscall_number);
 }
 
-void
-get_syscall_by_name (struct gdbarch *gdbarch,
-		     const char *syscall_name, struct syscall *s)
+bool
+get_syscalls_by_name (struct gdbarch *gdbarch, const char *syscall_name,
+		      std::vector<int> *syscall_numbers)
 {
   init_syscalls_info (gdbarch);
 
-  s->number = xml_get_syscall_number (gdbarch, syscall_name);
-  s->name = syscall_name;
+  return xml_get_syscalls_by_name (gdbarch, syscall_name, syscall_numbers);
 }
 
 const char **
diff --git a/gdb/xml-syscall.h b/gdb/xml-syscall.h
index 012a4b75a4..31a13e231d 100644
--- a/gdb/xml-syscall.h
+++ b/gdb/xml-syscall.h
@@ -38,11 +38,13 @@ void set_xml_syscall_file_name (struct gdbarch *gdbarch,
 void get_syscall_by_number (struct gdbarch *gdbarch,
 			    int syscall_number, struct syscall *s);
 
-/* Function that retrieves the syscall number corresponding to the given
-   name.  It puts the requested information inside 'struct syscall'.  */
+/* Function that retrieves the syscall numbers corresponding to the
+   given name.  The numbers of all syscalls with either a name or
+   alias equal to SYSCALL_NAME are appended to SYSCALL_NUMBERS.  If no
+   matching syscalls are found, return false.  */
 
-void get_syscall_by_name (struct gdbarch *gdbarch,
-			  const char *syscall_name, struct syscall *s);
+bool get_syscalls_by_name (struct gdbarch *gdbarch, const char *syscall_name,
+			   std::vector<int> *syscall_numbers);
 
 /* Function used to retrieve the list of syscalls in the system.  This list
    is returned as an array of strings.  Returns the list of syscalls in the
-- 
2.19.2

[PATCH v4 1/3] Change get_syscalls_by_group to append to an existing vector of integers.

[John Baldwin]

This removes the need for the caller to explicitly manage the memory
for the returned system call list.  The sole caller only needed the
system call numbers rather than the full syscall structures.

get_syscalls_by_group now uses a boolean return value to indicate if
the requested group exists.

gdb/ChangeLog:

	* break-catch-syscall.c (catch_syscall_split_args): Pass 'result'
	to get_syscalls_by_group.
	* xml-syscall.c [!HAVE_LIBEXPAT] (get_syscalls_by_group): Return
	false.
	[HAVE_LIBEXPAT] (xml_list_syscalls_by_group): Append syscall
	numbers to an existing vector of integers and return a bool.
	(get_syscalls_by_group): Accept pointer to vector of integers
	and change return type to bool.
	* xml-syscall.h (get_syscalls_by_group): Likewise.
---
 gdb/ChangeLog             | 12 ++++++++++
 gdb/break-catch-syscall.c | 14 +----------
 gdb/xml-syscall.c         | 49 +++++++++++++++------------------------
 gdb/xml-syscall.h         | 10 ++++----
 4 files changed, 36 insertions(+), 49 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 348eb65ec7..9f2d1ccd5e 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,15 @@
+2018-11-30  John Baldwin  <jhb@FreeBSD.org>
+
+	* break-catch-syscall.c (catch_syscall_split_args): Pass 'result'
+	to get_syscalls_by_group.
+	* xml-syscall.c [!HAVE_LIBEXPAT] (get_syscalls_by_group): Return
+	false.
+	[HAVE_LIBEXPAT] (xml_list_syscalls_by_group): Append syscall
+	numbers to an existing vector of integers and return a bool.
+	(get_syscalls_by_group): Accept pointer to vector of integers
+	and change return type to bool.
+	* xml-syscall.h (get_syscalls_by_group): Likewise.
+
 2018-11-30  John Baldwin  <jhb@FreeBSD.org>
 
 	* fbsd-nat.c [__FreeBSD_version >= 700009] (USE_SIGINFO): Macro
diff --git a/gdb/break-catch-syscall.c b/gdb/break-catch-syscall.c
index 93ef74c249..bad34d6fd8 100644
--- a/gdb/break-catch-syscall.c
+++ b/gdb/break-catch-syscall.c
@@ -409,25 +409,13 @@ catch_syscall_split_args (const char *arg)
 	{
 	  /* We have a syscall group.  Let's expand it into a syscall
 	     list before inserting.  */
-	  struct syscall *syscall_list;
 	  const char *group_name;
 
 	  /* Skip over "g:" and "group:" prefix strings.  */
 	  group_name = strchr (cur_name, ':') + 1;
 
-	  syscall_list = get_syscalls_by_group (gdbarch, group_name);
-
-	  if (syscall_list == NULL)
+	  if (!get_syscalls_by_group (gdbarch, group_name, &result))
 	    error (_("Unknown syscall group '%s'."), group_name);
-
-	  for (i = 0; syscall_list[i].name != NULL; i++)
-	    {
-	      /* Insert each syscall that are part of the group.  No
-		 need to check if it is valid.  */
-	      result.push_back (syscall_list[i].number);
-	    }
-
-	  xfree (syscall_list);
 	}
       else
 	{
diff --git a/gdb/xml-syscall.c b/gdb/xml-syscall.c
index bf17642911..d1b5bf8a2f 100644
--- a/gdb/xml-syscall.c
+++ b/gdb/xml-syscall.c
@@ -77,11 +77,12 @@ get_syscall_names (struct gdbarch *gdbarch)
   return NULL;
 }
 
-struct syscall *
-get_syscalls_by_group (struct gdbarch *gdbarch, const char *group)
+bool
+get_syscalls_by_group (struct gdbarch *gdbarch, const char *group,
+		       std::vector<int> *syscall_numbers)
 {
   syscall_warn_user ();
-  return NULL;
+  return false;
 }
 
 const char **
@@ -444,40 +445,27 @@ xml_list_of_syscalls (struct gdbarch *gdbarch)
 }
 
 /* Iterate over the syscall_group_desc element to return a list of
-   syscalls that are part of the given group, terminated by an empty
-   element.  If the syscall group doesn't exist, return NULL.  */
+   syscalls that are part of the given group.  If the syscall group
+   doesn't exist, return false.  */
 
-static struct syscall *
-xml_list_syscalls_by_group (struct gdbarch *gdbarch, const char *group)
+static bool
+xml_list_syscalls_by_group (struct gdbarch *gdbarch, const char *group,
+			    std::vector<int> *syscalls)
 {
   struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
   struct syscall_group_desc *groupdesc;
-  struct syscall *syscalls = NULL;
-  int nsyscalls;
-  int i;
 
-  if (syscalls_info == NULL)
-    return NULL;
+  if (syscalls_info == NULL || syscalls == NULL)
+    return false;
 
   groupdesc = syscall_group_get_group_by_name (syscalls_info, group);
   if (groupdesc == NULL)
-    return NULL;
+    return false;
 
-  nsyscalls = groupdesc->syscalls.size ();
-  syscalls = (struct syscall*) xmalloc ((nsyscalls + 1)
-					* sizeof (struct syscall));
+  for (const struct syscall_desc *sysdesc : groupdesc->syscalls)
+    syscalls->push_back (sysdesc->number);
 
-  for (i = 0; i < groupdesc->syscalls.size (); i++)
-    {
-      syscalls[i].name = groupdesc->syscalls[i]->name.c_str ();
-      syscalls[i].number = groupdesc->syscalls[i]->number;
-    }
-
-  /* Add final element marker.  */
-  syscalls[i].name = NULL;
-  syscalls[i].number = 0;
-
-  return syscalls;
+  return true;
 }
 
 /* Return a NULL terminated list of syscall groups or an empty list, if
@@ -542,12 +530,13 @@ get_syscall_names (struct gdbarch *gdbarch)
 
 /* See comment in xml-syscall.h.  */
 
-struct syscall *
-get_syscalls_by_group (struct gdbarch *gdbarch, const char *group)
+bool
+get_syscalls_by_group (struct gdbarch *gdbarch, const char *group,
+		       std::vector<int> *syscall_numbers)
 {
   init_syscalls_info (gdbarch);
 
-  return xml_list_syscalls_by_group (gdbarch, group);
+  return xml_list_syscalls_by_group (gdbarch, group, syscall_numbers);
 }
 
 /* See comment in xml-syscall.h.  */
diff --git a/gdb/xml-syscall.h b/gdb/xml-syscall.h
index 4429d66400..012a4b75a4 100644
--- a/gdb/xml-syscall.h
+++ b/gdb/xml-syscall.h
@@ -51,13 +51,11 @@ void get_syscall_by_name (struct gdbarch *gdbarch,
 const char **get_syscall_names (struct gdbarch *gdbarch);
 
 /* Function used to retrieve the list of syscalls of a given group in
-   the system.  Return a list of syscalls that are element of the
-   group, terminated by an empty element. The list is malloc'ed
-   and must be freed by the caller.  If group doesn't exist, return
-   NULL.  */
+   the system.  The syscall numbers are appended to SYSCALL_NUMBERS.
+   If the group doesn't exist, return false.  */
 
-struct syscall *get_syscalls_by_group (struct gdbarch *gdbarch,
-				       const char *group);
+bool get_syscalls_by_group (struct gdbarch *gdbarch, const char *group,
+			    std::vector<int> *syscall_numbers);
 
 /* Function used to retrieve the list of syscall groups in the system.
    Return an array of strings terminated by a NULL element.  The list
-- 
2.19.2

[PATCH v4 3/3] Update the FreeBSD system call table to match FreeBSD 12.0.

[John Baldwin]

Add a script to generate the FreeBSD XML system call table from the
sys/sys/syscall.h file in the kernel source tree.  For ABI
compatiblity system calls used by older binaries (such as
freebsd11_kevent()), the original system call name is used as an
alias.

Run this script against the current syscall.h file in FreeBSD's head
branch which is expected to be the file used in 12.0 (head is
currently in code freeze as part of the 12.0 release process).

gdb/ChangeLog:

	* syscalls/update-freebsd.sh: New file.
	* syscalls/freebsd.xml: Regenerate.
---
 gdb/ChangeLog                  |   5 ++
 gdb/syscalls/freebsd.xml       | 110 ++++++++++++++++++++++++++-------
 gdb/syscalls/update-freebsd.sh |  78 +++++++++++++++++++++++
 3 files changed, 170 insertions(+), 23 deletions(-)
 create mode 100755 gdb/syscalls/update-freebsd.sh

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 8da416e0cd..6e3b726391 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2018-11-30  John Baldwin  <jhb@FreeBSD.org>
+
+	* syscalls/update-freebsd.sh: New file.
+	* syscalls/freebsd.xml: Regenerate.
+
 2018-11-30  John Baldwin  <jhb@FreeBSD.org>
 
 	* NEWS: Add entry documenting system call aliases.
diff --git a/gdb/syscalls/freebsd.xml b/gdb/syscalls/freebsd.xml
index 810258a850..418a1ea838 100644
--- a/gdb/syscalls/freebsd.xml
+++ b/gdb/syscalls/freebsd.xml
@@ -1,4 +1,5 @@
-<?xml version="1.0"?>
+<?xml version="1.0"?> <!-- THIS FILE IS GENERATED -*- buffer-read-only: t -*-  -->
+<!-- vi:set ro: -->
 <!-- Copyright (C) 2009-2018 Free Software Foundation, Inc.
 
      Copying and distribution of this file, with or without modification,
@@ -24,12 +25,14 @@
   <syscall name="wait4" number="7"/>
   <syscall name="link" number="9"/>
   <syscall name="unlink" number="10"/>
+  <syscall name="execv" number="11"/>
   <syscall name="chdir" number="12"/>
   <syscall name="fchdir" number="13"/>
-  <syscall name="mknod" number="14"/>
+  <syscall name="freebsd11_mknod" number="14" alias="mknod"/>
   <syscall name="chmod" number="15"/>
   <syscall name="chown" number="16"/>
   <syscall name="break" number="17"/>
+  <syscall name="freebsd4_getfsstat" number="18" alias="getfsstat"/>
   <syscall name="getpid" number="20"/>
   <syscall name="mount" number="21"/>
   <syscall name="unmount" number="22"/>
@@ -50,7 +53,7 @@
   <syscall name="kill" number="37"/>
   <syscall name="getppid" number="39"/>
   <syscall name="dup" number="41"/>
-  <syscall name="pipe" number="42"/>
+  <syscall name="freebsd10_pipe" number="42" alias="pipe"/>
   <syscall name="getegid" number="43"/>
   <syscall name="profil" number="44"/>
   <syscall name="ktrace" number="45"/>
@@ -69,12 +72,16 @@
   <syscall name="chroot" number="61"/>
   <syscall name="msync" number="65"/>
   <syscall name="vfork" number="66"/>
+  <syscall name="vread" number="67"/>
+  <syscall name="vwrite" number="68"/>
   <syscall name="sbrk" number="69"/>
   <syscall name="sstk" number="70"/>
-  <syscall name="vadvise" number="72"/>
+  <syscall name="freebsd11_vadvise" number="72" alias="vadvise"/>
   <syscall name="munmap" number="73"/>
   <syscall name="mprotect" number="74"/>
   <syscall name="madvise" number="75"/>
+  <syscall name="vhangup" number="76"/>
+  <syscall name="vlimit" number="77"/>
   <syscall name="mincore" number="78"/>
   <syscall name="getgroups" number="79"/>
   <syscall name="setgroups" number="80"/>
@@ -95,6 +102,8 @@
   <syscall name="bind" number="104"/>
   <syscall name="setsockopt" number="105"/>
   <syscall name="listen" number="106"/>
+  <syscall name="vtimes" number="107"/>
+  <syscall name="vtrace" number="115"/>
   <syscall name="gettimeofday" number="116"/>
   <syscall name="getrusage" number="117"/>
   <syscall name="getsockopt" number="118"/>
@@ -119,27 +128,42 @@
   <syscall name="quotactl" number="148"/>
   <syscall name="nlm_syscall" number="154"/>
   <syscall name="nfssvc" number="155"/>
+  <syscall name="freebsd4_statfs" number="157" alias="statfs"/>
+  <syscall name="freebsd4_fstatfs" number="158" alias="fstatfs"/>
   <syscall name="lgetfh" number="160"/>
   <syscall name="getfh" number="161"/>
+  <syscall name="freebsd4_getdomainname" number="162" alias="getdomainname"/>
+  <syscall name="freebsd4_setdomainname" number="163" alias="setdomainname"/>
+  <syscall name="freebsd4_uname" number="164" alias="uname"/>
   <syscall name="sysarch" number="165"/>
   <syscall name="rtprio" number="166"/>
   <syscall name="semsys" number="169"/>
   <syscall name="msgsys" number="170"/>
   <syscall name="shmsys" number="171"/>
+  <syscall name="freebsd6_pread" number="173" alias="pread"/>
+  <syscall name="freebsd6_pwrite" number="174" alias="pwrite"/>
   <syscall name="setfib" number="175"/>
   <syscall name="ntp_adjtime" number="176"/>
   <syscall name="setgid" number="181"/>
   <syscall name="setegid" number="182"/>
   <syscall name="seteuid" number="183"/>
-  <syscall name="stat" number="188"/>
-  <syscall name="fstat" number="189"/>
-  <syscall name="lstat" number="190"/>
+  <syscall name="lfs_bmapv" number="184"/>
+  <syscall name="lfs_markv" number="185"/>
+  <syscall name="lfs_segclean" number="186"/>
+  <syscall name="lfs_segwait" number="187"/>
+  <syscall name="freebsd11_stat" number="188" alias="stat"/>
+  <syscall name="freebsd11_fstat" number="189" alias="fstat"/>
+  <syscall name="freebsd11_lstat" number="190" alias="lstat"/>
   <syscall name="pathconf" number="191"/>
   <syscall name="fpathconf" number="192"/>
   <syscall name="getrlimit" number="194"/>
   <syscall name="setrlimit" number="195"/>
-  <syscall name="getdirentries" number="196"/>
+  <syscall name="freebsd11_getdirentries" number="196" alias="getdirentries"/>
+  <syscall name="freebsd6_mmap" number="197" alias="mmap"/>
   <syscall name="__syscall" number="198"/>
+  <syscall name="freebsd6_lseek" number="199" alias="lseek"/>
+  <syscall name="freebsd6_truncate" number="200" alias="truncate"/>
+  <syscall name="freebsd6_ftruncate" number="201" alias="ftruncate"/>
   <syscall name="__sysctl" number="202"/>
   <syscall name="mlock" number="203"/>
   <syscall name="munlock" number="204"/>
@@ -147,15 +171,16 @@
   <syscall name="futimes" number="206"/>
   <syscall name="getpgid" number="207"/>
   <syscall name="poll" number="209"/>
-  <syscall name="freebsd7___semctl" number="220"/>
+  <syscall name="freebsd7___semctl" number="220" alias="__semctl"/>
   <syscall name="semget" number="221"/>
   <syscall name="semop" number="222"/>
-  <syscall name="freebsd7_msgctl" number="224"/>
+  <syscall name="semconfig" number="223"/>
+  <syscall name="freebsd7_msgctl" number="224" alias="msgctl"/>
   <syscall name="msgget" number="225"/>
   <syscall name="msgsnd" number="226"/>
   <syscall name="msgrcv" number="227"/>
   <syscall name="shmat" number="228"/>
-  <syscall name="freebsd7_shmctl" number="229"/>
+  <syscall name="freebsd7_shmctl" number="229" alias="shmctl"/>
   <syscall name="shmdt" number="230"/>
   <syscall name="shmget" number="231"/>
   <syscall name="clock_gettime" number="232"/>
@@ -170,6 +195,7 @@
   <syscall name="ffclock_getcounter" number="241"/>
   <syscall name="ffclock_setestimate" number="242"/>
   <syscall name="ffclock_getestimate" number="243"/>
+  <syscall name="clock_nanosleep" number="244"/>
   <syscall name="clock_getcpuclockid2" number="247"/>
   <syscall name="ntp_gettime" number="248"/>
   <syscall name="minherit" number="250"/>
@@ -180,18 +206,19 @@
   <syscall name="aio_read" number="255"/>
   <syscall name="aio_write" number="256"/>
   <syscall name="lio_listio" number="257"/>
-  <syscall name="getdents" number="272"/>
+  <syscall name="freebsd11_getdents" number="272" alias="getdents"/>
   <syscall name="lchmod" number="274"/>
   <syscall name="netbsd_lchown" number="275"/>
   <syscall name="lutimes" number="276"/>
   <syscall name="netbsd_msync" number="277"/>
-  <syscall name="nstat" number="278"/>
-  <syscall name="nfstat" number="279"/>
-  <syscall name="nlstat" number="280"/>
+  <syscall name="freebsd11_nstat" number="278" alias="nstat"/>
+  <syscall name="freebsd11_nfstat" number="279" alias="nfstat"/>
+  <syscall name="freebsd11_nlstat" number="280" alias="nlstat"/>
   <syscall name="preadv" number="289"/>
   <syscall name="pwritev" number="290"/>
+  <syscall name="freebsd4_fhstatfs" number="297" alias="fhstatfs"/>
   <syscall name="fhopen" number="298"/>
-  <syscall name="fhstat" number="299"/>
+  <syscall name="freebsd11_fhstat" number="299" alias="fhstat"/>
   <syscall name="modnext" number="300"/>
   <syscall name="modstat" number="301"/>
   <syscall name="modfnext" number="302"/>
@@ -205,11 +232,17 @@
   <syscall name="getsid" number="310"/>
   <syscall name="setresuid" number="311"/>
   <syscall name="setresgid" number="312"/>
+  <syscall name="signanosleep" number="313"/>
   <syscall name="aio_return" number="314"/>
   <syscall name="aio_suspend" number="315"/>
   <syscall name="aio_cancel" number="316"/>
   <syscall name="aio_error" number="317"/>
+  <syscall name="freebsd6_aio_read" number="318" alias="aio_read"/>
+  <syscall name="freebsd6_aio_write" number="319" alias="aio_write"/>
+  <syscall name="freebsd6_lio_listio" number="320" alias="lio_listio"/>
   <syscall name="yield" number="321"/>
+  <syscall name="thr_sleep" number="322"/>
+  <syscall name="thr_wakeup" number="323"/>
   <syscall name="mlockall" number="324"/>
   <syscall name="munlockall" number="325"/>
   <syscall name="__getcwd" number="326"/>
@@ -222,12 +255,15 @@
   <syscall name="sched_get_priority_min" number="333"/>
   <syscall name="sched_rr_get_interval" number="334"/>
   <syscall name="utrace" number="335"/>
+  <syscall name="freebsd4_sendfile" number="336" alias="sendfile"/>
   <syscall name="kldsym" number="337"/>
   <syscall name="jail" number="338"/>
   <syscall name="nnpfs_syscall" number="339"/>
   <syscall name="sigprocmask" number="340"/>
   <syscall name="sigsuspend" number="341"/>
+  <syscall name="freebsd4_sigaction" number="342" alias="sigaction"/>
   <syscall name="sigpending" number="343"/>
+  <syscall name="freebsd4_sigreturn" number="344" alias="sigreturn"/>
   <syscall name="sigtimedwait" number="345"/>
   <syscall name="sigwaitinfo" number="346"/>
   <syscall name="__acl_get_file" number="347"/>
@@ -246,14 +282,26 @@
   <syscall name="getresuid" number="360"/>
   <syscall name="getresgid" number="361"/>
   <syscall name="kqueue" number="362"/>
-  <syscall name="kevent" number="363"/>
+  <syscall name="freebsd11_kevent" number="363" alias="kevent"/>
+  <syscall name="__cap_get_proc" number="364"/>
+  <syscall name="__cap_set_proc" number="365"/>
+  <syscall name="__cap_get_fd" number="366"/>
+  <syscall name="__cap_get_file" number="367"/>
+  <syscall name="__cap_set_fd" number="368"/>
+  <syscall name="__cap_set_file" number="369"/>
   <syscall name="extattr_set_fd" number="371"/>
   <syscall name="extattr_get_fd" number="372"/>
   <syscall name="extattr_delete_fd" number="373"/>
   <syscall name="__setugid" number="374"/>
+  <syscall name="nfsclnt" number="375"/>
   <syscall name="eaccess" number="376"/>
   <syscall name="afs3_syscall" number="377"/>
   <syscall name="nmount" number="378"/>
+  <syscall name="kse_exit" number="379"/>
+  <syscall name="kse_wakeup" number="380"/>
+  <syscall name="kse_create" number="381"/>
+  <syscall name="kse_thr_interrupt" number="382"/>
+  <syscall name="kse_release" number="383"/>
   <syscall name="__mac_get_proc" number="384"/>
   <syscall name="__mac_set_proc" number="385"/>
   <syscall name="__mac_get_fd" number="386"/>
@@ -265,10 +313,10 @@
   <syscall name="uuidgen" number="392"/>
   <syscall name="sendfile" number="393"/>
   <syscall name="mac_syscall" number="394"/>
-  <syscall name="getfsstat" number="395"/>
-  <syscall name="statfs" number="396"/>
-  <syscall name="fstatfs" number="397"/>
-  <syscall name="fhstatfs" number="398"/>
+  <syscall name="freebsd11_getfsstat" number="395" alias="getfsstat"/>
+  <syscall name="freebsd11_statfs" number="396" alias="statfs"/>
+  <syscall name="freebsd11_fstatfs" number="397" alias="fstatfs"/>
+  <syscall name="freebsd11_fhstatfs" number="398" alias="fhstatfs"/>
   <syscall name="ksem_close" number="400"/>
   <syscall name="ksem_post" number="401"/>
   <syscall name="ksem_wait" number="402"/>
@@ -304,6 +352,7 @@
   <syscall name="extattr_list_fd" number="437"/>
   <syscall name="extattr_list_file" number="438"/>
   <syscall name="extattr_list_link" number="439"/>
+  <syscall name="kse_switchin" number="440"/>
   <syscall name="ksem_timedwait" number="441"/>
   <syscall name="thr_suspend" number="442"/>
   <syscall name="thr_wake" number="443"/>
@@ -352,12 +401,12 @@
   <syscall name="fchmodat" number="490"/>
   <syscall name="fchownat" number="491"/>
   <syscall name="fexecve" number="492"/>
-  <syscall name="fstatat" number="493"/>
+  <syscall name="freebsd11_fstatat" number="493" alias="fstatat"/>
   <syscall name="futimesat" number="494"/>
   <syscall name="linkat" number="495"/>
   <syscall name="mkdirat" number="496"/>
   <syscall name="mkfifoat" number="497"/>
-  <syscall name="mknodat" number="498"/>
+  <syscall name="freebsd11_mknodat" number="498" alias="mknodat"/>
   <syscall name="openat" number="499"/>
   <syscall name="readlinkat" number="500"/>
   <syscall name="renameat" number="501"/>
@@ -373,6 +422,7 @@
   <syscall name="msgctl" number="511"/>
   <syscall name="shmctl" number="512"/>
   <syscall name="lpathconf" number="513"/>
+  <syscall name="cap_new" number="514"/>
   <syscall name="__cap_rights_get" number="515"/>
   <syscall name="cap_enter" number="516"/>
   <syscall name="cap_getmode" number="517"/>
@@ -407,4 +457,18 @@
   <syscall name="utimensat" number="547"/>
   <syscall name="numa_getaffinity" number="548"/>
   <syscall name="numa_setaffinity" number="549"/>
+  <syscall name="fdatasync" number="550"/>
+  <syscall name="fstat" number="551"/>
+  <syscall name="fstatat" number="552"/>
+  <syscall name="fhstat" number="553"/>
+  <syscall name="getdirentries" number="554"/>
+  <syscall name="statfs" number="555"/>
+  <syscall name="fstatfs" number="556"/>
+  <syscall name="getfsstat" number="557"/>
+  <syscall name="fhstatfs" number="558"/>
+  <syscall name="mknodat" number="559"/>
+  <syscall name="kevent" number="560"/>
+  <syscall name="cpuset_getdomain" number="561"/>
+  <syscall name="cpuset_setdomain" number="562"/>
+  <syscall name="getrandom" number="563"/>
 </syscalls_info>
diff --git a/gdb/syscalls/update-freebsd.sh b/gdb/syscalls/update-freebsd.sh
new file mode 100755
index 0000000000..d109367042
--- /dev/null
+++ b/gdb/syscalls/update-freebsd.sh
@@ -0,0 +1,78 @@
+#! /bin/sh
+
+# Copyright (C) 2018 Free Software Foundation, Inc.
+#
+# This file is part of GDB.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Usage: update-freebsd.sh <path-to-syscall.h>
+# Update the freebsd.xml file.
+#
+# FreeBSD uses the same list of system calls on all architectures.
+# The list is defined in the sys/kern/syscalls.master file in the
+# FreeBSD source tree.  This file is used as an input to generate
+# several files that are also stored in FreeBSD's source tree.  This
+# script parses one of those generated files (sys/sys/syscall.h)
+# rather than syscalls.master as syscall.h is easier to parse.
+
+if [ $# -ne 1 ]; then
+   echo "Error: Path to syscall.h missing. Aborting."
+   echo "Usage: update-gnulib.sh <path-to-syscall.h>"
+   exit 1
+fi
+
+cat > freebsd.xml.tmp <<EOF
+<?xml version="1.0"?> <!-- THIS FILE IS GENERATED -*- buffer-read-only: t -*-  -->
+<!-- vi:set ro: -->
+<!-- Copyright (C) 2009-2018 Free Software Foundation, Inc.
+
+     Copying and distribution of this file, with or without modification,
+     are permitted in any medium without royalty provided the copyright
+     notice and this notice are preserved.  -->
+
+<!DOCTYPE feature SYSTEM "gdb-syscalls.dtd">
+
+<!-- This file was generated using the following file:
+
+     /usr/src/sys/sys/syscall.h
+
+     The file mentioned above belongs to the FreeBSD Kernel.  -->
+
+<syscalls_info>
+EOF
+
+awk '
+/MAXSYSCALL/ {
+    next
+}
+/^#define/ {
+    sub(/^SYS_/,"",$2);
+    printf "  <syscall name=\"%s\" number=\"%s\"", $2, $3
+    if (sub(/^freebsd[0-9]*_/,"",$2) != 0)
+        printf " alias=\"%s\"", $2
+    printf "/>\n"
+}
+/\/\* [0-9]* is obsolete [a-z_]* \*\// {
+    printf "  <syscall name=\"%s\" number=\"%s\"/>\n", $5, $2
+}
+/\/\* [0-9]* is freebsd[0-9]* [a-z_]* \*\// {
+    printf "  <syscall name=\"%s_%s\" number=\"%s\" alias=\"%s\"/>\n", $4, $5, $2, $5
+}' $1 >> freebsd.xml.tmp
+
+cat >> freebsd.xml.tmp <<EOF
+</syscalls_info>
+EOF
+
+../../move-if-change freebsd.xml.tmp freebsd.xml
-- 
2.19.2

Re: [PATCH v4 2/3] Add an optional "alias" attribute to syscall entries.

[Eli Zaretskii]

> From: John Baldwin <jhb@FreeBSD.org>
> Date: Fri, 30 Nov 2018 14:20:12 -0800
> 
> gdb/ChangeLog:
> 
> 	* NEWS: Add entry documenting system call aliases.
> 	* break-catch-syscall.c (catch_syscall_split_args): Pass 'result'
> 	to get_syscalls_by_name.
> 	* gdbarch.sh (UNKNOWN_SYSCALL): Remove.
> 	* gdbarch.h: Regenerate.
> 	* syscalls/gdb-syscalls.dtd (syscall): Add alias attribute.
> 	* xml-syscall.c [!HAVE_LIBEXPAT] (get_syscalls_by_name): Rename
> 	from get_syscall_by_name.  Now accepts a pointer to a vector of
> 	integers and returns a bool.
> 	[HAVE_LIBEXPAT] (struct syscall_desc): Add alias member.
> 	(syscall_create_syscall_desc): Add alias parameter and pass it to
> 	syscall_desc constructor.
> 	(syscall_start_syscall): Handle alias attribute.
> 	(syscall_attr): Add alias attribute.
> 	(xml_get_syscalls_by_name): Rename from xml_get_syscall_number.
> 	Now accepts a pointer to a vector of integers and returns a
> 	bool.  Add syscalls whose alias or name matches the requested
> 	name.
> 	(get_syscalls_by_name): Rename from get_syscall_by_name.  Now
> 	accepts a pointer to a vector of integers and returns a bool.
> 	* xml-syscall.h (get_syscalls_by_name): Likewise.
> 
> gdb/doc/ChangeLog:
> 
> 	* gdb.texinfo (Set Catchpoints): Add an anchor for 'catch syscall'.
> 	(Native): Add a FreeBSD subsection.
> 	(FreeBSD): Document use of system call aliases for compatibility
> 	system calls.

OK for the documentation parts.

Re: [PATCH v4 0/3] Update FreeBSD's syscall table

[Pedro Alves]

On 11/30/2018 10:20 PM, John Baldwin wrote:
> Relative to V4, this passes the vector of integerers via pointers
> rather than non-const references.  It also adds a some documentation
> to the manual.
> 
> John Baldwin (3):
>   Change get_syscalls_by_group to append to an existing vector of
>     integers.
>   Add an optional "alias" attribute to syscall entries.
>   Update the FreeBSD system call table to match FreeBSD 12.0.

LGTM.

Thanks,
Pedro Alves