* procfs.c (procfs_wait): handle syscall events first.

* procfs.c (GDB_GREGSET_TYPE, GDB_FPREGSET_TYPE): new macros.
        * config/sparc/xm-sun4sol2.h: use them.
        * core-sol2.c: don't #undef gregset_t and fpregset_t.
        * sol-thread.c: ditto.
        * sparc-tdep.c: ditto.

gdb/ChangeLog

@@ -1,3 +1,13 @@
+1998-11-24  Felix Lee  <flee@cygnus.com>
+
+	* procfs.c (procfs_wait): handle syscall events first.
+	
+	* procfs.c (GDB_GREGSET_TYPE, GDB_FPREGSET_TYPE): new macros.
+	* config/sparc/xm-sun4sol2.h: use them.
+	* core-sol2.c: don't #undef gregset_t and fpregset_t.
+	* sol-thread.c: ditto.
+	* sparc-tdep.c: ditto.
+	
 Tue Nov 24 14:13:10 1998  Andrew Cagney  <cagney@chook>
 
 	* breakpoint.c (memory_breakpoint_size): Delete global.

gdb/config/sparc/xm-sun4sol2.h

@@ -25,11 +25,12 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 
 #include "xm-sysv4.h"
 
-/* SVR4's can't seem to agree on what to call the type that contains the
-   general registers.  Kludge around it with a #define.  */
+/* gdb wants to use the prgregset_t interface rather than
+   the gregset_t interface, partly because that's what's
+   used in core-sol2.c */
 
-#define	gregset_t	prgregset_t
-#define	fpregset_t	prfpregset_t
+#define GDB_GREGSET_TYPE prgregset_t
+#define GDB_FPREGSET_TYPE prfpregset_t
 
 /* These are not currently used in SVR4 (but should be, FIXME!).  */
 #undef	DO_DEFERRED_STORES

gdb/core-sol2.c

@@ -26,9 +26,6 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
    and sparc-nat.c to be able to read both flavours.  */
 
 #include "defs.h"
-#undef gregset_t
-#undef fpregset_t
-
 #include <time.h>
 #include <sys/types.h>
 #include <sys/regset.h>

gdb/merge-syscalls.sh

@@ -0,0 +1,114 @@
+#!/bin/sh
+
+# Copyright 1998 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 2 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, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+################
+# Usage: merge-syscalls syscall.tab [HEADER-FILE ...]
+#
+# This will scan every HEADER-FILE
+# (default is /usr/include/sys/syscall.h)
+# for #define SYS_xxx directives,
+# recursively scanning #included files.
+#
+# Then it updates "syscall.tab", which is a file that has a
+# C fragment to initialize a table of known syscall names.
+# Any syscalls already in "syscall.tab" will be kept.
+#
+# In principle, you don't need to run this unless you're
+# porting gdb to a new host that uses procfs.c.
+#
+# FIXME: perhaps use gcc -E -dM instead.
+# FIXME: perhaps track which hosts have which syscalls.
+
+DEST=$1; shift
+
+WS=`printf "[\t ]*" 2>/dev/null || echo '[	 ]*'`
+
+
+scan_all () {
+    for file
+    do
+	scan_one $file
+    done
+}
+
+scan_one () {
+    echo >&2 "scanning $1..."
+    <$1 sed -n -e "
+	/^#${WS}define${WS}SYS_[_a-zA-Z0-9]${WS}/ {
+	    s/^${WS}#${WS}define${WS}\(SYS_[_a-zA-Z0-9]*\)${WS}.*/\1/
+	    p
+	}
+	/${WS}syscall_table${WS}\[SYS_[_a-zA-Z0-9]*\]/ {
+	    s/^.*${WS}syscall_table${WS}\[\(SYS_[_a-zA-Z0-9]*\)\].*/\1/
+	    p
+	}
+    " $1 &&
+
+    includes=`
+	<$1 sed -n -e "
+	    /^${WS}#${WS}include${WS}</{
+		s/^${WS}#${WS}include${WS}<\([^>]*\)>.*/\1/
+		p
+	    }
+	" |
+	while read inc; do
+	    for dir in /usr/include; do
+		if [ -f "$dir/$inc" ]; then
+		    echo $dir/$inc
+		fi
+	    done
+	done
+    ` &&
+
+    scan_all $includes
+}
+
+case $# in
+0)
+    set -- /usr/include/sys/syscall.h
+    ;;
+esac
+
+scan_all $DEST "$@" |
+sort -u |
+(
+    echo "/* This file is semi-automatically updated by `basename $0` */"
+    while read sys; do
+	tail=`echo "$sys" | sed 's/^SYS_//'`
+	echo "#if defined ($sys)"
+	echo "  syscall_table[$sys] = "\""$tail"\"";"
+	echo "#endif"
+    done
+) > tmp$$ || exit 1
+
+if cmp -s $DEST tmp$$; then
+   echo "$DEST unchanged"
+   rm -f tmp$$
+
+else
+    echo "creating new $DEST..."
+    if [ -f $DEST ]; then
+       mv $DEST $DEST.orig || exit 1
+       echo " (original moved to $DEST.orig)"
+    fi
+    mv tmp$$ $DEST
+fi
+
+

gdb/procfs.c

@@ -116,6 +116,25 @@ regardless of whether or not the actual target has floating point hardware.
 #  endif
 #endif /* HAVE_MULTIPLE_PROC_FDS */
 
+
+/* These #ifdefs are for sol2.x in particular.  sol2.x has
+   both a "gregset_t" and a "prgregset_t", which have
+   similar uses but different layouts.  sol2.x gdb tries to
+   use prgregset_t (and prfpregset_t) everywhere. */
+
+#ifdef GDB_GREGSET_TYPE
+  typedef GDB_GREGSET_TYPE gdb_gregset_t;
+#else
+  typedef gregset_t gdb_gregset_t;
+#endif
+
+#ifdef GDB_FPREGSET_TYPE
+  typedef GDB_FPREGSET_TYPE gdb_fpregset_t;
+#else
+  typedef fpregset_t gdb_fpregset_t;
+#endif
+
+
 #define MAX_PROC_NAME_SIZE sizeof("/proc/1234567890/status")
 
 extern struct target_ops procfs_ops;		/* Forward declaration */
@@ -149,13 +168,13 @@ struct proc_ctl {
 /* set general registers */
 struct greg_ctl {
         int             cmd;
-        gregset_t       gregset;
+        gdb_gregset_t	gregset;
 };
 
 /* set fp registers */
 struct fpreg_ctl {
         int             cmd;
-        fpregset_t      fpregset;
+        gdb_fpregset_t	fpregset;
 };
 
 /* set signals to be traced */
@@ -221,6 +240,8 @@ struct procinfo {
 				   currently installed */
 				/* Pointer to list of syscall trap handlers */
   struct procfs_syscall_handler *syscall_handlers; 
+  int saved_rtnval;		/* return value and status for wait(), */
+  int saved_statval;		/*  as supplied by a syscall handler. */
   int new_child;		/* Non-zero if it's a new thread */
 };
 
@@ -635,14 +656,14 @@ static void procfs_resume PARAMS ((int pid, int step,
 /* External function prototypes that can't be easily included in any
    header file because the args are typedefs in system include files. */
 
-extern void supply_gregset PARAMS ((gregset_t *));
+extern void supply_gregset PARAMS ((gdb_gregset_t *));
 
-extern void fill_gregset PARAMS ((gregset_t *, int));
+extern void fill_gregset PARAMS ((gdb_gregset_t *, int));
 
 #ifdef FP0_REGNUM
-extern void supply_fpregset PARAMS ((fpregset_t *));
+extern void supply_fpregset PARAMS ((gdb_fpregset_t *));
 
-extern void fill_fpregset PARAMS ((fpregset_t *, int));
+extern void fill_fpregset PARAMS ((gdb_fpregset_t *, int));
 #endif
 
 /*
@@ -1997,7 +2018,7 @@ procfs_store_registers (regno)
       procfs_read_status (pi);
       memcpy ((char *) &greg.gregset,
          (char *) &pi->prstatus.pr_lwp.pr_context.uc_mcontext.gregs,
-         sizeof (gregset_t));
+         sizeof (gdb_gregset_t));
     }
   fill_gregset (&greg.gregset, regno);
   greg.cmd = PCSREG;
@@ -2023,7 +2044,7 @@ procfs_store_registers (regno)
       procfs_read_status (pi);
       memcpy ((char *) &fpreg.fpregset,
           (char *) &pi->prstatus.pr_lwp.pr_context.uc_mcontext.fpregs,
-          sizeof (fpregset_t));
+          sizeof (gdb_fpregset_t));
     }
   fill_fpregset (&fpreg.fpregset, regno);
   fpreg.cmd = PCSFPREG;
@@ -3359,31 +3380,68 @@ procfs_wait (pid, ourstatus)
   struct procinfo *pi;
   struct proc_ctl pctl;
 
-  if (pid != -1)		/* Non-specific process? */
-    pi = NULL;
-  else
-    for (pi = procinfo_list; pi; pi = pi->next)
-      if (pi->had_event)
-	break;
+scan_again:
+
+  /* handle all syscall events first, otherwise we might not
+     notice a thread was created until too late. */
+
+  for (pi = procinfo_list; pi; pi = pi->next)
+    {
+      if (!pi->had_event)
+	continue;
+
+#ifdef UNIXWARE
+      if (! (pi->prstatus.pr_lwp.pr_flags & (PR_STOPPED | PR_ISTOP)) )
+	continue;
+
+      why = pi->prstatus.pr_lwp.pr_why;
+      what = pi->prstatus.pr_lwp.pr_what;
+#else
+      if (! (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)) )
+	continue;
+
+      why = pi->prstatus.pr_why;
+      what = pi->prstatus.pr_what;
+#endif
+      if (why == PR_SYSENTRY || why == PR_SYSEXIT)
+	{
+	  int i;
+	  int found_handler = 0;
+
+	  for (i = 0; i < pi->num_syscall_handlers; i++)
+	    if (pi->syscall_handlers[i].syscall_num == what)
+	      {
+		found_handler = 1;
+		pi->saved_rtnval = pi->pid;
+		pi->saved_statval = 0;
+		if (!pi->syscall_handlers[i].func
+		    (pi, what, why, &pi->saved_rtnval, &pi->saved_statval))
+		  pi->had_event = 0;
+		break;
+	      }
+
+	  if (!found_handler)
+	    {
+	      if (why == PR_SYSENTRY)
+		error ("PR_SYSENTRY, unhandled system call %d", what);
+	      else
+		error ("PR_SYSEXIT, unhandled system call %d", what);
+	    }
+	}
+    }
+
+  /* find a relevant process with an event */
+
+  for (pi = procinfo_list; pi; pi = pi->next)
+    if (pi->had_event && (pid == -1 || pi->pid == pid))
+      break;
 
   if (!pi)
     {
-    wait_again:
-
-      if (pi)
-	pi->had_event = 0;
-
-      pi = wait_fd ();
+      wait_fd ();
+      goto scan_again;
     }
 
-  if (pid != -1)
-    for (pi = procinfo_list; pi; pi = pi->next)
-      if (pi->pid == pid && pi->had_event)
-	break;
-
-  if (!pi && !checkerr)
-    goto wait_again;
-
 #ifdef UNIXWARE
   if (!checkerr && !(pi->prstatus.pr_lwp.pr_flags & (PR_STOPPED | PR_ISTOP)))
 #else
@@ -3438,27 +3496,8 @@ procfs_wait (pid, ourstatus)
 	  break;
 	case PR_SYSENTRY:
 	case PR_SYSEXIT:
-	  {
-	    int i;
-	    int found_handler = 0;
-
-	    for (i = 0; i < pi->num_syscall_handlers; i++)
-	      if (pi->syscall_handlers[i].syscall_num == what)
-		{
-		  found_handler = 1;
-		  if (!pi->syscall_handlers[i].func (pi, what, why,
-						     &rtnval, &statval))
-		    goto wait_again;
-
-		  break;
-		}
-
-	    if (!found_handler)
-	      if (why == PR_SYSENTRY)
-		error ("PR_SYSENTRY, unhandled system call %d", what);
-	      else
-		error ("PR_SYSEXIT, unhandled system call %d", what);
-	  }
+	  rtnval = pi->saved_rtnval;
+	  statval = pi->saved_statval;
 	  break;
 	case PR_REQUESTED:
 	  statval = (SIGSTOP << 8) | 0177;

gdb/sol-thread.c

@@ -46,17 +46,6 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
    procfs.c.  */
 
 #include "defs.h"
-
-/* Undefine gregset_t and fpregset_t to avoid conflict with defs in xm file. */
-
-#ifdef gregset_t
-#undef gregset_t
-#endif
-
-#ifdef fpregset_t
-#undef fpregset_t
-#endif
-
 #include <thread.h>
 #include <proc_service.h>
 #include <thread_db.h>