From: Hans-Peter Nilsson <hp@axis.com>
Date: Thu, 17 Nov 2005 16:14:53 +0000 (+0000)
Subject: 	* cris/sim-main.h (struct _sim_cpu): New members last_syscall,
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ed1f044ac6423184b2e2b8f805ddc4f76ea1256c;p=binutils-gdb.git

	* cris/sim-main.h (struct _sim_cpu): New members last_syscall,
	last_open_fd, last_open_flags.
	* cris/traps.c: Don't include targ-vals.h.
	(TARGET_O_ACCMODE): Define.
	(cris_break_13_handler): Set new _sim_cpu members.
	<case TARGET_SYS_fcntl>: Support special case of F_GETFL.
	Rearrange code as switch.  Emit "unimplemented" abort for
	unimplemented fcntl calls.
---

diff --git a/sim/ChangeLog b/sim/ChangeLog
index 9bc31eba5b9..e552e10aaaf 100644
--- a/sim/ChangeLog
+++ b/sim/ChangeLog
@@ -1,5 +1,14 @@
 2005-11-17  Hans-Peter Nilsson  <hp@axis.com>
 
+	* cris/sim-main.h (struct _sim_cpu): New members last_syscall,
+	last_open_fd, last_open_flags.
+	* cris/traps.c: Don't include targ-vals.h.
+	(TARGET_O_ACCMODE): Define.
+	(cris_break_13_handler): Set new _sim_cpu members.
+	<case TARGET_SYS_fcntl>: Support special case of F_GETFL.
+	Rearrange code as switch.  Emit "unimplemented" abort for
+	unimplemented fcntl calls.
+
 	* cris/traps.c (TARGET_SYS_stat): Define.
 	(syscall_stat32_map): Add entry for TARGET_SYS_stat.
 	(cris_break_13_handler) <case TARGET_SYS_stat>: New case.
diff --git a/sim/cris/sim-main.h b/sim/cris/sim-main.h
index b6715330065..b35b927278e 100644
--- a/sim/cris/sim-main.h
+++ b/sim/cris/sim-main.h
@@ -166,6 +166,17 @@ struct _sim_cpu {
      for sigmasks and sigpendings. */
   USI sighandler[64];
 
+  /* This is a hack to implement just the parts of fcntl F_GETFL that
+     are used in open+fdopen calls for the standard scenario: for such
+     a call we check that the last syscall was open, we check that the
+     passed fd is the same returned then, and so we return the same
+     flags passed to open.  This way, we avoid complicating the
+     generic sim callback machinery by introducing fcntl
+     mechanisms.  */
+  USI last_syscall;
+  USI last_open_fd;
+  USI last_open_flags;
+
   /* Function for initializing CPU thread context, which varies in size
      with each CPU model.  They should be in some constant parts or
      initialized in *_init_cpu, but we can't modify that for now.  */
diff --git a/sim/cris/traps.c b/sim/cris/traps.c
index 11cfaae95a0..607f72c6345 100644
--- a/sim/cris/traps.c
+++ b/sim/cris/traps.c
@@ -20,8 +20,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "sim-main.h"
 #include "sim-options.h"
-#include "targ-vals.h"
 #include "bfd.h"
+/* FIXME: get rid of targ-vals.h usage everywhere else.  */
+
 #ifdef HAVE_ERRNO_H
 #include <errno.h>
 #endif
@@ -663,6 +664,9 @@ static const CB_TARGET_DEFS_MAP errno_map[] =
    installation and removing synonyms and unnecessary items.  Don't
    forget the end-marker.  */
 
+/* This one we treat specially, as it's used in the fcntl syscall.  */
+#define TARGET_O_ACCMODE 3
+
 static const CB_TARGET_DEFS_MAP open_map[] = {
 #ifdef O_ACCMODE
   { O_ACCMODE, 0x3 },
@@ -1399,8 +1403,9 @@ cris_break_13_handler (SIM_CPU *current_cpu, USI callnum, USI arg1,
 
 	case TARGET_SYS_fcntl64:
 	case TARGET_SYS_fcntl:
-	  if (arg2 == 1)
+	  switch (arg2)
 	    {
+	    case 1:
 	      /* F_GETFD.
 		 Glibc checks stdin, stdout and stderr fd:s for
 		 close-on-exec security sanity.  We just need to provide a
@@ -1408,12 +1413,35 @@ cris_break_13_handler (SIM_CPU *current_cpu, USI callnum, USI arg1,
 		 close-on-exec flag true, we could just do a real fcntl
 		 here.  */
 	      retval = 0;
-	    }
-	  else if (arg2 == 2)
-	    {
+	      break;
+
+	    case 2:
 	      /* F_SETFD.  Just ignore attempts to set the close-on-exec
 		 flag.  */
 	      retval = 0;
+	      break;
+
+	    case 3:
+	      /* F_GETFL.  Check for the special case for open+fdopen.  */
+	      if (current_cpu->last_syscall == TARGET_SYS_open
+		  && arg1 == current_cpu->last_open_fd)
+		{
+		  retval = current_cpu->last_open_flags & TARGET_O_ACCMODE;
+		  break;
+		}
+	      /* FALLTHROUGH */
+	      /* Abort for all other cases.  */
+	    default:
+	      sim_io_eprintf (sd, "Unimplemented %s syscall "
+			      "(fd: 0x%lx: cmd: 0x%lx arg: 0x%lx)\n",
+			      callnum == TARGET_SYS_fcntl
+			      ? "fcntl" : "fcntl64",
+			      (unsigned long) (USI) arg1,
+			      (unsigned long) (USI) arg2,
+			      (unsigned long) (USI) arg3);
+	      sim_engine_halt (sd, current_cpu, NULL, pc, sim_stopped,
+			       SIM_SIGILL);
+	      break;
 	    }
 	  break;
 
@@ -2819,6 +2847,14 @@ cris_break_13_handler (SIM_CPU *current_cpu, USI callnum, USI arg1,
 	}
     }
 
+  /* Minimal support for fcntl F_GETFL as used in open+fdopen.  */
+  if (callnum == TARGET_SYS_open)
+    {
+      current_cpu->last_open_fd = retval;
+      current_cpu->last_open_flags = arg2;
+    }
+  current_cpu->last_syscall = callnum;
+
   /* A system call is a rescheduling point.  For the time being, we don't
      reschedule anywhere else.  */
   if (current_cpu->m1threads != 0