Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 568 insertions, 0 deletions

diff --git a/arch/parisc/math-emu/float.h b/arch/parisc/math-emu/float.h
new file mode 100644
index 000000000..531bbda5e
--- /dev/null
+++ b/arch/parisc/math-emu/float.h
@@ -0,0 +1,568 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Linux/PA-RISC Project (http://www.parisc-linux.org/)
+ *
+ * Floating-point emulation code
+ *  Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
+ */
+/*
+ * BEGIN_DESC
+ * 
+ *  File: 
+ *      @(#)	pa/spmath/float.h		$Revision: 1.1 $
+ * 
+ *  Purpose:
+ *      <<please update with a synopis of the functionality provided by this file>>
+ * 
+ *  BE header:  no
+ *
+ *  Shipped:  yes
+ *	/usr/conf/pa/spmath/float.h
+ *
+ * END_DESC  
+*/
+
+#ifdef __NO_PA_HDRS
+    PA header file -- do not include this header file for non-PA builds.
+#endif
+
+#include "fpbits.h"
+#include "hppa.h"
+/*
+ * Want to pick up the FPU capability flags, not the PDC structures.
+ * 'LOCORE' isn't really true in this case, but we don't want the C structures
+ * so it suits our purposes
+ */
+#define LOCORE
+#include "fpu.h"
+
+/*
+ * Declare the basic structures for the 3 different
+ * floating-point precisions.
+ *        
+ * Single number  
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |s|       exp     |               mantissa                      |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ */
+#define	Sall(object) (object)
+#define	Ssign(object) Bitfield_extract( 0,  1,object)
+#define	Ssignedsign(object) Bitfield_signed_extract( 0,  1,object)
+#define	Sexponent(object) Bitfield_extract( 1,  8,object)
+#define	Smantissa(object) Bitfield_mask( 9, 23,object)
+#define	Ssignaling(object) Bitfield_extract( 9,  1,object)
+#define	Ssignalingnan(object) Bitfield_extract( 1,  9,object)
+#define	Shigh2mantissa(object) Bitfield_extract( 9,  2,object)
+#define	Sexponentmantissa(object) Bitfield_mask( 1, 31,object)
+#define	Ssignexponent(object) Bitfield_extract( 0,  9,object)
+#define	Shidden(object) Bitfield_extract( 8,  1,object)
+#define	Shiddenoverflow(object) Bitfield_extract( 7,  1,object)
+#define	Shiddenhigh7mantissa(object) Bitfield_extract( 8,  8,object)
+#define	Shiddenhigh3mantissa(object) Bitfield_extract( 8,  4,object)
+#define	Slow(object) Bitfield_mask( 31,  1,object)
+#define	Slow4(object) Bitfield_mask( 28,  4,object)
+#define	Slow31(object) Bitfield_mask( 1, 31,object)
+#define	Shigh31(object) Bitfield_extract( 0, 31,object)
+#define	Ssignedhigh31(object) Bitfield_signed_extract( 0, 31,object)
+#define	Shigh4(object) Bitfield_extract( 0,  4,object)
+#define	Sbit24(object) Bitfield_extract( 24,  1,object)
+#define	Sbit28(object) Bitfield_extract( 28,  1,object)
+#define	Sbit29(object) Bitfield_extract( 29,  1,object)
+#define	Sbit30(object) Bitfield_extract( 30,  1,object)
+#define	Sbit31(object) Bitfield_mask( 31,  1,object)
+
+#define Deposit_ssign(object,value) Bitfield_deposit(value,0,1,object)
+#define Deposit_sexponent(object,value) Bitfield_deposit(value,1,8,object)
+#define Deposit_smantissa(object,value) Bitfield_deposit(value,9,23,object)
+#define Deposit_shigh2mantissa(object,value) Bitfield_deposit(value,9,2,object)
+#define Deposit_sexponentmantissa(object,value) \
+    Bitfield_deposit(value,1,31,object)
+#define Deposit_ssignexponent(object,value) Bitfield_deposit(value,0,9,object)
+#define Deposit_slow(object,value) Bitfield_deposit(value,31,1,object)
+#define Deposit_shigh4(object,value) Bitfield_deposit(value,0,4,object)
+
+#define	Is_ssign(object) Bitfield_mask( 0,  1,object)
+#define	Is_ssignaling(object) Bitfield_mask( 9,  1,object)
+#define	Is_shidden(object) Bitfield_mask( 8,  1,object)
+#define	Is_shiddenoverflow(object) Bitfield_mask( 7,  1,object)
+#define	Is_slow(object) Bitfield_mask( 31,  1,object)
+#define	Is_sbit24(object) Bitfield_mask( 24,  1,object)
+#define	Is_sbit28(object) Bitfield_mask( 28,  1,object)
+#define	Is_sbit29(object) Bitfield_mask( 29,  1,object)
+#define	Is_sbit30(object) Bitfield_mask( 30,  1,object)
+#define	Is_sbit31(object) Bitfield_mask( 31,  1,object)
+
+/* 
+ * Double number.
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |s|       exponent      |          mantissa part 1              |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |                    mantissa part 2                            |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ */
+#define Dallp1(object) (object)
+#define Dsign(object) Bitfield_extract( 0,  1,object)
+#define Dsignedsign(object) Bitfield_signed_extract( 0,  1,object)
+#define Dexponent(object) Bitfield_extract( 1,  11,object)
+#define Dmantissap1(object) Bitfield_mask( 12, 20,object)
+#define Dsignaling(object) Bitfield_extract( 12,  1,object)
+#define Dsignalingnan(object) Bitfield_extract( 1,  12,object)
+#define Dhigh2mantissa(object) Bitfield_extract( 12,  2,object)
+#define Dexponentmantissap1(object) Bitfield_mask( 1, 31,object)
+#define Dsignexponent(object) Bitfield_extract( 0, 12,object)
+#define Dhidden(object) Bitfield_extract( 11,  1,object)
+#define Dhiddenoverflow(object) Bitfield_extract( 10,  1,object)
+#define Dhiddenhigh7mantissa(object) Bitfield_extract( 11,  8,object)
+#define Dhiddenhigh3mantissa(object) Bitfield_extract( 11,  4,object)
+#define Dlowp1(object) Bitfield_mask( 31,  1,object)
+#define Dlow31p1(object) Bitfield_mask( 1, 31,object)
+#define Dhighp1(object) Bitfield_extract( 0,  1,object)
+#define Dhigh4p1(object) Bitfield_extract( 0,  4,object)
+#define Dhigh31p1(object) Bitfield_extract( 0, 31,object)
+#define Dsignedhigh31p1(object) Bitfield_signed_extract( 0, 31,object)
+#define Dbit3p1(object) Bitfield_extract( 3,  1,object)
+
+#define Deposit_dsign(object,value) Bitfield_deposit(value,0,1,object)
+#define Deposit_dexponent(object,value) Bitfield_deposit(value,1,11,object)
+#define Deposit_dmantissap1(object,value) Bitfield_deposit(value,12,20,object)
+#define Deposit_dhigh2mantissa(object,value) Bitfield_deposit(value,12,2,object)
+#define Deposit_dexponentmantissap1(object,value) \
+    Bitfield_deposit(value,1,31,object)
+#define Deposit_dsignexponent(object,value) Bitfield_deposit(value,0,12,object)
+#define Deposit_dlowp1(object,value) Bitfield_deposit(value,31,1,object)
+#define Deposit_dhigh4p1(object,value) Bitfield_deposit(value,0,4,object)
+
+#define Is_dsign(object) Bitfield_mask( 0,  1,object)
+#define Is_dsignaling(object) Bitfield_mask( 12,  1,object)
+#define Is_dhidden(object) Bitfield_mask( 11,  1,object)
+#define Is_dhiddenoverflow(object) Bitfield_mask( 10,  1,object)
+#define Is_dlowp1(object) Bitfield_mask( 31,  1,object)
+#define Is_dhighp1(object) Bitfield_mask( 0,  1,object)
+#define Is_dbit3p1(object) Bitfield_mask( 3,  1,object)
+
+#define Dallp2(object) (object)
+#define Dmantissap2(object) (object)
+#define Dlowp2(object) Bitfield_mask( 31,  1,object)
+#define Dlow4p2(object) Bitfield_mask( 28,  4,object)
+#define Dlow31p2(object) Bitfield_mask( 1, 31,object)
+#define Dhighp2(object) Bitfield_extract( 0,  1,object)
+#define Dhigh31p2(object) Bitfield_extract( 0, 31,object)
+#define Dbit2p2(object) Bitfield_extract( 2,  1,object)
+#define Dbit3p2(object) Bitfield_extract( 3,  1,object)
+#define Dbit21p2(object) Bitfield_extract( 21,  1,object)
+#define Dbit28p2(object) Bitfield_extract( 28,  1,object)
+#define Dbit29p2(object) Bitfield_extract( 29,  1,object)
+#define Dbit30p2(object) Bitfield_extract( 30,  1,object)
+#define Dbit31p2(object) Bitfield_mask( 31,  1,object)
+
+#define Deposit_dlowp2(object,value) Bitfield_deposit(value,31,1,object)
+
+#define Is_dlowp2(object) Bitfield_mask( 31,  1,object)
+#define Is_dhighp2(object) Bitfield_mask( 0,  1,object)
+#define Is_dbit2p2(object) Bitfield_mask( 2,  1,object)
+#define Is_dbit3p2(object) Bitfield_mask( 3,  1,object)
+#define Is_dbit21p2(object) Bitfield_mask( 21,  1,object)
+#define Is_dbit28p2(object) Bitfield_mask( 28,  1,object)
+#define Is_dbit29p2(object) Bitfield_mask( 29,  1,object)
+#define Is_dbit30p2(object) Bitfield_mask( 30,  1,object)
+#define Is_dbit31p2(object) Bitfield_mask( 31,  1,object)
+
+/* 
+ * Quad number.
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |s|          exponent           |      mantissa part 1          |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |                    mantissa part 2                            |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |                    mantissa part 3                            |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |                    mantissa part 4                            |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ */
+typedef struct
+    {
+    union
+	{
+	struct { unsigned qallp1; } u_qallp1;
+/* Not needed for now...
+	Bitfield_extract( 0,  1,u_qsign,qsign)
+	Bitfield_signed_extract( 0,  1,u_qsignedsign,qsignedsign)
+	Bitfield_extract( 1, 15,u_qexponent,qexponent)
+	Bitfield_extract(16, 16,u_qmantissap1,qmantissap1)
+	Bitfield_extract(16,  1,u_qsignaling,qsignaling)
+	Bitfield_extract(1,  16,u_qsignalingnan,qsignalingnan)
+	Bitfield_extract(16,  2,u_qhigh2mantissa,qhigh2mantissa)
+	Bitfield_extract( 1, 31,u_qexponentmantissap1,qexponentmantissap1)
+	Bitfield_extract( 0, 16,u_qsignexponent,qsignexponent)
+	Bitfield_extract(15,  1,u_qhidden,qhidden)
+	Bitfield_extract(14,  1,u_qhiddenoverflow,qhiddenoverflow)
+	Bitfield_extract(15,  8,u_qhiddenhigh7mantissa,qhiddenhigh7mantissa)
+	Bitfield_extract(15,  4,u_qhiddenhigh3mantissa,qhiddenhigh3mantissa)
+	Bitfield_extract(31,  1,u_qlowp1,qlowp1)
+	Bitfield_extract( 1, 31,u_qlow31p1,qlow31p1)
+	Bitfield_extract( 0,  1,u_qhighp1,qhighp1)
+	Bitfield_extract( 0,  4,u_qhigh4p1,qhigh4p1)
+	Bitfield_extract( 0, 31,u_qhigh31p1,qhigh31p1)
+  */
+	} quad_u1;
+    union
+	{
+	struct { unsigned qallp2; } u_qallp2;
+  /* Not needed for now...
+	Bitfield_extract(31,  1,u_qlowp2,qlowp2)
+	Bitfield_extract( 1, 31,u_qlow31p2,qlow31p2)
+	Bitfield_extract( 0,  1,u_qhighp2,qhighp2)
+	Bitfield_extract( 0, 31,u_qhigh31p2,qhigh31p2)
+   */
+	} quad_u2;
+    union
+	{
+	struct { unsigned qallp3; } u_qallp3;
+  /* Not needed for now...
+	Bitfield_extract(31,  1,u_qlowp3,qlowp3)
+	Bitfield_extract( 1, 31,u_qlow31p3,qlow31p3)
+	Bitfield_extract( 0,  1,u_qhighp3,qhighp3)
+	Bitfield_extract( 0, 31,u_qhigh31p3,qhigh31p3)
+   */ 
+	} quad_u3;
+    union
+	{
+	struct { unsigned qallp4; } u_qallp4;
+    /* Not need for now...
+	Bitfield_extract(31,  1,u_qlowp4,qlowp4)
+	Bitfield_extract( 1, 31,u_qlow31p4,qlow31p4)
+	Bitfield_extract( 0,  1,u_qhighp4,qhighp4)
+	Bitfield_extract( 0, 31,u_qhigh31p4,qhigh31p4)
+     */
+	} quad_u4;
+    } quad_floating_point;
+
+/* Extension - An additional structure to hold the guard, round and
+ *             sticky bits during computations.
+ */
+#define Extall(object) (object)
+#define Extsign(object) Bitfield_extract( 0,  1,object)
+#define Exthigh31(object) Bitfield_extract( 0, 31,object)
+#define Extlow31(object) Bitfield_extract( 1, 31,object)
+#define Extlow(object) Bitfield_extract( 31,  1,object)
+
+/*
+ * Single extended - The upper word is just like single precision,
+ *                 but one additional word of mantissa is needed.
+ */
+#define Sextallp1(object) (object)
+#define Sextallp2(object) (object)
+#define Sextlowp1(object) Bitfield_extract( 31,  1,object)
+#define Sexthighp2(object) Bitfield_extract( 0,  1,object)
+#define Sextlow31p2(object) Bitfield_extract( 1, 31,object)
+#define Sexthiddenoverflow(object) Bitfield_extract( 4,  1,object)
+#define Is_sexthiddenoverflow(object) Bitfield_mask( 4,  1,object)
+
+/*
+ * Double extended - The upper two words are just like double precision,
+ *		     but two additional words of mantissa are needed.
+ */
+#define Dextallp1(object) (object)
+#define Dextallp2(object) (object)
+#define Dextallp3(object) (object)
+#define Dextallp4(object) (object)
+#define Dextlowp2(object) Bitfield_extract( 31,  1,object)
+#define Dexthighp3(object) Bitfield_extract( 0,  1,object)
+#define Dextlow31p3(object) Bitfield_extract( 1, 31,object)
+#define Dexthiddenoverflow(object) Bitfield_extract( 10,  1,object)
+#define Is_dexthiddenoverflow(object) Bitfield_mask( 10,  1,object)
+#define Deposit_dextlowp4(object,value) Bitfield_deposit(value,31,1,object)
+
+/*
+ * Declare the basic structures for the 3 different
+ * fixed-point precisions.
+ *        
+ * Single number  
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |s|                    integer                                  |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ */
+typedef int sgl_integer;
+
+/* 
+ * Double number.
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |s|                     high integer                            |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |                       low integer                             |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ */
+struct dint {
+        int  wd0;
+        unsigned int wd1;
+};
+
+struct dblwd {
+        unsigned int wd0;
+        unsigned int wd1;
+};
+
+/* 
+ * Quad number.
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |s|                  integer part1                              |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |                    integer part 2                             |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |                    integer part 3                             |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ *
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |                    integer part 4                             |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ */
+
+struct quadwd {
+        int  wd0;
+        unsigned int wd1;
+        unsigned int wd2;
+        unsigned int wd3;
+};
+
+typedef struct quadwd quad_integer;
+
+
+/* useful typedefs */
+typedef unsigned int sgl_floating_point;
+typedef struct dblwd dbl_floating_point;
+typedef struct dint dbl_integer;
+typedef struct dblwd dbl_unsigned;
+
+/* 
+ * Define the different precisions' parameters.
+ */
+#define SGL_BITLENGTH 32
+#define SGL_EMAX 127
+#define SGL_EMIN (-126)
+#define SGL_BIAS 127
+#define SGL_WRAP 192
+#define SGL_INFINITY_EXPONENT (SGL_EMAX+SGL_BIAS+1)
+#define SGL_THRESHOLD 32
+#define SGL_EXP_LENGTH 8
+#define SGL_P 24
+
+#define DBL_BITLENGTH 64
+#define DBL_EMAX 1023
+#define DBL_EMIN (-1022)
+#define DBL_BIAS 1023
+#define DBL_WRAP 1536
+#define DBL_INFINITY_EXPONENT (DBL_EMAX+DBL_BIAS+1)
+#define DBL_THRESHOLD 64
+#define DBL_EXP_LENGTH 11
+#define DBL_P 53
+
+#define QUAD_BITLENGTH 128
+#define QUAD_EMAX 16383
+#define QUAD_EMIN (-16382)
+#define QUAD_BIAS 16383
+#define QUAD_WRAP 24576
+#define QUAD_INFINITY_EXPONENT (QUAD_EMAX+QUAD_BIAS+1)
+#define QUAD_P 113
+
+/* Boolean Values etc. */
+#define FALSE 0
+#define TRUE (!FALSE)
+#define NOT !
+#define XOR ^
+
+/* other constants */
+#undef NULL
+#define NULL 0
+#define NIL 0
+#define SGL 0
+#define DBL 1
+#define BADFMT 2
+#define QUAD 3
+
+
+/* Types */
+typedef int boolean;
+typedef int FORMAT;
+typedef int VOID;
+
+
+/* Declare status register equivalent to FPUs architecture.
+ *
+ *  0 1 2 3 4 5 6 7 8 910 1 2 3 4 5 6 7 8 920 1 2 3 4 5 6 7 8 930 1
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |V|Z|O|U|I|C|  rsv  |  model    | version |RM |rsv|T|r|V|Z|O|U|I|
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ */
+#define Cbit(object) Bitfield_extract( 5, 1,object)
+#define Tbit(object) Bitfield_extract( 25, 1,object)
+#define Roundingmode(object) Bitfield_extract( 21, 2,object)
+#define Invalidtrap(object) Bitfield_extract( 27, 1,object)
+#define Divisionbyzerotrap(object) Bitfield_extract( 28, 1,object)
+#define Overflowtrap(object) Bitfield_extract( 29, 1,object)
+#define Underflowtrap(object) Bitfield_extract( 30, 1,object)
+#define Inexacttrap(object) Bitfield_extract( 31, 1,object)
+#define Invalidflag(object) Bitfield_extract( 0, 1,object)
+#define Divisionbyzeroflag(object) Bitfield_extract( 1, 1,object)
+#define Overflowflag(object) Bitfield_extract( 2, 1,object)
+#define Underflowflag(object) Bitfield_extract( 3, 1,object)
+#define Inexactflag(object) Bitfield_extract( 4, 1,object)
+#define Allflags(object) Bitfield_extract( 0, 5,object)
+
+/* Definitions relevant to the status register */
+
+/* Rounding Modes */
+#define ROUNDNEAREST 0
+#define ROUNDZERO    1
+#define ROUNDPLUS    2
+#define ROUNDMINUS   3
+
+/* Exceptions */
+#define NOEXCEPTION		0x0
+#define INVALIDEXCEPTION	0x20
+#define DIVISIONBYZEROEXCEPTION	0x10
+#define OVERFLOWEXCEPTION	0x08
+#define UNDERFLOWEXCEPTION	0x04
+#define INEXACTEXCEPTION	0x02
+#define UNIMPLEMENTEDEXCEPTION	0x01
+
+/* New exceptions for the 2E Opcode */
+#define OPC_2E_INVALIDEXCEPTION     0x30
+#define OPC_2E_OVERFLOWEXCEPTION    0x18
+#define OPC_2E_UNDERFLOWEXCEPTION   0x0c
+#define OPC_2E_INEXACTEXCEPTION     0x12
+
+/* Declare exception registers equivalent to FPUs architecture 
+ *
+ *  0 1 2 3 4 5 6 7 8 910 1 2 3 4 5 6 7 8 920 1 2 3 4 5 6 7 8 930 1
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |excepttype |  r1     | r2/ext  |  operation  |parm |n| t/cond  |
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ */
+#define Allexception(object) (object)
+#define Exceptiontype(object) Bitfield_extract( 0, 6,object)
+#define Instructionfield(object) Bitfield_mask( 6,26,object)
+#define Parmfield(object) Bitfield_extract( 23, 3,object)
+#define Rabit(object) Bitfield_extract( 24, 1,object)
+#define Ibit(object) Bitfield_extract( 25, 1,object)
+
+#define Set_exceptiontype(object,value) Bitfield_deposit(value, 0, 6,object)
+#define Set_parmfield(object,value) Bitfield_deposit(value, 23, 3,object)
+#define Set_exceptiontype_and_instr_field(exception,instruction,object) \
+    object = exception << 26 | instruction
+
+/* Declare the condition field
+ *
+ *  0 1 2 3 4 5 6 7 8 910 1 2 3 4 5 6 7 8 920 1 2 3 4 5 6 7 8 930 1
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ * |                                                     |G|L|E|U|X|
+ * +-------+-------+-------+-------+-------+-------+-------+-------+
+ */
+#define Greaterthanbit(object) Bitfield_extract( 27, 1,object)
+#define Lessthanbit(object) Bitfield_extract( 28, 1,object)
+#define Equalbit(object) Bitfield_extract( 29, 1,object)
+#define Unorderedbit(object) Bitfield_extract( 30, 1,object)
+#define Exceptionbit(object) Bitfield_extract( 31, 1,object)
+
+/* An alias name for the status register */
+#define Fpustatus_register (*status)
+
+/**************************************************
+ * Status register referencing and manipulation.  *
+ **************************************************/
+
+/* Rounding mode */
+#define Rounding_mode()  Roundingmode(Fpustatus_register)
+#define Is_rounding_mode(rmode) \
+    (Roundingmode(Fpustatus_register) == rmode)
+#define Set_rounding_mode(value) \
+    Bitfield_deposit(value,21,2,Fpustatus_register)
+
+/* Boolean testing of the trap enable bits */
+#define Is_invalidtrap_enabled() Invalidtrap(Fpustatus_register)
+#define Is_divisionbyzerotrap_enabled() Divisionbyzerotrap(Fpustatus_register)
+#define Is_overflowtrap_enabled() Overflowtrap(Fpustatus_register)
+#define Is_underflowtrap_enabled() Underflowtrap(Fpustatus_register)
+#define Is_inexacttrap_enabled() Inexacttrap(Fpustatus_register)
+
+/* Set the indicated flags in the status register */
+#define Set_invalidflag() Bitfield_deposit(1,0,1,Fpustatus_register)
+#define Set_divisionbyzeroflag() Bitfield_deposit(1,1,1,Fpustatus_register)
+#define Set_overflowflag() Bitfield_deposit(1,2,1,Fpustatus_register)
+#define Set_underflowflag() Bitfield_deposit(1,3,1,Fpustatus_register)
+#define Set_inexactflag() Bitfield_deposit(1,4,1,Fpustatus_register)
+
+#define Clear_all_flags() Bitfield_deposit(0,0,5,Fpustatus_register)
+
+/* Manipulate the trap and condition code bits (tbit and cbit) */
+#define Set_tbit() Bitfield_deposit(1,25,1,Fpustatus_register)
+#define Clear_tbit() Bitfield_deposit(0,25,1,Fpustatus_register)
+#define Is_tbit_set() Tbit(Fpustatus_register)
+#define Is_cbit_set() Cbit(Fpustatus_register)
+
+#define Set_status_cbit(value)  \
+        Bitfield_deposit(value,5,1,Fpustatus_register)
+
+/*******************************
+ * Condition field referencing *
+ *******************************/
+#define Unordered(cond) Unorderedbit(cond)
+#define Equal(cond) Equalbit(cond)
+#define Lessthan(cond) Lessthanbit(cond)
+#define Greaterthan(cond) Greaterthanbit(cond)
+#define Exception(cond) Exceptionbit(cond)
+
+
+/* Defines for the extension */
+#define Ext_isone_sign(extent) (Extsign(extent))
+#define Ext_isnotzero(extent) \
+    (Extall(extent))
+#define Ext_isnotzero_lower(extent) \
+    (Extlow31(extent))
+#define Ext_leftshiftby1(extent) \
+    Extall(extent) <<= 1
+#define Ext_negate(extent) \
+    (int )Extall(extent) = 0 - (int )Extall(extent)
+#define Ext_setone_low(extent) Bitfield_deposit(1,31,1,extent)
+#define Ext_setzero(extent) Extall(extent) = 0
+
+typedef int operation;
+
+/* error messages */
+
+#define		NONE		0
+#define		UNDEFFPINST	1
+
+/* Function definitions: opcode, opclass */
+#define FTEST	(1<<2) | 0
+#define FCPY	(2<<2) | 0
+#define FABS	(3<<2) | 0
+#define FSQRT   (4<<2) | 0
+#define FRND    (5<<2) | 0
+
+#define FCNVFF	(0<<2) | 1
+#define FCNVXF	(1<<2) | 1
+#define FCNVFX	(2<<2) | 1
+#define FCNVFXT	(3<<2) | 1
+
+#define FCMP    (0<<2) | 2
+
+#define FADD	(0<<2) | 3
+#define FSUB	(1<<2) | 3
+#define FMPY	(2<<2) | 3
+#define FDIV	(3<<2) | 3
+#define FREM	(4<<2) | 3
+