aboutsummaryrefslogtreecommitdiff
path: root/arch/arm26/nwfpe/fpmodule.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm26/nwfpe/fpmodule.c')
-rw-r--r--arch/arm26/nwfpe/fpmodule.c180
1 files changed, 0 insertions, 180 deletions
diff --git a/arch/arm26/nwfpe/fpmodule.c b/arch/arm26/nwfpe/fpmodule.c
deleted file mode 100644
index a8fad92eb44..00000000000
--- a/arch/arm26/nwfpe/fpmodule.c
+++ /dev/null
@@ -1,180 +0,0 @@
-
-/*
- NetWinder Floating Point Emulator
- (c) Rebel.com, 1998-1999
- (c) Philip Blundell, 1998-1999
-
- Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
-
- 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., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
-
-#include "fpa11.h"
-
-#include <linux/module.h>
-#include <linux/version.h>
-
-/* XXX */
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/init.h>
-/* XXX */
-
-#include "softfloat.h"
-#include "fpopcode.h"
-#include "fpmodule.h"
-#include "fpa11.inl"
-
-/* kernel symbols required for signal handling */
-typedef struct task_struct* PTASK;
-
-#ifdef MODULE
-void fp_send_sig(unsigned long sig, PTASK p, int priv);
-
-MODULE_AUTHOR("Scott Bambrough <scottb@rebel.com>");
-MODULE_DESCRIPTION("NWFPE floating point emulator");
-
-#else
-#define fp_send_sig send_sig
-#define kern_fp_enter fp_enter
-
-extern char fpe_type[];
-#endif
-
-/* kernel function prototypes required */
-void fp_setup(void);
-
-/* external declarations for saved kernel symbols */
-extern void (*kern_fp_enter)(void);
-
-/* Original value of fp_enter from kernel before patched by fpe_init. */
-static void (*orig_fp_enter)(void);
-
-/* forward declarations */
-extern void nwfpe_enter(void);
-
-#ifdef MODULE
-/*
- * Return 0 if we can be unloaded. This can only happen if
- * kern_fp_enter is still pointing at nwfpe_enter
- */
-static int fpe_unload(void)
-{
- return (kern_fp_enter == nwfpe_enter) ? 0 : 1;
-}
-#endif
-
-static int __init fpe_init(void)
-{
- if (sizeof(FPA11) > sizeof(union fp_state)) {
- printk(KERN_ERR "nwfpe: bad structure size\n");
- return -EINVAL;
- }
-
- if (sizeof(FPREG) != 12) {
- printk(KERN_ERR "nwfpe: bad register size\n");
- return -EINVAL;
- }
-
-#ifdef MODULE
- if (!mod_member_present(&__this_module, can_unload))
- return -EINVAL;
- __this_module.can_unload = fpe_unload;
-#else
- if (fpe_type[0] && strcmp(fpe_type, "nwfpe"))
- return 0;
-#endif
-
- /* Display title, version and copyright information. */
- printk(KERN_WARNING "NetWinder Floating Point Emulator V0.95 "
- "(c) 1998-1999 Rebel.com\n");
-
- /* Save pointer to the old FP handler and then patch ourselves in */
- orig_fp_enter = kern_fp_enter;
- kern_fp_enter = nwfpe_enter;
-
- return 0;
-}
-
-static void __exit fpe_exit(void)
-{
- /* Restore the values we saved earlier. */
- kern_fp_enter = orig_fp_enter;
-}
-
-/*
-ScottB: November 4, 1998
-
-Moved this function out of softfloat-specialize into fpmodule.c.
-This effectively isolates all the changes required for integrating with the
-Linux kernel into fpmodule.c. Porting to NetBSD should only require modifying
-fpmodule.c to integrate with the NetBSD kernel (I hope!).
-
-[1/1/99: Not quite true any more unfortunately. There is Linux-specific
-code to access data in user space in some other source files at the
-moment (grep for get_user / put_user calls). --philb]
-
-float_exception_flags is a global variable in SoftFloat.
-
-This function is called by the SoftFloat routines to raise a floating
-point exception. We check the trap enable byte in the FPSR, and raise
-a SIGFPE exception if necessary. If not the relevant bits in the
-cumulative exceptions flag byte are set and we return.
-*/
-
-void float_raise(signed char flags)
-{
- register unsigned int fpsr, cumulativeTraps;
-
-#ifdef CONFIG_DEBUG_USER
- printk(KERN_DEBUG "NWFPE: %s[%d] takes exception %08x at %p from %08x\n",
- current->comm, current->pid, flags,
- __builtin_return_address(0), GET_USERREG()[15]);
-#endif
-
- /* Keep SoftFloat exception flags up to date. */
- float_exception_flags |= flags;
-
- /* Read fpsr and initialize the cumulativeTraps. */
- fpsr = readFPSR();
- cumulativeTraps = 0;
-
- /* For each type of exception, the cumulative trap exception bit is only
- set if the corresponding trap enable bit is not set. */
- if ((!(fpsr & BIT_IXE)) && (flags & BIT_IXC))
- cumulativeTraps |= BIT_IXC;
- if ((!(fpsr & BIT_UFE)) && (flags & BIT_UFC))
- cumulativeTraps |= BIT_UFC;
- if ((!(fpsr & BIT_OFE)) && (flags & BIT_OFC))
- cumulativeTraps |= BIT_OFC;
- if ((!(fpsr & BIT_DZE)) && (flags & BIT_DZC))
- cumulativeTraps |= BIT_DZC;
- if ((!(fpsr & BIT_IOE)) && (flags & BIT_IOC))
- cumulativeTraps |= BIT_IOC;
-
- /* Set the cumulative exceptions flags. */
- if (cumulativeTraps)
- writeFPSR(fpsr | cumulativeTraps);
-
- /* Raise an exception if necessary. */
- if (fpsr & (flags << 16))
- fp_send_sig(SIGFPE, current, 1);
-}
-
-module_init(fpe_init);
-module_exit(fpe_exit);