diff options
Diffstat (limited to 'arch/arm26/nwfpe/fpmodule.c')
| -rw-r--r-- | arch/arm26/nwfpe/fpmodule.c | 180 |
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 a8fad92..0000000 --- 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); |
