diff options
Diffstat (limited to 'arch/arm/nwfpe/fpmodule.c')
| -rw-r--r-- | arch/arm/nwfpe/fpmodule.c | 41 |
1 files changed, 31 insertions, 10 deletions
diff --git a/arch/arm/nwfpe/fpmodule.c b/arch/arm/nwfpe/fpmodule.c index 2dfe1ac42ee..4e729f055a8 100644 --- a/arch/arm/nwfpe/fpmodule.c +++ b/arch/arm/nwfpe/fpmodule.c @@ -24,7 +24,7 @@ #include "fpa11.h" #include <linux/module.h> -#include <linux/config.h> +#include <linux/moduleparam.h> /* XXX */ #include <linux/errno.h> @@ -33,7 +33,8 @@ #include <linux/signal.h> #include <linux/sched.h> #include <linux/init.h> -/* XXX */ + +#include <asm/thread_notify.h> #include "softfloat.h" #include "fpopcode.h" @@ -56,16 +57,28 @@ void fp_send_sig(unsigned long sig, struct task_struct *p, int priv); extern char fpe_type[]; #endif +static int nwfpe_notify(struct notifier_block *self, unsigned long cmd, void *v) +{ + struct thread_info *thread = v; + + if (cmd == THREAD_NOTIFY_FLUSH) + nwfpe_init_fpa(&thread->fpstate); + + return NOTIFY_DONE; +} + +static struct notifier_block nwfpe_notifier_block = { + .notifier_call = nwfpe_notify, +}; + /* kernel function prototypes required */ void fp_setup(void); /* external declarations for saved kernel symbols */ extern void (*kern_fp_enter)(void); -extern void (*fp_init)(union fp_state *); /* Original value of fp_enter from kernel before patched by fpe_init. */ static void (*orig_fp_enter)(void); -static void (*orig_fp_init)(union fp_state *); /* forward declarations */ extern void nwfpe_enter(void); @@ -88,20 +101,20 @@ static int __init fpe_init(void) printk(KERN_WARNING "NetWinder Floating Point Emulator V0.97 (" NWFPE_BITS " precision)\n"); + thread_register_notifier(&nwfpe_notifier_block); + /* Save pointer to the old FP handler and then patch ourselves in */ orig_fp_enter = kern_fp_enter; - orig_fp_init = fp_init; kern_fp_enter = nwfpe_enter; - fp_init = nwfpe_init_fpa; return 0; } static void __exit fpe_exit(void) { + thread_unregister_notifier(&nwfpe_notifier_block); /* Restore the values we saved earlier. */ kern_fp_enter = orig_fp_enter; - fp_init = orig_fp_init; } /* @@ -122,15 +135,19 @@ a SIGFPE exception if necessary. If not the relevant bits in the cumulative exceptions flag byte are set and we return. */ +#ifdef CONFIG_DEBUG_USER +/* By default, ignore inexact errors as there are far too many of them to log */ +static int debug = ~BIT_IXC; +#endif + void float_raise(signed char flags) { register unsigned int fpsr, cumulativeTraps; #ifdef CONFIG_DEBUG_USER - /* Ignore inexact errors as there are far too many of them to log */ - if (flags & ~BIT_IXC) + if (flags & debug) printk(KERN_DEBUG - "NWFPE: %s[%d] takes exception %08x at %p from %08lx\n", + "NWFPE: %s[%d] takes exception %08x at %pf from %08lx\n", current->comm, current->pid, flags, __builtin_return_address(0), GET_USERREG()->ARM_pc); #endif @@ -167,3 +184,7 @@ module_exit(fpe_exit); MODULE_AUTHOR("Scott Bambrough <scottb@rebel.com>"); MODULE_DESCRIPTION("NWFPE floating point emulator (" NWFPE_BITS " precision)"); MODULE_LICENSE("GPL"); + +#ifdef CONFIG_DEBUG_USER +module_param(debug, int, 0644); +#endif |