diff options
Diffstat (limited to 'arch/sparc64/kernel/process.c')
| -rw-r--r-- | arch/sparc64/kernel/process.c | 46 |
1 files changed, 37 insertions, 9 deletions
diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c index 593c1efc6..cc8183618 100644 --- a/arch/sparc64/kernel/process.c +++ b/arch/sparc64/kernel/process.c @@ -1,4 +1,4 @@ -/* $Id: process.c,v 1.12 1997/05/23 09:35:43 jj Exp $ +/* $Id: process.c,v 1.17 1997/06/02 06:33:32 davem Exp $ * arch/sparc64/kernel/process.c * * Copyright (C) 1995, 1996 David S. Miller (davem@caip.rutgers.edu) @@ -317,6 +317,13 @@ void exit_thread(void) #else if(current->flags & PF_USEDFPU) { #endif + fprs_write(FPRS_FEF); + if(current->tss.flags & SPARC_FLAG_32BIT) + fpsave32((unsigned long *)¤t->tss.float_regs[0], + ¤t->tss.fsr); + else + fpsave((unsigned long *)¤t->tss.float_regs[0], + ¤t->tss.fsr); #ifndef __SMP__ last_task_used_math = NULL; #else @@ -338,6 +345,13 @@ void flush_thread(void) #else if(current->flags & PF_USEDFPU) { #endif + fprs_write(FPRS_FEF); + if(current->tss.flags & SPARC_FLAG_32BIT) + fpsave32((unsigned long *)¤t->tss.float_regs[0], + ¤t->tss.fsr); + else + fpsave((unsigned long *)¤t->tss.float_regs[0], + ¤t->tss.fsr); #ifndef __SMP__ last_task_used_math = NULL; #else @@ -424,6 +438,8 @@ clone_stackframe(struct sparc_stackf *dst, struct sparc_stackf *src) return sp; } +/* #define DEBUG_WINFIXUPS */ + /* Standard stuff. */ static inline void shift_window_buffer(int first_win, int last_win, struct thread_struct *tp) @@ -440,12 +456,15 @@ static inline void shift_window_buffer(int first_win, int last_win, void synchronize_user_stack(void) { struct thread_struct *tp = ¤t->tss; - unsigned long window = tp->w_saved; + unsigned long window; flush_user_windows(); - if(window) { + if((window = tp->w_saved) != 0) { int winsize = REGWIN_SZ; +#ifdef DEBUG_WINFIXUPS + printk("sus(%d", (int)window); +#endif if(tp->flags & SPARC_FLAG_32BIT) winsize = REGWIN32_SZ; @@ -459,18 +478,26 @@ void synchronize_user_stack(void) tp->w_saved--; } } while(window--); +#ifdef DEBUG_WINFIXUPS + printk(")"); +#endif } } void fault_in_user_windows(struct pt_regs *regs) { struct thread_struct *tp = ¤t->tss; - unsigned long window = tp->w_saved; + unsigned long window; int winsize = REGWIN_SZ; if(tp->flags & SPARC_FLAG_32BIT) winsize = REGWIN32_SZ; - if(window) { + flush_user_windows(); + window = tp->w_saved; +#ifdef DEBUG_WINFIXUPS + printk("fiuw(%d", (int)window); +#endif + if(window != 0) { window -= 1; do { unsigned long sp = tp->rwbuf_stkptrs[window]; @@ -481,6 +508,9 @@ void fault_in_user_windows(struct pt_regs *regs) } while(window--); } current->tss.w_saved = 0; +#ifdef DEBUG_WINFIXUPS + printk(")"); +#endif } /* Copy a Sparc thread. The fork() return value conventions @@ -504,19 +534,17 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, struct reg_window *new_stack, *old_stack; unsigned long stack_offset; -#if 0 #ifndef __SMP__ if(last_task_used_math == current) { #else if(current->flags & PF_USEDFPU) { #endif - put_psr(get_psr() | PSR_EF); - fpsave(&p->tss.float_regs[0], &p->tss.fsr); + fprs_write(FPRS_FEF); + fpsave((unsigned long *)&p->tss.float_regs[0], &p->tss.fsr); #ifdef __SMP__ current->flags &= ~PF_USEDFPU; #endif } -#endif /* Calculate offset to stack_frame & pt_regs */ stack_offset = ((PAGE_SIZE<<1) - TRACEREG_SZ); |