diff options
| author | Roland McGrath <roland@gnu.org> | 1999-05-24 20:48:23 +0000 |
|---|---|---|
| committer | Roland McGrath <roland@gnu.org> | 1999-05-24 20:48:23 +0000 |
| commit | 384cbd6c552b851db2759badc36530b11f9698d9 (patch) | |
| tree | acd2e93af70d24cd3aab45f8b4f8e1d36b5fac14 | |
| parent | d999fe3e06322be3fd0eb014cb22c9666e48d317 (diff) | |
1999-05-24 Mark Kettenis <kettenis@gnu.org>
* i386/i386/fpu.c (fp_free): Clear task switch flag before calling
fwait.
(fpu_get_state): Only save FPU state info if the live FPU state
belongs to our target, i.e. if THREAD is the current thread.
(fp_load): Print warning if we try to load an invalid FPU state,
and reset the FPU to some sane state instead.
| -rw-r--r-- | i386/i386/fpu.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/i386/i386/fpu.c b/i386/i386/fpu.c index dc49a6a..c5d15a6 100644 --- a/i386/i386/fpu.c +++ b/i386/i386/fpu.c @@ -179,6 +179,7 @@ ASSERT_IPL(SPL0); * Make sure we don't get FPU interrupts later for * this thread */ + clear_ts(); fwait(); /* Mark it free and disable access */ @@ -215,6 +216,7 @@ ASSERT_IPL(SPL0); * FPU state. */ if (fp_thread == thread) { + clear_ts(); fwait(); /* wait for possible interrupt */ clear_fpu(); /* no state in FPU */ } @@ -345,9 +347,17 @@ ASSERT_IPL(SPL0); } /* Make sure we`ve got the latest fp state info */ - clear_ts(); - fp_save(thread); - clear_fpu(); + /* If the live fpu state belongs to our target */ +#if NCPUS == 1 + if (thread == fp_thread) +#else + if (thread == current_thread()) +#endif + { + clear_ts(); + fp_save(thread); + clear_fpu(); + } state->fpkind = fp_kind; state->exc_status = 0; @@ -652,6 +662,9 @@ ASSERT_IPL(SPL0); thread->pcb->ims.ifps->fp_save_state.fp_status); /*NOTREACHED*/ #endif + } else if (! ifps->fp_valid) { + printf("fp_load: invalid FPU state!\n"); + fninit (); } else { frstor(ifps->fp_save_state); } |