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Save and restore the high FP registers in {g|s}_mcontext(). Note

Browse source 
that we currently do not keep track of whether the thread has
actually used the high FP registers before. If not, we should
not save them in the context which automaticly means that we
also would not restore them from the context. For now, do it
unconditionally so that we can reach functional completeness.
This commit is contained in:
Marcel Moolenaar 2003-11-11 09:53:37 +00:00
parent 9d52656a5a
commit a5ba2b5cc4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=122480
1 changed files with 9 additions and 2 deletions
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11
sys/ia64/ia64/machdep.c
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@ -1085,7 +1085,13 @@ get_mcontext(struct thread *td, mcontext_t *mc, int flags)
mc->mc_flags |= _MC_FLAGS_ASYNC_CONTEXT;
mc->mc_scratch = tf->tf_scratch;
mc->mc_scratch_fp = tf->tf_scratch_fp;
/* XXX High FP */
/*
* XXX If the thread never used the high FP registers, we
* probably shouldn't waste time saving them.
*/
ia64_highfp_save(td);
mc->mc_flags |= _MC_FLAGS_HIGHFP_VALID;
mc->mc_high_fp = td->td_pcb->pcb_high_fp;
}
save_callee_saved(&mc->mc_preserved);
save_callee_saved_fp(&mc->mc_preserved_fp);
@ -1126,7 +1132,8 @@ set_mcontext(struct thread *td, const mcontext_t *mc)
KASSERT(tf->tf_scratch.gr15 == SYS_sigreturn, ("foo"));
tf->tf_scratch = mc->mc_scratch;
tf->tf_scratch_fp = mc->mc_scratch_fp;
/* XXX High FP */
if (mc->mc_flags & _MC_FLAGS_HIGHFP_VALID)
td->td_pcb->pcb_high_fp = mc->mc_high_fp;
} else {
KASSERT((tf->tf_flags & FRAME_SYSCALL) != 0, ("foo"));
if ((mc->mc_flags & _MC_FLAGS_SCRATCH_VALID) == 0) {