Optimize riscv's cpu_fetch_syscall_args(), making it possible
for the compiler to inline the memcpy. Reviewed by: arichardson, mhorne MFC after: 2 weeks Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D26528
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4658877815
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=366392
@ -96,30 +96,31 @@ int
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cpu_fetch_syscall_args(struct thread *td)
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cpu_fetch_syscall_args(struct thread *td)
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{
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{
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struct proc *p;
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struct proc *p;
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register_t *ap;
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register_t *ap, *dst_ap;
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struct syscall_args *sa;
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struct syscall_args *sa;
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int nap;
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nap = NARGREG;
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p = td->td_proc;
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p = td->td_proc;
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sa = &td->td_sa;
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sa = &td->td_sa;
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ap = &td->td_frame->tf_a[0];
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ap = &td->td_frame->tf_a[0];
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dst_ap = &sa->args[0];
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sa->code = td->td_frame->tf_t[0];
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sa->code = td->td_frame->tf_t[0];
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if (sa->code == SYS_syscall || sa->code == SYS___syscall) {
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if (__predict_false(sa->code == SYS_syscall || sa->code == SYS___syscall)) {
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sa->code = *ap++;
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sa->code = *ap++;
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nap--;
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} else {
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*dst_ap++ = *ap++;
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}
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}
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if (sa->code >= p->p_sysent->sv_size)
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if (__predict_false(sa->code >= p->p_sysent->sv_size))
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sa->callp = &p->p_sysent->sv_table[0];
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sa->callp = &p->p_sysent->sv_table[0];
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else
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else
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sa->callp = &p->p_sysent->sv_table[sa->code];
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sa->callp = &p->p_sysent->sv_table[sa->code];
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memcpy(sa->args, ap, nap * sizeof(register_t));
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KASSERT(sa->callp->sy_narg <= nitems(sa->args),
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if (sa->callp->sy_narg > nap)
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("Syscall %d takes too many arguments", sa->code));
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panic("TODO: Could we have more then %d args?", NARGREG);
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memcpy(dst_ap, ap, (NARGREG - 1) * sizeof(register_t));
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td->td_retval[0] = 0;
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td->td_retval[0] = 0;
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td->td_retval[1] = 0;
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td->td_retval[1] = 0;
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