a007b1f1c7
This trivial change reduces considerably code size of these 2 functions callers. For instance, here is the figures for arch/kernel/signal.o objects: text data bss dec hex filename 11972 0 0 11972 2ec4 arch/mips/kernel/signal.o~old 5380 0 0 5380 1504 arch/mips/kernel/signal.o~new Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright (C) 1994 - 2000 Ralf Baechle
|
|
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
|
|
*/
|
|
|
|
|
|
static inline int
|
|
setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
|
|
{
|
|
int err = 0;
|
|
int i;
|
|
|
|
err |= __put_user(regs->cp0_epc, &sc->sc_pc);
|
|
|
|
err |= __put_user(0, &sc->sc_regs[0]);
|
|
for (i = 1; i < 32; i++)
|
|
err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
|
|
|
|
err |= __put_user(regs->hi, &sc->sc_mdhi);
|
|
err |= __put_user(regs->lo, &sc->sc_mdlo);
|
|
if (cpu_has_dsp) {
|
|
err |= __put_user(mfhi1(), &sc->sc_hi1);
|
|
err |= __put_user(mflo1(), &sc->sc_lo1);
|
|
err |= __put_user(mfhi2(), &sc->sc_hi2);
|
|
err |= __put_user(mflo2(), &sc->sc_lo2);
|
|
err |= __put_user(mfhi3(), &sc->sc_hi3);
|
|
err |= __put_user(mflo3(), &sc->sc_lo3);
|
|
err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
|
|
}
|
|
|
|
err |= __put_user(!!used_math(), &sc->sc_used_math);
|
|
|
|
if (used_math()) {
|
|
/*
|
|
* Save FPU state to signal context. Signal handler
|
|
* will "inherit" current FPU state.
|
|
*/
|
|
preempt_disable();
|
|
|
|
if (!is_fpu_owner()) {
|
|
own_fpu();
|
|
restore_fp(current);
|
|
}
|
|
err |= save_fp_context(sc);
|
|
|
|
preempt_enable();
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static inline int
|
|
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
|
|
{
|
|
unsigned int used_math;
|
|
unsigned long treg;
|
|
int err = 0;
|
|
int i;
|
|
|
|
/* Always make any pending restarted system calls return -EINTR */
|
|
current_thread_info()->restart_block.fn = do_no_restart_syscall;
|
|
|
|
err |= __get_user(regs->cp0_epc, &sc->sc_pc);
|
|
err |= __get_user(regs->hi, &sc->sc_mdhi);
|
|
err |= __get_user(regs->lo, &sc->sc_mdlo);
|
|
if (cpu_has_dsp) {
|
|
err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
|
|
err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
|
|
err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
|
|
err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
|
|
err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
|
|
err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
|
|
err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
|
|
}
|
|
|
|
for (i = 1; i < 32; i++)
|
|
err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
|
|
|
|
err |= __get_user(used_math, &sc->sc_used_math);
|
|
conditional_used_math(used_math);
|
|
|
|
preempt_disable();
|
|
|
|
if (used_math()) {
|
|
/* restore fpu context if we have used it before */
|
|
own_fpu();
|
|
err |= restore_fp_context(sc);
|
|
} else {
|
|
/* signal handler may have used FPU. Give it up. */
|
|
lose_fpu();
|
|
}
|
|
|
|
preempt_enable();
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Determine which stack to use..
|
|
*/
|
|
static inline void __user *
|
|
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
|
|
{
|
|
unsigned long sp;
|
|
|
|
/* Default to using normal stack */
|
|
sp = regs->regs[29];
|
|
|
|
/*
|
|
* FPU emulator may have it's own trampoline active just
|
|
* above the user stack, 16-bytes before the next lowest
|
|
* 16 byte boundary. Try to avoid trashing it.
|
|
*/
|
|
sp -= 32;
|
|
|
|
/* This is the X/Open sanctioned signal stack switching. */
|
|
if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
|
|
sp = current->sas_ss_sp + current->sas_ss_size;
|
|
|
|
return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
|
|
}
|
|
|
|
static inline int install_sigtramp(unsigned int __user *tramp,
|
|
unsigned int syscall)
|
|
{
|
|
int err;
|
|
|
|
/*
|
|
* Set up the return code ...
|
|
*
|
|
* li v0, __NR__foo_sigreturn
|
|
* syscall
|
|
*/
|
|
|
|
err = __put_user(0x24020000 + syscall, tramp + 0);
|
|
err |= __put_user(0x0000000c , tramp + 1);
|
|
if (ICACHE_REFILLS_WORKAROUND_WAR) {
|
|
err |= __put_user(0, tramp + 2);
|
|
err |= __put_user(0, tramp + 3);
|
|
err |= __put_user(0, tramp + 4);
|
|
err |= __put_user(0, tramp + 5);
|
|
err |= __put_user(0, tramp + 6);
|
|
err |= __put_user(0, tramp + 7);
|
|
}
|
|
flush_cache_sigtramp((unsigned long) tramp);
|
|
|
|
return err;
|
|
}
|