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Refactor FPU code in signal setup/return procedures

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FPU-related logic is separated from normal signal handling path in
this patch.  Kernel can easily be configured to exclude those procedures
for no-FPU systems.

Signed-off-by: Alan Kao <alankao@andestech.com>
Cc: Greentime Hu <greentime@andestech.com>
Cc: Vincent Chen <vincentc@andestech.com>
Cc: Zong Li <zong@andestech.com>
Cc: Nick Hu <nickhu@andestech.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Alan Kao 2018-10-09 10:18:31 +08:00 committed by Palmer Dabbelt
parent e68ad867f7
commit 007f5c3589
No known key found for this signature in database
GPG Key ID: EF4CA1502CCBAB41
1 changed files with 41 additions and 27 deletions
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68
arch/riscv/kernel/signal.c
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@ -37,45 +37,63 @@ struct rt_sigframe {
struct ucontext uc;
};
static long restore_d_state(struct pt_regs *regs,
struct __riscv_d_ext_state __user *state)
static long restore_fp_state(struct pt_regs *regs,
union __riscv_fp_state *sc_fpregs)
{
long err;
struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
size_t i;
err = __copy_from_user(&current->thread.fstate, state, sizeof(*state));
if (likely(!err))
fstate_restore(current, regs);
if (unlikely(err))
return err;
fstate_restore(current, regs);
/* We support no other extension state at this time. */
for (i = 0; i < ARRAY_SIZE(sc_fpregs->q.reserved); i++) {
u32 value;
err = __get_user(value, &sc_fpregs->q.reserved[i]);
if (unlikely(err))
break;
if (value != 0)
return -EINVAL;
}
return err;
}
static long save_d_state(struct pt_regs *regs,
struct __riscv_d_ext_state __user *state)
static long save_fp_state(struct pt_regs *regs,
union __riscv_fp_state *sc_fpregs)
{
long err;
struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
size_t i;
fstate_save(current, regs);
return __copy_to_user(state, &current->thread.fstate, sizeof(*state));
err = __copy_to_user(state, &current->thread.fstate, sizeof(*state));
if (unlikely(err))
return err;
/* We support no other extension state at this time. */
for (i = 0; i < ARRAY_SIZE(sc_fpregs->q.reserved); i++) {
err = __put_user(0, &sc_fpregs->q.reserved[i]);
if (unlikely(err))
break;
}
return err;
}
static long restore_sigcontext(struct pt_regs *regs,
struct sigcontext __user *sc)
{
long err;
size_t i;
/* sc_regs is structured the same as the start of pt_regs */
err = __copy_from_user(regs, &sc->sc_regs, sizeof(sc->sc_regs));
if (unlikely(err))
return err;
/* Restore the floating-point state. */
err = restore_d_state(regs, &sc->sc_fpregs.d);
if (unlikely(err))
return err;
/* We support no other extension state at this time. */
for (i = 0; i < ARRAY_SIZE(sc->sc_fpregs.q.reserved); i++) {
u32 value;
err = __get_user(value, &sc->sc_fpregs.q.reserved[i]);
if (unlikely(err))
break;
if (value != 0)
return -EINVAL;
}
err |= restore_fp_state(regs, &sc->sc_fpregs);
return err;
}
@ -124,14 +142,10 @@ static long setup_sigcontext(struct rt_sigframe __user *frame,
{
struct sigcontext __user *sc = &frame->uc.uc_mcontext;
long err;
size_t i;
/* sc_regs is structured the same as the start of pt_regs */
err = __copy_to_user(&sc->sc_regs, regs, sizeof(sc->sc_regs));
/* Save the floating-point state. */
err |= save_d_state(regs, &sc->sc_fpregs.d);
/* We support no other extension state at this time. */
for (i = 0; i < ARRAY_SIZE(sc->sc_fpregs.q.reserved); i++)
err |= __put_user(0, &sc->sc_fpregs.q.reserved[i]);
err |= save_fp_state(regs, &sc->sc_fpregs);
return err;
}