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// SPDX-License-Identifier: GPL-2.0-only
/*
* Signal support for Hexagon processor
*
* Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
*/
#include <linux/linkage.h>
#include <linux/syscalls.h>
#include <linux/sched/task_stack.h>
#include <asm/registers.h>
#include <asm/thread_info.h>
#include <asm/unistd.h>
#include <linux/uaccess.h>
#include <asm/ucontext.h>
#include <asm/cacheflush.h>
#include <asm/signal.h>
#include <asm/vdso.h>
struct rt_sigframe {
unsigned long tramp[2];
struct siginfo info;
struct ucontext uc;
};
static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
size_t frame_size)
{
unsigned long sp = sigsp(regs->r29, ksig);
return (void __user *)((sp - frame_size) & ~(sizeof(long long) - 1));
}
static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
{
unsigned long tmp;
int err = 0;
err |= copy_to_user(&sc->sc_regs.r0, ®s->r00,
32*sizeof(unsigned long));
err |= __put_user(regs->sa0, &sc->sc_regs.sa0);
err |= __put_user(regs->lc0, &sc->sc_regs.lc0);
err |= __put_user(regs->sa1, &sc->sc_regs.sa1);
err |= __put_user(regs->lc1, &sc->sc_regs.lc1);
err |= __put_user(regs->m0, &sc->sc_regs.m0);
err |= __put_user(regs->m1, &sc->sc_regs.m1);
err |= __put_user(regs->usr, &sc->sc_regs.usr);
err |= __put_user(regs->preds, &sc->sc_regs.p3_0);
err |= __put_user(regs->gp, &sc->sc_regs.gp);
err |= __put_user(regs->ugp, &sc->sc_regs.ugp);
#if CONFIG_HEXAGON_ARCH_VERSION >= 4
err |= __put_user(regs->cs0, &sc->sc_regs.cs0);
err |= __put_user(regs->cs1, &sc->sc_regs.cs1);
#endif
tmp = pt_elr(regs); err |= __put_user(tmp, &sc->sc_regs.pc);
tmp = pt_cause(regs); err |= __put_user(tmp, &sc->sc_regs.cause);
tmp = pt_badva(regs); err |= __put_user(tmp, &sc->sc_regs.badva);
return err;
}
static int restore_sigcontext(struct pt_regs *regs,
struct sigcontext __user *sc)
{
unsigned long tmp;
int err = 0;
err |= copy_from_user(®s->r00, &sc->sc_regs.r0,
32 * sizeof(unsigned long));
err |= __get_user(regs->sa0, &sc->sc_regs.sa0);
err |= __get_user(regs->lc0, &sc->sc_regs.lc0);
err |= __get_user(regs->sa1, &sc->sc_regs.sa1);
err |= __get_user(regs->lc1, &sc->sc_regs.lc1);
err |= __get_user(regs->m0, &sc->sc_regs.m0);
err |= __get_user(regs->m1, &sc->sc_regs.m1);
err |= __get_user(regs->usr, &sc->sc_regs.usr);
err |= __get_user(regs->preds, &sc->sc_regs.p3_0);
err |= __get_user(regs->gp, &sc->sc_regs.gp);
err |= __get_user(regs->ugp, &sc->sc_regs.ugp);
#if CONFIG_HEXAGON_ARCH_VERSION >= 4
err |= __get_user(regs->cs0, &sc->sc_regs.cs0);
err |= __get_user(regs->cs1, &sc->sc_regs.cs1);
#endif
err |= __get_user(tmp, &sc->sc_regs.pc); pt_set_elr(regs, tmp);
return err;
}
/*
* Setup signal stack frame with siginfo structure
*/
static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
struct pt_regs *regs)
{
int err = 0;
struct rt_sigframe __user *frame;
struct hexagon_vdso *vdso = current->mm->context.vdso;
frame = get_sigframe(ksig, regs, sizeof(struct rt_sigframe));
if (!access_ok(frame, sizeof(struct rt_sigframe)))
return -EFAULT;
if (copy_siginfo_to_user(&frame->info, &ksig->info))
return -EFAULT;
/* The on-stack signal trampoline is no longer executed;
* however, the libgcc signal frame unwinding code checks for
* the presence of these two numeric magic values.
*/
err |= __put_user(0x7800d166, &frame->tramp[0]);
err |= __put_user(0x5400c004, &frame->tramp[1]);
err |= setup_sigcontext(regs, &frame->uc.uc_mcontext);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
err |= __save_altstack(&frame->uc.uc_stack, user_stack_pointer(regs));
if (err)
return -EFAULT;
/* Load r0/r1 pair with signumber/siginfo pointer... */
regs->r0100 = ((unsigned long long)((unsigned long)&frame->info) << 32)
| (unsigned long long)ksig->sig;
regs->r02 = (unsigned long) &frame->uc;
regs->r31 = (unsigned long) vdso->rt_signal_trampoline;
pt_psp(regs) = (unsigned long) frame;
pt_set_elr(regs, (unsigned long)ksig->ka.sa.sa_handler);
return 0;
}
/*
* Setup invocation of signal handler
*/
static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
int ret;
/*
* If we're handling a signal that aborted a system call,
* set up the error return value before adding the signal
* frame to the stack.
*/
if (regs->syscall_nr >= 0) {
switch (regs->r00) {
case -ERESTART_RESTARTBLOCK:
case -ERESTARTNOHAND:
regs->r00 = -EINTR;
break;
case -ERESTARTSYS:
if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
regs->r00 = -EINTR;
break;
}
fallthrough;
case -ERESTARTNOINTR:
regs->r06 = regs->syscall_nr;
pt_set_elr(regs, pt_elr(regs) - 4);
regs->r00 = regs->restart_r0;
break;
default:
break;
}
}
/*
* Set up the stack frame; not doing the SA_SIGINFO thing. We
* only set up the rt_frame flavor.
*/
/* If there was an error on setup, no signal was delivered. */
ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
}
/*
* Called from return-from-event code.
*/
void do_signal(struct pt_regs *regs)
{
struct ksignal ksig;
if (!user_mode(regs))
return;
if (get_signal(&ksig)) {
handle_signal(&ksig, regs);
return;
}
/*
* No (more) signals; if we came from a system call, handle the restart.
*/
if (regs->syscall_nr >= 0) {
switch (regs->r00) {
case -ERESTARTNOHAND:
case -ERESTARTSYS:
case -ERESTARTNOINTR:
regs->r06 = regs->syscall_nr;
break;
case -ERESTART_RESTARTBLOCK:
regs->r06 = __NR_restart_syscall;
break;
default:
goto no_restart;
}
pt_set_elr(regs, pt_elr(regs) - 4);
regs->r00 = regs->restart_r0;
}
no_restart:
/* If there's no signal to deliver, put the saved sigmask back */
restore_saved_sigmask();
}
/*
* Architecture-specific wrappers for signal-related system calls
*/
SYSCALL_DEFINE0(rt_sigreturn)
{
struct pt_regs *regs = current_pt_regs();
struct rt_sigframe __user *frame;
sigset_t blocked;
/* Always make any pending restarted system calls return -EINTR */
current->restart_block.fn = do_no_restart_syscall;
frame = (struct rt_sigframe __user *)pt_psp(regs);
if (!access_ok(frame, sizeof(*frame)))
goto badframe;
if (__copy_from_user(&blocked, &frame->uc.uc_sigmask, sizeof(blocked)))
goto badframe;
set_current_blocked(&blocked);
if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
goto badframe;
/* Restore the user's stack as well */
pt_psp(regs) = regs->r29;
regs->syscall_nr = -1;
if (restore_altstack(&frame->uc.uc_stack))
goto badframe;
return regs->r00;
badframe:
force_sig(SIGSEGV);
return 0;
}
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