mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 18:38:46 +07:00
68db0cf106
We are going to split <linux/sched/task_stack.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/task_stack.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
271 lines
7.3 KiB
C
271 lines
7.3 KiB
C
/*
|
|
* Signal support for Hexagon processor
|
|
*
|
|
* Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 and
|
|
* only version 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/tracehook.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(VERIFY_WRITE, 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;
|
|
}
|
|
/* Fall through */
|
|
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
|
|
*/
|
|
|
|
asmlinkage int sys_rt_sigreturn(void)
|
|
{
|
|
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(VERIFY_READ, 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, current);
|
|
return 0;
|
|
}
|