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-rw-r--r--arch/hexagon/kernel/signal.c89
1 files changed, 30 insertions, 59 deletions
diff --git a/arch/hexagon/kernel/signal.c b/arch/hexagon/kernel/signal.c
index d7c73874b515..d301f4621553 100644
--- a/arch/hexagon/kernel/signal.c
+++ b/arch/hexagon/kernel/signal.c
@@ -1,30 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* 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 <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <asm/ucontext.h>
#include <asm/cacheflush.h>
#include <asm/signal.h>
@@ -36,18 +24,10 @@ struct rt_sigframe {
struct ucontext uc;
};
-static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
+static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
size_t frame_size)
{
- unsigned long sp = regs->r29;
-
- /* check if we would overflow the alt stack */
- if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
- return (void __user __force *)-1UL;
-
- /* Switch to signal stack if appropriate */
- if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0))
- sp = current->sas_ss_sp + current->sas_ss_size;
+ unsigned long sp = sigsp(regs->r29, ksig);
return (void __user *)((sp - frame_size) & ~(sizeof(long long) - 1));
}
@@ -112,20 +92,20 @@ static int restore_sigcontext(struct pt_regs *regs,
/*
* Setup signal stack frame with siginfo structure
*/
-static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs *regs)
+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(ka, regs, sizeof(struct rt_sigframe));
+ frame = get_sigframe(ksig, regs, sizeof(struct rt_sigframe));
- if (!access_ok(VERIFY_WRITE, frame, sizeof(struct rt_sigframe)))
- goto sigsegv;
+ if (!access_ok(frame, sizeof(struct rt_sigframe)))
+ return -EFAULT;
- if (copy_siginfo_to_user(&frame->info, info))
- goto sigsegv;
+ 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
@@ -137,29 +117,26 @@ static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info,
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
err |= __save_altstack(&frame->uc.uc_stack, user_stack_pointer(regs));
if (err)
- goto sigsegv;
+ return -EFAULT;
/* Load r0/r1 pair with signumber/siginfo pointer... */
regs->r0100 = ((unsigned long long)((unsigned long)&frame->info) << 32)
- | (unsigned long long)signr;
+ | (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)ka->sa.sa_handler);
+ pt_set_elr(regs, (unsigned long)ksig->ka.sa.sa_handler);
return 0;
-
-sigsegv:
- force_sigsegv(signr, current);
- return -EFAULT;
}
/*
* Setup invocation of signal handler
*/
-static void handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
- struct pt_regs *regs)
+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
@@ -173,11 +150,11 @@ static void handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
regs->r00 = -EINTR;
break;
case -ERESTARTSYS:
- if (!(ka->sa.sa_flags & SA_RESTART)) {
+ if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
regs->r00 = -EINTR;
break;
}
- /* Fall through */
+ fallthrough;
case -ERESTARTNOINTR:
regs->r06 = regs->syscall_nr;
pt_set_elr(regs, pt_elr(regs) - 4);
@@ -193,11 +170,9 @@ static void handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
* only set up the rt_frame flavor.
*/
/* If there was an error on setup, no signal was delivered. */
- if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs) < 0)
- return;
+ ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
- signal_delivered(sig, info, ka, regs,
- test_thread_flag(TIF_SINGLESTEP));
+ signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
}
/*
@@ -205,17 +180,13 @@ static void handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
*/
void do_signal(struct pt_regs *regs)
{
- struct k_sigaction sigact;
- siginfo_t info;
- int signo;
+ struct ksignal ksig;
if (!user_mode(regs))
return;
- signo = get_signal_to_deliver(&info, &sigact, regs, NULL);
-
- if (signo > 0) {
- handle_signal(signo, &info, &sigact, regs);
+ if (get_signal(&ksig)) {
+ handle_signal(&ksig, regs);
return;
}
@@ -249,17 +220,17 @@ no_restart:
* Architecture-specific wrappers for signal-related system calls
*/
-asmlinkage int sys_rt_sigreturn(void)
+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_thread_info()->restart_block.fn = do_no_restart_syscall;
+ current->restart_block.fn = do_no_restart_syscall;
frame = (struct rt_sigframe __user *)pt_psp(regs);
- if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+ if (!access_ok(frame, sizeof(*frame)))
goto badframe;
if (__copy_from_user(&blocked, &frame->uc.uc_sigmask, sizeof(blocked)))
goto badframe;
@@ -280,6 +251,6 @@ asmlinkage int sys_rt_sigreturn(void)
return regs->r00;
badframe:
- force_sig(SIGSEGV, current);
+ force_sig(SIGSEGV);
return 0;
}
generated by cgit (git 2.34.1) at 2025-12-25 05:59:34 +0000