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Subject[patch v2 14/35] Hexagon: Add signal functions
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Linas Vepstas <linas@codeaurora.org>

---
arch/hexagon/include/asm/sigcontext.h | 32 +++
arch/hexagon/include/asm/signal.h | 26 ++
arch/hexagon/kernel/signal.c | 325 ++++++++++++++++++++++++++++++++++
arch/hexagon/kernel/trampoline.S | 35 +++
4 files changed, 418 insertions(+)
Index: linux-hexagon-kernel/arch/hexagon/include/asm/sigcontext.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-hexagon-kernel/arch/hexagon/include/asm/sigcontext.h 2011-08-24 18:45:48.193877157 -0500
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2010-2011, Code Aurora Forum. 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.
+ */
+
+#ifndef _ASM_SIGCONTEXT_H
+#define _ASM_SIGCONTEXT_H
+
+#include <asm/registers.h>
+
+/*
+ * Signal context structure - contains all info to do with the state
+ * before the signal handler was invoked.
+ */
+struct sigcontext {
+ struct pt_regs sc_regs;
+};
+
+#endif
Index: linux-hexagon-kernel/arch/hexagon/include/asm/signal.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-hexagon-kernel/arch/hexagon/include/asm/signal.h 2011-08-24 18:45:48.193877157 -0500
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2010-2011, Code Aurora Forum. 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.
+ */
+
+#ifndef _ASM_SIGNAL_H
+#define _ASM_SIGNAL_H
+
+extern unsigned long __rt_sigtramp_template[2];
+
+#include <asm-generic/signal.h>
+
+#endif
Index: linux-hexagon-kernel/arch/hexagon/kernel/signal.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-hexagon-kernel/arch/hexagon/kernel/signal.c 2011-08-24 18:45:48.193877157 -0500
@@ -0,0 +1,325 @@
+/*
+ * Signal support for Hexagon processor
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. 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/freezer.h>
+#include <asm/registers.h>
+#include <asm/thread_info.h>
+#include <asm/unistd.h>
+#include <asm/uaccess.h>
+#include <asm/ucontext.h>
+#include <asm/cacheflush.h>
+#include <asm/signal.h>
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+struct sigframe {
+ unsigned long tramp[2];
+ struct sigcontext sc;
+ sigset_t mask;
+};
+
+struct rt_sigframe {
+ unsigned long tramp[2];
+ struct siginfo info;
+ struct ucontext uc;
+};
+
+static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
+ size_t frame_size)
+{
+ unsigned long sp = regs->r29;
+
+ /* 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;
+
+ return (void __user *)((sp - frame_size) & ~(sizeof(long long) - 1));
+}
+
+static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+ int err = 0;
+
+ /*
+ * Need to revisit if we're leaking anything inappropriate to user
+ * stack.
+ */
+
+ err |= copy_to_user(&sc->sc_regs, regs, sizeof(struct pt_regs));
+ return err;
+}
+
+static int restore_sigcontext(struct pt_regs *regs,
+ struct sigcontext __user *sc)
+{
+ int err = 0;
+
+ /*
+ * Should only restore vmel in case user stack is corrupted,
+ * bogus status shouldn't be used in the rte.
+ */
+
+ err |= copy_from_user(regs, &sc->sc_regs,
+ offsetof(struct pt_regs, hvmer.vmel)
+ + sizeof(unsigned long));
+ return err;
+}
+
+/*
+ * 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)
+{
+ int err = 0;
+ struct rt_sigframe __user *frame;
+
+ frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe));
+
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(struct rt_sigframe)))
+ goto sigsegv;
+
+ if (copy_siginfo_to_user(&frame->info, info))
+ goto sigsegv;
+
+ err |= __put_user(__rt_sigtramp_template[0], &frame->tramp[0]);
+ err |= __put_user(__rt_sigtramp_template[1], &frame->tramp[1]);
+ flush_dcache_range((unsigned long)&frame->tramp[0],
+ (unsigned long)&frame->tramp[2]);
+ flush_icache_range((unsigned long)&frame->tramp[0],
+ (unsigned long)&frame->tramp[2]);
+ mb();
+
+ err |= setup_sigcontext(regs, &frame->uc.uc_mcontext);
+ err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+ if (err)
+ goto sigsegv;
+
+ /* Load r0/r1 pair with signumber/siginfo pointer... */
+ regs->r0100 = ((unsigned long long)((unsigned long)&frame->info) << 32)
+ | (unsigned long long)signr;
+ regs->r02 = (unsigned long) &frame->uc;
+ regs->r31 = (unsigned long) frame->tramp;
+ pt_psp(regs) = (unsigned long) frame;
+ pt_set_elr(regs, (unsigned long)ka->sa.sa_handler);
+
+ return 0;
+
+sigsegv:
+ force_sigsegv(signr, current);
+ return -EFAULT;
+}
+
+/*
+ * Setup invocation of signal handler
+ */
+static int handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
+ sigset_t *oldset, struct pt_regs *regs)
+{
+ int rc;
+
+ /*
+ * 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 (!(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.
+ */
+ rc = setup_rt_frame(sig, ka, info, oldset, regs);
+
+ /* If there was an error on setup, no signal was delivered. */
+ if (rc)
+ return rc;
+
+ spin_lock_irq(&current->sighand->siglock);
+ sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
+ if (!(ka->sa.sa_flags & SA_NODEFER))
+ sigaddset(&current->blocked, sig);
+ recalc_sigpending();
+ spin_unlock_irq(&current->sighand->siglock);
+
+ return 0;
+}
+
+/*
+ * Called from return-from-event code.
+ */
+static void do_signal(struct pt_regs *regs)
+{
+ struct k_sigaction sigact;
+ siginfo_t info;
+ int signo;
+
+ if (!user_mode(regs))
+ return;
+
+ if (try_to_freeze())
+ goto no_signal;
+
+ signo = get_signal_to_deliver(&info, &sigact, regs, NULL);
+
+ if (signo > 0) {
+ sigset_t *oldset;
+
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ oldset = &current->saved_sigmask;
+ else
+ oldset = &current->blocked;
+
+ if (handle_signal(signo, &info, &sigact, oldset, regs) == 0) {
+ /*
+ * Successful delivery case. The saved sigmask is
+ * stored in the signal frame, and will be restored
+ * by sigreturn. We can clear the TIF flag.
+ */
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
+ }
+ return;
+ }
+
+no_signal:
+ /*
+ * 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 */
+ if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
+ sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
+ }
+}
+
+void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
+{
+ if (thread_info_flags & _TIF_SIGPENDING)
+ do_signal(regs);
+
+ if (thread_info_flags & _TIF_NOTIFY_RESUME) {
+ clear_thread_flag(TIF_NOTIFY_RESUME);
+ if (current->replacement_session_keyring)
+ key_replace_session_keyring();
+ }
+}
+
+/*
+ * Architecture-specific wrappers for signal-related system calls
+ */
+asmlinkage int sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
+{
+ struct pt_regs *regs = current_thread_info()->regs;
+
+ return do_sigaltstack(uss, uoss, regs->r29);
+}
+
+asmlinkage int sys_rt_sigreturn(void)
+{
+ struct pt_regs *regs = current_thread_info()->regs;
+ struct rt_sigframe __user *frame;
+ sigset_t blocked;
+
+ 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;
+
+ sigdelsetmask(&blocked, ~_BLOCKABLE);
+ spin_lock_irq(&current->sighand->siglock);
+ current->blocked = blocked;
+ recalc_sigpending();
+ spin_unlock_irq(&current->sighand->siglock);
+
+ if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
+ goto badframe;
+
+ /* Restore the user's stack as well */
+ pt_psp(regs) = regs->r29;
+
+ /*
+ * Leave a trace in the stack frame that this was a sigreturn.
+ * If the system call is to replay, we've already restored the
+ * number in the GPR slot and it will be regenerated on the
+ * new system call trap entry. Note that if restore_sigcontext()
+ * did something other than a bulk copy of the pt_regs struct,
+ * we could avoid this assignment by simply not overwriting
+ * regs->syscall_nr.
+ */
+ regs->syscall_nr = __NR_rt_sigreturn;
+
+ /*
+ * If we were meticulous, we'd only call this if we knew that
+ * we were actually going to use an alternate stack, and we'd
+ * consider any error to be fatal. What we do here, in common
+ * with many other architectures, is call it blindly and only
+ * consider the -EFAULT return case to be proof of a problem.
+ */
+ if (do_sigaltstack(&frame->uc.uc_stack, NULL, pt_psp(regs)) == -EFAULT)
+ goto badframe;
+
+ return 0;
+
+badframe:
+ force_sig(SIGSEGV, current);
+ return 0;
+}
Index: linux-hexagon-kernel/arch/hexagon/kernel/trampoline.S
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-hexagon-kernel/arch/hexagon/kernel/trampoline.S 2011-08-24 18:45:48.193877157 -0500
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2010-2011, Code Aurora Forum. 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.
+ */
+
+/*
+ * Trampoline sequences to be copied onto user stack.
+ * This consumes a little more space than hand-assembling
+ * immediate constants for use in C, but is more portable
+ * to future tweaks to the Hexagon instruction set.
+ */
+
+#include <asm/unistd.h>
+
+/* Sig trampolines - call sys_sigreturn or sys_rt_sigreturn as appropriate */
+
+/* plain sigreturn is gone. */
+
+ .globl __rt_sigtramp_template
+__rt_sigtramp_template:
+ r6 = #__NR_rt_sigreturn;
+ trap0(#1);
--

Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.



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