Add realtek target files

Signed-off-by: Roman Yeryomin <roman@advem.lv>

1 files changed, 550 insertions, 0 deletions

diff --git a/target/linux/realtek/files/arch/rlx/kernel/signal.c b/target/linux/realtek/files/arch/rlx/kernel/signal.c
new file mode 100644
index 000000000..93aca32a3
--- /dev/null
+++ b/target/linux/realtek/files/arch/rlx/kernel/signal.c
@@ -0,0 +1,550 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1991, 1992  Linus Torvalds
+ * Copyright (C) 1994 - 2000  Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ */
+#include <linux/cache.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/personality.h>
+#include <linux/smp.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/compiler.h>
+#include <linux/syscalls.h>
+#include <linux/uaccess.h>
+
+#include <asm/abi.h>
+#include <asm/asm.h>
+#include <linux/bitops.h>
+#include <asm/cacheflush.h>
+#include <asm/sim.h>
+#include <asm/ucontext.h>
+#include <asm/cpu-features.h>
+
+#include "signal-common.h"
+
+/*
+ * Horribly complicated - with the bloody RM9000 workarounds enabled
+ * the signal trampolines is moving to the end of the structure so we can
+ * increase the alignment without breaking software compatibility.
+ */
+struct sigframe {
+	u32 sf_ass[4];		/* argument save space for o32 */
+	u32 sf_code[2];		/* signal trampoline */
+	struct sigcontext sf_sc;
+	sigset_t sf_mask;
+};
+
+struct rt_sigframe {
+	u32 rs_ass[4];		/* argument save space for o32 */
+	u32 rs_code[2];		/* signal trampoline */
+	struct siginfo rs_info;
+	struct ucontext rs_uc;
+};
+
+/*
+ * Helper routines
+ */
+int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+	int err = 0;
+	int i;
+
+	err |= __put_user(0, &sc->sc_regs[0]);
+	for (i = 1; i < 32; i++)
+		err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
+
+	err |= __put_user(regs->hi, &sc->sc_mdhi);
+	err |= __put_user(regs->lo, &sc->sc_mdlo);
+	err |= __put_user(regs->cp0_epc, &sc->sc_pc);
+
+	return err;
+}
+
+int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
+{
+	int err = 0;
+	int i;
+
+	/* Always make any pending restarted system calls return -EINTR */
+	current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+	err |= __get_user(regs->cp0_epc, &sc->sc_pc);
+	err |= __get_user(regs->lo, &sc->sc_mdlo);
+	err |= __get_user(regs->hi, &sc->sc_mdhi);
+
+	for (i = 1; i < 32; i++)
+		err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
+
+	return err;
+}
+
+void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
+			  size_t frame_size)
+{
+	unsigned long sp;
+
+	/* Default to using normal stack */
+	sp = regs->regs[29];
+
+	/*
+	 * FPU emulator may have it's own trampoline active just
+	 * above the user stack, 16-bytes before the next lowest
+	 * 16 byte boundary.  Try to avoid trashing it.
+	 */
+	sp -= 32;
+
+	/* This is the X/Open sanctioned signal stack switching.  */
+	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) & ALMASK);
+}
+
+int install_sigtramp(unsigned int __user *tramp, unsigned int syscall)
+{
+	int err;
+
+	/*
+	 * Set up the return code ...
+	 *
+	 *         li      v0, __NR__foo_sigreturn
+	 *         syscall
+	 */
+
+	err = __put_user(0x24020000 + syscall, tramp + 0);
+	err |= __put_user(0x0000000c         , tramp + 1);
+
+	flush_cache_sigtramp((unsigned long) tramp);
+
+	return err;
+}
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+
+#ifdef CONFIG_TRAD_SIGNALS
+asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
+{
+	sigset_t newset;
+	sigset_t __user *uset;
+
+	uset = (sigset_t __user *) regs.regs[4];
+	if (copy_from_user(&newset, uset, sizeof(sigset_t)))
+		return -EFAULT;
+	sigdelsetmask(&newset, ~_BLOCKABLE);
+
+	spin_lock_irq(&current->sighand->siglock);
+	current->saved_sigmask = current->blocked;
+	current->blocked = newset;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+
+	current->state = TASK_INTERRUPTIBLE;
+	schedule();
+	set_thread_flag(TIF_RESTORE_SIGMASK);
+	return -ERESTARTNOHAND;
+}
+#endif
+
+asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
+{
+	sigset_t newset;
+	sigset_t __user *unewset;
+	size_t sigsetsize;
+
+	/* XXX Don't preclude handling different sized sigset_t's.  */
+	sigsetsize = regs.regs[5];
+	if (sigsetsize != sizeof(sigset_t))
+		return -EINVAL;
+
+	unewset = (sigset_t __user *) regs.regs[4];
+	if (copy_from_user(&newset, unewset, sizeof(newset)))
+		return -EFAULT;
+	sigdelsetmask(&newset, ~_BLOCKABLE);
+
+	spin_lock_irq(&current->sighand->siglock);
+	current->saved_sigmask = current->blocked;
+	current->blocked = newset;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+
+	current->state = TASK_INTERRUPTIBLE;
+	schedule();
+	set_thread_flag(TIF_RESTORE_SIGMASK);
+	return -ERESTARTNOHAND;
+}
+
+#ifdef CONFIG_TRAD_SIGNALS
+SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
+	struct sigaction __user *, oact)
+{
+	struct k_sigaction new_ka, old_ka;
+	int ret;
+	int err = 0;
+
+	if (act) {
+		old_sigset_t mask;
+
+		if (!access_ok(VERIFY_READ, act, sizeof(*act)))
+			return -EFAULT;
+		err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
+		err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
+		err |= __get_user(mask, &act->sa_mask.sig[0]);
+		if (err)
+			return -EFAULT;
+
+		siginitset(&new_ka.sa.sa_mask, mask);
+	}
+
+	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+	if (!ret && oact) {
+		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
+			return -EFAULT;
+		err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
+		err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
+		err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
+		err |= __put_user(0, &oact->sa_mask.sig[1]);
+		err |= __put_user(0, &oact->sa_mask.sig[2]);
+		err |= __put_user(0, &oact->sa_mask.sig[3]);
+		if (err)
+			return -EFAULT;
+	}
+
+	return ret;
+}
+#endif
+
+asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
+{
+	const stack_t __user *uss = (const stack_t __user *) regs.regs[4];
+	stack_t __user *uoss = (stack_t __user *) regs.regs[5];
+	unsigned long usp = regs.regs[29];
+
+	return do_sigaltstack(uss, uoss, usp);
+}
+
+#ifdef CONFIG_TRAD_SIGNALS
+asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs)
+{
+	struct sigframe __user *frame;
+	sigset_t blocked;
+	int sig;
+
+	frame = (struct sigframe __user *) regs.regs[29];
+	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+		goto badframe;
+	if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
+		goto badframe;
+
+	sigdelsetmask(&blocked, ~_BLOCKABLE);
+	spin_lock_irq(&current->sighand->siglock);
+	current->blocked = blocked;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+
+	sig = restore_sigcontext(&regs, &frame->sf_sc);
+	if (sig < 0)
+		goto badframe;
+	else if (sig)
+		force_sig(sig, current);
+
+	/*
+	 * Don't let your children do this ...
+	 */
+	__asm__ __volatile__(
+		"move\t$29, %0\n\t"
+		"j\tsyscall_exit"
+		:/* no outputs */
+		:"r" (&regs));
+	/* Unreached */
+
+badframe:
+	force_sig(SIGSEGV, current);
+}
+#endif /* CONFIG_TRAD_SIGNALS */
+
+asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
+{
+	struct rt_sigframe __user *frame;
+	sigset_t set;
+	stack_t st;
+	int sig;
+
+	frame = (struct rt_sigframe __user *) regs.regs[29];
+	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+		goto badframe;
+	if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
+		goto badframe;
+
+	sigdelsetmask(&set, ~_BLOCKABLE);
+	spin_lock_irq(&current->sighand->siglock);
+	current->blocked = set;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+
+	sig = restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext);
+	if (sig < 0)
+		goto badframe;
+	else if (sig)
+		force_sig(sig, current);
+
+	if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
+		goto badframe;
+	/* It is more difficult to avoid calling this function than to
+	   call it and ignore errors.  */
+	do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
+
+	/*
+	 * Don't let your children do this ...
+	 */
+	__asm__ __volatile__(
+		"move\t$29, %0\n\t"
+		"j\tsyscall_exit"
+		:/* no outputs */
+		:"r" (&regs));
+	/* Unreached */
+
+badframe:
+	force_sig(SIGSEGV, current);
+}
+
+#ifdef CONFIG_TRAD_SIGNALS
+static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
+	int signr, sigset_t *set)
+{
+	struct sigframe __user *frame;
+	int err = 0;
+
+	frame = get_sigframe(ka, regs, sizeof(*frame));
+	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
+		goto give_sigsegv;
+
+	err |= install_sigtramp(frame->sf_code, __NR_sigreturn);
+
+	err |= setup_sigcontext(regs, &frame->sf_sc);
+	err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
+	if (err)
+		goto give_sigsegv;
+
+	/*
+	 * Arguments to signal handler:
+	 *
+	 *   a0 = signal number
+	 *   a1 = 0 (should be cause)
+	 *   a2 = pointer to struct sigcontext
+	 *
+	 * $25 and c0_epc point to the signal handler, $29 points to the
+	 * struct sigframe.
+	 */
+	regs->regs[ 4] = signr;
+	regs->regs[ 5] = 0;
+	regs->regs[ 6] = (unsigned long) &frame->sf_sc;
+	regs->regs[29] = (unsigned long) frame;
+	regs->regs[31] = (unsigned long) frame->sf_code;
+	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
+
+	DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
+	       current->comm, current->pid,
+	       frame, regs->cp0_epc, regs->regs[31]);
+	return 0;
+
+give_sigsegv:
+	force_sigsegv(signr, current);
+	return -EFAULT;
+}
+#endif
+
+static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
+	int signr, sigset_t *set, siginfo_t *info)
+{
+	struct rt_sigframe __user *frame;
+	int err = 0;
+
+	frame = get_sigframe(ka, regs, sizeof(*frame));
+	if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
+		goto give_sigsegv;
+
+	err |= install_sigtramp(frame->rs_code, __NR_rt_sigreturn);
+
+	/* Create siginfo.  */
+	err |= copy_siginfo_to_user(&frame->rs_info, info);
+
+	/* Create the ucontext.  */
+	err |= __put_user(0, &frame->rs_uc.uc_flags);
+	err |= __put_user(NULL, &frame->rs_uc.uc_link);
+	err |= __put_user((void __user *)current->sas_ss_sp,
+	                  &frame->rs_uc.uc_stack.ss_sp);
+	err |= __put_user(sas_ss_flags(regs->regs[29]),
+	                  &frame->rs_uc.uc_stack.ss_flags);
+	err |= __put_user(current->sas_ss_size,
+	                  &frame->rs_uc.uc_stack.ss_size);
+	err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
+	err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
+
+	if (err)
+		goto give_sigsegv;
+
+	/*
+	 * Arguments to signal handler:
+	 *
+	 *   a0 = signal number
+	 *   a1 = 0 (should be cause)
+	 *   a2 = pointer to ucontext
+	 *
+	 * $25 and c0_epc point to the signal handler, $29 points to
+	 * the struct rt_sigframe.
+	 */
+	regs->regs[ 4] = signr;
+	regs->regs[ 5] = (unsigned long) &frame->rs_info;
+	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
+	regs->regs[29] = (unsigned long) frame;
+	regs->regs[31] = (unsigned long) frame->rs_code;
+	regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
+
+	DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
+	       current->comm, current->pid,
+	       frame, regs->cp0_epc, regs->regs[31]);
+
+	return 0;
+
+give_sigsegv:
+	force_sigsegv(signr, current);
+	return -EFAULT;
+}
+
+struct mips_abi mips_abi = {
+#ifdef CONFIG_TRAD_SIGNALS
+	.setup_frame	= setup_frame,
+#endif
+	.setup_rt_frame	= setup_rt_frame,
+	.restart	= __NR_restart_syscall
+};
+
+static int handle_signal(unsigned long sig, siginfo_t *info,
+	struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
+{
+	int ret;
+
+	switch(regs->regs[0]) {
+	case ERESTART_RESTARTBLOCK:
+	case ERESTARTNOHAND:
+		regs->regs[2] = EINTR;
+		break;
+	case ERESTARTSYS:
+		if (!(ka->sa.sa_flags & SA_RESTART)) {
+			regs->regs[2] = EINTR;
+			break;
+		}
+	/* fallthrough */
+	case ERESTARTNOINTR:		/* Userland will reload $v0.  */
+		regs->regs[7] = regs->regs[26];
+		regs->cp0_epc -= 8;
+	}
+
+	regs->regs[0] = 0;		/* Don't deal with this again.  */
+
+	if (sig_uses_siginfo(ka))
+		ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
+	else
+		ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);
+
+	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 ret;
+}
+
+static void do_signal(struct pt_regs *regs)
+{
+	struct k_sigaction ka;
+	sigset_t *oldset;
+	siginfo_t info;
+	int signr;
+
+	/*
+	 * We want the common case to go fast, which is why we may in certain
+	 * cases get here from kernel mode. Just return without doing anything
+	 * if so.
+	 */
+	if (!user_mode(regs))
+		return;
+
+	if (test_thread_flag(TIF_RESTORE_SIGMASK))
+		oldset = &current->saved_sigmask;
+	else
+		oldset = &current->blocked;
+
+	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+	if (signr > 0) {
+		/* Whee!  Actually deliver the signal.  */
+		if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
+			/*
+			 * A signal was successfully delivered; the saved
+			 * sigmask will have been stored in the signal frame,
+			 * and will be restored by sigreturn, so we can simply
+			 * clear the TIF_RESTORE_SIGMASK flag.
+			 */
+			if (test_thread_flag(TIF_RESTORE_SIGMASK))
+				clear_thread_flag(TIF_RESTORE_SIGMASK);
+		}
+
+		return;
+	}
+
+	/*
+	 * Who's code doesn't conform to the restartable syscall convention
+	 * dies here!!!  The li instruction, a single machine instruction,
+	 * must directly be followed by the syscall instruction.
+	 */
+	if (regs->regs[0]) {
+		if (regs->regs[2] == ERESTARTNOHAND ||
+		    regs->regs[2] == ERESTARTSYS ||
+		    regs->regs[2] == ERESTARTNOINTR) {
+			regs->regs[7] = regs->regs[26];
+			regs->cp0_epc -= 8;
+		}
+		if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
+			regs->regs[2] = current->thread.abi->restart;
+			regs->regs[7] = regs->regs[26];
+			regs->cp0_epc -= 4;
+		}
+		regs->regs[0] = 0;	/* Don't deal with this again.  */
+	}
+
+	/*
+	 * If there's no signal to deliver, we just 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);
+	}
+}
+
+/*
+ * notification of userspace execution resumption
+ * - triggered by the TIF_WORK_MASK flags
+ */
+asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
+	__u32 thread_info_flags)
+{
+	/* deal with pending signal delivery */
+	if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+		do_signal(regs);
+}