powerpc: move ppc64/kernel/signal.c to arch/powerpc

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

2 files changed, 0 insertions, 582 deletions

diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile
index 74892ad032b..430cb3900a0 100644
--- a/arch/ppc64/kernel/Makefile
+++ b/arch/ppc64/kernel/Makefile
@@ -12,7 +12,6 @@ obj-y               :=	misc.o prom.o
 endif
 
 obj-y               +=	irq.o idle.o dma.o \
-			signal.o \
 			align.o pacaData.o \
 			udbg.o ioctl32.o \
 			rtc.o \
diff --git a/arch/ppc64/kernel/signal.c b/arch/ppc64/kernel/signal.c
deleted file mode 100644
index ec9d0984b6a..00000000000
--- a/arch/ppc64/kernel/signal.c
+++ /dev/null
@@ -1,581 +0,0 @@
-/*
- *  linux/arch/ppc64/kernel/signal.c
- *
- *  PowerPC version 
- *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
- *
- *  Derived from "arch/i386/kernel/signal.c"
- *    Copyright (C) 1991, 1992 Linus Torvalds
- *    1997-11-28  Modified for POSIX.1b signals by Richard Henderson
- *
- *  This program is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version
- *  2 of the License, or (at your option) any later version.
- */
-
-#include <linux/config.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/smp_lock.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/errno.h>
-#include <linux/wait.h>
-#include <linux/unistd.h>
-#include <linux/stddef.h>
-#include <linux/elf.h>
-#include <linux/ptrace.h>
-#include <linux/module.h>
-
-#include <asm/sigcontext.h>
-#include <asm/ucontext.h>
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/ppcdebug.h>
-#include <asm/unistd.h>
-#include <asm/cacheflush.h>
-#include <asm/vdso.h>
-
-#define DEBUG_SIG 0
-
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
-#define GP_REGS_SIZE	min(sizeof(elf_gregset_t), sizeof(struct pt_regs))
-#define FP_REGS_SIZE	sizeof(elf_fpregset_t)
-
-#define TRAMP_TRACEBACK	3
-#define TRAMP_SIZE	6
-
-/*
- * When we have signals to deliver, we set up on the user stack,
- * going down from the original stack pointer:
- *	1) a rt_sigframe struct which contains the ucontext	
- *	2) a gap of __SIGNAL_FRAMESIZE bytes which acts as a dummy caller
- *	   frame for the signal handler.
- */
-
-struct rt_sigframe {
-	/* sys_rt_sigreturn requires the ucontext be the first field */
-	struct ucontext uc;
-	unsigned long _unused[2];
-	unsigned int tramp[TRAMP_SIZE];
-	struct siginfo *pinfo;
-	void *puc;
-	struct siginfo info;
-	/* 64 bit ABI allows for 288 bytes below sp before decrementing it. */
-	char abigap[288];
-} __attribute__ ((aligned (16)));
-
-
-/*
- * Atomically swap in the new signal mask, and wait for a signal.
- */
-long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, int p3, int p4,
-		       int p6, int p7, struct pt_regs *regs)
-{
-	sigset_t saveset, newset;
-
-	/* XXX: Don't preclude handling different sized sigset_t's.  */
-	if (sigsetsize != sizeof(sigset_t))
-		return -EINVAL;
-
-	if (copy_from_user(&newset, unewset, sizeof(newset)))
-		return -EFAULT;
-	sigdelsetmask(&newset, ~_BLOCKABLE);
-
-	spin_lock_irq(&current->sighand->siglock);
-	saveset = current->blocked;
-	current->blocked = newset;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-
-	regs->result = -EINTR;
-	regs->gpr[3] = EINTR;
-	regs->ccr |= 0x10000000;
-	while (1) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule();
-		if (do_signal(&saveset, regs))
-			return 0;
-	}
-}
-
-long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, unsigned long r5,
-		     unsigned long r6, unsigned long r7, unsigned long r8,
-		     struct pt_regs *regs)
-{
-	return do_sigaltstack(uss, uoss, regs->gpr[1]);
-}
-
-
-/*
- * Set up the sigcontext for the signal frame.
- */
-
-static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
-		 int signr, sigset_t *set, unsigned long handler)
-{
-	/* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
-	 * process never used altivec yet (MSR_VEC is zero in pt_regs of
-	 * the context). This is very important because we must ensure we
-	 * don't lose the VRSAVE content that may have been set prior to
-	 * the process doing its first vector operation
-	 * Userland shall check AT_HWCAP to know wether it can rely on the
-	 * v_regs pointer or not
-	 */
-#ifdef CONFIG_ALTIVEC
-	elf_vrreg_t __user *v_regs = (elf_vrreg_t __user *)(((unsigned long)sc->vmx_reserve + 15) & ~0xful);
-#endif
-	long err = 0;
-
-	flush_fp_to_thread(current);
-
-	/* Make sure signal doesn't get spurrious FP exceptions */
-	current->thread.fpscr.val = 0;
-
-#ifdef CONFIG_ALTIVEC
-	err |= __put_user(v_regs, &sc->v_regs);
-
-	/* save altivec registers */
-	if (current->thread.used_vr) {
-		flush_altivec_to_thread(current);
-		/* Copy 33 vec registers (vr0..31 and vscr) to the stack */
-		err |= __copy_to_user(v_regs, current->thread.vr, 33 * sizeof(vector128));
-		/* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
-		 * contains valid data.
-		 */
-		regs->msr |= MSR_VEC;
-	}
-	/* We always copy to/from vrsave, it's 0 if we don't have or don't
-	 * use altivec.
-	 */
-	err |= __put_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
-#else /* CONFIG_ALTIVEC */
-	err |= __put_user(0, &sc->v_regs);
-#endif /* CONFIG_ALTIVEC */
-	err |= __put_user(&sc->gp_regs, &sc->regs);
-	err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
-	err |= __copy_to_user(&sc->fp_regs, &current->thread.fpr, FP_REGS_SIZE);
-	err |= __put_user(signr, &sc->signal);
-	err |= __put_user(handler, &sc->handler);
-	if (set != NULL)
-		err |=  __put_user(set->sig[0], &sc->oldmask);
-
-	return err;
-}
-
-/*
- * Restore the sigcontext from the signal frame.
- */
-
-static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
-			      struct sigcontext __user *sc)
-{
-#ifdef CONFIG_ALTIVEC
-	elf_vrreg_t __user *v_regs;
-#endif
-	unsigned long err = 0;
-	unsigned long save_r13 = 0;
-	elf_greg_t *gregs = (elf_greg_t *)regs;
-#ifdef CONFIG_ALTIVEC
-	unsigned long msr;
-#endif
-	int i;
-
-	/* If this is not a signal return, we preserve the TLS in r13 */
-	if (!sig)
-		save_r13 = regs->gpr[13];
-
-	/* copy everything before MSR */
-	err |= __copy_from_user(regs, &sc->gp_regs,
-				PT_MSR*sizeof(unsigned long));
-
-	/* skip MSR and SOFTE */
-	for (i = PT_MSR+1; i <= PT_RESULT; i++) {
-		if (i == PT_SOFTE)
-			continue;
-		err |= __get_user(gregs[i], &sc->gp_regs[i]);
-	}
-
-	if (!sig)
-		regs->gpr[13] = save_r13;
-	err |= __copy_from_user(&current->thread.fpr, &sc->fp_regs, FP_REGS_SIZE);
-	if (set != NULL)
-		err |=  __get_user(set->sig[0], &sc->oldmask);
-
-#ifdef CONFIG_ALTIVEC
-	err |= __get_user(v_regs, &sc->v_regs);
-	err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
-	if (err)
-		return err;
-	/* Copy 33 vec registers (vr0..31 and vscr) from the stack */
-	if (v_regs != 0 && (msr & MSR_VEC) != 0)
-		err |= __copy_from_user(current->thread.vr, v_regs,
-					33 * sizeof(vector128));
-	else if (current->thread.used_vr)
-		memset(current->thread.vr, 0, 33 * sizeof(vector128));
-	/* Always get VRSAVE back */
-	if (v_regs != 0)
-		err |= __get_user(current->thread.vrsave, (u32 __user *)&v_regs[33]);
-	else
-		current->thread.vrsave = 0;
-#endif /* CONFIG_ALTIVEC */
-
-#ifndef CONFIG_SMP
-	preempt_disable();
-	if (last_task_used_math == current)
-		last_task_used_math = NULL;
-	if (last_task_used_altivec == current)
-		last_task_used_altivec = NULL;
-	preempt_enable();
-#endif
-	/* Force reload of FP/VEC */
-	regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC);
-
-	return err;
-}
-
-/*
- * Allocate space for the signal frame
- */
-static inline void __user * get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
-				  size_t frame_size)
-{
-        unsigned long newsp;
-
-        /* Default to using normal stack */
-        newsp = regs->gpr[1];
-
-	if (ka->sa.sa_flags & SA_ONSTACK) {
-		if (! on_sig_stack(regs->gpr[1]))
-			newsp = (current->sas_ss_sp + current->sas_ss_size);
-	}
-
-        return (void __user *)((newsp - frame_size) & -16ul);
-}
-
-/*
- * Setup the trampoline code on the stack
- */
-static long setup_trampoline(unsigned int syscall, unsigned int __user *tramp)
-{
-	int i;
-	long err = 0;
-
-	/* addi r1, r1, __SIGNAL_FRAMESIZE  # Pop the dummy stackframe */
-	err |= __put_user(0x38210000UL | (__SIGNAL_FRAMESIZE & 0xffff), &tramp[0]);
-	/* li r0, __NR_[rt_]sigreturn| */
-	err |= __put_user(0x38000000UL | (syscall & 0xffff), &tramp[1]);
-	/* sc */
-	err |= __put_user(0x44000002UL, &tramp[2]);
-
-	/* Minimal traceback info */
-	for (i=TRAMP_TRACEBACK; i < TRAMP_SIZE ;i++)
-		err |= __put_user(0, &tramp[i]);
-
-	if (!err)
-		flush_icache_range((unsigned long) &tramp[0],
-			   (unsigned long) &tramp[TRAMP_SIZE]);
-
-	return err;
-}
-
-/*
- * Restore the user process's signal mask (also used by signal32.c)
- */
-void restore_sigmask(sigset_t *set)
-{
-	sigdelsetmask(set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = *set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-}
-
-
-/*
- * Handle {get,set,swap}_context operations
- */
-int sys_swapcontext(struct ucontext __user *old_ctx,
-		    struct ucontext __user *new_ctx,
-		    long ctx_size, long r6, long r7, long r8, struct pt_regs *regs)
-{
-	unsigned char tmp;
-	sigset_t set;
-
-	/* Context size is for future use. Right now, we only make sure
-	 * we are passed something we understand
-	 */
-	if (ctx_size < sizeof(struct ucontext))
-		return -EINVAL;
-
-	if (old_ctx != NULL) {
-		if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
-		    || setup_sigcontext(&old_ctx->uc_mcontext, regs, 0, NULL, 0)
-		    || __copy_to_user(&old_ctx->uc_sigmask,
-				      &current->blocked, sizeof(sigset_t)))
-			return -EFAULT;
-	}
-	if (new_ctx == NULL)
-		return 0;
-	if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx))
-	    || __get_user(tmp, (u8 __user *) new_ctx)
-	    || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1))
-		return -EFAULT;
-
-	/*
-	 * If we get a fault copying the context into the kernel's
-	 * image of the user's registers, we can't just return -EFAULT
-	 * because the user's registers will be corrupted.  For instance
-	 * the NIP value may have been updated but not some of the
-	 * other registers.  Given that we have done the access_ok
-	 * and successfully read the first and last bytes of the region
-	 * above, this should only happen in an out-of-memory situation
-	 * or if another thread unmaps the region containing the context.
-	 * We kill the task with a SIGSEGV in this situation.
-	 */
-
-	if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set)))
-		do_exit(SIGSEGV);
-	restore_sigmask(&set);
-	if (restore_sigcontext(regs, NULL, 0, &new_ctx->uc_mcontext))
-		do_exit(SIGSEGV);
-
-	/* This returns like rt_sigreturn */
-	return 0;
-}
-
-
-/*
- * Do a signal return; undo the signal stack.
- */
-
-int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
-		     unsigned long r6, unsigned long r7, unsigned long r8,
-		     struct pt_regs *regs)
-{
-	struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
-	sigset_t set;
-
-	/* Always make any pending restarted system calls return -EINTR */
-	current_thread_info()->restart_block.fn = do_no_restart_syscall;
-
-	if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
-		goto badframe;
-
-	if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
-		goto badframe;
-	restore_sigmask(&set);
-	if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
-		goto badframe;
-
-	/* do_sigaltstack expects a __user pointer and won't modify
-	 * what's in there anyway
-	 */
-	do_sigaltstack(&uc->uc_stack, NULL, regs->gpr[1]);
-
-	return regs->result;
-
-badframe:
-#if DEBUG_SIG
-	printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
-	       regs, uc, &uc->uc_mcontext);
-#endif
-	force_sig(SIGSEGV, current);
-	return 0;
-}
-
-static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info,
-		sigset_t *set, struct pt_regs *regs)
-{
-	/* Handler is *really* a pointer to the function descriptor for
-	 * the signal routine.  The first entry in the function
-	 * descriptor is the entry address of signal and the second
-	 * entry is the TOC value we need to use.
-	 */
-	func_descr_t __user *funct_desc_ptr;
-	struct rt_sigframe __user *frame;
-	unsigned long newsp = 0;
-	long err = 0;
-
-	frame = get_sigframe(ka, regs, sizeof(*frame));
-
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		goto badframe;
-
-	err |= __put_user(&frame->info, &frame->pinfo);
-	err |= __put_user(&frame->uc, &frame->puc);
-	err |= copy_siginfo_to_user(&frame->info, info);
-	if (err)
-		goto badframe;
-
-	/* Create the ucontext.  */
-	err |= __put_user(0, &frame->uc.uc_flags);
-	err |= __put_user(0, &frame->uc.uc_link);
-	err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
-	err |= __put_user(sas_ss_flags(regs->gpr[1]),
-			  &frame->uc.uc_stack.ss_flags);
-	err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
-	err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, signr, NULL,
-				(unsigned long)ka->sa.sa_handler);
-	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-	if (err)
-		goto badframe;
-
-	/* Set up to return from userspace. */
-	if (vdso64_rt_sigtramp && current->thread.vdso_base) {
-		regs->link = current->thread.vdso_base + vdso64_rt_sigtramp;
-	} else {
-		err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
-		if (err)
-			goto badframe;
-		regs->link = (unsigned long) &frame->tramp[0];
-	}
-	funct_desc_ptr = (func_descr_t __user *) ka->sa.sa_handler;
-
-	/* Allocate a dummy caller frame for the signal handler. */
-	newsp = (unsigned long)frame - __SIGNAL_FRAMESIZE;
-	err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
-
-	/* Set up "regs" so we "return" to the signal handler. */
-	err |= get_user(regs->nip, &funct_desc_ptr->entry);
-	regs->gpr[1] = newsp;
-	err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
-	regs->gpr[3] = signr;
-	regs->result = 0;
-	if (ka->sa.sa_flags & SA_SIGINFO) {
-		err |= get_user(regs->gpr[4], (unsigned long __user *)&frame->pinfo);
-		err |= get_user(regs->gpr[5], (unsigned long __user *)&frame->puc);
-		regs->gpr[6] = (unsigned long) frame;
-	} else {
-		regs->gpr[4] = (unsigned long)&frame->uc.uc_mcontext;
-	}
-	if (err)
-		goto badframe;
-
-	if (test_thread_flag(TIF_SINGLESTEP))
-		ptrace_notify(SIGTRAP);
-
-	return 1;
-
-badframe:
-#if DEBUG_SIG
-	printk("badframe in setup_rt_frame, regs=%p frame=%p newsp=%lx\n",
-	       regs, frame, newsp);
-#endif
-	force_sigsegv(signr, current);
-	return 0;
-}
-
-
-/*
- * OK, we're invoking a handler
- */
-static int handle_signal(unsigned long sig, struct k_sigaction *ka,
-			 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
-{
-	int ret;
-
-	/* Set up Signal Frame */
-	ret = setup_rt_frame(sig, ka, info, oldset, regs);
-
-	if (ret) {
-		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 inline void syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
-{
-	switch ((int)regs->result) {
-	case -ERESTART_RESTARTBLOCK:
-	case -ERESTARTNOHAND:
-		/* ERESTARTNOHAND means that the syscall should only be
-		 * restarted if there was no handler for the signal, and since
-		 * we only get here if there is a handler, we dont restart.
-		 */
-		regs->result = -EINTR;
-		break;
-	case -ERESTARTSYS:
-		/* ERESTARTSYS means to restart the syscall if there is no
-		 * handler or the handler was registered with SA_RESTART
-		 */
-		if (!(ka->sa.sa_flags & SA_RESTART)) {
-			regs->result = -EINTR;
-			break;
-		}
-		/* fallthrough */
-	case -ERESTARTNOINTR:
-		/* ERESTARTNOINTR means that the syscall should be
-		 * called again after the signal handler returns.
-		 */
-		regs->gpr[3] = regs->orig_gpr3;
-		regs->nip -= 4;
-		regs->result = 0;
-		break;
-	}
-}
-
-/*
- * Note that 'init' is a special process: it doesn't get signals it doesn't
- * want to handle. Thus you cannot kill init even with a SIGKILL even by
- * mistake.
- */
-int do_signal(sigset_t *oldset, struct pt_regs *regs)
-{
-	siginfo_t info;
-	int signr;
-	struct k_sigaction ka;
-
-	/*
-	 * If the current thread is 32 bit - invoke the
-	 * 32 bit signal handling code
-	 */
-	if (test_thread_flag(TIF_32BIT))
-		return do_signal32(oldset, regs);
-
-	if (!oldset)
-		oldset = &current->blocked;
-
-	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
-	if (signr > 0) {
-		/* Whee!  Actually deliver the signal.  */
-		if (TRAP(regs) == 0x0C00)
-			syscall_restart(regs, &ka);
-
-		/*
-		 * Reenable the DABR before delivering the signal to
-		 * user space. The DABR will have been cleared if it
-		 * triggered inside the kernel.
-		 */
-		if (current->thread.dabr)
-			set_dabr(current->thread.dabr);
-
-		return handle_signal(signr, &ka, &info, oldset, regs);
-	}
-
-	if (TRAP(regs) == 0x0C00) {	/* System Call! */
-		if ((int)regs->result == -ERESTARTNOHAND ||
-		    (int)regs->result == -ERESTARTSYS ||
-		    (int)regs->result == -ERESTARTNOINTR) {
-			regs->gpr[3] = regs->orig_gpr3;
-			regs->nip -= 4; /* Back up & retry system call */
-			regs->result = 0;
-		} else if ((int)regs->result == -ERESTART_RESTARTBLOCK) {
-			regs->gpr[0] = __NR_restart_syscall;
-			regs->nip -= 4;
-			regs->result = 0;
-		}
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL(do_signal);