[PATCH 2/5] ARM64: Move some signal code to a seperate file to be reused by ILP32.

[Andrew Pinski]

Since the ILP32 ABI uses similar signal code as the LP64 ABI, it makes sense to reuse rather
than copy the same code.


Signed-off-by: Andrew Pinski <apinski at cavium.com>
---
 arch/arm64/kernel/signal.c |  170 +-------------------------------------------
 1 files changed, 1 insertions(+), 169 deletions(-)

diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index 3fbd848..d97a0c0 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -95,176 +95,8 @@ static int restore_fpsimd_context(struct fpsimd_context __user *ctx)
 	return err ? -EFAULT : 0;
 }
 
-static int restore_sigframe(struct pt_regs *regs,
-			    struct rt_sigframe __user *sf)
-{
-	sigset_t set;
-	int i, err;
-	struct aux_context __user *aux =
-		(struct aux_context __user *)sf->uc.uc_mcontext.__reserved;
-
-	err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
-	if (err == 0)
-		set_current_blocked(&set);
-
-	for (i = 0; i < 31; i++)
-		__get_user_error(regs->regs[i], &sf->uc.uc_mcontext.regs[i],
-				 err);
-	__get_user_error(regs->sp, &sf->uc.uc_mcontext.sp, err);
-	__get_user_error(regs->pc, &sf->uc.uc_mcontext.pc, err);
-	__get_user_error(regs->pstate, &sf->uc.uc_mcontext.pstate, err);
-
-	/*
-	 * Avoid sys_rt_sigreturn() restarting.
-	 */
-	regs->syscallno = ~0UL;
-
-	err |= !valid_user_regs(&regs->user_regs);
-
-	if (err == 0)
-		err |= restore_fpsimd_context(&aux->fpsimd);
-
-	return err;
-}
-
-asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
-{
-	struct rt_sigframe __user *frame;
-
-	/* Always make any pending restarted system calls return -EINTR */
-	current_thread_info()->restart_block.fn = do_no_restart_syscall;
-
-	/*
-	 * Since we stacked the signal on a 128-bit boundary, then 'sp' should
-	 * be word aligned here.
-	 */
-	if (regs->sp & 15)
-		goto badframe;
-
-	frame = (struct rt_sigframe __user *)regs->sp;
-
-	if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
-		goto badframe;
-
-	if (restore_sigframe(regs, frame))
-		goto badframe;
-
-	if (restore_altstack(&frame->uc.uc_stack))
-		goto badframe;
-
-	return regs->regs[0];
-
-badframe:
-	if (show_unhandled_signals)
-		pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
-				    current->comm, task_pid_nr(current), __func__,
-				    regs->pc, regs->sp);
-	force_sig(SIGSEGV, current);
-	return 0;
-}
-
-static int setup_sigframe(struct rt_sigframe __user *sf,
-			  struct pt_regs *regs, sigset_t *set)
-{
-	int i, err = 0;
-	struct aux_context __user *aux =
-		(struct aux_context __user *)sf->uc.uc_mcontext.__reserved;
-
-	/* set up the stack frame for unwinding */
-	__put_user_error(regs->regs[29], &sf->fp, err);
-	__put_user_error(regs->regs[30], &sf->lr, err);
-
-	for (i = 0; i < 31; i++)
-		__put_user_error(regs->regs[i], &sf->uc.uc_mcontext.regs[i],
-				 err);
-	__put_user_error(regs->sp, &sf->uc.uc_mcontext.sp, err);
-	__put_user_error(regs->pc, &sf->uc.uc_mcontext.pc, err);
-	__put_user_error(regs->pstate, &sf->uc.uc_mcontext.pstate, err);
-
-	__put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err);
-
-	err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));
-
-	if (err == 0)
-		err |= preserve_fpsimd_context(&aux->fpsimd);
-
-	/* set the "end" magic */
-	__put_user_error(0, &aux->end.magic, err);
-	__put_user_error(0, &aux->end.size, err);
+#include "signal_template.c"
 
-	return err;
-}
-
-static struct rt_sigframe __user *get_sigframe(struct k_sigaction *ka,
-					       struct pt_regs *regs)
-{
-	unsigned long sp, sp_top;
-	struct rt_sigframe __user *frame;
-
-	sp = sp_top = regs->sp;
-
-	/*
-	 * This is the X/Open sanctioned signal stack switching.
-	 */
-	if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
-		sp = sp_top = current->sas_ss_sp + current->sas_ss_size;
-
-	sp = (sp - sizeof(struct rt_sigframe)) & ~15;
-	frame = (struct rt_sigframe __user *)sp;
-
-	/*
-	 * Check that we can actually write to the signal frame.
-	 */
-	if (!access_ok(VERIFY_WRITE, frame, sp_top - sp))
-		frame = NULL;
-
-	return frame;
-}
-
-static void setup_return(struct pt_regs *regs, struct k_sigaction *ka,
-			 void __user *frame, int usig)
-{
-	__sigrestore_t sigtramp;
-
-	regs->regs[0] = usig;
-	regs->sp = (unsigned long)frame;
-	regs->regs[29] = regs->sp + offsetof(struct rt_sigframe, fp);
-	regs->pc = (unsigned long)ka->sa.sa_handler;
-
-	if (ka->sa.sa_flags & SA_RESTORER)
-		sigtramp = ka->sa.sa_restorer;
-	else
-		sigtramp = VDSO_SYMBOL(current->mm->context.vdso, sigtramp);
-
-	regs->regs[30] = (unsigned long)sigtramp;
-}
-
-static int setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
-			  sigset_t *set, struct pt_regs *regs)
-{
-	struct rt_sigframe __user *frame;
-	int err = 0;
-
-	frame = get_sigframe(ka, regs);
-	if (!frame)
-		return 1;
-
-	__put_user_error(0, &frame->uc.uc_flags, err);
-	__put_user_error(NULL, &frame->uc.uc_link, err);
-
-	err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
-	err |= setup_sigframe(frame, regs, set);
-	if (err == 0) {
-		setup_return(regs, ka, frame, usig);
-		if (ka->sa.sa_flags & SA_SIGINFO) {
-			err |= copy_siginfo_to_user(&frame->info, info);
-			regs->regs[1] = (unsigned long)&frame->info;
-			regs->regs[2] = (unsigned long)&frame->uc;
-		}
-	}
-
-	return err;
-}
 
 static void setup_restart_syscall(struct pt_regs *regs)
 {
-- 
1.7.2.5