From: Eli Cooper <elicooper@gmx.com>
Date: Sat, 19 Mar 2016 16:58:39 +0000 (+0800)
Subject: um: fix FPU state preservation around signal handlers
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6de5a8a5001687df720b36729c799991cc0faff5;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

um: fix FPU state preservation around signal handlers

This patch makes UML saves/restores FPU state from/to the fpstate in
pt_regs when setting up or returning from a signal stack, rather than
calling ptrace directly. This ensures that FPU state is correctly
preserved around signal handlers in a multi-threaded scenario.

Signed-off-by: Eli Cooper <elicooper@gmx.com>
---

diff --git a/arch/x86/um/signal.c b/arch/x86/um/signal.c
index 14fcd01ed992..dac23ee4e5a1 100644
--- a/arch/x86/um/signal.c
+++ b/arch/x86/um/signal.c
@@ -225,20 +225,10 @@ static int copy_sc_from_user(struct pt_regs *regs,
 	} else
 #endif
 	{
-		struct user_i387_struct fp;
-
-		err = copy_from_user(&fp, (void *)sc.fpstate,
+		err = copy_from_user(regs->regs.fp, (void *)sc.fpstate,
 				     sizeof(struct user_i387_struct));
 		if (err)
 			return 1;
-
-		err = restore_fp_registers(pid, (unsigned long *) &fp);
-		if (err < 0) {
-			printk(KERN_ERR "copy_sc_from_user - "
-			       "restore_fp_registers failed, errno = %d\n",
-			       -err);
-			return 1;
-		}
 	}
 	return 0;
 }
@@ -325,10 +315,8 @@ static int copy_sc_to_user(struct sigcontext __user *to,
 	} else
 #endif
 	{
-		struct user_i387_struct fp;
-
-		err = save_fp_registers(pid, (unsigned long *) &fp);
-		if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
+		if (copy_to_user(to_fp, regs->regs.fp,
+				 sizeof(struct user_i387_struct)))
 			return 1;
 	}