From: Richard Henderson <rth@twiddle.net>
Date: Sun, 2 Oct 2005 19:49:52 +0000 (-0700)
Subject: [PATCH] alpha: fix kernel alignment traps
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d70ddac1bf3a8b102996588010ca87018c3a4a04;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

[PATCH] alpha: fix kernel alignment traps

Pass in the pointer to the on-stack registers rather than using them
directly as the arguments.

Ivan noticed that I missed a spot when purging the registers as first
stack parameter idiom.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
index 76cc0cb5fc2e..e38671c922bc 100644
--- a/arch/alpha/kernel/entry.S
+++ b/arch/alpha/kernel/entry.S
@@ -196,6 +196,7 @@ entUna:
 	stq	$26, 208($sp)
 	stq	$27, 216($sp)
 	stq	$28, 224($sp)
+	mov	$sp, $19
 	stq	$gp, 232($sp)
 	lda	$8, 0x3fff
 	stq	$31, 248($sp)
diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
index 6f509a644bdd..f9d12319e0fb 100644
--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -446,16 +446,15 @@ struct unaligned_stat {
 
 
 /* Macro for exception fixup code to access integer registers.  */
-#define una_reg(r)  (regs.regs[(r) >= 16 && (r) <= 18 ? (r)+19 : (r)])
+#define una_reg(r)  (regs->regs[(r) >= 16 && (r) <= 18 ? (r)+19 : (r)])
 
 
 asmlinkage void
 do_entUna(void * va, unsigned long opcode, unsigned long reg,
-	  unsigned long a3, unsigned long a4, unsigned long a5,
-	  struct allregs regs)
+	  struct allregs *regs)
 {
 	long error, tmp1, tmp2, tmp3, tmp4;
-	unsigned long pc = regs.pc - 4;
+	unsigned long pc = regs->pc - 4;
 	const struct exception_table_entry *fixup;
 
 	unaligned[0].count++;
@@ -636,7 +635,7 @@ got_exception:
 		printk("Forwarding unaligned exception at %lx (%lx)\n",
 		       pc, newpc);
 
-		(&regs)->pc = newpc;
+		regs->pc = newpc;
 		return;
 	}
 
@@ -650,7 +649,7 @@ got_exception:
 	       current->comm, current->pid);
 
 	printk("pc = [<%016lx>]  ra = [<%016lx>]  ps = %04lx\n",
-	       pc, una_reg(26), regs.ps);
+	       pc, una_reg(26), regs->ps);
 	printk("r0 = %016lx  r1 = %016lx  r2 = %016lx\n",
 	       una_reg(0), una_reg(1), una_reg(2));
 	printk("r3 = %016lx  r4 = %016lx  r5 = %016lx\n",
@@ -670,10 +669,10 @@ got_exception:
 	       una_reg(22), una_reg(23), una_reg(24));
 	printk("r25= %016lx  r27= %016lx  r28= %016lx\n",
 	       una_reg(25), una_reg(27), una_reg(28));
-	printk("gp = %016lx  sp = %p\n", regs.gp, &regs+1);
+	printk("gp = %016lx  sp = %p\n", regs->gp, regs+1);
 
 	dik_show_code((unsigned int *)pc);
-	dik_show_trace((unsigned long *)(&regs+1));
+	dik_show_trace((unsigned long *)(regs+1));
 
 	if (test_and_set_thread_flag (TIF_DIE_IF_KERNEL)) {
 		printk("die_if_kernel recursion detected.\n");