From bcc53d1adb47c183578593c97f3e04a635c5cc55 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier.adi@gmail.com>
Date: Tue, 28 Oct 2008 11:03:09 +0800
Subject: [PATCH] --- yaml --- r: 126991 b: refs/heads/master c:
 6ad2b84cf014d91a9dffa3f8edb008430fbdb445 h: refs/heads/master i:   126989:
 11bc6e09660e4cfe93d0e94597c55b21cba00917   126987:
 eb69f7b3a81af173077d1e9181c85c742c5b4ad5   126983:
 4da3274a1adb39ac0c883c7038e30375196ca995   126975:
 5a5977599e8e4f8e2f284d41f6ae11c492c8faff v: v3

---
 [refs]                                  |  2 +-
 trunk/arch/blackfin/Kconfig             | 11 +++++++++++
 trunk/arch/blackfin/mach-common/entry.S | 21 +++++++++++++++------
 3 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/[refs] b/[refs]
index 5f9bee1055f6..d0e968e91a76 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: fe8015ce2588e3ffe65284a2883703355804276e
+refs/heads/master: 6ad2b84cf014d91a9dffa3f8edb008430fbdb445
diff --git a/trunk/arch/blackfin/Kconfig b/trunk/arch/blackfin/Kconfig
index ac76baac1df3..e37e993431b9 100644
--- a/trunk/arch/blackfin/Kconfig
+++ b/trunk/arch/blackfin/Kconfig
@@ -667,6 +667,17 @@ config APP_STACK_L1
 
 	  Currently only works with FLAT binaries.
 
+config EXCEPTION_L1_SCRATCH
+	bool "Locate exception stack in L1 Scratch Memory"
+	default n
+	depends on !APP_STACK_L1 && !SYSCALL_TAB_L1
+	help
+	  Whenever an exception occurs, use the L1 Scratch memory for
+	  stack storage.  You cannot place the stacks of FLAT binaries
+	  in L1 when using this option.
+
+	  If you don't use L1 Scratch, then you should say Y here.
+
 comment "Speed Optimizations"
 config BFIN_INS_LOWOVERHEAD
 	bool "ins[bwl] low overhead, higher interrupt latency"
diff --git a/trunk/arch/blackfin/mach-common/entry.S b/trunk/arch/blackfin/mach-common/entry.S
index bde6dc4e2614..ad4049882291 100644
--- a/trunk/arch/blackfin/mach-common/entry.S
+++ b/trunk/arch/blackfin/mach-common/entry.S
@@ -1539,14 +1539,23 @@ ENTRY(_sys_call_table)
 	.endr
 END(_sys_call_table)
 
-_exception_stack:
-	.rept 1024
-	.long 0;
-	.endr
-_exception_stack_top:
-
 #if ANOMALY_05000261
 /* Used by the assembly entry point to work around an anomaly.  */
 _last_cplb_fault_retx:
 	.long 0;
 #endif
+
+#ifdef CONFIG_EXCEPTION_L1_SCRATCH
+/* .section .l1.bss.scratch */
+.set _exception_stack_top, L1_SCRATCH_START + L1_SCRATCH_LENGTH
+#else
+#ifdef CONFIG_SYSCALL_TAB_L1
+.section .l1.bss
+#else
+.bss
+#endif
+_exception_stack:
+.size _exception_stack, 1024 * 4
+.set _exception_stack_top, _exception_stack + 1024 * 4
+.size _exception_stack_top, 0
+#endif