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authorBernd Schmidt <bernds_cb1@t-online.de>2008-05-07 07:41:26 +0400
committerBryan Wu <cooloney@kernel.org>2008-05-07 07:41:26 +0400
commit0893f1250f87e0a832f47bb60fb69ed0d52be7a3 (patch)
tree96dbea09cc618f4e6c4db2a671de215ba6b9784b /include/asm-blackfin
parent8513c42edb3f1c91a8418fae11846c87cf7b8581 (diff)
downloadlinux-0893f1250f87e0a832f47bb60fb69ed0d52be7a3.tar.xz
[Blackfin] arch: fix gdb testing regression
When transferring to IRQ5 from an exception, save SYSCFG in memory across the transfer and clear the trace bit. When we get a single step exception, check whether we can safely clear the trace bit in SYSCFG. We can (and should) clear it after the first instruction of the interrupt handler; the first insn saves SYSCFG to the stack in all handlers. Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de> Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'include/asm-blackfin')
-rw-r--r--include/asm-blackfin/entry.h5
-rw-r--r--include/asm-blackfin/mach-common/context.S5
2 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-blackfin/entry.h b/include/asm-blackfin/entry.h
index 562c6d3a3232..c4f721e0d00d 100644
--- a/include/asm-blackfin/entry.h
+++ b/include/asm-blackfin/entry.h
@@ -17,6 +17,11 @@
#define PF_DTRACE_OFF 1
#define PF_DTRACE_BIT 5
+/*
+ * NOTE! The single-stepping code assumes that all interrupt handlers
+ * start by saving SYSCFG on the stack with their first instruction.
+ */
+
/* This one is used for exceptions, emulation, and NMI. It doesn't push
RETI and doesn't do cli. */
#define SAVE_ALL_SYS save_context_no_interrupts
diff --git a/include/asm-blackfin/mach-common/context.S b/include/asm-blackfin/mach-common/context.S
index fd0ebe1862b8..c0e630edfb9a 100644
--- a/include/asm-blackfin/mach-common/context.S
+++ b/include/asm-blackfin/mach-common/context.S
@@ -28,6 +28,11 @@
*/
/*
+ * NOTE! The single-stepping code assumes that all interrupt handlers
+ * start by saving SYSCFG on the stack with their first instruction.
+ */
+
+/*
* Code to save processor context.
* We even save the register which are preserved by a function call
* - r4, r5, r6, r7, p3, p4, p5