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authorMichal Simek <monstr@monstr.eu>2010-08-03 11:45:08 +0200
committerMichal Simek <monstr@monstr.eu>2010-08-04 10:45:17 +0200
commit2d5973cb5ac5d04662f86e19a06a4c52fa4c4ae3 (patch)
tree21ddc58eed5ccad856fc44dfb0ee794da41d5b16 /arch/microblaze/mm
parent751f1605e03533a6279ccf456e938e9595c7d888 (diff)
downloadvexpress-lsk-2d5973cb5ac5d04662f86e19a06a4c52fa4c4ae3.tar.gz
microblaze: Add KGDB support
Kgdb uses brki r16, 0x18 instruction to call low level _debug_exception function which save current state to pt_regs and call microblaze_kgdb_break function. _debug_exception should be called only from the kernel space. User space calling is not supported because user application debugging uses different handling. pt_regs_to_gdb_regs loads additional special registers which can't be changed * Enable KGDB in Kconfig * Remove ancient not-tested KGDB support * Remove ancient _debug_exception code from entry.S Only MMU KGDB support is supported. Signed-off-by: Michal Simek <monstr@monstr.eu> CC: Jason Wessel <jason.wessel@windriver.com> CC: John Williams <john.williams@petalogix.com> CC: Edgar E. Iglesias <edgar.iglesias@petalogix.com> CC: linux-kernel@vger.kernel.org Acked-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'arch/microblaze/mm')
-rw-r--r--arch/microblaze/mm/fault.c15
1 files changed, 0 insertions, 15 deletions
diff --git a/arch/microblaze/mm/fault.c b/arch/microblaze/mm/fault.c
index b224c650a18..57bd2a09610 100644
--- a/arch/microblaze/mm/fault.c
+++ b/arch/microblaze/mm/fault.c
@@ -37,10 +37,6 @@
#include <linux/uaccess.h>
#include <asm/exceptions.h>
-#if defined(CONFIG_KGDB)
-int debugger_kernel_faults = 1;
-#endif
-
static unsigned long pte_misses; /* updated by do_page_fault() */
static unsigned long pte_errors; /* updated by do_page_fault() */
@@ -81,10 +77,6 @@ void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig)
}
/* kernel has accessed a bad area */
-#if defined(CONFIG_KGDB)
- if (debugger_kernel_faults)
- debugger(regs);
-#endif
die("kernel access of bad area", regs, sig);
}
@@ -115,13 +107,6 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
if ((error_code & 0x13) == 0x13 || (error_code & 0x11) == 0x11)
is_write = 0;
-#if defined(CONFIG_KGDB)
- if (debugger_fault_handler && regs->trap == 0x300) {
- debugger_fault_handler(regs);
- return;
- }
-#endif /* CONFIG_KGDB */
-
if (unlikely(in_atomic() || !mm)) {
if (kernel_mode(regs))
goto bad_area_nosemaphore;