From 2d5973cb5ac5d04662f86e19a06a4c52fa4c4ae3 Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Tue, 3 Aug 2010 11:45:08 +0200 Subject: 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 CC: Jason Wessel CC: John Williams CC: Edgar E. Iglesias CC: linux-kernel@vger.kernel.org Acked-by: Jason Wessel --- arch/microblaze/mm/fault.c | 15 --------------- 1 file changed, 15 deletions(-) (limited to 'arch/microblaze/mm') diff --git a/arch/microblaze/mm/fault.c b/arch/microblaze/mm/fault.c index b224c650a18d..57bd2a09610c 100644 --- a/arch/microblaze/mm/fault.c +++ b/arch/microblaze/mm/fault.c @@ -37,10 +37,6 @@ #include #include -#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; -- cgit v1.2.3