Commit 6ad2b84c authored by Mike Frysinger's avatar Mike Frysinger Committed by Bryan Wu
Browse files

Blackfin arch: add an option to allow people to stick exception stack into L1 scratch 



allow people to stick exception stack into L1 scratch
and make sure it gets placed into .bss sections rather than .data

Signed-off-by: default avatarMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
parent fe8015ce

arch/blackfin/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -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"

arch/blackfin/mach-common/entry.S

+15 −6
Original line number Diff line number Diff line
@@ -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