Blackfin: add preliminary support for STACKTRACE (c7b412f4) · Commits · e / devices / android_kernel_xiaomi_markw

arch/blackfin/Kconfig

+3 −0

Original line number	Diff line number	Diff line
		@@ -55,6 +55,9 @@ config FORCE_MAX_ZONEORDER
		config GENERIC_CALIBRATE_DELAY
		def_bool y

		config STACKTRACE_SUPPORT
		def_bool y

		config TRACE_IRQFLAGS_SUPPORT
		def_bool y

+1 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,7 @@ obj-$(CONFIG_MODULES) += module.o
		obj-$(CONFIG_KGDB) += kgdb.o
		obj-$(CONFIG_KGDB_TESTS) += kgdb_test.o
		obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
		obj-$(CONFIG_STACKTRACE) += stacktrace.o

		# the kgdb test puts code into L2 and without linker
		# relaxation, we need to force long calls to/from it

0 → 100644

+53 −0

Original line number	Diff line number	Diff line
		/*
		* Blackfin stacktrace code (mostly copied from avr32)
		*
		* Copyright 2009 Analog Devices Inc.
		* Licensed under the GPL-2 or later.
		*/

		#include <linux/sched.h>
		#include <linux/stacktrace.h>
		#include <linux/thread_info.h>
		#include <linux/module.h>

		register unsigned long current_frame_pointer asm("FP");

		struct stackframe {
		unsigned long fp;
		unsigned long rets;
		};

		/*
		* Save stack-backtrace addresses into a stack_trace buffer.
		*/
		void save_stack_trace(struct stack_trace *trace)
		{
		unsigned long low, high;
		unsigned long fp;
		struct stackframe *frame;
		int skip = trace->skip;

		low = (unsigned long)task_stack_page(current);
		high = low + THREAD_SIZE;
		fp = current_frame_pointer;

		while (fp >= low && fp <= (high - sizeof(*frame))) {
		frame = (struct stackframe *)fp;

		if (skip) {
		skip--;
		} else {
		trace->entries[trace->nr_entries++] = frame->rets;
		if (trace->nr_entries >= trace->max_entries)
		break;
		}

		/*
		* The next frame must be at a higher address than the
		* current frame.
		*/
		low = fp + sizeof(*frame);
		fp = frame->fp;
		}
		}
		EXPORT_SYMBOL_GPL(save_stack_trace);