Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 9960e9e8 authored by David S. Miller's avatar David S. Miller
Browse files

sparc64: Add function graph tracer support. 



Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a71d1d6b

arch/sparc/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -37,6 +37,8 @@ config SPARC64 
	def_bool 64BIT

	select ARCH_SUPPORTS_MSI

	select HAVE_FUNCTION_TRACER

	select HAVE_FUNCTION_GRAPH_TRACER

	select HAVE_FUNCTION_GRAPH_FP_TEST

	select HAVE_FUNCTION_TRACE_MCOUNT_TEST

	select HAVE_KRETPROBES

	select HAVE_KPROBES

arch/sparc/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -93,6 +93,7 @@ obj-$(CONFIG_KGDB) += kgdb_$(BITS).o 




obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o

obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o



obj-$(CONFIG_EARLYFB) += btext.o

obj-$(CONFIG_STACKTRACE)     += stacktrace.o

arch/sparc/kernel/ftrace.c

+58 −0
Original line number Diff line number Diff line
@@ -91,3 +91,61 @@ int __init ftrace_dyn_arch_init(void *data) 
	return 0;

}

#endif



#ifdef CONFIG_FUNCTION_GRAPH_TRACER



#ifdef CONFIG_DYNAMIC_FTRACE

extern void ftrace_graph_call(void);



int ftrace_enable_ftrace_graph_caller(void)

{

	unsigned long ip = (unsigned long)(&ftrace_graph_call);

	u32 old, new;



	old = *(u32 *) &ftrace_graph_call;

	new = ftrace_call_replace(ip, (unsigned long) &ftrace_graph_caller);

	return ftrace_modify_code(ip, old, new);

}



int ftrace_disable_ftrace_graph_caller(void)

{

	unsigned long ip = (unsigned long)(&ftrace_graph_call);

	u32 old, new;



	old = *(u32 *) &ftrace_graph_call;

	new = ftrace_call_replace(ip, (unsigned long) &ftrace_stub);



	return ftrace_modify_code(ip, old, new);

}



#endif /* !CONFIG_DYNAMIC_FTRACE */



/*

 * Hook the return address and push it in the stack of return addrs

 * in current thread info.

 */

unsigned long prepare_ftrace_return(unsigned long parent,

				    unsigned long self_addr,

				    unsigned long frame_pointer)

{

	unsigned long return_hooker = (unsigned long) &return_to_handler;

	struct ftrace_graph_ent trace;



	if (unlikely(atomic_read(&current->tracing_graph_pause)))

		return parent + 8UL;



	if (ftrace_push_return_trace(parent, self_addr, &trace.depth,

				     frame_pointer) == -EBUSY)

		return parent + 8UL;



	trace.func = self_addr;



	/* Only trace if the calling function expects to */

	if (!ftrace_graph_entry(&trace)) {

		current->curr_ret_stack--;

		return parent + 8UL;

	}



	return return_hooker;

}

#endif /* CONFIG_FUNCTION_GRAPH_TRACER */

arch/sparc/kernel/irq_64.c

+2 −1
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/delay.h>

#include <linux/proc_fs.h>

#include <linux/seq_file.h>

#include <linux/ftrace.h>

#include <linux/irq.h>



#include <asm/ptrace.h>
@@ -721,7 +722,7 @@ static __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp) 
	__asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp));

}



void handler_irq(int irq, struct pt_regs *regs)

void __irq_entry handler_irq(int irq, struct pt_regs *regs)

{

	unsigned long pstate, bucket_pa;

	struct pt_regs *old_regs;

arch/sparc/kernel/kgdb_64.c

+2 −1
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 


#include <linux/kgdb.h>

#include <linux/kdebug.h>

#include <linux/ftrace.h>



#include <asm/kdebug.h>

#include <asm/ptrace.h>
@@ -108,7 +109,7 @@ void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs) 
}



#ifdef CONFIG_SMP

void smp_kgdb_capture_client(int irq, struct pt_regs *regs)

void __irq_entry smp_kgdb_capture_client(int irq, struct pt_regs *regs)

{

	unsigned long flags;