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Commit d3e75ff1 authored by Shaohua Li's avatar Shaohua Li Committed by Ingo Molnar
Browse files

ftrace, ia64: IA64 static ftrace support 



IA64 ftrace suppport. In IA64, below code will be added in each function
if -pg is enabled.

alloc r40=ar.pfs,12,8,0
mov r43=r0;;
mov r42=b0
mov r41=r1
nop.i 0x0
br.call.sptk.many b0 = _mcount;;

Signed-off-by: default avatarShaohua Li <shaohua.li@intel.com>
Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 418071eb

arch/ia64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ config IA64 
	select HAVE_OPROFILE

	select HAVE_KPROBES

	select HAVE_KRETPROBES

	select HAVE_FUNCTION_TRACER

	select HAVE_DMA_ATTRS

	select HAVE_KVM

	select HAVE_ARCH_TRACEHOOK

arch/ia64/include/asm/ftrace.h

0 → 100644
+15 −0
Original line number Diff line number Diff line 
#ifndef _ASM_IA64_FTRACE_H

#define _ASM_IA64_FTRACE_H



#ifdef CONFIG_FUNCTION_TRACER

#define MCOUNT_INSN_SIZE        32 /* sizeof mcount call */



#ifndef __ASSEMBLY__

extern void _mcount(unsigned long pfs, unsigned long r1, unsigned long b0, unsigned long r0);

#define mcount _mcount



#endif



#endif /* CONFIG_FUNCTION_TRACER */



#endif /* _ASM_IA64_FTRACE_H */

arch/ia64/kernel/entry.S

+49 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ 
#include <asm/processor.h>

#include <asm/thread_info.h>

#include <asm/unistd.h>

#include <asm/ftrace.h>



#include "minstate.h"
@@ -1404,6 +1405,54 @@ GLOBAL_ENTRY(unw_init_running) 
	br.ret.sptk.many rp

END(unw_init_running)



#ifdef CONFIG_FUNCTION_TRACER

GLOBAL_ENTRY(_mcount)

	movl r2 = ftrace_stub

	movl r3 = ftrace_trace_function;;

	ld8 r3 = [r3];;

	ld8 r3 = [r3];;

	cmp.eq p7,p0 = r2, r3

(p7)	br.sptk.many ftrace_stub

	;;



	alloc loc0 = ar.pfs, 4, 4, 2, 0

	;;

	mov loc1 = b0

	mov out0 = b0

	mov loc2 = r8

	mov loc3 = r15

	;;

	adds out0 = -MCOUNT_INSN_SIZE, out0

	mov out1 = in2

	mov b6 = r3



	br.call.sptk.many b0 = b6

	;;

	mov ar.pfs = loc0

	mov b0 = loc1

	mov r8 = loc2

	mov r15 = loc3

	br ftrace_stub

	;;

END(_mcount)



GLOBAL_ENTRY(ftrace_stub)

	mov r3 = b0

	movl r2 = _mcount_ret_helper

	;;

	mov b6 = r2

	mov b7 = r3

	br.ret.sptk.many b6



_mcount_ret_helper:

	mov b0 = r42

	mov r1 = r41

	mov ar.pfs = r40

	br b7

END(ftrace_stub)



#endif /* CONFIG_FUNCTION_TRACER */



	.rodata

	.align 8

	.globl sys_call_table

arch/ia64/kernel/ia64_ksyms.c

+6 −0
Original line number Diff line number Diff line
@@ -112,3 +112,9 @@ EXPORT_SYMBOL_GPL(esi_call_phys); 
#endif

extern char ia64_ivt[];

EXPORT_SYMBOL(ia64_ivt);



#include <asm/ftrace.h>

#ifdef CONFIG_FUNCTION_TRACER

/* mcount is defined in assembly */

EXPORT_SYMBOL(_mcount);

#endif