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ftrace, ia64: IA64 static ftrace support

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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: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Shaohua Li 2009-01-09 11:29:46 +08:00 committed by Ingo Molnar
parent 418071eb6a
commit d3e75ff14b
4 changed files with 71 additions and 0 deletions
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1
arch/ia64/Kconfig
View File

@ -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

15
arch/ia64/include/asm/ftrace.h Normal file
View File

@ -0,0 +1,15 @@
#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 */

49
arch/ia64/kernel/entry.S
View File

@ -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

6
arch/ia64/kernel/ia64_ksyms.c
View File

@ -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