[PATCH 5/9] ftrace, ia64: IA64 static ftrace support

Steven Rostedt
2009-01-13T06:14:09Z

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From: Shaohua Li <shaohua.li@intel.com>

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>
---
arch/ia64/Kconfig | 1 +
arch/ia64/include/asm/ftrace.h | 15 ++++++++++++
arch/ia64/kernel/entry.S | 49 ++++++++++++++++++++++++++++++++++++++++
arch/ia64/kernel/ia64_ksyms.c | 6 +++++
4 files changed, 71 insertions(+), 0 deletions(-)
create mode 100644 arch/ia64/include/asm/ftrace.h

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 3d31636..b992ba4 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -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
diff --git a/arch/ia64/include/asm/ftrace.h b/arch/ia64/include/asm/ftrace.h
new file mode 100644
index 0000000..48694b3
--- /dev/null
+++ b/arch/ia64/include/asm/ftrace.h
@@ -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 */
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index d435f4a..c2f7d79 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -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
diff --git a/arch/ia64/kernel/ia64_ksyms.c b/arch/ia64/kernel/ia64_ksyms.c
index 6da1f20..2d31186 100644
--- a/arch/ia64/kernel/ia64_ksyms.c
+++ b/arch/ia64/kernel/ia64_ksyms.c
@@ -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
--
1.5.6.5

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