From 521ccb5c4aece609311bfa7157910a8f0c942af5 Mon Sep 17 00:00:00 2001
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Tue, 10 May 2011 10:10:41 +0200
Subject: [PATCH] ftrace/x86: mcount offset calculation
Do the mcount offset adjustment in the recordmcount.pl/recordmcount.[ch]
at compile time and not in ftrace_call_adjust at run time.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
arch/x86/include/asm/ftrace.h | 7 +++----
scripts/recordmcount.c | 2 ++
scripts/recordmcount.pl | 2 ++
3 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index db24c2278be0..268c783ab1c0 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h
@@ -38,11 +38,10 @@ extern void mcount(void);
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
/*
- * call mcount is "e8 <4 byte offset>"
- * The addr points to the 4 byte offset and the caller of this
- * function wants the pointer to e8. Simply subtract one.
+ * addr is the address of the mcount call instruction.
+ * recordmcount does the necessary offset calculation.
*/
- return addr - 1;
+ return addr;
}
#ifdef CONFIG_DYNAMIC_FTRACE
diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index 0e18975824f7..7648a5d11154 100644
--- a/scripts/recordmcount.c
+++ b/scripts/recordmcount.c
@@ -335,6 +335,7 @@ do_file(char const *const fname)
reltype = R_386_32;
make_nop = make_nop_x86;
ideal_nop = ideal_nop5_x86_32;
+ mcount_adjust_32 = -1;
break;
case EM_ARM: reltype = R_ARM_ABS32;
altmcount = "__gnu_mcount_nc";
@@ -350,6 +351,7 @@ do_file(char const *const fname)
make_nop = make_nop_x86;
ideal_nop = ideal_nop5_x86_64;
reltype = R_X86_64_64;
+ mcount_adjust_64 = -1;
break;
} /* end switch */
diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index a871cd414055..414e7f5e42ec 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -223,6 +223,7 @@ if ($arch eq "x86_64") {
$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount([+-]0x[0-9a-zA-Z]+)?\$";
$type = ".quad";
$alignment = 8;
+ $mcount_adjust = -1;
# force flags for this arch
$ld .= " -m elf_x86_64";
@@ -232,6 +233,7 @@ if ($arch eq "x86_64") {
} elsif ($arch eq "i386") {
$alignment = 4;
+ $mcount_adjust = -1;
# force flags for this arch
$ld .= " -m elf_i386";
--
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