From 0ef5bf1cd3bd2e3eacb11fca80efe3674927ed1a Mon Sep 17 00:00:00 2001
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Tue, 10 May 2011 10:10:43 +0200
Subject: [PATCH] ftrace/s390: 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/s390/include/asm/ftrace.h | 4 +---
scripts/recordmcount.c | 8 ++++++--
scripts/recordmcount.pl | 2 ++
3 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h
index 3c29be4836ed..b7931faaef6d 100644
--- a/arch/s390/include/asm/ftrace.h
+++ b/arch/s390/include/asm/ftrace.h
@@ -11,15 +11,13 @@ struct dyn_arch_ftrace { };
#ifdef CONFIG_64BIT
#define MCOUNT_INSN_SIZE 12
-#define MCOUNT_OFFSET 8
#else
#define MCOUNT_INSN_SIZE 20
-#define MCOUNT_OFFSET 4
#endif
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
- return addr - MCOUNT_OFFSET;
+ return addr;
}
#endif /* __ASSEMBLY__ */
diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c
index 7648a5d11154..ee52cb8e17ad 100644
--- a/scripts/recordmcount.c
+++ b/scripts/recordmcount.c
@@ -368,8 +368,10 @@ do_file(char const *const fname)
"unrecognized ET_REL file: %s\n", fname);
fail_file();
}
- if (w2(ehdr->e_machine) == EM_S390)
+ if (w2(ehdr->e_machine) == EM_S390) {
reltype = R_390_32;
+ mcount_adjust_32 = -4;
+ }
if (w2(ehdr->e_machine) == EM_MIPS) {
reltype = R_MIPS_32;
is_fake_mcount32 = MIPS32_is_fake_mcount;
@@ -384,8 +386,10 @@ do_file(char const *const fname)
"unrecognized ET_REL file: %s\n", fname);
fail_file();
}
- if (w2(ghdr->e_machine) == EM_S390)
+ if (w2(ghdr->e_machine) == EM_S390) {
reltype = R_390_64;
+ mcount_adjust_64 = -8;
+ }
if (w2(ghdr->e_machine) == EM_MIPS) {
reltype = R_MIPS_64;
Elf64_r_sym = MIPS64_r_sym;
diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 414e7f5e42ec..858966ab019c 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -243,12 +243,14 @@ if ($arch eq "x86_64") {
} elsif ($arch eq "s390" && $bits == 32) {
$mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_32\\s+_mcount\$";
+ $mcount_adjust = -4;
$alignment = 4;
$ld .= " -m elf_s390";
$cc .= " -m31";
} elsif ($arch eq "s390" && $bits == 64) {
$mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_390_(PC|PLT)32DBL\\s+_mcount\\+0x2\$";
+ $mcount_adjust = -8;
$alignment = 8;
$type = ".quad";
$ld .= " -m elf64_s390";
--
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