lkml.org 
[lkml]   [2022]   [Jun]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH v3 10/12] objtool/powerpc: Add --mcount specific implementation
Date
This patch enables objtool --mcount on powerpc, and
adds implementation specific to powerpc.

Signed-off-by: Sathvika Vasireddy <sv@linux.ibm.com>
---
arch/powerpc/Kconfig | 1 +
tools/objtool/arch/powerpc/decode.c | 22 +++++++++++++++++++
tools/objtool/arch/powerpc/include/arch/elf.h | 2 ++
3 files changed, 25 insertions(+)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 732a3f91ee5e..3373d44a1298 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -233,6 +233,7 @@ config PPC
select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S)
select HAVE_OPTPROBES
select HAVE_OBJTOOL if PPC64
+ select HAVE_OBJTOOL_MCOUNT if HAVE_OBJTOOL
select HAVE_PERF_EVENTS
select HAVE_PERF_EVENTS_NMI if PPC64
select HAVE_PERF_REGS
diff --git a/tools/objtool/arch/powerpc/decode.c b/tools/objtool/arch/powerpc/decode.c
index 8b6a14680da7..06fc0206bf8e 100644
--- a/tools/objtool/arch/powerpc/decode.c
+++ b/tools/objtool/arch/powerpc/decode.c
@@ -9,6 +9,14 @@
#include <objtool/builtin.h>
#include <objtool/endianness.h>

+bool arch_ftrace_match(char *name)
+{
+ if ((!strcmp(name, "_mcount")) || (!strcmp(name, "._mcount")))
+ return true;
+
+ return false;
+}
+
unsigned long arch_dest_reloc_offset(int addend)
{
return addend;
@@ -41,12 +49,26 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
struct list_head *ops_list)
{
u32 insn;
+ unsigned int opcode;

*immediate = 0;
insn = bswap_if_needed(file->elf, *(u32 *)(sec->data->d_buf + offset));
*len = 4;
*type = INSN_OTHER;

+ opcode = insn >> 26;
+
+ switch (opcode) {
+ case 18: /* bl */
+ if ((insn & 3) == 1) {
+ *type = INSN_CALL;
+ *immediate = insn & 0x3fffffc;
+ if (*immediate & 0x2000000)
+ *immediate -= 0x4000000;
+ }
+ break;
+ }
+
return 0;
}

diff --git a/tools/objtool/arch/powerpc/include/arch/elf.h b/tools/objtool/arch/powerpc/include/arch/elf.h
index 3c8ebb7d2a6b..73f9ae172fe5 100644
--- a/tools/objtool/arch/powerpc/include/arch/elf.h
+++ b/tools/objtool/arch/powerpc/include/arch/elf.h
@@ -4,5 +4,7 @@
#define _OBJTOOL_ARCH_ELF

#define R_NONE R_PPC_NONE
+#define R_ABS64 R_PPC64_ADDR64
+#define R_ABS32 R_PPC_ADDR32

#endif /* _OBJTOOL_ARCH_ELF */
--
2.25.1
\
 
 \ /
  Last update: 2022-06-24 20:36    [W:0.239 / U:1.360 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site