From: Vasily Gorbik <gor@linux.ibm.com>
To: Josh Poimboeuf <jpoimboe@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Miroslav Benes <mbenes@suse.cz>,
Alexandre Chartre <alexandre.chartre@oracle.com>,
Julien Thierry <jthierry@redhat.com>,
linux-kernel@vger.kernel.org
Subject: [RFC PATCH 2/2] objtool: fix x86 orc generation on big endian cross compiles
Date: Wed, 30 Sep 2020 11:58:31 +0200 [thread overview]
Message-ID: <patch-2.thread-e6a24b.git-e6a24bf796d2.your-ad-here.call-01601459756-ext-4914@work.hours> (raw)
In-Reply-To: <cover.thread-e6a24b.your-ad-here.call-01601459756-ext-4914@work.hours>
Correct objtool orc generation endianness problems to enable fully
functional x86 cross compiles on big endian hardware.
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
---
arch/x86/include/asm/orc_types.h | 24 ++++++++++++++++++++++++
tools/arch/x86/include/asm/orc_types.h | 24 ++++++++++++++++++++++++
tools/objtool/orc_dump.c | 4 ++--
tools/objtool/orc_gen.c | 2 ++
4 files changed, 52 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/orc_types.h b/arch/x86/include/asm/orc_types.h
index d25534940bde..931f99b70af3 100644
--- a/arch/x86/include/asm/orc_types.h
+++ b/arch/x86/include/asm/orc_types.h
@@ -61,6 +61,13 @@
#define UNWIND_HINT_TYPE_RET_OFFSET 3
#ifndef __ASSEMBLY__
+#ifdef __KERNEL__
+#include <linux/swab.h>
+#include <asm/byteorder.h>
+#else
+#include <endian.h>
+#endif
+
/*
* This struct is more or less a vastly simplified version of the DWARF Call
* Frame Information standard. It contains only the necessary parts of DWARF
@@ -69,6 +76,9 @@
* the stack for a given code address. Each instance of the struct corresponds
* to one or more code locations.
*/
+#if defined(__BYTE_ORDER) ? \
+ __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)
+
struct orc_entry {
s16 sp_offset;
s16 bp_offset;
@@ -78,6 +88,20 @@ struct orc_entry {
unsigned end:1;
} __packed;
+#else
+
+struct orc_entry {
+ s16 sp_offset;
+ s16 bp_offset;
+ unsigned bp_reg:4;
+ unsigned sp_reg:4;
+ unsigned unused:5;
+ unsigned end:1;
+ unsigned type:2;
+} __packed;
+
+#endif
+
/*
* This struct is used by asm and inline asm code to manually annotate the
* location of registers on the stack for the ORC unwinder.
diff --git a/tools/arch/x86/include/asm/orc_types.h b/tools/arch/x86/include/asm/orc_types.h
index d25534940bde..931f99b70af3 100644
--- a/tools/arch/x86/include/asm/orc_types.h
+++ b/tools/arch/x86/include/asm/orc_types.h
@@ -61,6 +61,13 @@
#define UNWIND_HINT_TYPE_RET_OFFSET 3
#ifndef __ASSEMBLY__
+#ifdef __KERNEL__
+#include <linux/swab.h>
+#include <asm/byteorder.h>
+#else
+#include <endian.h>
+#endif
+
/*
* This struct is more or less a vastly simplified version of the DWARF Call
* Frame Information standard. It contains only the necessary parts of DWARF
@@ -69,6 +76,9 @@
* the stack for a given code address. Each instance of the struct corresponds
* to one or more code locations.
*/
+#if defined(__BYTE_ORDER) ? \
+ __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)
+
struct orc_entry {
s16 sp_offset;
s16 bp_offset;
@@ -78,6 +88,20 @@ struct orc_entry {
unsigned end:1;
} __packed;
+#else
+
+struct orc_entry {
+ s16 sp_offset;
+ s16 bp_offset;
+ unsigned bp_reg:4;
+ unsigned sp_reg:4;
+ unsigned unused:5;
+ unsigned end:1;
+ unsigned type:2;
+} __packed;
+
+#endif
+
/*
* This struct is used by asm and inline asm code to manually annotate the
* location of registers on the stack for the ORC unwinder.
diff --git a/tools/objtool/orc_dump.c b/tools/objtool/orc_dump.c
index fca46e006fc2..0fbf8521c891 100644
--- a/tools/objtool/orc_dump.c
+++ b/tools/objtool/orc_dump.c
@@ -196,11 +196,11 @@ int orc_dump(const char *_objname)
printf(" sp:");
- print_reg(orc[i].sp_reg, orc[i].sp_offset);
+ print_reg(orc[i].sp_reg, (s16)le16toh(orc[i].sp_offset));
printf(" bp:");
- print_reg(orc[i].bp_reg, orc[i].bp_offset);
+ print_reg(orc[i].bp_reg, (s16)le16toh(orc[i].bp_offset));
printf(" type:%s end:%d\n",
orc_type_name(orc[i].type), orc[i].end);
diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c
index 968f55e6dd94..b3978fad93e6 100644
--- a/tools/objtool/orc_gen.c
+++ b/tools/objtool/orc_gen.c
@@ -90,6 +90,8 @@ static int create_orc_entry(struct elf *elf, struct section *u_sec, struct secti
/* populate ORC data */
orc = (struct orc_entry *)u_sec->data->d_buf + idx;
memcpy(orc, o, sizeof(*orc));
+ orc->sp_offset = htole16(orc->sp_offset);
+ orc->bp_offset = htole16(orc->bp_offset);
/* populate reloc for ip */
reloc = malloc(sizeof(*reloc));
--
⣿⣿⣿⣿⢋⡀⣀⠹⣿⣿⣿⣿
⣿⣿⣿⣿⠠⣶⡦⠀⣿⣿⣿⣿
⣿⣿⣿⠏⣴⣮⣴⣧⠈⢿⣿⣿
⣿⣿⡏⢰⣿⠖⣠⣿⡆⠈⣿⣿
⣿⢛⣵⣄⠙⣶⣶⡟⣅⣠⠹⣿
⣿⣜⣛⠻⢎⣉⣉⣀⠿⣫⣵⣿
next prev parent reply other threads:[~2020-09-30 9:59 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-30 9:58 [RFC PATCH 0/2] objtool and cross compilation Vasily Gorbik
2020-09-30 9:58 ` [RFC PATCH 1/2] objtool: x86 instruction decoder and big endian cross compiles Vasily Gorbik
2020-09-30 9:58 ` Vasily Gorbik [this message]
2020-09-30 10:12 ` [RFC PATCH 0/2] objtool and cross compilation Peter Zijlstra
2020-09-30 12:24 ` [RFC PATCH v2 " Vasily Gorbik
2020-09-30 12:24 ` [RFC PATCH v2 1/2] objtool: x86 instruction decoder and big endian cross compiles Vasily Gorbik
2020-09-30 15:19 ` Josh Poimboeuf
2020-09-30 12:24 ` [RFC PATCH v2 2/2] objtool: fix x86 orc generation on " Vasily Gorbik
2020-09-30 13:06 ` David Laight
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=patch-2.thread-e6a24b.git-e6a24bf796d2.your-ad-here.call-01601459756-ext-4914@work.hours \
--to=gor@linux.ibm.com \
--cc=alexandre.chartre@oracle.com \
--cc=bp@alien8.de \
--cc=hpa@zytor.com \
--cc=jpoimboe@redhat.com \
--cc=jthierry@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mbenes@suse.cz \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).