From: Julien Thierry <jthierry@redhat.com>
To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: mark.rutland@arm.com, linux-efi@vger.kernel.org,
michal.lkml@markovi.net, keescook@chromium.org,
peterz@infradead.org, catalin.marinas@arm.com,
masahiroy@kernel.org, broonie@kernel.org,
linux-hardening@vger.kernel.org, jpoimboe@redhat.com,
will@kernel.org, ardb@kernel.org,
Julien Thierry <jthierry@redhat.com>
Subject: [RFC PATCH 15/17] objtool: arm64: Handle supported relocations in alternatives
Date: Wed, 20 Jan 2021 18:37:58 +0100 [thread overview]
Message-ID: <20210120173800.1660730-16-jthierry@redhat.com> (raw)
In-Reply-To: <20210120173800.1660730-1-jthierry@redhat.com>
Based on get_alt_insn() in arch/arm64/kernel/alternative.c, arm64
alternative code adapts offsets for static branches and adrp
instructions.
Signed-off-by: Julien Thierry <jthierry@redhat.com>
---
tools/objtool/arch/arm64/special.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/tools/objtool/arch/arm64/special.c b/tools/objtool/arch/arm64/special.c
index c9c3e0bfd581..d47e5590ed60 100644
--- a/tools/objtool/arch/arm64/special.c
+++ b/tools/objtool/arch/arm64/special.c
@@ -30,7 +30,11 @@ bool arch_support_alt_relocation(struct special_alt *special_alt,
struct instruction *insn,
struct reloc *reloc)
{
- return false;
+ u32 opcode = *(u32 *)(insn->sec->data->d_buf + insn->offset);
+
+ return aarch64_insn_is_branch_imm(opcode) ||
+ aarch64_insn_is_adrp(opcode) ||
+ !aarch64_insn_uses_literal(opcode);
}
static struct section *get_switch_table_info_section(struct objtool_file *file)
--
2.25.4
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next prev parent reply other threads:[~2021-01-20 17:47 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-20 17:37 [RFC PATCH 00/17] objtool: add base support for arm64 Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 01/17] tools: Add some generic functions and headers Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 02/17] tools: arm64: Make aarch64 instruction decoder available to tools Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 03/17] tools: bug: Remove duplicate definition Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 04/17] objtool: arm64: Add base definition for arm64 backend Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 05/17] objtool: arm64: Decode add/sub instructions Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 06/17] objtool: arm64: Decode jump and call related instructions Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 07/17] objtool: arm64: Decode other system instructions Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 08/17] objtool: arm64: Decode load/store instructions Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 09/17] objtool: arm64: Decode LDR instructions Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 10/17] objtool: arm64: Accept padding in code sections Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 11/17] efi: libstub: Ignore relocations for .discard sections Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 12/17] gcc-plugins: objtool: Add plugin to detect switch table on arm64 Julien Thierry
2021-01-27 22:15 ` Nick Desaulniers
2021-01-27 23:26 ` Josh Poimboeuf
2021-01-29 18:10 ` Nick Desaulniers
2021-02-01 21:44 ` Josh Poimboeuf
2021-02-01 23:17 ` Nick Desaulniers
2021-02-02 0:02 ` Josh Poimboeuf
2021-02-02 14:24 ` David Laight
2021-02-02 22:33 ` Nick Desaulniers
2021-02-02 23:36 ` Josh Poimboeuf
2021-02-02 23:52 ` Nick Desaulniers
2021-02-02 8:57 ` Julien Thierry
2021-02-02 23:01 ` Nick Desaulniers
2021-02-03 0:14 ` Josh Poimboeuf
2021-02-03 11:57 ` Peter Zijlstra
2021-02-03 13:04 ` Mark Brown
2021-02-03 13:58 ` Mark Rutland
2021-02-03 8:11 ` Julien Thierry
2021-02-09 16:30 ` Daniel Kiss
2021-01-20 17:37 ` [RFC PATCH 13/17] objtool: arm64: Implement functions to add switch tables alternatives Julien Thierry
2021-01-20 17:37 ` [RFC PATCH 14/17] objtool: arm64: Cache section with switch table information Julien Thierry
2021-01-20 17:37 ` Julien Thierry [this message]
2021-01-20 17:37 ` [RFC PATCH 16/17] objtool: arm64: Ignore replacement section for alternative callback Julien Thierry
2021-01-20 17:38 ` [RFC PATCH 17/17] objtool: arm64: Enable stack validation for arm64 Julien Thierry
2021-01-21 9:03 ` [RFC PATCH 00/17] objtool: add base support " Ard Biesheuvel
2021-01-21 10:26 ` Julien Thierry
2021-01-21 11:08 ` Ard Biesheuvel
2021-01-21 11:23 ` Peter Zijlstra
2021-01-21 11:48 ` Ard Biesheuvel
2021-01-21 18:54 ` Josh Poimboeuf
2021-01-22 17:43 ` Mark Brown
2021-01-22 17:54 ` Ard Biesheuvel
2021-01-28 22:10 ` Madhavan T. Venkataraman
2021-01-29 15:47 ` Mark Brown
2021-01-22 21:15 ` Madhavan T. Venkataraman
2021-01-22 21:43 ` Ard Biesheuvel
2021-01-22 21:44 ` Madhavan T. Venkataraman
2021-01-25 21:19 ` Josh Poimboeuf
2021-01-22 21:16 ` Madhavan T. Venkataraman
2021-01-21 13:23 ` Julien Thierry
2021-01-21 14:23 ` Mark Brown
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