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From: Julien Thierry <jthierry@redhat.com>
To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com,
	ardb@kernel.org, masahiroy@kernel.org, jpoimboe@redhat.com,
	peterz@infradead.org, ycote@redhat.com,
	Julien Thierry <jthierry@redhat.com>
Subject: [RFC PATCH v2 06/13] objtool: arm64: Decode jump and call related instructions
Date: Wed,  3 Mar 2021 18:09:25 +0100	[thread overview]
Message-ID: <20210303170932.1838634-7-jthierry@redhat.com> (raw)
In-Reply-To: <20210303170932.1838634-1-jthierry@redhat.com>

Decode branch, branch and link (aarch64's call) and return instructions.

Signed-off-by: Julien Thierry <jthierry@redhat.com>
---
 tools/objtool/arch/arm64/decode.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c
index 54eeb8704a42..983f16b8b2af 100644
--- a/tools/objtool/arch/arm64/decode.c
+++ b/tools/objtool/arch/arm64/decode.c
@@ -215,6 +215,28 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
 		}
 		*type = INSN_OTHER;
 		break;
+	case AARCH64_INSN_CLS_BR_SYS:
+		if (aarch64_insn_is_ret(insn) &&
+		    aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RN, insn) == AARCH64_INSN_REG_LR) {
+			*type = INSN_RETURN;
+		} else if (aarch64_insn_is_bl(insn)) {
+			*type = INSN_CALL;
+			*immediate = aarch64_get_branch_offset(insn);
+		} else if (aarch64_insn_is_blr(insn)) {
+			*type = INSN_CALL_DYNAMIC;
+		} else if (aarch64_insn_is_b(insn)) {
+			*type = INSN_JUMP_UNCONDITIONAL;
+			*immediate = aarch64_get_branch_offset(insn);
+		} else if (aarch64_insn_is_br(insn)) {
+			*type = INSN_JUMP_DYNAMIC;
+		} else if (aarch64_insn_is_branch_imm(insn)) {
+			/* Remaining branch opcodes are conditional */
+			*type = INSN_JUMP_CONDITIONAL;
+			*immediate = aarch64_get_branch_offset(insn);
+		} else {
+			*type = INSN_OTHER;
+		}
+		break;
 	default:
 		*type = INSN_OTHER;
 		break;
-- 
2.25.4


WARNING: multiple messages have this Message-ID (diff)
From: Julien Thierry <jthierry@redhat.com>
To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com,
	ardb@kernel.org, masahiroy@kernel.org, jpoimboe@redhat.com,
	peterz@infradead.org, ycote@redhat.com,
	Julien Thierry <jthierry@redhat.com>
Subject: [RFC PATCH v2 06/13] objtool: arm64: Decode jump and call related instructions
Date: Wed,  3 Mar 2021 18:09:25 +0100	[thread overview]
Message-ID: <20210303170932.1838634-7-jthierry@redhat.com> (raw)
In-Reply-To: <20210303170932.1838634-1-jthierry@redhat.com>

Decode branch, branch and link (aarch64's call) and return instructions.

Signed-off-by: Julien Thierry <jthierry@redhat.com>
---
 tools/objtool/arch/arm64/decode.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c
index 54eeb8704a42..983f16b8b2af 100644
--- a/tools/objtool/arch/arm64/decode.c
+++ b/tools/objtool/arch/arm64/decode.c
@@ -215,6 +215,28 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
 		}
 		*type = INSN_OTHER;
 		break;
+	case AARCH64_INSN_CLS_BR_SYS:
+		if (aarch64_insn_is_ret(insn) &&
+		    aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RN, insn) == AARCH64_INSN_REG_LR) {
+			*type = INSN_RETURN;
+		} else if (aarch64_insn_is_bl(insn)) {
+			*type = INSN_CALL;
+			*immediate = aarch64_get_branch_offset(insn);
+		} else if (aarch64_insn_is_blr(insn)) {
+			*type = INSN_CALL_DYNAMIC;
+		} else if (aarch64_insn_is_b(insn)) {
+			*type = INSN_JUMP_UNCONDITIONAL;
+			*immediate = aarch64_get_branch_offset(insn);
+		} else if (aarch64_insn_is_br(insn)) {
+			*type = INSN_JUMP_DYNAMIC;
+		} else if (aarch64_insn_is_branch_imm(insn)) {
+			/* Remaining branch opcodes are conditional */
+			*type = INSN_JUMP_CONDITIONAL;
+			*immediate = aarch64_get_branch_offset(insn);
+		} else {
+			*type = INSN_OTHER;
+		}
+		break;
 	default:
 		*type = INSN_OTHER;
 		break;
-- 
2.25.4


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  parent reply	other threads:[~2021-03-03 19:29 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-03 17:09 [RFC PATCH v2 00/13] objtool: add base support for arm64 Julien Thierry
2021-03-03 17:09 ` Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 01/13] tools: Add some generic functions and headers Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 02/13] tools: arm64: Make aarch64 instruction decoder available to tools Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 03/13] tools: bug: Remove duplicate definition Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 04/13] objtool: arm64: Add base definition for arm64 backend Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 05/13] objtool: arm64: Decode add/sub instructions Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-03 17:09 ` Julien Thierry [this message]
2021-03-03 17:09   ` [RFC PATCH v2 06/13] objtool: arm64: Decode jump and call related instructions Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 07/13] objtool: arm64: Decode other system instructions Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 08/13] objtool: arm64: Decode load/store instructions Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 09/13] objtool: arm64: Decode LDR instructions Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 10/13] objtool: arm64: Accept padding in code sections Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 11/13] objtool: arm64: Handle supported relocations in alternatives Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 12/13] objtool: arm64: Ignore replacement section for alternative callback Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-03 17:09 ` [RFC PATCH v2 13/13] objtool: arm64: Enable stack validation for arm64 Julien Thierry
2021-03-03 17:09   ` Julien Thierry
2021-03-07 10:25   ` Ard Biesheuvel
2021-03-07 10:25     ` Ard Biesheuvel
2021-03-09 14:31     ` Julien Thierry
2021-03-09 14:31       ` Julien Thierry
2021-03-03 19:17 ` [RFC PATCH v2 00/13] objtool: add base support " Peter Zijlstra
2021-03-03 19:17   ` Peter Zijlstra
2021-03-04 14:03   ` Julien Thierry
2021-03-04 14:03     ` Julien Thierry
2021-03-05 23:51 ` Nick Desaulniers
2021-03-05 23:51   ` Nick Desaulniers
2021-03-06  0:04   ` Nick Desaulniers
2021-03-06  0:04     ` Nick Desaulniers
2021-03-09 14:27     ` Julien Thierry
2021-03-09 14:27       ` Julien Thierry

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