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From: Wang ShaoBo <bobo.shaobowang@huawei.com>
Cc: <cj.chengjian@huawei.com>, <huawei.libin@huawei.com>,
	<xiexiuqi@huawei.com>, <liwei391@huawei.com>,
	<linux-kernel@vger.kernel.org>,
	 <linux-arm-kernel@lists.infradead.org>,
	<catalin.marinas@arm.com>, <will@kernel.org>,
	<rostedt@goodmis.org>, <mark.rutland@arm.com>,
	<bobo.shaobowang@huawei.com>, <zengshun.wu@outlook.com>
Subject: [RFC PATCH -next v2 1/4] arm64: introduce aarch64_insn_gen_load_literal
Date: Wed, 16 Mar 2022 18:01:29 +0800	[thread overview]
Message-ID: <20220316100132.244849-2-bobo.shaobowang@huawei.com> (raw)
In-Reply-To: <20220316100132.244849-1-bobo.shaobowang@huawei.com>

From: Cheng Jian <cj.chengjian@huawei.com>

This introduces helper to generate ldr(literal) instructions.

	LDR <Xt>, <label>

Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
---
 arch/arm64/include/asm/insn.h |  6 +++++
 arch/arm64/lib/insn.c         | 49 +++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
index 6b776c8667b2..95b3562843c2 100644
--- a/arch/arm64/include/asm/insn.h
+++ b/arch/arm64/include/asm/insn.h
@@ -458,6 +458,9 @@ u32 aarch64_insn_gen_hint(enum aarch64_insn_hint_cr_op op);
 u32 aarch64_insn_gen_nop(void);
 u32 aarch64_insn_gen_branch_reg(enum aarch64_insn_register reg,
 				enum aarch64_insn_branch_type type);
+u32 aarch64_insn_gen_load_literal(enum aarch64_insn_register reg,
+				  enum aarch64_insn_variant variant,
+				  long offset);
 u32 aarch64_insn_gen_load_store_reg(enum aarch64_insn_register reg,
 				    enum aarch64_insn_register base,
 				    enum aarch64_insn_register offset,
@@ -544,6 +547,9 @@ u32 aarch64_insn_gen_prefetch(enum aarch64_insn_register base,
 s32 aarch64_get_branch_offset(u32 insn);
 u32 aarch64_set_branch_offset(u32 insn, s32 offset);
 
+s32 aarch64_insn_get_ldr_lit_offset(u32 insn);
+u32 aarch64_insn_set_ldr_lit_offset(u32 insn, u32 offset);
+
 s32 aarch64_insn_adrp_get_offset(u32 insn);
 u32 aarch64_insn_adrp_set_offset(u32 insn, s32 offset);
 
diff --git a/arch/arm64/lib/insn.c b/arch/arm64/lib/insn.c
index fccfe363e567..9ac5fb4e76e8 100644
--- a/arch/arm64/lib/insn.c
+++ b/arch/arm64/lib/insn.c
@@ -17,6 +17,7 @@
 #include <asm/kprobes.h>
 
 #define AARCH64_INSN_SF_BIT	BIT(31)
+#define AARCH64_INSN_OPC_BIT	BIT(30)
 #define AARCH64_INSN_N_BIT	BIT(22)
 #define AARCH64_INSN_LSL_12	BIT(22)
 
@@ -473,6 +474,54 @@ u32 aarch64_insn_gen_branch_reg(enum aarch64_insn_register reg,
 	return aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn, reg);
 }
 
+s32 aarch64_insn_get_ldr_lit_offset(u32 insn)
+{
+	s32 imm;
+
+	if (aarch64_insn_is_ldr_lit(insn)) {
+		imm = aarch64_insn_decode_immediate(AARCH64_INSN_IMM_19, insn);
+		return (imm << 13) >> 11;
+	}
+
+	/* Unhandled instruction */
+	BUG();
+}
+
+u32 aarch64_insn_set_ldr_lit_offset(u32 insn, u32 offset)
+{
+	if (aarch64_insn_is_ldr_lit(insn))
+		return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_19, insn,
+						     offset >> 2);
+	/* Unhandled instruction */
+	BUG();
+}
+
+u32 aarch64_insn_gen_load_literal(enum aarch64_insn_register reg,
+				  enum aarch64_insn_variant variant,
+				  long offset)
+{
+	u32 insn;
+
+	insn = aarch64_insn_get_ldr_lit_value();
+
+	switch (variant) {
+	case AARCH64_INSN_VARIANT_32BIT:
+		/* 32-bit ops == 00 */
+		break;
+	case AARCH64_INSN_VARIANT_64BIT:
+		/* 64-bit opc == 01 */
+		insn |= AARCH64_INSN_OPC_BIT;
+		break;
+	default:
+		pr_err("%s: unknown variant encoding %d\n", __func__, variant);
+		return AARCH64_BREAK_FAULT;
+	}
+
+	insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RT, insn, reg);
+
+	return aarch64_insn_set_ldr_lit_offset(insn, offset);
+}
+
 u32 aarch64_insn_gen_load_store_reg(enum aarch64_insn_register reg,
 				    enum aarch64_insn_register base,
 				    enum aarch64_insn_register offset,
-- 
2.25.1


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  reply	other threads:[~2022-03-16  9:53 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-16 10:01 [RFC PATCH -next v2 0/4] arm64/ftrace: support dynamic trampoline Wang ShaoBo
2022-03-16 10:01 ` Wang ShaoBo [this message]
2022-03-16 10:01 ` [RFC PATCH -next v2 2/4] arm64/ftrace: introduce ftrace dynamic trampoline entrances Wang ShaoBo
2022-03-16 10:01 ` [RFC PATCH -next v2 3/4] arm64/ftrace: support dynamically allocated trampolines Wang ShaoBo
2022-04-21 13:10   ` Mark Rutland
2022-04-21 14:06     ` Steven Rostedt
2022-04-21 14:08       ` Steven Rostedt
2022-04-21 15:14       ` Mark Rutland
2022-04-21 15:42         ` Steven Rostedt
2022-04-21 16:27           ` Mark Rutland
2022-04-21 17:06             ` Steven Rostedt
2022-04-22 10:12               ` Mark Rutland
2022-04-22 15:45                 ` Steven Rostedt
2022-04-22 17:27                   ` Mark Rutland
2022-04-26  8:47                     ` Masami Hiramatsu
2022-05-04 10:24                       ` Mark Rutland
2022-05-05  3:15                         ` Masami Hiramatsu
2022-05-09 18:22                           ` Steven Rostedt
2022-05-10  9:10                             ` Masami Hiramatsu
2022-05-10 14:44                               ` Steven Rostedt
2022-05-11 14:34                                 ` Masami Hiramatsu
2022-05-11 15:12                                   ` Steven Rostedt
2022-05-12 12:02                                     ` Masami Hiramatsu
2022-05-12 13:50                                       ` Steven Rostedt
2022-05-25 12:17                                       ` Mark Rutland
2022-05-25 13:43                                         ` Steven Rostedt
2022-05-25 17:12                                           ` Mark Rutland
2022-05-30  1:03                                         ` Masami Hiramatsu
2022-05-30 12:38                                           ` Jiri Olsa
2022-05-31  1:00                                             ` Masami Hiramatsu
2022-05-04 12:43               ` Mark Rutland
2022-05-05  2:57             ` Wangshaobo (bobo)
2022-05-25 12:27               ` Mark Rutland
2022-04-27  8:54       ` Wangshaobo (bobo)
2022-03-16 10:01 ` [RFC PATCH -next v2 4/4] arm64/ftrace: implement long jump for dynamic trampolines Wang ShaoBo
2022-04-21 13:47   ` Mark Rutland
2022-03-16 14:29 ` [RFC PATCH -next v2 0/4] arm64/ftrace: support dynamic trampoline Steven Rostedt
2022-04-20 18:11 ` Steven Rostedt
2022-04-21  1:13   ` Wangshaobo (bobo)
2022-04-21 12:37     ` Steven Rostedt
2022-05-25 12:45       ` Mark Rutland
2022-05-25 13:58         ` Steven Rostedt
2022-05-25 17:26           ` Mark Rutland
2022-04-21 12:53 ` Mark Rutland

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