Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752601Ab3JQGat (ORCPT ); Thu, 17 Oct 2013 02:30:49 -0400 Received: from mail-pa0-f43.google.com ([209.85.220.43]:57877 "EHLO mail-pa0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751143Ab3JQGas (ORCPT ); Thu, 17 Oct 2013 02:30:48 -0400 From: Jiang Liu To: Steven Rostedt , Catalin Marinas , Will Deacon , Sandeepa Prabhu , Jiang Liu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Jiang Liu Subject: [PATCH v4 4/7] arm64: introduce aarch64_insn_gen_{nop|branch_imm}() helper functions Date: Thu, 17 Oct 2013 14:19:37 +0800 Message-Id: <1381990781-27814-5-git-send-email-liuj97@gmail.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1381990781-27814-1-git-send-email-liuj97@gmail.com> References: <1381990781-27814-1-git-send-email-liuj97@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2659 Lines: 81 From: Jiang Liu Introduce aarch64_insn_gen_{nop|branch_imm}() helper functions, which will be used to implement jump label on ARM64. Signed-off-by: Jiang Liu Cc: Jiang Liu --- arch/arm64/include/asm/insn.h | 7 +++++++ arch/arm64/kernel/insn.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h index d62b601..ac129a8 100644 --- a/arch/arm64/include/asm/insn.h +++ b/arch/arm64/include/asm/insn.h @@ -94,6 +94,13 @@ static __always_inline void aarch64_insn_write(void *addr, u32 insn) enum aarch64_insn_encoding_class aarch64_get_insn_class(u32 insn); u32 aarch64_insn_encode_immediate(enum aarch64_insn_imm_type type, u32 insn, u64 imm); +u32 aarch64_insn_gen_branch_imm(unsigned long pc, unsigned long addr, + bool link); +static __always_inline u32 aarch64_insn_gen_nop(void) +{ + return aarch64_insn_get_nop_value(); +} + bool aarch64_insn_hotpatch_safe(u32 old_insn, u32 new_insn); int aarch64_insn_patch_text_nosync(void *addrs[], u32 insns[], int cnt); diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c index 344d23ed..a59f71d 100644 --- a/arch/arm64/kernel/insn.c +++ b/arch/arm64/kernel/insn.c @@ -14,6 +14,7 @@ * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ +#include #include #include #include @@ -205,3 +206,30 @@ u32 aarch64_insn_encode_immediate(enum aarch64_insn_imm_type type, return insn; } + +u32 aarch64_insn_gen_branch_imm(unsigned long pc, unsigned long addr, bool link) +{ + u32 insn; + long offset; + + /* + * PC: A 64-bit Program Counter holding the address of the current + * instruction. A64 instructions may be word-aligned. + */ + BUG_ON((pc & 0x3) || (addr & 0x3)); + + /* + * B/BL support [-128M, 128M) offset + * ARM64 virtual address arrangement garantees all kernel and module + * texts are within +/-128M. + */ + offset = ((long)addr - (long)pc) >> 2; + BUG_ON(abs(offset) > BIT(25) || offset == BIT(25)); + + if (link) + insn = aarch64_insn_get_bl_value(); + else + insn = aarch64_insn_get_b_value(); + + return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_26, insn, offset); +} -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/