From patchwork Tue Sep 21 20:18:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: WANG Xuerui X-Patchwork-Id: 1530853 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=xen0n.name header.i=@xen0n.name header.a=rsa-sha256 header.s=mail header.b=g8TyHjNj; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4HDXqc4b9Zz9shn for ; Wed, 22 Sep 2021 06:20:43 +1000 (AEST) Received: from localhost ([::1]:43302 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mSmFs-00045R-LT for incoming@patchwork.ozlabs.org; Tue, 21 Sep 2021 16:20:40 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45292) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mSmEu-00042R-OV for qemu-devel@nongnu.org; Tue, 21 Sep 2021 16:19:41 -0400 Received: from [115.28.160.31] (port=55994 helo=mailbox.box.xen0n.name) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mSmEs-0000TS-5f for qemu-devel@nongnu.org; Tue, 21 Sep 2021 16:19:40 -0400 Received: from ld50.lan (unknown [101.88.29.172]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by mailbox.box.xen0n.name (Postfix) with ESMTPSA id 9CC8F633F8; Wed, 22 Sep 2021 04:19:26 +0800 (CST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=xen0n.name; s=mail; t=1632255566; bh=3oLxhl7nP2wXWycImvg28oHXfb5Kr/OWF5P/kgaiv34=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g8TyHjNj6L9rptjG/59hXAXgKKmBs93t4QTObW1krozXTeLTbcCKJ2RxFxe7hkd40 K4gLwwx/UFI3qNR+V+MN49R1MmRSmmNqV+gx91ltRkadc1TqU8WU8erd3D2zN+07mq kd+3VBgNj20d7kU3O6v+WlC4j2yjydtqkH/NVDKs= From: WANG Xuerui To: qemu-devel@nongnu.org Subject: [PATCH v2 07/30] tcg/loongarch64: Implement necessary relocation operations Date: Wed, 22 Sep 2021 04:18:52 +0800 Message-Id: <20210921201915.601245-8-git@xen0n.name> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210921201915.601245-1-git@xen0n.name> References: <20210921201915.601245-1-git@xen0n.name> MIME-Version: 1.0 X-Host-Lookup-Failed: Reverse DNS lookup failed for 115.28.160.31 (failed) Received-SPF: pass client-ip=115.28.160.31; envelope-from=git@xen0n.name; helo=mailbox.box.xen0n.name X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: WANG Xuerui Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: WANG Xuerui Reviewed-by: Richard Henderson --- tcg/loongarch64/tcg-target.c.inc | 66 ++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/tcg/loongarch64/tcg-target.c.inc b/tcg/loongarch64/tcg-target.c.inc index f0930f77ef..69e882ba5d 100644 --- a/tcg/loongarch64/tcg-target.c.inc +++ b/tcg/loongarch64/tcg-target.c.inc @@ -168,3 +168,69 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct) } return 0; } + +/* + * Relocations + */ + +/* + * Relocation records defined in LoongArch ELF psABI v1.00 is way too + * complicated; a whopping stack machine is needed to stuff the fields, at + * the very least one SOP_PUSH and one SOP_POP (of the correct format) are + * needed. + * + * Hence, define our own simpler relocation types. Numbers are chosen as to + * not collide with potential future additions to the true ELF relocation + * type enum. + */ + +/* Field Sk16, shifted right by 2; suitable for conditional jumps */ +#define R_LOONGARCH_BR_SK16 256 +/* Field Sd10k16, shifted right by 2; suitable for B and BL */ +#define R_LOONGARCH_BR_SD10K16 257 + +static bool reloc_br_sk16(tcg_insn_unit *src_rw, const tcg_insn_unit *target) +{ + const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw); + intptr_t offset = (intptr_t)target - (intptr_t)src_rx; + + tcg_debug_assert((offset & 3) == 0); + offset >>= 2; + if (offset == sextreg(offset, 0, 16)) { + *src_rw |= (offset << 10) & 0x3fffc00; + return true; + } + + return false; +} + +static bool reloc_br_sd10k16(tcg_insn_unit *src_rw, + const tcg_insn_unit *target) +{ + const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw); + intptr_t offset = (intptr_t)target - (intptr_t)src_rx; + + tcg_debug_assert((offset & 3) == 0); + offset >>= 2; + if (offset == sextreg(offset, 0, 26)) { + *src_rw |= (offset >> 16) & 0x3ff; /* slot d10 */ + *src_rw |= ((offset & 0xffff) << 10) & 0x3fffc00; /* slot k16 */ + return true; + } + + return false; +} + +static bool patch_reloc(tcg_insn_unit *code_ptr, int type, + intptr_t value, intptr_t addend) +{ + tcg_debug_assert(addend == 0); + switch (type) { + case R_LOONGARCH_BR_SK16: + return reloc_br_sk16(code_ptr, (tcg_insn_unit *)value); + case R_LOONGARCH_BR_SD10K16: + return reloc_br_sd10k16(code_ptr, (tcg_insn_unit *)value); + default: + g_assert_not_reached(); + } +}