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Fri, 29 May 2020 21:21:50 +0000 (UTC) X-SNPS-Relay: synopsys.com From: Vineet Gupta To: libc-alpha@sourceware.org Subject: [PATCH 2/2] ARC/dl-runtime helper macros Date: Fri, 29 May 2020 14:21:42 -0700 Message-Id: <20200529212142.19869-2-vgupta@synopsys.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200529212142.19869-1-vgupta@synopsys.com> References: <9ec385e5-3427-f3ac-f4c8-73f0c98aaa97@linaro.org> <20200529212142.19869-1-vgupta@synopsys.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200529_142152_465577_9F7B9F40 X-CRM114-Status: GOOD ( 12.04 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RCVD_IN_MSPIKE_H4 RBL: Very Good reputation (+4) [149.117.73.133 listed in wl.mailspike.net] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vineet Gupta , linux-snps-arc@lists.infradead.org, Adhemerval Zanella Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org This is purely for review purposes to attest the interface defined in prior patch --- sysdeps/arc/dl-runtime.h | 42 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 sysdeps/arc/dl-runtime.h diff --git a/sysdeps/arc/dl-runtime.h b/sysdeps/arc/dl-runtime.h new file mode 100644 index 000000000000..529d49f5d0a1 --- /dev/null +++ b/sysdeps/arc/dl-runtime.h @@ -0,0 +1,42 @@ +/* Helpers for On-demand PLT fixup for shared objects. ARC version. + Copyright (C) 2017-2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + . */ + +/* PLT jump into resolver passes PC of PLTn, while _dl_fixup expects the + address of corresponding .rela.plt entry. + + - @plt0: runtime pc of first plt entry (DT_PLTGOT) + - @pltn: runtime pc of plt entry being resolved + - @size: size of .plt.rela entry (unused). */ +static inline uintptr_t +reloc_index (uintptr_t plt0, uintptr_t pltn, size_t size) +{ + unsigned long int idx = (unsigned long)pltn - (unsigned long)plt0; + + /* PLT trampoline is 16 bytes. */ + idx /= 16; + + /* Exclude PLT0 and PLT1. */ + return idx - 2; +} + +static inline uintptr_t +reloc_offset (uintptr_t plt0, uintptr_t pltn) +{ + size_t sz = sizeof (ElfW(Rela)); + return reloc_index(plt0, pltn, sz) * sz; +}