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Sat, 30 May 2020 02:00:50 +0000 (UTC) X-SNPS-Relay: synopsys.com From: Vineet Gupta To: libc-alpha@sourceware.org Subject: [PATCH 1/5] ARC/dl-runtime helper macros Date: Fri, 29 May 2020 19:00:43 -0700 Message-Id: <20200530020047.5490-2-vgupta@synopsys.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200530020047.5490-1-vgupta@synopsys.com> References: <20200530020047.5490-1-vgupta@synopsys.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200529_190053_735109_1510FFC5 X-CRM114-Status: GOOD ( 11.84 ) 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+linux-snps-arc=archiver.kernel.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; +} -- 2.20.1 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc