From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1944) id 75B033861832; Wed, 12 Oct 2022 14:18:32 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 75B033861832 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1665584312; bh=/P4mqPweqsS1ufOVkNNHzXgeXJmVr+E5j4IajEDryns=; h=From:To:Subject:Date:From; b=TKsWyNUPFkD3mDEZ9NQl8O0XMpnT7dN1gPWo1TE8IHVmz9wlga7JT86zO52/g+yM2 YlrwrDOksQte3aAwkFJFU7H8RD+kLstkNYCxgu9xaStGrQdrQseDXA3mk1w4NaV91Z MIsyeZtPmv9Mm1w8n1CXP1d9xamUpMBr06dxRRik= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Szabolcs Nagy To: glibc-cvs@sourceware.org Subject: [glibc/arm/morello/main] aarch64: morello: add dl-r_debug.h X-Act-Checkin: glibc X-Git-Author: Szabolcs Nagy X-Git-Refname: refs/heads/arm/morello/main X-Git-Oldrev: bbfb104b5087108bc2068d0c2b60391b636b9b48 X-Git-Newrev: 0648dbf3a02cf39029c206d7e6003bb2ec1dce0c Message-Id: <20221012141832.75B033861832@sourceware.org> Date: Wed, 12 Oct 2022 14:18:32 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0648dbf3a02cf39029c206d7e6003bb2ec1dce0c commit 0648dbf3a02cf39029c206d7e6003bb2ec1dce0c Author: Szabolcs Nagy Date: Wed Sep 14 11:25:55 2022 +0100 aarch64: morello: add dl-r_debug.h Used internally for r_debug tests, but with the assumption that the return value can be dereferenced, so change the prototype and return a valid capability. Also used in pldd, where we only support purecap abi processes. Diff: --- sysdeps/aarch64/morello/dl-r_debug.h | 61 ++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/sysdeps/aarch64/morello/dl-r_debug.h b/sysdeps/aarch64/morello/dl-r_debug.h new file mode 100644 index 0000000000..827609ff76 --- /dev/null +++ b/sysdeps/aarch64/morello/dl-r_debug.h @@ -0,0 +1,61 @@ +/* Function to access r_debug structure. Morello version. + Copyright (C) 2022 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 + . */ + +#include +#include + +static int +E(callback) (struct dl_phdr_info *info, size_t size, void *data) +{ + /* Assume phdr covers the load segments. */ + const void *phdr = info->dlpi_phdr; + uintptr_t *p = data; + unsigned long addr = *p; + unsigned long base = __builtin_cheri_base_get (phdr); + unsigned long len = __builtin_cheri_length_get (phdr); + if (addr - base >= len) + return 0; + *p = __builtin_cheri_address_set ((uintptr_t) phdr, addr); + return 1; +} + +/* Return a valid runtime pointer to r_debug instead of an address since + that's how this function is used despite its generic prototype. + Assume the lookup is for the main exe and return uintptr_t type. */ + +static inline uintptr_t +E(r_debug_address) (ElfW(Dyn) *d) +{ + if (d->d_tag != DT_DEBUG) + return 0; + uintptr_t p = d->d_un.d_ptr; + if (dl_iterate_phdr (E(callback), &p) == 1) + return p; + return 0; +} + +/* Return the offset of the struct r_debug before relocation. */ + +static inline EW(Addr) +E(r_debug_offset) (EW(Dyn) *d, int fd, EW(Addr) offset) +{ + if (d->d_tag == DT_DEBUG) + return (EW(Addr)) d->d_un.d_ptr; + + return 0; +}