From: vineet.gupta1@synopsys.com (Vineet Gupta)
To: linux-snps-arc@lists.infradead.org
Subject: [PATCH v2 09/15] ARC: Linux Startup and Dynamic Loading
Date: Tue, 29 Jan 2019 17:25:49 -0800 [thread overview]
Message-ID: <1548811555-24373-10-git-send-email-vgupta@synopsys.com> (raw)
In-Reply-To: <1548811555-24373-1-git-send-email-vgupta@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta at synopsys.com>
---
ChangeLog | 2 +
sysdeps/unix/sysv/linux/arc/dl-static.c | 84 +++++++++++++++++++++++++++++++++
sysdeps/unix/sysv/linux/arc/ldsodefs.h | 32 +++++++++++++
3 files changed, 118 insertions(+)
create mode 100644 sysdeps/unix/sysv/linux/arc/dl-static.c
create mode 100644 sysdeps/unix/sysv/linux/arc/ldsodefs.h
diff --git a/ChangeLog b/ChangeLog
index e0f2c3372e31..017bced57129 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -67,6 +67,8 @@
* sysdeps/unix/sysv/linux/arc/sys/user.h: New file.
* sysdeps/unix/sysv/linux/arc/ucontext-macros.h: New file.
* sysdeps/unix/sysv/linux/arc/ucontext_i.sym: New file.
+ * sysdeps/unix/sysv/linux/arc/dl-static.c: New file.
+ * sysdeps/unix/sysv/linux/arc/ldsodefs.h: New file.
2019-01-25 Siddhesh Poyarekar <siddhesh at sourceware.org>
diff --git a/sysdeps/unix/sysv/linux/arc/dl-static.c b/sysdeps/unix/sysv/linux/arc/dl-static.c
new file mode 100644
index 000000000000..1a8757c9840d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arc/dl-static.c
@@ -0,0 +1,84 @@
+/* Variable initialization. ARC version.
+ Copyright (C) 2001-2019 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <ldsodefs.h>
+
+#ifdef SHARED
+
+void
+_dl_var_init (void *array[])
+{
+ /* It has to match "variables" below. */
+ enum
+ {
+ DL_PAGESIZE = 0
+ };
+
+ GLRO(dl_pagesize) = *((size_t *) array[DL_PAGESIZE]);
+}
+
+#else
+
+static void *variables[] =
+{
+ &GLRO(dl_pagesize)
+};
+
+static void
+_dl_unprotect_relro (struct link_map *l)
+{
+ ElfW(Addr) start = ((l->l_addr + l->l_relro_addr)
+ & ~(GLRO(dl_pagesize) - 1));
+ ElfW(Addr) end = ((l->l_addr + l->l_relro_addr + l->l_relro_size)
+ & ~(GLRO(dl_pagesize) - 1));
+
+ if (start != end)
+ __mprotect ((void *) start, end - start, PROT_READ | PROT_WRITE);
+}
+
+void
+_dl_static_init (struct link_map *l)
+{
+ struct link_map *rtld_map = l;
+ struct r_scope_elem **scope;
+ const ElfW(Sym) *ref = NULL;
+ lookup_t loadbase;
+ void (*f) (void *[]);
+ size_t i;
+
+ loadbase = _dl_lookup_symbol_x ("_dl_var_init", l, &ref, l->l_local_scope,
+ NULL, 0, 1, NULL);
+
+ for (scope = l->l_local_scope; *scope != NULL; scope++)
+ for (i = 0; i < (*scope)->r_nlist; i++)
+ if ((*scope)->r_list[i] == loadbase)
+ {
+ rtld_map = (*scope)->r_list[i];
+ break;
+ }
+
+ if (ref != NULL)
+ {
+ f = (void (*) (void *[])) DL_SYMBOL_ADDRESS (loadbase, ref);
+ _dl_unprotect_relro (rtld_map);
+ f (variables);
+ _dl_protect_relro (rtld_map);
+ }
+}
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/arc/ldsodefs.h b/sysdeps/unix/sysv/linux/arc/ldsodefs.h
new file mode 100644
index 000000000000..8c5c6800af13
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arc/ldsodefs.h
@@ -0,0 +1,32 @@
+/* Run-time dynamic linker data structures for loaded ELF shared objects. ARC
+ Copyright (C) 2001-2019 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _LDSODEFS_H
+
+/* Get the real definitions. */
+#include_next <ldsodefs.h>
+
+/* Now define our stuff. */
+
+/* We need special support to initialize DSO loaded for statically linked
+ binaries. */
+extern void _dl_static_init (struct link_map *map);
+#undef DL_STATIC_INIT
+#define DL_STATIC_INIT(map) _dl_static_init (map)
+
+#endif /* ldsodefs.h */
--
2.7.4
next prev parent reply other threads:[~2019-01-30 1:25 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-30 1:25 [PATCH v2 00/15] glibc port to ARC processors Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 01/15] ARC: add definitions to elf/elf.h Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 02/15] ARC: ABI Implementation Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 03/15] ARC: startup and dynamic linking code Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 04/15] ARC: Thread Local Storage support Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 05/15] ARC: Atomics and Locking primitives Vineet Gupta
2019-01-30 8:28 ` Andreas Schwab
2019-01-30 17:40 ` Vineet Gupta
2019-02-01 1:57 ` Need for arch pthread-offsets.h (was Re: [PATCH v2 05/15] ARC: Atomics and Locking primitives) Vineet Gupta
2019-02-04 10:02 ` Andreas Schwab
2019-01-30 21:04 ` [PATCH v2 05/15] ARC: Atomics and Locking primitives Joseph Myers
2019-01-30 21:35 ` Vineet Gupta
2019-01-30 21:50 ` Joseph Myers
2019-01-30 22:02 ` Vineet Gupta
2019-01-30 22:05 ` Joseph Myers
2019-01-30 1:25 ` [PATCH v2 06/15] ARC: math soft float support Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 07/15] ARC: Linux Syscall Interface Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 08/15] ARC: Linux ABI Vineet Gupta
2019-01-30 1:25 ` Vineet Gupta [this message]
2019-01-30 1:25 ` [PATCH v2 10/15] ARC: ABI lists Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 11/15] ARC: Update syscall-names.list for ARC specific syscalls Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 12/15] ARC: Build Infrastructure Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 13/15] build-many-glibcs.py: Enable ARC builds Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 14/15] NEWS: mention ARC port Vineet Gupta
2019-01-30 1:25 ` [PATCH v2 15/15] make-syscalls.sh: fix comment referencing syscall-template Vineet Gupta
2019-01-30 2:20 ` Joseph Myers
2019-01-30 2:29 ` [PATCH v2 00/15] glibc port to ARC processors Joseph Myers
2019-01-30 18:15 ` Vineet Gupta
2019-01-30 21:19 ` Joseph Myers
2020-01-17 19:34 ` ARCv2 Public PRM (was Re: [PATCH v2 00/15] glibc port to ARC processors) Vineet Gupta
2020-01-17 21:56 ` Joseph Myers
2020-02-06 17:19 ` Vineet Gupta
2020-02-06 21:51 ` Joseph Myers
2020-02-06 22:06 ` Alistair Francis
2020-02-06 22:41 ` Vineet Gupta
2020-02-09 12:27 ` Lukasz Majewski
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