summaryrefslogtreecommitdiff
path: root/ldso/ldso/aarch64/dl-sysdep.h
diff options
context:
space:
mode:
Diffstat (limited to 'ldso/ldso/aarch64/dl-sysdep.h')
-rw-r--r--ldso/ldso/aarch64/dl-sysdep.h107
1 files changed, 107 insertions, 0 deletions
diff --git a/ldso/ldso/aarch64/dl-sysdep.h b/ldso/ldso/aarch64/dl-sysdep.h
new file mode 100644
index 000000000..4e8cdd906
--- /dev/null
+++ b/ldso/ldso/aarch64/dl-sysdep.h
@@ -0,0 +1,107 @@
+/*
+ * Various assembly language/system dependent hacks that are required
+ * so that we can minimize the amount of platform specific code.
+ * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2017 by Waldemar Brodkorb <wbx@uclibc-ng.org>
+ * Ported from GNU C Library
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1995-2016 Free Software Foundation, Inc.
+
+ 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/>. */
+
+/* Define this if the system uses RELOCA. */
+#define ELF_USES_RELOCA
+
+#include <elf.h>
+#include <link.h>
+
+/* Initialization sequence for the GOT. */
+#define INIT_GOT(GOT_BASE,MODULE) \
+{ \
+ GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \
+ GOT_BASE[1] = (unsigned long) MODULE; \
+}
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+#define MAGIC1 EM_AARCH64
+#undef MAGIC2
+
+/* Used for error messages */
+#define ELF_TARGET "aarch64"
+
+struct elf_resolve;
+unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
+
+#define elf_machine_type_class(type) \
+ ((((type) == R_AARCH64_JUMP_SLOT \
+ || (type) == R_AARCH64_TLS_DTPMOD \
+ || (type) == R_AARCH64_TLS_DTPREL \
+ || (type) == R_AARCH64_TLS_TPREL \
+ || (type) == R_AARCH64_TLSDESC) * ELF_RTYPE_CLASS_PLT) \
+ | (((type) == R_AARCH64_COPY) * ELF_RTYPE_CLASS_COPY))
+
+/* Return the link-time address of _DYNAMIC. Conveniently, this is the
+ first element of the GOT. */
+extern const ElfW(Addr) _GLOBAL_OFFSET_TABLE_[] attribute_hidden;
+static __always_inline ElfW(Addr) __attribute__ ((unused))
+elf_machine_dynamic (void)
+{
+ return _GLOBAL_OFFSET_TABLE_[0];
+}
+
+/* Return the run-time load address of the shared object. */
+
+static __always_inline ElfW(Addr) __attribute__ ((unused))
+elf_machine_load_address (void)
+{
+ /* To figure out the load address we use the definition that for any symbol:
+ dynamic_addr(symbol) = static_addr(symbol) + load_addr
+
+ The choice of symbol is arbitrary. The static address we obtain
+ by constructing a non GOT reference to the symbol, the dynamic
+ address of the symbol we compute using adrp/add to compute the
+ symbol's address relative to the PC.
+ This depends on 32/16bit relocations being resolved at link time
+ and that the static address fits in the 32/16 bits. */
+
+ ElfW(Addr) static_addr;
+ ElfW(Addr) dynamic_addr;
+
+ __asm__(" \n"
+" adrp %1, _dl_start; \n"
+" add %1, %1, #:lo12:_dl_start \n"
+" ldr %w0, 1f \n"
+" b 2f \n"
+"1: \n"
+" .word _dl_start \n"
+"2: \n"
+ : "=r" (static_addr), "=r" (dynamic_addr));
+ return dynamic_addr - static_addr;
+}
+
+static __always_inline void
+elf_machine_relative(Elf64_Addr load_off, const Elf64_Addr rel_addr,
+ Elf64_Word relative_count)
+{
+ Elf64_Rela *rpnt = (Elf64_Rela*)rel_addr;
+ --rpnt;
+ do {
+ Elf64_Addr *const reloc_addr = (Elf64_Addr*)(load_off + (++rpnt)->r_offset);
+
+ *reloc_addr = load_off + rpnt->r_addend;
+ } while (--relative_count);
+}