missing: Pal/src/host/Linux/elf-x86_64.h

Pal/src/host/Linux/elf-x86_64.h

@@ -0,0 +1,79 @@
+/* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
+/* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
+
+/* Copyright (C) 2014 OSCAR lab, Stony Brook University
+   This file is part of Graphene Library OS.
+
+   Graphene Library OS is free software: you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation, either version 3 of the
+   License, or (at your option) any later version.
+
+   Graphene Library OS 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/*
+ * dl-machine-x86_64.h
+ *
+ * This files contain architecture-specific implementation of ELF dynamic
+ * relocation function.
+ * The source code is imported and modified from the GNU C Library.
+ */
+
+#define ELF_MACHINE_NAME "x86_64"
+
+#include <sys/param.h>
+#include <sysdep.h>
+#include <sysdeps/generic/ldsodefs.h>
+#include "pal_internal.h"
+
+/* Return the link-time address of _DYNAMIC.  Conveniently, this is the
+   first element of the GOT.  This must be inlined in a function which
+   uses global data.  */
+static inline Elf64_Addr __attribute__ ((unused))
+elf_machine_dynamic (void)
+{
+    Elf64_Addr addr;
+
+    /* This works because we have our GOT address available in the small PIC
+       model.  */
+    addr = (Elf64_Addr) &_DYNAMIC;
+
+    return addr;
+}
+
+/* Return the run-time load address of the shared object.  */
+static inline Elf64_Addr __attribute__ ((unused))
+elf_machine_load_address (void)
+{
+    Elf64_Addr addr;
+
+    /* The easy way is just the same as on x86:
+         leaq _dl_start, %0
+         leaq _dl_start(%%rip), %1
+         subq %0, %1
+       but this does not work with binutils since we then have
+       a R_X86_64_32S relocation in a shared lib.
+
+       Instead we store the address of _dl_start in the data section
+       and compare it with the current value that we can get via
+       an RIP relative addressing mode.  Note that this is the address
+       of _dl_start before any relocation performed at runtime.  In case
+       the binary is prelinked the resulting "address" is actually a
+       load offset which is zero if the binary was loaded at the address
+       it is prelinked for.  */
+
+    asm ("leaq " XSTRINGIFY(_ENTRY) "(%%rip), %0\n\t"
+         "subq 1f(%%rip), %0\n\t"
+         ".section\t.data.rel.ro\n"
+         "1:\t.quad " XSTRINGIFY(_ENTRY) "\n\t"
+         ".previous\n\t"
+         : "=r" (addr) : : "cc");
+
+    return addr;
+}