Add arm-nacl port.

ChangeLog

@@ -1,3 +1,10 @@
+2015-04-17  Roland McGrath  <roland@hack.frob.com>
+
+	Add preliminary port to Google Native Client on ARM.
+	* abi-tags (.*-.*-nacl.*): New entry.
+	* sysdeps/arm/nacl: New directory.
+	* sysdeps/nacl: New directory.
+
 2015-04-16  David S. Miller  <davem@davemloft.net>
 
 	* sysdeps/unix/sysv/linux/sparc/lowlevellock.h: Make use of

abi-tags

@@ -28,5 +28,7 @@
 
 .*-.*-syllable.*	5	2.0.0	# just an arbitrary value
 
+.*-.*-nacl.*		6	42.0.0	# earliest compatible Chromium version
+
 # There is no catch-all default here because every supported OS that uses
 # ELF must have its own unique ABI tag.

sysdeps/arm/nacl/Implies

@@ -0,0 +1,2 @@
+arm/nptl
+init_array

sysdeps/arm/nacl/Makefile

@@ -0,0 +1,33 @@
+# Makefile fragment for ARM/NaCl configurations.
+
+# Copyright (C) 2015 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/>.
+
+# sysdeps/nacl/Makefile needs this set to the architecture suffix used in
+# the NaCl SDK.
+nacl-sdk-arch = arm
+
+# We don't really support TLSDESC, even though the compiler thinks it does.
+have-arm-tls-desc = no
+
+ifeq ($(subdir),csu)
+sysdep_routines += aeabi_read_tp
+endif
+
+ifeq ($(subdir),elf)
+sysdep-rtld-routines += aeabi_read_tp
+endif

sysdeps/arm/nacl/____longjmp_chk.S

@@ -0,0 +1,47 @@
+/* longjmp that validates stack addresses.  ARM/NaCl version.
+   Copyright (C) 2015 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 <sysdep.h>
+
+	.section .rodata.str1.1,"aMS",%progbits,1
+	.type	longjmp_msg,%object
+longjmp_msg:
+	.string "longjmp causes uninitialized stack frame"
+	.size	longjmp_msg, .-longjmp_msg
+
+	.text
+
+/* We don't have sigaltstack and so any longjmp must be to an outer frame.  */
+.macro check_sp reg
+	cmp sp, \reg
+	bls .Lok
+#ifdef PIC
+	movw r0, #:lower16:longjmp_msg-(.LPIC0+8)
+	movt r0, #:upper16:longjmp_msg-(.LPIC0+8)
+.LPIC0:	add r0, r0, pc
+#else
+	movw r0, #:lower16:longjmp_msg
+	movt r0, #:upper16:longjmp_msg
+#endif
+	b HIDDEN_JUMPTARGET(__fortify_fail)
+.Lok:
+.endm
+
+#define CHECK_SP(reg)	check_sp reg
+#define __longjmp	____longjmp_chk
+#include <__longjmp.S>

sysdeps/arm/nacl/aeabi_read_tp.S

@@ -0,0 +1,44 @@
+/* ARM EABI helper function for reading the thread pointer.  NaCl version.
+   Copyright (C) 2015 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.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file. (The GNU Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so. The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   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 <sysdep.h>
+
+/* GCC will emit calls to this routine under -mtp=soft.  */
+
+	.hidden __aeabi_read_tp
+ENTRY (__aeabi_read_tp)
+	ldr	r0, [r9]
+	sfi_bx	lr
+END (__aeabi_read_tp)

sysdeps/arm/nacl/arm-features.h

@@ -0,0 +1,43 @@
+/* Macros to test for CPU features on ARM.  NaCl version.
+   Copyright (C) 2015 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 _NACL_ARM_FEATURES_H
+#define _NACL_ARM_FEATURES_H 1
+
+#ifdef __SOFTFP__
+# error NaCl should always have VFP enabled
+#endif
+
+/* NaCl does not support iWMMXt at all.  */
+#define ARM_ASSUME_NO_IWMMXT    1
+
+/* NaCl does not allow instructions to target the pc register.  */
+#define ARM_ALWAYS_BX           1
+
+/* Computed branch targets must be bundle-aligned, which is to 16 bytes.  */
+#define ARM_BX_ALIGN_LOG2       4
+
+/* Two-register addressing modes are never allowed.  */
+#define ARM_NO_INDEX_REGISTER   1
+
+/* Only ARM mode code is allowed, never Thumb mode.  */
+#define NO_THUMB
+
+#include_next <arm-features.h>
+
+#endif  /* arm-features.h */

sysdeps/arm/nacl/dl-machine.h

@@ -0,0 +1,53 @@
+/* Machine-dependent ELF dynamic relocation inline functions.  ARM/NaCl version.
+   Copyright (C) 2015 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 dl_machine_h
+
+/* This is only needed for handling TEXTRELs and NaCl will never
+   support TEXTRELs at all.  */
+#define CLEAR_CACHE(start, end) __builtin_trap ()
+
+#endif
+
+/* The rest is just machine-specific.
+   This #include is outside the #ifndef because the parts of
+   dl-machine.h used only by dynamic-link.h are outside the guard.  */
+#include <sysdeps/arm/dl-machine.h>
+
+#ifdef dl_machine_h
+
+/* Initial entry point code for the dynamic linker.
+   The C function `_dl_start' is the real entry point;
+   its return value is the user program's entry point.  */
+#undef RTLD_START
+#define RTLD_START asm ("\
+.text\n\
+.globl _start\n\
+.type _start, %function\n\
+.p2align 4\n\
+_start:\n\
+	@ r0 has the pointer to the info block (see nacl_startup.h)\n\
+	mov r1, sp              @ Save stack base for __libc_stack_end.\n\
+	push {r0-r3}            @ Push those, maintaining alignment to 16.\n\
+	mov r0, sp              @ Pointer to {info, sp} is argument.\n\
+	sfi_bl _dl_start\n\
+	pop {r1-r4}             @ Restore stack, getting info block into r1.\n\
+	mov lr, #0              @ Return address for noreturn call.\n\
+	b _dl_start_user");
+
+#endif