Add arm-nacl port.

git-mirror · Apr 17, 2015 · d1e44df1fa5fefd8a083f6c1e909bbcdc97c6438 · d1e44df
1 parent f709259
commit d1e44df1fa5fefd8a083f6c1e909bbcdc97c6438
diff --git a/ChangeLog b/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

diff --git a/abi-tags b/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.
diff --git a/sysdeps/arm/nacl/Implies b/sysdeps/arm/nacl/Implies
@@ -0,0 +1,2 @@
+  
+arm/nptl
+  
+init_array
diff --git a/sysdeps/arm/nacl/Makefile b/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
diff --git a/sysdeps/arm/nacl/____longjmp_chk.S b/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>
diff --git a/sysdeps/arm/nacl/aeabi_read_tp.S b/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)
diff --git a/sysdeps/arm/nacl/arm-features.h b/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 */
diff --git a/sysdeps/arm/nacl/dl-machine.h b/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