Relocate AArch64 from ports to libc.

This patch moves the AArch64 port to the main sysdeps hierarchy.  The
move is essentially:

  git mv ports/sysdeps/aarch64 sysdeps/aarch64
  git mv ports/sysdeps/unix/sysv/linux/aarch64 sysdeps/unix/sysv/linux/aarch64

The README is updated and I've updated ChangeLog.aarch64 along the
lines of the ARM move.  The AArch64 build has been tested to confirm
that there were no changes in objdump -dr output or the shared
objects.

1 files changed, 296 insertions, 0 deletions

diff --git a/sysdeps/aarch64/dl-trampoline.S b/sysdeps/aarch64/dl-trampoline.S
new file mode 100644
index 0000000000..2037f18276
--- /dev/null
+++ b/sysdeps/aarch64/dl-trampoline.S
@@ -0,0 +1,296 @@
+/* Copyright (C) 2005-2014 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>
+#include <libc-symbols.h>
+
+#include "dl-link.h"
+
+#define ip0 x16
+#define ip1 x17
+#define lr  x30
+
+	.text
+	.globl _dl_runtime_resolve
+	.type _dl_runtime_resolve, #function
+	cfi_startproc
+	.align 2
+_dl_runtime_resolve:
+	/* AArch64 we get called with:
+	   ip0		&PLTGOT[2]
+	   ip1		temp(dl resolver entry point)
+	   [sp, #8]	lr
+	   [sp, #0]	&PLTGOT[n]
+	 */
+
+	cfi_rel_offset (lr, 8)
+
+	/* Save arguments.  */
+	stp	x8, x9, [sp, #-(80+8*16)]!
+	cfi_adjust_cfa_offset (80+8*16)
+	cfi_rel_offset (x8, 0)
+	cfi_rel_offset (x9, 8)
+
+	stp	x6, x7, [sp,  #16]
+	cfi_rel_offset (x6, 16)
+	cfi_rel_offset (x7, 24)
+
+	stp	x4, x5, [sp,  #32]
+	cfi_rel_offset (x4, 32)
+	cfi_rel_offset (x5, 40)
+
+	stp	x2, x3, [sp,  #48]
+	cfi_rel_offset (x2, 48)
+	cfi_rel_offset (x3, 56)
+
+	stp	x0, x1, [sp,  #64]
+	cfi_rel_offset (x0, 64)
+	cfi_rel_offset (x1, 72)
+
+	stp	q0, q1, [sp, #(80+0*16)]
+	cfi_rel_offset (q0, 80+0*16)
+	cfi_rel_offset (q1, 80+1*16)
+
+	stp	q2, q3, [sp, #(80+2*16)]
+	cfi_rel_offset (q0, 80+2*16)
+	cfi_rel_offset (q1, 80+3*16)
+
+	stp	q4, q5, [sp, #(80+4*16)]
+	cfi_rel_offset (q0, 80+4*16)
+	cfi_rel_offset (q1, 80+5*16)
+
+	stp	q6, q7, [sp, #(80+6*16)]
+	cfi_rel_offset (q0, 80+6*16)
+	cfi_rel_offset (q1, 80+7*16)
+
+	/* Get pointer to linker struct.  */
+	ldr	x0, [ip0, #-8]
+
+	/* Prepare to call _dl_fixup().  */
+	ldr	x1, [sp, 80+8*16]	/* Recover &PLTGOT[n] */
+
+	sub     x1, x1, ip0
+	add     x1, x1, x1, lsl #1
+	lsl     x1, x1, #3
+	sub     x1, x1, #192
+	lsr     x1, x1, #3
+
+	/* Call fixup routine.  */
+	bl	_dl_fixup
+
+	/* Save the return.  */
+	mov	ip0, x0
+
+	/* Get arguments and return address back.  */
+	ldp	q0, q1, [sp, #(80+0*16)]
+	ldp	q2, q3, [sp, #(80+2*16)]
+	ldp	q4, q5, [sp, #(80+4*16)]
+	ldp	q6, q7, [sp, #(80+6*16)]
+	ldp	x0, x1, [sp, #64]
+	ldp	x2, x3, [sp, #48]
+	ldp	x4, x5, [sp, #32]
+	ldp	x6, x7, [sp, #16]
+	ldp	x8, x9, [sp], #(80+8*16)
+	cfi_adjust_cfa_offset (-(80+8*16))
+
+	ldp	ip1, lr, [sp], #16
+	cfi_adjust_cfa_offset (-16)
+
+	/* Jump to the newly found address.  */
+	br	ip0
+
+	cfi_endproc
+	.size _dl_runtime_resolve, .-_dl_runtime_resolve
+#ifndef PROF
+	.globl _dl_runtime_profile
+	.type _dl_runtime_profile, #function
+	cfi_startproc
+	.align 2
+_dl_runtime_profile:
+	/* AArch64 we get called with:
+	   ip0		&PLTGOT[2]
+	   ip1		temp(dl resolver entry point)
+	   [sp, #8]	lr
+	   [sp, #0]	&PLTGOT[n]
+
+	   Stack frame layout:
+	   [sp,   #...] lr
+	   [sp,   #...] &PLTGOT[n]
+	   [sp,    #96] La_aarch64_regs
+	   [sp,    #48] La_aarch64_retval
+	   [sp,    #40] frame size return from pltenter
+	   [sp,    #32] dl_profile_call saved x1
+	   [sp,    #24] dl_profile_call saved x0
+	   [sp,    #16] t1
+	   [sp,     #0] x29, lr   <- x29
+	 */
+
+# define OFFSET_T1		16
+# define OFFSET_SAVED_CALL_X0	OFFSET_T1 + 8
+# define OFFSET_FS		OFFSET_SAVED_CALL_X0 + 16
+# define OFFSET_RV		OFFSET_FS + 8
+# define OFFSET_RG		OFFSET_RV + DL_SIZEOF_RV
+
+# define SF_SIZE		OFFSET_RG + DL_SIZEOF_RG
+
+# define OFFSET_PLTGOTN		SF_SIZE
+# define OFFSET_LR		OFFSET_PLTGOTN + 8
+
+	/* Save arguments.  */
+	sub	sp, sp, #SF_SIZE
+	cfi_adjust_cfa_offset (SF_SIZE)
+	stp	x29, x30, [SP, #0]
+	mov	x29, sp
+	cfi_def_cfa_register (x29)
+	cfi_rel_offset (x29, 0)
+	cfi_rel_offset (lr, 8)
+
+	stp	x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*0]
+	cfi_rel_offset (x0, OFFSET_RG + DL_OFFSET_RG_X0 + 16*0 + 0)
+	cfi_rel_offset (x1, OFFSET_RG + DL_OFFSET_RG_X0 + 16*0 + 8)
+	stp	x2, x3, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*1]
+	cfi_rel_offset (x2, OFFSET_RG + DL_OFFSET_RG_X0 + 16*1 + 0)
+	cfi_rel_offset (x3, OFFSET_RG + DL_OFFSET_RG_X0 + 16*1 + 8)
+	stp	x4, x5, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*2]
+	cfi_rel_offset (x4, OFFSET_RG + DL_OFFSET_RG_X0 + 16*2 + 0)
+	cfi_rel_offset (x5, OFFSET_RG + DL_OFFSET_RG_X0 + 16*2 + 8)
+	stp	x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3]
+	cfi_rel_offset (x6, OFFSET_RG + DL_OFFSET_RG_X0 + 16*3 + 0)
+	cfi_rel_offset (x7, OFFSET_RG + DL_OFFSET_RG_X0 + 16*3 + 8)
+
+	stp	d0, d1, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0]
+	cfi_rel_offset (d0, OFFSET_RG + DL_OFFSET_RG_D0 + 16*0)
+	cfi_rel_offset (d1, OFFSET_RG + DL_OFFSET_RG_D0 + 16*0 + 8)
+	stp	d2, d3, [X29, #OFFSET_RG+ DL_OFFSET_RG_D0 + 16*1]
+	cfi_rel_offset (d2, OFFSET_RG + DL_OFFSET_RG_D0 + 16*1 + 0)
+	cfi_rel_offset (d3, OFFSET_RG + DL_OFFSET_RG_D0 + 16*1 + 8)
+	stp	d4, d5, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2]
+	cfi_rel_offset (d4, OFFSET_RG + DL_OFFSET_RG_D0 + 16*2 + 0)
+	cfi_rel_offset (d5, OFFSET_RG + DL_OFFSET_RG_D0 + 16*2 + 8)
+	stp	d6, d7, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3]
+	cfi_rel_offset (d6, OFFSET_RG + DL_OFFSET_RG_D0 + 16*3 + 0)
+	cfi_rel_offset (d7, OFFSET_RG + DL_OFFSET_RG_D0 + 16*3 + 8)
+
+	add     x0, x29, #SF_SIZE + 16
+	ldr	x1, [x29, #OFFSET_LR]
+	stp	x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_SP]
+
+	/* Get pointer to linker struct.  */
+	ldr	x0, [ip0, #-8]
+
+	/* Prepare to call _dl_profile_fixup().  */
+	ldr	x1, [x29, OFFSET_PLTGOTN]	/* Recover &PLTGOT[n] */
+
+	sub     x1, x1, ip0
+	add     x1, x1, x1, lsl #1
+	lsl     x1, x1, #3
+	sub     x1, x1, #192
+	lsr     x1, x1, #3
+
+	stp	x0, x1, [x29, #OFFSET_SAVED_CALL_X0]
+
+	/* Set up extra args for _dl_profile_fixup */
+	ldr	x2, [x29, #OFFSET_LR]		/* load saved LR */
+	add	x3, x29, #OFFSET_RG		/* address of La_aarch64_reg */
+	add	x4, x29, #OFFSET_FS		/* address of framesize */
+	bl	_dl_profile_fixup
+
+	ldr	ip0, [x29, #OFFSET_FS]		/* framesize == 0 */
+	cmp	ip0, #0
+	bge	1f
+	cfi_remember_state
+
+	/* Save the return.  */
+	mov	ip0, x0
+
+	/* Get arguments and return address back.  */
+	ldp	x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*0]
+	ldp	x2, x3, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*1]
+	ldp	x4, x5, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*2]
+	ldp	x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3]
+	ldp	d0, d1, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0]
+	ldp	d2, d3, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*1]
+	ldp	d4, d5, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2]
+	ldp	d6, d7, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3]
+
+	cfi_def_cfa_register (sp)
+	ldp	x29, x30, [x29, #0]
+	cfi_restore(x29)
+	cfi_restore(x30)
+
+	add	sp, sp, SF_SIZE + 16
+	cfi_adjust_cfa_offset (- SF_SIZE - 16)
+
+	/* Jump to the newly found address.  */
+	br	ip0
+
+	cfi_restore_state
+1:
+	/* The new frame size is in ip0.  */
+
+	sub	x1, x29, ip0
+	and	sp, x1, #0xfffffffffffffff0
+
+	str	x0, [x29, #OFFSET_T1]
+
+	mov	x0, sp
+	add	x1, x29, #SF_SIZE + 16
+	mov	x2, ip0
+	bl	memcpy
+
+	ldr	ip0, [x29, #OFFSET_T1]
+
+	/* Call the function.  */
+	ldp	x0, x1, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*0]
+	ldp	x2, x3, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*1]
+	ldp	x4, x5, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*2]
+	ldp	x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3]
+	ldp	d0, d1, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0]
+	ldp	d2, d3, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*1]
+	ldp	d4, d5, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2]
+	ldp	d6, d7, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3]
+	blr	ip0
+	stp	x0, x1, [x29, #OFFSET_RV + DL_OFFSET_RV_X0]
+	stp	d0, d1, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*0]
+	stp	d2, d3, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*1]
+
+	/* Setup call to pltexit  */
+	ldp	x0, x1, [x29, #OFFSET_SAVED_CALL_X0]
+	add	x2, x29, #OFFSET_RG
+	add	x3, x29, #OFFSET_RV
+	bl	_dl_call_pltexit
+
+	ldp	x0, x1, [x29, #OFFSET_RV + DL_OFFSET_RV_X0]
+	ldp	d0, d1, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*0]
+	ldp	d2, d3, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*1]
+	/* LR from within La_aarch64_reg */
+	ldr	lr, [x29, #OFFSET_RG + DL_OFFSET_RG_LR]
+	cfi_restore(lr)
+	mov	sp, x29
+	cfi_def_cfa_register (sp)
+	ldr	x29, [x29, #0]
+	cfi_restore(x29)
+	add	sp, sp, SF_SIZE + 16
+	cfi_adjust_cfa_offset (- SF_SIZE - 16)
+
+	br	lr
+
+	cfi_endproc
+	.size _dl_runtime_profile, .-_dl_runtime_profile
+#endif
+	.previous