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-rw-r--r--ports/sysdeps/aarch64/dl-trampoline.S276
1 files changed, 276 insertions, 0 deletions
diff --git a/ports/sysdeps/aarch64/dl-trampoline.S b/ports/sysdeps/aarch64/dl-trampoline.S
new file mode 100644
index 0000000000..77badc77cf
--- /dev/null
+++ b/ports/sysdeps/aarch64/dl-trampoline.S
@@ -0,0 +1,276 @@
+/* Copyright (C) 2005-2012 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]!
+	cfi_adjust_cfa_offset (80)
+	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)
+
+	/* Get pointer to linker struct.  */
+	ldr	x0, [ip0, #-8]
+
+	/* Prepare to call _dl_fixup().  */
+	ldr	x1, [sp, 80]	/* 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	x0, x1, [sp, #64]
+	ldp	x2, x3, [sp, #48]
+	ldp	x4, x5, [sp, #32]
+	ldp	x6, x7, [sp, #16]
+	ldp	x8, x9, [sp], #80
+	cfi_adjust_cfa_offset (-80)
+
+	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
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