aarch64: morello: add lazy binding entry code

diff --git a/sysdeps/aarch64/morello/dl-trampoline.S b/sysdeps/aarch64/morello/dl-trampoline.S
new file mode 100644 (file)
index 0000000..dcd61d6
--- /dev/null
+++ b/sysdeps/aarch64/morello/dl-trampoline.S
@@ -0,0 +1,136 @@
+/* Copyright (C) 2005-2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+#include <libc-symbols.h>
+
+#include "dl-link.h"
+
+#define ip0 c16
+#define ip0l c16
+#define ip1 c17
+#define lr  c30
+
+#define RELA_SIZE 24
+
+       .text
+       .globl _dl_runtime_resolve
+       .type _dl_runtime_resolve, #function
+       cfi_startproc
+       .align 2
+_dl_runtime_resolve:
+       /* Morello we get called with:
+          ip0          &PLTGOT[2]
+          ip1          temp(dl resolver entry point)
+          [sp, #16]    lr
+          [sp, #0]     &PLTGOT[n]
+        */
+
+       cfi_rel_offset (lr, 16)
+
+       /* Save arguments.  */
+       stp     c8, c9, [csp, #-(160+8*16)]!
+       cfi_adjust_cfa_offset (160+8*16)
+       cfi_rel_offset (c8, 0)
+       cfi_rel_offset (c9, 16)
+
+       stp     c6, c7, [csp,  #32]
+       cfi_rel_offset (c6, 32)
+       cfi_rel_offset (c7, 48)
+
+       stp     c4, c5, [csp,  #64]
+       cfi_rel_offset (c4, 64)
+       cfi_rel_offset (c5, 80)
+
+       stp     c2, c3, [csp,  #96]
+       cfi_rel_offset (c2, 96)
+       cfi_rel_offset (c3, 112)
+
+       stp     c0, c1, [csp,  #128]
+       cfi_rel_offset (c0, 128)
+       cfi_rel_offset (c1, 144)
+
+       stp     q0, q1, [csp, #(160+0*16)]
+       cfi_rel_offset (q0, 160+0*16)
+       cfi_rel_offset (q1, 160+1*16)
+
+       stp     q2, q3, [csp, #(160+2*16)]
+       cfi_rel_offset (q0, 160+2*16)
+       cfi_rel_offset (q1, 160+3*16)
+
+       stp     q4, q5, [csp, #(160+4*16)]
+       cfi_rel_offset (q0, 160+4*16)
+       cfi_rel_offset (q1, 160+5*16)
+
+       stp     q6, q7, [csp, #(160+6*16)]
+       cfi_rel_offset (q0, 160+6*16)
+       cfi_rel_offset (q1, 160+7*16)
+
+       /* Get pointer to linker struct.  */
+       ldr     c0, [ip0, #-PTR_SIZE]
+
+       /* Prepare to call _dl_fixup().  */
+       ldr     c1, [csp, 160+8*16]     /* Recover &PLTGOT[n] */
+
+       sub     x1, x1, x16
+       add     x1, x1, x1, lsl #1
+       lsr     x1, x1, #1
+       sub     x1, x1, #RELA_SIZE
+
+       /* Call fixup routine.  */
+       bl      _dl_fixup
+
+       /* Save the return.  */
+       mov     ip0, c0
+
+       /* Get arguments and return address back.  */
+       ldp     q0, q1, [csp, #(160+0*16)]
+       ldp     q2, q3, [csp, #(160+2*16)]
+       ldp     q4, q5, [csp, #(160+4*16)]
+       ldp     q6, q7, [csp, #(160+6*16)]
+       ldp     c0, c1, [csp, #128]
+       ldp     c2, c3, [csp, #96]
+       ldp     c4, c5, [csp, #64]
+       ldp     c6, c7, [csp, #32]
+       ldp     c8, c9, [csp], #(160+8*16)
+       cfi_adjust_cfa_offset (-(160+8*16))
+
+       ldp     ip1, lr, [csp], #32
+       cfi_adjust_cfa_offset (-32)
+
+       /* 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:
+
+       /* TODO: requires definition of La_aarch64_* layout
+          and register state saved correctly for varargs ABI.  */
+       mov c0, 0
+       ldr c0, [c0]
+
+       cfi_endproc
+       .size _dl_runtime_profile, .-_dl_runtime_profile
+#endif
+       .previous