From 6e5964311d57c017ed0af3d87095e54805f2541e Mon Sep 17 00:00:00 2001 From: Stafford Horne Date: Wed, 20 Oct 2021 06:47:26 +0900 Subject: or1k: ABI Implementation This code deals with the OpenRISC ABI. Reviewed-by: Adhemerval Zanella --- sysdeps/or1k/dl-trampoline.S | 73 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 sysdeps/or1k/dl-trampoline.S (limited to 'sysdeps/or1k/dl-trampoline.S') diff --git a/sysdeps/or1k/dl-trampoline.S b/sysdeps/or1k/dl-trampoline.S new file mode 100644 index 0000000000..d2936cbd10 --- /dev/null +++ b/sysdeps/or1k/dl-trampoline.S @@ -0,0 +1,73 @@ +/* Machine-dependent ELF runtime symbol resolution, OpenRISC version. + Copyright (C) 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include + +/* This code is plugged into the PLT and used by the dynamic linker to + call _dl_fixup (dl-runtime.c). + + We assume that R11 contains the relocation offset and R12 contains + link_map (_DYNAMIC). This must be consistent with the JUMP_SLOT + layout generated by binutils. */ + +ENTRY (_dl_runtime_resolve) + l.sw -4(r1), r9 + l.sw -8(r1), r1 + + /* save function arguments. */ + l.sw -12(r1), r3 + l.sw -16(r1), r4 + l.sw -20(r1), r5 + l.sw -24(r1), r6 + l.sw -28(r1), r7 + l.sw -32(r1), r8 + + .cfi_offset 9, -4 + .cfi_offset 1, -8 + .cfi_offset 3, -12 + .cfi_offset 4, -16 + .cfi_offset 5, -20 + .cfi_offset 6, -24 + .cfi_offset 7, -28 + .cfi_offset 8, -32 + + l.addi r1,r1, -32 + .cfi_def_cfa_offset 32 + + l.ori r3, r12, 0 + l.ori r4, r11, 0 + + l.jal _dl_fixup + l.nop + + /* Restore function arguments. */ + l.addi r1,r1, 32 + l.lwz r8, -32(r1) + l.lwz r7, -28(r1) + l.lwz r6, -24(r1) + l.lwz r5, -20(r1) + l.lwz r4, -16(r1) + l.lwz r3, -12(r1) + + /* restore return address. */ + l.lwz r9, -4(r1) + + l.jr r11 + l.nop +END (_dl_runtime_resolve) -- cgit 1.4.1