| /* PLT trampolines. Nios II version. |
| Copyright (C) 2005-2016 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> |
| |
| .text |
| .globl _dl_runtime_resolve |
| cfi_startproc |
| _dl_runtime_resolve: |
| /* The runtime resolver receives the original function arguments in r4 |
| through r7, the shared library identifier from GOT[1]? in r14, and the |
| relocation index times four in r15. It updates the corresponding PLT GOT |
| entry so that the PLT entry will transfer control directly to the target |
| in the future, and then transfers control to the target. */ |
| /* Save arguments and return address. */ |
| subi sp, sp, 28 |
| cfi_adjust_cfa_offset (28) |
| stw r22, 24(sp) |
| cfi_rel_offset (r22, 24) |
| stw r8, 20(sp) /* save r8, because this might be a call to mcount */ |
| cfi_rel_offset (r8, 20) |
| stw r7, 16(sp) |
| cfi_rel_offset (r7, 16) |
| stw r6, 12(sp) |
| cfi_rel_offset (r6, 12) |
| stw r5, 8(sp) |
| cfi_rel_offset (r5, 8) |
| stw r4, 4(sp) |
| cfi_rel_offset (r4, 4) |
| stw ra, 0(sp) |
| cfi_rel_offset (ra, 0) |
| |
| /* Get pointer to linker struct. */ |
| mov r4, r14 |
| |
| /* Get the relocation offset. We're given a multiple of 4 and |
| need a multiple of 12, so multiply by 3. */ |
| slli r5, r15, 1 |
| add r5, r5, r15 |
| |
| /* Call the fixup routine. */ |
| nextpc r22 |
| 1: movhi r2, %hiadj(_gp_got - 1b) |
| addi r2, r2, %lo(_gp_got - 1b) |
| add r22, r22, r2 |
| ldw r2, %call(_dl_fixup)(r22) |
| callr r2 |
| |
| /* Restore the arguments and return address. */ |
| ldw ra, 0(sp) |
| ldw r4, 4(sp) |
| ldw r5, 8(sp) |
| ldw r6, 12(sp) |
| ldw r7, 16(sp) |
| ldw r8, 20(sp) |
| ldw r22, 24(sp) |
| addi sp, sp, 28 |
| cfi_adjust_cfa_offset (-28) |
| |
| /* Jump to the newly found address. */ |
| jmp r2 |
| |
| cfi_endproc |