/* RISC-V PLT trampoline

   Copyright (C) 2017-2018 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 <sys/asm.h>

/* Assembler veneer called from the PLT header code for lazy loading.

   The PLT header passes its own args in t0-t2.  */

#ifdef __riscv_float_abi_soft

# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))

#else

# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))

#endif

ENTRY (_dl_runtime_resolve)

  # Save arguments to stack.

  addi sp, sp, -FRAME_SIZE

  REG_S ra, 9*SZREG(sp)

  REG_S a0, 1*SZREG(sp)

  REG_S a1, 2*SZREG(sp)

  REG_S a2, 3*SZREG(sp)

  REG_S a3, 4*SZREG(sp)

  REG_S a4, 5*SZREG(sp)

  REG_S a5, 6*SZREG(sp)

  REG_S a6, 7*SZREG(sp)

  REG_S a7, 8*SZREG(sp)

#ifndef __riscv_float_abi_soft

  FREG_S fa0, (10*SZREG + 0*SZFREG)(sp)

  FREG_S fa1, (10*SZREG + 1*SZFREG)(sp)

  FREG_S fa2, (10*SZREG + 2*SZFREG)(sp)

  FREG_S fa3, (10*SZREG + 3*SZFREG)(sp)

  FREG_S fa4, (10*SZREG + 4*SZFREG)(sp)

  FREG_S fa5, (10*SZREG + 5*SZFREG)(sp)

  FREG_S fa6, (10*SZREG + 6*SZFREG)(sp)

  FREG_S fa7, (10*SZREG + 7*SZFREG)(sp)

#endif

  # Update .got.plt and obtain runtime address of callee.

  slli a1, t1, 1

  mv a0, t0       # link map

  add a1, a1, t1  # reloc offset (== thrice the .got.plt offset)

  la a2, _dl_fixup

  jalr a2

  mv t1, a0

  # Restore arguments from stack.

  REG_L ra, 9*SZREG(sp)

  REG_L a0, 1*SZREG(sp)

  REG_L a1, 2*SZREG(sp)

  REG_L a2, 3*SZREG(sp)

  REG_L a3, 4*SZREG(sp)

  REG_L a4, 5*SZREG(sp)

  REG_L a5, 6*SZREG(sp)

  REG_L a6, 7*SZREG(sp)

  REG_L a7, 8*SZREG(sp)

#ifndef __riscv_float_abi_soft

  FREG_L fa0, (10*SZREG + 0*SZFREG)(sp)

  FREG_L fa1, (10*SZREG + 1*SZFREG)(sp)

  FREG_L fa2, (10*SZREG + 2*SZFREG)(sp)

  FREG_L fa3, (10*SZREG + 3*SZFREG)(sp)

  FREG_L fa4, (10*SZREG + 4*SZFREG)(sp)

  FREG_L fa5, (10*SZREG + 5*SZFREG)(sp)

  FREG_L fa6, (10*SZREG + 6*SZFREG)(sp)

  FREG_L fa7, (10*SZREG + 7*SZFREG)(sp)

#endif

  addi sp, sp, FRAME_SIZE

  # Invoke the callee.

  jr t1

END (_dl_runtime_resolve)