| /* 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) |
