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| author | caiyinyu <caiyinyu@loongson.cn> | 2022-07-19 09:20:46 +0800 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2022-07-26 12:35:12 -0300 |
| commit | a133942025da6fa62bb059b02f4e7a4b6e03e34a (patch) | |
| tree | 0972c69aadd4aa075193882c960ed2b85ae27fe4 /sysdeps/loongarch/dl-trampoline.S | |
| parent | 2d83247d90c9f0bfee7f3f2505bc1b13b6f36c04 (diff) | |
| download | glibc-a133942025da6fa62bb059b02f4e7a4b6e03e34a.zip glibc-a133942025da6fa62bb059b02f4e7a4b6e03e34a.tar.gz glibc-a133942025da6fa62bb059b02f4e7a4b6e03e34a.tar.bz2 | |
LoongArch: ABI Implementation
Diffstat (limited to 'sysdeps/loongarch/dl-trampoline.S')
| -rw-r--r-- | sysdeps/loongarch/dl-trampoline.S | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/sysdeps/loongarch/dl-trampoline.S b/sysdeps/loongarch/dl-trampoline.S new file mode 100644 index 0000000..ad8ab0f --- /dev/null +++ b/sysdeps/loongarch/dl-trampoline.S @@ -0,0 +1,83 @@ +/* PLT trampolines. + 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, see + <https://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. */ + +# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK)) + +ENTRY (_dl_runtime_resolve) + + /* Save arguments to stack. */ + ADDI sp, sp, -FRAME_SIZE + + REG_S ra, sp, 9*SZREG + REG_S a0, sp, 1*SZREG + REG_S a1, sp, 2*SZREG + REG_S a2, sp, 3*SZREG + REG_S a3, sp, 4*SZREG + REG_S a4, sp, 5*SZREG + REG_S a5, sp, 6*SZREG + REG_S a6, sp, 7*SZREG + REG_S a7, sp, 8*SZREG + + FREG_S fa0, sp, 10*SZREG + 0*SZFREG + FREG_S fa1, sp, 10*SZREG + 1*SZFREG + FREG_S fa2, sp, 10*SZREG + 2*SZFREG + FREG_S fa3, sp, 10*SZREG + 3*SZFREG + FREG_S fa4, sp, 10*SZREG + 4*SZFREG + FREG_S fa5, sp, 10*SZREG + 5*SZFREG + FREG_S fa6, sp, 10*SZREG + 6*SZFREG + FREG_S fa7, sp, 10*SZREG + 7*SZFREG + + /* Update .got.plt and obtain runtime address of callee */ + SLLI a1, t1, 1 + or a0, t0, zero + ADD a1, a1, t1 + la a2, _dl_fixup + jirl ra, a2, 0 + or t1, v0, zero + + /* Restore arguments from stack. */ + REG_L ra, sp, 9*SZREG + REG_L a0, sp, 1*SZREG + REG_L a1, sp, 2*SZREG + REG_L a2, sp, 3*SZREG + REG_L a3, sp, 4*SZREG + REG_L a4, sp, 5*SZREG + REG_L a5, sp, 6*SZREG + REG_L a6, sp, 7*SZREG + REG_L a7, sp, 8*SZREG + + FREG_L fa0, sp, 10*SZREG + 0*SZFREG + FREG_L fa1, sp, 10*SZREG + 1*SZFREG + FREG_L fa2, sp, 10*SZREG + 2*SZFREG + FREG_L fa3, sp, 10*SZREG + 3*SZFREG + FREG_L fa4, sp, 10*SZREG + 4*SZFREG + FREG_L fa5, sp, 10*SZREG + 5*SZFREG + FREG_L fa6, sp, 10*SZREG + 6*SZFREG + FREG_L fa7, sp, 10*SZREG + 7*SZFREG + + ADDI sp, sp, FRAME_SIZE + + /* Invoke the callee. */ + jirl zero, t1, 0 +END (_dl_runtime_resolve) |