From: Lulu Cheng <chenglulu@loongson.cn>
To: gcc-patches@gcc.gnu.org
Cc: xry111@xry111.site, i@xen0n.name, xuchenghua@loongson.cn,
Lulu Cheng <chenglulu@loongson.cn>
Subject: [PATCH v1 0/2] LoongArch: Modify the method of obtaining symbolic addresses.
Date: Tue, 19 Jul 2022 21:08:50 +0800 [thread overview]
Message-ID: <20220719130852.2011955-1-chenglulu@loongson.cn> (raw)
1. The original LA macro instruction is split into two instructions to
obtain the address of the symbol if enable '-mexplicit-relocs'.
2. Currently, '-mcmodel=' only supports 'normal' mode, because other mode
behaviors are not yet determined. This function is gradually improved
by the subsequent handling.
3. Modify the method that calls global functions. From 'la.global + jirl'
to 'bl'.
4. Some R_LARCH_64 in section .eh_frame will to generate R_LARCH_NONE, we
change ASM_PREFERRED_EH_DATA_FORMAT from 'WD_EH_PE_absptr' to
'WD_EH_PE_pcrel | DW_EH_PE_sdata4' then relocation to R_LARCH_32_PCREL
from R_LARCH_64 in setction .eh_frame and not generate dynamic relocation
for R_LARCH_32_PCREL.
This new symbol loading method not support by upstream binutils yet,
this GCC port requires the following patches applied to binutils to build.
https://sourceware.org/pipermail/binutils/2022-July/121849.html
https://sourceware.org/pipermail/binutils/2022-July/121850.html
https://sourceware.org/pipermail/binutils/2022-July/121851.html
https://sourceware.org/pipermail/binutils/2022-July/121852.html
https://sourceware.org/pipermail/binutils/2022-July/121853.html
Lulu Cheng (2):
LoongArch: Modify the method of obtaining symbolic addresses.
LoongArch: Modify the definition of the ASM_PREFERRED_EH_DATA_FORMAT
macro.
.../config/loongarch/loongarch-common.cc | 1 +
gcc/config/loongarch/constraints.md | 24 +-
gcc/config/loongarch/genopts/loongarch.opt.in | 4 +
gcc/config/loongarch/loongarch-protos.h | 9 +-
gcc/config/loongarch/loongarch.cc | 660 +++++++++++++-----
gcc/config/loongarch/loongarch.h | 4 +-
gcc/config/loongarch/loongarch.md | 401 +++--------
gcc/config/loongarch/loongarch.opt | 4 +
gcc/config/loongarch/predicates.md | 56 +-
9 files changed, 629 insertions(+), 534 deletions(-)
--
2.31.1
next reply other threads:[~2022-07-19 13:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-19 13:08 Lulu Cheng [this message]
2022-07-19 13:08 ` [PATCH v1 1/2] " Lulu Cheng
2022-07-19 14:29 ` Xi Ruoyao
2022-07-20 0:40 ` Lulu Cheng
2022-07-19 13:08 ` [PATCH v1 2/2] LoongArch: Modify the definition of the ASM_PREFERRED_EH_DATA_FORMAT macro Lulu Cheng
2022-07-26 6:36 ` [pushed][PATCH v1 0/2] LoongArch: Modify the method of obtaining symbolic addresses Lulu Cheng
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