From: Lulu Cheng <chenglulu@loongson.cn>
To: gcc-patches@gcc.gnu.org
Cc: xry111@xry111.site, i@xen0n.name, xuchenghua@loongson.cn
Subject: Re: [pushed][PATCH v1 0/2] LoongArch: Modify the method of obtaining symbolic addresses.
Date: Tue, 26 Jul 2022 14:36:26 +0800 [thread overview]
Message-ID: <14f65155-7f20-dc23-9dbf-596e39a9cf2d@loongson.cn> (raw)
In-Reply-To: <20220719130852.2011955-1-chenglulu@loongson.cn>
在 2022/7/19 下午9:08, Lulu Cheng 写道:
> 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. Changed 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(-)
>
prev parent reply other threads:[~2022-07-26 6:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-19 13:08 [PATCH " Lulu Cheng
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 ` Lulu Cheng [this message]
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