From:   Greg Ungerer <gerg@kernel.org>
To:     linux-riscv@lists.infradead.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Cc:     Greg Ungerer <gerg@kernel.org>
Subject: [PATCH 0/2] riscv: support ELF format binaries in nommu mode
Date:   Tue, 28 Feb 2023 23:51:24 +1000
Message-Id: <20230228135126.1686427-1-gerg@kernel.org>
MIME-Version: 1.0
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Precedence: bulk

The following changes add the ability to run ELF format binaries when
running RISC-V in nommu mode. That support is actually part of the
ELF-FDPIC loader, so these changes are all about making that work on
RISC-V.

The first issue to deal with is making the ELF-FDPIC loader capable of
handling 64-bit ELF files. As coded right now it only supports 32-bit
ELF files.

Secondly some changes are required to enable and compile the ELF-FDPIC
loader on RISC-V and to pass the ELF-FDPIC mapping addresses through to
user space when execing the new program.

These changes have not been used to run actual ELF-FDPIC binaries.
It is used to load and run normal ELF - compiled -pie format. Though the
underlying changes are expected to work with full ELF-FDPIC binaries if
or when that is supported on RISC-V in gcc.

To avoid needing changes to the C-library (tested with uClibc-ng
currently) there is a simple runtime dynamic loader (interpreter)
available to do the final relocations, https://github.com/gregungerer/uldso.
The nice thing about doing it this way is that the same program
binary can also be loaded with the usual ELF loader in MMU linux.

The motivation here is to provide an easy to use alternative to the
flat format binaries normally used for RISC-V nommu based systems.

Signed-off-by: Greg Ungerer <gerg@kernel.org>
---

 arch/riscv/include/asm/elf.h         |   11 +++++++++-
 arch/riscv/include/asm/mmu.h         |    4 +++
 arch/riscv/include/uapi/asm/ptrace.h |    5 ++++
 fs/Kconfig.binfmt                    |    2 -
 fs/binfmt_elf_fdpic.c                |   38 +++++++++++++++++------------------
 include/linux/elf-fdpic.h            |   14 +++++++++++-
 include/uapi/linux/elf-fdpic.h       |   15 +++++++++++++
 7 files changed, 67 insertions(+), 22 deletions(-)