From: Greg Ungerer <gerg@kernel.org> To: linux-riscv@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: palmer@dabbelt.com, viro@zeniv.linux.org.uk, ebiederm@xmission.com, keescook@chromium.org, brauner@kernel.org, Greg Ungerer <gerg@kernel.org> Subject: [PATCH v2 0/2] riscv: support ELF format binaries in nommu mode Date: Tue, 11 Jul 2023 23:07:52 +1000 [thread overview] Message-ID: <20230711130754.481209-1-gerg@kernel.org> (raw) 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> --- v1->v2: rebase onto 6.5-rc1 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(-)
WARNING: multiple messages have this Message-ID (diff)
From: Greg Ungerer <gerg@kernel.org> To: linux-riscv@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: palmer@dabbelt.com, viro@zeniv.linux.org.uk, ebiederm@xmission.com, keescook@chromium.org, brauner@kernel.org, Greg Ungerer <gerg@kernel.org> Subject: [PATCH v2 0/2] riscv: support ELF format binaries in nommu mode Date: Tue, 11 Jul 2023 23:07:52 +1000 [thread overview] Message-ID: <20230711130754.481209-1-gerg@kernel.org> (raw) 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> --- v1->v2: rebase onto 6.5-rc1 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(-) _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv
next reply other threads:[~2023-07-11 13:08 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-07-11 13:07 Greg Ungerer [this message] 2023-07-11 13:07 ` [PATCH v2 0/2] riscv: support ELF format binaries in nommu mode Greg Ungerer 2023-07-11 13:07 ` [PATCH v2 1/2] binfmt_elf_fdpic: support 64-bit systems Greg Ungerer 2023-07-11 13:07 ` Greg Ungerer 2023-07-11 15:51 ` Kees Cook 2023-07-11 15:51 ` Kees Cook 2023-07-11 13:07 ` [PATCH v2 2/2] riscv: support the elf-fdpic binfmt loader Greg Ungerer 2023-07-11 13:07 ` Greg Ungerer 2023-07-11 15:53 ` Kees Cook 2023-07-11 15:53 ` Kees Cook 2023-07-12 1:42 ` Greg Ungerer 2023-07-12 1:42 ` Greg Ungerer 2023-07-12 15:12 ` Stefan O'Rear 2023-07-12 15:12 ` Stefan O'Rear 2023-07-13 13:17 ` Greg Ungerer 2023-07-13 13:17 ` Greg Ungerer 2023-07-13 14:26 ` Stefan O'Rear 2023-07-13 14:26 ` Stefan O'Rear 2023-07-14 13:51 ` Greg Ungerer 2023-07-14 13:51 ` Greg Ungerer 2023-07-14 16:40 ` Stefan O'Rear 2023-07-14 16:40 ` Stefan O'Rear 2023-08-30 13:20 ` [PATCH v2 0/2] riscv: support ELF format binaries in nommu mode patchwork-bot+linux-riscv 2023-08-30 13:20 ` patchwork-bot+linux-riscv
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