RISC-V: Add support for rv32 userspace via COMPAT

The RISC-V port supports the rv32i and rv64i base ISAs, but provides no mechanism to run 32-bit userspace on 64-bit systems. This adds that support, via the COMPAT framework. As the RISC-V ISAs (and uABIs) were developed concurrently, the resulting compat support is mostly generic. This includes a handful of cleanups to the generic compat infrastructure to more cleanly support RISC-V, followed by the RISC-V implementation. * palmer/riscv-compat: riscv: compat: Add COMPAT Kbuild skeletal support riscv: compat: ptrace: Add compat_arch_ptrace implement riscv: compat: signal: Add rt_frame implementation riscv: compat: vdso: Add setup additional pages implementation riscv: compat: vdso: Add COMPAT_VDSO base code implementation riscv: compat: Add hw capability check for elf riscv: compat: Add elf.h implementation riscv: compat: process: Add UXL_32 support in start_thread riscv: compat: syscall: Add entry.S implementation riscv: compat: syscall: Add compat_sys_call_table implementation riscv: compat: Support TASK_SIZE for compat mode riscv: compat: Add basic compat data type implementation riscv: Fixup difference with defconfig syscalls: compat: Fix the missing part for __SYSCALL_COMPAT asm-generic: compat: Cleanup duplicate definitions fs: stat: compat: Add __ARCH_WANT_COMPAT_STAT arch: Add SYSVIPC_COMPAT for all architectures compat: consolidate the compat_flock{,64} definition uapi: always define F_GETLK64/F_SETLK64/F_SETLKW64 in fcntl.h uapi: simplify __ARCH_FLOCK{,64}_PAD a little
2026-10-16 22:39:48 +00:00 · 2022-05-19 09:51:59 -07:00 · 2022-05-19 09:51:59 -07:00 · 7eb6369d7a
commit 7eb6369d7a
parent 93c0651617 9be8459298
68 changed files with 1219 additions and 563 deletions
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
--- a/arch/arm64/include/asm/compat.h
+++ b/arch/arm64/include/asm/compat.h
--- a/arch/arm64/include/asm/unistd.h
+++ b/arch/arm64/include/asm/unistd.h
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
--- a/arch/mips/include/asm/compat.h
+++ b/arch/mips/include/asm/compat.h
--- a/arch/mips/include/asm/unistd.h
+++ b/arch/mips/include/asm/unistd.h
--- a/arch/mips/include/uapi/asm/fcntl.h
+++ b/arch/mips/include/uapi/asm/fcntl.h
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
--- a/arch/parisc/include/asm/compat.h
+++ b/arch/parisc/include/asm/compat.h
--- a/arch/parisc/include/asm/unistd.h
+++ b/arch/parisc/include/asm/unistd.h
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
--- a/arch/powerpc/include/asm/compat.h
+++ b/arch/powerpc/include/asm/compat.h
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
--- a/arch/riscv/include/asm/compat.h
+++ b/arch/riscv/include/asm/compat.h
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
--- a/arch/riscv/include/asm/elf.h
+++ b/arch/riscv/include/asm/elf.h
--- a/arch/riscv/include/asm/mmu.h
+++ b/arch/riscv/include/asm/mmu.h
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
--- a/arch/riscv/include/asm/signal32.h
+++ b/arch/riscv/include/asm/signal32.h
--- a/arch/riscv/include/asm/syscall.h
+++ b/arch/riscv/include/asm/syscall.h
--- a/arch/riscv/include/asm/thread_info.h
+++ b/arch/riscv/include/asm/thread_info.h
--- a/arch/riscv/include/asm/unistd.h
+++ b/arch/riscv/include/asm/unistd.h
--- a/arch/riscv/include/asm/vdso.h
+++ b/arch/riscv/include/asm/vdso.h
--- a/arch/riscv/include/uapi/asm/unistd.h
+++ b/arch/riscv/include/uapi/asm/unistd.h
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
--- a/arch/riscv/kernel/compat_signal.c
+++ b/arch/riscv/kernel/compat_signal.c
--- a/arch/riscv/kernel/compat_syscall_table.c
+++ b/arch/riscv/kernel/compat_syscall_table.c
--- a/arch/riscv/kernel/compat_vdso/.gitignore
+++ b/arch/riscv/kernel/compat_vdso/.gitignore
--- a/arch/riscv/kernel/compat_vdso/Makefile
+++ b/arch/riscv/kernel/compat_vdso/Makefile
--- a/arch/riscv/kernel/compat_vdso/compat_vdso.S
+++ b/arch/riscv/kernel/compat_vdso/compat_vdso.S
--- a/arch/riscv/kernel/compat_vdso/compat_vdso.lds.S
+++ b/arch/riscv/kernel/compat_vdso/compat_vdso.lds.S
--- a/arch/riscv/kernel/compat_vdso/flush_icache.S
+++ b/arch/riscv/kernel/compat_vdso/flush_icache.S
--- a/arch/riscv/kernel/compat_vdso/gen_compat_vdso_offsets.sh
+++ b/arch/riscv/kernel/compat_vdso/gen_compat_vdso_offsets.sh
--- a/arch/riscv/kernel/compat_vdso/getcpu.S
+++ b/arch/riscv/kernel/compat_vdso/getcpu.S
--- a/arch/riscv/kernel/compat_vdso/note.S
+++ b/arch/riscv/kernel/compat_vdso/note.S
--- a/arch/riscv/kernel/compat_vdso/rt_sigreturn.S
+++ b/arch/riscv/kernel/compat_vdso/rt_sigreturn.S
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
--- a/arch/riscv/kernel/ptrace.c
+++ b/arch/riscv/kernel/ptrace.c
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
--- a/arch/riscv/kernel/sys_riscv.c
+++ b/arch/riscv/kernel/sys_riscv.c
--- a/arch/riscv/kernel/vdso.c
+++ b/arch/riscv/kernel/vdso.c
--- a/arch/riscv/kernel/vdso/vdso.S
+++ b/arch/riscv/kernel/vdso/vdso.S
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
--- a/arch/s390/include/asm/compat.h
+++ b/arch/s390/include/asm/compat.h
--- a/arch/s390/include/asm/unistd.h
+++ b/arch/s390/include/asm/unistd.h
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
--- a/arch/sparc/include/asm/compat.h
+++ b/arch/sparc/include/asm/compat.h
--- a/arch/sparc/include/asm/unistd.h
+++ b/arch/sparc/include/asm/unistd.h
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
--- a/arch/x86/include/asm/compat.h
+++ b/arch/x86/include/asm/compat.h
--- a/arch/x86/include/asm/unistd.h
+++ b/arch/x86/include/asm/unistd.h
--- a/fs/open.c
+++ b/fs/open.c
--- a/fs/read_write.c
+++ b/fs/read_write.c
--- a/fs/stat.c
+++ b/fs/stat.c
--- a/fs/sync.c
+++ b/fs/sync.c
--- a/include/asm-generic/compat.h
+++ b/include/asm-generic/compat.h
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
--- a/include/uapi/asm-generic/fcntl.h
+++ b/include/uapi/asm-generic/fcntl.h
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
--- a/init/Kconfig
+++ b/init/Kconfig
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
--- a/mm/readahead.c
+++ b/mm/readahead.c
--- a/tools/include/uapi/asm-generic/fcntl.h
+++ b/tools/include/uapi/asm-generic/fcntl.h
--- a/tools/include/uapi/asm-generic/unistd.h
+++ b/tools/include/uapi/asm-generic/unistd.h