From: guoren@kernel.org
To: guoren@kernel.org, palmer@dabbelt.com, arnd@arndb.de,
anup@brainfault.org, gregkh@linuxfoundation.org, hch@lst.de
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org, linux-csky@vger.kernel.org,
linux-s390@vger.kernel.org, sparclinux@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-parisc@vger.kernel.org,
linux-mips@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
x86@kernel.org, heiko@sntech.de,
Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V8 20/20] riscv: compat: Add COMPAT Kbuild skeletal support
Date: Wed, 16 Mar 2022 15:03:17 +0800 [thread overview]
Message-ID: <20220316070317.1864279-21-guoren@kernel.org> (raw)
In-Reply-To: <20220316070317.1864279-1-guoren@kernel.org>
From: Guo Ren <guoren@linux.alibaba.com>
Adds initial skeletal COMPAT Kbuild (Running 32bit U-mode on
64bit S-mode) support.
- Setup kconfig & dummy functions for compiling.
- Implement compat_start_thread by the way.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
---
arch/riscv/Kconfig | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5adcbd9b5e88..6f11df8c189f 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -73,6 +73,7 @@ config RISCV
select HAVE_ARCH_KGDB if !XIP_KERNEL
select HAVE_ARCH_KGDB_QXFER_PKT
select HAVE_ARCH_MMAP_RND_BITS if MMU
+ select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU
@@ -123,12 +124,18 @@ config ARCH_MMAP_RND_BITS_MIN
default 18 if 64BIT
default 8
+config ARCH_MMAP_RND_COMPAT_BITS_MIN
+ default 8
+
# max bits determined by the following formula:
# VA_BITS - PAGE_SHIFT - 3
config ARCH_MMAP_RND_BITS_MAX
default 24 if 64BIT # SV39 based
default 17
+config ARCH_MMAP_RND_COMPAT_BITS_MAX
+ default 17
+
# set if we run in machine mode, cleared if we run in supervisor mode
config RISCV_M_MODE
bool
@@ -406,6 +413,18 @@ config CRASH_DUMP
For more details see Documentation/admin-guide/kdump/kdump.rst
+config COMPAT
+ bool "Kernel support for 32-bit U-mode"
+ default 64BIT
+ depends on 64BIT && MMU
+ help
+ This option enables support for a 32-bit U-mode running under a 64-bit
+ kernel at S-mode. riscv32-specific components such as system calls,
+ the user helper functions (vdso), signal rt_frame functions and the
+ ptrace interface are handled appropriately by the kernel.
+
+ If you want to execute 32-bit userspace applications, say Y.
+
endmenu
menu "Boot options"
--
2.25.1
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prev parent reply other threads:[~2022-03-16 7:22 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-16 7:02 [PATCH V8 00/20] riscv: compat: Add COMPAT Kbuild skeletal support guoren
2022-03-16 7:02 ` [PATCH V8 01/20] uapi: simplify __ARCH_FLOCK{,64}_PAD a little guoren
2022-03-16 7:02 ` [PATCH V8 02/20] uapi: always define F_GETLK64/F_SETLK64/F_SETLKW64 in fcntl.h guoren
2022-03-16 7:03 ` [PATCH V8 03/20] compat: consolidate the compat_flock{, 64} definition guoren
2022-03-16 7:03 ` [PATCH V8 04/20] kconfig: Add SYSVIPC_COMPAT for all architectures guoren
2022-03-16 7:03 ` [PATCH V8 05/20] fs: stat: compat: Add __ARCH_WANT_COMPAT_STAT guoren
2022-03-16 7:03 ` [PATCH V8 06/20] asm-generic: compat: Cleanup duplicate definitions guoren
2022-03-16 7:03 ` [PATCH V8 07/20] syscalls: compat: Fix the missing part for __SYSCALL_COMPAT guoren
2022-03-16 7:03 ` [PATCH V8 08/20] riscv: Fixup difference with defconfig guoren
2022-03-16 7:03 ` [PATCH V8 09/20] riscv: compat: Add basic compat data type implementation guoren
2022-03-16 7:03 ` [PATCH V8 10/20] riscv: compat: Re-implement TASK_SIZE for COMPAT_32BIT guoren
2022-03-21 0:22 ` Guo Ren
2022-03-16 7:03 ` [PATCH V8 11/20] riscv: compat: syscall: Add compat_sys_call_table implementation guoren
2022-03-16 7:03 ` [PATCH V8 12/20] riscv: compat: syscall: Add entry.S implementation guoren
2022-03-16 7:03 ` [PATCH V8 13/20] riscv: compat: process: Add UXL_32 support in start_thread guoren
2022-03-16 7:03 ` [PATCH V8 14/20] riscv: compat: Add elf.h implementation guoren
2022-03-16 7:03 ` [PATCH V8 15/20] riscv: compat: Add hw capability check for elf guoren
2022-03-16 7:03 ` [PATCH V8 16/20] riscv: compat: vdso: Add COMPAT_VDSO base code implementation guoren
2022-03-16 7:03 ` [PATCH V8 17/20] riscv: compat: vdso: Add setup additional pages implementation guoren
2022-03-16 7:03 ` [PATCH V8 18/20] riscv: compat: signal: Add rt_frame implementation guoren
2022-03-16 7:03 ` [PATCH V8 19/20] riscv: compat: ptrace: Add compat_arch_ptrace implement guoren
2022-03-16 7:03 ` guoren [this message]
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