From: guoren@kernel.org
To: guoren@kernel.org, palmer@dabbelt.com, arnd@arndb.de,
anup.patel@wdc.com, gregkh@linuxfoundation.org,
liush@allwinnertech.com, wefu@redhat.com, drew@beagleboard.org,
wangjunqiang@iscas.ac.cn, hch@infradead.org
Cc: 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,
inux-parisc@vger.kernel.org, linux-mips@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, x86@kernel.org,
Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V2 17/17] riscv: compat: Add COMPAT Kbuild skeletal support
Date: Tue, 28 Dec 2021 22:39:58 +0800 [thread overview]
Message-ID: <20211228143958.3409187-18-guoren@kernel.org> (raw)
In-Reply-To: <20211228143958.3409187-1-guoren@kernel.org>
From: Guo Ren <guoren@linux.alibaba.com>
Adds initial skeletal COMPAT Kbuild (Runing 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>
Cc: Arnd Bergmann <arnd@arndb.de>
---
arch/riscv/Kconfig | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 821252b65f89..08f1f3ba3d77 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -72,6 +72,7 @@ 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
@@ -122,12 +123,18 @@ 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
@@ -427,6 +434,18 @@ 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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next prev parent reply other threads:[~2021-12-28 15:09 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-28 14:39 [PATCH V2 00/17] riscv: compat: Add COMPAT mode support for rv64 guoren
2021-12-28 14:39 ` [PATCH V2 01/17] kconfig: Add SYSVIPC_COMPAT for all architectures guoren
2022-01-10 11:43 ` Arnd Bergmann
2021-12-28 14:39 ` [PATCH V2 02/17] fs: stat: compat: Add __ARCH_WANT_COMPAT_STAT guoren
2022-01-10 11:44 ` Arnd Bergmann
2021-12-28 14:39 ` [PATCH V2 03/17] asm-generic: fcntl: compat: Remove duplicate definitions guoren
2022-01-10 13:35 ` Arnd Bergmann
2022-01-10 16:30 ` Christoph Hellwig
2022-01-11 2:43 ` Guo Ren
2022-01-10 15:56 ` Christophe Leroy
2021-12-28 14:39 ` [PATCH V2 04/17] asm-generic: compat: Cleanup " guoren
2021-12-28 14:39 ` [PATCH V2 05/17] syscalls: compat: Fix the missing part for __SYSCALL_COMPAT guoren
2021-12-28 14:39 ` [PATCH V2 06/17] riscv: Fixup difference with defconfig guoren
2021-12-28 14:39 ` [PATCH V2 07/17] riscv: compat: Add basic compat date type implementation guoren
2021-12-28 14:39 ` [PATCH V2 08/17] riscv: compat: Re-implement TASK_SIZE for COMPAT_32BIT guoren
2021-12-28 14:39 ` [PATCH V2 09/17] riscv: compat: syscall: Add compat_sys_call_table implementation guoren
2021-12-28 14:39 ` [PATCH V2 10/17] riscv: compat: syscall: Add entry.S implementation guoren
2021-12-28 14:39 ` [PATCH V2 11/17] riscv: compat: Add elf.h implementation guoren
2022-01-10 14:28 ` Arnd Bergmann
2022-01-11 2:42 ` Guo Ren
2021-12-28 14:39 ` [PATCH V2 12/17] riscv: compat: vdso: Add rv32 VDSO base code implementation guoren
2021-12-28 14:39 ` [PATCH V2 13/17] riscv: compat: vdso: Add setup additional pages implementation guoren
2021-12-28 14:39 ` [PATCH V2 14/17] riscv: compat: signal: Add rt_frame implementation guoren
2021-12-28 14:39 ` [PATCH V2 15/17] riscv: compat: ptrace: Add compat_arch_ptrace implement guoren
2021-12-28 14:39 ` [PATCH V2 16/17] riscv: compat: Add UXL_32 support in start_thread guoren
2021-12-28 14:39 ` guoren [this message]
2022-01-20 7:39 ` [PATCH V2 00/17] riscv: compat: Add COMPAT mode support for rv64 guoren
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