From: guoren@kernel.org
To: guoren@kernel.org, palmer@dabbelt.com, arnd@arndb.de,
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 V9 10/20] riscv: compat: Re-implement TASK_SIZE for COMPAT_32BIT
Date: Tue, 22 Mar 2022 22:39:53 +0800 [thread overview]
Message-ID: <20220322144003.2357128-11-guoren@kernel.org> (raw)
In-Reply-To: <20220322144003.2357128-1-guoren@kernel.org>
From: Guo Ren <guoren@linux.alibaba.com>
Make TASK_SIZE from const to dynamic detect TIF_32BIT flag
function. Refer to arm64 to implement DEFAULT_MAP_WINDOW_64 for
efi-stub.
Limit 32-bit compatible process in 0-2GB virtual address range
(which is enough for real scenarios), because it could avoid
address sign extend problem when 32-bit enter 64-bit and ease
software design.
The standard 32-bit TASK_SIZE is 0x9dc00000:FIXADDR_START, and
compared to a compatible 32-bit, it increases 476MB for the
application's virtual address.
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>
---
arch/riscv/include/asm/pgtable.h | 13 +++++++++++--
arch/riscv/include/asm/processor.h | 6 +++++-
2 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index e3549e50de95..afdc9ece2ba4 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -705,8 +705,17 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
* 63–48 all equal to bit 47, or else a page-fault exception will occur."
*/
#ifdef CONFIG_64BIT
-#define TASK_SIZE (PGDIR_SIZE * PTRS_PER_PGD / 2)
-#define TASK_SIZE_MIN (PGDIR_SIZE_L3 * PTRS_PER_PGD / 2)
+#define TASK_SIZE_64 (PGDIR_SIZE * PTRS_PER_PGD / 2)
+#define TASK_SIZE_MIN (PGDIR_SIZE_L3 * PTRS_PER_PGD / 2)
+
+#ifdef CONFIG_COMPAT
+#define TASK_SIZE_32 (_AC(0x80000000, UL) - PAGE_SIZE)
+#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
+ TASK_SIZE_32 : TASK_SIZE_64)
+#else
+#define TASK_SIZE TASK_SIZE_64
+#endif
+
#else
#define TASK_SIZE FIXADDR_START
#define TASK_SIZE_MIN TASK_SIZE
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index 0749924d9e55..21c8072dce17 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -19,7 +19,11 @@
#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
#define STACK_TOP TASK_SIZE
-#define STACK_TOP_MAX STACK_TOP
+#ifdef CONFIG_64BIT
+#define STACK_TOP_MAX TASK_SIZE_64
+#else
+#define STACK_TOP_MAX TASK_SIZE
+#endif
#define STACK_ALIGN 16
#ifndef __ASSEMBLY__
--
2.25.1
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next prev parent reply other threads:[~2022-03-22 14:48 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-22 14:39 [PATCH V9 00/20] riscv: compat: Add COMPAT Kbuild skeletal support guoren
2022-03-22 14:39 ` [PATCH V9 01/20] uapi: simplify __ARCH_FLOCK{,64}_PAD a little guoren
2022-03-22 14:39 ` [PATCH V9 02/20] uapi: always define F_GETLK64/F_SETLK64/F_SETLKW64 in fcntl.h guoren
2022-03-22 14:39 ` [PATCH V9 03/20] compat: consolidate the compat_flock{, 64} definition guoren
2022-03-22 14:39 ` [PATCH V9 04/20] kconfig: Add SYSVIPC_COMPAT for all architectures guoren
2022-03-22 14:39 ` [PATCH V9 05/20] fs: stat: compat: Add __ARCH_WANT_COMPAT_STAT guoren
2022-03-22 14:39 ` [PATCH V9 06/20] asm-generic: compat: Cleanup duplicate definitions guoren
2022-03-22 14:39 ` [PATCH V9 07/20] syscalls: compat: Fix the missing part for __SYSCALL_COMPAT guoren
2022-03-22 14:39 ` [PATCH V9 08/20] riscv: Fixup difference with defconfig guoren
2022-03-22 14:39 ` [PATCH V9 09/20] riscv: compat: Add basic compat data type implementation guoren
2022-03-22 14:39 ` guoren [this message]
2022-03-22 14:39 ` [PATCH V9 11/20] riscv: compat: syscall: Add compat_sys_call_table implementation guoren
2022-03-23 13:40 ` Guo Ren
2022-03-22 14:39 ` [PATCH V9 12/20] riscv: compat: syscall: Add entry.S implementation guoren
2022-03-22 14:39 ` [PATCH V9 13/20] riscv: compat: process: Add UXL_32 support in start_thread guoren
2022-03-22 14:39 ` [PATCH V9 14/20] riscv: compat: Add elf.h implementation guoren
2022-03-22 14:39 ` [PATCH V9 15/20] riscv: compat: Add hw capability check for elf guoren
2022-03-22 14:39 ` [PATCH V9 16/20] riscv: compat: vdso: Add COMPAT_VDSO base code implementation guoren
2022-03-22 14:40 ` [PATCH V9 17/20] riscv: compat: vdso: Add setup additional pages implementation guoren
2022-03-22 14:40 ` [PATCH V9 18/20] riscv: compat: signal: Add rt_frame implementation guoren
2022-03-22 14:40 ` [PATCH V9 19/20] riscv: compat: ptrace: Add compat_arch_ptrace implement guoren
2022-03-22 14:40 ` [PATCH V9 20/20] riscv: compat: Add COMPAT Kbuild skeletal support guoren
2022-05-23 5:45 ` Guenter Roeck
2022-05-23 15:18 ` Guo Ren
2022-05-23 16:18 ` Guenter Roeck
2022-05-23 22:40 ` Heiko Stübner
2022-05-23 23:00 ` Guenter Roeck
2022-05-24 14:41 ` Heiko Stübner
2022-05-24 17:42 ` Guo Ren
2022-05-24 17:46 ` Guo Ren
2022-05-24 22:06 ` Guenter Roeck
2022-05-25 10:57 ` Heiko Stübner
2022-05-25 11:10 ` Heiko Stübner
2022-05-25 16:08 ` Guo Ren
2022-05-25 19:37 ` Heiko Stübner
2022-05-26 0:39 ` Guo Ren
2022-03-22 21:00 ` [PATCH V9 00/20] " Palmer Dabbelt
2022-04-02 12:53 ` Guo Ren
2022-04-02 13:16 ` Guo Ren
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