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Subject[PATCH 4.9 27/61] ARM: uaccess: consolidate uaccess asm to asm/uaccess-asm.h
Date
From: Russell King <rmk+kernel@armlinux.org.uk>

[ Upstream commit 747ffc2fcf969eff9309d7f2d1d61cb8b9e1bb40 ]

Consolidate the user access assembly code to asm/uaccess-asm.h. This
moves the csdb, check_uaccess, uaccess_mask_range_ptr, uaccess_enable,
uaccess_disable, uaccess_save, uaccess_restore macros, and creates two
new ones for exception entry and exit - uaccess_entry and uaccess_exit.

This makes the uaccess_save and uaccess_restore macros private to
asm/uaccess-asm.h.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm/include/asm/assembler.h | 75 +-------------------
arch/arm/include/asm/uaccess-asm.h | 106 +++++++++++++++++++++++++++++
arch/arm/kernel/entry-armv.S | 11 +--
arch/arm/kernel/entry-header.S | 9 +--
4 files changed, 112 insertions(+), 89 deletions(-)
create mode 100644 arch/arm/include/asm/uaccess-asm.h

diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h
index c9ed0b0e0737..1cd39b1229eb 100644
--- a/arch/arm/include/asm/assembler.h
+++ b/arch/arm/include/asm/assembler.h
@@ -21,11 +21,11 @@
#endif

#include <asm/ptrace.h>
-#include <asm/domain.h>
#include <asm/opcodes-virt.h>
#include <asm/asm-offsets.h>
#include <asm/page.h>
#include <asm/thread_info.h>
+#include <asm/uaccess-asm.h>

#define IOMEM(x) (x)

@@ -445,79 +445,6 @@ THUMB( orr \reg , \reg , #PSR_T_BIT )
.size \name , . - \name
.endm

- .macro csdb
-#ifdef CONFIG_THUMB2_KERNEL
- .inst.w 0xf3af8014
-#else
- .inst 0xe320f014
-#endif
- .endm
-
- .macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req
-#ifndef CONFIG_CPU_USE_DOMAINS
- adds \tmp, \addr, #\size - 1
- sbcscc \tmp, \tmp, \limit
- bcs \bad
-#ifdef CONFIG_CPU_SPECTRE
- movcs \addr, #0
- csdb
-#endif
-#endif
- .endm
-
- .macro uaccess_mask_range_ptr, addr:req, size:req, limit:req, tmp:req
-#ifdef CONFIG_CPU_SPECTRE
- sub \tmp, \limit, #1
- subs \tmp, \tmp, \addr @ tmp = limit - 1 - addr
- addhs \tmp, \tmp, #1 @ if (tmp >= 0) {
- subshs \tmp, \tmp, \size @ tmp = limit - (addr + size) }
- movlo \addr, #0 @ if (tmp < 0) addr = NULL
- csdb
-#endif
- .endm
-
- .macro uaccess_disable, tmp, isb=1
-#ifdef CONFIG_CPU_SW_DOMAIN_PAN
- /*
- * Whenever we re-enter userspace, the domains should always be
- * set appropriately.
- */
- mov \tmp, #DACR_UACCESS_DISABLE
- mcr p15, 0, \tmp, c3, c0, 0 @ Set domain register
- .if \isb
- instr_sync
- .endif
-#endif
- .endm
-
- .macro uaccess_enable, tmp, isb=1
-#ifdef CONFIG_CPU_SW_DOMAIN_PAN
- /*
- * Whenever we re-enter userspace, the domains should always be
- * set appropriately.
- */
- mov \tmp, #DACR_UACCESS_ENABLE
- mcr p15, 0, \tmp, c3, c0, 0
- .if \isb
- instr_sync
- .endif
-#endif
- .endm
-
- .macro uaccess_save, tmp
-#ifdef CONFIG_CPU_SW_DOMAIN_PAN
- mrc p15, 0, \tmp, c3, c0, 0
- str \tmp, [sp, #SVC_DACR]
-#endif
- .endm
-
- .macro uaccess_restore
-#ifdef CONFIG_CPU_SW_DOMAIN_PAN
- ldr r0, [sp, #SVC_DACR]
- mcr p15, 0, r0, c3, c0, 0
-#endif
- .endm
-
.irp c,,eq,ne,cs,cc,mi,pl,vs,vc,hi,ls,ge,lt,gt,le,hs,lo
.macro ret\c, reg
#if __LINUX_ARM_ARCH__ < 6
diff --git a/arch/arm/include/asm/uaccess-asm.h b/arch/arm/include/asm/uaccess-asm.h
new file mode 100644
index 000000000000..d475e3e8145d
--- /dev/null
+++ b/arch/arm/include/asm/uaccess-asm.h
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ASM_UACCESS_ASM_H__
+#define __ASM_UACCESS_ASM_H__
+
+#include <asm/asm-offsets.h>
+#include <asm/domain.h>
+#include <asm/memory.h>
+#include <asm/thread_info.h>
+
+ .macro csdb
+#ifdef CONFIG_THUMB2_KERNEL
+ .inst.w 0xf3af8014
+#else
+ .inst 0xe320f014
+#endif
+ .endm
+
+ .macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req
+#ifndef CONFIG_CPU_USE_DOMAINS
+ adds \tmp, \addr, #\size - 1
+ sbcscc \tmp, \tmp, \limit
+ bcs \bad
+#ifdef CONFIG_CPU_SPECTRE
+ movcs \addr, #0
+ csdb
+#endif
+#endif
+ .endm
+
+ .macro uaccess_mask_range_ptr, addr:req, size:req, limit:req, tmp:req
+#ifdef CONFIG_CPU_SPECTRE
+ sub \tmp, \limit, #1
+ subs \tmp, \tmp, \addr @ tmp = limit - 1 - addr
+ addhs \tmp, \tmp, #1 @ if (tmp >= 0) {
+ subshs \tmp, \tmp, \size @ tmp = limit - (addr + size) }
+ movlo \addr, #0 @ if (tmp < 0) addr = NULL
+ csdb
+#endif
+ .endm
+
+ .macro uaccess_disable, tmp, isb=1
+#ifdef CONFIG_CPU_SW_DOMAIN_PAN
+ /*
+ * Whenever we re-enter userspace, the domains should always be
+ * set appropriately.
+ */
+ mov \tmp, #DACR_UACCESS_DISABLE
+ mcr p15, 0, \tmp, c3, c0, 0 @ Set domain register
+ .if \isb
+ instr_sync
+ .endif
+#endif
+ .endm
+
+ .macro uaccess_enable, tmp, isb=1
+#ifdef CONFIG_CPU_SW_DOMAIN_PAN
+ /*
+ * Whenever we re-enter userspace, the domains should always be
+ * set appropriately.
+ */
+ mov \tmp, #DACR_UACCESS_ENABLE
+ mcr p15, 0, \tmp, c3, c0, 0
+ .if \isb
+ instr_sync
+ .endif
+#endif
+ .endm
+
+ .macro uaccess_save, tmp
+#ifdef CONFIG_CPU_SW_DOMAIN_PAN
+ mrc p15, 0, \tmp, c3, c0, 0
+ str \tmp, [sp, #SVC_DACR]
+#endif
+ .endm
+
+ .macro uaccess_restore
+#ifdef CONFIG_CPU_SW_DOMAIN_PAN
+ ldr r0, [sp, #SVC_DACR]
+ mcr p15, 0, r0, c3, c0, 0
+#endif
+ .endm
+
+ /*
+ * Save the address limit on entry to a privileged exception and
+ * if using PAN, save and disable usermode access.
+ */
+ .macro uaccess_entry, tsk, tmp0, tmp1, tmp2, disable
+ ldr \tmp0, [\tsk, #TI_ADDR_LIMIT]
+ mov \tmp1, #TASK_SIZE
+ str \tmp1, [\tsk, #TI_ADDR_LIMIT]
+ str \tmp0, [sp, #SVC_ADDR_LIMIT]
+ uaccess_save \tmp0
+ .if \disable
+ uaccess_disable \tmp0
+ .endif
+ .endm
+
+ /* Restore the user access state previously saved by uaccess_entry */
+ .macro uaccess_exit, tsk, tmp0, tmp1
+ ldr \tmp1, [sp, #SVC_ADDR_LIMIT]
+ uaccess_restore
+ str \tmp1, [\tsk, #TI_ADDR_LIMIT]
+ .endm
+
+#endif /* __ASM_UACCESS_ASM_H__ */
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 9f157e7c51e7..efffca3c66e7 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -30,6 +30,7 @@
#include <asm/unistd.h>
#include <asm/tls.h>
#include <asm/system_info.h>
+#include <asm/uaccess-asm.h>

#include "entry-header.S"
#include <asm/entry-macro-multi.S>
@@ -186,15 +187,7 @@ ENDPROC(__und_invalid)
stmia r7, {r2 - r6}

get_thread_info tsk
- ldr r0, [tsk, #TI_ADDR_LIMIT]
- mov r1, #TASK_SIZE
- str r1, [tsk, #TI_ADDR_LIMIT]
- str r0, [sp, #SVC_ADDR_LIMIT]
-
- uaccess_save r0
- .if \uaccess
- uaccess_disable r0
- .endif
+ uaccess_entry tsk, r0, r1, r2, \uaccess

.if \trace
#ifdef CONFIG_TRACE_IRQFLAGS
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index fa7c6e5c17e7..f9287e65722e 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -5,6 +5,7 @@
#include <asm/asm-offsets.h>
#include <asm/errno.h>
#include <asm/thread_info.h>
+#include <asm/uaccess-asm.h>
#include <asm/v7m.h>

@ Bad Abort numbers
@@ -215,9 +216,7 @@
blne trace_hardirqs_off
#endif
.endif
- ldr r1, [sp, #SVC_ADDR_LIMIT]
- uaccess_restore
- str r1, [tsk, #TI_ADDR_LIMIT]
+ uaccess_exit tsk, r0, r1

#ifndef CONFIG_THUMB2_KERNEL
@ ARM mode SVC restore
@@ -261,9 +260,7 @@
@ on the stack remains correct).
@
.macro svc_exit_via_fiq
- ldr r1, [sp, #SVC_ADDR_LIMIT]
- uaccess_restore
- str r1, [tsk, #TI_ADDR_LIMIT]
+ uaccess_exit tsk, r0, r1
#ifndef CONFIG_THUMB2_KERNEL
@ ARM mode restore
mov r0, sp
--
2.25.1


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