@@ -2,6 +2,9 @@
#ifndef __ASM_ASM_EXTABLE_H
#define __ASM_ASM_EXTABLE_H
+#include <linux/bits.h>
+#include <asm/gpr-num.h>
+
#define EX_TYPE_NONE 0
#define EX_TYPE_FIXUP 1
#define EX_TYPE_BPF 2
@@ -32,12 +35,32 @@
.short (data); \
.popsection;
+#define _ASM_EXTABLE(insn, fixup) \
+ __ASM_EXTABLE_RAW(insn, fixup, EX_TYPE_FIXUP, 0)
+
+#define EX_DATA_REG(reg, gpr) \
+ (.L__gpr_num_##gpr << EX_DATA_REG_##reg##_SHIFT)
+
+#define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \
+ __ASM_EXTABLE_RAW(insn, fixup, \
+ EX_TYPE_UACCESS_ERR_ZERO, \
+ ( \
+ EX_DATA_REG(ERR, err) | \
+ EX_DATA_REG(ZERO, zero) \
+ ))
+
+#define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \
+ _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, wzr)
+
+#define _ASM_EXTABLE_UACCESS(insn, fixup) \
+ _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, wzr, wzr)
+
/*
* Create an exception table entry for `insn`, which will branch to `fixup`
* when an unhandled fault is taken.
*/
.macro _asm_extable, insn, fixup
- __ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_FIXUP, 0)
+ _ASM_EXTABLE(\insn, \fixup)
.endm
/*
@@ -52,11 +75,8 @@
#else /* __ASSEMBLY__ */
-#include <linux/bits.h>
#include <linux/stringify.h>
-#include <asm/gpr-num.h>
-
#define __ASM_EXTABLE_RAW(insn, fixup, type, data) \
".pushsection __ex_table, \"a\"\n" \
".align 2\n" \
@@ -93,6 +113,9 @@
#define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err) \
_ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, wzr)
+#define _ASM_EXTABLE_UACCESS(insn, fixup) \
+ _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, wzr, wzr)
+
#define _ASM_EXTABLE_KACCESS_ERR(insn, fixup, err) \
_ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, wzr)
In subsequent patches we want to explciitly annotate uaccess fixups in assembly files. We have existing helpers for this for inline assembly, but due to differing stringification requirements it's not possible to have a single definition that we can use for both inline asm and plain asm files. So as with other cases (e.g. gpr-regnum.h), we must prove separate helprs for plain asm and inline asm. So that we can do so, this patch adds helpers to define EX_TYPE_UACCESS_ERR_ZERO fixups in plain assembly. These correspond 1-1 with the inline assembly versions except for the absence of stringification. No plain assmebly heleprs are added for EX_TYPE_LOAD_UNALIGNED_ZEROPAD fixups as these only exist for a single C function. For copy_{to,from}_user() we'll need fixups with regs and err, so I've added _ASM_EXTABLE_UACCESS(insn, fixup), where both the error and zero registers are WZR. For clarity, the existing `_asm_extable` assemgbly maco is now defined in terms of the _ASM_EXTABLE() CPP macro, making the CPP macros canonical in all cases. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Tong Tiangen <tongtiangen@huawei.com> --- arch/arm64/include/asm/asm-extable.h | 31 ++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-)