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arm64: extable: make uaaccess helper use extable type EX_TYPE_UACCESS_ERR_ZERO 

Currnetly, the extable type used by __arch_copy_from/to_user() is
EX_TYPE_FIXUP. In fact, It is more clearly to use meaningful
EX_TYPE_UACCESS_*.

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Link: https://lore.kernel.org/r/20220621072638.1273594-5-tongtiangen@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Tong Tiangen 2022-06-21 07:26:32 +00:00 committed by Will Deacon
parent 59e8a1ce8f
commit c4ed0d73ed
2 changed files with 14 additions and 6 deletions
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8
arch/arm64/include/asm/asm-extable.h
View File

@ -63,6 +63,14 @@
_ASM_EXTABLE(\insn, \fixup)
.endm
/*
* Create an exception table entry for uaccess `insn`, which will branch to `fixup`
* when an unhandled fault is taken.
*/
.macro _asm_extable_uaccess, insn, fixup
_ASM_EXTABLE_UACCESS(\insn, \fixup)
.endm
/*
* Create an exception table entry for `insn` if `fixup` is provided. Otherwise
* do nothing.

12
arch/arm64/include/asm/asm-uaccess.h
View File

@ -61,7 +61,7 @@ alternative_else_nop_endif
#define USER(l, x...) \
9999: x; \
_asm_extable 9999b, l
_asm_extable_uaccess 9999b, l
/*
* Generate the assembly for LDTR/STTR with exception table entries.
@ -73,8 +73,8 @@ alternative_else_nop_endif
8889: ldtr \reg2, [\addr, #8];
add \addr, \addr, \post_inc;
_asm_extable 8888b,\l;
_asm_extable 8889b,\l;
_asm_extable_uaccess 8888b, \l;
_asm_extable_uaccess 8889b, \l;
.endm
.macro user_stp l, reg1, reg2, addr, post_inc
@ -82,14 +82,14 @@ alternative_else_nop_endif
8889: sttr \reg2, [\addr, #8];
add \addr, \addr, \post_inc;
_asm_extable 8888b,\l;
_asm_extable 8889b,\l;
_asm_extable_uaccess 8888b,\l;
_asm_extable_uaccess 8889b,\l;
.endm
.macro user_ldst l, inst, reg, addr, post_inc
8888: \inst \reg, [\addr];
add \addr, \addr, \post_inc;
_asm_extable 8888b,\l;
_asm_extable_uaccess 8888b, \l;
.endm
#endif