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arm64: Move PSTATE.TCO setting to separate functions

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For consistency with __uaccess_{disable,enable}_hw_pan(), move the
PSTATE.TCO setting into dedicated __uaccess_{disable,enable}_tco()
functions.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
This commit is contained in:
Catalin Marinas 2021-01-04 12:36:14 +00:00
parent f34d93f30d
commit 83b5bd628f
1 changed files with 13 additions and 3 deletions
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16
arch/arm64/include/asm/uaccess.h
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@ -176,10 +176,21 @@ static inline void __uaccess_enable_hw_pan(void)
* The Tag check override (TCO) bit disables temporarily the tag checking
* preventing the issue.
*/
static inline void uaccess_disable_privileged(void)
static inline void __uaccess_disable_tco(void)
{
asm volatile(ALTERNATIVE("nop", SET_PSTATE_TCO(0),
ARM64_MTE, CONFIG_KASAN_HW_TAGS));
}
static inline void __uaccess_enable_tco(void)
{
asm volatile(ALTERNATIVE("nop", SET_PSTATE_TCO(1),
ARM64_MTE, CONFIG_KASAN_HW_TAGS));
}
static inline void uaccess_disable_privileged(void)
{
__uaccess_disable_tco();
if (uaccess_ttbr0_disable())
return;
@ -189,8 +200,7 @@ static inline void uaccess_disable_privileged(void)
static inline void uaccess_enable_privileged(void)
{
asm volatile(ALTERNATIVE("nop", SET_PSTATE_TCO(1),
ARM64_MTE, CONFIG_KASAN_HW_TAGS));
__uaccess_enable_tco();
if (uaccess_ttbr0_enable())
return;