Messages in this thread | | | Date | Fri, 12 Aug 2022 18:19:07 +0800 | Subject | Re: [PATCH -next] riscv: extable: add new extable type EX_TYPE_KACCESS_ERR_ZERO support | From | Tong Tiangen <> |
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在 2022/8/12 16:58, Conor.Dooley@microchip.com 写道: > On 12/08/2022 09:52, Tong Tiangen wrote: >> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe >> >> Currently, The extable type EX_TYPE_UACCESS_ERR_ZERO is used by >> __get/put_kernel_nofault(), but those helpers are not uaccess type, so we >> add a new extable type EX_TYPE_KACCESS_ERR_ZERO which can be used by >> __get/put_kernel_no_fault(). >> >> Also change the name of __get/put_user_nocheck to __get/put_mem_nocheck >> to make it conform to its use situation (not only used in uaccess). > > Is there a reason why this should not be a different patch? > Thanks, > Conor.
Oh, my fault, this modification should be split. Thanks, Tong.
> >> >> Signed-off-by: Tong Tiangen <tongtiangen@huawei.com> >> --- >> arch/riscv/include/asm/asm-extable.h | 12 ++ >> arch/riscv/include/asm/uaccess.h | 160 +++++++++++++-------------- >> 2 files changed, 92 insertions(+), 80 deletions(-) >> >> diff --git a/arch/riscv/include/asm/asm-extable.h b/arch/riscv/include/asm/asm-extable.h >> index 14be0673f5b5..73c70098a9c8 100644 >> --- a/arch/riscv/include/asm/asm-extable.h >> +++ b/arch/riscv/include/asm/asm-extable.h >> @@ -6,6 +6,7 @@ >> #define EX_TYPE_FIXUP 1 >> #define EX_TYPE_BPF 2 >> #define EX_TYPE_UACCESS_ERR_ZERO 3 >> +#define EX_TYPE_KACCESS_ERR_ZERO 4 >> >> #ifdef __ASSEMBLY__ >> >> @@ -57,9 +58,20 @@ >> EX_DATA_REG(ZERO, zero) \ >> ")") >> >> +#define _ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, zero) \ >> + __DEFINE_ASM_GPR_NUMS \ >> + __ASM_EXTABLE_RAW(#insn, #fixup, \ >> + __stringify(EX_TYPE_KACCESS_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, zero) >> >> +#define _ASM_EXTABLE_KACCESS_ERR(insn, fixup, err) \ >> + _ASM_EXTABLE_KACCESS_ERR_ZERO(insn, fixup, err, zero) >> #endif /* __ASSEMBLY__ */ >> >> #endif /* __ASM_ASM_EXTABLE_H */ >> diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h >> index 855450bed9f5..5372f3f1e3f6 100644 >> --- a/arch/riscv/include/asm/uaccess.h >> +++ b/arch/riscv/include/asm/uaccess.h >> @@ -50,62 +50,62 @@ >> * call. >> */ >> >> -#define __get_user_asm(insn, x, ptr, err) \ >> -do { \ >> - __typeof__(x) __x; \ >> - __asm__ __volatile__ ( \ >> - "1:\n" \ >> - " " insn " %1, %2\n" \ >> - "2:\n" \ >> - _ASM_EXTABLE_UACCESS_ERR_ZERO(1b, 2b, %0, %1) \ >> - : "+r" (err), "=&r" (__x) \ >> - : "m" (*(ptr))); \ >> - (x) = __x; \ >> +#define __get_mem_asm(insn, x, ptr, err, type) \ >> +do { \ >> + __typeof__(x) __x; \ >> + __asm__ __volatile__ ( \ >> + "1:\n" \ >> + " " insn " %1, %2\n" \ >> + "2:\n" \ >> + _ASM_EXTABLE_##type##ACCESS_ERR_ZERO(1b, 2b, %0, %1) \ >> + : "+r" (err), "=&r" (__x) \ >> + : "m" (*(ptr))); \ >> + (x) = __x; \ >> } while (0) >> >> #ifdef CONFIG_64BIT >> -#define __get_user_8(x, ptr, err) \ >> - __get_user_asm("ld", x, ptr, err) >> +#define __get_mem_8(x, ptr, err, type) \ >> + __get_mem_asm("ld", x, ptr, err, type) >> #else /* !CONFIG_64BIT */ >> -#define __get_user_8(x, ptr, err) \ >> -do { \ >> - u32 __user *__ptr = (u32 __user *)(ptr); \ >> - u32 __lo, __hi; \ >> - __asm__ __volatile__ ( \ >> - "1:\n" \ >> - " lw %1, %3\n" \ >> - "2:\n" \ >> - " lw %2, %4\n" \ >> - "3:\n" \ >> - _ASM_EXTABLE_UACCESS_ERR_ZERO(1b, 3b, %0, %1) \ >> - _ASM_EXTABLE_UACCESS_ERR_ZERO(2b, 3b, %0, %1) \ >> - : "+r" (err), "=&r" (__lo), "=r" (__hi) \ >> - : "m" (__ptr[__LSW]), "m" (__ptr[__MSW])); \ >> - if (err) \ >> - __hi = 0; \ >> - (x) = (__typeof__(x))((__typeof__((x)-(x)))( \ >> - (((u64)__hi << 32) | __lo))); \ >> +#define __get_mem_8(x, ptr, err, type) \ >> +do { \ >> + u32 __user *__ptr = (u32 __user *)(ptr); \ >> + u32 __lo, __hi; \ >> + __asm__ __volatile__ ( \ >> + "1:\n" \ >> + " lw %1, %3\n" \ >> + "2:\n" \ >> + " lw %2, %4\n" \ >> + "3:\n" \ >> + _ASM_EXTABLE_##type##ACCESS_ERR_ZERO(1b, 3b, %0, %1) \ >> + _ASM_EXTABLE_##type##ACCESS_ERR_ZERO(2b, 3b, %0, %1) \ >> + : "+r" (err), "=&r" (__lo), "=r" (__hi) \ >> + : "m" (__ptr[__LSW]), "m" (__ptr[__MSW])); \ >> + if (err) \ >> + __hi = 0; \ >> + (x) = (__typeof__(x))((__typeof__((x)-(x)))( \ >> + (((u64)__hi << 32) | __lo))); \ >> } while (0) >> #endif /* CONFIG_64BIT */ >> >> -#define __get_user_nocheck(x, __gu_ptr, __gu_err) \ >> -do { \ >> - switch (sizeof(*__gu_ptr)) { \ >> - case 1: \ >> - __get_user_asm("lb", (x), __gu_ptr, __gu_err); \ >> - break; \ >> - case 2: \ >> - __get_user_asm("lh", (x), __gu_ptr, __gu_err); \ >> - break; \ >> - case 4: \ >> - __get_user_asm("lw", (x), __gu_ptr, __gu_err); \ >> - break; \ >> - case 8: \ >> - __get_user_8((x), __gu_ptr, __gu_err); \ >> - break; \ >> - default: \ >> - BUILD_BUG(); \ >> - } \ >> +#define __get_mem_nocheck(x, __gu_ptr, __gu_err, type) \ >> +do { \ >> + switch (sizeof(*__gu_ptr)) { \ >> + case 1: \ >> + __get_mem_asm("lb", (x), __gu_ptr, __gu_err, type); \ >> + break; \ >> + case 2: \ >> + __get_mem_asm("lh", (x), __gu_ptr, __gu_err, type); \ >> + break; \ >> + case 4: \ >> + __get_mem_asm("lw", (x), __gu_ptr, __gu_err, type); \ >> + break; \ >> + case 8: \ >> + __get_mem_8((x), __gu_ptr, __gu_err, type); \ >> + break; \ >> + default: \ >> + BUILD_BUG(); \ >> + } \ >> } while (0) >> >> /** >> @@ -136,7 +136,7 @@ do { \ >> __chk_user_ptr(__gu_ptr); \ >> \ >> __enable_user_access(); \ >> - __get_user_nocheck(x, __gu_ptr, __gu_err); \ >> + __get_mem_nocheck(x, __gu_ptr, __gu_err, U); \ >> __disable_user_access(); \ >> \ >> __gu_err; \ >> @@ -163,28 +163,28 @@ do { \ >> ({ \ >> const __typeof__(*(ptr)) __user *__p = (ptr); \ >> might_fault(); \ >> - access_ok(__p, sizeof(*__p)) ? \ >> + access_ok(__p, sizeof(*__p)) ? \ >> __get_user((x), __p) : \ >> ((x) = 0, -EFAULT); \ >> }) >> >> -#define __put_user_asm(insn, x, ptr, err) \ >> +#define __put_mem_asm(insn, x, ptr, err, type) \ >> do { \ >> __typeof__(*(ptr)) __x = x; \ >> __asm__ __volatile__ ( \ >> "1:\n" \ >> " " insn " %z2, %1\n" \ >> "2:\n" \ >> - _ASM_EXTABLE_UACCESS_ERR(1b, 2b, %0) \ >> + _ASM_EXTABLE_##type##ACCESS_ERR(1b, 2b, %0) \ >> : "+r" (err), "=m" (*(ptr)) \ >> : "rJ" (__x)); \ >> } while (0) >> >> #ifdef CONFIG_64BIT >> -#define __put_user_8(x, ptr, err) \ >> - __put_user_asm("sd", x, ptr, err) >> +#define __put_mem_8(x, ptr, err, type) \ >> + __put_mem_asm("sd", x, ptr, err, type) >> #else /* !CONFIG_64BIT */ >> -#define __put_user_8(x, ptr, err) \ >> +#define __put_mem_8(x, ptr, err, type) \ >> do { \ >> u32 __user *__ptr = (u32 __user *)(ptr); \ >> u64 __x = (__typeof__((x)-(x)))(x); \ >> @@ -194,8 +194,8 @@ do { \ >> "2:\n" \ >> " sw %z4, %2\n" \ >> "3:\n" \ >> - _ASM_EXTABLE_UACCESS_ERR(1b, 3b, %0) \ >> - _ASM_EXTABLE_UACCESS_ERR(2b, 3b, %0) \ >> + _ASM_EXTABLE_##type##ACCESS_ERR(1b, 3b, %0) \ >> + _ASM_EXTABLE_##type##ACCESS_ERR(2b, 3b, %0) \ >> : "+r" (err), \ >> "=m" (__ptr[__LSW]), \ >> "=m" (__ptr[__MSW]) \ >> @@ -203,24 +203,24 @@ do { \ >> } while (0) >> #endif /* CONFIG_64BIT */ >> >> -#define __put_user_nocheck(x, __gu_ptr, __pu_err) \ >> -do { \ >> - switch (sizeof(*__gu_ptr)) { \ >> - case 1: \ >> - __put_user_asm("sb", (x), __gu_ptr, __pu_err); \ >> - break; \ >> - case 2: \ >> - __put_user_asm("sh", (x), __gu_ptr, __pu_err); \ >> - break; \ >> - case 4: \ >> - __put_user_asm("sw", (x), __gu_ptr, __pu_err); \ >> - break; \ >> - case 8: \ >> - __put_user_8((x), __gu_ptr, __pu_err); \ >> - break; \ >> - default: \ >> - BUILD_BUG(); \ >> - } \ >> +#define __put_mem_nocheck(x, __gu_ptr, __pu_err, type) \ >> +do { \ >> + switch (sizeof(*__gu_ptr)) { \ >> + case 1: \ >> + __put_mem_asm("sb", (x), __gu_ptr, __pu_err, type); \ >> + break; \ >> + case 2: \ >> + __put_mem_asm("sh", (x), __gu_ptr, __pu_err, type); \ >> + break; \ >> + case 4: \ >> + __put_mem_asm("sw", (x), __gu_ptr, __pu_err, type); \ >> + break; \ >> + case 8: \ >> + __put_mem_8((x), __gu_ptr, __pu_err, type); \ >> + break; \ >> + default: \ >> + BUILD_BUG(); \ >> + } \ >> } while (0) >> >> /** >> @@ -253,7 +253,7 @@ do { \ >> __chk_user_ptr(__gu_ptr); \ >> \ >> __enable_user_access(); \ >> - __put_user_nocheck(__val, __gu_ptr, __pu_err); \ >> + __put_mem_nocheck(__val, __gu_ptr, __pu_err, U); \ >> __disable_user_access(); \ >> \ >> __pu_err; \ >> @@ -279,7 +279,7 @@ do { \ >> ({ \ >> __typeof__(*(ptr)) __user *__p = (ptr); \ >> might_fault(); \ >> - access_ok(__p, sizeof(*__p)) ? \ >> + access_ok(__p, sizeof(*__p)) ? \ >> __put_user((x), __p) : \ >> -EFAULT; \ >> }) >> @@ -321,7 +321,7 @@ unsigned long __must_check clear_user(void __user *to, unsigned long n) >> do { \ >> long __kr_err; \ >> \ >> - __get_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \ >> + __get_mem_nocheck(*((type *)(dst)), (type *)(src), __kr_err, K);\ >> if (unlikely(__kr_err)) \ >> goto err_label; \ >> } while (0) >> @@ -330,7 +330,7 @@ do { \ >> do { \ >> long __kr_err; \ >> \ >> - __put_user_nocheck(*((type *)(src)), (type *)(dst), __kr_err); \ >> + __put_mem_nocheck(*((type *)(src)), (type *)(dst), __kr_err, K);\ >> if (unlikely(__kr_err)) \ >> goto err_label; \ >> } while (0) >> -- >> 2.25.1 >> >> >> _______________________________________________ >> linux-riscv mailing list >> linux-riscv@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-riscv >
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