diff options
| author | Zong Li <zong@andestech.com> | 2018-08-13 16:02:53 +0800 |
|---|---|---|
| committer | Greentime Hu <greentime@andestech.com> | 2018-09-04 14:45:17 +0800 |
| commit | 487913ab18c215b06611c4c91c7e905fc0960eb8 (patch) | |
| tree | e03efb3ed02809614c82d6ce7dee734db3ee24d5 /arch/nds32 | |
| parent | 7ef39548df8cdb6406e3b4b7255e7f8cd3fe3b13 (diff) | |
| download | linux-0-day-487913ab18c215b06611c4c91c7e905fc0960eb8.tar.gz linux-0-day-487913ab18c215b06611c4c91c7e905fc0960eb8.tar.xz | |
nds32: Extract the checking and getting pointer to a macro
Signed-off-by: Zong Li <zong@andestech.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
Diffstat (limited to 'arch/nds32')
| -rw-r--r-- | arch/nds32/include/asm/uaccess.h | 80 |
1 files changed, 41 insertions, 39 deletions
diff --git a/arch/nds32/include/asm/uaccess.h b/arch/nds32/include/asm/uaccess.h index e1a2b5b749b9e..362a32d9bd168 100644 --- a/arch/nds32/include/asm/uaccess.h +++ b/arch/nds32/include/asm/uaccess.h @@ -75,54 +75,54 @@ static inline void set_fs(mm_segment_t fs) * versions are void (ie, don't return a value as such). */ -#define get_user(x, ptr) \ -({ \ - long __e = -EFAULT; \ - const __typeof__(*(ptr)) __user *__p = (ptr); \ - if (likely(access_ok(VERIFY_READ, __p, sizeof(*__p)))) { \ - __e = __get_user(x, __p); \ - } else { \ - (x) = 0; \ - } \ - __e; \ -}) +#define get_user __get_user \ #define __get_user(x, ptr) \ ({ \ long __gu_err = 0; \ - __get_user_err((x), (ptr), __gu_err); \ + __get_user_check((x), (ptr), __gu_err); \ __gu_err; \ }) #define __get_user_error(x, ptr, err) \ ({ \ - __get_user_err((x), (ptr), err); \ + __get_user_check((x), (ptr), (err)); \ (void)0; \ }) +#define __get_user_check(x, ptr, err) \ +({ \ + const __typeof__(*(ptr)) __user *__p = (ptr); \ + might_fault(); \ + if (access_ok(VERIFY_READ, __p, sizeof(*__p))) { \ + __get_user_err((x), __p, (err)); \ + } else { \ + (x) = 0; (err) = -EFAULT; \ + } \ +}) + #define __get_user_err(x, ptr, err) \ do { \ - const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \ unsigned long __gu_val; \ - __chk_user_ptr(__gu_addr); \ - switch (sizeof(*(__gu_addr))) { \ + __chk_user_ptr(ptr); \ + switch (sizeof(*(ptr))) { \ case 1: \ - __get_user_asm("lbi", __gu_val, __gu_addr, (err)); \ + __get_user_asm("lbi", __gu_val, (ptr), (err)); \ break; \ case 2: \ - __get_user_asm("lhi", __gu_val, __gu_addr, (err)); \ + __get_user_asm("lhi", __gu_val, (ptr), (err)); \ break; \ case 4: \ - __get_user_asm("lwi", __gu_val, __gu_addr, (err)); \ + __get_user_asm("lwi", __gu_val, (ptr), (err)); \ break; \ case 8: \ - __get_user_asm_dword(__gu_val, __gu_addr, (err)); \ + __get_user_asm_dword(__gu_val, (ptr), (err)); \ break; \ default: \ BUILD_BUG(); \ break; \ } \ - (x) = (__typeof__(*(__gu_addr)))__gu_val; \ + (x) = (__force __typeof__(*(ptr)))__gu_val; \ } while (0) #define __get_user_asm(inst, x, addr, err) \ @@ -170,15 +170,7 @@ do { \ : "r"(addr), "i"(-EFAULT) \ : "cc") -#define put_user(x, ptr) \ -({ \ - long __e = -EFAULT; \ - __typeof__(*(ptr)) __user *__p = (ptr); \ - if (likely(access_ok(VERIFY_WRITE, __p, sizeof(*__p)))) { \ - __e = __put_user(x, __p); \ - } \ - __e; \ -}) +#define put_user __put_user \ #define __put_user(x, ptr) \ ({ \ @@ -189,27 +181,37 @@ do { \ #define __put_user_error(x, ptr, err) \ ({ \ - __put_user_err((x), (ptr), err); \ + __put_user_err((x), (ptr), (err)); \ (void)0; \ }) +#define __put_user_check(x, ptr, err) \ +({ \ + __typeof__(*(ptr)) __user *__p = (ptr); \ + might_fault(); \ + if (access_ok(VERIFY_WRITE, __p, sizeof(*__p))) { \ + __put_user_err((x), __p, (err)); \ + } else { \ + (err) = -EFAULT; \ + } \ +}) + #define __put_user_err(x, ptr, err) \ do { \ - __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ - __typeof__(*(__pu_addr)) __pu_val = (x); \ - __chk_user_ptr(__pu_addr); \ - switch (sizeof(*(__pu_addr))) { \ + __typeof__(*(ptr)) __pu_val = (x); \ + __chk_user_ptr(ptr); \ + switch (sizeof(*(ptr))) { \ case 1: \ - __put_user_asm("sbi", __pu_val, __pu_addr, (err)); \ + __put_user_asm("sbi", __pu_val, (ptr), (err)); \ break; \ case 2: \ - __put_user_asm("shi", __pu_val, __pu_addr, (err)); \ + __put_user_asm("shi", __pu_val, (ptr), (err)); \ break; \ case 4: \ - __put_user_asm("swi", __pu_val, __pu_addr, (err)); \ + __put_user_asm("swi", __pu_val, (ptr), (err)); \ break; \ case 8: \ - __put_user_asm_dword(__pu_val, __pu_addr, (err)); \ + __put_user_asm_dword(__pu_val, (ptr), (err)); \ break; \ default: \ BUILD_BUG(); \ |