extern void __put_user_nocheck_4(void);
extern void __put_user_nocheck_8(void);
+/*
+ * ptr must be evaluated and assigned to the temporary __ptr_pu before
+ * the assignment of x to __val_pu, to avoid any function calls
+ * involved in the ptr expression (possibly implicitly generated due
+ * to KASAN) from clobbering %ax.
+ */
#define do_put_user_call(fn,x,ptr) \
({ \
int __ret_pu; \
+ void __user *__ptr_pu; \
register __typeof__(*(ptr)) __val_pu asm("%"_ASM_AX); \
__chk_user_ptr(ptr); \
+ __ptr_pu = (ptr); \
__val_pu = (x); \
asm volatile("call __" #fn "_%P[size]" \
: "=c" (__ret_pu), \
ASM_CALL_CONSTRAINT \
- : "0" (ptr), \
+ : "0" (__ptr_pu), \
"r" (__val_pu), \
[size] "i" (sizeof(*(ptr))) \
:"ebx"); \