C library: ASM functions take void* pointers

This is the type of the function symbol created by
`remove_asmt::gcc_asm_function_call`.

Author: tautschnig

src/ansi-c/library/x86_assembler.c

@@ -3,30 +3,30 @@
 
 extern int __CPROVER_rounding_mode;
 
-void __asm_fnstcw(unsigned short *dest)
+void __asm_fnstcw(void *dest)
 {
   // the rounding mode is bits 10 and 11 in the control word
-  *dest=__CPROVER_rounding_mode<<10;
+  *(unsigned short *)dest = __CPROVER_rounding_mode << 10;
 }
 
 /* FUNCTION: __asm_fstcw */
 
 extern int __CPROVER_rounding_mode;
 
-void __asm_fstcw(unsigned short *dest)
+void __asm_fstcw(void *dest)
 {
   // the rounding mode is bits 10 and 11 in the control word
-  *dest=__CPROVER_rounding_mode<<10;
+  *(unsigned short *)dest = __CPROVER_rounding_mode << 10;
 }
 
 /* FUNCTION: __asm_fldcw */
 
 extern int __CPROVER_rounding_mode;
 
-void __asm_fldcw(const unsigned short *src)
+void __asm_fldcw(void *src)
 {
   // the rounding mode is bits 10 and 11 in the control word
-  __CPROVER_rounding_mode=((*src)>>10)&3;
+  __CPROVER_rounding_mode = ((*(const unsigned short *)src) >> 10) & 3;
 }
 
 /* FUNCTION: __asm_mfence */