checkasm: aarch64: Add filler args to make sure all parameters are passed on the stack

This, combined with clobbering the stack space prior to the call,
increases the chances of finding cases where 32 bit parameters
are erroneously treated as 64 bit.

Signed-off-by: Martin Storsjö <martin@martin.st>

tests/checkasm/aarch64/checkasm.S

@@ -93,22 +93,18 @@ function checkasm_checked_call, export=1
 
     sub         sp,  sp,  #ARG_STACK
 .equ pos, 0
-// the first stacked arg is copied to x7
 .rept MAX_ARGS-8
-    ldr         x9, [x29, #16 + 8 + pos]
+    // Skip the first 8 args, that are loaded into registers
+    ldr         x9, [x29, #16 + 8*8 + pos]
     str         x9, [sp, #pos]
 .equ pos, pos + 8
 .endr
 
     mov         x12, x0
-    mov         x0,  x1
-    mov         x1,  x2
-    mov         x2,  x3
-    mov         x3,  x4
-    mov         x4,  x5
-    mov         x5,  x6
-    mov         x6,  x7
-    ldr         x7,  [x29, #16]
+    ldp         x0,  x1,  [x29, #16]
+    ldp         x2,  x3,  [x29, #32]
+    ldp         x4,  x5,  [x29, #48]
+    ldp         x6,  x7,  [x29, #64]
     blr         x12
     add         sp,  sp,  #ARG_STACK
     stp         x0,  x1,  [sp, #-16]!

tests/checkasm/checkasm.h

@@ -136,11 +136,12 @@ extern void (*checkasm_checked_call)(void *func, int dummy, ...);
 #elif ARCH_AARCH64 && !defined(__APPLE__)
 void checkasm_stack_clobber(uint64_t clobber, ...);
 void checkasm_checked_call(void *func, ...);
-#define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
+#define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, int, int, __VA_ARGS__)\
+                              = (void *)checkasm_checked_call;
 #define CLOB (UINT64_C(0xdeadbeefdeadbeef))
 #define call_new(...) (checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
                                               CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
-                      checked_call(func_new, __VA_ARGS__))
+                      checked_call(func_new, 0, 0, 0, 0, 0, 0, 0, __VA_ARGS__))
 #else
 #define declare_new(ret, ...)
 #define declare_new_emms(cpu_flags, ret, ...)