BUG: unsigned int is not enough for passing pointers to machine_call

[pranjalchanda08]

Describe the bug
Using unsigned int means restricting the size to 2 or 4 bytes max which does not comply with pointers which can acquire up-to 8 bytes of space when using pointers. Hence it is a huge vulnerability for inter-arch switch.

Expected behavior
To be able to pass pointers through the mcalls irrespective of any arch.

Workaround
To introduce a user-defined type which switches between the data-type sizes as required.

Eg:

#if defined(ARCH_ARM_32)
#define __CALL_ARG_TYPE__ unsigned long

#elif defined(ARCH_RISCV_64) || defined(ARCH_ARM_64)
#define __CALL_ARG_TYPE__ unsigned long

#else
#define __CALL_ARG_TYPE__ unsigned int

#endif

typedef __CALL_ARG_TYPE__ call_args;

[pranjalchanda08]

The changes are performed in respective arch.h