gcc/testsuite/gcc.target/i386/iamcu/args.h

#ifndef INCLUDED_ARGS_H
#define INCLUDED_ARGS_H

/* This defines the calling sequences for integers and floats.  */
#define I0 eax
#define I1 edx
#define I2 ecx

typedef unsigned int size_t;

extern void (*callthis)(void);
extern unsigned long eax,ebx,ecx,edx,esi,edi,esp,ebp;
extern unsigned long sret_eax;
extern volatile unsigned long volatile_var;
extern void snapshot (void);
extern void snapshot_ret (void);
extern void *iamcu_memset (void *, int, size_t);
#define WRAP_CALL(N) \
  (callthis = (void (*)()) (N), (typeof (&N)) snapshot)
#define WRAP_RET(N) \
  (callthis = (void (*)()) (N), (typeof (&N)) snapshot_ret)

/* Clear all scratch integer registers.  */
#define clear_int_hardware_registers \
  asm __volatile__ ("xor %%eax, %%eax\n\t" \
		    "xor %%edx, %%edx\n\t" \
		    "xor %%ecx, %%ecx\n\t" \
		    ::: "eax", "edx", "ecx");

/* Clear all scratch integer registers, excluding the one used to return
   aggregate.  */
#define clear_non_sret_int_hardware_registers \
  asm __volatile__ ("xor %%edx, %%edx\n\t" \
		    "xor %%ecx, %%ecx\n\t" \
		    ::: "edx", "ecx");

/* This is the list of registers available for passing arguments. Not all of
   these are used or even really available.  */
struct IntegerRegisters
{
  unsigned long eax, ebx, ecx, edx, esi, edi;
};

/* Implemented in scalarargs.c  */
extern struct IntegerRegisters iregs, iregbits;
extern unsigned int num_iregs;

#define check_int_arguments do { \
  assert (num_iregs <= 0 || (iregs.I0 & iregbits.I0) == (I0 & iregbits.I0)); \
  assert (num_iregs <= 1 || (iregs.I1 & iregbits.I1) == (I1 & iregbits.I1)); \
  assert (num_iregs <= 2 || (iregs.I2 & iregbits.I2) == (I2 & iregbits.I2)); \
  } while (0)

#define check_char_arguments check_int_arguments
#define check_short_arguments check_int_arguments
#define check_long_arguments check_int_arguments
#define check_float_arguments check_int_arguments
#define check_double_arguments check_int_arguments
#define check_ldouble_arguments check_int_arguments

/* Clear register struct.  */
#define clear_struct_registers \
  eax = edx = ecx = 0; \
  iamcu_memset (&iregs, 0, sizeof iregs);

/* Clear both hardware and register structs for integers.  */
#define clear_int_registers \
  clear_struct_registers \
  clear_int_hardware_registers

/* Clear both hardware and register structs for integers, excluding the
   one used to return aggregate.  */
#define clear_non_sret_int_registers \
  clear_struct_registers \
  clear_non_sret_int_hardware_registers

#endif /* INCLUDED_ARGS_H  */