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/***********************************************************************/
/* */
/* Objective Caml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* Automatique. Distributed only by permission. */
/* */
/***********************************************************************/
/* $Id$ */
/* Machine-dependent macros to access the stack frames. */
#ifndef _stack_
#define _stack_
#ifdef TARGET_alpha
#define Saved_return_address(sp) *((long *)(sp - 8))
#define Already_scanned(sp, retaddr) (retaddr & 1)
#define Mark_scanned(sp, retaddr) (*((long *)(sp - 8)) = retaddr | 1)
#define Mask_already_scanned(retaddr) (retaddr & ~1)
#define Callback_link(sp) ((struct callback_link *)(sp + 16))
#endif
#ifdef TARGET_sparc
#define Saved_return_address(sp) *((long *)(sp + 92))
#define Callback_link(sp) ((struct callback_link *)(sp + 104))
#endif
#ifdef TARGET_i386
#define Saved_return_address(sp) *((long *)(sp - 4))
#define Callback_link(sp) ((struct callback_link *)(sp + 8))
#endif
#ifdef TARGET_mips
#define Saved_return_address(sp) *((long *)(sp - 4))
#define Callback_link(sp) ((struct callback_link *)(sp + 8))
#endif
#ifdef TARGET_hppa
#define Stack_grows_upwards
#define Saved_return_address(sp) *((long *)sp)
#define Callback_link(sp) ((struct callback_link *)(sp - 16))
#endif
#ifdef TARGET_power
#define Saved_return_address(sp) *((long *)(sp - 4))
#define Already_scanned(sp, retaddr) (retaddr & 1)
#define Mark_scanned(sp, retaddr) (*((long *)(sp - 4)) = retaddr | 1)
#define Mask_already_scanned(retaddr) (retaddr & ~1)
#ifdef SYS_aix
#define Trap_frame_size 24
#else
#define Trap_frame_size 8
#endif
#define Callback_link(sp) ((struct callback_link *)(sp + Trap_frame_size))
#endif
#ifdef TARGET_m68k
#define Saved_return_address(sp) *((long *)(sp - 4))
#define Callback_link(sp) ((struct callback_link *)(sp + 8))
#endif
#endif /* _stack_ */
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