97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* Automatique. Distributed only by permission. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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/* Machine-dependent interface with the asm code */
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#ifndef _stack_
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#define _stack_
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/* Macros to access the stack frame */
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#ifdef TARGET_alpha
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#define NUM_GC_REGS 31
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#define Saved_return_address(sp) *((long *)(sp - 8))
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#define Already_scanned(sp, retaddr) (retaddr & 1L)
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#define Mark_scanned(sp, retaddr) (*((long *)(sp - 8)) = retaddr | 1L)
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#define Mask_already_scanned(retaddr) (retaddr & ~1L)
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#define Callback_link(sp) (*(struct caml_context **)(sp + 16))
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#endif
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#ifdef TARGET_sparc
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#define NUM_GC_REGS 25
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#define Saved_return_address(sp) *((long *)(sp - 4))
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#define Callback_link(sp) (*(struct caml_context **)(sp + 8))
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#endif
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#ifdef TARGET_i386
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#define NUM_GC_REGS 7
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#define Saved_return_address(sp) *((long *)(sp - 4))
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#define Callback_link(sp) (*(struct caml_context **)(sp + 8))
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#endif
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#ifdef TARGET_mips
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#define NUM_GC_REGS 32
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#define Saved_return_address(sp) *((long *)(sp - 4))
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#define Callback_link(sp) (*(struct caml_context **)(sp + 8))
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#endif
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#ifdef TARGET_hppa
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#define NUM_GC_REGS 32
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#define Stack_grows_upwards
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#define Saved_return_address(sp) *((long *)sp)
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#define Callback_link(sp) (*(struct caml_context **)(sp - 16))
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#endif
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#ifdef TARGET_power
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#define NUM_GC_REGS 32
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#define Saved_return_address(sp) *((long *)(sp - 4))
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#define Already_scanned(sp, retaddr) (retaddr & 1)
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#define Mark_scanned(sp, retaddr) (*((long *)(sp - 4)) = retaddr | 1)
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#define Mask_already_scanned(retaddr) (retaddr & ~1)
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#ifdef SYS_aix
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#define Trap_frame_size 24
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#else
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#define Trap_frame_size 8
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#endif
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#define Callback_link(sp) (*(struct caml_context **)(sp + Trap_frame_size))
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#endif
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#ifdef TARGET_m68k
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#define NUM_GC_REGS 7
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#define Saved_return_address(sp) *((long *)(sp - 4))
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#define Callback_link(sp) (*(struct caml_context **)(sp + 8))
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#endif
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/* Structure of Caml contexts in the stack */
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struct caml_context {
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value gc_regs[NUM_GC_REGS]; /* registers containing heap addresses */
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unsigned long last_retaddr; /* last return address in Caml code */
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char stack_chunk[sizeof(value)]; /* beginning of the stack chunk */
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};
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/* Structure of a Caml stack chunk is:
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- pointer to context for previous chunk
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- frame with return address into callback (negative frame size)
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- regular Caml frames
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- context for this chunk
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*/
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/* Declaration of variables defined in the asm code */
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extern struct caml_context * caml_last_context;
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extern char * caml_exception_pointer;
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extern value caml_globals[];
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extern long * caml_frametable[];
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#endif /* _stack_ */
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