tm-rs6000.h

arm-linux-gcc编译器

/* Parameters for target execution on an RS6000, for GDB, the GNU debugger.
   Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1997
   Free Software Foundation, Inc.
   Contributed by IBM Corporation.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* Forward decls for prototypes */
struct frame_info;
struct type;
struct value;

/* Minimum possible text address in AIX */

#define TEXT_SEGMENT_BASE	0x10000000

/* Load segment of a given pc value. */

#define	PC_LOAD_SEGMENT(PC)	pc_load_segment_name(PC)
extern char *pc_load_segment_name PARAMS ((CORE_ADDR));

/* AIX cc seems to get this right.  */

#define BELIEVE_PCC_PROMOTION 1

/* return true if a given `pc' value is in `call dummy' function. */
/* FIXME: This just checks for the end of the stack, which is broken
   for things like stepping through gcc nested function stubs.  */
#define	PC_IN_CALL_DUMMY(STOP_PC, STOP_SP, STOP_FRAME_ADDR)	\
	(STOP_SP < STOP_PC && STOP_PC < STACK_END_ADDR)

#if 0
extern unsigned int text_start, data_start;
extern char *corefile;
#endif
extern int inferior_pid;

/* We are missing register descriptions in the system header files. Sigh! */

struct regs
  {
    int gregs[32];		/* general purpose registers */
    int pc;			/* program conter       */
    int ps;			/* processor status, or machine state */
  };

struct fp_status
  {
    double fpregs[32];		/* floating GP registers */
  };


/* To be used by skip_prologue. */

struct rs6000_framedata
  {
    int offset;			/* total size of frame --- the distance
				   by which we decrement sp to allocate
				   the frame */
    int saved_gpr;		/* smallest # of saved gpr */
    int saved_fpr;		/* smallest # of saved fpr */
    int alloca_reg;		/* alloca register number (frame ptr) */
    char frameless;		/* true if frameless functions. */
    char nosavedpc;		/* true if pc not saved. */
    int gpr_offset;		/* offset of saved gprs from prev sp */
    int fpr_offset;		/* offset of saved fprs from prev sp */
    int lr_offset;		/* offset of saved lr */
    int cr_offset;		/* offset of saved cr */
  };

/* Define the byte order of the machine.  */

#define TARGET_BYTE_ORDER_DEFAULT	BIG_ENDIAN

/* AIX's assembler doesn't grok dollar signs in identifiers.
   So we use dots instead.  This item must be coordinated with G++. */
#undef CPLUS_MARKER
#define CPLUS_MARKER '.'

/* Offset from address of function to start of its code.
   Zero on most machines.  */

#define FUNCTION_START_OFFSET 0

/* Advance PC across any function entry prologue instructions
   to reach some "real" code.  */

extern CORE_ADDR rs6000_skip_prologue PARAMS ((CORE_ADDR));
#define SKIP_PROLOGUE(pc) (rs6000_skip_prologue (pc))

extern CORE_ADDR skip_prologue PARAMS ((CORE_ADDR, struct rs6000_framedata *));


/* If PC is in some function-call trampoline code, return the PC
   where the function itself actually starts.  If not, return NULL.  */

#define	SKIP_TRAMPOLINE_CODE(pc)	skip_trampoline_code (pc)
extern CORE_ADDR skip_trampoline_code PARAMS ((CORE_ADDR));

/* Number of trap signals we need to skip over, once the inferior process
   starts running. */

#define	START_INFERIOR_TRAPS_EXPECTED	2

/* AIX has a couple of strange returns from wait().  */

#define CHILD_SPECIAL_WAITSTATUS(ourstatus, hoststatus) ( \
  /* "stop after load" status.  */ \
  (hoststatus) == 0x57c ? (ourstatus)->kind = TARGET_WAITKIND_LOADED, 1 : \
  \
  /* signal 0. I have no idea why wait(2) returns with this status word.  */ \
  /* It looks harmless. */ \
  (hoststatus) == 0x7f ? (ourstatus)->kind = TARGET_WAITKIND_SPURIOUS, 1 : \
  \
  /* A normal waitstatus.  Let the usual macros deal with it.  */ \
  0)

/* In xcoff, we cannot process line numbers when we see them. This is
   mainly because we don't know the boundaries of the include files. So,
   we postpone that, and then enter and sort(?) the whole line table at
   once, when we are closing the current symbol table in end_symtab(). */

#define	PROCESS_LINENUMBER_HOOK()	aix_process_linenos ()
extern void aix_process_linenos PARAMS ((void));

/* Immediately after a function call, return the saved pc.
   Can't go through the frames for this because on some machines
   the new frame is not set up until the new function executes
   some instructions.  */

#define	SAVED_PC_AFTER_CALL(frame) read_register (LR_REGNUM)

/* Address of end of stack space.  */

#define STACK_END_ADDR 0x2ff80000

/* Stack grows downward.  */

#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))

/* This is how arguments pushed onto stack or passed in registers.
   Stack must be aligned on 64-bit boundaries when synthesizing
   function calls.  We don't need STACK_ALIGN, PUSH_ARGUMENTS will
   handle it. */

#define	PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
  (rs6000_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr)))
extern CORE_ADDR rs6000_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int, CORE_ADDR));

/* BREAKPOINT_FROM_PC uses the program counter value to determine the
   breakpoint that should be used */
extern breakpoint_from_pc_fn rs6000_breakpoint_from_pc;
#define BREAKPOINT_FROM_PC(pcptr, lenptr) rs6000_breakpoint_from_pc (pcptr, lenptr)

/* Amount PC must be decremented by after a breakpoint.
   This is often the number of bytes in BREAKPOINT
   but not always.  */

#define DECR_PC_AFTER_BREAK 0

/* Say how long (ordinary) registers are.  This is a piece of bogosity
   used in push_word and a few other places; REGISTER_RAW_SIZE is the
   real way to know how big a register is.  */
#define REGISTER_SIZE 4


/* Return the name of register number REG.  This may return "" to
   indicate a register number that's not used on this variant.
   (Register numbers may be sparse for consistency between variants.)  */
#define REGISTER_NAME(reg) (rs6000_register_name(reg))
extern char *rs6000_register_name (int reg);

/* Number of machine registers */
#define NUM_REGS 183

/* Register numbers of various important registers.
   Note that some of these values are "real" register numbers,
   and correspond to the general registers of the machine,
   and some are "phony" register numbers which are too large
   to be actual register numbers as far as the user is concerned
   but do serve to get the desired values when passed to read_register.  */

#define FP_REGNUM 1		/* Contains address of executing stack frame */
#define SP_REGNUM 1		/* Contains address of top of stack */
#define	TOC_REGNUM 2		/* TOC register */
#define FP0_REGNUM 32		/* Floating point register 0 */
#define	GP0_REGNUM 0		/* GPR register 0 */
#define FP0_REGNUM 32		/* FPR (Floating point) register 0 */
#define FPLAST_REGNUM 63	/* Last floating point register */

/* Special purpose registers... */
/* P.S. keep these in the same order as in /usr/mstsave.h `mstsave'
   structure, for easier processing */

#define PC_REGNUM 64		/* Program counter (instruction address %iar) */
#define PS_REGNUM 65		/* Processor (or machine) status (%msr) */
#define	CR_REGNUM 66		/* Condition register */
#define	LR_REGNUM 67		/* Link register */
#define	CTR_REGNUM 68		/* Count register */
#define	XER_REGNUM 69		/* Fixed point exception registers */
#define	MQ_REGNUM 70		/* Multiply/quotient register */

/* These #defines are used to parse core files and talk to ptrace, so they
   must remain fixed.  */
#define	FIRST_UISA_SP_REGNUM 64	/* first special register number */
#define LAST_UISA_SP_REGNUM  70	/* last special register number */

/* This is the offset in REG_NAMES at which the `set processor'
   command starts plugging in its names.  */
#define FIRST_VARIANT_REGISTER 66

/* Total amount of space needed to store our copies of the machine's
   register state, the array `registers'.
   32 4-byte gpr's
   32 8-byte fpr's
   7  4-byte UISA special purpose registers, 
   16 4-byte segment registers,
   32 4-byte standard OEA special-purpose registers,
   and up to 64 4-byte non-standard OEA special purpose regs.
   total: (+ (* 32 4) (* 32 8) (* 7 4) (* 16 4) (* 32 4) (* 64 4)) 860 bytes
   Keep some extra space for now, in case to add more. */
#define REGISTER_BYTES 880


/* Index within `registers' of the first byte of the space for
   register N.  */

#define REGISTER_BYTE(N)  \
 (								\
  ((N) > FPLAST_REGNUM) ? ((((N) - FPLAST_REGNUM -1) * 4) + 384)\
  :((N) >= FP0_REGNUM) ? ((((N) - FP0_REGNUM) * 8) + 128)	\
  :((N) * 4) )

/* Number of bytes of storage in the actual machine representation
   for register N. */
/* Note that the unsigned cast here forces the result of the
   subtraction to very high positive values if N < FP0_REGNUM */

#define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 32 ? 8 : 4)

/* Number of bytes of storage in the program's representation
   for register N.  On the RS6000, all regs are 4 bytes
   except the floating point regs which are 8-byte doubles.  */

#define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 32 ? 8 : 4)

/* Largest value REGISTER_RAW_SIZE can have.  */

#define MAX_REGISTER_RAW_SIZE 8

/* Largest value REGISTER_VIRTUAL_SIZE can have.  */

#define MAX_REGISTER_VIRTUAL_SIZE 8

/* convert a dbx stab register number (from `r' declaration) to a gdb REGNUM */

#define STAB_REG_TO_REGNUM(value)	(value)

/* Nonzero if register N requires conversion
   from raw format to virtual format.
   The register format for rs6000 floating point registers is always
   double, we need a conversion if the memory format is float.  */

#define REGISTER_CONVERTIBLE(N) ((N) >= FP0_REGNUM && (N) <= FPLAST_REGNUM)

/* Convert data from raw format for register REGNUM in buffer FROM
   to virtual format with type TYPE in buffer TO.  */