tm-rs6000.h

arm-linux-gcc编译器

#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
{ \
  if (TYPE_LENGTH (TYPE) != REGISTER_RAW_SIZE (REGNUM)) \
    { \
      double val = extract_floating ((FROM), REGISTER_RAW_SIZE (REGNUM)); \
      store_floating ((TO), TYPE_LENGTH (TYPE), val); \
    } \
  else \
    memcpy ((TO), (FROM), REGISTER_RAW_SIZE (REGNUM)); \
}

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

#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO)	\
{ \
  if (TYPE_LENGTH (TYPE) != REGISTER_RAW_SIZE (REGNUM)) \
    { \
      double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
      store_floating ((TO), REGISTER_RAW_SIZE (REGNUM), val); \
    } \
  else \
    memcpy ((TO), (FROM), REGISTER_RAW_SIZE (REGNUM)); \
}

/* Return the GDB type object for the "standard" data type
   of data in register N.  */

#define REGISTER_VIRTUAL_TYPE(N) \
 (((unsigned)(N) - FP0_REGNUM) < 32 ? builtin_type_double : builtin_type_int)

/* Store the address of the place in which to copy the structure the
   subroutine will return.  This is called from call_function. */
/* in RS6000, struct return addresses are passed as an extra parameter in r3.
   In function return, callee is not responsible of returning this address back.
   Since gdb needs to find it, we will store in a designated variable
   `rs6000_struct_return_address'. */

extern CORE_ADDR rs6000_struct_return_address;

#define STORE_STRUCT_RETURN(ADDR, SP)	\
  { write_register (3, (ADDR));		\
    rs6000_struct_return_address = (ADDR); }

/* Extract from an array REGBUF containing the (raw) register state
   a function return value of type TYPE, and copy that, in virtual format,
   into VALBUF.  */

/* #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
   memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE)) */

#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
  extract_return_value(TYPE,REGBUF,VALBUF)
extern void extract_return_value PARAMS ((struct type *, char[], char *));

/* Write into appropriate registers a function return value
   of type TYPE, given in virtual format.  */

#define STORE_RETURN_VALUE(TYPE,VALBUF) \
  {									\
    if (TYPE_CODE (TYPE) == TYPE_CODE_FLT)				\
									\
     /* Floating point values are returned starting from FPR1 and up.	\
	Say a double_double_double type could be returned in		\
	FPR1/FPR2/FPR3 triple. */					\
									\
      write_register_bytes (REGISTER_BYTE (FP0_REGNUM+1), (VALBUF),	\
						TYPE_LENGTH (TYPE));	\
    else								\
      /* Everything else is returned in GPR3 and up. */			\
      write_register_bytes (REGISTER_BYTE (GP0_REGNUM+3), (VALBUF),	\
						TYPE_LENGTH (TYPE));	\
  }


/* Extract from an array REGBUF containing the (raw) register state
   the address in which a function should return its structure value,
   as a CORE_ADDR (or an expression that can be used as one).  */

#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF)	rs6000_struct_return_address

/* Describe the pointer in each stack frame to the previous stack frame
   (its caller).  */

/* FRAME_CHAIN takes a frame's nominal address
   and produces the frame's chain-pointer. */

/* In the case of the RS6000, the frame's nominal address
   is the address of a 4-byte word containing the calling frame's address.  */

#define FRAME_CHAIN(thisframe) rs6000_frame_chain (thisframe)
CORE_ADDR rs6000_frame_chain PARAMS ((struct frame_info *));

/* Define other aspects of the stack frame.  */

/* A macro that tells us whether the function invocation represented
   by FI does not have a frame on the stack associated with it.  If it
   does not, FRAMELESS is set to 1, else 0.  */

extern int rs6000_frameless_function_invocation (struct frame_info *);
#define FRAMELESS_FUNCTION_INVOCATION(FI) \
  (rs6000_frameless_function_invocation (FI))

#define INIT_FRAME_PC_FIRST(fromleaf, prev) \
  prev->pc = (fromleaf ? SAVED_PC_AFTER_CALL (prev->next) : \
	      prev->next ? FRAME_SAVED_PC (prev->next) : read_pc ());
#define INIT_FRAME_PC(fromleaf, prev)	/* nothing */
extern void rs6000_init_extra_frame_info (int fromleaf, struct frame_info *);
#define	INIT_EXTRA_FRAME_INFO(fromleaf, fi) rs6000_init_extra_frame_info (fromleaf, fi)

/* If the kernel has to deliver a signal, it pushes a sigcontext
   structure on the stack and then calls the signal handler, passing
   the address of the sigcontext in an argument register. Usually
   the signal handler doesn't save this register, so we have to
   access the sigcontext structure via an offset from the signal handler
   frame.
   The following constants were determined by experimentation on AIX 3.2.  */
#define SIG_FRAME_PC_OFFSET 96
#define SIG_FRAME_LR_OFFSET 108
#define SIG_FRAME_FP_OFFSET 284

/* Default offset from SP where the LR is stored */
#define	DEFAULT_LR_SAVE 8

/* Return saved PC from a frame */
#define FRAME_SAVED_PC(FRAME)  rs6000_frame_saved_pc (FRAME)

extern unsigned long rs6000_frame_saved_pc (struct frame_info *);

extern CORE_ADDR rs6000_frame_args_address PARAMS ((struct frame_info *));
#define FRAME_ARGS_ADDRESS(FI) rs6000_frame_args_address (FI)

#define FRAME_LOCALS_ADDRESS(FI)	FRAME_ARGS_ADDRESS(FI)


/* Set VAL to the number of args passed to frame described by FI.
   Can set VAL to -1, meaning no way to tell.  */

/* We can't tell how many args there are
   now that the C compiler delays popping them.  */

#define FRAME_NUM_ARGS(fi) (-1)

/* Return number of bytes at start of arglist that are not really args.  */

#define FRAME_ARGS_SKIP 8	/* Not sure on this. FIXMEmgo */

/* Put here the code to store, into a struct frame_saved_regs,
   the addresses of the saved registers of frame described by FRAME_INFO.
   This includes special registers such as pc and fp saved in special
   ways in the stack frame.  sp is even more special:
   the address we return for it IS the sp for the next frame.  */
/* In the following implementation for RS6000, we did *not* save sp. I am
   not sure if it will be needed. The following macro takes care of gpr's
   and fpr's only. */

extern void rs6000_frame_init_saved_regs PARAMS ((struct frame_info *));
#define FRAME_INIT_SAVED_REGS(FI) rs6000_frame_init_saved_regs (FI)

/* Things needed for making the inferior call functions.  */

/* Push an empty stack frame, to record the current PC, etc.  */
/* Change these names into rs6k_{push, pop}_frame(). FIXMEmgo. */

#define PUSH_DUMMY_FRAME	push_dummy_frame ()
extern void push_dummy_frame PARAMS ((void));

/* Discard from the stack the innermost frame, 
   restoring all saved registers.  */

#define POP_FRAME	pop_frame ()
extern void pop_frame PARAMS ((void));

/* This sequence of words is the instructions:

   mflr r0              // 0x7c0802a6
   // save fpr's
   stfd r?, num(r1)     // 0xd8010000 there should be 32 of this??
   // save gpr's
   stm  r0, num(r1)     // 0xbc010000
   stu  r1, num(r1)     // 0x94210000

   // the function we want to branch might be in a different load 
   // segment. reset the toc register. Note that the actual toc address
   // will be fix by fix_call_dummy () along with function address.

   st   r2, 0x14(r1)    // 0x90410014 save toc register
   liu  r2, 0x1234      // 0x3c401234 reset a new toc value 0x12345678
   oril r2, r2,0x5678   // 0x60425678   

   // load absolute address 0x12345678 to r0
   liu  r0, 0x1234      // 0x3c001234
   oril r0, r0,0x5678   // 0x60005678
   mtctr        r0              // 0x7c0903a6 ctr <- r0
   bctrl                        // 0x4e800421 jump subroutine 0x12345678 (%ctr)
   cror 0xf, 0xf, 0xf   // 0x4def7b82
   brpt                 // 0x7d821008, breakpoint
   cror 0xf, 0xf, 0xf   // 0x4def7b82 (for 8 byte alignment)


   We actually start executing by saving the toc register first, since the pushing 
   of the registers is done by PUSH_DUMMY_FRAME.  If this were real code,
   the arguments for the function called by the `bctrl' would be pushed
   between the `stu' and the `bctrl', and we could allow it to execute through.
   But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
   and we cannot allow to push the registers again.
 */

#define CALL_DUMMY {0x7c0802a6, 0xd8010000, 0xbc010000, 0x94210000, \
		    0x90410014, 0x3c401234, 0x60425678,		    \
		    0x3c001234, 0x60005678, 0x7c0903a6, 0x4e800421, \
		    0x4def7b82, 0x7d821008, 0x4def7b82 }


/* keep this as multiple of 8 (%sp requires 8 byte alignment) */
#define CALL_DUMMY_LENGTH 56

#define CALL_DUMMY_START_OFFSET 16

/* Insert the specified number of args and function address into a
   call sequence of the above form stored at DUMMYNAME.  */

#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
  rs6000_fix_call_dummy (dummyname, pc, fun, nargs, args, type, gcc_p)
extern void rs6000_fix_call_dummy PARAMS ((char *, CORE_ADDR, CORE_ADDR,
					   int, struct value **,
					   struct type *, int));

/* Hook in rs6000-tdep.c for determining the TOC address when
   calling functions in the inferior.  */
extern
CORE_ADDR (*find_toc_address_hook) PARAMS ((CORE_ADDR));

/* xcoffread.c provides a function to determine the TOC offset
   for a given object file.
   It is used under native AIX configurations for determining the
   TOC address when calling functions in the inferior.  */

struct objfile;
extern CORE_ADDR get_toc_offset PARAMS ((struct objfile *));

/* Usually a function pointer's representation is simply the address
   of the function. On the RS/6000 however, a function pointer is
   represented by a pointer to a TOC entry. This TOC entry contains
   three words, the first word is the address of the function, the
   second word is the TOC pointer (r2), and the third word is the
   static chain value.  Throughout GDB it is currently assumed that a
   function pointer contains the address of the function, which is not
   easy to fix.  In addition, the conversion of a function address to
   a function pointer would require allocation of a TOC entry in the
   inferior's memory space, with all its drawbacks.  To be able to
   call C++ virtual methods in the inferior (which are called via
   function pointers), find_function_addr uses this macro to get the
   function address from a function pointer.  */

#define CONVERT_FROM_FUNC_PTR_ADDR(ADDR) \
  (is_magic_function_pointer (ADDR) ? read_memory_integer (ADDR, 4) : (ADDR))
     extern int is_magic_function_pointer PARAMS ((CORE_ADDR));

/* Flag for machine-specific stuff in shared files.  FIXME */
#define IBM6000_TARGET

/* RS6000/AIX does not support PT_STEP.  Has to be simulated.  */

#define SOFTWARE_SINGLE_STEP_P 1
     extern void rs6000_software_single_step PARAMS ((unsigned int, int));
#define SOFTWARE_SINGLE_STEP(sig,bp_p) rs6000_software_single_step (sig, bp_p)

/* If the current gcc for for this target does not produce correct debugging
   information for float parameters, both prototyped and unprototyped, then
   define this macro.  This forces gdb to  always assume that floats are
   passed as doubles and then converted in the callee.

   For the PowerPC, it appears that the debug info marks the parameters as
   floats regardless of whether the function is prototyped, but the actual
   values are always passed in as doubles.  Thus by setting this to 1, both
   types of calls will work. */

#define COERCE_FLOAT_TO_DOUBLE(formal, actual) (1)