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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [config/] [vax/] [tm-vax.h] - Blame information for rev 106

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1 106 markom
/* Definitions to make GDB run on a vax under 4.2bsd.
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   Copyright 1986, 1987, 1989, 1991, 1993 Free Software Foundation, Inc.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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#define TARGET_BYTE_ORDER LITTLE_ENDIAN
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/* Offset from address of function to start of its code.
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   Zero on most machines.  */
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#define FUNCTION_START_OFFSET 2
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/* Advance PC across any function entry prologue instructions
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   to reach some "real" code.  */
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extern CORE_ADDR vax_skip_prologue PARAMS ((CORE_ADDR));
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#define SKIP_PROLOGUE(pc) (vax_skip_prologue (pc))
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/* Immediately after a function call, return the saved pc.
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   Can't always go through the frames for this because on some machines
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   the new frame is not set up until the new function executes
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   some instructions.  */
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#define SAVED_PC_AFTER_CALL(frame) FRAME_SAVED_PC(frame)
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#define TARGET_UPAGES 14
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#define TARGET_NBPG 512
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#define STACK_END_ADDR (0x80000000 - (TARGET_UPAGES * TARGET_NBPG))
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/* On the VAX, sigtramp is in the u area.  Can't check the exact
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   addresses because for cross-debugging we don't have VAX include
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   files around.  This should be close enough.  */
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#define SIGTRAMP_START(pc)      STACK_END_ADDR
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#define SIGTRAMP_END(pc)        0x80000000
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/* Stack grows downward.  */
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#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
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/* Sequence of bytes for breakpoint instruction.  */
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#define BREAKPOINT {3}
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/* Amount PC must be decremented by after a breakpoint.
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   This is often the number of bytes in BREAKPOINT
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   but not always.  */
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#define DECR_PC_AFTER_BREAK 0
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/* Return 1 if P points to an invalid floating point value.
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   LEN is the length in bytes -- not relevant on the Vax.  */
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#define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
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/* Say how long (ordinary) registers are.  This is a piece of bogosity
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   used in push_word and a few other places; REGISTER_RAW_SIZE is the
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   real way to know how big a register is.  */
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#define REGISTER_SIZE 4
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/* Number of machine registers */
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#define NUM_REGS 17
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/* Initializer for an array of names of registers.
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   There should be NUM_REGS strings in this initializer.  */
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#define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "ap", "fp", "sp", "pc", "ps"}
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/* Register numbers of various important registers.
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   Note that some of these values are "real" register numbers,
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   and correspond to the general registers of the machine,
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   and some are "phony" register numbers which are too large
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   to be actual register numbers as far as the user is concerned
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   but do serve to get the desired values when passed to read_register.  */
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#define AP_REGNUM 12
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#define FP_REGNUM 13            /* Contains address of executing stack frame */
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#define SP_REGNUM 14            /* Contains address of top of stack */
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#define PC_REGNUM 15            /* Contains program counter */
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#define PS_REGNUM 16            /* Contains processor status */
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/* Total amount of space needed to store our copies of the machine's
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   register state, the array `registers'.  */
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#define REGISTER_BYTES (17*4)
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/* Index within `registers' of the first byte of the space for
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   register N.  */
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#define REGISTER_BYTE(N) ((N) * 4)
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/* Number of bytes of storage in the actual machine representation
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   for register N.  On the vax, all regs are 4 bytes.  */
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#define REGISTER_RAW_SIZE(N) 4
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/* Number of bytes of storage in the program's representation
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   for register N.  On the vax, all regs are 4 bytes.  */
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#define REGISTER_VIRTUAL_SIZE(N) 4
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/* Largest value REGISTER_RAW_SIZE can have.  */
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#define MAX_REGISTER_RAW_SIZE 4
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/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
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#define MAX_REGISTER_VIRTUAL_SIZE 4
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/* Return the GDB type object for the "standard" data type
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   of data in register N.  */
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#define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
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/* Store the address of the place in which to copy the structure the
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   subroutine will return.  This is called from call_function. */
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#define STORE_STRUCT_RETURN(ADDR, SP) \
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  { write_register (1, (ADDR)); }
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/* Extract from an array REGBUF containing the (raw) register state
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   a function return value of type TYPE, and copy that, in virtual format,
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   into VALBUF.  */
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141
#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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  memcpy (VALBUF, REGBUF, TYPE_LENGTH (TYPE))
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144
/* Write into appropriate registers a function return value
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   of type TYPE, given in virtual format.  */
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147
#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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  write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
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/* Extract from an array REGBUF containing the (raw) register state
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   the address in which a function should return its structure value,
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   as a CORE_ADDR (or an expression that can be used as one).  */
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#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
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/* Describe the pointer in each stack frame to the previous stack frame
158
   (its caller).  */
159
 
160
/* FRAME_CHAIN takes a frame's nominal address
161
   and produces the frame's chain-pointer. */
162
 
163
/* In the case of the Vax, the frame's nominal address is the FP value,
164
   and 12 bytes later comes the saved previous FP value as a 4-byte word.  */
165
 
166
#define FRAME_CHAIN(thisframe)  \
167
  (!inside_entry_file ((thisframe)->pc) ? \
168
   read_memory_integer ((thisframe)->frame + 12, 4) :\
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   0)
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171
/* Define other aspects of the stack frame.  */
172
 
173
/* A macro that tells us whether the function invocation represented
174
   by FI does not have a frame on the stack associated with it.  If it
175
   does not, FRAMELESS is set to 1, else 0.  */
176
/* On the vax, all functions have frames.  */
177
#define FRAMELESS_FUNCTION_INVOCATION(FI)  (0)
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179
/* Saved Pc.  Get it from sigcontext if within sigtramp.  */
180
 
181
/* Offset to saved PC in sigcontext, from <sys/signal.h>.  */
182
#define SIGCONTEXT_PC_OFFSET 12
183
 
184
#define FRAME_SAVED_PC(FRAME) \
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  (((FRAME)->signal_handler_caller \
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    ? sigtramp_saved_pc (FRAME) \
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    : read_memory_integer ((FRAME)->frame + 16, 4)) \
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   )
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/* Cannot find the AP register value directly from the FP value.  Must
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   find it saved in the frame called by this one, or in the AP
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   register for the innermost frame.  However, there is no way to tell
193
   the difference between the innermost frame and a frame for which we
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   just don't know the frame that it called (e.g. "info frame
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   0x7ffec789").  For the sake of argument suppose that the stack is
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   somewhat trashed (which is one reason that "info frame" exists).
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   So return 0 (indicating we don't know the address of
198
   the arglist) if we don't know what frame this frame calls.  */
199
#define FRAME_ARGS_ADDRESS_CORRECT(fi) \
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 (((fi)->next                                  \
201
   ? read_memory_integer ((fi)->next->frame + 8, 4)   \
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   : /* read_register (AP_REGNUM) */ 0))
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/* In most of GDB, getting the args address is too important to
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   just say "I don't know".  This is sometimes wrong for functions
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   that aren't on top of the stack, but c'est la vie.  */
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#define FRAME_ARGS_ADDRESS(fi) \
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 (((fi)->next                                  \
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   ? read_memory_integer ((fi)->next->frame + 8, 4)   \
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   : read_register (AP_REGNUM) /* 0 */))
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212
#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
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/* Return number of args passed to a frame.
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   Can return -1, meaning no way to tell.  */
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217
extern int vax_frame_num_args PARAMS ((struct frame_info * fi));
218
#define FRAME_NUM_ARGS(fi) (vax_frame_num_args ((fi)))
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220
/* Return number of bytes at start of arglist that are not really args.  */
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222
#define FRAME_ARGS_SKIP 4
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224
/* Put here the code to store, into a struct frame_saved_regs,
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   the addresses of the saved registers of frame described by FRAME_INFO.
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   This includes special registers such as pc and fp saved in special
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   ways in the stack frame.  sp is even more special:
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   the address we return for it IS the sp for the next frame.  */
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#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
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{ register int regnum;     \
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  register int regmask = read_memory_integer ((frame_info)->frame+4, 4) >> 16; \
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  register CORE_ADDR next_addr;     \
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  memset (&frame_saved_regs, '\0', sizeof frame_saved_regs);     \
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  next_addr = (frame_info)->frame + 16;     \
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  /* Regmask's low bit is for register 0,     \
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     which is the first one that would be pushed.  */     \
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  for (regnum = 0; regnum < 12; regnum++, regmask >>= 1)  \
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    (frame_saved_regs).regs[regnum] = (regmask & 1) ? (next_addr += 4) : 0;  \
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  (frame_saved_regs).regs[SP_REGNUM] = next_addr + 4;  \
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  if (read_memory_integer ((frame_info)->frame + 4, 4) & 0x20000000)   \
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    (frame_saved_regs).regs[SP_REGNUM] += 4 + 4 * read_memory_integer (next_addr + 4, 4);  \
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  (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 16;  \
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  (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 12;  \
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  (frame_saved_regs).regs[AP_REGNUM] = (frame_info)->frame + 8;  \
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  (frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4;  \
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}
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/* Things needed for making the inferior call functions.  */
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251
/* Push an empty stack frame, to record the current PC, etc.  */
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253
#define PUSH_DUMMY_FRAME \
254
{ register CORE_ADDR sp = read_register (SP_REGNUM);\
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  register int regnum;                              \
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  sp = push_word (sp, 0); /* arglist */              \
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  for (regnum = 11; regnum >= 0; regnum--)           \
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    sp = push_word (sp, read_register (regnum));    \
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  sp = push_word (sp, read_register (PC_REGNUM));   \
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  sp = push_word (sp, read_register (FP_REGNUM));   \
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  sp = push_word (sp, read_register (AP_REGNUM));   \
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  sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef)   \
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                      + 0x2fff0000);                \
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  sp = push_word (sp, 0);                            \
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  write_register (SP_REGNUM, sp);                   \
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  write_register (FP_REGNUM, sp);                   \
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  write_register (AP_REGNUM, sp + 17 * sizeof (int)); }
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/* Discard from the stack the innermost frame, restoring all registers.  */
270
 
271
#define POP_FRAME  \
272
{ register CORE_ADDR fp = read_register (FP_REGNUM);             \
273
  register int regnum;                                           \
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  register int regmask = read_memory_integer (fp + 4, 4);        \
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  write_register (PS_REGNUM,                                     \
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                  (regmask & 0xffff)                             \
277
                  | (read_register (PS_REGNUM) & 0xffff0000));   \
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  write_register (PC_REGNUM, read_memory_integer (fp + 16, 4));  \
279
  write_register (FP_REGNUM, read_memory_integer (fp + 12, 4));  \
280
  write_register (AP_REGNUM, read_memory_integer (fp + 8, 4));   \
281
  fp += 16;                                                      \
282
  for (regnum = 0; regnum < 12; regnum++)                         \
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    if (regmask & (0x10000 << regnum))                           \
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      write_register (regnum, read_memory_integer (fp += 4, 4)); \
285
  fp = fp + 4 + ((regmask >> 30) & 3);                           \
286
  if (regmask & 0x20000000)                                      \
287
    { regnum = read_memory_integer (fp, 4);                      \
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      fp += (regnum + 1) * 4; }                                  \
289
  write_register (SP_REGNUM, fp);                                \
290
  flush_cached_frames ();                                        \
291
}
292
 
293
/* This sequence of words is the instructions
294
   calls #69, @#32323232
295
   bpt
296
   Note this is 8 bytes.  */
297
 
298
#define CALL_DUMMY {0x329f69fb, 0x03323232}
299
 
300
#define CALL_DUMMY_START_OFFSET 0       /* Start execution at beginning of dummy */
301
 
302
#define CALL_DUMMY_BREAKPOINT_OFFSET 7
303
 
304
/* Insert the specified number of args and function address
305
   into a call sequence of the above form stored at DUMMYNAME.  */
306
 
307
#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
308
{ *((char *) dummyname + 1) = nargs;            \
309
  *(int *)((char *) dummyname + 3) = fun; }
310
 
311
/* If vax pcc says CHAR or SHORT, it provides the correct address.  */
312
 
313
#define BELIEVE_PCC_PROMOTION 1

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