406 lines
14 KiB
C
406 lines
14 KiB
C
/* Definitions to make GDB run on an encore under umax 4.2
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Copyright (C) 1987, 1989 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#define TARGET_BYTE_ORDER LITTLE_ENDIAN
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/* Define this if the C compiler puts an underscore at the front
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of external names before giving them to the linker. */
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#define NAMES_HAVE_UNDERSCORE
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/* Exec files and symbol tables are in COFF format */
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#define COFF_FORMAT
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/* Need to get function ends by adding this to epilogue address from .bf
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record, not using x_fsize field. */
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#define FUNCTION_EPILOGUE_SIZE 4
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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 0
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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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#define SKIP_PROLOGUE(pc) \
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{ register unsigned char op = read_memory_integer (pc, 1); \
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if (op == 0x82) { op = read_memory_integer (pc+2,1); \
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if ((op & 0x80) == 0) pc += 3; \
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else if ((op & 0xc0) == 0x80) pc += 4; \
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else pc += 6; \
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} \
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}
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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) \
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read_memory_integer (read_register (SP_REGNUM), 4)
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/* Address of end of stack space. */
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#define STACK_END_ADDR (0xfffff000)
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/* Stack grows downward. */
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#define INNER_THAN <
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/* Sequence of bytes for breakpoint instruction. */
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#define BREAKPOINT {0xf2}
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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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/* Nonzero if instruction at PC is a return instruction. */
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#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0x12)
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#ifndef NaN
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#include <nan.h>
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#endif NaN
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/* Return 1 if P points to an invalid floating point value. */
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/* Surely wrong for cross-debugging. */
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#define INVALID_FLOAT(p, s) \
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((s == sizeof (float))? \
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NaF (*(float *) p) : \
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NaD (*(double *) p))
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/* Say how long (ordinary) registers are. */
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#define REGISTER_TYPE long
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/* Number of machine registers */
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#define NUM_REGS 25
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#define NUM_GENERAL_REGS 8
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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", \
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
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"sp", "fp", "pc", "ps", \
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"fsr", \
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"l0", "l1", "l2", "l3", "xx", \
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}
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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 FP0_REGNUM 8 /* Floating point register 0 */
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#define SP_REGNUM 16 /* Contains address of top of stack */
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#define AP_REGNUM FP_REGNUM
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#define FP_REGNUM 17 /* Contains address of executing stack frame */
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#define PC_REGNUM 18 /* Contains program counter */
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#define PS_REGNUM 19 /* Contains processor status */
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#define FPS_REGNUM 20 /* Floating point status register */
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#define LP0_REGNUM 21 /* Double register 0 (same as FP0) */
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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 ((NUM_REGS - 4) * sizeof (int) + 4 * sizeof (double))
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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) >= LP0_REGNUM ? \
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LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (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 32000, all regs are 4 bytes
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except for the doubled floating registers. */
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#define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
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/* Number of bytes of storage in the program's representation
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for register N. On the 32000, all regs are 4 bytes
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except for the doubled floating registers. */
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#define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
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/* Largest value REGISTER_RAW_SIZE can have. */
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#define MAX_REGISTER_RAW_SIZE 8
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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE 8
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/* Nonzero if register N requires conversion
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from raw format to virtual format. */
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#define REGISTER_CONVERTIBLE(N) 0
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/* Convert data from raw format for register REGNUM
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to virtual format for register REGNUM. */
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#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
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bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
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/* Convert data from virtual format for register REGNUM
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to raw format for register REGNUM. */
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#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
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bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM));
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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) \
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(((N) < FP0_REGNUM) ? \
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builtin_type_int : \
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((N) < FP0_REGNUM + 8) ? \
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builtin_type_float : \
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((N) < LP0_REGNUM) ? \
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builtin_type_int : \
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builtin_type_double)
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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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On this machine this is a no-op, because gcc isn't used on it
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yet. So this calling convention is not used. */
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#define STORE_STRUCT_RETURN(ADDR, SP)
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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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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE))
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/* Write into appropriate registers a function return value
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of type TYPE, given in virtual format. */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 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
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(its caller). */
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/* FRAME_CHAIN takes a frame's nominal address
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and produces the frame's chain-pointer.
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FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
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and produces the nominal address of the caller frame.
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However, if FRAME_CHAIN_VALID returns zero,
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it means the given frame is the outermost one and has no caller.
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In that case, FRAME_CHAIN_COMBINE is not used. */
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/* In the case of the ns32000 series, the frame's nominal address is the FP
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value, and at that address is saved previous FP value as a 4-byte word. */
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#define FRAME_CHAIN(thisframe) \
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(outside_startup_file ((thisframe)->pc) ? \
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read_memory_integer ((thisframe)->frame, 4) :\
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0)
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#define FRAME_CHAIN_VALID(chain, thisframe) \
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(chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
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#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
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/* Define other aspects of the stack frame. */
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#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
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/* Compute base of arguments. */
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#define FRAME_ARGS_ADDRESS(fi) \
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((ns32k_get_enter_addr ((fi)->pc) > 1) ? \
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((fi)->frame) : (read_register (SP_REGNUM) - 4))
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#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
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/* Get the address of the enter opcode for this function, if it is active.
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Returns positive address > 1 if pc is between enter/exit,
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1 if pc before enter or after exit, 0 otherwise. */
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#ifndef CORE_ADDR
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#include "defs.h" /* Make sure CORE_ADDR is defined. */
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#endif
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extern CORE_ADDR ns32k_get_enter_addr ();
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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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Encore's C compiler often reuses same area on stack for args,
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so this will often not work properly. If the arg names
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are known, it's likely most of them will be printed. */
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#define FRAME_NUM_ARGS(numargs, fi) \
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{ CORE_ADDR pc; \
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CORE_ADDR enter_addr; \
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unsigned int insn; \
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unsigned int addr_mode; \
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int width; \
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\
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numargs = -1; \
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enter_addr = ns32k_get_enter_addr ((fi)->pc); \
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if (enter_addr > 0) \
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{ \
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pc = (enter_addr == 1) ? \
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SAVED_PC_AFTER_CALL (fi) : \
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FRAME_SAVED_PC (fi); \
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insn = read_memory_integer (pc,2); \
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addr_mode = (insn >> 11) & 0x1f; \
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insn = insn & 0x7ff; \
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if ((insn & 0x7fc) == 0x57c && \
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addr_mode == 0x14) /* immediate */ \
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{ \
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if (insn == 0x57c) /* adjspb */ \
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width = 1; \
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else if (insn == 0x57d) /* adjspw */ \
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width = 2; \
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else if (insn == 0x57f) /* adjspd */ \
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width = 4; \
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numargs = read_memory_integer (pc+2,width); \
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if (width > 1) \
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flip_bytes (&numargs, width); \
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numargs = - sign_extend (numargs, width*8) / 4;\
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} \
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} \
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}
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/* Return number of bytes at start of arglist that are not really args. */
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#define FRAME_ARGS_SKIP 8
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/* 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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{ \
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register int regmask, regnum; \
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int localcount; \
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register CORE_ADDR enter_addr; \
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register CORE_ADDR next_addr; \
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\
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bzero (&(frame_saved_regs), sizeof (frame_saved_regs)); \
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enter_addr = ns32k_get_enter_addr ((frame_info)->pc); \
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if (enter_addr > 1) \
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{ \
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regmask = read_memory_integer (enter_addr+1, 1) & 0xff; \
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localcount = ns32k_localcount (enter_addr); \
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next_addr = (frame_info)->frame + localcount; \
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for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) \
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(frame_saved_regs).regs[regnum] = (regmask & 1) ? \
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(next_addr -= 4) : 0; \
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(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\
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(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\
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(frame_saved_regs).regs[FP_REGNUM] = \
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(read_memory_integer ((frame_info)->frame, 4));\
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} \
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else if (enter_addr == 1) \
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{ \
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CORE_ADDR sp = read_register (SP_REGNUM); \
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(frame_saved_regs).regs[PC_REGNUM] = sp; \
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(frame_saved_regs).regs[SP_REGNUM] = sp + 4; \
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} \
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}
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/* Things needed for making the inferior call functions. */
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/* Push an empty stack frame, to record the current PC, etc. */
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#define PUSH_DUMMY_FRAME \
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{ register CORE_ADDR sp = read_register (SP_REGNUM);\
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register int 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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write_register (FP_REGNUM, sp); \
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for (regnum = 0; regnum < 8; regnum++) \
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sp = push_word (sp, read_register (regnum)); \
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write_register (SP_REGNUM, sp); \
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}
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/* Discard from the stack the innermost frame, restoring all registers. */
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#define POP_FRAME \
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{ register FRAME frame = get_current_frame (); \
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register CORE_ADDR fp; \
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register int regnum; \
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struct frame_saved_regs fsr; \
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struct frame_info *fi; \
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fi = get_frame_info (frame); \
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fp = fi->frame; \
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get_frame_saved_regs (fi, &fsr); \
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for (regnum = 0; regnum < 8; regnum++) \
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if (fsr.regs[regnum]) \
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write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
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write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
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write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
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write_register (SP_REGNUM, fp + 8); \
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flush_cached_frames (); \
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set_current_frame (create_new_frame (read_register (FP_REGNUM),\
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read_pc ())); }
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/* This sequence of words is the instructions
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enter 0xff,0 82 ff 00
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jsr @0x00010203 7f ae c0 01 02 03
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adjspd 0x69696969 7f a5 01 02 03 04
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bpt f2
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Note this is 16 bytes. */
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#define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
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#define CALL_DUMMY_START_OFFSET 3
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#define CALL_DUMMY_LENGTH 16
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#define CALL_DUMMY_ADDR 5
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#define CALL_DUMMY_NARGS 11
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/* Insert the specified number of args and function address
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into a call sequence of the above form stored at DUMMYNAME. */
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#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
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{ \
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int flipped; \
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flipped = fun | 0xc0000000; \
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flip_bytes (&flipped, 4); \
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*((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \
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flipped = - nargs * 4; \
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flip_bytes (&flipped, 4); \
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*((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \
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}
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