288 lines
9.9 KiB
C
288 lines
9.9 KiB
C
/* Parameters for execution on a z8000 series machine.
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Copyright 1992, 1993, 1994, 1998, 1999, 2000, 2001
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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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#undef TARGET_INT_BIT
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#undef TARGET_LONG_BIT
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#undef TARGET_SHORT_BIT
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#undef TARGET_PTR_BIT
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#define TARGET_SHORT_BIT 16
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#define TARGET_INT_BIT 16
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#define TARGET_LONG_BIT 32
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#define TARGET_PTR_BIT (BIG ? 32: 16)
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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(ip) (z8k_skip_prologue (ip))
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extern CORE_ADDR z8k_skip_prologue (CORE_ADDR ip);
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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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extern int z8k_saved_pc_after_call (struct frame_info *frame);
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#define SAVED_PC_AFTER_CALL(frame) z8k_saved_pc_after_call(frame)
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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 {0x36,0x00}
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/* If your kernel resets the pc after the trap happens you may need to
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define this before including this file. */
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#define DECR_PC_AFTER_BREAK 0
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/* Say how long registers are. */
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#define REGISTER_TYPE unsigned int
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#define NUM_REGS 23 /* 16 registers + 1 ccr + 1 pc + 3 debug
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regs + fake fp + fake sp */
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#define REGISTER_BYTES (NUM_REGS *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 z8k, all but the pc are 2 bytes, but we
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keep them all as 4 bytes and trim them on I/O */
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#define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
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/* Number of bytes of storage in the program's representation
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for register N. */
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#define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
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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) \
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(REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
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/*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y) */
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/* Initializer for an array of names of registers.
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Entries beyond the first NUM_REGS are ignored. */
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#define REGISTER_NAMES \
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{"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
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"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
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"ccr", "pc", "cycles","insts","time","fp","sp"}
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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 CCR_REGNUM 16 /* Contains processor status */
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#define PC_REGNUM 17 /* Contains program counter */
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#define CYCLES_REGNUM 18
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#define INSTS_REGNUM 19
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#define TIME_REGNUM 20
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#define FP_REGNUM 21 /* Contains fp, whatever memory model */
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#define SP_REGNUM 22 /* Conatins sp, whatever memory model */
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#define PTR_SIZE (BIG ? 4: 2)
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#define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
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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) internal_error (__FILE__, __LINE__, "failed internal consistency check");
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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. This is assuming that floating point values are returned
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as doubles in d0/d1. */
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), 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) internal_error (__FILE__, __LINE__, "failed internal consistency check");
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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) (*(CORE_ADDR *)(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 and produces the frame's
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chain-pointer.
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In the case of the Z8000, the frame's nominal address
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is the address of a ptr sized byte word containing the calling
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frame's address. */
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extern CORE_ADDR z8k_frame_chain (struct frame_info *thisframe);
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#define FRAME_CHAIN(thisframe) z8k_frame_chain(thisframe);
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/* Define other aspects of the stack frame. */
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/* A macro that tells us whether the function invocation represented
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by FI does not have a frame on the stack associated with it. If it
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does not, FRAMELESS is set to 1, else 0. */
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#define FRAMELESS_FUNCTION_INVOCATION(FI) \
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(frameless_look_for_prologue (FI))
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extern CORE_ADDR z8k_frame_saved_pc (struct frame_info *frame);
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#define FRAME_SAVED_PC(FRAME) z8k_frame_saved_pc(FRAME)
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#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
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#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
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/* Set VAL to the number of args passed to frame described by FI.
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Can set VAL to -1, meaning no way to tell. */
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/* We can't tell how many args there are
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now that the C compiler delays popping them. */
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#if !defined (FRAME_NUM_ARGS)
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#define FRAME_NUM_ARGS(fi) (-1)
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#endif
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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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struct frame_info;
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extern void z8k_frame_init_saved_regs (struct frame_info *);
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#define FRAME_INIT_SAVED_REGS(fi) z8k_frame_init_saved_regs (fi)
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/* Things needed for making the inferior call functions.
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It seems like every m68k based machine has almost identical definitions
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in the individual machine's configuration files. Most other cpu types
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(mips, i386, etc) have routines in their *-tdep.c files to handle this
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for most configurations. The m68k family should be able to do this as
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well. These macros can still be overridden when necessary. */
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/* The CALL_DUMMY macro is the sequence of instructions, as disassembled
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by gdb itself:
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fmovemx fp0-fp7,sp@- 0xf227 0xe0ff
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moveml d0-a5,sp@- 0x48e7 0xfffc
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clrw sp@- 0x4267
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movew ccr,sp@- 0x42e7
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/..* The arguments are pushed at this point by GDB;
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no code is needed in the dummy for this.
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The CALL_DUMMY_START_OFFSET gives the position of
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the following jsr instruction. *../
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jsr @#0x32323232 0x4eb9 0x3232 0x3232
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addal #0x69696969,sp 0xdffc 0x6969 0x6969
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trap #<your BPT_VECTOR number here> 0x4e4?
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nop 0x4e71
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Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
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We actually start executing at the jsr, since the pushing of the
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registers is done by PUSH_DUMMY_FRAME. If this were real code,
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the arguments for the function called by the jsr would be pushed
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between the moveml and the jsr, and we could allow it to execute through.
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But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is
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done, and we cannot allow the moveml to push the registers again lest
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they be taken for the arguments. */
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#define CALL_DUMMY { 0 }
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#define CALL_DUMMY_LENGTH 24 /* Size of CALL_DUMMY */
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#define CALL_DUMMY_START_OFFSET 8 /* Offset to jsr instruction */
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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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We use the BFD routines to store a big-endian value of known size. */
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#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
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{ bfd_putb32 (fun, (char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \
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bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
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/* Push an empty stack frame, to record the current PC, etc. */
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#define PUSH_DUMMY_FRAME { z8k_push_dummy_frame (); }
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extern void z8k_push_dummy_frame (void);
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extern void z8k_pop_frame (void);
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/* Discard from the stack the innermost frame, restoring all registers. */
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#define POP_FRAME { z8k_pop_frame (); }
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/* Offset from SP to first arg on stack at first instruction of a function */
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#define SP_ARG0 (1 * 4)
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extern CORE_ADDR z8k_addr_bits_remove (CORE_ADDR);
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#define ADDR_BITS_REMOVE(addr) z8k_addr_bits_remove (addr)
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int sim_z8001_mode;
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#define BIG (sim_z8001_mode)
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#define read_memory_short(x) (read_memory_integer(x,2) & 0xffff)
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#define NO_STD_REGS
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extern void z8k_print_register_hook (int regno);
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#define PRINT_REGISTER_HOOK(regno) z8k_print_register_hook(regno)
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extern void z8k_set_pointer_size (int newsize);
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#define INIT_EXTRA_SYMTAB_INFO \
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z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);
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#define REGISTER_SIZE 4
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