288 lines
9.9 KiB
C
288 lines
9.9 KiB
C
/* Parameters for execution on a z8000 series machine.
|
||
Copyright 1992, 1993, 1994, 1998, 1999, 2000, 2001
|
||
Free Software Foundation, Inc.
|
||
|
||
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. */
|
||
|
||
#undef TARGET_INT_BIT
|
||
#undef TARGET_LONG_BIT
|
||
#undef TARGET_SHORT_BIT
|
||
#undef TARGET_PTR_BIT
|
||
|
||
#define TARGET_SHORT_BIT 16
|
||
#define TARGET_INT_BIT 16
|
||
#define TARGET_LONG_BIT 32
|
||
#define TARGET_PTR_BIT (BIG ? 32: 16)
|
||
|
||
/* 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. */
|
||
|
||
#define SKIP_PROLOGUE(ip) (z8k_skip_prologue (ip))
|
||
extern CORE_ADDR z8k_skip_prologue (CORE_ADDR ip);
|
||
|
||
|
||
/* Immediately after a function call, return the saved pc.
|
||
Can't always go through the frames for this because on some machines
|
||
the new frame is not set up until the new function executes
|
||
some instructions. */
|
||
|
||
|
||
extern int z8k_saved_pc_after_call (struct frame_info *frame);
|
||
#define SAVED_PC_AFTER_CALL(frame) z8k_saved_pc_after_call(frame)
|
||
|
||
/* Stack grows downward. */
|
||
|
||
#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
|
||
|
||
/* Sequence of bytes for breakpoint instruction. */
|
||
|
||
#define BREAKPOINT {0x36,0x00}
|
||
|
||
/* If your kernel resets the pc after the trap happens you may need to
|
||
define this before including this file. */
|
||
|
||
#define DECR_PC_AFTER_BREAK 0
|
||
|
||
/* Say how long registers are. */
|
||
|
||
#define REGISTER_TYPE unsigned int
|
||
|
||
#define NUM_REGS 23 /* 16 registers + 1 ccr + 1 pc + 3 debug
|
||
regs + fake fp + fake sp */
|
||
#define REGISTER_BYTES (NUM_REGS *4)
|
||
|
||
/* Index within `registers' of the first byte of the space for
|
||
register N. */
|
||
|
||
#define REGISTER_BYTE(N) ((N)*4)
|
||
|
||
/* Number of bytes of storage in the actual machine representation
|
||
for register N. On the z8k, all but the pc are 2 bytes, but we
|
||
keep them all as 4 bytes and trim them on I/O */
|
||
|
||
|
||
#define REGISTER_RAW_SIZE(N) (((N) < 16)? 2:4)
|
||
|
||
/* Number of bytes of storage in the program's representation
|
||
for register N. */
|
||
|
||
#define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
|
||
|
||
/* Largest value REGISTER_RAW_SIZE can have. */
|
||
|
||
#define MAX_REGISTER_RAW_SIZE 4
|
||
|
||
/* Largest value REGISTER_VIRTUAL_SIZE can have. */
|
||
|
||
#define MAX_REGISTER_VIRTUAL_SIZE 4
|
||
|
||
/* Return the GDB type object for the "standard" data type
|
||
of data in register N. */
|
||
|
||
#define REGISTER_VIRTUAL_TYPE(N) \
|
||
(REGISTER_VIRTUAL_SIZE(N) == 2? builtin_type_unsigned_int : builtin_type_long)
|
||
|
||
/*#define INIT_FRAME_PC(x,y) init_frame_pc(x,y) */
|
||
/* Initializer for an array of names of registers.
|
||
Entries beyond the first NUM_REGS are ignored. */
|
||
|
||
#define REGISTER_NAMES \
|
||
{"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
|
||
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
|
||
"ccr", "pc", "cycles","insts","time","fp","sp"}
|
||
|
||
/* 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 CCR_REGNUM 16 /* Contains processor status */
|
||
#define PC_REGNUM 17 /* Contains program counter */
|
||
#define CYCLES_REGNUM 18
|
||
#define INSTS_REGNUM 19
|
||
#define TIME_REGNUM 20
|
||
#define FP_REGNUM 21 /* Contains fp, whatever memory model */
|
||
#define SP_REGNUM 22 /* Conatins sp, whatever memory model */
|
||
|
||
|
||
|
||
#define PTR_SIZE (BIG ? 4: 2)
|
||
#define PTR_MASK (BIG ? 0xff00ffff : 0x0000ffff)
|
||
|
||
/* Store the address of the place in which to copy the structure the
|
||
subroutine will return. This is called from call_function. */
|
||
|
||
#define STORE_STRUCT_RETURN(ADDR, SP) internal_error (__FILE__, __LINE__, "failed internal consistency check");
|
||
|
||
/* 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. This is assuming that floating point values are returned
|
||
as doubles in d0/d1. */
|
||
|
||
|
||
#define DEPRECATED_EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
|
||
memcpy(VALBUF, REGBUF + REGISTER_BYTE(2), TYPE_LENGTH(TYPE));
|
||
|
||
/* Write into appropriate registers a function return value
|
||
of type TYPE, given in virtual format. */
|
||
|
||
#define DEPRECATED_STORE_RETURN_VALUE(TYPE,VALBUF) internal_error (__FILE__, __LINE__, "failed internal consistency check");
|
||
|
||
/* 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 DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
|
||
|
||
/* 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 Z8000, the frame's nominal address
|
||
is the address of a ptr sized byte word containing the calling
|
||
frame's address. */
|
||
|
||
extern CORE_ADDR z8k_frame_chain (struct frame_info *thisframe);
|
||
#define FRAME_CHAIN(thisframe) z8k_frame_chain(thisframe);
|
||
|
||
|
||
|
||
/* 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. */
|
||
#define FRAMELESS_FUNCTION_INVOCATION(FI) \
|
||
(frameless_look_for_prologue (FI))
|
||
|
||
extern CORE_ADDR z8k_frame_saved_pc (struct frame_info *frame);
|
||
#define FRAME_SAVED_PC(FRAME) z8k_frame_saved_pc(FRAME)
|
||
|
||
#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
|
||
|
||
#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
|
||
|
||
/* 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. */
|
||
#if !defined (FRAME_NUM_ARGS)
|
||
#define FRAME_NUM_ARGS(fi) (-1)
|
||
#endif
|
||
|
||
/* Return number of bytes at start of arglist that are not really args. */
|
||
|
||
#define FRAME_ARGS_SKIP 8
|
||
|
||
struct frame_info;
|
||
extern void z8k_frame_init_saved_regs (struct frame_info *);
|
||
#define FRAME_INIT_SAVED_REGS(fi) z8k_frame_init_saved_regs (fi)
|
||
|
||
|
||
/* Things needed for making the inferior call functions.
|
||
It seems like every m68k based machine has almost identical definitions
|
||
in the individual machine's configuration files. Most other cpu types
|
||
(mips, i386, etc) have routines in their *-tdep.c files to handle this
|
||
for most configurations. The m68k family should be able to do this as
|
||
well. These macros can still be overridden when necessary. */
|
||
|
||
/* The CALL_DUMMY macro is the sequence of instructions, as disassembled
|
||
by gdb itself:
|
||
|
||
fmovemx fp0-fp7,sp@- 0xf227 0xe0ff
|
||
moveml d0-a5,sp@- 0x48e7 0xfffc
|
||
clrw sp@- 0x4267
|
||
movew ccr,sp@- 0x42e7
|
||
|
||
/..* The arguments are pushed at this point by GDB;
|
||
no code is needed in the dummy for this.
|
||
The CALL_DUMMY_START_OFFSET gives the position of
|
||
the following jsr instruction. *../
|
||
|
||
jsr @#0x32323232 0x4eb9 0x3232 0x3232
|
||
addal #0x69696969,sp 0xdffc 0x6969 0x6969
|
||
trap #<your BPT_VECTOR number here> 0x4e4?
|
||
nop 0x4e71
|
||
|
||
Note this is CALL_DUMMY_LENGTH bytes (28 for the above example).
|
||
We actually start executing at the jsr, 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 jsr would be pushed
|
||
between the moveml and the jsr, 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 the moveml to push the registers again lest
|
||
they be taken for the arguments. */
|
||
|
||
|
||
#define CALL_DUMMY { 0 }
|
||
#define CALL_DUMMY_LENGTH 24 /* Size of CALL_DUMMY */
|
||
#define CALL_DUMMY_START_OFFSET 8 /* Offset to jsr instruction */
|
||
|
||
|
||
/* Insert the specified number of args and function address
|
||
into a call sequence of the above form stored at DUMMYNAME.
|
||
We use the BFD routines to store a big-endian value of known size. */
|
||
|
||
#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
|
||
{ bfd_putb32 (fun, (char *) dummyname + CALL_DUMMY_START_OFFSET + 2); \
|
||
bfd_putb32 (nargs*4, (char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
|
||
|
||
/* Push an empty stack frame, to record the current PC, etc. */
|
||
|
||
#define PUSH_DUMMY_FRAME { z8k_push_dummy_frame (); }
|
||
|
||
extern void z8k_push_dummy_frame (void);
|
||
|
||
extern void z8k_pop_frame (void);
|
||
|
||
/* Discard from the stack the innermost frame, restoring all registers. */
|
||
|
||
#define POP_FRAME { z8k_pop_frame (); }
|
||
|
||
/* Offset from SP to first arg on stack at first instruction of a function */
|
||
|
||
#define SP_ARG0 (1 * 4)
|
||
|
||
extern CORE_ADDR z8k_addr_bits_remove (CORE_ADDR);
|
||
#define ADDR_BITS_REMOVE(addr) z8k_addr_bits_remove (addr)
|
||
int sim_z8001_mode;
|
||
#define BIG (sim_z8001_mode)
|
||
|
||
#define read_memory_short(x) (read_memory_integer(x,2) & 0xffff)
|
||
|
||
#define NO_STD_REGS
|
||
|
||
extern void z8k_print_register_hook (int regno);
|
||
#define PRINT_REGISTER_HOOK(regno) z8k_print_register_hook(regno)
|
||
|
||
|
||
extern void z8k_set_pointer_size (int newsize);
|
||
#define INIT_EXTRA_SYMTAB_INFO \
|
||
z8k_set_pointer_size(objfile->obfd->arch_info->bits_per_address);
|
||
|
||
#define REGISTER_SIZE 4
|