Polishing z8k simulator support

1 files changed, 315 insertions, 0 deletions

diff --git a/gdb/tm-z8k.h b/gdb/tm-z8k.h
new file mode 100644
index 0000000..7284e4f
--- /dev/null
+++ b/gdb/tm-z8k.h
@@ -0,0 +1,315 @@
+/* Parameters for execution on a z8000 series machine.
+   Copyright 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+
+#define IEEE_FLOAT 1
+
+#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)
+
+/* Define the bit, byte, and word ordering of the machine.  */
+#define TARGET_BYTE_ORDER BIG_ENDIAN
+
+/* 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)   {(ip) = z8k_skip_prologue(ip);}
+extern CORE_ADDR mz8k_skip_prologue PARAMS ((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.  */
+
+#define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call(frame)
+
+/* Stack grows downward.  */
+
+#define INNER_THAN <
+
+/* 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
+
+/* Nonzero if instruction at PC is a return instruction.  */
+/* Allow any of the return instructions, including a trapv and a return
+   from interupt.  */
+
+#define ABOUT_TO_RETURN(pc) about_to_return(pc)
+
+/* Return 1 if P points to an invalid floating point value.  */
+
+#define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
+
+/* 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
+
+/* Nonzero if register N requires conversion
+   from raw format to virtual format.  */
+
+#define REGISTER_CONVERTIBLE(N) 0
+
+/* Convert data from raw format for register REGNUM
+   to virtual format for register REGNUM.  */
+
+#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
+ register_convert_to_virtual(REGNUM, FROM, TO)
+
+/* Convert data from virtual format for register REGNUM
+   to raw format for register REGNUM.  */
+
+#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
+ register_convert_to_raw(REGNUM, FROM, TO)
+
+/* 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) store_struct_return(ADDR,SP)
+
+/* 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 EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
+ extract_return_value(TYPE,REGBUF,VALBUF)
+
+/* Write into appropriate registers a function return value
+   of type TYPE, given in virtual format.  Assumes floats are passed
+   in d0/d1.  */
+
+#define STORE_RETURN_VALUE(TYPE,VALBUF) store_return_value(TYPE,VALBUF);
+
+/* 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) (*(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 68000, the frame's nominal address
+   is the address of a 4-byte word containing the calling frame's address.  */
+
+#define FRAME_CHAIN(thisframe)  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) \
+  (FRAMELESS) = frameless_look_for_prologue(FI)
+
+#define FRAME_SAVED_PC(FRAME) 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(val,fi) (val = -1)
+#endif
+
+/* Return number of bytes at start of arglist that are not really args.  */
+
+#define FRAME_ARGS_SKIP 8
+
+
+
+/* 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)     \
+{ _do_putb32 (fun,     (char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
+  _do_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 PARAMS ((void));
+
+extern void z8k_pop_frame PARAMS ((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)
+
+#define ADDR_BITS_REMOVE(x) addr_bits_remove(x)
+#define ADDR_BITS_SET(x) addr_bits_set(x)
+int z8001_mode;
+#define BIG (z8001_mode)
+
+#define read_memory_short(x)  (read_memory_integer(x,2) & 0xffff)
+
+#define NO_STD_REGS
+
+
+
+#define	PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
+
+
+/* Define this if the C compiler puts an underscore at the front
+   of external names before giving them to the linker.  */
+
+#define NAMES_HAVE_UNDERSCORE
+
+#define ADDITIONAL_OPTIONS {"z8001",no_argument,&z8001_mode, 1},