Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 393 insertions, 0 deletions

diff --git a/gdb/config/m68k/tm-m68k.h b/gdb/config/m68k/tm-m68k.h
new file mode 100644
index 0000000..098500c
--- /dev/null
+++ b/gdb/config/m68k/tm-m68k.h
@@ -0,0 +1,393 @@
+/* Parameters for execution on a 68000 series machine.
+   Copyright 1986, 1987, 1989, 1990, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Generic 68000 stuff, to be included by other tm-*.h files.  */
+
+#define IEEE_FLOAT 1
+
+/* 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.  */
+
+#if !defined(SKIP_PROLOGUE)
+#define SKIP_PROLOGUE(ip)   {(ip) = m68k_skip_prologue(ip);}
+extern CORE_ADDR m68k_skip_prologue PARAMS ((CORE_ADDR ip));
+#endif
+
+/* 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.  */
+
+#ifdef __STDC__
+struct frame_info;
+struct frame_saved_regs;
+#endif
+
+extern CORE_ADDR m68k_saved_pc_after_call PARAMS ((struct frame_info *));
+extern void m68k_find_saved_regs PARAMS ((struct frame_info *, struct frame_saved_regs *));
+
+#define SAVED_PC_AFTER_CALL(frame) \
+  m68k_saved_pc_after_call(frame)
+
+/* Stack grows downward.  */
+
+#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
+
+/* Stack must be kept short aligned when doing function calls.  */
+
+#define STACK_ALIGN(ADDR) (((ADDR) + 1) & ~1)
+
+/* Sequence of bytes for breakpoint instruction.
+   This is a TRAP instruction.  The last 4 bits (0xf below) is the
+   vector.  Systems which don't use 0xf should define BPT_VECTOR
+   themselves before including this file.  */
+
+#if !defined (BPT_VECTOR)
+#define BPT_VECTOR 0xf
+#endif
+
+#if !defined (BREAKPOINT)
+#define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)}
+#endif
+
+/* We default to vector 1 for the "remote" target, but allow targets
+   to override.  */
+#if !defined (REMOTE_BPT_VECTOR)
+#define REMOTE_BPT_VECTOR 1
+#endif
+
+#if !defined (REMOTE_BREAKPOINT)
+#define REMOTE_BREAKPOINT {0x4e, (0x40 | REMOTE_BPT_VECTOR)}
+#endif
+
+/* If your kernel resets the pc after the trap happens you may need to
+   define this before including this file.  */
+
+#if !defined (DECR_PC_AFTER_BREAK)
+#define DECR_PC_AFTER_BREAK 2
+#endif
+
+/* Say how long (ordinary) registers are.  This is a piece of bogosity
+   used in push_word and a few other places; REGISTER_RAW_SIZE is the
+   real way to know how big a register is.  */
+
+#define REGISTER_SIZE 4
+
+#define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4)
+#define REGISTER_BYTES_NOFP (16*4 + 8)
+
+#ifndef NUM_REGS
+#define NUM_REGS 29
+#endif
+
+#define NUM_FREGS (NUM_REGS-24)
+
+#ifndef REGISTER_BYTES_OK
+#define REGISTER_BYTES_OK(b) \
+   ((b) == REGISTER_BYTES_FP \
+    || (b) == REGISTER_BYTES_NOFP)
+#endif
+
+#ifndef REGISTER_BYTES
+#define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4)
+#endif
+
+/* Index within `registers' of the first byte of the space for
+   register N.  */
+
+#define REGISTER_BYTE(N)  \
+ ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168	\
+  : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72	\
+  : (N) * 4)
+
+/* Number of bytes of storage in the actual machine representation
+   for register N.  On the 68000, all regs are 4 bytes
+   except the floating point regs which are 12 bytes.  */
+/* Note that the unsigned cast here forces the result of the
+   subtraction to very high positive values if N < FP0_REGNUM */
+
+#define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)
+
+/* Number of bytes of storage in the program's representation
+   for register N.  On the 68000, all regs are 4 bytes
+   except the floating point regs which are 8-byte doubles.  */
+
+#define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4)
+
+/* Largest value REGISTER_RAW_SIZE can have.  */
+
+#define MAX_REGISTER_RAW_SIZE 12
+
+/* Largest value REGISTER_VIRTUAL_SIZE can have.  */
+
+#define MAX_REGISTER_VIRTUAL_SIZE 8
+
+/* Nonzero if register N requires conversion
+   from raw format to virtual format.  */
+
+#define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8)
+
+#include "floatformat.h"
+
+/* Convert data from raw format for register REGNUM in buffer FROM
+   to virtual format with type TYPE in buffer TO.  */
+
+#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
+do									\
+  {									\
+    DOUBLEST dbl_tmp_val;							\
+    floatformat_to_doublest (&floatformat_m68881_ext, (FROM), &dbl_tmp_val); \
+    store_floating ((TO), TYPE_LENGTH (TYPE), dbl_tmp_val);		\
+  } while (0)
+
+/* Convert data from virtual format with type TYPE in buffer FROM
+   to raw format for register REGNUM in buffer TO.  */
+
+#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO)	\
+do									\
+  {									\
+    DOUBLEST dbl_tmp_val;						\
+    dbl_tmp_val = extract_floating ((FROM), TYPE_LENGTH (TYPE));	\
+    floatformat_from_doublest (&floatformat_m68881_ext, &dbl_tmp_val, (TO)); \
+  } while (0)
+
+/* Return the GDB type object for the "standard" data type of data 
+   in register N.  This should be int for D0-D7, double for FP0-FP7,
+   and void pointer for all others (A0-A7, PC, SR, FPCONTROL etc).
+   Note, for registers which contain addresses return pointer to void, 
+   not pointer to char, because we don't want to attempt to print 
+   the string after printing the address.  */
+
+#define REGISTER_VIRTUAL_TYPE(N) \
+  ((unsigned) (N) >= FPC_REGNUM ? lookup_pointer_type (builtin_type_void) : \
+   (unsigned) (N) >= FP0_REGNUM ? builtin_type_double :                     \
+   (unsigned) (N) >=  A0_REGNUM ? lookup_pointer_type (builtin_type_void) : \
+   builtin_type_int)
+
+/* Initializer for an array of names of registers.
+   Entries beyond the first NUM_REGS are ignored.  */
+
+#define REGISTER_NAMES  \
+ {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
+  "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \
+  "ps", "pc",  \
+  "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \
+  "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" }
+
+/* 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 D0_REGNUM 0
+#define A0_REGNUM 8
+#define A1_REGNUM 9
+#define FP_REGNUM 14		/* Contains address of executing stack frame */
+#define SP_REGNUM 15		/* Contains address of top of stack */
+#define PS_REGNUM 16		/* Contains processor status */
+#define PC_REGNUM 17		/* Contains program counter */
+#define FP0_REGNUM 18		/* Floating point register 0 */
+#define FPC_REGNUM 26		/* 68881 control register */
+#define FPS_REGNUM 27		/* 68881 status register */
+#define FPI_REGNUM 28		/* 68881 iaddr register */
+
+/* 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) \
+  { write_register (A1_REGNUM, (ADDR)); }
+
+/* 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.  */
+
+#if !defined (EXTRACT_RETURN_VALUE)
+#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
+  memcpy ((VALBUF),							\
+	  (char *)(REGBUF) +						\
+	         (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)),	\
+	  TYPE_LENGTH(TYPE))
+#endif
+
+/* Write into appropriate registers a function return value
+   of type TYPE, given in virtual format.  Assumes floats are passed
+   in d0/d1.  */
+
+#if !defined (STORE_RETURN_VALUE)
+#define STORE_RETURN_VALUE(TYPE,VALBUF) \
+  write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
+#endif
+
+/* 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.  */
+
+/* If we are chaining from sigtramp, then manufacture a sigtramp frame
+   (which isn't really on the stack.  I'm not sure this is right for anything
+   but BSD4.3 on an hp300.  */
+#define FRAME_CHAIN(thisframe)  \
+  (thisframe->signal_handler_caller \
+   ? thisframe->frame \
+   : (!inside_entry_file ((thisframe)->pc) \
+      ? read_memory_integer ((thisframe)->frame, 4) \
+      : 0))
+
+/* 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) \
+  do { \
+    if ((FI)->signal_handler_caller) \
+      (FRAMELESS) = 0; \
+    else \
+      (FRAMELESS) = frameless_look_for_prologue(FI); \
+  } while (0)
+
+/* This was determined by experimentation on hp300 BSD 4.3.  Perhaps
+   it corresponds to some offset in /usr/include/sys/user.h or
+   something like that.  Using some system include file would
+   have the advantage of probably being more robust in the face
+   of OS upgrades, but the disadvantage of being wrong for
+   cross-debugging.  */
+
+#define SIG_PC_FP_OFFSET 530
+
+#define FRAME_SAVED_PC(FRAME) \
+  (((FRAME)->signal_handler_caller \
+    ? ((FRAME)->next \
+       ? read_memory_integer ((FRAME)->next->frame + SIG_PC_FP_OFFSET, 4) \
+       : read_memory_integer (read_register (SP_REGNUM) \
+			      + SIG_PC_FP_OFFSET - 8, 4) \
+       ) \
+    : read_memory_integer ((FRAME)->frame + 4, 4)) \
+   )
+
+#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
+
+/* Put here the code to store, into a struct frame_saved_regs,
+   the addresses of the saved registers of frame described by FRAME_INFO.
+   This includes special registers such as pc and fp saved in special
+   ways in the stack frame.  sp is even more special:
+   the address we return for it IS the sp for the next frame.  */
+
+#if !defined (FRAME_FIND_SAVED_REGS)
+#define FRAME_FIND_SAVED_REGS(fi,fsr) m68k_find_saved_regs ((fi), &(fsr))
+#endif /* no FIND_FRAME_SAVED_REGS.  */
+
+
+/* Things needed for making the inferior call functions.  */
+
+/* The CALL_DUMMY macro is the sequence of instructions, as disassembled
+   by gdb itself:
+
+   These instructions exist only so that m68k_find_saved_regs can parse
+   them as a "prologue"; they are never executed.
+
+	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.  That is where we start
+   executing.
+
+	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).
+
+   The dummy frame always saves the floating-point registers, whether they
+   actually exist on this target or not.  */
+
+/* FIXME: Wrong to hardwire this as BPT_VECTOR when sometimes it
+   should be REMOTE_BPT_VECTOR.  Best way to fix it would be to define
+   CALL_DUMMY_BREAKPOINT_OFFSET.  */
+
+#define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))}
+#define CALL_DUMMY_LENGTH 28		/* Size of CALL_DUMMY */
+#define CALL_DUMMY_START_OFFSET 12	/* Offset to jsr instruction*/
+#define CALL_DUMMY_BREAKPOINT_OFFSET (CALL_DUMMY_START_OFFSET + 12)
+
+/* 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,     (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 2);  \
+  bfd_putb32 (nargs*4, (unsigned char *) dummyname + CALL_DUMMY_START_OFFSET + 8); }
+
+/* Push an empty stack frame, to record the current PC, etc.  */
+
+#define PUSH_DUMMY_FRAME	{ m68k_push_dummy_frame (); }
+
+extern void m68k_push_dummy_frame PARAMS ((void));
+
+extern void m68k_pop_frame PARAMS ((void));
+
+/* Discard from the stack the innermost frame, restoring all registers.  */
+
+#define POP_FRAME		{ m68k_pop_frame (); }
+
+/* Offset from SP to first arg on stack at first instruction of a function */
+
+#define SP_ARG0 (1 * 4)
+
+#define TARGET_M68K