/* Parameters for execution on a 68000 series machine.
- Copyright (C) 1986, 1987, 1989, 1990 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1989, 1990, 1992 Free Software Foundation, Inc.
This file is part of GDB.
-GDB is free software; you can redistribute it and/or modify
+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 1, or (at your option)
-any later version.
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
-GDB is distributed in the hope that it will be useful,
+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 GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-/* Generic 68000 stuff, to be included by other m-*.h files.
+/* Generic 68000 stuff, to be included by other tm-*.h files.
Define HAVE_68881 if that is the case. */
#if defined (HAVE_68881)
/* Advance PC across any function entry prologue instructions
to reach some "real" code. */
-#define SKIP_PROLOGUE(pc) \
-{ register int op = read_memory_integer (pc, 2); \
- if (op == 0047126) \
- pc += 4; /* Skip link #word */ \
- else if (op == 0044016) \
- pc += 6; /* Skip link #long */ \
- /* Not sure why branches are here. */ \
- /* From m-isi.h, m-altos.h */ \
- else if (op == 0060000) \
- pc += 4; /* Skip bra #word */ \
- else if (op == 00600377) \
- pc += 6; /* skip bra #long */ \
- else if ((op & 0177400) == 0060000) \
- pc += 2; /* skip bra #char */ \
-}
+#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
/* 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 BREAKPOINT
+ 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, 0x4f}
+#define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)}
#endif
/* If your kernel resets the pc after the trap happens you may need to
- define this in m-68k.h. */
+ define this before including this file. */
#if !defined (DECR_PC_AFTER_BREAK)
#define DECR_PC_AFTER_BREAK 2
#define REGISTER_TYPE long
#if defined (HAVE_68881)
-# if defined (TARGET_SUN3)
+# if defined (GDB_TARGET_IS_SUN3)
/* Sun3 status includes fpflags, which shows whether the FPU has been used
by the process, and whether the FPU was done with an instruction or
was interrupted in the middle of a long instruction. See
/* Put the declaration out here because if it's in the macros, PCC
will complain. */
-extern struct ext_format ext_format_68881 [];
+extern const struct ext_format ext_format_68881;
/* Convert data from raw format for register REGNUM
to virtual format for register REGNUM. */
#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
{ \
if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \
- ieee_extended_to_double (ext_format_68881, (FROM), (TO)); \
+ ieee_extended_to_double (&ext_format_68881, (FROM), (double *)(TO)); \
else \
- bcopy ((FROM), (TO), 4); \
+ memcpy ((TO), (FROM), 4); \
}
/* Convert data from virtual format for register REGNUM
#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
{ \
if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \
- double_to_ieee_extended (ext_format_68881, (FROM), (TO)); \
+ double_to_ieee_extended (&ext_format_68881, (double *)(FROM), (TO)); \
else \
- bcopy ((FROM), (TO), 4); \
+ memcpy ((TO), (FROM), 4); \
}
/* Return the GDB type object for the "standard" data type
/* Convert data from raw format for register REGNUM
to virtual format for register REGNUM. */
-#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) bcopy ((FROM), (TO), 4);
+#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) memcpy ((TO), (FROM), 4);
/* Convert data from virtual format for register REGNUM
to raw format for register REGNUM. */
-#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) bcopy ((FROM), (TO), 4);
+#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) memcpy ((TO), (FROM), 4);
/* Return the GDB type object for the "standard" data type
of data in register N. */
#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 */
#endif /* 68881. */
/* Store the address of the place in which to copy the structure the
#if !defined (EXTRACT_RETURN_VALUE)
#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
- bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
+ 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
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) (*(int *)(REGBUF))
+#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF))
\f
/* 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.
-
- FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
- and produces the nominal address of the caller frame.
-
- However, if FRAME_CHAIN_VALID returns zero,
- it means the given frame is the outermost one and has no caller.
- In that case, FRAME_CHAIN_COMBINE is not used. */
-
-/* In the case of the 68000, the frame's nominal address
+/* 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) \
- (outside_startup_file ((thisframe)->pc) ? \
+ (!inside_entry_file ((thisframe)->pc) ? \
read_memory_integer ((thisframe)->frame, 4) :\
0)
-#define FRAME_CHAIN_VALID(chain, thisframe) \
- (chain != 0 && outside_startup_file (FRAME_SAVED_PC (thisframe)))
-
-#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
-
/* Define other aspects of the stack frame. */
/* A macro that tells us whether the function invocation represented
for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \
if (regmask & 1) \
(frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
- else if (0x2f00 == 0xfff0 & read_memory_integer (pc, 2)) \
+ else if (0x2f00 == (0xfff0 & read_memory_integer (pc, 2))) \
{ regnum = 0xf & read_memory_integer (pc, 2); pc += 2; \
(frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
/* clrw -(sp); movw ccr,-(sp) may follow. */ \
#endif /* no 68881. */
#endif /* no FIND_FRAME_SAVED_REGS. */
-/* Note that stuff for calling inferior functions is not in this file
- because the call dummy is different for different breakpoint
- instructions, which are different on different systems. Perhaps
- they could be merged, but I haven't bothered. */
+\f
+/* 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. */
+
+#if defined (HAVE_68881)
+
+#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*/
+
+#else
+
+#define CALL_DUMMY {0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, (0x4e404e71 | (BPT_VECTOR << 16))}
+#define CALL_DUMMY_LENGTH 24 /* Size of CALL_DUMMY */
+#define CALL_DUMMY_START_OFFSET 8 /* Offset to jsr instruction*/
+
+#endif /* HAVE_68881 */
+
+/* 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 { 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)
projects / deliverable / binutils-gdb.git / blobdiff