Johns release

1 files changed, 399 insertions, 0 deletions

diff --git a/gdb/tm-i960.h b/gdb/tm-i960.h
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+/* Parameters for target machine Intel 960, for GDB, the GNU debugger.
+   Copyright (C) 1990-1991 Free Software Foundation, Inc.
+   Contributed by Intel Corporation.
+This file is part of GDB.
+
+GDB 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.
+
+GDB 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.  */
+
+/* Definitions to target GDB to any i960.  */
+
+#ifndef I80960
+#define I80960
+#endif
+
+/* Hook for the SYMBOL_CLASS of a parameter when decoding DBX symbol
+   information.  In the i960, parameters can be stored as locals or as
+   args, depending on the type of the debug record.
+
+   From empirical observation, gcc960 uses N_LSYM to indicate
+   arguments passed in registers and then copied immediately
+   to the frame, and N_PSYM to indicate arguments passed in a
+   g14-relative argument block.  */
+
+#define	DBX_PARM_SYMBOL_CLASS(type) ((type == N_LSYM)? LOC_LOCAL_ARG: LOC_ARG)
+
+/* Byte order is configurable, but this machine runs little-endian.  */
+#define	TARGET_BYTE_ORDER	LITTLE_ENDIAN
+
+/* We have IEEE floating point, if we have any float at all.  */
+
+#define IEEE_FLOAT
+
+/* 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
+
+
+/* Offset from address of function to start of its code.
+   Zero on most machines.  */
+
+#define FUNCTION_START_OFFSET 0
+
+/* Advance ip across any function entry prologue instructions
+   to reach some "real" code.  */
+
+#define SKIP_PROLOGUE(ip)	{ ip = skip_prologue (ip); }
+extern CORE_ADDR skip_prologue ();
+
+/* Immediately after a function call, return the saved ip.
+   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))
+extern CORE_ADDR saved_pc_after_call ();
+
+/* Stack grows upward */
+
+#define INNER_THAN >
+
+/* Nonzero if instruction at ip is a return instruction.  */
+
+#define ABOUT_TO_RETURN(ip) (read_memory_integer(ip,4) == 0x0a000000)
+
+/* Return 1 if P points to an invalid floating point value.
+   LEN is the length in bytes.  */
+
+#define INVALID_FLOAT(p, len) (0)
+
+/* How long (ordinary) registers are */
+
+#define REGISTER_TYPE long
+
+/* Number of machine registers */
+#define NUM_REGS 40
+
+/* Initializer for an array of names of registers.
+   There should be NUM_REGS strings in this initializer.  */
+
+#define REGISTER_NAMES { \
+	/*  0 */ "pfp", "sp",  "rip", "r3",  "r4",  "r5",  "r6",  "r7", \
+	/*  8 */ "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",\
+	/* 16 */ "g0",  "g1",  "g2",  "g3",  "g4",  "g5",  "g6",  "g7", \
+	/* 24 */ "g8",  "g9",  "g10", "g11", "g12", "g13", "g14", "fp", \
+	/* 32 */ "pc",  "ac",  "ip",  "tc",  "fp0", "fp1", "fp2", "fp3",       \
+}
+
+/* Register numbers of various important registers (used to index
+   into arrays of register names and register values).  */
+
+#define R0_REGNUM   0	/* First local register		*/
+#define SP_REGNUM   1	/* Contains address of top of stack */
+#define RIP_REGNUM  2	/* Return instruction pointer (local r2) */
+#define R15_REGNUM 15	/* Last local register		*/
+#define G0_REGNUM  16	/* First global register	*/
+#define G13_REGNUM 29	/* g13 - holds struct return address */
+#define G14_REGNUM 30	/* g14 - ptr to arg block / leafproc return address */
+#define FP_REGNUM  31	/* Contains address of executing stack frame */
+#define	PCW_REGNUM 32	/* process control word */
+#define	ACW_REGNUM 33	/* arithmetic control word */
+#define	IP_REGNUM  34	/* instruction pointer */
+#define	TCW_REGNUM 35	/* trace control word */
+#define FP0_REGNUM 36	/* First floating point register */
+
+/* Some registers have more than one name */
+
+#define PC_REGNUM  IP_REGNUM	/* GDB refers to ip as the Program Counter */
+#define PFP_REGNUM R0_REGNUM	/* Previous frame pointer	*/
+
+/* Total amount of space needed to store our copies of the machine's
+   register state, the array `registers'.  */
+#define REGISTER_BYTES ((36*4) + (4*10))
+
+/* Index within `registers' of the first byte of the space for register N.  */
+
+#define REGISTER_BYTE(N) ( (N) < FP0_REGNUM ? \
+				(4*(N)) : ((10*(N)) - (6*FP0_REGNUM)) )
+
+/* The i960 has register windows, sort of.  */
+
+#define HAVE_REGISTER_WINDOWS
+
+/* Is this register part of the register window system?  A yes answer
+   implies that 1) The name of this register will not be the same in
+   other frames, and 2) This register is automatically "saved" upon
+   subroutine calls and thus there is no need to search more than one
+   stack frame for it.
+   
+   On the i960, in fact, the name of this register in another frame is
+   "mud" -- there is no overlap between the windows.  Each window is
+   simply saved into the stack (true for our purposes, after having been
+   flushed; normally they reside on-chip and are restored from on-chip
+   without ever going to memory).  */
+
+#define REGISTER_IN_WINDOW_P(regnum)	((regnum) <= R15_REGNUM)
+
+/* Number of bytes of storage in the actual machine representation
+   for register N.  On the i960, all regs are 4 bytes except for floating
+   point, which are 10.  NINDY only sends us 8 byte values for these,
+   which is a pain, but VxWorks handles this correctly, so we must.  */
+
+#define REGISTER_RAW_SIZE(N)		( (N) < FP0_REGNUM ? 4 : 10 )
+
+/* Number of bytes of storage in the program's representation for register N. */
+
+#define REGISTER_VIRTUAL_SIZE(N)	( (N) < FP0_REGNUM ? 4 : 8 )
+
+/* Largest value REGISTER_RAW_SIZE can have.  */
+
+#define MAX_REGISTER_RAW_SIZE 10
+
+/* 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) ((N) >= FP0_REGNUM)
+
+/* Convert data from raw format for register REGNUM
+   to virtual format for register REGNUM.  */
+
+#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)     \
+{ \
+  extern struct ext_format ext_format_i960[];		\
+  \
+  if ((REGNUM) >= FP0_REGNUM)   \
+    ieee_extended_to_double (ext_format_i960, (FROM), (TO));     \
+  else                                  \
+    bcopy ((FROM), (TO), 4);	\
+}
+
+/* Convert data from virtual format for register REGNUM
+   to raw format for register REGNUM.  */
+
+#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
+{ \
+  extern struct ext_format ext_format_i960[];		\
+  \
+  if ((REGNUM) >= FP0_REGNUM)   \
+    double_to_ieee_extended (ext_format_i960, (FROM), (TO));     \
+  else                                  \
+    bcopy ((FROM), (TO), 4); 	\
+}
+
+
+/* Return the GDB type object for the "standard" data type
+   of data in register N.  */
+
+#define REGISTER_VIRTUAL_TYPE(N) ((N) < FP0_REGNUM ? \
+					builtin_type_int : builtin_type_double)
+
+/* Macros for understanding function return values... */
+
+/* Does the specified function use the "struct returning" convention
+   or the "value returning" convention?  The "value returning" convention
+   almost invariably returns the entire value in registers.  The
+   "struct returning" convention often returns the entire value in
+   memory, and passes a pointer (out of or into the function) saying
+   where the value (is or should go).
+
+   Since this sometimes depends on whether it was compiled with GCC,
+   this is also an argument.  This is used in call_function to build a
+   stack, and in value_being_returned to print return values.
+
+   On i960, a structure is returned in registers g0-g3, if it will fit.
+   If it's more than 16 bytes long, g13 pointed to it on entry.  */
+
+#define USE_STRUCT_CONVENTION(gcc_p, type) (TYPE_LENGTH (type) > 16)
+
+/* 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 only called if USE_STRUCT_CONVENTION for this
+   type is 0.
+
+   On the i960 we just take as many bytes as we need from G0 through G3.  */
+
+#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
+	bcopy(REGBUF+REGISTER_BYTE(G0_REGNUM), VALBUF, TYPE_LENGTH (TYPE))
+
+/* If USE_STRUCT_CONVENTION produces a 1, 
+   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).
+
+   Address of where to put structure was passed in in global
+   register g13 on entry.  God knows what's in g13 now.  The
+   (..., 0) below is to make it appear to return a value, though
+   actually all it does is call error().  */
+
+#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
+   (error("Don't know where large structure is returned on i960"), 0)
+
+/* Write into appropriate registers a function return value
+   of type TYPE, given in virtual format, for "value returning" functions.
+  
+   For 'return' command:  not (yet) implemented for i960.  */
+
+#define STORE_RETURN_VALUE(TYPE,VALBUF) \
+    error ("Returning values from functions is not implemented in i960 gdb")
+
+/* 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) \
+    error ("Returning values from functions is not implemented in i960 gdb")
+
+/* 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.  */
+
+/* We cache information about saved registers in the frame structure,
+   to save us from having to re-scan function prologues every time
+   a register in a non-current frame is accessed.  */
+
+#define EXTRA_FRAME_INFO 	\
+	struct frame_saved_regs *fsr;	\
+	CORE_ADDR arg_pointer;
+
+/* Zero the frame_saved_regs pointer when the frame is initialized,
+   so that FRAME_FIND_SAVED_REGS () will know to allocate and
+   initialize a frame_saved_regs struct the first time it is called.
+   Set the arg_pointer to -1, which is not valid; 0 and other values
+   indicate real, cached values.  */
+
+#define INIT_EXTRA_FRAME_INFO(fi) ((fi)->fsr = 0, (fi)->arg_pointer = -1)
+
+/* On the i960, we get the chain pointer by reading the PFP saved
+   on the stack and clearing the status bits.  */
+
+#define FRAME_CHAIN(thisframe) \
+  (read_memory_integer (FRAME_FP(thisframe), 4) & ~0xf)
+
+#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
+
+/* FRAME_CHAIN_VALID returns zero if the given frame is the outermost one
+   and has no caller.  In that case, FRAME_CHAIN_COMBINE is not used.
+
+   On the i960, each various target system type must define FRAME_CHAIN_VALID,
+   since it differs between NINDY and VxWorks, the two currently supported
+   targets types.  We leave it undefined here.  */
+
+
+/* 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) = (leafproc_return ((FI)->pc) != 0); }
+
+/* Note that in the i960 architecture the return pointer is saved in the
+   *caller's* stack frame.
+  
+   Make sure to zero low-order bits because of bug in 960CA A-step part
+   (instruction addresses should always be word-aligned anyway).  */
+
+#define FRAME_SAVED_PC(frame) \
+			((read_memory_integer(FRAME_CHAIN(frame)+8,4)) & ~3)
+
+/* On the i960, FRAME_ARGS_ADDRESS should return the value of
+   g14 as passed into the frame, if known.  We need a function for this.
+   We cache this value in the frame info if we've already looked it up.  */
+
+#define FRAME_ARGS_ADDRESS(fi) 	\
+  (((fi)->arg_pointer != -1)? (fi)->arg_pointer: frame_args_address (fi, 0))
+extern CORE_ADDR frame_args_address ();		/* i960-tdep.c */
+
+/* This is the same except it should return 0 when
+   it does not really know where the args are, rather than guessing.
+   This value is not cached since it is only used infrequently.  */
+
+#define	FRAME_ARGS_ADDRESS_CORRECT(fi)	(frame_args_address (fi, 1))
+
+#define FRAME_LOCALS_ADDRESS(fi)	(fi)->frame
+
+/* Set NUMARGS to the number of args passed to a frame.
+   Can return -1, meaning no way to tell.  */
+
+#define FRAME_NUM_ARGS(numargs, fi)	(numargs = -1)
+
+/* Return number of bytes at start of arglist that are not really args.  */
+
+#define FRAME_ARGS_SKIP 0
+
+/* Produce the positions of the saved registers in a stack frame.  */
+
+#define FRAME_FIND_SAVED_REGS(frame_info_addr, sr) \
+	frame_find_saved_regs (frame_info_addr, &sr)
+extern void frame_find_saved_regs();		/* See i960-tdep.c */
+
+
+/* Print status when we get a random unexpected signal.  We have more
+   kinds of signals than Unix does... */
+
+#define	PRINT_RANDOM_SIGNAL(stop_signal) print_fault (stop_signal)
+
+/* Things needed for making calls to functions in the inferior process */
+
+/* Push an empty stack frame, to record the current ip, etc.
+  
+   Not (yet?) implemented for i960.  */
+
+#define PUSH_DUMMY_FRAME	\
+error("Function calls into the inferior process are not supported on the i960")
+
+/* Discard from the stack the innermost frame, restoring all registers.  */
+
+#define POP_FRAME \
+	pop_frame ()
+
+
+/* This sequence of words is the instructions
+  
+  	callx 0x00000000
+  	fmark
+ */
+
+/* #define CALL_DUMMY { 0x86003000, 0x00000000, 0x66003e00 } */
+
+/* #define CALL_DUMMY_START_OFFSET 0 *//* Start execution at beginning of dummy */
+
+/* Indicate that we don't support calling inferior child functions.  */
+
+#undef CALL_DUMMY
+
+/* Insert the specified number of args and function address
+   into a call sequence of the above form stored at 'dummyname'.
+  
+   Ignore arg count on i960.  */
+
+/* #define FIX_CALL_DUMMY(dummyname, fun, nargs) *(((int *)dummyname)+1) = fun */
+
+#undef FIX_CALL_DUMMY
+
+
+/* Interface definitions for kernel debugger KDB */
+/* (Not relevant to i960.) */