Johns release

1 files changed, 460 insertions, 0 deletions

diff --git a/gdb/tm-m88k.h b/gdb/tm-m88k.h
new file mode 100644
index 0000000000..1890d6ca67
--- /dev/null
+++ b/gdb/tm-m88k.h
@@ -0,0 +1,460 @@
+/* Copyright (C) 1986, 1987, 1988, 1989, 1990 Free Software Foundation, Inc.
+
+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.  */
+
+/* This is currently for a 88000 running DGUX.  If other 88k ports are
+   done, OS-specific stuff should be moved (see tm-68k.h, for example).  */
+/* g++ support is not yet included.  */
+
+#include "tdesc.h"
+
+#define TARGET_BYTE_ORDER BIG_ENDIAN
+
+/* This is not a CREATE_INFERIOR_HOOK because it also applies to
+   remote debugging.  */
+#define START_INFERIOR_HOOK () \
+  { \
+    extern int safe_to_init_tdesc_context; \
+    extern int tdesc_handle; \
+ \
+    safe_to_init_tdesc_context = 0; \
+    if (tdesc_handle) \
+      { \
+	dc_terminate (tdesc_handle); \
+	tdesc_handle = 0; \
+      } \
+  }
+
+#define EXTRA_FRAME_INFO dc_dcontext_t frame_context;
+#define INIT_EXTRA_FRAME_INFO(fci) \
+  {									 \
+    if (fci->next_frame != NULL)					 \
+      {								 \
+        /* The call to get_prev_context */				 \
+        /* will update current_context for us. */			 \
+        int stack_error = 1;						 \
+        jmp_buf stack_jmp;						 \
+        if (!setjmp (stack_jmp))					 \
+          {								 \
+            prev->frame_context					 \
+              = get_prev_context (next_frame->frame_context);		 \
+            stack_error = 0;						 \
+          }								 \
+        else								 \
+          {								 \
+            stack_error = 0;						 \
+            next_frame->prev = 0;					 \
+            return 0;							 \
+          }  								 \
+        if (!prev->frame_context)					 \
+          {								 \
+            next_frame->prev = 0;					 \
+            return 0;							 \
+          }								 \
+      }								 \
+    else								 \
+      {								 \
+        /* We are creating an arbitrary frame */			 \
+        /* (i.e. we are in create_new_frame).  */			 \
+        extern dc_dcontext_t current_context;				 \
+       								 \
+        fci->frame_context = current_context;				 \
+      }								 \
+  }
+
+#define INIT_FRAME_PC(fromleaf, prev) \
+  {									 \
+    prev->pc = dc_location (prev->frame_context);			 \
+    prev->frame = get_frame_base (prev->pc);  	       	       	       	 \
+  }
+
+#define IEEE_FLOAT
+
+/* Text Description (TDESC) is used by m88k to maintain stack & reg info */
+
+#define TDESC
+
+/* 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
+
+/* Hook for read_relative_register_raw_bytes */
+
+#define READ_RELATIVE_REGISTER_RAW_BYTES
+
+/* 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(frompc)   0
+
+/* The m88k kernel aligns all instructions on 4-byte boundaries.  The
+   kernel also uses the least significant two bits for its own hocus
+   pocus.  When gdb receives an address from the kernel, it needs to
+   preserve those right-most two bits, but gdb also needs to be careful
+   to realize that those two bits are not really a part of the address
+   of an instruction.  Shrug.  */
+
+#define ADDR_BITS_REMOVE(addr) ((addr) & ~3)
+#define ADDR_BITS_SET(addr) (((addr) | 0x00000002) - 4)
+
+/* 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) \
+  (read_register (SRP_REGNUM) & (~3))
+
+/* Address of end of stack space.  */
+
+#define STACK_END_ADDR 0xF0000000
+
+/* Stack grows downward.  */
+
+#define INNER_THAN <
+
+/* Sequence of bytes for breakpoint instruction.  */
+
+/* instruction 0xF000D1FF is 'tb0 0,r0,511'
+   If Bit bit 0 of r0 is clear (always true),
+   initiate exception processing (trap).
+ */
+#define BREAKPOINT {0xF0, 0x00, 0xD1, 0xFF}
+
+/* Address of end of stack space.  */
+
+#define STACK_END_ADDR 0xF0000000
+
+/* Stack grows downward.  */
+
+#define INNER_THAN <
+
+/* Sequence of bytes for breakpoint instruction.  */
+
+/* instruction 0xF000D1FF is 'tb0 0,r0,511'
+   If Bit bit 0 of r0 is clear (always true),
+   initiate exception processing (trap).
+ */
+#define BREAKPOINT {0xF0, 0x00, 0xD1, 0xFF}
+
+/* Amount PC must be decremented by after a breakpoint.
+   This is often the number of bytes in BREAKPOINT
+   but not always.  */
+
+#define DECR_PC_AFTER_BREAK 0
+
+/* Nonzero if instruction at PC is a return instruction.  */
+/* 'jmp r1' or 'jmp.n r1' is used to return from a subroutine. */
+
+#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 2) == 0xF800)
+
+/* Return 1 if P points to an invalid floating point value.
+   LEN is the length in bytes -- not relevant on the 386.  */
+
+#define INVALID_FLOAT(p, len) IEEE_isNAN(p,len)
+
+/* Say how long (ordinary) registers are.  */
+
+#define REGISTER_TYPE long
+
+/* Number of machine registers */
+
+#define NUM_REGS 38
+
+/* Initializer for an array of names of registers.
+   There should be NUM_REGS strings in this initializer.  */
+
+#define REGISTER_NAMES {\
+ 	"r0",\
+	"r1",\
+	"r2",\
+	"r3",\
+	"r4",\
+	"r5",\
+	"r6",\
+	"r7",\
+	"r8",\
+	"r9",\
+	"r10",\
+	"r11",\
+	"r12",\
+	"r13",\
+	"r14",\
+	"r15",\
+	"r16",\
+	"r17",\
+	"r18",\
+	"r19",\
+	"r20",\
+	"r21",\
+	"r22",\
+	"r23",\
+	"r24",\
+	"r25",\
+	"r26",\
+	"r27",\
+	"r28",\
+	"r29",\
+	"r30",\
+	"r31",\
+	"psr",\
+	"fpsr",\
+	"fpcr",\
+	"sxip",\
+	"snip",\
+	"sfip",\
+	"vbr",\
+	"dmt0",\
+	"dmd0",\
+	"dma0",\
+	"dmt1",\
+	"dmd1",\
+	"dma1",\
+	"dmt2",\
+	"dmd2",\
+	"dma2",\
+	"sr0",\
+	"sr1",\
+	"sr2",\
+	"sr3",\
+	"fpecr",\
+	"fphs1",\
+	"fpls1",\
+	"fphs2",\
+	"fpls2",\
+	"fppt",\
+	"fprh",\
+	"fprl",\
+	"fpit",\
+	"fpsr",\
+	"fpcr",\
+	};
+
+
+/* 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 SRP_REGNUM 1		/* Contains subroutine return pointer */
+#define RV_REGNUM 2		/* Contains simple return values */
+#define SRA_REGNUM 12		/* Contains address of struct return values */
+#define FP_REGNUM 30		/* Contains address of executing stack frame */
+#define SP_REGNUM 31		/* Contains address of top of stack */
+#define SXIP_REGNUM 35		/* Contains Shadow Execute Instruction Pointer */
+#define SNIP_REGNUM 36		/* Contains Shadow Next Instruction Pointer */
+#define PC_REGNUM SXIP_REGNUM	/* Program Counter */
+#define NPC_REGNUM SNIP_REGNUM	/* Next Program Counter */
+#define PSR_REGNUM 32           /* Processor Status Register */
+#define FPSR_REGNUM 33		/* Floating Point Status Register */
+#define FPCR_REGNUM 34		/* Floating Point Control Register */
+#define SFIP_REGNUM 37		/* Contains Shadow Fetched Intruction pointer */
+#define NNPC_REGNUM SFIP_REGNUM /* Next Next Program Counter */
+
+/* PSR status bit definitions.  */
+
+#define PSR_MODE		0x80000000
+#define PSR_BYTE_ORDER		0x40000000
+#define PSR_SERIAL_MODE		0x20000000
+#define PSR_CARRY		0x10000000
+#define PSR_SFU_DISABLE		0x000003f0
+#define PSR_SFU1_DISABLE	0x00000008
+#define PSR_MXM			0x00000004
+#define PSR_IND			0x00000002
+#define PSR_SFRZ		0x00000001
+
+/* BCS requires that the SXIP_REGNUM (or PC_REGNUM) contain the address
+   of the next instr to be executed when a breakpoint occurs.  Because
+   the kernel gets the next instr (SNIP_REGNUM), the instr in SNIP needs
+   to be put back into SFIP, and the instr in SXIP should be shifted
+   to SNIP */
+
+/* Are you sitting down?  It turns out that the 88K BCS (binary compatibility
+  standard) folks originally felt that the debugger should be responsible
+  for backing up the IPs, not the kernel (as is usually done).  Well, they
+  have reversed their decision, and in future releases our kernel will be
+  handling the backing up of the IPs.  So, eventually, we won't need to
+  do the SHIFT_INST_REGS stuff.  But, for now, since there are 88K systems out
+  there that do need the debugger to do the IP shifting, and since there
+  will be systems where the kernel does the shifting, the code is a little
+  more complex than perhaps it needs to be (we still go inside SHIFT_INST_REGS,
+  and if the shifting hasn't occurred then gdb goes ahead and shifts).  */
+
+#define SHIFT_INST_REGS
+
+/* Total amount of space needed to store our copies of the machine's
+   register state, the array `registers'.  */
+
+#define REGISTER_BYTES (NUM_REGS * sizeof(REGISTER_TYPE))
+
+/* Index within `registers' of the first byte of the space for
+   register N.  */
+
+#define REGISTER_BYTE(N) ((N)*sizeof(REGISTER_TYPE))
+
+/* Number of bytes of storage in the actual machine representation
+   for register N.  */
+
+#define REGISTER_RAW_SIZE(N) (sizeof(REGISTER_TYPE))
+
+/* Number of bytes of storage in the program's representation
+   for register N. */
+
+#define REGISTER_VIRTUAL_SIZE(N) (sizeof(REGISTER_TYPE))
+
+/* Largest value REGISTER_RAW_SIZE can have.  */
+
+#define MAX_REGISTER_RAW_SIZE (sizeof(REGISTER_TYPE))
+
+/* Largest value REGISTER_VIRTUAL_SIZE can have.
+/* Are FPS1, FPS2, FPR "virtual" regisers? */
+
+#define MAX_REGISTER_VIRTUAL_SIZE (sizeof(REGISTER_TYPE))
+
+/* 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) {bcopy ((FROM), (TO), (sizeof(REGISTER_TYPE)));}
+
+/* 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), (sizeof(REGISTER_TYPE)));}
+
+/* Return the GDB type object for the "standard" data type
+   of data in register N.  */
+
+#define REGISTER_VIRTUAL_TYPE(N) (builtin_type_int)
+
+/* The 88k call/return conventions call for "small" values to be returned
+   into consecutive registers starting from r2.  */
+
+#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
+  bcopy (&(((void *)REGBUF)[REGISTER_BYTE(RV_REGNUM)]), (VALBUF), TYPE_LENGTH (TYPE))
+
+#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
+
+/* Write into appropriate registers a function return value
+   of type TYPE, given in virtual format.  */
+
+#define STORE_RETURN_VALUE(TYPE,VALBUF) \
+  write_register_bytes (2*sizeof(void*), (VALBUF), TYPE_LENGTH (TYPE))
+
+/* In COFF, if PCC says a parameter is a short or a char, do not
+   change it to int (it seems the convention is to change it). */
+
+#define BELIEVE_PCC_PROMOTION 1
+
+/* 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.  */
+
+/* These are just dummies for the 88k because INIT_FRAME_PC sets prev->frame
+   instead.  */
+
+#define FRAME_CHAIN(thisframe) (0)
+
+#define FRAME_CHAIN_VALID(chain, thisframe) (1)
+
+#define FRAME_CHAIN_COMBINE(chain, thisframe) (0)
+
+/* Define other aspects of the stack frame.  */
+
+#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame+4, 4))
+
+#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
+
+#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
+
+/* Return 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
+
+/* 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.  */
+
+/* On the 88k, parameter registers get stored into the so called "homing"
+   area.  This *always* happens when you compiled with GCC and use -g.
+   Also, (with GCC and -g) the saving of the parameter register values
+   always happens right within the function prologue code, so these register
+   values can generally be relied upon to be already copied into their
+   respective homing slots by the time you will normally try to look at
+   them (we hope).
+
+   Note that homing area stack slots are always at *positive* offsets from
+   the frame pointer.  Thus, the homing area stack slots for the parameter
+   registers (passed values) for a given function are actually part of the
+   frame area of the caller.  This is unusual, but it should not present
+   any special problems for GDB.
+
+   Note also that on the 88k, we are only interested in finding the
+   registers that might have been saved in memory.  This is a subset of
+   the whole set of registers because the standard calling sequence allows
+   the called routine to clobber many registers.
+
+   We could manage to locate values for all of the so called "preserved"
+   registers (some of which may get saved within any particular frame) but
+   that would require decoding all of the tdesc information.  Tht would be
+   nice information for GDB to have, but it is not strictly manditory if we
+   can live without the ability to look at values within (or backup to)
+   previous frames.
+*/
+
+#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
+        frame_find_saved_regs (frame_info, &frame_saved_regs)
+
+
+/* When popping a frame on the 88k (say when doing a return command), the
+   calling function only expects to have the "preserved" registers restored.
+   Thus, those are the only ones that we even try to restore here.   */
+
+extern void pop_frame ();
+
+#define POP_FRAME pop_frame ()
+
+/* BCS is a standard for binary compatibility.  This machine uses it.  */
+#define BCS