Johns release

1 files changed, 377 insertions, 0 deletions

diff --git a/gdb/tm-vax.h b/gdb/tm-vax.h
new file mode 100644
index 0000000..c7a91b4
--- /dev/null
+++ b/gdb/tm-vax.h
@@ -0,0 +1,377 @@
+/* Definitions to make GDB run on a vax under 4.2bsd.
+   Copyright (C) 1986, 1987, 1989 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.  */
+
+/* There is one known bug with VAX support that I don't know how to
+   fix:  if you do a backtrace from a signal handler, you get something
+   like:
+#0  0xbc in kill (592, 3)
+#1  0x7f in hand (...) (...)
+#2  0x7fffec7e in ?? (2, 0, 2147478112, 94)
+                  ^^ GDB doesn't know about sigtramp
+#3  0x7fffec70 in ?? (592, 2)
+    ^^^^^^^^^^ wrong address
+#4  0xae in main (...) (...)
+
+when the correct backtrace (as given by adb) is:
+_kill(250,3) from _hand+21
+_hand(2,0,7fffea60,5e) from 7fffec7e
+sigtramp(2,0,7fffea60,5e) from _kill+4
+_kill(250,2) from _main+2e
+_main(1,7fffeac4,7fffeacc) from start+3d
+
+If anyone knows enough about VAX BSD to fix this, please send the
+fix to bug-gdb@prep.ai.mit.edu.  */
+
+#define TARGET_BYTE_ORDER LITTLE_ENDIAN
+
+/* 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
+
+/* Debugger information will be in DBX format.  */
+
+#define READ_DBX_FORMAT
+
+/* Offset from address of function to start of its code.
+   Zero on most machines.  */
+
+#define FUNCTION_START_OFFSET 2
+
+/* Advance PC across any function entry prologue instructions
+   to reach some "real" code.  */
+
+#define SKIP_PROLOGUE(pc)	\
+{ register int op = (unsigned char) read_memory_integer (pc, 1);  \
+  if (op == 0x11) pc += 2;  /* skip brb */			  \
+  if (op == 0x31) pc += 3;  /* skip brw */			  \
+  if (op == 0xC2 &&						  \
+      ((unsigned char) read_memory_integer (pc+2, 1)) == 0x5E)	  \
+    pc += 3;  /* skip subl2 */					  \
+  if (op == 0x9E &&						  \
+      ((unsigned char) read_memory_integer (pc+1, 1)) == 0xAE &&  \
+      ((unsigned char) read_memory_integer(pc+3, 1)) == 0x5E)	  \
+     pc += 4;  /* skip movab */					  \
+  if (op == 0x9E &&						  \
+      ((unsigned char) read_memory_integer (pc+1, 1)) == 0xCE &&  \
+      ((unsigned char) read_memory_integer(pc+4, 1)) == 0x5E)	  \
+    pc += 5;  /* skip movab */					  \
+  if (op == 0x9E &&						  \
+      ((unsigned char) read_memory_integer (pc+1, 1)) == 0xEE &&  \
+      ((unsigned char) read_memory_integer(pc+6, 1)) == 0x5E)	  \
+    pc += 7;  /* skip movab */					  \
+}
+
+/* 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) FRAME_SAVED_PC(frame)
+
+#define TARGET_UPAGES 10
+#define TARGET_NBPG 512
+#define STACK_END_ADDR (0x80000000 - (TARGET_UPAGES * TARGET_NBPG))
+
+/* On the VAX, sigtramp is in the u area.  Can't check the exact
+   addresses because for cross-debugging we don't have VAX include
+   files around.  This should be close enough.  */
+#define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0x80000000))
+
+/* Stack grows downward.  */
+
+#define INNER_THAN <
+
+/* Sequence of bytes for breakpoint instruction.  */
+
+#define BREAKPOINT {3}
+
+/* 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.  */
+
+#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 04)
+
+/* Return 1 if P points to an invalid floating point value.
+   LEN is the length in bytes -- not relevant on the Vax.  */
+
+#define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
+
+/* Say how long (ordinary) registers are.  */
+
+#define REGISTER_TYPE long
+
+/* Number of machine registers */
+
+#define NUM_REGS 17
+
+/* 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", "ap", "fp", "sp", "pc", "ps"}
+
+/* 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 AP_REGNUM 12
+#define FP_REGNUM 13		/* Contains address of executing stack frame */
+#define SP_REGNUM 14		/* Contains address of top of stack */
+#define PC_REGNUM 15		/* Contains program counter */
+#define PS_REGNUM 16		/* Contains processor status */
+
+/* Total amount of space needed to store our copies of the machine's
+   register state, the array `registers'.  */
+#define REGISTER_BYTES (17*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 vax, all regs are 4 bytes.  */
+
+#define REGISTER_RAW_SIZE(N) 4
+
+/* Number of bytes of storage in the program's representation
+   for register N.  On the vax, all regs are 4 bytes.  */
+
+#define REGISTER_VIRTUAL_SIZE(N) 4
+
+/* 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)	\
+  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)	\
+  bcopy ((FROM), (TO), 4);
+
+/* Return the GDB type object for the "standard" data type
+   of data in register N.  */
+
+#define REGISTER_VIRTUAL_TYPE(N) builtin_type_int
+
+/* 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 (1, (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.  */
+
+#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
+  bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
+
+/* Write into appropriate registers a function return value
+   of type TYPE, given in virtual format.  */
+
+#define STORE_RETURN_VALUE(TYPE,VALBUF) \
+  write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
+
+/* 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) (*(int *)(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.
+
+   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 Vax, the frame's nominal address is the FP value,
+   and 12 bytes later comes the saved previous FP value as a 4-byte word.  */
+
+#define FRAME_CHAIN(thisframe)  \
+  (outside_startup_file ((thisframe)->pc) ? \
+   read_memory_integer ((thisframe)->frame + 12, 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
+   by FI does not have a frame on the stack associated with it.  If it
+   does not, FRAMELESS is set to 1, else 0.  */
+/* On the vax, all functions have frames.  */
+#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS)  {(FRAMELESS) = 0;}
+
+/* Saved Pc.  */
+
+#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 16, 4))
+
+/* Cannot find the AP register value directly from the FP value.  Must
+   find it saved in the frame called by this one, or in the AP
+   register for the innermost frame.  However, there is no way to tell
+   the difference between the innermost frame and a frame for which we
+   just don't know the frame that it called (e.g. "info frame
+   0x7ffec789").  For the sake of argument suppose that the stack is
+   somewhat trashed (which is one reason that "info frame" exists).
+   So return 0 (indicating we don't know the address of
+   the arglist) if we don't know what frame this frame calls.  */
+#define FRAME_ARGS_ADDRESS_CORRECT(fi) \
+ (((fi)->next_frame                                  \
+   ? read_memory_integer ((fi)->next_frame + 8, 4)   \
+   : /* read_register (AP_REGNUM) */ 0))
+
+/* In most of GDB, getting the args address is too important to
+   just say "I don't know".  This is sometimes wrong for functions
+   that aren't on top of the stack, but c'est la vie.  */
+#define FRAME_ARGS_ADDRESS(fi) \
+ (((fi)->next_frame                                  \
+   ? read_memory_integer ((fi)->next_frame + 8, 4)   \
+   : read_register (AP_REGNUM) /* 0 */))
+
+#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 = (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1)); }
+
+/* Return number of bytes at start of arglist that are not really args.  */
+
+#define FRAME_ARGS_SKIP 4
+
+/* 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.  */
+
+#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
+{ register int regnum;     \
+  register int regmask = read_memory_integer ((frame_info)->frame+4, 4) >> 16; \
+  register CORE_ADDR next_addr;     \
+  bzero (&frame_saved_regs, sizeof frame_saved_regs);     \
+  next_addr = (frame_info)->frame + 16;     \
+  /* Regmask's low bit is for register 0,     \
+     which is the first one that would be pushed.  */     \
+  for (regnum = 0; regnum < 12; regnum++, regmask >>= 1)  \
+    (frame_saved_regs).regs[regnum] = (regmask & 1) ? (next_addr += 4) : 0;  \
+  (frame_saved_regs).regs[SP_REGNUM] = next_addr + 4;  \
+  if (read_memory_integer ((frame_info)->frame + 4, 4) & 0x20000000)   \
+    (frame_saved_regs).regs[SP_REGNUM] += 4 + 4 * read_memory_integer (next_addr + 4, 4);  \
+  (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 16;  \
+  (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 12;  \
+  (frame_saved_regs).regs[AP_REGNUM] = (frame_info)->frame + 8;  \
+  (frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4;  \
+}
+
+/* Things needed for making the inferior call functions.  */
+
+/* Push an empty stack frame, to record the current PC, etc.  */
+
+#define PUSH_DUMMY_FRAME \
+{ register CORE_ADDR sp = read_register (SP_REGNUM);\
+  register int regnum;				    \
+  sp = push_word (sp, 0); /* arglist */		    \
+  for (regnum = 11; regnum >= 0; regnum--)	    \
+    sp = push_word (sp, read_register (regnum));    \
+  sp = push_word (sp, read_register (PC_REGNUM));   \
+  sp = push_word (sp, read_register (FP_REGNUM));   \
+  sp = push_word (sp, read_register (AP_REGNUM));   \
+  sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef)   \
+		      + 0x2fff0000);		    \
+  sp = push_word (sp, 0); 			    \
+  write_register (SP_REGNUM, sp);		    \
+  write_register (FP_REGNUM, sp);		    \
+  write_register (AP_REGNUM, sp + 17 * sizeof (int)); }
+
+/* Discard from the stack the innermost frame, restoring all registers.  */
+
+#define POP_FRAME  \
+{ register CORE_ADDR fp = read_register (FP_REGNUM);		 \
+  register int regnum;						 \
+  register int regmask = read_memory_integer (fp + 4, 4);	 \
+  write_register (PS_REGNUM, 					 \
+		  (regmask & 0xffff)				 \
+		  | (read_register (PS_REGNUM) & 0xffff0000));	 \
+  write_register (PC_REGNUM, read_memory_integer (fp + 16, 4));  \
+  write_register (FP_REGNUM, read_memory_integer (fp + 12, 4));  \
+  write_register (AP_REGNUM, read_memory_integer (fp + 8, 4));   \
+  fp += 16;							 \
+  for (regnum = 0; regnum < 12; regnum++)			 \
+    if (regmask & (0x10000 << regnum))				 \
+      write_register (regnum, read_memory_integer (fp += 4, 4)); \
+  fp = fp + 4 + ((regmask >> 30) & 3);				 \
+  if (regmask & 0x20000000)					 \
+    { regnum = read_memory_integer (fp, 4);			 \
+      fp += (regnum + 1) * 4; }					 \
+  write_register (SP_REGNUM, fp);				 \
+  flush_cached_frames ();					 \
+  set_current_frame (create_new_frame (read_register (FP_REGNUM),\
+					read_pc ())); }
+
+/* This sequence of words is the instructions
+     calls #69, @#32323232
+     bpt
+   Note this is 8 bytes.  */
+
+#define CALL_DUMMY {0x329f69fb, 0x03323232}
+
+#define CALL_DUMMY_START_OFFSET 0  /* Start execution at beginning of dummy */
+
+/* Insert the specified number of args and function address
+   into a call sequence of the above form stored at DUMMYNAME.  */
+
+#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p)   \
+{ *((char *) dummyname + 1) = nargs;		\
+  *(int *)((char *) dummyname + 3) = fun; }