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+/* Definitions to target GDB to a merlin under utek 2.1
+ Copyright 1986, 1987, 1989, 1991, 1993 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. */
+
+#define TARGET_BYTE_ORDER LITTLE_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. */
+
+#define SKIP_PROLOGUE(pc) \
+{ register int op = read_memory_integer (pc, 1); \
+ if (op == 0x82) \
+ { op = read_memory_integer (pc+2,1); \
+ if ((op & 0x80) == 0) pc += 3; \
+ else if ((op & 0xc0) == 0x80) pc += 4; \
+ else pc += 6; \
+ }}
+
+/* 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_memory_integer (read_register (SP_REGNUM), 4)
+
+/* Address of end of stack space. */
+
+#define STACK_END_ADDR (0x800000)
+
+/* Stack grows downward. */
+
+#define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
+
+/* Sequence of bytes for breakpoint instruction. */
+
+#define BREAKPOINT {0xf2}
+
+/* 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
+
+/* Define this to say that the "svc" insn is followed by
+ codes in memory saying which kind of system call it is. */
+
+#define NS32K_SVC_IMMED_OPERANDS
+
+/* 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
+
+/* Number of machine registers */
+
+#define NUM_REGS 25
+
+#define NUM_GENERAL_REGS 8
+
+/* 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", \
+ "pc", "sp", "fp", "ps", \
+ "fsr", \
+ "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
+ "l0", "l1", "l2", "l3", "l4", \
+ }
+
+/* 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 FP_REGNUM
+#define FP_REGNUM 10 /* Contains address of executing stack frame */
+#define SP_REGNUM 9 /* Contains address of top of stack */
+#define PC_REGNUM 8 /* Contains program counter */
+#define PS_REGNUM 11 /* Contains processor status */
+#define FPS_REGNUM 12 /* Floating point status register */
+#define FP0_REGNUM 13 /* Floating point register 0 */
+#define LP0_REGNUM 21 /* Double register 0 (same as FP0) */
+
+/* Total amount of space needed to store our copies of the machine's
+ register state, the array `registers'. */
+#define REGISTER_BYTES ((NUM_REGS - 4) * sizeof (int) + 4 * sizeof (double))
+
+/* Index within `registers' of the first byte of the space for
+ register N. */
+
+#define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \
+ LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4)
+
+/* Number of bytes of storage in the actual machine representation
+ for register N. On the 32000, all regs are 4 bytes
+ except for the doubled floating registers. */
+
+#define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
+
+/* Number of bytes of storage in the program's representation
+ for register N. On the 32000, all regs are 4 bytes
+ except for the doubled floating registers. */
+
+#define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4)
+
+/* Largest value REGISTER_RAW_SIZE can have. */
+
+#define MAX_REGISTER_RAW_SIZE 8
+
+/* Largest value REGISTER_VIRTUAL_SIZE can have. */
+
+#define MAX_REGISTER_VIRTUAL_SIZE 8
+
+/* Return the GDB type object for the "standard" data type
+ of data in register N. */
+
+#define REGISTER_VIRTUAL_TYPE(N) \
+ ((N) >= FP0_REGNUM ? \
+ ((N) >= LP0_REGNUM ? \
+ builtin_type_double \
+ : builtin_type_float) \
+ : 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.
+
+ On this machine this is a no-op, as gcc doesn't run on it yet.
+ This calling convention is not used. */
+
+#define STORE_STRUCT_RETURN(ADDR, SP)
+
+/* 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) \
+ memcpy (VALBUF, REGBUF, 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. */
+
+/* In the case of the Merlin, the frame's nominal address is the FP value,
+ and at that address is saved previous FP value as a 4-byte word. */
+
+#define FRAME_CHAIN(thisframe) \
+ (!inside_entry_file ((thisframe)->pc) ? \
+ read_memory_integer ((thisframe)->frame, 4) :\
+ 0)
+
+/* Define other aspects of the stack frame. */
+
+#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4))
+
+/* compute base of arguments */
+#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) \
+{ CORE_ADDR pc; \
+ int insn; \
+ int addr_mode; \
+ int width; \
+ \
+ pc = FRAME_SAVED_PC (fi); \
+ insn = read_memory_integer (pc,2); \
+ addr_mode = (insn >> 11) & 0x1f; \
+ insn = insn & 0x7ff; \
+ if ((insn & 0x7fc) == 0x57c \
+ && addr_mode == 0x14) /* immediate */ \
+ { if (insn == 0x57c) /* adjspb */ \
+ width = 1; \
+ else if (insn == 0x57d) /* adjspw */ \
+ width = 2; \
+ else if (insn == 0x57f) /* adjspd */ \
+ width = 4; \
+ numargs = read_memory_integer (pc+2,width); \
+ if (width > 1) \
+ flip_bytes (&numargs, width); \
+ numargs = - sign_extend (numargs, width*8) / 4; } \
+ else numargs = -1; \
+}
+
+/* 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. */
+
+#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
+{ int regmask,regnum; \
+ int localcount; \
+ CORE_ADDR enter_addr; \
+ CORE_ADDR next_addr; \
+ \
+ enter_addr = get_pc_function_start ((frame_info)->pc); \
+ regmask = read_memory_integer (enter_addr+1, 1); \
+ localcount = ns32k_localcount (enter_addr); \
+ next_addr = (frame_info)->frame + localcount; \
+ for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) \
+ (frame_saved_regs).regs[regnum] \
+ = (regmask & 1) ? (next_addr -= 4) : 0; \
+ (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4; \
+ (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \
+ (frame_saved_regs).regs[FP_REGNUM] \
+ = read_memory_integer ((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, read_register (PC_REGNUM)); \
+ sp = push_word (sp, read_register (FP_REGNUM)); \
+ write_register (FP_REGNUM, sp); \
+ for (regnum = 0; regnum < 8; regnum++) \
+ sp = push_word (sp, read_register (regnum)); \
+ write_register (SP_REGNUM, sp); \
+}
+
+/* Discard from the stack the innermost frame, restoring all registers. */
+
+#define POP_FRAME \
+{ register struct frame_info *frame = get_current_frame (); \
+ register CORE_ADDR fp; \
+ register int regnum; \
+ struct frame_saved_regs fsr; \
+ struct frame_info *fi; \
+ fp = frame->frame; \
+ get_frame_saved_regs (frame, &fsr); \
+ for (regnum = 0; regnum < 8; regnum++) \
+ if (fsr.regs[regnum]) \
+ write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
+ write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
+ write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \
+ write_register (SP_REGNUM, fp + 8); \
+ flush_cached_frames (); \
+}
+
+/* This sequence of words is the instructions
+ enter 0xff,0 82 ff 00
+ jsr @0x00010203 7f ae c0 01 02 03
+ adjspd 0x69696969 7f a5 01 02 03 04
+ bpt f2
+ Note this is 16 bytes. */
+
+#define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 }
+
+#define CALL_DUMMY_START_OFFSET 3
+#define CALL_DUMMY_LENGTH 16
+#define CALL_DUMMY_ADDR 5
+#define CALL_DUMMY_NARGS 11
+
+/* 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) \
+{ int flipped = fun | 0xc0000000; \
+ flip_bytes (&flipped, 4); \
+ *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \
+ flipped = - nargs * 4; \
+ flip_bytes (&flipped, 4); \
+ *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \
+}
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