286 lines
9.9 KiB
C
286 lines
9.9 KiB
C
/* 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. */
|
||
|
||
extern CORE_ADDR merlin_skip_prologue (CORE_ADDR);
|
||
#define SKIP_PROLOGUE(pc) (merlin_skip_prologue (pc))
|
||
|
||
/* 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. */
|
||
|
||
extern int merlin_frame_num_args (struct frame_info *fi);
|
||
#define FRAME_NUM_ARGS(fi) (merlin_frame_num_args ((fi)))
|
||
|
||
/* 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; \
|
||
}
|