mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-27 03:51:15 +08:00
310 lines
10 KiB
C
310 lines
10 KiB
C
/* Definitions to make GDB target for a tahoe running 4.3-Reno.
|
|
Copyright 1986, 1987, 1989, 1991, 1992, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
/*
|
|
* Ported by the State University of New York at Buffalo by the Distributed
|
|
* Computer Systems Lab, Department of Computer Science, 1991.
|
|
*/
|
|
|
|
#define TARGET_BYTE_ORDER BIG_ENDIAN
|
|
#define BITS_BIG_ENDIAN 0
|
|
|
|
/* 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 == 0x13) pc += 3; /* skip brw */ \
|
|
if (op == 0x2c && \
|
|
((unsigned char) read_memory_integer (pc+2, 1)) == 0x5e) \
|
|
pc += 3; /* skip subl2 */ \
|
|
if (op == 0xe9 && \
|
|
((unsigned char) read_memory_integer (pc+1, 1)) == 0xae && \
|
|
((unsigned char) read_memory_integer(pc+3, 1)) == 0x5e) \
|
|
pc += 4; /* skip movab */ \
|
|
if (op == 0xe9 && \
|
|
((unsigned char) read_memory_integer (pc+1, 1)) == 0xce && \
|
|
((unsigned char) read_memory_integer(pc+4, 1)) == 0x5e) \
|
|
pc += 5; /* skip movab */ \
|
|
if (op == 0xe9 && \
|
|
((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)
|
|
|
|
/* Wrong for cross-debugging. I don't know the real values. */
|
|
#include <machine/param.h>
|
|
#define TARGET_UPAGES UPAGES
|
|
#define TARGET_NBPG NBPG
|
|
|
|
/* Address of end of stack space. */
|
|
|
|
#define STACK_END_ADDR (0xc0000000 - (TARGET_UPAGES * TARGET_NBPG))
|
|
|
|
/* On BSD, sigtramp is in the u area. Can't check the exact
|
|
addresses because for cross-debugging we don't have target include
|
|
files around. This should be close enough. */
|
|
#define IN_SIGTRAMP(pc, name) ((pc) >= STACK_END_ADDR && (pc < 0xc0000000))
|
|
|
|
/* Stack grows downward. */
|
|
|
|
#define INNER_THAN <
|
|
|
|
/* Sequence of bytes for breakpoint instruction. */
|
|
|
|
#define BREAKPOINT {0x30}
|
|
|
|
/* 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) == 0x40)
|
|
|
|
/* Return 1 if P points to an invalid floating point value.
|
|
LEN is the length in bytes -- not relevant on the Tahoe. */
|
|
|
|
#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 19
|
|
|
|
/* 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", "fp", "sp", "pc", "ps", "al", "ah"}
|
|
|
|
#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 */
|
|
|
|
#define AL_REGNUM 17 /* Contains accumulator */
|
|
#define AH_REGNUM 18
|
|
|
|
/* Total amount of space needed to store our copies of the machine's
|
|
register state, the array `registers'. */
|
|
|
|
#define REGISTER_BYTES (19*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 tahoe, 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 tahoe, 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. */
|
|
|
|
/* In the case of the Tahoe, the frame's nominal address is the FP value,
|
|
and it points to the old FP */
|
|
|
|
#define FRAME_CHAIN(thisframe) \
|
|
(!inside_entry_file ((thisframe)->pc) ? \
|
|
read_memory_integer ((thisframe)->frame, 4) :\
|
|
0)
|
|
|
|
/* Define other aspects of the stack frame. */
|
|
|
|
/* Saved PC */
|
|
|
|
#define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame - 8, 4))
|
|
|
|
/* In most of GDB, getting the args address is too important to
|
|
just say "I don't know". */
|
|
|
|
#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
|
|
|
|
/* Address to use as an anchor for finding local variables */
|
|
|
|
#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 = ((0xffff & read_memory_integer(((fi)->frame-4),4)) - 4) >> 2; }
|
|
|
|
/* 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. */
|
|
|
|
#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
|
|
{ register int regnum; \
|
|
register int rmask = 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 - 8; \
|
|
for (regnum = 12; regnum >= 0; regnum--, rmask <<= 1) \
|
|
(frame_saved_regs).regs[regnum] = (rmask & 0x1000) ? (next_addr -= 4) : 0;\
|
|
(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4; \
|
|
(frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame - 8; \
|
|
(frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
|
|
}
|
|
|
|
/* 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; \
|
|
printf("PUSH_DUMMY_FRAME\n"); \
|
|
sp = push_word (sp, read_register (FP_REGNUM)); \
|
|
write_register (FP_REGNUM, sp); \
|
|
sp = push_word (sp, 0x1fff0004); /*SAVE MASK*/ \
|
|
sp = push_word (sp, read_register (PC_REGNUM)); \
|
|
for (regnum = 12; regnum >= 0; 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 CORE_ADDR fp = read_register (FP_REGNUM); \
|
|
register int regnum; \
|
|
register int regmask = read_memory_integer (fp-4, 4); \
|
|
printf("POP_FRAME\n"); \
|
|
regmask >>= 16; \
|
|
write_register (SP_REGNUM, fp+4); \
|
|
write_register (PC_REGNUM, read_memory_integer(fp-8, 4)); \
|
|
write_register (FP_REGNUM, read_memory_integer(fp, 4)); \
|
|
fp -= 8; \
|
|
for (regnum = 12; regnum >= 0; regnum--, regmask <<= 1) \
|
|
if (regmask & 0x1000) \
|
|
write_register (regnum, read_memory_integer (fp-=4, 4)); \
|
|
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 {0xbf699f32, 0x32323230}
|
|
|
|
/* Start execution at beginning of dummy */
|
|
|
|
#define CALL_DUMMY_START_OFFSET 0
|
|
|
|
/* 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, valtype, using_gcc) \
|
|
{ int temp = (int) fun; \
|
|
*((char *) dummyname + 1) = nargs; \
|
|
bcopy(&temp,(char *)dummyname+3,4); }
|
|
|