478 lines
15 KiB
C
478 lines
15 KiB
C
/* Copyright (C) 1986, 1987, 1988, 1989, 1990 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. */
|
||
|
||
/* g++ support is not yet included. */
|
||
|
||
#include "tdesc.h"
|
||
|
||
|
||
#define TARGET_BYTE_ORDER BIG_ENDIAN
|
||
|
||
#define EXTRA_SYMTAB_INFO int coffsem;
|
||
|
||
/* 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 dc_handle_t tdesc_handle; \
|
||
\
|
||
safe_to_init_tdesc_context = 0; \
|
||
if (tdesc_handle) \
|
||
{ \
|
||
dc_terminate (tdesc_handle); \
|
||
tdesc_handle = 0; \
|
||
} \
|
||
}
|
||
|
||
dc_dcontext_t get_prev_context ();
|
||
extern int stack_error;
|
||
|
||
#define EXTRA_FRAME_INFO dc_dcontext_t frame_context;
|
||
#define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
|
||
{ \
|
||
if (fci->next_frame != NULL) \
|
||
{ \
|
||
extern jmp_buf stack_jmp; \
|
||
struct frame_info *next_frame = fci->next; \
|
||
/* The call to get_prev_context */ \
|
||
/* will update current_context for us. */ \
|
||
stack_error = 1; \
|
||
if (!setjmp (stack_jmp)) \
|
||
{ \
|
||
fci->frame_context \
|
||
= get_prev_context (next_frame->frame_context); \
|
||
stack_error = 0; \
|
||
} \
|
||
else \
|
||
{ \
|
||
stack_error = 0; \
|
||
next_frame->prev = 0; \
|
||
return 0; \
|
||
} \
|
||
if (!fci->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 (&(((char *)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
|
||
|
||
/* We provide our own get_saved_register in m88k-tdep.c. */
|
||
#define GET_SAVED_REGISTER
|
||
|
||
/* 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)
|
||
|
||
|
||
/* There is not currently a functioning way to call functions in the
|
||
inferior. */
|
||
|
||
/* But if there was this is where we'd put the call dummy. */
|
||
/* #define CALL_DUMMY_LOCATION AFTER_TEXT_END */
|
||
|
||
/* 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. */
|
||
#if !defined (BCS)
|
||
#define BCS 1
|
||
#endif
|
||
|
||
#define DELTA88
|