525 lines
20 KiB
C
525 lines
20 KiB
C
/*
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Date: Thu, 2 Apr 87 00:02:42 EST
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From: crl@maxwell.physics.purdue.edu (Charles R. LaBrec)
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Message-Id: <8704020502.AA01744@maxwell.physics.purdue.edu>
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To: bug-gdb@prep.ai.mit.edu
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Subject: gdb for ISI Optimum V
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Here is an m-isi-ov.h file for gdb version 2.1. It supports the 68881
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registers, and tracks down the function prologue (since the ISI cc
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puts it at the end of the function and branches to it if not
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optimizing). Also included are diffs to core.c, findvar.c, and
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inflow.c, since the original code assumed that registers are an int in
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the user struct, which isn't the case for 68020's with 68881's (and
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not using the NEW_SUN_PTRACE). I have not fixed the bugs associated
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with the other direction (writing registers back to the user struct).
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I have also included a diff that turns m68k-pinsn.c into isi-pinsn.c,
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which is needed since the 3.05 release of as does not understand
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floating point ops, and it compiles incorrectly under "cc -20"
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I have used gdb for a while now, and it seems to work relatively well,
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but I do not guarantee that it is perfect. The more that use it, the
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faster the bugs will get shaken out. One bug I know of is not in gdb,
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but in the assembler. It seems to screw up the .stabs of variables.
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For externs, this is not important since gdb uses the global symbol
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value, but for statics, this makes gdb unable to find them. I am
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currently trying to track it down.
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As an aside, I notice that only global functions are used as symbols
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to print as relative addresses, i.e. "<function + offset>", and not
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static functions, which end up printing as large offsets from the last
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global one. Would there be a problem if static functions were also
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recorded as misc functions in read_dbx_symtab?
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Charles LaBrec
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crl @ maxwell.physics.purdue.edu
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Definitions to make GDB run on a ISI Optimum V (3.05) under 4.2bsd.
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Copyright (C) 1987 Free Software Foundation, Inc.
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GDB is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY. No author or distributor accepts responsibility to anyone
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for the consequences of using it or for whether it serves any
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particular purpose or works at all, unless he says so in writing.
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Refer to the GDB General Public License for full details.
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Everyone is granted permission to copy, modify and redistribute GDB,
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but only under the conditions described in the GDB General Public
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License. A copy of this license is supposed to have been given to you
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along with GDB so you can know your rights and responsibilities. It
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should be in a file named COPYING. Among other things, the copyright
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notice and this notice must be preserved on all copies.
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In other words, go ahead and share GDB, but don't try to stop
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anyone else from sharing it farther. Help stamp out software hoarding!
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*/
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/* Identify this machine */
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#ifndef ISI68K
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#define ISI68K
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#endif
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/* Define this if the C compiler puts an underscore at the front
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of external names before giving them to the linker. */
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#define NAMES_HAVE_UNDERSCORE
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/* Debugger information will be in DBX format. */
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#define READ_DBX_FORMAT
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/* Offset from address of function to start of its code.
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Zero on most machines. */
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#define FUNCTION_START_OFFSET 0
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/* Advance PC across any function entry prologue instructions
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to reach some "real" code. */
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#define SKIP_PROLOGUE(pc) \
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{ register int op = read_memory_integer (pc, 2); \
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if (op == 0047126) \
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pc += 4; /* Skip link #word */ \
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else if (op == 0044016) \
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pc += 6; /* Skip link #long */ \
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else if (op == 0060000) \
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pc += 4; /* Skip bra #word */ \
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else if (op == 00600377) \
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pc += 6; /* skip bra #long */ \
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else if ((op & 0177400) == 0060000) \
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pc += 2; /* skip bra #char */ \
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}
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/* Immediately after a function call, return the saved pc.
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Can't always go through the frames for this because on some machines
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the new frame is not set up until the new function executes
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some instructions. */
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#define SAVED_PC_AFTER_CALL(frame) \
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read_memory_integer (read_register (SP_REGNUM), 4)
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/* This is the amount to subtract from u.u_ar0
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to get the offset in the core file of the register values. */
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#define KERNEL_U_ADDR 0x10800000
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/* Address of end of stack space. */
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#define STACK_END_ADDR 0x10000000
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/* Stack grows downward. */
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#define INNER_THAN <
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/* Sequence of bytes for breakpoint instruction. */
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#define BREAKPOINT {0x4e, 0x4f}
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/* Data segment starts at etext rounded up to DATAROUND in {N,Z}MAGIC files */
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#define DATAROUND 0x20000
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#define N_DATADDR(hdr) (hdr.a_magic != OMAGIC ? \
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(hdr.a_text + DATAROUND) & ~(DATAROUND-1) : hdr.a_text)
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/* Text segment starts at sizeof (struct exec) in {N,Z}MAGIC files */
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#define N_TXTADDR(hdr) (hdr.a_magic != OMAGIC ? sizeof (struct exec) : 0)
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/* Amount PC must be decremented by after a breakpoint.
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This is often the number of bytes in BREAKPOINT
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but not always.
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On the ISI, the kernel resets the pc to the trap instr */
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#define DECR_PC_AFTER_BREAK 0
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/* Nonzero if instruction at PC is a return instruction. */
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#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 2) == 0x4e76)
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/* Return 1 if P points to an invalid floating point value. */
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#define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
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/* Say how long registers are. */
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#define REGISTER_TYPE long
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/* Number of machine registers */
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#define NUM_REGS 29
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/* Initializer for an array of names of registers.
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There should be NUM_REGS strings in this initializer. */
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#define REGISTER_NAMES \
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{"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \
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"a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \
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"ps", "pc", \
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"fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \
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"fpcontrol", "fpstatus", "fpiaddr" }
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/* Register numbers of various important registers.
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Note that some of these values are "real" register numbers,
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and correspond to the general registers of the machine,
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and some are "phony" register numbers which are too large
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to be actual register numbers as far as the user is concerned
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but do serve to get the desired values when passed to read_register. */
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#define FP_REGNUM 14 /* Contains address of executing stack frame */
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#define SP_REGNUM 15 /* Contains address of top of stack */
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#define PS_REGNUM 16 /* Contains processor status */
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#define PC_REGNUM 17 /* Contains program counter */
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#define FP0_REGNUM 18 /* Floating point register 0 */
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#define FPC_REGNUM 26 /* 68881 control register */
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#define REGISTER_U_ADDR(addr, blockend, regno) \
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{ if (regno < 2) addr = blockend - 0x18 + regno * 4; \
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else if (regno < 8) addr = blockend - 0x54 + regno * 4; \
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else if (regno < 10) addr = blockend - 0x30 + regno * 4;\
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else if (regno < 15) addr = blockend - 0x5c + regno * 4;\
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else if (regno < 16) addr = blockend - 0x1c; \
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else if (regno < 18) addr = blockend - 0x44 + regno * 4;\
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else if (regno < 26) addr = (int) ((struct user *)0)->u_68881_regs \
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+ (regno - 18) * 12; \
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else if (regno < 29) addr = (int) ((struct user *)0)->u_68881_regs \
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+ 8 * 12 + (regno - 26) * 4; \
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}
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/* Total amount of space needed to store our copies of the machine's
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register state, the array `registers'. */
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#define REGISTER_BYTES (16*4+8*12+8+20)
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/* Index within `registers' of the first byte of the space for
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register N. */
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#define REGISTER_BYTE(N) \
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((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168 \
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: (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72 \
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: (N) * 4)
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/* Number of bytes of storage in the actual machine representation
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for register N. On the 68000, all regs are 4 bytes
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except the floating point regs which are 12 bytes. */
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#define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4)
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/* Number of bytes of storage in the program's representation
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for register N. On the 68000, all regs are 4 bytes
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except the floating point regs which are 8-byte doubles. */
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#define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4)
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/* Largest value REGISTER_RAW_SIZE can have. */
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#define MAX_REGISTER_RAW_SIZE 12
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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE 8
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/* Nonzero if register N requires conversion
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from raw format to virtual format. */
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#define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8)
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/* Convert data from raw format for register REGNUM
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to virtual format for register REGNUM. */
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#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
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{ if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \
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convert_from_68881 ((FROM), (TO)); \
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else \
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bcopy ((FROM), (TO), 4); }
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/* Convert data from virtual format for register REGNUM
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to raw format for register REGNUM. */
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#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
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{ if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \
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convert_to_68881 ((FROM), (TO)); \
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else \
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bcopy ((FROM), (TO), 4); }
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/* Return the GDB type object for the "standard" data type
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of data in register N. */
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#define REGISTER_VIRTUAL_TYPE(N) \
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(((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double : builtin_type_int)
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/* Extract from an array REGBUF containing the (raw) register state
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a function return value of type TYPE, and copy that, in virtual format,
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into VALBUF. */
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
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/* Write into appropriate registers a function return value
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of type TYPE, given in virtual format. */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
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/* Extract from an array REGBUF containing the (raw) register state
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the address in which a function should return its structure value,
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as a CORE_ADDR (or an expression that can be used as one). */
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#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
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/* Describe the pointer in each stack frame to the previous stack frame
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(its caller). */
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/* FRAME_CHAIN takes a frame's nominal address
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and produces the frame's chain-pointer.
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FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
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and produces the nominal address of the caller frame.
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However, if FRAME_CHAIN_VALID returns zero,
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it means the given frame is the outermost one and has no caller.
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In that case, FRAME_CHAIN_COMBINE is not used. */
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/* In the case of the ISI, the frame's nominal address
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is the address of a 4-byte word containing the calling frame's address. */
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#define FRAME_CHAIN(thisframe) (read_memory_integer (thisframe, 4))
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#define FRAME_CHAIN_VALID(chain, thisframe) \
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(chain != 0 && (FRAME_SAVED_PC (thisframe) >= first_object_file_end))
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#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
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/* Define other aspects of the stack frame. */
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#define FRAME_SAVED_PC(frame) (read_memory_integer (frame + 4, 4))
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#define FRAME_ARGS_ADDRESS(fi) (fi.frame)
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#define FRAME_LOCALS_ADDRESS(fi) (fi.frame)
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/* Return number of args passed to a frame.
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Can return -1, meaning no way to tell. */
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#define FRAME_NUM_ARGS(val, fi) \
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{ register CORE_ADDR pc = FRAME_SAVED_PC (fi.frame); \
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register int insn = 0177777 & read_memory_integer (pc, 2); \
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val = 0; \
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if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ \
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val = read_memory_integer (pc + 2, 2); \
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else if ((insn & 0170777) == 0050217 /* addql #N, sp */ \
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|| (insn & 0170777) == 0050117) /* addqw */ \
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{ val = (insn >> 9) & 7; if (val == 0) val = 8; } \
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else if (insn == 0157774) /* addal #WW, sp */ \
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val = read_memory_integer (pc + 2, 4); \
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val >>= 2; }
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/* Return number of bytes at start of arglist that are not really args. */
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#define FRAME_ARGS_SKIP 8
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/* Put here the code to store, into a struct frame_saved_regs,
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the addresses of the saved registers of frame described by FRAME_INFO.
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This includes special registers such as pc and fp saved in special
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ways in the stack frame. sp is even more special:
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the address we return for it IS the sp for the next frame. */
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#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
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{ register int regnum; \
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register int regmask; \
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register CORE_ADDR next_addr; \
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register CORE_ADDR pc; \
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register int insn; \
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register int offset; \
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bzero (&frame_saved_regs, sizeof frame_saved_regs); \
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if ((frame_info).pc >= (frame_info).frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \
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&& (frame_info).pc <= (frame_info).frame) \
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{ next_addr = (frame_info).frame; \
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pc = (frame_info).frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\
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else \
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{ pc = get_pc_function_start ((frame_info).pc); \
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/* Verify we have a link a6 instruction next, \
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or a branch followed by a link a6 instruction; \
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if not we lose. If we win, find the address above the saved \
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regs using the amount of storage from the link instruction. */\
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retry: \
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insn = read_memory_integer (pc, 2); \
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if (insn == 044016) \
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next_addr = (frame_info).frame - read_memory_integer (pc += 2, 4), pc+=4; \
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else if (insn == 047126) \
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next_addr = (frame_info).frame - read_memory_integer (pc += 2, 2), pc+=2; \
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else if ((insn & 0177400) == 060000) /* bra insn */ \
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{ offset = insn & 0377; \
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pc += 2; /* advance past bra */ \
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if (offset == 0) /* bra #word */ \
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offset = read_memory_integer (pc, 2), pc += 2; \
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else if (offset == 0377) /* bra #long */ \
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offset = read_memory_integer (pc, 4), pc += 4; \
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pc += offset; \
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goto retry; \
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} else goto lose; \
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/* If have an addal #-n, sp next, adjust next_addr. */ \
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if ((0177777 & read_memory_integer (pc, 2)) == 0157774) \
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next_addr += read_memory_integer (pc += 2, 4), pc += 4; \
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} \
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/* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \
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insn = read_memory_integer (pc, 2), pc += 2; \
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regmask = read_memory_integer (pc, 2); \
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if ((insn & 0177760) == 022700) /* movl rn, (sp) */ \
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(frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr; \
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else if ((insn & 0177760) == 024700) /* movl rn, -(sp) */ \
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(frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr-=4; \
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else if (insn == 0044327) /* moveml mask, (sp) */ \
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{ pc += 2; \
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/* Regmask's low bit is for register 0, the first written */ \
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next_addr -= 4; \
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for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \
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if (regmask & 1) \
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(frame_saved_regs).regs[regnum] = (next_addr += 4); \
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} else if (insn == 0044347) /* moveml mask, -(sp) */ \
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{ pc += 2; \
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/* Regmask's low bit is for register 15, the first pushed */ \
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for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \
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if (regmask & 1) \
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(frame_saved_regs).regs[regnum] = (next_addr -= 4); } \
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/* clrw -(sp); movw ccr,-(sp) may follow. */ \
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if (read_memory_integer (pc, 2) == 041147 \
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&& read_memory_integer (pc+2, 2) == 042347) \
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(frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \
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lose: ; \
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(frame_saved_regs).regs[SP_REGNUM] = (frame_info).frame + 8; \
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(frame_saved_regs).regs[FP_REGNUM] = (frame_info).frame; \
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(frame_saved_regs).regs[PC_REGNUM] = (frame_info).frame + 4; \
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}
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/* Things needed for making the inferior call functions. */
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/* Push an empty stack frame, to record the current PC, etc. */
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#define PUSH_DUMMY_FRAME \
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{ register CORE_ADDR sp = read_register (SP_REGNUM); \
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register int regnum; \
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char raw_buffer[12]; \
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sp = push_word (sp, read_register (PC_REGNUM)); \
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sp = push_word (sp, read_register (FP_REGNUM)); \
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write_register (FP_REGNUM, sp); \
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for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \
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{ read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); \
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sp = push_bytes (sp, raw_buffer, 12); } \
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for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \
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sp = push_word (sp, read_register (regnum)); \
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sp = push_word (sp, read_register (PS_REGNUM)); \
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write_register (SP_REGNUM, sp); }
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/* Discard from the stack the innermost frame, restoring all registers. */
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#define POP_FRAME \
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{ register CORE_ADDR fp = read_register (FP_REGNUM); \
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register int regnum; \
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struct frame_saved_regs fsr; \
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struct frame_info fi; \
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char raw_buffer[12]; \
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fi = get_frame_info (fp); \
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get_frame_saved_regs (&fi, &fsr); \
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for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \
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if (fsr.regs[regnum]) \
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{ read_memory (fsr.regs[regnum], raw_buffer, 12); \
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write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\
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for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \
|
||
if (fsr.regs[regnum]) \
|
||
write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
|
||
if (fsr.regs[PS_REGNUM]) \
|
||
write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_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); \
|
||
}
|
||
|
||
/* This sequence of words is the instructions
|
||
fmovem #<f0-f7>,-(sp)
|
||
moveml 0xfffc,-(sp)
|
||
clrw -(sp)
|
||
movew ccr,-(sp)
|
||
/..* The arguments are pushed at this point by GDB;
|
||
no code is needed in the dummy for this.
|
||
The CALL_DUMMY_START_OFFSET gives the position of
|
||
the following jsr instruction. *../
|
||
jsr @#32323232
|
||
addl #69696969,sp
|
||
bpt
|
||
nop
|
||
Note this is 24 bytes.
|
||
We actually start executing at the jsr, since the pushing of the
|
||
registers is done by PUSH_DUMMY_FRAME. If this were real code,
|
||
the arguments for the function called by the jsr would be pushed
|
||
between the moveml and the jsr, and we could allow it to execute through.
|
||
But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
|
||
and we cannot allow the moveml to push the registers again lest they be
|
||
taken for the arguments. */
|
||
|
||
#define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4f4e71}
|
||
|
||
#define CALL_DUMMY_LENGTH 28
|
||
|
||
#define CALL_DUMMY_START_OFFSET 12
|
||
|
||
/* 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, fun, nargs) \
|
||
{ *(int *)((char *) dummyname + 20) = nargs * 4; \
|
||
*(int *)((char *) dummyname + 14) = fun; }
|
||
|
||
/* Interface definitions for kernel debugger KDB. */
|
||
|
||
/* Map machine fault codes into signal numbers.
|
||
First subtract 0, divide by 4, then index in a table.
|
||
Faults for which the entry in this table is 0
|
||
are not handled by KDB; the program's own trap handler
|
||
gets to handle then. */
|
||
|
||
#define FAULT_CODE_ORIGIN 0
|
||
#define FAULT_CODE_UNITS 4
|
||
#define FAULT_TABLE \
|
||
{ 0, 0, 0, 0, SIGTRAP, 0, 0, 0, \
|
||
0, SIGTRAP, 0, 0, 0, 0, 0, SIGKILL, \
|
||
0, 0, 0, 0, 0, 0, 0, 0, \
|
||
SIGILL }
|
||
|
||
/* Start running with a stack stretching from BEG to END.
|
||
BEG and END should be symbols meaningful to the assembler.
|
||
This is used only for kdb. */
|
||
|
||
#define INIT_STACK(beg, end) \
|
||
{ asm (".globl end"); \
|
||
asm ("movl $ end, sp"); \
|
||
asm ("clrl fp"); }
|
||
|
||
/* Push the frame pointer register on the stack. */
|
||
#define PUSH_FRAME_PTR \
|
||
asm ("movel fp, -(sp)");
|
||
|
||
/* Copy the top-of-stack to the frame pointer register. */
|
||
#define POP_FRAME_PTR \
|
||
asm ("movl (sp), fp");
|
||
|
||
/* After KDB is entered by a fault, push all registers
|
||
that GDB thinks about (all NUM_REGS of them),
|
||
so that they appear in order of ascending GDB register number.
|
||
The fault code will be on the stack beyond the last register. */
|
||
|
||
#define PUSH_REGISTERS \
|
||
{ asm ("clrw -(sp)"); \
|
||
asm ("pea 10(sp)"); \
|
||
asm ("movem $ 0xfffe,-(sp)"); }
|
||
|
||
/* Assuming the registers (including processor status) have been
|
||
pushed on the stack in order of ascending GDB register number,
|
||
restore them and return to the address in the saved PC register. */
|
||
|
||
#define POP_REGISTERS \
|
||
{ asm ("subil $8,28(sp)"); \
|
||
asm ("movem (sp),$ 0xffff"); \
|
||
asm ("rte"); }
|