404 lines
14 KiB
C
404 lines
14 KiB
C
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/* Definitions to make GDB run on an Alpha box under OSF1.
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Copyright 1993 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "bfd.h"
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#include "coff/sym.h" /* Needed for PDR below. */
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#include "coff/symconst.h"
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#if !defined (TARGET_BYTE_ORDER)
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#define TARGET_BYTE_ORDER LITTLE_ENDIAN
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#endif
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/* Redefine some target bit sizes from the default. */
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#undef TARGET_LONG_BIT
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#define TARGET_LONG_BIT 64
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#undef TARGET_LONG_LONG_BIT
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#define TARGET_LONG_LONG_BIT 64
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#undef TARGET_PTR_BIT
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#define TARGET_PTR_BIT 64
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/* Floating point is IEEE compliant */
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#define IEEE_FLOAT
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/* Number of traps that happen between exec'ing the shell
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* to run an inferior, and when we finally get to
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* the inferior code. This is 2 on most implementations.
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*/
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#define START_INFERIOR_TRAPS_EXPECTED 3
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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) pc = alpha_skip_prologue(pc, 0)
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extern CORE_ADDR alpha_skip_prologue PARAMS ((CORE_ADDR addr, int lenient));
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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) alpha_saved_pc_after_call(frame)
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#ifdef __STDC__
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struct frame_info;
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#endif
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extern CORE_ADDR
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alpha_saved_pc_after_call PARAMS ((struct frame_info *));
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/* Are we currently handling a signal ? */
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#define IN_SIGTRAMP(pc, name) ((name) && STREQ ("__sigtramp", (name)))
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/* Stack grows downward. */
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#define INNER_THAN <
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#define BREAKPOINT {0x80, 0, 0, 0} /* call_pal bpt */
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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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#define DECR_PC_AFTER_BREAK 4
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/* Nonzero if instruction at PC is a return instruction.
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"ret $zero,($ra),1" on alpha. */
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#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x6bfa8001)
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/* Return 1 if P points to an invalid floating point value. */
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#define INVALID_FLOAT(p,l) 0
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/* Say how long (all) registers are.
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This is unused for the alpha, but the define is necessary. */
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#define REGISTER_TYPE long
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/* Number of machine registers */
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#define NUM_REGS 66
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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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{ "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6", \
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"t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp", \
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"a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9", \
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"t10", "t11", "ra", "t12", "at", "gp", "sp", "zero", \
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
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"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
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"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\
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"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",\
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"pc", "vfp", \
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}
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/* Register numbers of various important registers.
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Note that most 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 FP_REGNUM is a "phony" register number which is too large
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to be an actual register number as far as the user is concerned
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but serves to get the desired value when passed to read_register. */
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#define V0_REGNUM 0 /* Function integer return value */
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#define GCC_FP_REGNUM 15 /* Used by gcc as frame register */
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#define A0_REGNUM 16 /* Loc of first arg during a subr call */
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#define T12_REGNUM 27 /* Contains start addr of current proc */
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#define SP_REGNUM 30 /* Contains address of top of stack */
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#define RA_REGNUM 26 /* Contains return address value */
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#define ZERO_REGNUM 31 /* Read-only register, always 0 */
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#define FP0_REGNUM 32 /* Floating point register 0 */
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#define FPA0_REGNUM 48 /* First float arg during a subr call */
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#define PC_REGNUM 64 /* Contains program counter */
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#define FP_REGNUM 65 /* Virtual frame pointer */
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#define CANNOT_FETCH_REGISTER(regno) \
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((regno) == FP_REGNUM || (regno) == ZERO_REGNUM)
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#define CANNOT_STORE_REGISTER(regno) \
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((regno) == FP_REGNUM || (regno) == ZERO_REGNUM)
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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 (NUM_REGS * 8)
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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) ((N) * 8)
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/* Number of bytes of storage in the actual machine representation
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for register N. On Alphas, all regs are 8 bytes. */
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#define REGISTER_RAW_SIZE(N) 8
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/* Number of bytes of storage in the program's representation
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for register N. On Alphas, all regs are 8 bytes. */
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#define REGISTER_VIRTUAL_SIZE(N) 8
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/* Largest value REGISTER_RAW_SIZE can have. */
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#define MAX_REGISTER_RAW_SIZE 8
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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) 0
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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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memcpy ((TO), (FROM), 8);
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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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memcpy ((TO), (FROM), 8);
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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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(((N) >= FP0_REGNUM && (N) < FP0_REGNUM+32) \
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? builtin_type_double : builtin_type_long) \
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/* Store the address of the place in which to copy the structure the
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subroutine will return. Handled by alpha_push_arguments. */
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#define STORE_STRUCT_RETURN(addr, sp) /**/
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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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alpha_extract_return_value(TYPE, REGBUF, VALBUF)
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#ifdef __STDC__
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struct type;
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#endif
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extern void
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alpha_extract_return_value PARAMS ((struct type *, char *, char *));
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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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alpha_store_return_value(TYPE, VALBUF)
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extern void
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alpha_store_return_value PARAMS ((struct type *, char *));
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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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/* The address is passed in a0 upon entry to the function, but when
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the function exits, the compiler has copied the value to v0. This
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convention is specified by the System V ABI, so I think we can rely
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on it. */
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#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
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(extract_address (REGBUF + REGISTER_BYTE (V0_REGNUM), \
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REGISTER_RAW_SIZE (V0_REGNUM)))
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/* Structures are returned by ref in extra arg0 */
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#define USE_STRUCT_CONVENTION(gcc_p, type) 1
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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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#define FRAME_CHAIN(thisframe) (FRAME_ADDR)alpha_frame_chain(thisframe)
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extern CORE_ADDR
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alpha_frame_chain PARAMS ((struct frame_info *));
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/* Define other aspects of the stack frame. */
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/* A macro that tells us whether the function invocation represented
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by FI does not have a frame on the stack associated with it. If it
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does not, FRAMELESS is set to 1, else 0. */
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/* We handle this differently for alpha, and maybe we should not */
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#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) {(FRAMELESS) = 0;}
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/* Saved Pc. */
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#define FRAME_SAVED_PC(FRAME) (alpha_frame_saved_pc(FRAME))
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extern CORE_ADDR
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alpha_frame_saved_pc PARAMS ((struct frame_info *));
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/* The offsets for the arguments and locals are off a virtual pointer
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to the argument transfer area. The argument transfer area is immediately
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below the virtual frame pointer, its size is in localoff from the PDR. */
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#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame - (fi)->localoff)
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#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame - (fi)->localoff)
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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(num, fi) ((num) = -1)
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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 0
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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(fi, frame_saved_regs) ( \
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(frame_saved_regs) = *(fi)->saved_regs, \
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(frame_saved_regs).regs[SP_REGNUM] = (fi)->frame)
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/* Things needed for making the inferior call functions. */
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#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
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sp = alpha_push_arguments(nargs, args, sp, struct_return, struct_addr)
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#ifdef __STDC__
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struct value;
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#endif
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extern CORE_ADDR
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alpha_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int, CORE_ADDR));
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/* Push an empty stack frame, to record the current PC, etc. */
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#define PUSH_DUMMY_FRAME alpha_push_dummy_frame()
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extern void
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alpha_push_dummy_frame PARAMS ((void));
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/* Discard from the stack the innermost frame, restoring all registers. */
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#define POP_FRAME alpha_pop_frame()
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extern void
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alpha_pop_frame PARAMS ((void));
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/* Alpha OSF/1 inhibits execution of code on the stack.
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But there is no need for a dummy on the alpha. PUSH_ARGUMENTS
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takes care of all argument handling and bp_call_dummy takes care
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of stopping the dummy. */
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#define CALL_DUMMY_LOCATION AT_ENTRY_POINT
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/* We need a fake CALL_DUMMY definition to enable the proper
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call_function_by_hand and to avoid zero length array warnings
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in valops.c */
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#define CALL_DUMMY {\
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0x80, /* call_pal bpt */ \
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}
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#define CALL_DUMMY_START_OFFSET (0)
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#define CALL_DUMMY_BREAKPOINT_OFFSET (0)
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/* Insert the specified number of args and function address
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into a call sequence of the above form stored at DUMMYNAME.
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We only have to set RA_REGNUM to the dummy breakpoint address
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and T12_REGNUM (the `procedure value register') to the function address. */
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#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
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{ \
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CORE_ADDR bp_address = entry_point_address (); \
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if (bp_address == 0) \
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error ("no place to put call"); \
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write_register (RA_REGNUM, bp_address); \
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write_register (T12_REGNUM, fun); \
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}
|
|||
|
|
|
|||
|
|
/* There's a mess in stack frame creation. See comments in blockframe.c
|
|||
|
|
near reference to INIT_FRAME_PC_FIRST. */
|
|||
|
|
|
|||
|
|
#define INIT_FRAME_PC(fromleaf, prev) /* nada */
|
|||
|
|
|
|||
|
|
#define INIT_FRAME_PC_FIRST(fromleaf, prev) \
|
|||
|
|
(prev)->pc = ((fromleaf) ? SAVED_PC_AFTER_CALL ((prev)->next) : \
|
|||
|
|
(prev)->next ? FRAME_SAVED_PC ((prev)->next) : read_pc ());
|
|||
|
|
|
|||
|
|
/* Special symbol found in blocks associated with routines. We can hang
|
|||
|
|
alpha_extra_func_info_t's off of this. */
|
|||
|
|
|
|||
|
|
#define MIPS_EFI_SYMBOL_NAME "__GDB_EFI_INFO__"
|
|||
|
|
|
|||
|
|
/* Specific information about a procedure.
|
|||
|
|
This overlays the ALPHA's PDR records,
|
|||
|
|
alpharead.c (ab)uses this to save memory */
|
|||
|
|
|
|||
|
|
typedef struct alpha_extra_func_info {
|
|||
|
|
long numargs; /* number of args to procedure (was iopt) */
|
|||
|
|
PDR pdr; /* Procedure descriptor record */
|
|||
|
|
} *alpha_extra_func_info_t;
|
|||
|
|
|
|||
|
|
/* Define the extra_func_info that mipsread.c needs.
|
|||
|
|
FIXME: We should define our own PDR interface, perhaps in a separate
|
|||
|
|
header file. This would get rid of the <bfd.h> inclusion in all sources
|
|||
|
|
and would abstract the mips/alpha interface from ecoff. */
|
|||
|
|
#define mips_extra_func_info alpha_extra_func_info
|
|||
|
|
#define mips_extra_func_info_t alpha_extra_func_info_t
|
|||
|
|
|
|||
|
|
#define EXTRA_FRAME_INFO \
|
|||
|
|
int localoff; \
|
|||
|
|
alpha_extra_func_info_t proc_desc; \
|
|||
|
|
struct frame_saved_regs *saved_regs;
|
|||
|
|
|
|||
|
|
#define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)
|
|||
|
|
extern void
|
|||
|
|
init_extra_frame_info PARAMS ((struct frame_info *));
|
|||
|
|
|
|||
|
|
#define PRINT_EXTRA_FRAME_INFO(fi) \
|
|||
|
|
{ \
|
|||
|
|
if (fi && fi->proc_desc && fi->proc_desc->pdr.framereg < NUM_REGS) \
|
|||
|
|
printf_filtered (" frame pointer is at %s+%d\n", \
|
|||
|
|
reg_names[fi->proc_desc->pdr.framereg], \
|
|||
|
|
fi->proc_desc->pdr.frameoffset); \
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* It takes two values to specify a frame on the ALPHA. Sigh.
|
|||
|
|
|
|||
|
|
In fact, at the moment, the *PC* is the primary value that sets up
|
|||
|
|
a frame. The PC is looked up to see what function it's in; symbol
|
|||
|
|
information from that function tells us which register is the frame
|
|||
|
|
pointer base, and what offset from there is the "virtual frame pointer".
|
|||
|
|
(This is usually an offset from SP.) FIXME -- this should be cleaned
|
|||
|
|
up so that the primary value is the SP, and the PC is used to disambiguate
|
|||
|
|
multiple functions with the same SP that are at different stack levels. */
|
|||
|
|
|
|||
|
|
#define SETUP_ARBITRARY_FRAME(argc, argv) setup_arbitrary_frame (argc, argv)
|
|||
|
|
/* FIXME: Depends on equivalence between FRAME and "struct frame_info *",
|
|||
|
|
and equivalence between CORE_ADDR and FRAME_ADDR. */
|
|||
|
|
extern struct frame_info *setup_arbitrary_frame PARAMS ((int, CORE_ADDR *));
|