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330 lines
11 KiB
C
330 lines
11 KiB
C
/* Target machine description for SGI Iris under Irix, for GDB.
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Copyright 1990, 1991, 1992 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 "coff/sym.h" /* Needed for PDR below. */
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#include "coff/symconst.h"
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#define TARGET_BYTE_ORDER BIG_ENDIAN
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/* Floating point is IEEE compliant */
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#define IEEE_FLOAT
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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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/* SGI's assembler doesn't grok dollar signs in identifiers.
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So we use dots instead. This item must be coordinated with G++. */
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#undef CPLUS_MARKER
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#define CPLUS_MARKER '.'
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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 = mips_skip_prologue(pc)
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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) read_register(RA_REGNUM)
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/* Are we currently handling a signal */
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#define IN_SIGTRAMP(pc, name) in_sigtramp(pc, name)
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/* Address of end of stack space. */
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#define STACK_END_ADDR (0x7ffff000)
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/* Stack grows downward. */
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#define INNER_THAN <
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#define BREAKPOINT {0, 0x5, 0, 0xd}
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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 0
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/* Nonzero if instruction at PC is a return instruction. "j ra" on mips. */
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#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0x3e00008)
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/* Return 1 if P points to an invalid floating point value. */
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#define INVALID_FLOAT(p,l) isa_NAN(p,l)
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/* Say how long (all) 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 71
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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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{ "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", \
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"t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", \
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"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \
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"t8", "t9", "k0", "k1", "gp", "sp", "fp", "ra", \
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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", "cause", "bad", "hi", "lo", "fsr", "fir" \
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}
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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 A0_REGNUM 4 /* Loc of first arg during a subr call */
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#define SP_REGNUM 29 /* Contains address of top of stack */
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#define FP_REGNUM 30 /* Pseudo register that contains true address of executing stack frame */
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#define RA_REGNUM 31 /* Contains return address value */
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#define FP0_REGNUM 32 /* Floating point register 0 (single float) */
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#define PC_REGNUM 64 /* Contains program counter */
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#define PS_REGNUM 65 /* Contains processor status */
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#define HI_REGNUM 67 /* Multiple/divide temp */
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#define LO_REGNUM 68 /* ... */
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#define FCRCS_REGNUM 69 /* FP control/status */
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#define FCRIR_REGNUM 70 /* FP implementation/revision */
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/* Define DO_REGISTERS_INFO() to do machine-specific formatting
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of register dumps. */
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#define DO_REGISTERS_INFO(_regnum, fp) mips_do_registers_info(_regnum, fp)
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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*4)
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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) * 4)
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/* Number of bytes of storage in the actual machine representation
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for register N. On mips, all regs are 4 bytes. */
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#define REGISTER_RAW_SIZE(N) 4
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/* Number of bytes of storage in the program's representation
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for register N. On mips, all regs are 4 bytes. */
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#define REGISTER_VIRTUAL_SIZE(N) 4
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/* Largest value REGISTER_RAW_SIZE can have. */
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#define MAX_REGISTER_RAW_SIZE 4
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/* Largest value REGISTER_VIRTUAL_SIZE can have. */
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#define MAX_REGISTER_VIRTUAL_SIZE 4
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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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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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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) builtin_type_int
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/* Store the address of the place in which to copy the structure the
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subroutine will return. This is called from call_function. */
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#define STORE_STRUCT_RETURN(addr, sp) \
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{ sp = push_word(sp, addr);}
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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. XXX floats */
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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bcopy (REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), 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 (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 2), 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+16))
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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)mips_frame_chain(thisframe)
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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 mips, 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) (mips_frame_saved_pc(FRAME))
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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(num, fi) (num = mips_frame_num_args(fi))
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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(frame_info, frame_saved_regs) ( \
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(frame_saved_regs) = *(frame_info)->saved_regs, \
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(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame)
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/* Things needed for making the inferior call functions. */
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/* Stack has strict alignment. However, use PUSH_ARGUMENTS
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to take care of it. */
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/*#define STACK_ALIGN(addr) (((addr)+3)&~3)*/
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#define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
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sp = mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
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/* Push an empty stack frame, to record the current PC, etc. */
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#define PUSH_DUMMY_FRAME mips_push_dummy_frame()
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/* Discard from the stack the innermost frame, restoring all registers. */
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#define POP_FRAME mips_pop_frame()
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#define MK_OP(op,rs,rt,offset) (((op)<<26)|((rs)<<21)|((rt)<<16)|(offset))
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#define CALL_DUMMY_SIZE (16*4)
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#define Dest_Reg 2
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#define CALL_DUMMY {\
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MK_OP(0,RA_REGNUM,0,8), /* jr $ra # Fake ABOUT_TO_RETURN ...*/\
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0, /* nop # ... to stop raw backtrace*/\
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0x27bd0000, /* addu sp,?0 # Pseudo prologue */\
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/* Start here: */\
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MK_OP(061,SP_REGNUM,12,0), /* lwc1 $f12,0(sp) # Reload first 4 args*/\
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MK_OP(061,SP_REGNUM,13,4), /* lwc1 $f13,4(sp) */\
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MK_OP(061,SP_REGNUM,14,8), /* lwc1 $f14,8(sp) */\
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MK_OP(061,SP_REGNUM,15,12), /* lwc1 $f15,12(sp) */\
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MK_OP(043,SP_REGNUM,4,0), /* lw $r4,0(sp) # Re-load FP regs*/\
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MK_OP(043,SP_REGNUM,5,4), /* lw $r5,4(sp) */\
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MK_OP(043,SP_REGNUM,6,8), /* lw $r6,8(sp) */\
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MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
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(017<<26)| (Dest_Reg << 16), /* lui $r31,<target upper 16 bits>*/\
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MK_OP(13,Dest_Reg,Dest_Reg,0), /* ori $r31,$r31,<lower 16 bits>*/ \
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(Dest_Reg<<21) | (31<<11) | 9, /* jalr $r31 */\
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MK_OP(043,SP_REGNUM,7,12), /* lw $r7,12(sp) */\
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0x5000d, /* bpt */\
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}
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#define CALL_DUMMY_START_OFFSET 12
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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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#define FIX_CALL_DUMMY(dummyname, start_sp, fun, nargs, args, rettype, gcc_p)\
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(((int*)dummyname)[11] |= (((unsigned long)(fun)) >> 16), \
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((int*)dummyname)[12] |= (unsigned short)(fun))
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/* Specific information about a procedure.
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This overlays the MIPS's PDR records,
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mipsread.c (ab)uses this to save memory */
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typedef struct mips_extra_func_info {
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long numargs; /* number of args to procedure (was iopt) */
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PDR pdr; /* Procedure descriptor record */
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} *mips_extra_func_info_t;
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#define EXTRA_FRAME_INFO \
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mips_extra_func_info_t proc_desc; \
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int num_args;\
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struct frame_saved_regs *saved_regs;
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#define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)
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/* Size of elements in jmpbuf */
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#define JB_ELEMENT_SIZE 4
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/* Figure out where the longjmp will land. We expect that we have just entered
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longjmp and haven't yet setup the stack frame, so the args are still in the
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argument regs. a0 (CALL_ARG0) points at the jmp_buf structure from which we
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extract the pc (JB_PC) that we will land at. The pc is copied into ADDR.
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This routine returns true on success */
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/* Note that caller must #include <setjmp.h> in order to get def of JB_* */
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#define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
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