588 lines
22 KiB
C
588 lines
22 KiB
C
/* Parameters for target machine of Sun 4, for GDB, the GNU debugger.
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Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
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Contributed by Michael Tiemann (tiemann@mcc.com)
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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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#define TARGET_BYTE_ORDER BIG_ENDIAN
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/* Floating point is IEEE compatible. */
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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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/* When passing a structure to a function, Sun cc passes the address
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in a register, not the structure itself. It (under SunOS4) creates
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two symbols, so we get a LOC_ARG saying the address is on the stack
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(a lie, and a serious one since we don't know which register to
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use), and a LOC_REGISTER saying that the struct is in a register
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(sort of a lie, but fixable with REG_STRUCT_HAS_ADDR). Gcc version
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two (as of 1.92) behaves like sun cc, but I don't know how we can
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distinguish between gcc version 1 and gcc version 2.
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This still doesn't work if the argument is not one passed in a
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register (i.e. it's the 7th or later argument). */
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#define REG_STRUCT_HAS_ADDR(gcc_p) (!(gcc_p))
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#define STRUCT_ARG_SYM_GARBAGE(gcc_p) (!(gcc_p))
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/* If Pcc says that a parameter is a short, it's a short. This is
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because the parameter does get passed in in a register as an int,
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but pcc puts it onto the stack frame as a short (not nailing
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whatever else might be there. I'm not sure that I consider this
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swift. Sigh.)
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No, don't do this. The problem here is that pcc says that the
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argument is in the upper half of the word reserved on the stack,
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but puts it in the lower half. */
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/* #define BELIEVE_PCC_PROMOTION 1 */
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/* OK, I've added code to dbxread.c to deal with this case. */
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#define BELIEVE_PCC_PROMOTION_TYPE
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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. SKIP_PROLOGUE_FRAMELESS_P advances
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the PC past some of the prologue, but stops as soon as it
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knows that the function has a frame. Its result is equal
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to its input PC if the function is frameless, unequal otherwise. */
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#define SKIP_PROLOGUE(pc) \
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{ pc = skip_prologue (pc, 0); }
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#define SKIP_PROLOGUE_FRAMELESS_P(pc) \
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{ pc = skip_prologue (pc, 1); }
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extern CORE_ADDR skip_prologue ();
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/* Immediately after a function call, return the saved pc.
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Can't 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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/* On the Sun 4 under SunOS, the compile will leave a fake insn which
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encodes the structure size being returned. If we detect such
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a fake insn, step past it. */
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#define PC_ADJUST(pc) sparc_pc_adjust(pc)
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extern CORE_ADDR sparc_pc_adjust();
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#define SAVED_PC_AFTER_CALL(frame) PC_ADJUST (read_register (RP_REGNUM))
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/* Address of the end of stack space. We get this from the system
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include files. */
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#include <sys/types.h>
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#include <machine/vmparam.h>
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#define STACK_END_ADDR USRSTACK
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#define INNER_THAN <
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/* Stack has strict alignment. */
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#define STACK_ALIGN(ADDR) (((ADDR)+7)&-8)
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/* Sequence of bytes for breakpoint instruction. */
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#define BREAKPOINT {0x91, 0xd0, 0x20, 0x01}
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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. */
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/* For SPARC, this is either a "jmpl %o7+8,%g0" or "jmpl %i7+8,%g0".
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Note: this does not work for functions returning structures under SunOS. */
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#define ABOUT_TO_RETURN(pc) \
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((read_memory_integer (pc, 4)|0x00040000) == 0x81c7e008)
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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 (ordinary) 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 72
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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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{ "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7", \
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"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7", \
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"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7", \
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"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7", \
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\
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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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\
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"y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr" };
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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 G0_REGNUM 0 /* %g0 */
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#define G1_REGNUM 1 /* %g1 */
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#define O0_REGNUM 8 /* %o0 */
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#define SP_REGNUM 14 /* Contains address of top of stack, \
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which is also the bottom of the frame. */
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#define RP_REGNUM 15 /* Contains return address value, *before* \
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any windows get switched. */
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#define O7_REGNUM 15 /* Last local reg not saved on stack frame */
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#define L0_REGNUM 16 /* First local reg that's saved on stack frame
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rather than in machine registers */
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#define I0_REGNUM 24 /* %i0 */
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#define FP_REGNUM 30 /* Contains address of executing stack frame */
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#define I7_REGNUM 31 /* Last local reg saved on stack frame */
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#define FP0_REGNUM 32 /* Floating point register 0 */
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#define Y_REGNUM 64 /* Temp register for multiplication, etc. */
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#define PS_REGNUM 65 /* Contains processor status */
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#define WIM_REGNUM 66 /* Window Invalid Mask (not really supported) */
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#define TBR_REGNUM 67 /* Trap Base Register (not really supported) */
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#define PC_REGNUM 68 /* Contains program counter */
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#define NPC_REGNUM 69 /* Contains next PC */
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#define FPS_REGNUM 70 /* Floating point status register */
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#define CPS_REGNUM 71 /* Coprocessor status register */
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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 (32*4+32*4+8*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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/* ?? */
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#define REGISTER_BYTE(N) ((N)*4)
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/* The SPARC processor has register windows. */
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#define HAVE_REGISTER_WINDOWS
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/* Is this register part of the register window system? A yes answer
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implies that 1) The name of this register will not be the same in
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other frames, and 2) This register is automatically "saved" (out
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registers shifting into ins counts) upon subroutine calls and thus
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there is no need to search more than one stack frame for it. */
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#define REGISTER_IN_WINDOW_P(regnum) \
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((regnum) >= 8 && (regnum) < 32)
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/* Number of bytes of storage in the actual machine representation
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for register N. */
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/* On the SPARC, 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. */
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/* On the SPARC, 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 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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{ 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) \
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((N) < 32 ? builtin_type_int : (N) < 64 ? builtin_type_float : \
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builtin_type_int)
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/* Writing to %g0 is a noop (not an error or exception or anything like
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that, however). */
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#define CANNOT_STORE_REGISTER(regno) ((regno) == G0_REGNUM)
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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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{ target_write_memory ((SP)+(16*4), (char *)&(ADDR), 4); }
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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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{ \
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if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
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{ \
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bcopy (((int *)(REGBUF))+FP0_REGNUM, \
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(VALBUF), TYPE_LENGTH(TYPE)); \
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} \
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else \
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bcopy ((char *)(REGBUF) + 4 * 8 + \
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(TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)), \
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(VALBUF), TYPE_LENGTH(TYPE)); \
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}
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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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/* On sparc, values are returned in register %o0. */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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{ \
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if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \
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/* Floating-point values are returned in the register pair */ \
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/* formed by %f0 and %f1 (doubles are, anyway). */ \
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write_register_bytes (REGISTER_BYTE (FP0_REGNUM), (VALBUF), \
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TYPE_LENGTH (TYPE)); \
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else \
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/* Other values are returned in register %o0. */ \
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write_register_bytes (REGISTER_BYTE (O0_REGNUM), (VALBUF), \
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TYPE_LENGTH (TYPE)); \
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}
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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) \
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(sparc_extract_struct_value_address (REGBUF))
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CORE_ADDR sparc_extract_struct_value_address (
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#ifdef __STDC__
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char [REGISTER_BYTES]
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#endif
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);
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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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/* If you're not compiling this on a sun, you'll have to get a copy
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of <sun4/reg.h> (also known as <machine/reg.h>). */
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#include <sun4/reg.h>
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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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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 the case of the Sun 4, the frame-chain's nominal address
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is held in the frame pointer register.
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On the Sun4, the frame (in %fp) is %sp for the previous frame.
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From the previous frame's %sp, we can find the previous frame's
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%fp: it is in the save area just above the previous frame's %sp.
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If we are setting up an arbitrary frame, we'll need to know where
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it ends. Hence the following. This part of the frame cache
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structure should be checked before it is assumed that this frame's
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bottom is in the stack pointer.
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If there isn't a frame below this one, the bottom of this frame is
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in the stack pointer.
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If there is a frame below this one, and the frame pointers are
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identical, it's a leaf frame and the bottoms are the same also.
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Otherwise the bottom of this frame is the top of the next frame. */
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#define EXTRA_FRAME_INFO FRAME_ADDR bottom;
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#define INIT_EXTRA_FRAME_INFO(fromleaf, fci) \
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(fci)->bottom = \
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((fci)->next ? \
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((fci)->frame == (fci)->next_frame ? \
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(fci)->next->bottom : (fci)->next->frame) : \
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read_register (SP_REGNUM));
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#define FRAME_CHAIN(thisframe) (sparc_frame_chain (thisframe))
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CORE_ADDR sparc_frame_chain ();
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#define FRAME_CHAIN_VALID(chain, thisframe) \
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(chain != 0 && (outside_startup_file (FRAME_SAVED_PC (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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#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
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(FRAMELESS) = frameless_look_for_prologue(FI)
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/* Where is the PC for a specific frame */
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#define FRAME_SAVED_PC(FRAME) frame_saved_pc (FRAME)
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CORE_ADDR frame_saved_pc ();
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/* If the argument is on the stack, it will be here. */
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#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
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#define FRAME_STRUCT_ARGS_ADDRESS(fi) ((fi)->frame)
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#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
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/* Set VAL to the number of args passed to frame described by FI.
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Can set VAL to -1, meaning no way to tell. */
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/* We can't tell how many args there are
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now that the C compiler delays popping them. */
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#define FRAME_NUM_ARGS(val,fi) (val = -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 68
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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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The actual code is in sparc-tdep.c so we can debug it sanely. */
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#define FRAME_FIND_SAVED_REGS(fi, frame_saved_regs) \
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sparc_frame_find_saved_regs ((fi), &(frame_saved_regs))
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extern void sparc_frame_find_saved_regs ();
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/* Things needed for making the inferior call functions. */
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/*
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* First of all, let me give my opinion of what the DUMMY_FRAME
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* actually looks like.
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*
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* | |
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* | |
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* + - - - - - - - - - - - - - - - - +<-- fp (level 0)
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* | |
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* | |
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* | |
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* | |
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* | Frame of innermost program |
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* | function |
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* | |
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* | |
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* | |
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* | |
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* | |
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* |---------------------------------|<-- sp (level 0), fp (c)
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* | |
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* DUMMY | fp0-31 |
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* | |
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* | ------ |<-- fp - 0x80
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* FRAME | g0-7 |<-- fp - 0xa0
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* | i0-7 |<-- fp - 0xc0
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* | other |<-- fp - 0xe0
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* | ? |
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* | ? |
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* |---------------------------------|<-- sp' = fp - 0x140
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* | |
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* xcution start | |
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* sp' + 0x94 -->| CALL_DUMMY (x code) |
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* | |
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* | |
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* |---------------------------------|<-- sp'' = fp - 0x200
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* | align sp to 8 byte boundary |
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* | ==> args to fn <== |
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* Room for | |
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* i & l's + agg | CALL_DUMMY_STACK_ADJUST = 0x0x44|
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* |---------------------------------|<-- final sp (variable)
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* | |
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* | Where function called will |
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* | build frame. |
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* | |
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* | |
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*
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* I understand everything in this picture except what the space
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* between fp - 0xe0 and fp - 0x140 is used for. Oh, and I don't
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* understand why there's a large chunk of CALL_DUMMY that never gets
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* executed (its function is superceeded by PUSH_DUMMY_FRAME; they
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* are designed to do the same thing).
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*
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* PUSH_DUMMY_FRAME saves the registers above sp' and pushes the
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* register file stack down one.
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*
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* call_function then writes CALL_DUMMY, pushes the args onto the
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* stack, and adjusts the stack pointer.
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*
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* run_stack_dummy then starts execution (in the middle of
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* CALL_DUMMY, as directed by call_function).
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*/
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/* Push an empty stack frame, to record the current PC, etc. */
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#define PUSH_DUMMY_FRAME sparc_push_dummy_frame ()
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#define POP_FRAME sparc_pop_frame ()
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void sparc_push_dummy_frame (), sparc_pop_frame ();
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/* This sequence of words is the instructions
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save %sp,-0x140,%sp
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std %f30,[%fp-0x08]
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std %f28,[%fp-0x10]
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std %f26,[%fp-0x18]
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std %f24,[%fp-0x20]
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std %f22,[%fp-0x28]
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std %f20,[%fp-0x30]
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std %f18,[%fp-0x38]
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std %f16,[%fp-0x40]
|
||
std %f14,[%fp-0x48]
|
||
std %f12,[%fp-0x50]
|
||
std %f10,[%fp-0x58]
|
||
std %f8,[%fp-0x60]
|
||
std %f6,[%fp-0x68]
|
||
std %f4,[%fp-0x70]
|
||
std %f2,[%fp-0x78]
|
||
std %f0,[%fp-0x80]
|
||
std %g6,[%fp-0x88]
|
||
std %g4,[%fp-0x90]
|
||
std %g2,[%fp-0x98]
|
||
std %g0,[%fp-0xa0]
|
||
std %i6,[%fp-0xa8]
|
||
std %i4,[%fp-0xb0]
|
||
std %i2,[%fp-0xb8]
|
||
std %i0,[%fp-0xc0]
|
||
nop ! stcsr [%fp-0xc4]
|
||
nop ! stfsr [%fp-0xc8]
|
||
nop ! wr %npc,[%fp-0xcc]
|
||
nop ! wr %pc,[%fp-0xd0]
|
||
rd %tbr,%o0
|
||
st %o0,[%fp-0xd4]
|
||
rd %wim,%o1
|
||
st %o0,[%fp-0xd8]
|
||
rd %psr,%o0
|
||
st %o0,[%fp-0xdc]
|
||
rd %y,%o0
|
||
st %o0,[%fp-0xe0]
|
||
|
||
/..* 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 ld instruction. *../
|
||
|
||
ld [%sp+0x58],%o5
|
||
ld [%sp+0x54],%o4
|
||
ld [%sp+0x50],%o3
|
||
ld [%sp+0x4c],%o2
|
||
ld [%sp+0x48],%o1
|
||
call 0x00000000
|
||
ld [%sp+0x44],%o0
|
||
nop
|
||
ta 1
|
||
nop
|
||
|
||
note that this is 192 bytes, which is a multiple of 8 (not only 4) bytes.
|
||
note that the `call' insn is a relative, not an absolute call.
|
||
note that the `nop' at the end is needed to keep the trap from
|
||
clobbering things (if NPC pointed to garbage instead).
|
||
|
||
We actually start executing at the `sethi', since the pushing of the
|
||
registers (as arguments) is done by PUSH_DUMMY_FRAME. If this were
|
||
real code, the arguments for the function called by the CALL would be
|
||
pushed between the list of ST insns and the CALL, 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 these ST
|
||
insns to be performed again, lest the registers saved be taken for
|
||
arguments. */
|
||
|
||
#define CALL_DUMMY { 0x9de3bee0, 0xfd3fbff8, 0xf93fbff0, 0xf53fbfe8, \
|
||
0xf13fbfe0, 0xed3fbfd8, 0xe93fbfd0, 0xe53fbfc8, \
|
||
0xe13fbfc0, 0xdd3fbfb8, 0xd93fbfb0, 0xd53fbfa8, \
|
||
0xd13fbfa0, 0xcd3fbf98, 0xc93fbf90, 0xc53fbf88, \
|
||
0xc13fbf80, 0xcc3fbf78, 0xc83fbf70, 0xc43fbf68, \
|
||
0xc03fbf60, 0xfc3fbf58, 0xf83fbf50, 0xf43fbf48, \
|
||
0xf03fbf40, 0x01000000, 0x01000000, 0x01000000, \
|
||
0x01000000, 0x91580000, 0xd027bf50, 0x93500000, \
|
||
0xd027bf4c, 0x91480000, 0xd027bf48, 0x91400000, \
|
||
0xd027bf44, 0xda03a058, 0xd803a054, 0xd603a050, \
|
||
0xd403a04c, 0xd203a048, 0x40000000, 0xd003a044, \
|
||
0x01000000, 0x91d02001, 0x01000000, 0x01000000}
|
||
|
||
#define CALL_DUMMY_LENGTH 192
|
||
|
||
#define CALL_DUMMY_START_OFFSET 148
|
||
|
||
#define CALL_DUMMY_STACK_ADJUST 68
|
||
|
||
/* Insert the specified number of args and function address
|
||
into a call sequence of the above form stored at DUMMYNAME.
|
||
|
||
For structs and unions, if the function was compiled with Sun cc,
|
||
it expects 'unimp' after the call. But gcc doesn't use that
|
||
(twisted) convention. So leave a nop there for gcc (FIX_CALL_DUMMY
|
||
can assume it is operating on a pristine CALL_DUMMY, not one that
|
||
has already been customized for a different function). */
|
||
|
||
#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
|
||
{ \
|
||
*(int *)((char *) dummyname+168) = (0x40000000|((fun-(pc+168))>>2)); \
|
||
if (!gcc_p \
|
||
&& (TYPE_CODE (type) == TYPE_CODE_STRUCT \
|
||
|| TYPE_CODE (type) == TYPE_CODE_UNION)) \
|
||
*(int *)((char *) dummyname+176) = (TYPE_LENGTH (type) & 0x1fff); \
|
||
}
|
||
|
||
|
||
/* Sparc has no reliable single step ptrace call */
|
||
|
||
#define NO_SINGLE_STEP 1
|
||
extern void single_step ();
|
||
|
||
/* We need two arguments (in general) to the "info frame" command.
|
||
Note that the definition of this macro implies that there exists a
|
||
function "setup_arbitrary_frame" in sparc-tdep.c */
|
||
|
||
#define FRAME_SPECIFICATION_DYADIC
|
||
|
||
/* To print every pair of float registers as a double, we use this hook. */
|
||
|
||
#define PRINT_REGISTER_HOOK(regno) \
|
||
if (((regno) >= FP0_REGNUM) \
|
||
&& ((regno) < FP0_REGNUM + 32) \
|
||
&& (0 == (regno & 1))) { \
|
||
char doublereg[8]; /* two float regs */ \
|
||
if (!read_relative_register_raw_bytes (i , doublereg ) \
|
||
&& !read_relative_register_raw_bytes (i+1, doublereg+4)) { \
|
||
printf("\t"); \
|
||
print_floating (doublereg, builtin_type_double, stdout); \
|
||
} \
|
||
}
|
||
|