531 lines
20 KiB
C
531 lines
20 KiB
C
/* Definitions to make GDB run on a Pyramidax under OSx 4.0 (4.2bsd).
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Copyright (C) 1988, 1989 Free Software Foundation, Inc.
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This file is part of GDB.
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GDB 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 1, or (at your option)
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any later version.
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GDB 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 GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#define TARGET_BYTE_ORDER BIG_ENDIAN
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/* Traditional Unix virtual address spaces have thre regions: text,
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data and stack. The text, initialised data, and uninitialised data
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are represented in separate segments of the a.out file.
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When a process dumps core, the data and stack regions are written
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to a core file. This gives a debugger enough information to
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reconstruct (and debug) the virtual address space at the time of
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the coredump.
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Pyramids have an distinct fourth region of the virtual address
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space, in which the contents of the windowed registers are stacked
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in fixed-size frames. Pyramid refer to this region as the control
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stack. Each call (or trap) automatically allocates a new register
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frame; each return deallocates the current frame and restores the
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windowed registers to their values before the call.
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When dumping core, the control stack is written to a core files as
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a third segment. The core-handling functions need to know to deal
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with it. */
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/* Tell core.c there is an extra segment. */
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#define REG_STACK_SEGMENT
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/* Floating point is IEEE compatible on most Pyramid hardware
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(Older processors do not have IEEE NaNs). */
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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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/* 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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/* FIXME -- do we want to skip insns to allocate the local frame?
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If so, what do they look like?
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This is becoming harder, since tege@sics.SE wants to change
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gcc to not output a prologue when no frame is needed. */
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#define SKIP_PROLOGUE(pc) do {} while (0)
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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) FRAME_SAVED_PC(frame)
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/* Address of end of stack space. */
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/* This seems to be right for the 90x comp.vuw.ac.nz.
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The correct value at any site may be a function of the configured
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maximum control stack depth. If so, I don't know where the
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control-stack depth is configured, so I can't #include it here. */
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#define STACK_END_ADDR (0xc00cc000)
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/* Register window stack (Control stack) stack definitions
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- Address of beginning of control stack.
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- size of control stack frame
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(Note that since crts0 is usually the first function called,
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main()'s control stack is one frame (0x80 bytes) beyond this value. */
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#define CONTROL_STACK_ADDR (0xc00cd000)
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/* Bytes in a register window -- 16 parameter regs, 16 local regs
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for each call, is 32 regs * 4 bytes */
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#define CONTROL_STACK_FRAME_SIZE (32*4)
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/* FIXME. On a pyr, Data Stack grows downward; control stack goes upwards.
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Which direction should we use for INNER_THAN, PC_INNER_THAN ?? */
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#define INNER_THAN <
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#define PC_INNER_THAN >
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/* Stack has strict alignment. */
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#define STACK_ALIGN(ADDR) (((ADDR)+3)&-4)
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/* Sequence of bytes for breakpoint instruction. */
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#define BREAKPOINT {0xf0, 00, 00, 00}
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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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On a pyr, this is either "ret" or "retd".
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It would be friendly to check that any "retd" always had an
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argument of 0, since anything else is invalid. */
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#define ABOUT_TO_RETURN(pc) \
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(((read_memory_integer (pc, 2) & 0x3ff0) == 0x3090) || \
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((read_memory_integer (pc, 2) & 0x0ff0) == 0x00a0))
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/* Return 1 if P points to an invalid floating point value.
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LEN is the length in bytes -- not relevant on the Vax. */
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/* FIXME -- this is ok for a vax, bad for big-endian ieee format.
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I would use the definition for a Sun; but it is no better! */
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#define INVALID_FLOAT(p, len) ((*(short *) p & 0xff80) == 0x8000)
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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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/* pyramids have 64, plus one for the PSW; plus perhaps one more for the
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kernel stack pointer (ksp) and control-stack pointer (CSP) */
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#define NUM_REGS 67
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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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{"gr0", "gr1", "gr2", "gr3", "gr4", "gr5", "gr6", "gr7", \
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"gr8", "gr9", "gr10", "gr11", "logpsw", "cfp", "sp", "pc", \
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"pr0", "pr1", "pr2", "pr3", "pr4", "pr5", "pr6", "pr7", \
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"pr8", "pr9", "pr10", "pr11", "pr12", "pr13", "pr14", "pr15", \
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"lr0", "lr1", "lr2", "lr3", "lr4", "lr5", "lr6", "lr7", \
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"lr8", "lr9", "lr10", "lr11", "lr12", "lr13", "lr14", "lr15", \
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"tr0", "tr1", "tr2", "tr3", "tr4", "tr5", "tr6", "tr7", \
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"tr8", "tr9", "tr10", "tr11", "tr12", "tr13", "tr14", "tr15", \
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"psw", "ksp", "csp"}
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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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/* pseudo-registers: */
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#define PS_REGNUM 64 /* Contains processor status */
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#define PSW_REGNUM 64 /* Contains current psw, whatever it is.*/
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#define CSP_REGNUM 65 /* address of this control stack frame*/
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#define KSP_REGNUM 66 /* Contains process's Kernel Stack Pointer */
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#define CFP_REGNUM 13 /* Current data-stack frame ptr */
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#define TR0_REGNUM 48 /* After function call, contains
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function result */
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/* Registers interesting to the machine-independent part of gdb*/
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#define FP_REGNUM CSP_REGNUM /* Contains address of executing (control)
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stack frame */
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#define SP_REGNUM 14 /* Contains address of top of stack -??*/
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#define PC_REGNUM 15 /* Contains program counter */
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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) pyr_do_registers_info(_regnum)
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/* need this so we can find the global registers: they never get saved. */
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extern unsigned int global_reg_offset;
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extern unsigned int last_frame_offset;
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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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/* the Pyramid 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) >= 16 && (regnum) < 64)
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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 the Pyramid, 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 the Pyramid, 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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/* FIXME: It seems impossible for both EXTRACT_RETURN_VALUE and
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STORE_RETURN_VALUE to be correct. */
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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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/****FIXME****/
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#define STORE_STRUCT_RETURN(ADDR, SP) \
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{ write_register (TR0_REGNUM, (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. */
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/* Note that on a register-windowing machine (eg, Pyr, SPARC), this is
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where the value is found after the function call -- ie, it should
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correspond to GNU CC's FUNCTION_VALUE rather than FUNCTION_OUTGOING_VALUE.*/
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#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
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bcopy (((int *)(REGBUF))+TR0_REGNUM, 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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/* on pyrs, values are returned in */
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#define STORE_RETURN_VALUE(TYPE,VALBUF) \
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write_register_bytes (REGISTER_BYTE(TR0_REGNUM), 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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/* FIXME */
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#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
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( ((int *)(REGBUF)) [TR0_REGNUM])
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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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#define EXTRA_FRAME_INFO \
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FRAME_ADDR bottom; \
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CORE_ADDR frame_cfp; \
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CORE_ADDR frame_window_addr;
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#define INIT_EXTRA_FRAME_INFO(fci) \
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do { \
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(fci)->frame_window_addr = (fci)->frame; \
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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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(fci)->frame_cfp = \
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read_register (CFP_REGNUM); \
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/***fprintf (stderr, \
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"[[creating new frame for %0x,pc=%0x,csp=%0x]]\n", \
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(fci)->frame, (fci)->pc,(fci)->frame_cfp);*/ \
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} while (0);
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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 pyr, the frame's nominal address is the address
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of parameter register 0. The previous frame is found 32 words up. */
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#define FRAME_CHAIN(thisframe) \
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( (thisframe) -> frame - CONTROL_STACK_FRAME_SIZE)
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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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/*((thisframe) >= CONTROL_STACK_ADDR))*/
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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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/* 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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I do not understand what this means on a Pyramid, where functions
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*always* have a control-stack frame, but may or may not have a
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frame on the data stack. Since GBD uses the value of the
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control stack pointer as its "address" of a frame, FRAMELESS
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is always 1, so does not need to be defined. */
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/* Where is the PC for a specific frame */
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#define FRAME_SAVED_PC(fi) \
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((CORE_ADDR) (read_memory_integer ( (fi) -> frame + 60, 4)))
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/* There may be bugs in FRAME_ARGS_ADDRESS and FRAME_LOCALS_ADDRESS;
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or there may be bugs in accessing the registers that break
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their definitions.
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Having the macros expand into functions makes them easier to debug.
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When the bug is finally located, the inline macro defintions can
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be un-#if 0ed, and frame_args_addr and frame_locals_address can
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be deleted from pyr-dep.c */
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/* If the argument is on the stack, it will be here. */
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#define FRAME_ARGS_ADDRESS(fi) \
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frame_args_addr(fi)
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#define FRAME_LOCALS_ADDRESS(fi) \
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frame_locals_address(fi)
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/* The following definitions doesn't seem to work.
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I don't understand why. */
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#if 0
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#define FRAME_ARGS_ADDRESS(fi) \
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/*(FRAME_FP(fi) + (13*4))*/ (read_register (CFP_REGNUM))
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#define FRAME_LOCALS_ADDRESS(fi) \
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((fi)->frame +(16*4))
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#endif /* 0 */
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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) (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 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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Note that on register window machines, we are currently making the
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assumption that window registers are being saved somewhere in the
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frame in which they are being used. If they are stored in an
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inferior frame, find_saved_register will break.
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On pyrs, frames of window registers are stored contiguously on a
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separate stack. All window registers are always stored.
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The pc and psw (gr15 and gr14) are also always saved: the call
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insn saves them in pr15 and pr14 of the new frame (tr15,tr14 of the
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old frame).
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The data-stack frame pointer (CFP) is only saved in functions which
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allocate a (data)stack frame (with "adsf"). We detect them by
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looking at the first insn of the procedure.
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Other non-window registers (gr0-gr11) are never saved. Pyramid's C
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compiler and gcc currently ignore them, so it's not an issue. */
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#define FRAME_FIND_SAVED_REGS(fi_p, frame_saved_regs) \
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{ register int regnum; \
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register CORE_ADDR pc; \
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register CORE_ADDR fn_start_pc; \
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register int first_insn; \
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register CORE_ADDR prev_cf_addr; \
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register int window_ptr; \
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FRAME fid = FRAME_INFO_ID (fi_p); \
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if (!fid) fatal ("Bad frame info struct in FRAME_FIND_SAVED_REGS"); \
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bzero (&(frame_saved_regs), sizeof (frame_saved_regs)); \
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\
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window_ptr = prev_cf_addr = FRAME_FP(fi_p); \
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\
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for (regnum = 16 ; regnum < 64; regnum++,window_ptr+=4) \
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{ \
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(frame_saved_regs).regs[regnum] = window_ptr; \
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} \
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\
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/* In each window, psw, and pc are "saved" in tr14,tr15. */ \
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/*** psw is sometimes saved in gr12 (so sez <sys/pcb.h>) */ \
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(frame_saved_regs).regs[PS_REGNUM] = FRAME_FP(fi_p) + (14*4); \
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\
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/*(frame_saved_regs).regs[PC_REGNUM] = (frame_saved_regs).regs[31];*/ \
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(frame_saved_regs).regs[PC_REGNUM] = FRAME_FP(fi_p) + ((15+32)*4); \
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\
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/* Functions that allocate a frame save sp *where*? */ \
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/*first_insn = read_memory_integer (get_pc_function_start ((fi_p)->pc),4); */ \
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\
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fn_start_pc = (get_pc_function_start ((fi_p)->pc)); \
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first_insn = read_memory_integer(fn_start_pc, 4); \
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\
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if (0x08 == ((first_insn >> 20) &0x0ff)) { \
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/* NB: because WINDOW_REGISTER_P(cfp) is false, a saved cfp \
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in this frame is only visible in this frame's callers. \
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That means the cfp we mark saved is my caller's cfp, ie pr13. \
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I don't understand why we don't have to do that for pc, too. */ \
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\
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(frame_saved_regs).regs[CFP_REGNUM] = FRAME_FP(fi_p)+(13*4); \
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\
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(frame_saved_regs).regs[SP_REGNUM] = \
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read_memory_integer (FRAME_FP(fi_p)+((13+32)*4),4); \
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} \
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\
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/* \
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*(frame_saved_regs).regs[CFP_REGNUM] = (frame_saved_regs).regs[61]; \
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* (frame_saved_regs).regs[SP_REGNUM] = \
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* read_memory_integer (FRAME_FP(fi_p)+((13+32)*4),4); \
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||
*/ \
|
||
\
|
||
(frame_saved_regs).regs[CSP_REGNUM] = prev_cf_addr; \
|
||
}
|
||
|
||
/* Things needed for making the inferior call functions. */
|
||
#if 0
|
||
/* These are all lies. These macro definitions are appropriate for a
|
||
SPARC. On a pyramid, pushing a dummy frame will
|
||
surely involve writing the control stack pointer,
|
||
then saving the pc. This requires a privileged instruction.
|
||
Maybe one day Pyramid can be persuaded to add a syscall to do this.
|
||
Until then, we are out of luck. */
|
||
|
||
/* Push an empty stack frame, to record the current PC, etc. */
|
||
|
||
#define PUSH_DUMMY_FRAME \
|
||
{ register CORE_ADDR sp = read_register (SP_REGNUM);\
|
||
register int regnum; \
|
||
sp = push_word (sp, 0); /* arglist */ \
|
||
for (regnum = 11; regnum >= 0; regnum--) \
|
||
sp = push_word (sp, read_register (regnum)); \
|
||
sp = push_word (sp, read_register (PC_REGNUM)); \
|
||
sp = push_word (sp, read_register (FP_REGNUM)); \
|
||
/* sp = push_word (sp, read_register (AP_REGNUM));*/ \
|
||
sp = push_word (sp, (read_register (PS_REGNUM) & 0xffef) \
|
||
+ 0x2fff0000); \
|
||
sp = push_word (sp, 0); \
|
||
write_register (SP_REGNUM, sp); \
|
||
write_register (FP_REGNUM, sp); \
|
||
/* write_register (AP_REGNUM, sp + 17 * sizeof (int));*/ }
|
||
|
||
/* Discard from the stack the innermost frame, restoring all registers. */
|
||
|
||
#define POP_FRAME \
|
||
{ register CORE_ADDR fp = read_register (FP_REGNUM); \
|
||
register int regnum; \
|
||
register int regmask = read_memory_integer (fp + 4, 4); \
|
||
write_register (PS_REGNUM, \
|
||
(regmask & 0xffff) \
|
||
| (read_register (PS_REGNUM) & 0xffff0000)); \
|
||
write_register (PC_REGNUM, read_memory_integer (fp + 16, 4)); \
|
||
write_register (FP_REGNUM, read_memory_integer (fp + 12, 4)); \
|
||
/* write_register (AP_REGNUM, read_memory_integer (fp + 8, 4));*/ \
|
||
fp += 16; \
|
||
for (regnum = 0; regnum < 12; regnum++) \
|
||
if (regmask & (0x10000 << regnum)) \
|
||
write_register (regnum, read_memory_integer (fp += 4, 4)); \
|
||
fp = fp + 4 + ((regmask >> 30) & 3); \
|
||
if (regmask & 0x20000000) \
|
||
{ regnum = read_memory_integer (fp, 4); \
|
||
fp += (regnum + 1) * 4; } \
|
||
write_register (SP_REGNUM, fp); \
|
||
set_current_frame (read_register (FP_REGNUM)); }
|
||
|
||
/* This sequence of words is the instructions
|
||
calls #69, @#32323232
|
||
bpt
|
||
Note this is 8 bytes. */
|
||
|
||
#define CALL_DUMMY {0x329f69fb, 0x03323232}
|
||
|
||
#define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */
|
||
|
||
/* 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, pc, fun, nargs, args, type, gcc_p) \
|
||
{ *((char *) dummyname + 1) = nargs; \
|
||
*(int *)((char *) dummyname + 3) = fun; }
|
||
#endif /* 0 */
|
||
|
||
#define POP_FRAME \
|
||
{ error ("The return command is not supported on this machine."); }
|