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871 lines
23 KiB
C
871 lines
23 KiB
C
/* Find a variable's value in memory, for GDB, the GNU debugger.
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Copyright 1986, 1987, 1989, 1991 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 "defs.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "frame.h"
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#include "value.h"
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#include "gdbcore.h"
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#include "inferior.h"
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#include "target.h"
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#if !defined (GET_SAVED_REGISTER)
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/* Return the address in which frame FRAME's value of register REGNUM
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has been saved in memory. Or return zero if it has not been saved.
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If REGNUM specifies the SP, the value we return is actually
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the SP value, not an address where it was saved. */
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CORE_ADDR
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find_saved_register (frame, regnum)
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FRAME frame;
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int regnum;
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{
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struct frame_info *fi;
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struct frame_saved_regs saved_regs;
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register FRAME frame1 = 0;
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register CORE_ADDR addr = 0;
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if (frame == 0) /* No regs saved if want current frame */
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return 0;
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#ifdef HAVE_REGISTER_WINDOWS
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/* We assume that a register in a register window will only be saved
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in one place (since the name changes and/or disappears as you go
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towards inner frames), so we only call get_frame_saved_regs on
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the current frame. This is directly in contradiction to the
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usage below, which assumes that registers used in a frame must be
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saved in a lower (more interior) frame. This change is a result
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of working on a register window machine; get_frame_saved_regs
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always returns the registers saved within a frame, within the
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context (register namespace) of that frame. */
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/* However, note that we don't want this to return anything if
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nothing is saved (if there's a frame inside of this one). Also,
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callers to this routine asking for the stack pointer want the
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stack pointer saved for *this* frame; this is returned from the
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next frame. */
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if (REGISTER_IN_WINDOW_P(regnum))
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{
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frame1 = get_next_frame (frame);
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if (!frame1) return 0; /* Registers of this frame are
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active. */
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/* Get the SP from the next frame in; it will be this
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current frame. */
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if (regnum != SP_REGNUM)
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frame1 = frame;
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fi = get_frame_info (frame1);
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get_frame_saved_regs (fi, &saved_regs);
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return saved_regs.regs[regnum]; /* ... which might be zero */
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}
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#endif /* HAVE_REGISTER_WINDOWS */
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/* Note that this next routine assumes that registers used in
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frame x will be saved only in the frame that x calls and
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frames interior to it. This is not true on the sparc, but the
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above macro takes care of it, so we should be all right. */
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while (1)
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{
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QUIT;
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frame1 = get_prev_frame (frame1);
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if (frame1 == 0 || frame1 == frame)
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break;
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fi = get_frame_info (frame1);
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get_frame_saved_regs (fi, &saved_regs);
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if (saved_regs.regs[regnum])
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addr = saved_regs.regs[regnum];
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}
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return addr;
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}
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/* Find register number REGNUM relative to FRAME and put its (raw,
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target format) contents in *RAW_BUFFER. Set *OPTIMIZED if the
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variable was optimized out (and thus can't be fetched). Set *LVAL
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to lval_memory, lval_register, or not_lval, depending on whether
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the value was fetched from memory, from a register, or in a strange
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and non-modifiable way (e.g. a frame pointer which was calculated
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rather than fetched). Set *ADDRP to the address, either in memory
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on as a REGISTER_BYTE offset into the registers array.
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Note that this implementation never sets *LVAL to not_lval. But
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it can be replaced by defining GET_SAVED_REGISTER and supplying
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your own.
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The argument RAW_BUFFER must point to aligned memory. */
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void
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get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
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char *raw_buffer;
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int *optimized;
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CORE_ADDR *addrp;
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FRAME frame;
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int regnum;
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enum lval_type *lval;
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{
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CORE_ADDR addr;
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/* Normal systems don't optimize out things with register numbers. */
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if (optimized != NULL)
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*optimized = 0;
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addr = find_saved_register (frame, regnum);
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if (addr != 0)
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{
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if (lval != NULL)
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*lval = lval_memory;
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if (regnum == SP_REGNUM)
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{
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if (raw_buffer != NULL)
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{
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*(CORE_ADDR *)raw_buffer = addr;
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/* Put it back in target byte order. */
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SWAP_TARGET_AND_HOST (raw_buffer, sizeof (CORE_ADDR));
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}
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if (addrp != NULL)
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*addrp = 0;
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return;
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}
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if (raw_buffer != NULL)
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read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
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}
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else
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{
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if (lval != NULL)
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*lval = lval_register;
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addr = REGISTER_BYTE (regnum);
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if (raw_buffer != NULL)
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read_register_gen (regnum, raw_buffer);
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}
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if (addrp != NULL)
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*addrp = addr;
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}
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#endif /* GET_SAVED_REGISTER. */
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/* Copy the bytes of register REGNUM, relative to the current stack frame,
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into our memory at MYADDR, in target byte order.
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The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
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Returns 1 if could not be read, 0 if could. */
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int
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read_relative_register_raw_bytes (regnum, myaddr)
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int regnum;
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char *myaddr;
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{
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int optim;
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if (regnum == FP_REGNUM && selected_frame)
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{
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memcpy (myaddr, &FRAME_FP(selected_frame), REGISTER_RAW_SIZE(FP_REGNUM));
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SWAP_TARGET_AND_HOST (myaddr, REGISTER_RAW_SIZE(FP_REGNUM)); /* in target order */
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return 0;
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}
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get_saved_register (myaddr, &optim, (CORE_ADDR *) NULL, selected_frame,
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regnum, (enum lval_type *)NULL);
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return optim;
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}
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/* Return a `value' with the contents of register REGNUM
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in its virtual format, with the type specified by
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REGISTER_VIRTUAL_TYPE. */
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value
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value_of_register (regnum)
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int regnum;
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{
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CORE_ADDR addr;
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int optim;
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register value val;
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char raw_buffer[MAX_REGISTER_RAW_SIZE];
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char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
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enum lval_type lval;
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get_saved_register (raw_buffer, &optim, &addr,
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selected_frame, regnum, &lval);
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REGISTER_CONVERT_TO_VIRTUAL (regnum, raw_buffer, virtual_buffer);
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val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
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memcpy (VALUE_CONTENTS_RAW (val), virtual_buffer,
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REGISTER_VIRTUAL_SIZE (regnum));
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VALUE_LVAL (val) = lval;
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VALUE_ADDRESS (val) = addr;
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VALUE_REGNO (val) = regnum;
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VALUE_OPTIMIZED_OUT (val) = optim;
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return val;
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}
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/* Low level examining and depositing of registers.
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The caller is responsible for making
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sure that the inferior is stopped before calling the fetching routines,
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or it will get garbage. (a change from GDB version 3, in which
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the caller got the value from the last stop). */
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/* Contents of the registers in target byte order.
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We allocate some extra slop since we do a lot of bcopy's around `registers',
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and failing-soft is better than failing hard. */
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char registers[REGISTER_BYTES + /* SLOP */ 256];
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/* Nonzero if that register has been fetched. */
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char register_valid[NUM_REGS];
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/* Indicate that registers may have changed, so invalidate the cache. */
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void
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registers_changed ()
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{
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int i;
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for (i = 0; i < NUM_REGS; i++)
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register_valid[i] = 0;
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}
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/* Indicate that all registers have been fetched, so mark them all valid. */
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void
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registers_fetched ()
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{
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int i;
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for (i = 0; i < NUM_REGS; i++)
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register_valid[i] = 1;
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}
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/* Copy LEN bytes of consecutive data from registers
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starting with the REGBYTE'th byte of register data
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into memory at MYADDR. */
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void
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read_register_bytes (regbyte, myaddr, len)
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int regbyte;
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char *myaddr;
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int len;
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{
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/* Fetch all registers. */
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int i;
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for (i = 0; i < NUM_REGS; i++)
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if (!register_valid[i])
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{
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target_fetch_registers (-1);
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break;
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}
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if (myaddr != NULL)
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memcpy (myaddr, ®isters[regbyte], len);
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}
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/* Read register REGNO into memory at MYADDR, which must be large enough
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for REGISTER_RAW_BYTES (REGNO). Target byte-order.
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If the register is known to be the size of a CORE_ADDR or smaller,
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read_register can be used instead. */
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void
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read_register_gen (regno, myaddr)
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int regno;
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char *myaddr;
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{
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if (!register_valid[regno])
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target_fetch_registers (regno);
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memcpy (myaddr, ®isters[REGISTER_BYTE (regno)],
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REGISTER_RAW_SIZE (regno));
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}
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/* Copy LEN bytes of consecutive data from memory at MYADDR
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into registers starting with the REGBYTE'th byte of register data. */
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void
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write_register_bytes (regbyte, myaddr, len)
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int regbyte;
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char *myaddr;
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int len;
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{
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/* Make sure the entire registers array is valid. */
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read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
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memcpy (®isters[regbyte], myaddr, len);
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target_store_registers (-1);
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}
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/* Return the contents of register REGNO, regarding it as an integer. */
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/* FIXME, this loses when the REGISTER_VIRTUAL (REGNO) is true. Also,
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why is the return type CORE_ADDR rather than some integer type? */
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CORE_ADDR
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read_register (regno)
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int regno;
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{
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unsigned short sval;
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unsigned int ival;
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unsigned long lval;
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LONGEST llval;
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int size;
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if (!register_valid[regno])
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target_fetch_registers (regno);
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size = REGISTER_RAW_SIZE(regno);
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if (size == sizeof (unsigned char))
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return registers[REGISTER_BYTE (regno)];
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else if (size == sizeof (sval))
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{
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memcpy (&sval, ®isters[REGISTER_BYTE (regno)], sizeof (sval));
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SWAP_TARGET_AND_HOST (&sval, sizeof (sval));
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return sval;
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}
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else if (size == sizeof (ival))
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{
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memcpy (&ival, ®isters[REGISTER_BYTE (regno)], sizeof (ival));
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SWAP_TARGET_AND_HOST (&ival, sizeof (ival));
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return ival;
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}
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else if (size == sizeof (lval))
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{
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memcpy (&lval, ®isters[REGISTER_BYTE (regno)], sizeof (lval));
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SWAP_TARGET_AND_HOST (&lval, sizeof (lval));
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return lval;
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}
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else if (size == sizeof (llval))
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{
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memcpy (&llval, ®isters[REGISTER_BYTE (regno)], sizeof (llval));
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SWAP_TARGET_AND_HOST (&llval, sizeof (llval));
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return llval;
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}
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else
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{
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error ("GDB Internal Error in read_register() for register %d, size %d",
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regno, REGISTER_RAW_SIZE(regno));
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}
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}
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/* Registers we shouldn't try to store. */
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#if !defined (CANNOT_STORE_REGISTER)
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#define CANNOT_STORE_REGISTER(regno) 0
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#endif
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/* Store VALUE in the register number REGNO, regarded as an integer. */
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/* FIXME, this loses when REGISTER_VIRTUAL (REGNO) is true. Also,
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shouldn't the val arg be a LONGEST or something? */
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void
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write_register (regno, val)
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int regno, val;
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{
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unsigned char cval;
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unsigned short sval;
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unsigned int ival;
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unsigned long lval;
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LONGEST llval;
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int size;
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PTR ptr;
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/* On the sparc, writing %g0 is a no-op, so we don't even want to change
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the registers array if something writes to this register. */
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if (CANNOT_STORE_REGISTER (regno))
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return;
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/* If we have a valid copy of the register, and new value == old value,
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then don't bother doing the actual store. */
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size = REGISTER_RAW_SIZE(regno);
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if (size == sizeof(cval))
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{
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ptr = (PTR) &cval;
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cval = val;
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}
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else if (size == sizeof(sval))
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{
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ptr = (PTR) &sval;
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sval = val;
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}
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else if (size == sizeof(ival))
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{
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ptr = (PTR) &ival;
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ival = val;
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}
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else if (size == sizeof(lval))
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{
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ptr = (PTR) &lval;
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lval = val;
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}
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else if (size == sizeof(llval))
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{
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ptr = (PTR) &llval;
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llval = val;
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}
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else
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{
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error ("GDB Internal Error in write_register() for register %d, size %d",
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regno, size);
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}
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SWAP_TARGET_AND_HOST (ptr, size);
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if (register_valid [regno])
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{
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if (memcmp (®isters[REGISTER_BYTE (regno)],
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ptr, size) == 0)
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return;
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}
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target_prepare_to_store ();
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memcpy (®isters[REGISTER_BYTE (regno)], ptr, size);
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register_valid [regno] = 1;
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target_store_registers (regno);
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}
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/* Record that register REGNO contains VAL.
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This is used when the value is obtained from the inferior or core dump,
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so there is no need to store the value there. */
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void
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supply_register (regno, val)
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int regno;
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char *val;
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{
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register_valid[regno] = 1;
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memcpy (®isters[REGISTER_BYTE (regno)], val, REGISTER_RAW_SIZE (regno));
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/* On some architectures, e.g. HPPA, there are a few stray bits in some
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registers, that the rest of the code would like to ignore. */
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#ifdef CLEAN_UP_REGISTER_VALUE
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CLEAN_UP_REGISTER_VALUE(regno, ®isters[REGISTER_BYTE(regno)]);
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#endif
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}
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/* Given a struct symbol for a variable,
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and a stack frame id, read the value of the variable
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and return a (pointer to a) struct value containing the value.
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If the variable cannot be found, return a zero pointer.
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If FRAME is NULL, use the selected_frame. */
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value
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read_var_value (var, frame)
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register struct symbol *var;
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FRAME frame;
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{
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register value v;
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struct frame_info *fi;
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struct type *type = SYMBOL_TYPE (var);
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CORE_ADDR addr;
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register int len;
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v = allocate_value (type);
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VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */
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len = TYPE_LENGTH (type);
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if (frame == 0) frame = selected_frame;
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switch (SYMBOL_CLASS (var))
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{
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case LOC_CONST:
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memcpy (VALUE_CONTENTS_RAW (v), &SYMBOL_VALUE (var), len);
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SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (v), len);
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VALUE_LVAL (v) = not_lval;
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return v;
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case LOC_LABEL:
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addr = SYMBOL_VALUE_ADDRESS (var);
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memcpy (VALUE_CONTENTS_RAW (v), &addr, len);
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SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (v), len);
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VALUE_LVAL (v) = not_lval;
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return v;
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case LOC_CONST_BYTES:
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{
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char *bytes_addr;
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bytes_addr = SYMBOL_VALUE_BYTES (var);
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memcpy (VALUE_CONTENTS_RAW (v), bytes_addr, len);
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VALUE_LVAL (v) = not_lval;
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return v;
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}
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case LOC_STATIC:
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addr = SYMBOL_VALUE_ADDRESS (var);
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break;
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case LOC_ARG:
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if (SYMBOL_BASEREG_VALID (var))
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{
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addr = FRAME_GET_BASEREG_VALUE (frame, SYMBOL_BASEREG (var));
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}
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else
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{
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fi = get_frame_info (frame);
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if (fi == NULL)
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return 0;
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addr = FRAME_ARGS_ADDRESS (fi);
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}
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if (!addr)
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{
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return 0;
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}
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addr += SYMBOL_VALUE (var);
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break;
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case LOC_REF_ARG:
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if (SYMBOL_BASEREG_VALID (var))
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{
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addr = FRAME_GET_BASEREG_VALUE (frame, SYMBOL_BASEREG (var));
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}
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else
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{
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fi = get_frame_info (frame);
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if (fi == NULL)
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return 0;
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addr = FRAME_ARGS_ADDRESS (fi);
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||
}
|
||
if (!addr)
|
||
{
|
||
return 0;
|
||
}
|
||
addr += SYMBOL_VALUE (var);
|
||
read_memory (addr, (char *) &addr, sizeof (CORE_ADDR));
|
||
break;
|
||
|
||
case LOC_LOCAL:
|
||
case LOC_LOCAL_ARG:
|
||
if (SYMBOL_BASEREG_VALID (var))
|
||
{
|
||
addr = FRAME_GET_BASEREG_VALUE (frame, SYMBOL_BASEREG (var));
|
||
}
|
||
else
|
||
{
|
||
fi = get_frame_info (frame);
|
||
if (fi == NULL)
|
||
return 0;
|
||
addr = FRAME_LOCALS_ADDRESS (fi);
|
||
}
|
||
addr += SYMBOL_VALUE (var);
|
||
break;
|
||
|
||
case LOC_TYPEDEF:
|
||
error ("Cannot look up value of a typedef");
|
||
break;
|
||
|
||
case LOC_BLOCK:
|
||
VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
|
||
return v;
|
||
|
||
case LOC_REGISTER:
|
||
case LOC_REGPARM:
|
||
case LOC_REGPARM_ADDR:
|
||
{
|
||
struct block *b;
|
||
|
||
if (frame == NULL)
|
||
return 0;
|
||
b = get_frame_block (frame);
|
||
|
||
v = value_from_register (type, SYMBOL_VALUE (var), frame);
|
||
|
||
if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR)
|
||
{
|
||
addr = *(CORE_ADDR *)VALUE_CONTENTS (v);
|
||
VALUE_LVAL (v) = lval_memory;
|
||
}
|
||
else
|
||
return v;
|
||
}
|
||
break;
|
||
|
||
case LOC_OPTIMIZED_OUT:
|
||
VALUE_LVAL (v) = not_lval;
|
||
VALUE_OPTIMIZED_OUT (v) = 1;
|
||
return v;
|
||
|
||
default:
|
||
error ("Cannot look up value of a botched symbol.");
|
||
break;
|
||
}
|
||
|
||
VALUE_ADDRESS (v) = addr;
|
||
VALUE_LAZY (v) = 1;
|
||
return v;
|
||
}
|
||
|
||
/* Return a value of type TYPE, stored in register REGNUM, in frame
|
||
FRAME. */
|
||
|
||
value
|
||
value_from_register (type, regnum, frame)
|
||
struct type *type;
|
||
int regnum;
|
||
FRAME frame;
|
||
{
|
||
char raw_buffer [MAX_REGISTER_RAW_SIZE];
|
||
char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
|
||
CORE_ADDR addr;
|
||
int optim;
|
||
value v = allocate_value (type);
|
||
int len = TYPE_LENGTH (type);
|
||
char *value_bytes = 0;
|
||
int value_bytes_copied = 0;
|
||
int num_storage_locs;
|
||
enum lval_type lval;
|
||
|
||
VALUE_REGNO (v) = regnum;
|
||
|
||
num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ?
|
||
((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 :
|
||
1);
|
||
|
||
if (num_storage_locs > 1
|
||
#ifdef GDB_TARGET_IS_H8500
|
||
|| TYPE_CODE (type) == TYPE_CODE_PTR
|
||
#endif
|
||
)
|
||
{
|
||
/* Value spread across multiple storage locations. */
|
||
|
||
int local_regnum;
|
||
int mem_stor = 0, reg_stor = 0;
|
||
int mem_tracking = 1;
|
||
CORE_ADDR last_addr = 0;
|
||
CORE_ADDR first_addr;
|
||
|
||
value_bytes = (char *) alloca (len + MAX_REGISTER_RAW_SIZE);
|
||
|
||
/* Copy all of the data out, whereever it may be. */
|
||
|
||
#ifdef GDB_TARGET_IS_H8500
|
||
/* This piece of hideosity is required because the H8500 treats registers
|
||
differently depending upon whether they are used as pointers or not. As a
|
||
pointer, a register needs to have a page register tacked onto the front.
|
||
An alternate way to do this would be to have gcc output different register
|
||
numbers for the pointer & non-pointer form of the register. But, it
|
||
doesn't, so we're stuck with this. */
|
||
|
||
if (TYPE_CODE (type) == TYPE_CODE_PTR
|
||
&& len > 2)
|
||
{
|
||
int page_regnum;
|
||
|
||
switch (regnum)
|
||
{
|
||
case R0_REGNUM: case R1_REGNUM: case R2_REGNUM: case R3_REGNUM:
|
||
page_regnum = SEG_D_REGNUM;
|
||
break;
|
||
case R4_REGNUM: case R5_REGNUM:
|
||
page_regnum = SEG_E_REGNUM;
|
||
break;
|
||
case R6_REGNUM: case R7_REGNUM:
|
||
page_regnum = SEG_T_REGNUM;
|
||
break;
|
||
}
|
||
|
||
value_bytes[0] = 0;
|
||
get_saved_register (value_bytes + 1,
|
||
&optim,
|
||
&addr,
|
||
frame,
|
||
page_regnum,
|
||
&lval);
|
||
|
||
if (lval == lval_register)
|
||
reg_stor++;
|
||
else
|
||
mem_stor++;
|
||
first_addr = addr;
|
||
last_addr = addr;
|
||
|
||
get_saved_register (value_bytes + 2,
|
||
&optim,
|
||
&addr,
|
||
frame,
|
||
regnum,
|
||
&lval);
|
||
|
||
if (lval == lval_register)
|
||
reg_stor++;
|
||
else
|
||
{
|
||
mem_stor++;
|
||
mem_tracking = mem_tracking && (addr == last_addr);
|
||
}
|
||
last_addr = addr;
|
||
}
|
||
else
|
||
#endif /* GDB_TARGET_IS_H8500 */
|
||
for (local_regnum = regnum;
|
||
value_bytes_copied < len;
|
||
(value_bytes_copied += REGISTER_RAW_SIZE (local_regnum),
|
||
++local_regnum))
|
||
{
|
||
get_saved_register (value_bytes + value_bytes_copied,
|
||
&optim,
|
||
&addr,
|
||
frame,
|
||
local_regnum,
|
||
&lval);
|
||
|
||
if (regnum == local_regnum)
|
||
first_addr = addr;
|
||
if (lval == lval_register)
|
||
reg_stor++;
|
||
else
|
||
{
|
||
mem_stor++;
|
||
|
||
mem_tracking =
|
||
(mem_tracking
|
||
&& (regnum == local_regnum
|
||
|| addr == last_addr));
|
||
}
|
||
last_addr = addr;
|
||
}
|
||
|
||
if ((reg_stor && mem_stor)
|
||
|| (mem_stor && !mem_tracking))
|
||
/* Mixed storage; all of the hassle we just went through was
|
||
for some good purpose. */
|
||
{
|
||
VALUE_LVAL (v) = lval_reg_frame_relative;
|
||
VALUE_FRAME (v) = FRAME_FP (frame);
|
||
VALUE_FRAME_REGNUM (v) = regnum;
|
||
}
|
||
else if (mem_stor)
|
||
{
|
||
VALUE_LVAL (v) = lval_memory;
|
||
VALUE_ADDRESS (v) = first_addr;
|
||
}
|
||
else if (reg_stor)
|
||
{
|
||
VALUE_LVAL (v) = lval_register;
|
||
VALUE_ADDRESS (v) = first_addr;
|
||
}
|
||
else
|
||
fatal ("value_from_register: Value not stored anywhere!");
|
||
|
||
VALUE_OPTIMIZED_OUT (v) = optim;
|
||
|
||
/* Any structure stored in more than one register will always be
|
||
an integral number of registers. Otherwise, you'd need to do
|
||
some fiddling with the last register copied here for little
|
||
endian machines. */
|
||
|
||
/* Copy into the contents section of the value. */
|
||
memcpy (VALUE_CONTENTS_RAW (v), value_bytes, len);
|
||
|
||
/* Finally do any conversion necessary when extracting this
|
||
type from more than one register. */
|
||
#ifdef REGISTER_CONVERT_TO_TYPE
|
||
REGISTER_CONVERT_TO_TYPE(regnum, type, VALUE_CONTENTS_RAW(v));
|
||
#endif
|
||
return v;
|
||
}
|
||
|
||
/* Data is completely contained within a single register. Locate the
|
||
register's contents in a real register or in core;
|
||
read the data in raw format. */
|
||
|
||
get_saved_register (raw_buffer, &optim, &addr, frame, regnum, &lval);
|
||
VALUE_OPTIMIZED_OUT (v) = optim;
|
||
VALUE_LVAL (v) = lval;
|
||
VALUE_ADDRESS (v) = addr;
|
||
|
||
/* Convert the raw contents to virtual contents.
|
||
(Just copy them if the formats are the same.) */
|
||
|
||
REGISTER_CONVERT_TO_VIRTUAL (regnum, raw_buffer, virtual_buffer);
|
||
|
||
if (REGISTER_CONVERTIBLE (regnum))
|
||
{
|
||
/* When the raw and virtual formats differ, the virtual format
|
||
corresponds to a specific data type. If we want that type,
|
||
copy the data into the value.
|
||
Otherwise, do a type-conversion. */
|
||
|
||
if (type != REGISTER_VIRTUAL_TYPE (regnum))
|
||
{
|
||
/* eg a variable of type `float' in a 68881 register
|
||
with raw type `extended' and virtual type `double'.
|
||
Fetch it as a `double' and then convert to `float'. */
|
||
v = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
|
||
memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer, len);
|
||
v = value_cast (type, v);
|
||
}
|
||
else
|
||
memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer, len);
|
||
}
|
||
else
|
||
{
|
||
/* Raw and virtual formats are the same for this register. */
|
||
|
||
#if TARGET_BYTE_ORDER == BIG_ENDIAN
|
||
if (len < REGISTER_RAW_SIZE (regnum))
|
||
{
|
||
/* Big-endian, and we want less than full size. */
|
||
VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len;
|
||
}
|
||
#endif
|
||
|
||
memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer + VALUE_OFFSET (v), len);
|
||
}
|
||
|
||
return v;
|
||
}
|
||
|
||
/* Given a struct symbol for a variable or function,
|
||
and a stack frame id,
|
||
return a (pointer to a) struct value containing the properly typed
|
||
address. */
|
||
|
||
value
|
||
locate_var_value (var, frame)
|
||
register struct symbol *var;
|
||
FRAME frame;
|
||
{
|
||
CORE_ADDR addr = 0;
|
||
struct type *type = SYMBOL_TYPE (var);
|
||
value lazy_value;
|
||
|
||
/* Evaluate it first; if the result is a memory address, we're fine.
|
||
Lazy evaluation pays off here. */
|
||
|
||
lazy_value = read_var_value (var, frame);
|
||
if (lazy_value == 0)
|
||
error ("Address of \"%s\" is unknown.", SYMBOL_SOURCE_NAME (var));
|
||
|
||
if (VALUE_LAZY (lazy_value)
|
||
|| TYPE_CODE (type) == TYPE_CODE_FUNC)
|
||
{
|
||
addr = VALUE_ADDRESS (lazy_value);
|
||
return value_from_longest (lookup_pointer_type (type), (LONGEST) addr);
|
||
}
|
||
|
||
/* Not a memory address; check what the problem was. */
|
||
switch (VALUE_LVAL (lazy_value))
|
||
{
|
||
case lval_register:
|
||
case lval_reg_frame_relative:
|
||
error ("Address requested for identifier \"%s\" which is in a register.",
|
||
SYMBOL_SOURCE_NAME (var));
|
||
break;
|
||
|
||
default:
|
||
error ("Can't take address of \"%s\" which isn't an lvalue.",
|
||
SYMBOL_SOURCE_NAME (var));
|
||
break;
|
||
}
|
||
return 0; /* For lint -- never reached */
|
||
}
|