/* Find a variable's value in memory, for GDB, the GNU debugger.
- Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
+ Copyright 1986, 87, 89, 91, 94, 95, 96, 1998
+ Free Software Foundation, Inc.
-This file is part of GDB.
+ This file is part of GDB.
-GDB is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 1, or (at your option)
-any later version.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
-GDB is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
-#include <stdio.h>
#include "defs.h"
-#include "param.h"
#include "symtab.h"
+#include "gdbtypes.h"
#include "frame.h"
#include "value.h"
#include "gdbcore.h"
#include "inferior.h"
#include "target.h"
+#include "gdb_string.h"
+#include "floatformat.h"
+#include "symfile.h" /* for overlay functions */
-#if !defined (GET_SAVED_REGISTER)
+/* This is used to indicate that we don't know the format of the floating point
+ number. Typically, this is useful for native ports, where the actual format
+ is irrelevant, since no conversions will be taking place. */
+
+const struct floatformat floatformat_unknown;
+
+/* Registers we shouldn't try to store. */
+#if !defined (CANNOT_STORE_REGISTER)
+#define CANNOT_STORE_REGISTER(regno) 0
+#endif
+
+static void write_register_gen PARAMS ((int, char *));
+
+static int read_relative_register_raw_bytes_for_frame PARAMS ((int regnum, char *myaddr, struct frame_info * frame));
+
+/* Basic byte-swapping routines. GDB has needed these for a long time...
+ All extract a target-format integer at ADDR which is LEN bytes long. */
+
+#if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8
+ /* 8 bit characters are a pretty safe assumption these days, so we
+ assume it throughout all these swapping routines. If we had to deal with
+ 9 bit characters, we would need to make len be in bits and would have
+ to re-write these routines... */
+you lose
+#endif
+
+ LONGEST
+extract_signed_integer (addr, len)
+ PTR addr;
+ int len;
+{
+ LONGEST retval;
+ unsigned char *p;
+ unsigned char *startaddr = (unsigned char *) addr;
+ unsigned char *endaddr = startaddr + len;
+
+ if (len > (int) sizeof (LONGEST))
+ error ("\
+That operation is not available on integers of more than %d bytes.",
+ sizeof (LONGEST));
+
+ /* Start at the most significant end of the integer, and work towards
+ the least significant. */
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ {
+ p = startaddr;
+ /* Do the sign extension once at the start. */
+ retval = ((LONGEST) * p ^ 0x80) - 0x80;
+ for (++p; p < endaddr; ++p)
+ retval = (retval << 8) | *p;
+ }
+ else
+ {
+ p = endaddr - 1;
+ /* Do the sign extension once at the start. */
+ retval = ((LONGEST) * p ^ 0x80) - 0x80;
+ for (--p; p >= startaddr; --p)
+ retval = (retval << 8) | *p;
+ }
+ return retval;
+}
+
+ULONGEST
+extract_unsigned_integer (addr, len)
+ PTR addr;
+ int len;
+{
+ ULONGEST retval;
+ unsigned char *p;
+ unsigned char *startaddr = (unsigned char *) addr;
+ unsigned char *endaddr = startaddr + len;
+
+ if (len > (int) sizeof (ULONGEST))
+ error ("\
+That operation is not available on integers of more than %d bytes.",
+ sizeof (ULONGEST));
+
+ /* Start at the most significant end of the integer, and work towards
+ the least significant. */
+ retval = 0;
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ {
+ for (p = startaddr; p < endaddr; ++p)
+ retval = (retval << 8) | *p;
+ }
+ else
+ {
+ for (p = endaddr - 1; p >= startaddr; --p)
+ retval = (retval << 8) | *p;
+ }
+ return retval;
+}
+
+/* Sometimes a long long unsigned integer can be extracted as a
+ LONGEST value. This is done so that we can print these values
+ better. If this integer can be converted to a LONGEST, this
+ function returns 1 and sets *PVAL. Otherwise it returns 0. */
+
+int
+extract_long_unsigned_integer (addr, orig_len, pval)
+ PTR addr;
+ int orig_len;
+ LONGEST *pval;
+{
+ char *p, *first_addr;
+ int len;
+
+ len = orig_len;
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ {
+ for (p = (char *) addr;
+ len > (int) sizeof (LONGEST) && p < (char *) addr + orig_len;
+ p++)
+ {
+ if (*p == 0)
+ len--;
+ else
+ break;
+ }
+ first_addr = p;
+ }
+ else
+ {
+ first_addr = (char *) addr;
+ for (p = (char *) addr + orig_len - 1;
+ len > (int) sizeof (LONGEST) && p >= (char *) addr;
+ p--)
+ {
+ if (*p == 0)
+ len--;
+ else
+ break;
+ }
+ }
+
+ if (len <= (int) sizeof (LONGEST))
+ {
+ *pval = (LONGEST) extract_unsigned_integer (first_addr,
+ sizeof (LONGEST));
+ return 1;
+ }
+
+ return 0;
+}
+
+CORE_ADDR
+extract_address (addr, len)
+ PTR addr;
+ int len;
+{
+ /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
+ whether we want this to be true eventually. */
+ return (CORE_ADDR) extract_unsigned_integer (addr, len);
+}
+
+void
+store_signed_integer (addr, len, val)
+ PTR addr;
+ int len;
+ LONGEST val;
+{
+ unsigned char *p;
+ unsigned char *startaddr = (unsigned char *) addr;
+ unsigned char *endaddr = startaddr + len;
+
+ /* Start at the least significant end of the integer, and work towards
+ the most significant. */
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ {
+ for (p = endaddr - 1; p >= startaddr; --p)
+ {
+ *p = val & 0xff;
+ val >>= 8;
+ }
+ }
+ else
+ {
+ for (p = startaddr; p < endaddr; ++p)
+ {
+ *p = val & 0xff;
+ val >>= 8;
+ }
+ }
+}
+
+void
+store_unsigned_integer (addr, len, val)
+ PTR addr;
+ int len;
+ ULONGEST val;
+{
+ unsigned char *p;
+ unsigned char *startaddr = (unsigned char *) addr;
+ unsigned char *endaddr = startaddr + len;
+
+ /* Start at the least significant end of the integer, and work towards
+ the most significant. */
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ {
+ for (p = endaddr - 1; p >= startaddr; --p)
+ {
+ *p = val & 0xff;
+ val >>= 8;
+ }
+ }
+ else
+ {
+ for (p = startaddr; p < endaddr; ++p)
+ {
+ *p = val & 0xff;
+ val >>= 8;
+ }
+ }
+}
+
+/* Store the literal address "val" into
+ gdb-local memory pointed to by "addr"
+ for "len" bytes. */
+void
+store_address (addr, len, val)
+ PTR addr;
+ int len;
+ LONGEST val;
+{
+ store_unsigned_integer (addr, len, val);
+}
+\f
+/* Extract a floating-point number from a target-order byte-stream at ADDR.
+ Returns the value as type DOUBLEST.
+
+ If the host and target formats agree, we just copy the raw data into the
+ appropriate type of variable and return, letting the host increase precision
+ as necessary. Otherwise, we call the conversion routine and let it do the
+ dirty work. */
+
+DOUBLEST
+extract_floating (addr, len)
+ PTR addr;
+ int len;
+{
+ DOUBLEST dretval;
+
+ if (len == sizeof (float))
+ {
+ if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
+ {
+ float retval;
+
+ memcpy (&retval, addr, sizeof (retval));
+ return retval;
+ }
+ else
+ floatformat_to_doublest (TARGET_FLOAT_FORMAT, addr, &dretval);
+ }
+ else if (len == sizeof (double))
+ {
+ if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
+ {
+ double retval;
+
+ memcpy (&retval, addr, sizeof (retval));
+ return retval;
+ }
+ else
+ floatformat_to_doublest (TARGET_DOUBLE_FORMAT, addr, &dretval);
+ }
+ else if (len == sizeof (DOUBLEST))
+ {
+ if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
+ {
+ DOUBLEST retval;
+
+ memcpy (&retval, addr, sizeof (retval));
+ return retval;
+ }
+ else
+ floatformat_to_doublest (TARGET_LONG_DOUBLE_FORMAT, addr, &dretval);
+ }
+#ifdef TARGET_EXTRACT_FLOATING
+ else if (TARGET_EXTRACT_FLOATING (addr, len, &dretval))
+ return dretval;
+#endif
+ else
+ {
+ error ("Can't deal with a floating point number of %d bytes.", len);
+ }
+
+ return dretval;
+}
+
+void
+store_floating (addr, len, val)
+ PTR addr;
+ int len;
+ DOUBLEST val;
+{
+ if (len == sizeof (float))
+ {
+ if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
+ {
+ float floatval = val;
+
+ memcpy (addr, &floatval, sizeof (floatval));
+ }
+ else
+ floatformat_from_doublest (TARGET_FLOAT_FORMAT, &val, addr);
+ }
+ else if (len == sizeof (double))
+ {
+ if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
+ {
+ double doubleval = val;
+
+ memcpy (addr, &doubleval, sizeof (doubleval));
+ }
+ else
+ floatformat_from_doublest (TARGET_DOUBLE_FORMAT, &val, addr);
+ }
+ else if (len == sizeof (DOUBLEST))
+ {
+ if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
+ memcpy (addr, &val, sizeof (val));
+ else
+ floatformat_from_doublest (TARGET_LONG_DOUBLE_FORMAT, &val, addr);
+ }
+#ifdef TARGET_STORE_FLOATING
+ else if (TARGET_STORE_FLOATING (addr, len, val))
+ return;
+#endif
+ else
+ {
+ error ("Can't deal with a floating point number of %d bytes.", len);
+ }
+}
+\f
/* Return the address in which frame FRAME's value of register REGNUM
has been saved in memory. Or return zero if it has not been saved.
CORE_ADDR
find_saved_register (frame, regnum)
- FRAME frame;
+ struct frame_info *frame;
int regnum;
{
- struct frame_info *fi;
- struct frame_saved_regs saved_regs;
-
- register FRAME frame1 = 0;
+ register struct frame_info *frame1 = NULL;
register CORE_ADDR addr = 0;
- if (frame == 0) /* No regs saved if want current frame */
+ if (frame == NULL) /* No regs saved if want current frame */
return 0;
#ifdef HAVE_REGISTER_WINDOWS
callers to this routine asking for the stack pointer want the
stack pointer saved for *this* frame; this is returned from the
next frame. */
-
- if (REGISTER_IN_WINDOW_P(regnum))
+ if (REGISTER_IN_WINDOW_P (regnum))
{
frame1 = get_next_frame (frame);
- if (!frame1) return 0; /* Registers of this frame are
- active. */
-
+ if (!frame1)
+ return 0; /* Registers of this frame are active. */
+
/* Get the SP from the next frame in; it will be this
- current frame. */
+ current frame. */
if (regnum != SP_REGNUM)
- frame1 = frame;
-
- fi = get_frame_info (frame1);
- get_frame_saved_regs (fi, &saved_regs);
- return saved_regs.regs[regnum]; /* ... which might be zero */
+ frame1 = frame;
+
+ FRAME_INIT_SAVED_REGS (frame1);
+ return frame1->saved_regs[regnum]; /* ... which might be zero */
}
#endif /* HAVE_REGISTER_WINDOWS */
frame1 = get_prev_frame (frame1);
if (frame1 == 0 || frame1 == frame)
break;
- fi = get_frame_info (frame1);
- get_frame_saved_regs (fi, &saved_regs);
- if (saved_regs.regs[regnum])
- addr = saved_regs.regs[regnum];
+ FRAME_INIT_SAVED_REGS (frame1);
+ if (frame1->saved_regs[regnum])
+ addr = frame1->saved_regs[regnum];
}
return addr;
}
-/* Find register number REGNUM relative to FRAME and put its
- (raw) contents in *RAW_BUFFER. Set *OPTIMIZED if the variable
- was optimized out (and thus can't be fetched). Set *LVAL to
- lval_memory, lval_register, or not_lval, depending on whether the
- value was fetched from memory, from a register, or in a strange
+/* Find register number REGNUM relative to FRAME and put its (raw,
+ target format) contents in *RAW_BUFFER. Set *OPTIMIZED if the
+ variable was optimized out (and thus can't be fetched). Set *LVAL
+ to lval_memory, lval_register, or not_lval, depending on whether
+ the value was fetched from memory, from a register, or in a strange
and non-modifiable way (e.g. a frame pointer which was calculated
rather than fetched). Set *ADDRP to the address, either in memory
on as a REGISTER_BYTE offset into the registers array.
your own.
The argument RAW_BUFFER must point to aligned memory. */
+
void
-get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
+default_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
char *raw_buffer;
int *optimized;
CORE_ADDR *addrp;
- FRAME frame;
+ struct frame_info *frame;
int regnum;
enum lval_type *lval;
{
CORE_ADDR addr;
+
+ if (!target_has_registers)
+ error ("No registers.");
+
/* Normal systems don't optimize out things with register numbers. */
if (optimized != NULL)
*optimized = 0;
addr = find_saved_register (frame, regnum);
- if (addr != NULL)
+ if (addr != 0)
{
if (lval != NULL)
*lval = lval_memory;
if (regnum == SP_REGNUM)
{
if (raw_buffer != NULL)
- *(CORE_ADDR *)raw_buffer = addr;
+ {
+ /* Put it back in target format. */
+ store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), (LONGEST) addr);
+ }
if (addrp != NULL)
*addrp = 0;
return;
if (addrp != NULL)
*addrp = addr;
}
-#endif /* GET_SAVED_REGISTER. */
-/* Copy the bytes of register REGNUM, relative to the current stack frame,
- into our memory at MYADDR, in target byte order.
- The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
+#if !defined (GET_SAVED_REGISTER)
+#define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \
+ default_get_saved_register(raw_buffer, optimized, addrp, frame, regnum, lval)
+#endif
+void
+get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
+ char *raw_buffer;
+ int *optimized;
+ CORE_ADDR *addrp;
+ struct frame_info *frame;
+ int regnum;
+ enum lval_type *lval;
+{
+ GET_SAVED_REGISTER (raw_buffer, optimized, addrp, frame, regnum, lval);
+}
+
+/* Copy the bytes of register REGNUM, relative to the input stack frame,
+ into our memory at MYADDR, in target byte order.
+ The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
+
+ Returns 1 if could not be read, 0 if could. */
+
+static int
+read_relative_register_raw_bytes_for_frame (regnum, myaddr, frame)
+ int regnum;
+ char *myaddr;
+ struct frame_info *frame;
+{
+ int optim;
+ if (regnum == FP_REGNUM && frame)
+ {
+ /* Put it back in target format. */
+ store_address (myaddr, REGISTER_RAW_SIZE (FP_REGNUM),
+ (LONGEST) FRAME_FP (frame));
+
+ return 0;
+ }
+
+ get_saved_register (myaddr, &optim, (CORE_ADDR *) NULL, frame,
+ regnum, (enum lval_type *) NULL);
+
+ if (register_valid[regnum] < 0)
+ return 1; /* register value not available */
+
+ return optim;
+}
+
+/* Copy the bytes of register REGNUM, relative to the current stack frame,
+ into our memory at MYADDR, in target byte order.
+ The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
+
+ Returns 1 if could not be read, 0 if could. */
+
+int
+read_relative_register_raw_bytes (regnum, myaddr)
+ int regnum;
+ char *myaddr;
+{
+ return read_relative_register_raw_bytes_for_frame (regnum, myaddr,
+ selected_frame);
+}
+
+/* Return a `value' with the contents of register REGNUM
+ in its virtual format, with the type specified by
+ REGISTER_VIRTUAL_TYPE.
+
+ NOTE: returns NULL if register value is not available.
+ Caller will check return value or die! */
+
+value_ptr
+value_of_register (regnum)
+ int regnum;
+{
+ CORE_ADDR addr;
+ int optim;
+ register value_ptr reg_val;
+ char raw_buffer[MAX_REGISTER_RAW_SIZE];
+ enum lval_type lval;
+
+ get_saved_register (raw_buffer, &optim, &addr,
+ selected_frame, regnum, &lval);
+
+ if (register_valid[regnum] < 0)
+ return NULL; /* register value not available */
+
+ reg_val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
+
+ /* Convert raw data to virtual format if necessary. */
+
+ if (REGISTER_CONVERTIBLE (regnum))
+ {
+ REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum),
+ raw_buffer, VALUE_CONTENTS_RAW (reg_val));
+ }
+ else if (REGISTER_RAW_SIZE (regnum) == REGISTER_VIRTUAL_SIZE (regnum))
+ memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer,
+ REGISTER_RAW_SIZE (regnum));
+ else
+ internal_error ("Register \"%s\" (%d) has conflicting raw (%d) and virtual (%d) size",
+ REGISTER_NAME (regnum),
+ regnum,
+ REGISTER_RAW_SIZE (regnum),
+ REGISTER_VIRTUAL_SIZE (regnum));
+ VALUE_LVAL (reg_val) = lval;
+ VALUE_ADDRESS (reg_val) = addr;
+ VALUE_REGNO (reg_val) = regnum;
+ VALUE_OPTIMIZED_OUT (reg_val) = optim;
+ return reg_val;
+}
+\f
+/* Low level examining and depositing of registers.
+
+ The caller is responsible for making
+ sure that the inferior is stopped before calling the fetching routines,
+ or it will get garbage. (a change from GDB version 3, in which
+ the caller got the value from the last stop). */
+
+/* Contents and state of the registers (in target byte order). */
+
+char *registers;
+
+/* VALID_REGISTER is non-zero if it has been fetched, -1 if the
+ register value was not available. */
+
+signed char *register_valid;
+
+/* The thread/process associated with the current set of registers. For now,
+ -1 is special, and means `no current process'. */
+int registers_pid = -1;
+
+/* Indicate that registers may have changed, so invalidate the cache. */
+
+void
+registers_changed ()
+{
+ int i;
+ int numregs = ARCH_NUM_REGS;
+
+ registers_pid = -1;
+
+ /* Force cleanup of any alloca areas if using C alloca instead of
+ a builtin alloca. This particular call is used to clean up
+ areas allocated by low level target code which may build up
+ during lengthy interactions between gdb and the target before
+ gdb gives control to the user (ie watchpoints). */
+ alloca (0);
+
+ for (i = 0; i < numregs; i++)
+ register_valid[i] = 0;
+
+ if (registers_changed_hook)
+ registers_changed_hook ();
+}
+
+/* Indicate that all registers have been fetched, so mark them all valid. */
+void
+registers_fetched ()
+{
+ int i;
+ int numregs = ARCH_NUM_REGS;
+ for (i = 0; i < numregs; i++)
+ register_valid[i] = 1;
+}
+
+/* read_register_bytes and write_register_bytes are generally a *BAD*
+ idea. They are inefficient because they need to check for partial
+ updates, which can only be done by scanning through all of the
+ registers and seeing if the bytes that are being read/written fall
+ inside of an invalid register. [The main reason this is necessary
+ is that register sizes can vary, so a simple index won't suffice.]
+ It is far better to call read_register_gen and write_register_gen
+ if you want to get at the raw register contents, as it only takes a
+ regno as an argument, and therefore can't do a partial register
+ update.
+
+ Prior to the recent fixes to check for partial updates, both read
+ and write_register_bytes always checked to see if any registers
+ were stale, and then called target_fetch_registers (-1) to update
+ the whole set. This caused really slowed things down for remote
+ targets. */
+
+/* Copy INLEN bytes of consecutive data from registers
+ starting with the INREGBYTE'th byte of register data
+ into memory at MYADDR. */
+
+void
+read_register_bytes (inregbyte, myaddr, inlen)
+ int inregbyte;
+ char *myaddr;
+ int inlen;
+{
+ int inregend = inregbyte + inlen;
+ int regno;
+
+ if (registers_pid != inferior_pid)
+ {
+ registers_changed ();
+ registers_pid = inferior_pid;
+ }
+
+ /* See if we are trying to read bytes from out-of-date registers. If so,
+ update just those registers. */
+
+ for (regno = 0; regno < NUM_REGS; regno++)
+ {
+ int regstart, regend;
+
+ if (register_valid[regno])
+ continue;
+
+ if (REGISTER_NAME (regno) == NULL || *REGISTER_NAME (regno) == '\0')
+ continue;
+
+ regstart = REGISTER_BYTE (regno);
+ regend = regstart + REGISTER_RAW_SIZE (regno);
+
+ if (regend <= inregbyte || inregend <= regstart)
+ /* The range the user wants to read doesn't overlap with regno. */
+ continue;
+
+ /* We've found an invalid register where at least one byte will be read.
+ Update it from the target. */
+ target_fetch_registers (regno);
+
+ if (!register_valid[regno])
+ error ("read_register_bytes: Couldn't update register %d.", regno);
+ }
+
+ if (myaddr != NULL)
+ memcpy (myaddr, ®isters[inregbyte], inlen);
+}
+
+/* Read register REGNO into memory at MYADDR, which must be large enough
+ for REGISTER_RAW_BYTES (REGNO). Target byte-order.
+ If the register is known to be the size of a CORE_ADDR or smaller,
+ read_register can be used instead. */
+void
+read_register_gen (regno, myaddr)
+ int regno;
+ char *myaddr;
+{
+ if (registers_pid != inferior_pid)
+ {
+ registers_changed ();
+ registers_pid = inferior_pid;
+ }
+
+ if (!register_valid[regno])
+ target_fetch_registers (regno);
+ memcpy (myaddr, ®isters[REGISTER_BYTE (regno)],
+ REGISTER_RAW_SIZE (regno));
+}
+
+/* Write register REGNO at MYADDR to the target. MYADDR points at
+ REGISTER_RAW_BYTES(REGNO), which must be in target byte-order. */
+
+static void
+write_register_gen (regno, myaddr)
+ int regno;
+ char *myaddr;
+{
+ int size;
+
+ /* On the sparc, writing %g0 is a no-op, so we don't even want to change
+ the registers array if something writes to this register. */
+ if (CANNOT_STORE_REGISTER (regno))
+ return;
+
+ if (registers_pid != inferior_pid)
+ {
+ registers_changed ();
+ registers_pid = inferior_pid;
+ }
+
+ size = REGISTER_RAW_SIZE (regno);
+
+ /* If we have a valid copy of the register, and new value == old value,
+ then don't bother doing the actual store. */
+
+ if (register_valid[regno]
+ && memcmp (®isters[REGISTER_BYTE (regno)], myaddr, size) == 0)
+ return;
+
+ target_prepare_to_store ();
+
+ memcpy (®isters[REGISTER_BYTE (regno)], myaddr, size);
+
+ register_valid[regno] = 1;
+
+ target_store_registers (regno);
+}
+
+/* Copy INLEN bytes of consecutive data from memory at MYADDR
+ into registers starting with the MYREGSTART'th byte of register data. */
+
+void
+write_register_bytes (myregstart, myaddr, inlen)
+ int myregstart;
+ char *myaddr;
+ int inlen;
+{
+ int myregend = myregstart + inlen;
+ int regno;
+
+ target_prepare_to_store ();
+
+ /* Scan through the registers updating any that are covered by the range
+ myregstart<=>myregend using write_register_gen, which does nice things
+ like handling threads, and avoiding updates when the new and old contents
+ are the same. */
+
+ for (regno = 0; regno < NUM_REGS; regno++)
+ {
+ int regstart, regend;
+
+ regstart = REGISTER_BYTE (regno);
+ regend = regstart + REGISTER_RAW_SIZE (regno);
+
+ /* Is this register completely outside the range the user is writing? */
+ if (myregend <= regstart || regend <= myregstart)
+ /* do nothing */ ;
+
+ /* Is this register completely within the range the user is writing? */
+ else if (myregstart <= regstart && regend <= myregend)
+ write_register_gen (regno, myaddr + (regstart - myregstart));
+
+ /* The register partially overlaps the range being written. */
+ else
+ {
+ char regbuf[MAX_REGISTER_RAW_SIZE];
+ /* What's the overlap between this register's bytes and
+ those the caller wants to write? */
+ int overlapstart = max (regstart, myregstart);
+ int overlapend = min (regend, myregend);
+
+ /* We may be doing a partial update of an invalid register.
+ Update it from the target before scribbling on it. */
+ read_register_gen (regno, regbuf);
+
+ memcpy (registers + overlapstart,
+ myaddr + (overlapstart - myregstart),
+ overlapend - overlapstart);
+
+ target_store_registers (regno);
+ }
+ }
+}
+
+
+/* Return the raw contents of register REGNO, regarding it as an integer. */
+/* This probably should be returning LONGEST rather than CORE_ADDR. */
+
+CORE_ADDR
+read_register (regno)
+ int regno;
+{
+ if (registers_pid != inferior_pid)
+ {
+ registers_changed ();
+ registers_pid = inferior_pid;
+ }
+
+ if (!register_valid[regno])
+ target_fetch_registers (regno);
+
+ return (CORE_ADDR) extract_address (®isters[REGISTER_BYTE (regno)],
+ REGISTER_RAW_SIZE (regno));
+}
+
+CORE_ADDR
+read_register_pid (regno, pid)
+ int regno, pid;
+{
+ int save_pid;
+ CORE_ADDR retval;
+
+ if (pid == inferior_pid)
+ return read_register (regno);
+
+ save_pid = inferior_pid;
+
+ inferior_pid = pid;
+
+ retval = read_register (regno);
+
+ inferior_pid = save_pid;
+
+ return retval;
+}
+
+/* Store VALUE, into the raw contents of register number REGNO.
+ This should probably write a LONGEST rather than a CORE_ADDR */
+
+void
+write_register (regno, val)
+ int regno;
+ LONGEST val;
+{
+ PTR buf;
+ int size;
+
+ /* On the sparc, writing %g0 is a no-op, so we don't even want to change
+ the registers array if something writes to this register. */
+ if (CANNOT_STORE_REGISTER (regno))
+ return;
+
+ if (registers_pid != inferior_pid)
+ {
+ registers_changed ();
+ registers_pid = inferior_pid;
+ }
+
+ size = REGISTER_RAW_SIZE (regno);
+ buf = alloca (size);
+ store_signed_integer (buf, size, (LONGEST) val);
+
+ /* If we have a valid copy of the register, and new value == old value,
+ then don't bother doing the actual store. */
+
+ if (register_valid[regno]
+ && memcmp (®isters[REGISTER_BYTE (regno)], buf, size) == 0)
+ return;
+
+ target_prepare_to_store ();
+
+ memcpy (®isters[REGISTER_BYTE (regno)], buf, size);
+
+ register_valid[regno] = 1;
+
+ target_store_registers (regno);
+}
+
+void
+write_register_pid (regno, val, pid)
+ int regno;
+ CORE_ADDR val;
+ int pid;
+{
+ int save_pid;
+
+ if (pid == inferior_pid)
+ {
+ write_register (regno, val);
+ return;
+ }
+
+ save_pid = inferior_pid;
+
+ inferior_pid = pid;
+
+ write_register (regno, val);
+
+ inferior_pid = save_pid;
+}
+
+/* Record that register REGNO contains VAL.
+ This is used when the value is obtained from the inferior or core dump,
+ so there is no need to store the value there.
- Returns 1 if could not be read, 0 if could. */
+ If VAL is a NULL pointer, then it's probably an unsupported register. We
+ just set it's value to all zeros. We might want to record this fact, and
+ report it to the users of read_register and friends.
+ */
-int
-read_relative_register_raw_bytes (regnum, myaddr)
- int regnum;
- char *myaddr;
+void
+supply_register (regno, val)
+ int regno;
+ char *val;
{
- int optim;
- if (regnum == FP_REGNUM && selected_frame)
+#if 1
+ if (registers_pid != inferior_pid)
{
- bcopy (&FRAME_FP(selected_frame), myaddr, sizeof (CORE_ADDR));
- SWAP_TARGET_AND_HOST (myaddr, sizeof (CORE_ADDR)); /* in target order */
- return 0;
+ registers_changed ();
+ registers_pid = inferior_pid;
}
+#endif
- get_saved_register (myaddr, &optim, (CORE_ADDR *) NULL, selected_frame,
- regnum, (enum lval_type *)NULL);
- return optim;
+ register_valid[regno] = 1;
+ if (val)
+ memcpy (®isters[REGISTER_BYTE (regno)], val, REGISTER_RAW_SIZE (regno));
+ else
+ memset (®isters[REGISTER_BYTE (regno)], '\000', REGISTER_RAW_SIZE (regno));
+
+ /* On some architectures, e.g. HPPA, there are a few stray bits in some
+ registers, that the rest of the code would like to ignore. */
+#ifdef CLEAN_UP_REGISTER_VALUE
+ CLEAN_UP_REGISTER_VALUE (regno, ®isters[REGISTER_BYTE (regno)]);
+#endif
}
-/* Return a `value' with the contents of register REGNUM
- in its virtual format, with the type specified by
- REGISTER_VIRTUAL_TYPE. */
-value
-value_of_register (regnum)
- int regnum;
-{
- CORE_ADDR addr;
- int optim;
- register value val;
- char raw_buffer[MAX_REGISTER_RAW_SIZE];
- char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
- enum lval_type lval;
+/* This routine is getting awfully cluttered with #if's. It's probably
+ time to turn this into READ_PC and define it in the tm.h file.
+ Ditto for write_pc.
- get_saved_register (raw_buffer, &optim, &addr,
- selected_frame, regnum, &lval);
+ 1999-06-08: The following were re-written so that it assumes the
+ existance of a TARGET_READ_PC et.al. macro. A default generic
+ version of that macro is made available where needed.
+
+ Since the ``TARGET_READ_PC'' et.al. macro is going to be controlled
+ by the multi-arch framework, it will eventually be possible to
+ eliminate the intermediate read_pc_pid(). The client would call
+ TARGET_READ_PC directly. (cagney). */
+
+#ifndef TARGET_READ_PC
+#define TARGET_READ_PC generic_target_read_pc
+#endif
- target_convert_to_virtual (regnum, raw_buffer, virtual_buffer);
- val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
- bcopy (virtual_buffer, VALUE_CONTENTS_RAW (val),
- REGISTER_VIRTUAL_SIZE (regnum));
- VALUE_LVAL (val) = lval;
- VALUE_ADDRESS (val) = addr;
- VALUE_REGNO (val) = regnum;
- VALUE_OPTIMIZED_OUT (val) = optim;
- return val;
+CORE_ADDR
+generic_target_read_pc (pid)
+{
+#ifdef PC_REGNUM
+ if (PC_REGNUM >= 0)
+ {
+ CORE_ADDR pc_val = ADDR_BITS_REMOVE ((CORE_ADDR) read_register_pid (PC_REGNUM, pid));
+ return pc_val;
+ }
+#endif
+ internal_error ("generic_target_read_pc");
+ return 0;
}
-\f
-/* Low level examining and depositing of registers.
- The caller is responsible for making
- sure that the inferior is stopped before calling the fetching routines,
- or it will get garbage. (a change from GDB version 3, in which
- the caller got the value from the last stop). */
+CORE_ADDR
+read_pc_pid (pid)
+ int pid;
+{
+ int saved_inferior_pid;
+ CORE_ADDR pc_val;
-/* Contents of the registers in target byte order.
- We allocate some extra slop since we do a lot of bcopy's around `registers',
- and failing-soft is better than failing hard. */
-char registers[REGISTER_BYTES + /* SLOP */ 256];
+ /* In case pid != inferior_pid. */
+ saved_inferior_pid = inferior_pid;
+ inferior_pid = pid;
-/* Nonzero if that register has been fetched. */
-char register_valid[NUM_REGS];
+ pc_val = TARGET_READ_PC (pid);
-/* Indicate that registers may have changed, so invalidate the cache. */
-void
-registers_changed ()
-{
- int i;
- for (i = 0; i < NUM_REGS; i++)
- register_valid[i] = 0;
+ inferior_pid = saved_inferior_pid;
+ return pc_val;
}
-/* Indicate that all registers have been fetched, so mark them all valid. */
-void
-registers_fetched ()
+CORE_ADDR
+read_pc ()
{
- int i;
- for (i = 0; i < NUM_REGS; i++)
- register_valid[i] = 1;
+ return read_pc_pid (inferior_pid);
}
-/* Copy LEN bytes of consecutive data from registers
- starting with the REGBYTE'th byte of register data
- into memory at MYADDR. */
+#ifndef TARGET_WRITE_PC
+#define TARGET_WRITE_PC generic_target_write_pc
+#endif
void
-read_register_bytes (regbyte, myaddr, len)
- int regbyte;
- char *myaddr;
- int len;
+generic_target_write_pc (pc, pid)
+ CORE_ADDR pc;
+ int pid;
{
- /* Fetch all registers. */
- int i;
- for (i = 0; i < NUM_REGS; i++)
- if (!register_valid[i])
- {
- target_fetch_registers (-1);
- break;
- }
- if (myaddr != NULL)
- bcopy (®isters[regbyte], myaddr, len);
+#ifdef PC_REGNUM
+ if (PC_REGNUM >= 0)
+ write_register_pid (PC_REGNUM, pc, pid);
+#ifdef NPC_REGNUM
+ if (NPC_REGNUM >= 0)
+ write_register_pid (NPC_REGNUM, pc + 4, pid);
+#ifdef NNPC_REGNUM
+ if (NNPC_REGNUM >= 0)
+ write_register_pid (NNPC_REGNUM, pc + 8, pid);
+#endif
+#endif
+#else
+ internal_error ("generic_target_write_pc");
+#endif
}
-/* Read register REGNO into memory at MYADDR, which must be large enough
- for REGISTER_RAW_BYTES (REGNO). Target byte-order.
- If the register is known to be the size of a CORE_ADDR or smaller,
- read_register can be used instead. */
void
-read_register_gen (regno, myaddr)
- int regno;
- char *myaddr;
+write_pc_pid (pc, pid)
+ CORE_ADDR pc;
+ int pid;
{
- if (!register_valid[regno])
- target_fetch_registers (regno);
- bcopy (®isters[REGISTER_BYTE (regno)], myaddr, REGISTER_RAW_SIZE (regno));
-}
+ int saved_inferior_pid;
-/* Copy LEN bytes of consecutive data from memory at MYADDR
- into registers starting with the REGBYTE'th byte of register data. */
+ /* In case pid != inferior_pid. */
+ saved_inferior_pid = inferior_pid;
+ inferior_pid = pid;
+
+ TARGET_WRITE_PC (pc, pid);
+
+ inferior_pid = saved_inferior_pid;
+}
void
-write_register_bytes (regbyte, myaddr, len)
- int regbyte;
- char *myaddr;
- int len;
+write_pc (pc)
+ CORE_ADDR pc;
{
- /* Make sure the entire registers array is valid. */
- read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
- bcopy (myaddr, ®isters[regbyte], len);
- target_store_registers (-1);
+ write_pc_pid (pc, inferior_pid);
}
-/* Return the contents of register REGNO, regarding it as an integer. */
+/* Cope with strage ways of getting to the stack and frame pointers */
+
+#ifndef TARGET_READ_SP
+#define TARGET_READ_SP generic_target_read_sp
+#endif
CORE_ADDR
-read_register (regno)
- int regno;
+generic_target_read_sp ()
{
- int reg;
- if (!register_valid[regno])
- target_fetch_registers (regno);
- /* FIXME, this loses when REGISTER_RAW_SIZE (regno) != sizeof (int) */
- reg = *(int *) ®isters[REGISTER_BYTE (regno)];
- SWAP_TARGET_AND_HOST (®, sizeof (int));
- return reg;
+#ifdef SP_REGNUM
+ if (SP_REGNUM >= 0)
+ return read_register (SP_REGNUM);
+#endif
+ internal_error ("generic_target_read_sp");
}
-/* Registers we shouldn't try to store. */
-#if !defined (CANNOT_STORE_REGISTER)
-#define CANNOT_STORE_REGISTER(regno) 0
-#endif
+CORE_ADDR
+read_sp ()
+{
+ return TARGET_READ_SP ();
+}
-/* Store VALUE in the register number REGNO, regarded as an integer. */
+#ifndef TARGET_WRITE_SP
+#define TARGET_WRITE_SP generic_target_write_sp
+#endif
void
-write_register (regno, val)
- int regno, val;
+generic_target_write_sp (val)
+ CORE_ADDR val;
{
- /* On the sparc, writing %g0 is a no-op, so we don't even want to change
- the registers array if something writes to this register. */
- if (CANNOT_STORE_REGISTER (regno))
- return;
+#ifdef SP_REGNUM
+ if (SP_REGNUM >= 0)
+ {
+ write_register (SP_REGNUM, val);
+ return;
+ }
+#endif
+ internal_error ("generic_target_write_sp");
+}
- SWAP_TARGET_AND_HOST (&val, sizeof (int));
+void
+write_sp (val)
+ CORE_ADDR val;
+{
+ TARGET_WRITE_SP (val);
+}
- target_prepare_to_store ();
+#ifndef TARGET_READ_FP
+#define TARGET_READ_FP generic_target_read_fp
+#endif
- register_valid [regno] = 1;
- /* FIXME, this loses when REGISTER_RAW_SIZE (regno) != sizeof (int) */
- /* FIXME, this depends on REGISTER_BYTE (regno) being aligned for host */
- *(int *) ®isters[REGISTER_BYTE (regno)] = val;
+CORE_ADDR
+generic_target_read_fp ()
+{
+#ifdef FP_REGNUM
+ if (FP_REGNUM >= 0)
+ return read_register (FP_REGNUM);
+#endif
+ internal_error ("generic_target_read_fp");
+}
- target_store_registers (regno);
+CORE_ADDR
+read_fp ()
+{
+ return TARGET_READ_FP ();
}
-/* Record that register REGNO contains VAL.
- This is used when the value is obtained from the inferior or core dump,
- so there is no need to store the value there. */
+#ifndef TARGET_WRITE_FP
+#define TARGET_WRITE_FP generic_target_write_fp
+#endif
void
-supply_register (regno, val)
- int regno;
- char *val;
+generic_target_write_fp (val)
+ CORE_ADDR val;
{
- register_valid[regno] = 1;
- bcopy (val, ®isters[REGISTER_BYTE (regno)], REGISTER_RAW_SIZE (regno));
+#ifdef FP_REGNUM
+ if (FP_REGNUM >= 0)
+ {
+ write_register (FP_REGNUM, val);
+ return;
+ }
+#endif
+ internal_error ("generic_target_write_fp");
+}
+
+void
+write_fp (val)
+ CORE_ADDR val;
+{
+ TARGET_WRITE_FP (val);
}
\f
+/* Will calling read_var_value or locate_var_value on SYM end
+ up caring what frame it is being evaluated relative to? SYM must
+ be non-NULL. */
+int
+symbol_read_needs_frame (sym)
+ struct symbol *sym;
+{
+ switch (SYMBOL_CLASS (sym))
+ {
+ /* All cases listed explicitly so that gcc -Wall will detect it if
+ we failed to consider one. */
+ case LOC_REGISTER:
+ case LOC_ARG:
+ case LOC_REF_ARG:
+ case LOC_REGPARM:
+ case LOC_REGPARM_ADDR:
+ case LOC_LOCAL:
+ case LOC_LOCAL_ARG:
+ case LOC_BASEREG:
+ case LOC_BASEREG_ARG:
+ case LOC_THREAD_LOCAL_STATIC:
+ return 1;
+
+ case LOC_UNDEF:
+ case LOC_CONST:
+ case LOC_STATIC:
+ case LOC_INDIRECT:
+ case LOC_TYPEDEF:
+
+ case LOC_LABEL:
+ /* Getting the address of a label can be done independently of the block,
+ even if some *uses* of that address wouldn't work so well without
+ the right frame. */
+
+ case LOC_BLOCK:
+ case LOC_CONST_BYTES:
+ case LOC_UNRESOLVED:
+ case LOC_OPTIMIZED_OUT:
+ return 0;
+ }
+ return 1;
+}
+
/* Given a struct symbol for a variable,
and a stack frame id, read the value of the variable
and return a (pointer to a) struct value containing the value.
If the variable cannot be found, return a zero pointer.
If FRAME is NULL, use the selected_frame. */
-value
+value_ptr
read_var_value (var, frame)
register struct symbol *var;
- FRAME frame;
+ struct frame_info *frame;
{
- register value v;
- struct frame_info *fi;
+ register value_ptr v;
struct type *type = SYMBOL_TYPE (var);
CORE_ADDR addr;
register int len;
v = allocate_value (type);
VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */
+ VALUE_BFD_SECTION (v) = SYMBOL_BFD_SECTION (var);
+
len = TYPE_LENGTH (type);
- if (frame == 0) frame = selected_frame;
+ if (frame == NULL)
+ frame = selected_frame;
switch (SYMBOL_CLASS (var))
{
case LOC_CONST:
- bcopy (&SYMBOL_VALUE (var), VALUE_CONTENTS_RAW (v), len);
- SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (v), len);
+ /* Put the constant back in target format. */
+ store_signed_integer (VALUE_CONTENTS_RAW (v), len,
+ (LONGEST) SYMBOL_VALUE (var));
VALUE_LVAL (v) = not_lval;
return v;
case LOC_LABEL:
- addr = SYMBOL_VALUE_ADDRESS (var);
- bcopy (&addr, VALUE_CONTENTS_RAW (v), len);
- SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (v), len);
+ /* Put the constant back in target format. */
+ if (overlay_debugging)
+ store_address (VALUE_CONTENTS_RAW (v), len,
+ (LONGEST) symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
+ SYMBOL_BFD_SECTION (var)));
+ else
+ store_address (VALUE_CONTENTS_RAW (v), len,
+ (LONGEST) SYMBOL_VALUE_ADDRESS (var));
VALUE_LVAL (v) = not_lval;
return v;
case LOC_CONST_BYTES:
- addr = SYMBOL_VALUE_ADDRESS (var);
- bcopy (addr, VALUE_CONTENTS_RAW (v), len);
- VALUE_LVAL (v) = not_lval;
- return v;
+ {
+ char *bytes_addr;
+ bytes_addr = SYMBOL_VALUE_BYTES (var);
+ memcpy (VALUE_CONTENTS_RAW (v), bytes_addr, len);
+ VALUE_LVAL (v) = not_lval;
+ return v;
+ }
case LOC_STATIC:
- case LOC_EXTERNAL:
- addr = SYMBOL_VALUE_ADDRESS (var);
+ if (overlay_debugging)
+ addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
+ SYMBOL_BFD_SECTION (var));
+ else
+ addr = SYMBOL_VALUE_ADDRESS (var);
break;
-/* Nonzero if a struct which is located in a register or a LOC_ARG
- really contains
- the address of the struct, not the struct itself. GCC_P is nonzero
- if the function was compiled with GCC. */
-#if !defined (REG_STRUCT_HAS_ADDR)
-#define REG_STRUCT_HAS_ADDR(gcc_p) 0
-#endif
+ case LOC_INDIRECT:
+ /* The import slot does not have a real address in it from the
+ dynamic loader (dld.sl on HP-UX), if the target hasn't begun
+ execution yet, so check for that. */
+ if (!target_has_execution)
+ error ("\
+Attempt to access variable defined in different shared object or load module when\n\
+addresses have not been bound by the dynamic loader. Try again when executable is running.");
+
+ addr = SYMBOL_VALUE_ADDRESS (var);
+ addr = read_memory_unsigned_integer
+ (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT);
+ break;
case LOC_ARG:
- fi = get_frame_info (frame);
- if (fi == NULL)
+ if (frame == NULL)
return 0;
- addr = FRAME_ARGS_ADDRESS (fi);
- if (!addr) {
+ addr = FRAME_ARGS_ADDRESS (frame);
+ if (!addr)
return 0;
- }
addr += SYMBOL_VALUE (var);
break;
-
+
case LOC_REF_ARG:
- fi = get_frame_info (frame);
- if (fi == NULL)
+ if (frame == NULL)
return 0;
- addr = FRAME_ARGS_ADDRESS (fi);
- if (!addr) {
+ addr = FRAME_ARGS_ADDRESS (frame);
+ if (!addr)
return 0;
- }
addr += SYMBOL_VALUE (var);
- read_memory (addr, &addr, sizeof (CORE_ADDR));
+ addr = read_memory_unsigned_integer
+ (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT);
break;
-
+
case LOC_LOCAL:
case LOC_LOCAL_ARG:
- fi = get_frame_info (frame);
- if (fi == NULL)
+ if (frame == NULL)
return 0;
- addr = SYMBOL_VALUE (var) + FRAME_LOCALS_ADDRESS (fi);
+ addr = FRAME_LOCALS_ADDRESS (frame);
+ addr += SYMBOL_VALUE (var);
break;
+ case LOC_BASEREG:
+ case LOC_BASEREG_ARG:
+ {
+ char buf[MAX_REGISTER_RAW_SIZE];
+ get_saved_register (buf, NULL, NULL, frame, SYMBOL_BASEREG (var),
+ NULL);
+ addr = extract_address (buf, REGISTER_RAW_SIZE (SYMBOL_BASEREG (var)));
+ addr += SYMBOL_VALUE (var);
+ break;
+ }
+
+ case LOC_THREAD_LOCAL_STATIC:
+ {
+ char buf[MAX_REGISTER_RAW_SIZE];
+
+ get_saved_register (buf, NULL, NULL, frame, SYMBOL_BASEREG (var),
+ NULL);
+ addr = extract_address (buf, REGISTER_RAW_SIZE (SYMBOL_BASEREG (var)));
+ 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));
+ if (overlay_debugging)
+ VALUE_ADDRESS (v) = symbol_overlayed_address
+ (BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_BFD_SECTION (var));
+ else
+ VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
return v;
case LOC_REGISTER:
case LOC_REGPARM:
+ case LOC_REGPARM_ADDR:
{
struct block *b;
+ int regno = SYMBOL_VALUE (var);
+ value_ptr regval;
if (frame == NULL)
return 0;
b = get_frame_block (frame);
-
- v = value_from_register (type, SYMBOL_VALUE (var), frame);
- if (REG_STRUCT_HAS_ADDR (BLOCK_GCC_COMPILED (b))
- && TYPE_CODE (type) == TYPE_CODE_STRUCT)
- addr = *(CORE_ADDR *)VALUE_CONTENTS (v);
+ if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR)
+ {
+ regval = value_from_register (lookup_pointer_type (type),
+ regno,
+ frame);
+
+ if (regval == NULL)
+ error ("Value of register variable not available.");
+
+ addr = value_as_pointer (regval);
+ VALUE_LVAL (v) = lval_memory;
+ }
else
- return v;
+ {
+ regval = value_from_register (type, regno, frame);
+
+ if (regval == NULL)
+ error ("Value of register variable not available.");
+ return regval;
+ }
+ }
+ break;
+
+ case LOC_UNRESOLVED:
+ {
+ struct minimal_symbol *msym;
+
+ msym = lookup_minimal_symbol (SYMBOL_NAME (var), NULL, NULL);
+ if (msym == NULL)
+ return 0;
+ if (overlay_debugging)
+ addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym),
+ SYMBOL_BFD_SECTION (msym));
+ else
+ addr = SYMBOL_VALUE_ADDRESS (msym);
}
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;
}
/* Return a value of type TYPE, stored in register REGNUM, in frame
- FRAME. */
+ FRAME.
+
+ NOTE: returns NULL if register value is not available.
+ Caller will check return value or die! */
-value
+value_ptr
value_from_register (type, regnum, frame)
struct type *type;
int regnum;
- FRAME frame;
+ struct frame_info *frame;
{
- char raw_buffer [MAX_REGISTER_RAW_SIZE];
- char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
+ char raw_buffer[MAX_REGISTER_RAW_SIZE];
CORE_ADDR addr;
int optim;
- value v = allocate_value (type);
- int len = TYPE_LENGTH (type);
+ value_ptr v = allocate_value (type);
char *value_bytes = 0;
int value_bytes_copied = 0;
int num_storage_locs;
enum lval_type lval;
+ int len;
+
+ CHECK_TYPEDEF (type);
+ len = TYPE_LENGTH (type);
VALUE_REGNO (v) = regnum;
((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 :
1);
- if (num_storage_locs > 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;
+ CORE_ADDR first_addr = 0;
value_bytes = (char *) alloca (len + MAX_REGISTER_RAW_SIZE);
/* Copy all of the data out, whereever it may be. */
- for (local_regnum = regnum;
- value_bytes_copied < len;
- (value_bytes_copied += REGISTER_RAW_SIZE (local_regnum),
- ++local_regnum))
+#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)
{
- get_saved_register (value_bytes + value_bytes_copied,
+ 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 (register_valid[page_regnum] == -1)
+ return NULL; /* register value not available */
+
+ if (lval == lval_register)
+ reg_stor++;
+ else
+ mem_stor++;
+ first_addr = addr;
+ last_addr = addr;
+
+ get_saved_register (value_bytes + 2,
&optim,
&addr,
frame,
- local_regnum,
+ regnum,
&lval);
+
+ if (register_valid[regnum] == -1)
+ return NULL; /* register value not available */
+
if (lval == lval_register)
reg_stor++;
else
{
mem_stor++;
-
- if (regnum == local_regnum)
- first_addr = addr;
-
- mem_tracking =
- (mem_tracking
- && (regnum == local_regnum
- || addr == last_addr));
+ 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 (register_valid[local_regnum] == -1)
+ return NULL; /* register value not available */
+
+ 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))
VALUE_ADDRESS (v) = first_addr;
}
else
- fatal ("value_from_register: Value not stored anywhere!");
+ internal_error ("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. */
+ 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. */
- bcopy (value_bytes, VALUE_CONTENTS_RAW (v), len);
+ 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;
}
read the data in raw format. */
get_saved_register (raw_buffer, &optim, &addr, frame, regnum, &lval);
+
+ if (register_valid[regnum] == -1)
+ return NULL; /* register value not available */
+
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.) */
-
- target_convert_to_virtual (regnum, raw_buffer, virtual_buffer);
-
+
+ /* Convert raw data to virtual format if necessary. */
+
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));
- bcopy (virtual_buffer, VALUE_CONTENTS_RAW (v), len);
- v = value_cast (type, v);
- }
- else
- bcopy (virtual_buffer, VALUE_CONTENTS_RAW (v), len);
+ REGISTER_CONVERT_TO_VIRTUAL (regnum, type,
+ raw_buffer, VALUE_CONTENTS_RAW (v));
}
else
{
/* Raw and virtual formats are the same for this register. */
-#if TARGET_BYTE_ORDER == BIG_ENDIAN
- if (len < REGISTER_RAW_SIZE (regnum))
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN && len < REGISTER_RAW_SIZE (regnum))
{
- /* Big-endian, and we want less than full size. */
+ /* Big-endian, and we want less than full size. */
VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len;
}
-#endif
- bcopy (virtual_buffer + VALUE_OFFSET (v),
- VALUE_CONTENTS_RAW (v), len);
+ memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len);
}
-
+
return v;
}
\f
-/* Given a struct symbol for a variable,
+/* Given a struct symbol for a variable or function,
and a stack frame id,
- return a (pointer to a) struct value containing the variable's address. */
+ return a (pointer to a) struct value containing the properly typed
+ address. */
-value
+value_ptr
locate_var_value (var, frame)
register struct symbol *var;
- FRAME frame;
+ struct frame_info *frame;
{
CORE_ADDR addr = 0;
struct type *type = SYMBOL_TYPE (var);
- struct type *result_type;
- value lazy_value;
+ value_ptr 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_NAME (var));
+ error ("Address of \"%s\" is unknown.", SYMBOL_SOURCE_NAME (var));
- if (VALUE_LAZY (lazy_value))
+ if (VALUE_LAZY (lazy_value)
+ || TYPE_CODE (type) == TYPE_CODE_FUNC)
{
- addr = VALUE_ADDRESS (lazy_value);
-
- /* C++: The "address" of a reference should yield the address
- * of the object pointed to. So force an extra de-reference. */
-
- if (TYPE_CODE (type) == TYPE_CODE_REF)
- {
- char *buf = alloca (TYPE_LENGTH (type));
- read_memory (addr, buf, TYPE_LENGTH (type));
- addr = unpack_pointer (type, buf);
- type = TYPE_TARGET_TYPE (type);
- }
-
- /* Address of an array is of the type of address of it's elements. */
- result_type =
- lookup_pointer_type (TYPE_CODE (type) == TYPE_CODE_ARRAY ?
- TYPE_TARGET_TYPE (type) : type);
+ value_ptr val;
- return value_cast (result_type,
- value_from_long (builtin_type_long, (LONGEST) addr));
+ addr = VALUE_ADDRESS (lazy_value);
+ val = value_from_longest (lookup_pointer_type (type), (LONGEST) addr);
+ VALUE_BFD_SECTION (val) = VALUE_BFD_SECTION (lazy_value);
+ return val;
}
/* Not a memory address; check what the problem was. */
- switch (VALUE_LVAL (lazy_value))
+ 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_NAME (var));
+ SYMBOL_SOURCE_NAME (var));
break;
default:
error ("Can't take address of \"%s\" which isn't an lvalue.",
- SYMBOL_NAME (var));
+ SYMBOL_SOURCE_NAME (var));
break;
}
- return 0; /* For lint -- never reached */
+ return 0; /* For lint -- never reached */
+}
+\f
+
+static void build_findvar PARAMS ((void));
+static void
+build_findvar ()
+{
+ /* We allocate some extra slop since we do a lot of memcpy's around
+ `registers', and failing-soft is better than failing hard. */
+ int sizeof_registers = REGISTER_BYTES + /* SLOP */ 256;
+ int sizeof_register_valid = NUM_REGS * sizeof (*register_valid);
+ registers = xmalloc (sizeof_registers);
+ memset (registers, 0, sizeof_registers);
+ register_valid = xmalloc (sizeof_register_valid);
+ memset (register_valid, 0, sizeof_register_valid);
+}
+
+void _initialize_findvar PARAMS ((void));
+void
+_initialize_findvar ()
+{
+ build_findvar ();
+
+ register_gdbarch_swap (®isters, sizeof (registers), NULL);
+ register_gdbarch_swap (®ister_valid, sizeof (register_valid), NULL);
+ register_gdbarch_swap (NULL, 0, build_findvar);
}
projects / deliverable / binutils-gdb.git / blobdiff