/* Find a variable's value in memory, for GDB, the GNU debugger.
- Copyright 1986, 1987, 1989, 1991, 1994, 1995 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.
-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.
+ 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.
-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.
+ 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 this program; if not, write to the Free Software
-Foundation, Inc., 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 "defs.h"
#include "symtab.h"
#include "inferior.h"
#include "target.h"
#include "gdb_string.h"
+#include "floatformat.h"
+#include "symfile.h" /* for overlay functions */
+
+/* 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_pid PARAMS ((int regno, LONGEST val, int pid));
+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. */
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
+you lose
#endif
-LONGEST
+ LONGEST
extract_signed_integer (addr, len)
PTR addr;
int len;
{
LONGEST retval;
unsigned char *p;
- unsigned char *startaddr = (unsigned char *)addr;
+ unsigned char *startaddr = (unsigned char *) addr;
unsigned char *endaddr = startaddr + len;
- if (len > sizeof (LONGEST))
+ if (len > (int) sizeof (LONGEST))
error ("\
That operation is not available on integers of more than %d bytes.",
sizeof (LONGEST));
{
p = startaddr;
/* Do the sign extension once at the start. */
- retval = ((LONGEST)*p ^ 0x80) - 0x80;
+ retval = ((LONGEST) * p ^ 0x80) - 0x80;
for (++p; p < endaddr; ++p)
retval = (retval << 8) | *p;
}
{
p = endaddr - 1;
/* Do the sign extension once at the start. */
- retval = ((LONGEST)*p ^ 0x80) - 0x80;
+ retval = ((LONGEST) * p ^ 0x80) - 0x80;
for (--p; p >= startaddr; --p)
retval = (retval << 8) | *p;
}
return retval;
}
-unsigned LONGEST
+ULONGEST
extract_unsigned_integer (addr, len)
PTR addr;
int len;
{
- unsigned LONGEST retval;
+ ULONGEST retval;
unsigned char *p;
- unsigned char *startaddr = (unsigned char *)addr;
+ unsigned char *startaddr = (unsigned char *) addr;
unsigned char *endaddr = startaddr + len;
- if (len > sizeof (unsigned LONGEST))
+ if (len > (int) sizeof (ULONGEST))
error ("\
That operation is not available on integers of more than %d bytes.",
- sizeof (unsigned LONGEST));
+ sizeof (ULONGEST));
/* Start at the most significant end of the integer, and work towards
the least significant. */
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;
{
/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
whether we want this to be true eventually. */
- return extract_unsigned_integer (addr, len);
+ return (CORE_ADDR) extract_unsigned_integer (addr, len);
}
void
LONGEST val;
{
unsigned char *p;
- unsigned char *startaddr = (unsigned char *)addr;
+ unsigned char *startaddr = (unsigned char *) addr;
unsigned char *endaddr = startaddr + len;
/* Start at the least significant end of the integer, and work towards
store_unsigned_integer (addr, len, val)
PTR addr;
int len;
- unsigned LONGEST val;
+ ULONGEST val;
{
unsigned char *p;
- unsigned char *startaddr = (unsigned char *)addr;
+ unsigned char *startaddr = (unsigned char *) addr;
unsigned char *endaddr = startaddr + len;
/* Start at the least significant end of the integer, and work towards
}
}
+/* 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;
- CORE_ADDR val;
+ LONGEST val;
{
- /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
- whether we want this to be true eventually. */
- store_unsigned_integer (addr, len, (LONGEST)val);
+ store_unsigned_integer (addr, len, val);
}
\f
-/* Swap LEN bytes at BUFFER between target and host byte-order. */
-#define SWAP_FLOATING(buffer,len) \
- do \
- { \
- if (TARGET_BYTE_ORDER != HOST_BYTE_ORDER) \
- { \
- char tmp; \
- char *p = (char *)(buffer); \
- char *q = ((char *)(buffer)) + len - 1; \
- for (; p < q; p++, q--) \
- { \
- tmp = *q; \
- *q = *p; \
- *p = tmp; \
- } \
- } \
- } \
- while (0)
-
-/* There are various problems with the extract_floating and store_floating
- routines.
-
- 1. These routines only handle byte-swapping, not conversion of
- formats. So if host is IEEE floating and target is VAX floating,
- or vice-versa, it loses. This means that we can't (yet) use these
- routines for extendeds. Extendeds are handled by
- REGISTER_CONVERTIBLE. What we want is to use floatformat.h, but that
- doesn't yet handle VAX floating at all.
-
- 2. We can't deal with it if there is more than one floating point
- format in use. This has to be fixed at the unpack_double level.
-
- 3. We probably should have a LONGEST_DOUBLE or DOUBLEST or whatever
- we want to call it which is long double where available. */
-
-double
+/* 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))
{
- float retval;
- memcpy (&retval, addr, sizeof (retval));
- SWAP_FLOATING (&retval, sizeof (retval));
- return retval;
+ 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))
{
- double retval;
- memcpy (&retval, addr, sizeof (retval));
- SWAP_FLOATING (&retval, sizeof (retval));
- return retval;
+ 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;
- double val;
+ DOUBLEST val;
{
if (len == sizeof (float))
{
- float floatval = val;
- SWAP_FLOATING (&floatval, sizeof (floatval));
- memcpy (addr, &floatval, sizeof (floatval));
+ 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))
{
- SWAP_FLOATING (&val, sizeof (val));
- memcpy (addr, &val, sizeof (val));
+ 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
-#if !defined (GET_SAVED_REGISTER)
/* 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.
struct frame_info *frame;
int regnum;
{
- struct frame_saved_regs saved_regs;
-
register struct frame_info *frame1 = NULL;
register CORE_ADDR addr = 0;
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;
-
- get_frame_saved_regs (frame1, &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;
- get_frame_saved_regs (frame1, &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;
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;
if (raw_buffer != NULL)
{
/* Put it back in target format. */
- store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), addr);
+ store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), (LONGEST) addr);
}
if (addrp != NULL)
*addrp = 0;
if (addrp != NULL)
*addrp = addr;
}
-#endif /* GET_SAVED_REGISTER. */
-/* Copy the bytes of register REGNUM, relative to the current stack frame,
+#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. */
-int
-read_relative_register_raw_bytes (regnum, myaddr)
+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 && selected_frame)
+ if (regnum == FP_REGNUM && frame)
{
- /* Put it back in target format. */
- store_address (myaddr, REGISTER_RAW_SIZE(FP_REGNUM),
- FRAME_FP(selected_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, selected_frame,
- regnum, (enum lval_type *)NULL);
+ 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. */
+ 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)
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. */
-#ifdef REGISTER_CONVERTIBLE
if (REGISTER_CONVERTIBLE (regnum))
{
REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum),
raw_buffer, VALUE_CONTENTS_RAW (reg_val));
}
- else
-#endif
+ 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;
or it will get garbage. (a change from GDB version 3, in which
the caller got the value from the last stop). */
-/* Contents of the registers in target byte order.
- We allocate some extra slop since we do a lot of memcpy's around `registers',
- and failing-soft is better than failing hard. */
-char registers[REGISTER_BYTES + /* SLOP */ 256];
+/* Contents and state of the registers (in target byte order). */
-/* Nonzero if that register has been fetched. */
-char register_valid[NUM_REGS];
+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'. */
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;
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 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. It would also
- be good to have a write_register_gen for similar reasons.
-
- 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. */
+/* 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
for (regno = 0; regno < NUM_REGS; regno++)
{
int regstart, regend;
- int startin, endin;
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);
- startin = regstart >= inregbyte && regstart < inregend;
- endin = regend > inregbyte && regend <= inregend;
-
- if (!startin && !endin)
+ 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. */
-
+ Update it from the target. */
target_fetch_registers (regno);
if (!register_valid[regno])
/* Write register REGNO at MYADDR to the target. MYADDR points at
REGISTER_RAW_BYTES(REGNO), which must be in target byte-order. */
-void
+static void
write_register_gen (regno, myaddr)
int regno;
char *myaddr;
registers_pid = inferior_pid;
}
- size = REGISTER_RAW_SIZE(regno);
+ 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]
+ 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;
+ register_valid[regno] = 1;
target_store_registers (regno);
}
for (regno = 0; regno < NUM_REGS; regno++)
{
int regstart, regend;
- int startin, endin;
- char regbuf[MAX_REGISTER_RAW_SIZE];
regstart = REGISTER_BYTE (regno);
regend = regstart + REGISTER_RAW_SIZE (regno);
- startin = regstart >= myregstart && regstart < myregend;
- endin = regend > myregstart && regend <= myregend;
+ /* Is this register completely outside the range the user is writing? */
+ if (myregend <= regstart || regend <= myregstart)
+ /* do nothing */ ;
- if (!startin && !endin)
- continue; /* Register is completely out of range */
+ /* Is this register completely within the range the user is writing? */
+ else if (myregstart <= regstart && regend <= myregend)
+ write_register_gen (regno, myaddr + (regstart - myregstart));
- if (startin && endin) /* register is completely in range */
+ /* The register partially overlaps the range being written. */
+ else
{
- write_register_gen (regno, myaddr + (regstart - myregstart));
- continue;
- }
+ 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);
- /* 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);
-
- if (startin)
- memcpy (registers + regstart,
- myaddr + regstart - myregstart,
- myregend - regstart);
- else /* endin */
- memcpy (registers + myregstart,
- myaddr,
- regend - myregstart);
- target_store_registers (regno);
+ 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. */
if (!register_valid[regno])
target_fetch_registers (regno);
- return extract_address (®isters[REGISTER_BYTE (regno)],
- REGISTER_RAW_SIZE(regno));
+ return (CORE_ADDR) extract_address (®isters[REGISTER_BYTE (regno)],
+ REGISTER_RAW_SIZE (regno));
}
CORE_ADDR
return retval;
}
-/* Store VALUE, into the raw contents of register number REGNO. */
+/* 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)
registers_pid = inferior_pid;
}
- size = REGISTER_RAW_SIZE(regno);
+ 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]
+ 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;
+ register_valid[regno] = 1;
target_store_registers (regno);
}
-static void
+void
write_register_pid (regno, val, pid)
int regno;
- LONGEST val;
+ CORE_ADDR val;
int pid;
{
int 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. */
+ so there is no need to store the value there.
+
+ 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.
+ */
void
supply_register (regno, val)
int regno;
char *val;
{
+#if 1
if (registers_pid != inferior_pid)
{
registers_changed ();
registers_pid = inferior_pid;
}
+#endif
register_valid[regno] = 1;
- memcpy (®isters[REGISTER_BYTE (regno)], val, REGISTER_RAW_SIZE (regno));
+ 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)]);
+ CLEAN_UP_REGISTER_VALUE (regno, ®isters[REGISTER_BYTE (regno)]);
#endif
}
/* 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. */
+ Ditto for write_pc.
+
+ 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
CORE_ADDR
-read_pc ()
+generic_target_read_pc (pid)
{
-#ifdef TARGET_READ_PC
- return TARGET_READ_PC (inferior_pid);
-#else
- return ADDR_BITS_REMOVE ((CORE_ADDR) read_register_pid (PC_REGNUM, inferior_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;
}
CORE_ADDR
read_pc_pid (pid)
int pid;
{
-#ifdef TARGET_READ_PC
- return TARGET_READ_PC (pid);
-#else
- return ADDR_BITS_REMOVE ((CORE_ADDR) read_register_pid (PC_REGNUM, pid));
-#endif
+ int saved_inferior_pid;
+ CORE_ADDR pc_val;
+
+ /* In case pid != inferior_pid. */
+ saved_inferior_pid = inferior_pid;
+ inferior_pid = pid;
+
+ pc_val = TARGET_READ_PC (pid);
+
+ inferior_pid = saved_inferior_pid;
+ return pc_val;
+}
+
+CORE_ADDR
+read_pc ()
+{
+ return read_pc_pid (inferior_pid);
}
+#ifndef TARGET_WRITE_PC
+#define TARGET_WRITE_PC generic_target_write_pc
+#endif
+
void
-write_pc (val)
- CORE_ADDR val;
+generic_target_write_pc (pc, pid)
+ CORE_ADDR pc;
+ int pid;
{
-#ifdef TARGET_WRITE_PC
- TARGET_WRITE_PC (val, inferior_pid);
-#else
- write_register_pid (PC_REGNUM, val, inferior_pid);
+#ifdef PC_REGNUM
+ if (PC_REGNUM >= 0)
+ write_register_pid (PC_REGNUM, pc, pid);
#ifdef NPC_REGNUM
- write_register_pid (NPC_REGNUM, val + 4, inferior_pid);
+ if (NPC_REGNUM >= 0)
+ write_register_pid (NPC_REGNUM, pc + 4, pid);
#ifdef NNPC_REGNUM
- write_register_pid (NNPC_REGNUM, val + 8, inferior_pid);
+ if (NNPC_REGNUM >= 0)
+ write_register_pid (NNPC_REGNUM, pc + 8, pid);
#endif
#endif
+#else
+ internal_error ("generic_target_write_pc");
#endif
}
void
-write_pc_pid (val, pid)
- CORE_ADDR val;
+write_pc_pid (pc, pid)
+ CORE_ADDR pc;
int pid;
{
-#ifdef TARGET_WRITE_PC
- TARGET_WRITE_PC (val, pid);
-#else
- write_register_pid (PC_REGNUM, val, pid);
-#ifdef NPC_REGNUM
- write_register_pid (NPC_REGNUM, val + 4, pid);
-#ifdef NNPC_REGNUM
- write_register_pid (NNPC_REGNUM, val + 8, pid);
-#endif
-#endif
-#endif
+ int saved_inferior_pid;
+
+ /* 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_pc (pc)
+ CORE_ADDR pc;
+{
+ write_pc_pid (pc, inferior_pid);
}
/* 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
+generic_target_read_sp ()
+{
+#ifdef SP_REGNUM
+ if (SP_REGNUM >= 0)
+ return read_register (SP_REGNUM);
+#endif
+ internal_error ("generic_target_read_sp");
+}
+
CORE_ADDR
read_sp ()
{
-#ifdef TARGET_READ_SP
return TARGET_READ_SP ();
-#else
- return read_register (SP_REGNUM);
+}
+
+#ifndef TARGET_WRITE_SP
+#define TARGET_WRITE_SP generic_target_write_sp
#endif
+
+void
+generic_target_write_sp (val)
+ CORE_ADDR val;
+{
+#ifdef SP_REGNUM
+ if (SP_REGNUM >= 0)
+ {
+ write_register (SP_REGNUM, val);
+ return;
+ }
+#endif
+ internal_error ("generic_target_write_sp");
}
void
write_sp (val)
CORE_ADDR val;
{
-#ifdef TARGET_WRITE_SP
TARGET_WRITE_SP (val);
-#else
- write_register (SP_REGNUM, val);
+}
+
+#ifndef TARGET_READ_FP
+#define TARGET_READ_FP generic_target_read_fp
#endif
+
+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");
}
CORE_ADDR
read_fp ()
{
-#ifdef TARGET_READ_FP
return TARGET_READ_FP ();
-#else
- return read_register (FP_REGNUM);
+}
+
+#ifndef TARGET_WRITE_FP
+#define TARGET_WRITE_FP generic_target_write_fp
#endif
+
+void
+generic_target_write_fp (val)
+ CORE_ADDR val;
+{
+#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;
{
-#ifdef TARGET_WRITE_FP
TARGET_WRITE_FP (val);
-#else
- write_register (FP_REGNUM, val);
-#endif
}
\f
/* Will calling read_var_value or locate_var_value on SYM end
switch (SYMBOL_CLASS (sym))
{
/* All cases listed explicitly so that gcc -Wall will detect it if
- we failed to consider one. */
+ we failed to consider one. */
case LOC_REGISTER:
case LOC_ARG:
case LOC_REF_ARG:
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. */
+ 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;
}
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 == NULL) frame = selected_frame;
+ if (frame == NULL)
+ frame = selected_frame;
switch (SYMBOL_CLASS (var))
{
case LOC_LABEL:
/* Put the constant back in target format. */
- store_address (VALUE_CONTENTS_RAW (v), len, SYMBOL_VALUE_ADDRESS (var));
+ 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_STATIC:
+ if (overlay_debugging)
+ addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
+ SYMBOL_BFD_SECTION (var));
+ else
+ addr = SYMBOL_VALUE_ADDRESS (var);
+ break;
+
+ 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:
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_ADDR:
{
struct block *b;
+ int regno = SYMBOL_VALUE (var);
+ value_ptr regval;
if (frame == NULL)
return 0;
b = get_frame_block (frame);
-
if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR)
{
- addr =
- value_as_pointer (value_from_register (lookup_pointer_type (type),
- SYMBOL_VALUE (var),
- frame));
+ 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 value_from_register (type, SYMBOL_VALUE (var), frame);
+ {
+ 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;
}
/* 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_ptr
value_from_register (type, regnum, frame)
int regnum;
struct frame_info *frame;
{
- char raw_buffer [MAX_REGISTER_RAW_SIZE];
+ char raw_buffer[MAX_REGISTER_RAW_SIZE];
CORE_ADDR addr;
int optim;
value_ptr 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;
+ int len;
+
+ CHECK_TYPEDEF (type);
+ len = TYPE_LENGTH (type);
VALUE_REGNO (v) = regnum;
#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;
switch (regnum)
{
- case R0_REGNUM: case R1_REGNUM: case R2_REGNUM: case R3_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:
+ case R4_REGNUM:
+ case R5_REGNUM:
page_regnum = SEG_E_REGNUM;
break;
- case R6_REGNUM: case R7_REGNUM:
+ case R6_REGNUM:
+ case R7_REGNUM:
page_regnum = SEG_T_REGNUM;
break;
}
page_regnum,
&lval);
+ if (register_valid[page_regnum] == -1)
+ return NULL; /* register value not available */
+
if (lval == lval_register)
reg_stor++;
else
regnum,
&lval);
+ if (register_valid[regnum] == -1)
+ return NULL; /* register value not available */
+
if (lval == lval_register)
reg_stor++;
else
last_addr = addr;
}
else
-#endif /* GDB_TARGET_IS_H8500 */
+#endif /* GDB_TARGET_IS_H8500 */
for (local_regnum = regnum;
value_bytes_copied < len;
(value_bytes_copied += REGISTER_RAW_SIZE (local_regnum),
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)
else
{
mem_stor++;
-
+
mem_tracking =
(mem_tracking
&& (regnum == local_regnum
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. */
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));
+ 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 raw data to virtual format if necessary. */
-
-#ifdef REGISTER_CONVERTIBLE
+
if (REGISTER_CONVERTIBLE (regnum))
{
REGISTER_CONVERT_TO_VIRTUAL (regnum, type,
raw_buffer, VALUE_CONTENTS_RAW (v));
}
else
-#endif
{
/* Raw and virtual formats are the same for this register. */
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;
}
memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len);
}
-
+
return v;
}
\f
if (VALUE_LAZY (lazy_value)
|| TYPE_CODE (type) == TYPE_CODE_FUNC)
{
+ value_ptr val;
+
addr = VALUE_ADDRESS (lazy_value);
- return value_from_longest (lookup_pointer_type (type), (LONGEST) addr);
+ 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:
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 / thirdparty / binutils-gdb.git / blobdiff