/* Find a variable's value in memory, for GDB, the GNU debugger.
- Copyright (C) 1986, 1987 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1989, 1991, 1994, 1995 Free Software Foundation, Inc.
-GDB is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY. No author or distributor accepts responsibility to anyone
-for the consequences of using it or for whether it serves any
-particular purpose or works at all, unless he says so in writing.
-Refer to the GDB General Public License for full details.
+This file is part of GDB.
-Everyone is granted permission to copy, modify and redistribute GDB,
-but only under the conditions described in the GDB General Public
-License. A copy of this license is supposed to have been given to you
-along with GDB so you can know your rights and responsibilities. It
-should be in a file named COPYING. Among other things, the copyright
-notice and this notice must be preserved on all copies.
+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.
-In other words, go ahead and share GDB, but don't try to stop
-anyone else from sharing it farther. Help stamp out software hoarding!
-*/
+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. */
#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 <string.h>
+
+static void write_register_pid PARAMS ((int regno, LONGEST val, int pid));
+
+/* 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 > 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;
+}
+
+unsigned LONGEST
+extract_unsigned_integer (addr, len)
+ PTR addr;
+ int len;
+{
+ unsigned LONGEST retval;
+ unsigned char *p;
+ unsigned char *startaddr = (unsigned char *)addr;
+ unsigned char *endaddr = startaddr + len;
+
+ if (len > sizeof (unsigned LONGEST))
+ error ("\
+That operation is not available on integers of more than %d bytes.",
+ sizeof (unsigned LONGEST));
+
+ /* 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;
+}
+
+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 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;
+ unsigned LONGEST val;
+{
+ unsigned char *p;
+ unsigned char *startaddr = (unsigned char *)addr;
+ unsigned char *endaddr = startaddr + len;
-CORE_ADDR read_register ();
+ /* 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_address (addr, len, val)
+ PTR addr;
+ int len;
+ CORE_ADDR 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);
+}
+\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_floating (addr, len)
+ PTR addr;
+ int len;
+{
+ if (len == sizeof (float))
+ {
+ float retval;
+ memcpy (&retval, addr, sizeof (retval));
+ SWAP_FLOATING (&retval, sizeof (retval));
+ return retval;
+ }
+ else if (len == sizeof (double))
+ {
+ double retval;
+ memcpy (&retval, addr, sizeof (retval));
+ SWAP_FLOATING (&retval, sizeof (retval));
+ return retval;
+ }
+ else
+ {
+ error ("Can't deal with a floating point number of %d bytes.", len);
+ }
+}
+
+void
+store_floating (addr, len, val)
+ PTR addr;
+ int len;
+ double val;
+{
+ if (len == sizeof (float))
+ {
+ float floatval = val;
+ SWAP_FLOATING (&floatval, sizeof (floatval));
+ memcpy (addr, &floatval, sizeof (floatval));
+ }
+ else if (len == sizeof (double))
+ {
+ SWAP_FLOATING (&val, sizeof (val));
+ memcpy (addr, &val, sizeof (val));
+ }
+ 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.
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 == NULL) /* No regs saved if want current frame */
+ return 0;
+
#ifdef HAVE_REGISTER_WINDOWS
/* We assume that a register in a register window will only be saved
- in one place (since the name changes and dissapears as you go
+ in one place (since the name changes and/or disappears as you go
towards inner frames), so we only call get_frame_saved_regs on
the current frame. This is directly in contradiction to the
usage below, which assumes that registers used in a frame must be
always returns the registers saved within a frame, within the
context (register namespace) of that frame. */
+ /* However, note that we don't want this to return anything if
+ nothing is saved (if there's a frame inside of this one). Also,
+ 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))
{
- fi = get_frame_info (frame);
- get_frame_saved_regs (fi, &saved_regs);
- return (saved_regs.regs[regnum] ?
- saved_regs.regs[regnum] : 0);
+ frame1 = get_next_frame (frame);
+ if (!frame1) return 0; /* Registers of this frame are active. */
+
+ /* Get the SP from the next frame in; it will be this
+ current frame. */
+ if (regnum != SP_REGNUM)
+ frame1 = frame;
+
+ get_frame_saved_regs (frame1, &saved_regs);
+ return saved_regs.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);
+ get_frame_saved_regs (frame1, &saved_regs);
if (saved_regs.regs[regnum])
addr = saved_regs.regs[regnum];
}
return addr;
}
-/* Copy the bytes of register REGNUM, relative to the current stack frame,
- into our memory at MYADDR.
- The number of bytes copied is REGISTER_RAW_SIZE (REGNUM). */
+/* 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.
+
+ Note that this implementation never sets *LVAL to not_lval. But
+ it can be replaced by defining GET_SAVED_REGISTER and supplying
+ your own.
+
+ The argument RAW_BUFFER must point to aligned memory. */
void
-read_relative_register_raw_bytes (regnum, myaddr)
+get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
+ char *raw_buffer;
+ int *optimized;
+ CORE_ADDR *addrp;
+ struct frame_info *frame;
int regnum;
- char *myaddr;
+ enum lval_type *lval;
{
- register CORE_ADDR addr;
-
- if (regnum == FP_REGNUM)
- {
- bcopy (&FRAME_FP(selected_frame), myaddr, sizeof (CORE_ADDR));
- return;
- }
+ CORE_ADDR addr;
- addr = find_saved_register (selected_frame, regnum);
+ if (!target_has_registers)
+ error ("No registers.");
- if (addr)
+ /* Normal systems don't optimize out things with register numbers. */
+ if (optimized != NULL)
+ *optimized = 0;
+ addr = find_saved_register (frame, regnum);
+ if (addr != 0)
{
+ if (lval != NULL)
+ *lval = lval_memory;
if (regnum == SP_REGNUM)
{
- CORE_ADDR buffer = addr;
- bcopy (&buffer, myaddr, sizeof (CORE_ADDR));
+ if (raw_buffer != NULL)
+ {
+ /* Put it back in target format. */
+ store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), addr);
+ }
+ if (addrp != NULL)
+ *addrp = 0;
+ return;
}
- else
- read_memory (addr, myaddr, REGISTER_RAW_SIZE (regnum));
- return;
+ if (raw_buffer != NULL)
+ read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
+ }
+ else
+ {
+ if (lval != NULL)
+ *lval = lval_register;
+ addr = REGISTER_BYTE (regnum);
+ if (raw_buffer != NULL)
+ read_register_gen (regnum, raw_buffer);
+ }
+ 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).
+
+ Returns 1 if could not be read, 0 if could. */
+
+int
+read_relative_register_raw_bytes (regnum, myaddr)
+ int regnum;
+ char *myaddr;
+{
+ int optim;
+ if (regnum == FP_REGNUM && selected_frame)
+ {
+ /* Put it back in target format. */
+ store_address (myaddr, REGISTER_RAW_SIZE(FP_REGNUM),
+ FRAME_FP(selected_frame));
+ return 0;
}
- read_register_bytes (REGISTER_BYTE (regnum),
- myaddr, REGISTER_RAW_SIZE (regnum));
+
+ get_saved_register (myaddr, &optim, (CORE_ADDR *) NULL, selected_frame,
+ regnum, (enum lval_type *)NULL);
+ return optim;
}
/* Return a `value' with the contents of register REGNUM
in its virtual format, with the type specified by
REGISTER_VIRTUAL_TYPE. */
-value
+value_ptr
value_of_register (regnum)
int regnum;
{
- register CORE_ADDR addr;
- register value val;
+ CORE_ADDR addr;
+ int optim;
+ register value_ptr reg_val;
char raw_buffer[MAX_REGISTER_RAW_SIZE];
- char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
+ enum lval_type lval;
- if (! (have_inferior_p () || have_core_file_p ()))
- error ("Can't get value of register without inferior or core file");
-
- addr = find_saved_register (selected_frame, regnum);
- if (addr)
+ get_saved_register (raw_buffer, &optim, &addr,
+ selected_frame, regnum, &lval);
+
+ reg_val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
+
+ /* Convert raw data to virtual format if necessary. */
+
+#ifdef REGISTER_CONVERTIBLE
+ if (REGISTER_CONVERTIBLE (regnum))
{
- if (regnum == SP_REGNUM)
- return value_from_long (builtin_type_int, (LONGEST) addr);
- read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
+ REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum),
+ raw_buffer, VALUE_CONTENTS_RAW (reg_val));
}
else
- read_register_bytes (REGISTER_BYTE (regnum), raw_buffer,
- REGISTER_RAW_SIZE (regnum));
-
- REGISTER_CONVERT_TO_VIRTUAL (regnum, raw_buffer, virtual_buffer);
- val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
- bcopy (virtual_buffer, VALUE_CONTENTS (val), REGISTER_VIRTUAL_SIZE (regnum));
- VALUE_LVAL (val) = addr ? lval_memory : lval_register;
- VALUE_ADDRESS (val) = addr ? addr : REGISTER_BYTE (regnum);
- VALUE_REGNO (val) = regnum;
- return val;
+#endif
+ memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer,
+ REGISTER_RAW_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.
- Note that you must call `fetch_registers' once
- before examining or depositing any 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 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];
+
+/* Nonzero if that register has been fetched. */
+char register_valid[NUM_REGS];
+
+/* The thread/process associated with the current set of registers. For now,
+ -1 is special, and means `no current process'. */
+int registers_pid = -1;
-char registers[REGISTER_BYTES];
+/* Indicate that registers may have changed, so invalidate the cache. */
+
+void
+registers_changed ()
+{
+ int i;
+ int numregs = ARCH_NUM_REGS;
+
+ registers_pid = -1;
+
+ for (i = 0; i < numregs; i++)
+ register_valid[i] = 0;
+}
+
+/* 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;
+}
/* Copy LEN bytes of consecutive data from registers
starting with the REGBYTE'th byte of register data
char *myaddr;
int len;
{
- bcopy (®isters[regbyte], myaddr, len);
+ /* Fetch all registers. */
+ int i, numregs;
+
+ if (registers_pid != inferior_pid)
+ {
+ registers_changed ();
+ registers_pid = inferior_pid;
+ }
+
+ numregs = ARCH_NUM_REGS;
+ for (i = 0; i < numregs; i++)
+ if (!register_valid[i])
+ {
+ target_fetch_registers (-1);
+ break;
+ }
+ if (myaddr != NULL)
+ memcpy (myaddr, ®isters[regbyte], len);
+}
+
+/* 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));
}
/* Copy LEN bytes of consecutive data from memory at MYADDR
char *myaddr;
int len;
{
- bcopy (myaddr, ®isters[regbyte], len);
- if (have_inferior_p ())
- store_inferior_registers (-1);
+ if (registers_pid != inferior_pid)
+ {
+ registers_changed ();
+ registers_pid = inferior_pid;
+ }
+
+ /* Make sure the entire registers array is valid. */
+ read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
+ memcpy (®isters[regbyte], myaddr, len);
+ target_store_registers (-1);
}
-/* Return the contents of register REGNO,
- regarding it as an integer. */
+/* 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;
{
- /* This loses when REGISTER_RAW_SIZE (regno) != sizeof (int) */
- return *(int *) ®isters[REGISTER_BYTE (regno)];
+ if (registers_pid != inferior_pid)
+ {
+ registers_changed ();
+ registers_pid = inferior_pid;
+ }
+
+ if (!register_valid[regno])
+ target_fetch_registers (regno);
+
+ return extract_address (®isters[REGISTER_BYTE (regno)],
+ REGISTER_RAW_SIZE(regno));
}
-/* Store VALUE in the register number REGNO, regarded as an integer. */
+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;
+}
+
+/* Registers we shouldn't try to store. */
+#if !defined (CANNOT_STORE_REGISTER)
+#define CANNOT_STORE_REGISTER(regno) 0
+#endif
+
+/* Store VALUE, into the raw contents of register number REGNO. */
void
write_register (regno, val)
- int regno, val;
+ int regno;
+ LONGEST val;
{
- /* This loses when REGISTER_RAW_SIZE (regno) != sizeof (int) */
-#if defined(sun4)
- /* This is a no-op on a Sun 4. */
- if (regno == 0)
+ 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;
-#endif
- *(int *) ®isters[REGISTER_BYTE (regno)] = val;
+ if (registers_pid != inferior_pid)
+ {
+ registers_changed ();
+ registers_pid = inferior_pid;
+ }
- if (have_inferior_p ())
- store_inferior_registers (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]
+ && 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);
+}
+
+static void
+write_register_pid (regno, val, pid)
+ int regno;
+ LONGEST 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.
int regno;
char *val;
{
- bcopy (val, ®isters[REGISTER_BYTE (regno)], REGISTER_RAW_SIZE (regno));
+ if (registers_pid != inferior_pid)
+ {
+ registers_changed ();
+ registers_pid = inferior_pid;
+ }
+
+ register_valid[regno] = 1;
+ memcpy (®isters[REGISTER_BYTE (regno)], val, 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
+}
+
+
+/* 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. */
+
+CORE_ADDR
+read_pc ()
+{
+#ifdef TARGET_READ_PC
+ return TARGET_READ_PC (inferior_pid);
+#else
+ return ADDR_BITS_REMOVE ((CORE_ADDR) read_register_pid (PC_REGNUM, inferior_pid));
+#endif
+}
+
+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
+}
+
+void
+write_pc (val)
+ CORE_ADDR val;
+{
+#ifdef TARGET_WRITE_PC
+ TARGET_WRITE_PC (val, inferior_pid);
+#else
+ write_register_pid (PC_REGNUM, val, inferior_pid);
+#ifdef NPC_REGNUM
+ write_register_pid (NPC_REGNUM, val + 4, inferior_pid);
+#ifdef NNPC_REGNUM
+ write_register_pid (NNPC_REGNUM, val + 8, inferior_pid);
+#endif
+#endif
+#endif
+}
+
+void
+write_pc_pid (val, pid)
+ CORE_ADDR val;
+ 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
+}
+
+/* Cope with strage ways of getting to the stack and frame pointers */
+
+CORE_ADDR
+read_sp ()
+{
+#ifdef TARGET_READ_SP
+ return TARGET_READ_SP ();
+#else
+ return read_register (SP_REGNUM);
+#endif
+}
+
+void
+write_sp (val)
+ CORE_ADDR val;
+{
+#ifdef TARGET_WRITE_SP
+ TARGET_WRITE_SP (val);
+#else
+ write_register (SP_REGNUM, val);
+#endif
+}
+
+CORE_ADDR
+read_fp ()
+{
+#ifdef TARGET_READ_FP
+ return TARGET_READ_FP ();
+#else
+ return read_register (FP_REGNUM);
+#endif
+}
+
+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
+ 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:
+ return 1;
+
+ case LOC_UNDEF:
+ case LOC_CONST:
+ case LOC_STATIC:
+ 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_OPTIMIZED_OUT:
+ return 0;
+ }
+ return 1;
+}
+
/* Given a struct symbol for a variable,
- and a stack frame address, read the value of the variable
- and return a (pointer to a) struct value containing the value. */
+ 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);
- register CORE_ADDR addr = 0;
- int val = SYMBOL_VALUE (var);
+ CORE_ADDR addr;
register int len;
v = allocate_value (type);
VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */
len = TYPE_LENGTH (type);
- if (frame == 0) frame = selected_frame;
+ if (frame == NULL) frame = selected_frame;
switch (SYMBOL_CLASS (var))
{
case LOC_CONST:
- case LOC_LABEL:
- bcopy (&val, VALUE_CONTENTS (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_CONST_BYTES:
- bcopy (val, VALUE_CONTENTS (v), len);
+ case LOC_LABEL:
+ /* Put the constant back in target format. */
+ store_address (VALUE_CONTENTS_RAW (v), len, SYMBOL_VALUE_ADDRESS (var));
VALUE_LVAL (v) = not_lval;
return v;
+ case LOC_CONST_BYTES:
+ {
+ 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:
- addr = val;
+ addr = SYMBOL_VALUE_ADDRESS (var);
break;
case LOC_ARG:
- fi = get_frame_info (frame);
- addr = val + FRAME_ARGS_ADDRESS (fi);
+ if (frame == NULL)
+ return 0;
+ addr = FRAME_ARGS_ADDRESS (frame);
+ if (!addr)
+ return 0;
+ addr += SYMBOL_VALUE (var);
+ break;
+
+ case LOC_REF_ARG:
+ if (frame == NULL)
+ return 0;
+ addr = FRAME_ARGS_ADDRESS (frame);
+ if (!addr)
+ return 0;
+ addr += SYMBOL_VALUE (var);
+ addr = read_memory_unsigned_integer
+ (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT);
break;
case LOC_LOCAL:
- fi = get_frame_info (frame);
- addr = val + FRAME_LOCALS_ADDRESS (fi);
+ case LOC_LOCAL_ARG:
+ if (frame == NULL)
+ return 0;
+ 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_TYPEDEF:
error ("Cannot look up value of a typedef");
+ break;
case LOC_BLOCK:
VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
case LOC_REGISTER:
case LOC_REGPARM:
- v = value_from_register (type, val, frame);
+ case LOC_REGPARM_ADDR:
+ {
+ struct block *b;
+
+ 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));
+ VALUE_LVAL (v) = lval_memory;
+ }
+ else
+ return value_from_register (type, SYMBOL_VALUE (var), frame);
+ }
+ 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;
}
- read_memory (addr, VALUE_CONTENTS (v), len);
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_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];
CORE_ADDR addr;
- value v = allocate_value (type);
+ 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;
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 mem_stor = 0, reg_stor = 0;
int mem_tracking = 1;
CORE_ADDR last_addr = 0;
+ 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)
{
- int register_index = local_regnum - regnum;
- addr = find_saved_register (frame, local_regnum);
- if (addr == 0)
+ int page_regnum;
+
+ switch (regnum)
{
- read_register_bytes (REGISTER_BYTE (local_regnum),
- value_bytes + value_bytes_copied,
- REGISTER_RAW_SIZE (local_regnum));
- reg_stor++;
+ 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
{
- read_memory (addr, value_bytes + value_bytes_copied,
- REGISTER_RAW_SIZE (local_regnum));
mem_stor++;
- 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 (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))
else if (mem_stor)
{
VALUE_LVAL (v) = lval_memory;
- VALUE_ADDRESS (v) = find_saved_register (frame, regnum);
+ VALUE_ADDRESS (v) = first_addr;
}
else if (reg_stor)
{
VALUE_LVAL (v) = lval_register;
- VALUE_ADDRESS (v) = REGISTER_BYTE (regnum);
+ 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 inegral number of registers. Otherwise, you'd need to do
+ 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 (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;
}
/* 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 raw data to virtual format if necessary. */
- addr = find_saved_register (frame, regnum);
- if (addr == 0)
- {
- /* Value is really in a register. */
-
- VALUE_LVAL (v) = lval_register;
- VALUE_ADDRESS (v) = REGISTER_BYTE (regnum);
-
- read_register_bytes (REGISTER_BYTE (regnum),
- raw_buffer, REGISTER_RAW_SIZE (regnum));
- }
- else
- {
- /* Value was in a register that has been saved in memory. */
-
- read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
- VALUE_LVAL (v) = lval_memory;
- 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);
-
+#ifdef REGISTER_CONVERTIBLE
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 (v), len);
- v = value_cast (type, v);
- }
- else
- bcopy (virtual_buffer, VALUE_CONTENTS (v), len);
+ REGISTER_CONVERT_TO_VIRTUAL (regnum, type,
+ raw_buffer, VALUE_CONTENTS_RAW (v));
}
else
+#endif
{
/* Raw and virtual formats are the same for this register. */
-
-#ifdef BYTES_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 (v), len);
+
+ memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len);
}
return v;
}
\f
-/* Given a struct symbol for a variable,
- and a stack frame address,
- return a (pointer to a) struct value containing the variable's address. */
+/* 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
+value_ptr
locate_var_value (var, frame)
register struct symbol *var;
- FRAME frame;
+ struct frame_info *frame;
{
- register CORE_ADDR addr = 0;
- int val = SYMBOL_VALUE (var);
- struct frame_info *fi;
+ CORE_ADDR addr = 0;
struct type *type = SYMBOL_TYPE (var);
+ value_ptr lazy_value;
- if (frame == 0) frame = selected_frame;
+ /* Evaluate it first; if the result is a memory address, we're fine.
+ Lazy evaluation pays off here. */
- switch (SYMBOL_CLASS (var))
+ 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)
{
- case LOC_CONST:
- case LOC_CONST_BYTES:
- error ("Address requested for identifier \"%s\" which is a constant.",
- SYMBOL_NAME (var));
+ addr = VALUE_ADDRESS (lazy_value);
+ return value_from_longest (lookup_pointer_type (type), (LONGEST) addr);
+ }
- case LOC_REGISTER:
- case LOC_REGPARM:
- addr = find_saved_register (frame, val);
- if (addr != 0)
- {
- int len = TYPE_LENGTH (type);
-#ifdef BYTES_BIG_ENDIAN
- if (len < REGISTER_RAW_SIZE (val))
- /* Big-endian, and we want less than full size. */
- addr += REGISTER_RAW_SIZE (val) - len;
-#endif
- break;
- }
+ /* 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_NAME (var));
-
- case LOC_STATIC:
- case LOC_LABEL:
- addr = val;
+ SYMBOL_SOURCE_NAME (var));
break;
- case LOC_ARG:
- fi = get_frame_info (frame);
- addr = val + FRAME_ARGS_ADDRESS (fi);
- break;
-
- case LOC_LOCAL:
- fi = get_frame_info (frame);
- addr = val + FRAME_LOCALS_ADDRESS (fi);
- break;
-
- case LOC_TYPEDEF:
- error ("Address requested for identifier \"%s\" which is a typedef.",
- SYMBOL_NAME (var));
-
- case LOC_BLOCK:
- addr = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
+ default:
+ error ("Can't take address of \"%s\" which isn't an lvalue.",
+ SYMBOL_SOURCE_NAME (var));
break;
}
-
- return value_cast (lookup_pointer_type (type),
- value_from_long (builtin_type_long, (LONGEST) addr));
+ return 0; /* For lint -- never reached */
}
-