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* regcache.h: Update copyright.

Browse source 
(struct regcache, struct gdbarch): Add opaque declarations.
(current_regcache): Declare global variable.
(regcache_read, regcache_write): Add gdbarch parameter.
(regcache_save, regcache_save_no_passthrough)
(regcache_restore, regcache_restore_no_passthrough)
(regcache_dup, regcache_dup_no_passthrough)
(regcache_cpy, regcache_cpy_no_passthrough)
(deprecated_grub_regcache_for_registers)
(deprecated_grub_regcache_for_register_valid)
(regcache_valid_p): Add function declarations.

* regcache.c: Update copyright.
(regcache_descr_handle): New global variable.
(struct regcache_descr): Define.
(init_legacy_regcache_descr, init_regcache_descr): New functions.
(regcache_descr, xfree_regcache_descr): New functions.
(struct regcache): Define.
(regcache_xmalloc, regcache_xfree): New functions.
(regcache_cpy, regcache_cpy_no_passthrough): New functions.
(regcache_dup, regcache_dup_no_passthrough): New functions.
(regcache_valid_p, regcache_read_as_address): New functions.
(deprecated_grub_regcache_for_registers): New function.
(deprecated_grub_regcache_for_register_valid): New function.
(current_regcache): New global variable.
(register_buffer): Add regcache parameter.  Update calls.
(regcache_read, regcache_write): Add regcache parameter.  Rewrite.
(read_register_gen, write_register_gen): Update register_buffer
call.  Test for legacy_p instead of gdbarch_register_read_p or
gdbarch_register_write_p.
(regcache_collect): Update register_buffer call.
(build_regcache): Rewrite.  Use deprecated grub functions.
(regcache_save, regcache_save_no_passthrough): New functions.
(regcache_restore, regcache_restore_no_passthrough): New
functions.
(_initialize_regcache): Create the regcache_data_handle. Swap
current_regcache global variable.

* sh-tdep.c (sh_pseudo_register_read): Add current_regcache
parameter to regcache_read and regcache_write calls.
(sh4_register_read): Ditto.
(sh64_pseudo_register_read): Ditto.
(sh64_register_read): Ditto.
(sh_pseudo_register_write): Ditto.
(sh4_register_write): Ditto.
(sh64_pseudo_register_write): Ditto.
(sh64_register_write): Ditto.

* defs.h (XCALLOC): Define.
This commit is contained in:
Andrew Cagney 2002-06-20 03:13:51 +00:00
parent e1820627dc
commit 3fadccb31d
5 changed files with 620 additions and 94 deletions
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52
gdb/ChangeLog
View file

@ -1,3 +1,55 @@
2002-06-19 Andrew Cagney <cagney@redhat.com>
* regcache.h: Update copyright.
(struct regcache, struct gdbarch): Add opaque declarations.
(current_regcache): Declare global variable.
(regcache_read, regcache_write): Add gdbarch parameter.
(regcache_save, regcache_save_no_passthrough)
(regcache_restore, regcache_restore_no_passthrough)
(regcache_dup, regcache_dup_no_passthrough)
(regcache_cpy, regcache_cpy_no_passthrough)
(deprecated_grub_regcache_for_registers)
(deprecated_grub_regcache_for_register_valid)
(regcache_valid_p): Add function declarations.
* regcache.c: Update copyright.
(regcache_descr_handle): New global variable.
(struct regcache_descr): Define.
(init_legacy_regcache_descr, init_regcache_descr): New functions.
(regcache_descr, xfree_regcache_descr): New functions.
(struct regcache): Define.
(regcache_xmalloc, regcache_xfree): New functions.
(regcache_cpy, regcache_cpy_no_passthrough): New functions.
(regcache_dup, regcache_dup_no_passthrough): New functions.
(regcache_valid_p, regcache_read_as_address): New functions.
(deprecated_grub_regcache_for_registers): New function.
(deprecated_grub_regcache_for_register_valid): New function.
(current_regcache): New global variable.
(register_buffer): Add regcache parameter. Update calls.
(regcache_read, regcache_write): Add regcache parameter. Rewrite.
(read_register_gen, write_register_gen): Update register_buffer
call. Test for legacy_p instead of gdbarch_register_read_p or
gdbarch_register_write_p.
(regcache_collect): Update register_buffer call.
(build_regcache): Rewrite. Use deprecated grub functions.
(regcache_save, regcache_save_no_passthrough): New functions.
(regcache_restore, regcache_restore_no_passthrough): New
functions.
(_initialize_regcache): Create the regcache_data_handle. Swap
current_regcache global variable.
* sh-tdep.c (sh_pseudo_register_read): Add current_regcache
parameter to regcache_read and regcache_write calls.
(sh4_register_read): Ditto.
(sh64_pseudo_register_read): Ditto.
(sh64_register_read): Ditto.
(sh_pseudo_register_write): Ditto.
(sh4_register_write): Ditto.
(sh64_pseudo_register_write): Ditto.
(sh64_register_write): Ditto.
* defs.h (XCALLOC): Define.
2002-06-19 Grace Sainsbury <graces@redhat.com>
* config/m68k/tm-m68k.h (GDB_MULTI_ARCH): Added (set to 0).

3
gdb/defs.h
View file

@ -844,10 +844,11 @@ extern void xmfree (void *md, void *ptr);
"libiberty.h". */
extern void xfree (void *);
/* Utility macro to allocate typed memory. Avoids errors like
/* Utility macros to allocate typed memory. Avoids errors like
``struct foo *foo = xmalloc (sizeof bar)'' and ``struct foo *foo =
(struct foo *) xmalloc (sizeof bar)''. */
#define XMALLOC(TYPE) ((TYPE*) xmalloc (sizeof (TYPE)))
#define XCALLOC(NMEMB, TYPE) ((TYPE*) xcalloc ((NMEMB), sizeof (TYPE)))
/* Like asprintf/vasprintf but get an internal_error if the call
fails. */

532
gdb/regcache.c
View file

@ -1,6 +1,7 @@
/* Cache and manage the values of registers for GDB, the GNU debugger.
Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, 2001
Free Software Foundation, Inc.
Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000,
2001, 2002 Free Software Foundation, Inc.
This file is part of GDB.
@ -33,6 +34,349 @@
* Here is the actual register cache.
*/
/* Per-architecture object describing the layout of a register cache.
Computed once when the architecture is created */
struct gdbarch_data *regcache_descr_handle;
struct regcache_descr
{
/* The architecture this descriptor belongs to. */
struct gdbarch *gdbarch;
/* Is this a ``legacy'' register cache? Such caches reserve space
for raw and pseudo registers and allow access to both. */
int legacy_p;
/* The raw register cache. This should contain just [0
.. NUM_RAW_REGISTERS). However, for older targets, it contains
space for the full [0 .. NUM_RAW_REGISTERS +
NUM_PSEUDO_REGISTERS). */
int nr_raw_registers;
long sizeof_raw_registers;
long sizeof_raw_register_valid_p;
/* Offset, in bytes, of reach register in the raw register cache.
Pseudo registers have an offset even though they don't
(shouldn't) have a correspoinding space in the register cache.
It is to keep existing code, that relies on
write/write_register_bytes working. */
long *register_offset;
/* The cooked / frame / virtual register space. The registers in
the range [0..NR_RAW_REGISTERS) should be mapped directly onto
the corresponding raw register. The next [NR_RAW_REGISTERS
.. NR_REGISTERS) should have been mapped, via
gdbarch_register_read/write onto either raw registers or memory. */
int nr_registers;
long *sizeof_register;
long max_register_size;
};
static void *
init_legacy_regcache_descr (struct gdbarch *gdbarch)
{
int i;
struct regcache_descr *descr;
/* FIXME: cagney/2002-05-11: gdbarch_data() should take that
``gdbarch'' as a parameter. */
gdb_assert (gdbarch != NULL);
descr = XMALLOC (struct regcache_descr);
descr->gdbarch = gdbarch;
descr->legacy_p = 1;
/* FIXME: cagney/2002-05-11: Shouldn't be including pseudo-registers
in the register buffer. Unfortunatly some architectures do. */
descr->nr_registers = NUM_REGS + NUM_PSEUDO_REGS;
descr->nr_raw_registers = descr->nr_registers;
descr->sizeof_raw_register_valid_p = descr->nr_registers;
/* FIXME: cagney/2002-05-11: Instead of using REGISTER_BYTE() this
code should compute the offets et.al. at runtime. This currently
isn't possible because some targets overlap register locations -
see the mess in read_register_bytes() and write_register_bytes()
registers. */
descr->sizeof_register = XCALLOC (descr->nr_registers, long);
descr->register_offset = XCALLOC (descr->nr_registers, long);
descr->max_register_size = 0;
for (i = 0; i < descr->nr_registers; i++)
{
descr->register_offset[i] = REGISTER_BYTE (i);
descr->sizeof_register[i] = REGISTER_RAW_SIZE (i);
if (descr->max_register_size < REGISTER_RAW_SIZE (i))
descr->max_register_size = REGISTER_RAW_SIZE (i);
}
/* Come up with the real size of the registers buffer. */
descr->sizeof_raw_registers = REGISTER_BYTES; /* OK use. */
for (i = 0; i < descr->nr_registers; i++)
{
long regend;
/* Keep extending the buffer so that there is always enough
space for all registers. The comparison is necessary since
legacy code is free to put registers in random places in the
buffer separated by holes. Once REGISTER_BYTE() is killed
this can be greatly simplified. */
/* FIXME: cagney/2001-12-04: This code shouldn't need to use
REGISTER_BYTE(). Unfortunatly, legacy code likes to lay the
buffer out so that certain registers just happen to overlap.
Ulgh! New targets use gdbarch's register read/write and
entirely avoid this uglyness. */
regend = descr->register_offset[i] + descr->sizeof_register[i];
if (descr->sizeof_raw_registers < regend)
descr->sizeof_raw_registers = regend;
}
return descr;
}
static void *
init_regcache_descr (struct gdbarch *gdbarch)
{
int i;
struct regcache_descr *descr;
gdb_assert (gdbarch != NULL);
/* If an old style architecture, construct the register cache
description using all the register macros. */
if (!gdbarch_register_read_p (gdbarch)
&& !gdbarch_register_write_p (gdbarch))
return init_legacy_regcache_descr (gdbarch);
descr = XMALLOC (struct regcache_descr);
descr->gdbarch = gdbarch;
descr->legacy_p = 0;
/* Total size of the register space. The raw registers should
directly map onto the raw register cache while the pseudo's are
either mapped onto raw-registers or memory. */
descr->nr_registers = NUM_REGS + NUM_PSEUDO_REGS;
/* Construct a strictly RAW register cache. Don't allow pseudo's
into the register cache. */
descr->nr_raw_registers = NUM_REGS;
descr->sizeof_raw_register_valid_p = NUM_REGS;
/* Lay out the register cache. The pseud-registers are included in
the layout even though their value isn't stored in the register
cache. Some code, via read_register_bytes() access a register
using an offset/length rather than a register number.
NOTE: cagney/2002-05-22: Only REGISTER_VIRTUAL_TYPE() needs to be
used when constructing the register cache. It is assumed that
register raw size, virtual size and type length of the type are
all the same. */
{
long offset = 0;
descr->sizeof_register = XCALLOC (descr->nr_registers, long);
descr->register_offset = XCALLOC (descr->nr_registers, long);
descr->max_register_size = 0;
for (i = 0; i < descr->nr_registers; i++)
{
descr->sizeof_register[i] = TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (i));
descr->register_offset[i] = offset;
offset += descr->sizeof_register[i];
if (descr->max_register_size < descr->sizeof_register[i])
descr->max_register_size = descr->sizeof_register[i];
}
/* Set the real size of the register cache buffer. */
/* FIXME: cagney/2002-05-22: Should only need to allocate space
for the raw registers. Unfortunatly some code still accesses
the register array directly using the global registers[].
Until that code has been purged, play safe and over allocating
the register buffer. Ulgh! */
descr->sizeof_raw_registers = offset;
/* = descr->register_offset[descr->nr_raw_registers]; */
}
#if 0
/* Sanity check. Confirm that the assumptions about gdbarch are
true. The REGCACHE_DESCR_HANDLE is set before doing the checks
so that targets using the generic methods supplied by regcache
don't go into infinite recursion trying to, again, create the
regcache. */
set_gdbarch_data (gdbarch, regcache_descr_handle, descr);
for (i = 0; i < descr->nr_registers; i++)
{
gdb_assert (descr->sizeof_register[i] == REGISTER_RAW_SIZE (i));
gdb_assert (descr->sizeof_register[i] == REGISTER_VIRTUAL_SIZE (i));
gdb_assert (descr->register_offset[i] == REGISTER_BYTE (i));
}
/* gdb_assert (descr->sizeof_raw_registers == REGISTER_BYTES (i)); */
#endif
return descr;
}
static struct regcache_descr *
regcache_descr (struct gdbarch *gdbarch)
{
return gdbarch_data (gdbarch, regcache_descr_handle);
}
static void
xfree_regcache_descr (struct gdbarch *gdbarch, void *ptr)
{
struct regcache_descr *descr = ptr;
if (descr == NULL)
return;
xfree (descr->register_offset);
xfree (descr->sizeof_register);
descr->register_offset = NULL;
descr->sizeof_register = NULL;
xfree (descr);
}
/* The register cache for storing raw register values. */
struct regcache
{
struct regcache_descr *descr;
char *raw_registers;
char *raw_register_valid_p;
/* If a value isn't in the cache should the corresponding target be
queried for a value. */
int passthrough_p;
};
struct regcache *
regcache_xmalloc (struct gdbarch *gdbarch)
{
struct regcache_descr *descr;
struct regcache *regcache;
gdb_assert (gdbarch != NULL);
descr = regcache_descr (gdbarch);
regcache = XMALLOC (struct regcache);
regcache->descr = descr;
regcache->raw_registers
= XCALLOC (descr->sizeof_raw_registers, char);
regcache->raw_register_valid_p
= XCALLOC (descr->sizeof_raw_register_valid_p, char);
regcache->passthrough_p = 0;
return regcache;
}
void
regcache_xfree (struct regcache *regcache)
{
if (regcache == NULL)
return;
xfree (regcache->raw_registers);
xfree (regcache->raw_register_valid_p);
xfree (regcache);
}
void
regcache_cpy (struct regcache *dst, struct regcache *src)
{
int i;
char *buf;
gdb_assert (src != NULL && dst != NULL);
gdb_assert (src->descr->gdbarch == dst->descr->gdbarch);
gdb_assert (src != dst);
/* FIXME: cagney/2002-05-17: To say this bit is bad is being polite.
It keeps the existing code working where things rely on going
through to the register cache. */
if (src == current_regcache && src->descr->legacy_p)
{
/* ULGH!!!! Old way. Use REGISTER bytes and let code below
untangle fetch. */
read_register_bytes (0, dst->raw_registers, REGISTER_BYTES);
return;
}
/* FIXME: cagney/2002-05-17: To say this bit is bad is being polite.
It keeps the existing code working where things rely on going
through to the register cache. */
if (dst == current_regcache && dst->descr->legacy_p)
{
/* ULGH!!!! Old way. Use REGISTER bytes and let code below
untangle fetch. */
write_register_bytes (0, src->raw_registers, REGISTER_BYTES);
return;
}
buf = alloca (src->descr->max_register_size);
for (i = 0; i < src->descr->nr_raw_registers; i++)
{
/* Should we worry about the valid bit here? */
regcache_read (src, i, buf);
regcache_write (dst, i, buf);
}
}
void
regcache_cpy_no_passthrough (struct regcache *dst, struct regcache *src)
{
int i;
gdb_assert (src != NULL && dst != NULL);
gdb_assert (src->descr->gdbarch == dst->descr->gdbarch);
/* NOTE: cagney/2002-05-17: Don't let the caller do a no-passthrough
move of data into the current_regcache(). Doing this would be
silly - it would mean that valid_p would be completly invalid. */
gdb_assert (dst != current_regcache);
memcpy (dst->raw_registers, src->raw_registers,
dst->descr->sizeof_raw_registers);
memcpy (dst->raw_register_valid_p, src->raw_register_valid_p,
dst->descr->sizeof_raw_register_valid_p);
}
struct regcache *
regcache_dup (struct regcache *src)
{
struct regcache *newbuf;
gdb_assert (current_regcache != NULL);
newbuf = regcache_xmalloc (src->descr->gdbarch);
regcache_cpy (newbuf, src);
return newbuf;
}
struct regcache *
regcache_dup_no_passthrough (struct regcache *src)
{
struct regcache *newbuf;
gdb_assert (current_regcache != NULL);
newbuf = regcache_xmalloc (src->descr->gdbarch);
regcache_cpy_no_passthrough (newbuf, src);
return newbuf;
}
int
regcache_valid_p (struct regcache *regcache, int regnum)
{
gdb_assert (regcache != NULL);
gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
return regcache->raw_register_valid_p[regnum];
}
CORE_ADDR
regcache_read_as_address (struct regcache *regcache, int regnum)
{
char *buf;
gdb_assert (regcache != NULL);
gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
buf = alloca (regcache->descr->sizeof_register[regnum]);
regcache_read (regcache, regnum, buf);
return extract_address (buf, regcache->descr->sizeof_register[regnum]);
}
char *
deprecated_grub_regcache_for_registers (struct regcache *regcache)
{
return regcache->raw_registers;
}
char *
deprecated_grub_regcache_for_register_valid (struct regcache *regcache)
{
return regcache->raw_register_valid_p;
}
/* Global structure containing the current regcache. */
/* FIXME: cagney/2002-05-11: The two global arrays registers[] and
register_valid[] currently point into this structure. */
struct regcache *current_regcache;
/* NOTE: this is a write-through cache. There is no "dirty" bit for
recording if the register values have been changed (eg. by the
user). Therefore all registers must be written back to the
@ -97,10 +441,9 @@ register_changed (int regnum)
else return a pointer to the start of the cache buffer. */
static char *
register_buffer (int regnum)
register_buffer (struct regcache *regcache, int regnum)
{
gdb_assert (regnum >= 0 && regnum < (NUM_REGS + NUM_PSEUDO_REGS));
return &registers[REGISTER_BYTE (regnum)];
return regcache->raw_registers + regcache->descr->register_offset[regnum];
}
/* Return whether register REGNUM is a real register. */
@ -311,22 +654,52 @@ legacy_read_register_gen (int regnum, char *myaddr)
if (!register_cached (regnum))
fetch_register (regnum);
memcpy (myaddr, register_buffer (regnum),
memcpy (myaddr, register_buffer (current_regcache, regnum),
REGISTER_RAW_SIZE (regnum));
}
void
regcache_read (int rawnum, char *buf)
regcache_read (struct regcache *regcache, int regnum, char *buf)
{
gdb_assert (rawnum >= 0 && rawnum < (NUM_REGS + NUM_PSEUDO_REGS));
/* For moment, just use underlying legacy code. Ulgh!!! */
legacy_read_register_gen (rawnum, buf);
gdb_assert (regcache != NULL && buf != NULL);
gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
if (regcache->descr->legacy_p
&& regcache->passthrough_p)
{
gdb_assert (regcache == current_regcache);
/* For moment, just use underlying legacy code. Ulgh!!! This
silently and very indirectly updates the regcache's regcache
via the global register_valid[]. */
legacy_read_register_gen (regnum, buf);
return;
}
/* Make certain that the register cache is up-to-date with respect
to the current thread. This switching shouldn't be necessary
only there is still only one target side register cache. Sigh!
On the bright side, at least there is a regcache object. */
if (regcache->passthrough_p)
{
gdb_assert (regcache == current_regcache);
if (! ptid_equal (registers_ptid, inferior_ptid))
{
registers_changed ();
registers_ptid = inferior_ptid;
}
if (!register_cached (regnum))
fetch_register (regnum);
}
/* Copy the value directly into the register cache. */
memcpy (buf, (regcache->raw_registers
+ regcache->descr->register_offset[regnum]),
regcache->descr->sizeof_register[regnum]);
}
void
read_register_gen (int regnum, char *buf)
{
if (! gdbarch_register_read_p (current_gdbarch))
gdb_assert (current_regcache != NULL);
gdb_assert (current_regcache->descr->gdbarch == current_gdbarch);
if (current_regcache->descr->legacy_p)
{
legacy_read_register_gen (regnum, buf);
return;
@ -362,30 +735,80 @@ legacy_write_register_gen (int regnum, char *myaddr)
/* If we have a valid copy of the register, and new value == old
value, then don't bother doing the actual store. */
if (register_cached (regnum)
&& memcmp (register_buffer (regnum), myaddr, size) == 0)
&& (memcmp (register_buffer (current_regcache, regnum), myaddr, size)
== 0))
return;
else
target_prepare_to_store ();
}
memcpy (register_buffer (regnum), myaddr, size);
memcpy (register_buffer (current_regcache, regnum), myaddr, size);
set_register_cached (regnum, 1);
store_register (regnum);
}
void
regcache_write (int rawnum, char *buf)
regcache_write (struct regcache *regcache, int regnum, char *buf)
{
gdb_assert (rawnum >= 0 && rawnum < (NUM_REGS + NUM_PSEUDO_REGS));
/* For moment, just use underlying legacy code. Ulgh!!! */
legacy_write_register_gen (rawnum, buf);
gdb_assert (regcache != NULL && buf != NULL);
gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
if (regcache->passthrough_p
&& regcache->descr->legacy_p)
{
/* For moment, just use underlying legacy code. Ulgh!!! This
silently and very indirectly updates the regcache's buffers
via the globals register_valid[] and registers[]. */
gdb_assert (regcache == current_regcache);
legacy_write_register_gen (regnum, buf);
return;
}
/* 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 (regnum))
return;
/* Handle the simple case first -> not write through so just store
value in cache. */
if (!regcache->passthrough_p)
{
memcpy ((regcache->raw_registers
+ regcache->descr->register_offset[regnum]), buf,
regcache->descr->sizeof_register[regnum]);
regcache->raw_register_valid_p[regnum] = 1;
return;
}
/* Make certain that the correct cache is selected. */
gdb_assert (regcache == current_regcache);
if (! ptid_equal (registers_ptid, inferior_ptid))
{
registers_changed ();
registers_ptid = inferior_ptid;
}
/* If we have a valid copy of the register, and new value == old
value, then don't bother doing the actual store. */
if (regcache_valid_p (regcache, regnum)
&& (memcmp (register_buffer (regcache, regnum), buf,
regcache->descr->sizeof_register[regnum]) == 0))
return;
target_prepare_to_store ();
memcpy (register_buffer (regcache, regnum), buf,
regcache->descr->sizeof_register[regnum]);
regcache->raw_register_valid_p[regnum] = 1;
store_register (regnum);
}
void
write_register_gen (int regnum, char *buf)
{
if (! gdbarch_register_write_p (current_gdbarch))
gdb_assert (current_regcache != NULL);
gdb_assert (current_regcache->descr->gdbarch == current_gdbarch);
if (current_regcache->descr->legacy_p)
{
legacy_write_register_gen (regnum, buf);
return;
@ -564,10 +987,10 @@ supply_register (int regnum, char *val)
set_register_cached (regnum, 1);
if (val)
memcpy (register_buffer (regnum), val,
memcpy (register_buffer (current_regcache, regnum), val,
REGISTER_RAW_SIZE (regnum));
else
memset (register_buffer (regnum), '\000',
memset (register_buffer (current_regcache, regnum), '\000',
REGISTER_RAW_SIZE (regnum));
/* On some architectures, e.g. HPPA, there are a few stray bits in
@ -587,7 +1010,8 @@ supply_register (int regnum, char *val)
void
regcache_collect (int regnum, void *buf)
{
memcpy (buf, register_buffer (regnum), REGISTER_RAW_SIZE (regnum));
memcpy (buf, register_buffer (current_regcache, regnum),
REGISTER_RAW_SIZE (regnum));
}
@ -754,38 +1178,54 @@ reg_flush_command (char *command, int from_tty)
static void
build_regcache (void)
{
current_regcache = regcache_xmalloc (current_gdbarch);
current_regcache->passthrough_p = 1;
registers = deprecated_grub_regcache_for_registers (current_regcache);
register_valid = deprecated_grub_regcache_for_register_valid (current_regcache);
}
void
regcache_save (struct regcache *regcache)
{
int i;
int sizeof_register_valid;
/* Come up with the real size of the registers buffer. */
int sizeof_registers = REGISTER_BYTES; /* OK use. */
for (i = 0; i < NUM_REGS + NUM_PSEUDO_REGS; i++)
{
long regend;
/* Keep extending the buffer so that there is always enough
space for all registers. The comparison is necessary since
legacy code is free to put registers in random places in the
buffer separated by holes. Once REGISTER_BYTE() is killed
this can be greatly simplified. */
/* FIXME: cagney/2001-12-04: This code shouldn't need to use
REGISTER_BYTE(). Unfortunatly, legacy code likes to lay the
buffer out so that certain registers just happen to overlap.
Ulgh! New targets use gdbarch's register read/write and
entirely avoid this uglyness. */
regend = REGISTER_BYTE (i) + REGISTER_RAW_SIZE (i);
if (sizeof_registers < regend)
sizeof_registers = regend;
}
registers = xmalloc (sizeof_registers);
sizeof_register_valid = ((NUM_REGS + NUM_PSEUDO_REGS)
* sizeof (*register_valid));
register_valid = xmalloc (sizeof_register_valid);
memset (register_valid, 0, sizeof_register_valid);
gdb_assert (current_regcache != NULL && regcache != NULL);
gdb_assert (current_regcache->descr->gdbarch == regcache->descr->gdbarch);
regcache_cpy (regcache, current_regcache);
}
void
regcache_save_no_passthrough (struct regcache *regcache)
{
gdb_assert (current_regcache != NULL && regcache != NULL);
gdb_assert (current_regcache->descr->gdbarch == regcache->descr->gdbarch);
regcache_cpy_no_passthrough (regcache, current_regcache);
}
void
regcache_restore (struct regcache *regcache)
{
int i;
gdb_assert (current_regcache != NULL && regcache != NULL);
gdb_assert (current_regcache->descr->gdbarch == regcache->descr->gdbarch);
regcache_cpy (current_regcache, regcache);
}
void
regcache_restore_no_passthrough (struct regcache *regcache)
{
char *regcache_registers;
gdb_assert (current_regcache != NULL && regcache != NULL);
gdb_assert (current_regcache->descr->gdbarch == regcache->descr->gdbarch);
regcache_cpy_no_passthrough (current_regcache, regcache);
}
void
_initialize_regcache (void)
{
regcache_descr_handle = register_gdbarch_data (init_regcache_descr,
xfree_regcache_descr);
REGISTER_GDBARCH_SWAP (current_regcache);
register_gdbarch_swap (&registers, sizeof (registers), NULL);
register_gdbarch_swap (&register_valid, sizeof (register_valid), NULL);
register_gdbarch_swap (NULL, 0, build_regcache);

38
gdb/regcache.h
View file

@ -1,6 +1,7 @@
/* Cache and manage the values of registers for GDB, the GNU debugger.
Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, 2001
Free Software Foundation, Inc.
Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000,
2001, 2002 Free Software Foundation, Inc.
This file is part of GDB.
@ -22,11 +23,21 @@
#ifndef REGCACHE_H
#define REGCACHE_H
struct regcache;
struct gdbarch;
extern struct regcache *current_regcache;
void regcache_xfree (struct regcache *regcache);
struct regcache *regcache_xmalloc (struct gdbarch *gdbarch);
/* Transfer a raw register [0..NUM_REGS) between core-gdb and the
regcache. */
void regcache_read (int rawnum, char *buf);
void regcache_write (int rawnum, char *buf);
void regcache_read (struct regcache *regcache, int rawnum, char *buf);
void regcache_write (struct regcache *regcache, int rawnum, char *buf);
int regcache_valid_p (struct regcache *regcache, int regnum);
CORE_ADDR regcache_read_as_address (struct regcache *regcache, int rawnum);
/* Transfer a raw register [0..NUM_REGS) between the regcache and the
target. These functions are called by the target in response to a
@ -47,6 +58,25 @@ extern char *registers;
extern signed char *register_valid;
/* Save/restore the register cache using the regbuf. The operation is
write through - it is strictly for code that needs to restore the
target's registers to a previous state.
``no passthrough'' versions do not go through to the target. They
only save values already in the cache. */
extern void regcache_save (struct regcache *regcache);
extern void regcache_restore (struct regcache *regcache);
extern struct regcache *regcache_dup (struct regcache *regcache);
extern void regcache_save_no_passthrough (struct regcache *regcache);
extern void regcache_restore_no_passthrough (struct regcache *regcache);
extern struct regcache *regcache_dup_no_passthrough (struct regcache *regcache);
extern void regcache_cpy (struct regcache *dest, struct regcache *src);
extern void regcache_cpy_no_passthrough (struct regcache *dest, struct regcache *src);
extern char *deprecated_grub_regcache_for_registers (struct regcache *);
extern char *deprecated_grub_regcache_for_register_valid (struct regcache *);
extern int register_cached (int regnum);
extern void set_register_cached (int regnum, int state);

89
gdb/sh-tdep.c
View file

@ -3385,9 +3385,9 @@ sh_pseudo_register_read (int reg_nr, char *buffer)
/* Build the value in the provided buffer. */
/* Read the real regs for which this one is an alias. */
for (portion = 0; portion < 2; portion++)
regcache_read (base_regnum + portion,
temp_buffer
+ REGISTER_RAW_SIZE (base_regnum) * portion);
regcache_read (current_regcache, base_regnum + portion,
(temp_buffer
+ REGISTER_RAW_SIZE (base_regnum) * portion));
/* We must pay attention to the endiannes. */
sh_sh4_register_convert_to_virtual (reg_nr,
REGISTER_VIRTUAL_TYPE (reg_nr),
@ -3400,7 +3400,7 @@ sh_pseudo_register_read (int reg_nr, char *buffer)
/* Read the real regs for which this one is an alias. */
for (portion = 0; portion < 4; portion++)
regcache_read (base_regnum + portion,
regcache_read (current_regcache, base_regnum + portion,
buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
}
}
@ -3410,7 +3410,7 @@ sh4_register_read (struct gdbarch *gdbarch, int reg_nr, char *buffer)
{
if (reg_nr >= 0 && reg_nr < gdbarch_tdep (current_gdbarch)->DR0_REGNUM)
/* It is a regular register. */
regcache_read (reg_nr, buffer);
regcache_read (current_regcache, reg_nr, buffer);
else
/* It is a pseudo register and we need to construct its value */
sh_pseudo_register_read (reg_nr, buffer);
@ -3434,9 +3434,9 @@ sh64_pseudo_register_read (int reg_nr, char *buffer)
/* DR regs are double precision registers obtained by
concatenating 2 single precision floating point registers. */
for (portion = 0; portion < 2; portion++)
regcache_read (base_regnum + portion,
temp_buffer
+ REGISTER_RAW_SIZE (base_regnum) * portion);
regcache_read (current_regcache, base_regnum + portion,
(temp_buffer
+ REGISTER_RAW_SIZE (base_regnum) * portion));
/* We must pay attention to the endiannes. */
sh_sh64_register_convert_to_virtual (reg_nr, REGISTER_VIRTUAL_TYPE (reg_nr),
@ -3453,8 +3453,8 @@ sh64_pseudo_register_read (int reg_nr, char *buffer)
/* FPP regs are pairs of single precision registers obtained by
concatenating 2 single precision floating point registers. */
for (portion = 0; portion < 2; portion++)
regcache_read (base_regnum + portion,
buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
regcache_read (current_regcache, base_regnum + portion,
buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
}
else if (reg_nr >= tdep->FV0_REGNUM
@ -3466,8 +3466,8 @@ sh64_pseudo_register_read (int reg_nr, char *buffer)
/* FV regs are vectors of single precision registers obtained by
concatenating 4 single precision floating point registers. */
for (portion = 0; portion < 4; portion++)
regcache_read (base_regnum + portion,
buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
regcache_read (current_regcache, base_regnum + portion,
buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
}
/* sh compact pseudo registers. 1-to-1 with a shmedia register */
@ -3477,7 +3477,7 @@ sh64_pseudo_register_read (int reg_nr, char *buffer)
base_regnum = sh64_compact_reg_base_num (reg_nr);
/* Build the value in the provided buffer. */
regcache_read (base_regnum, temp_buffer);
regcache_read (current_regcache, base_regnum, temp_buffer);
if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
offset = 4;
memcpy (buffer, temp_buffer + offset, 4); /* get LOWER 32 bits only????*/
@ -3491,7 +3491,7 @@ sh64_pseudo_register_read (int reg_nr, char *buffer)
/* Build the value in the provided buffer. */
/* Floating point registers map 1-1 to the media fp regs,
they have the same size and endienness. */
regcache_read (base_regnum, buffer);
regcache_read (current_regcache, base_regnum, buffer);
}
else if (reg_nr >= tdep->DR0_C_REGNUM
@ -3502,9 +3502,9 @@ sh64_pseudo_register_read (int reg_nr, char *buffer)
/* DR_C regs are double precision registers obtained by
concatenating 2 single precision floating point registers. */
for (portion = 0; portion < 2; portion++)
regcache_read (base_regnum + portion,
temp_buffer
+ REGISTER_RAW_SIZE (base_regnum) * portion);
regcache_read (current_regcache, base_regnum + portion,
(temp_buffer
+ REGISTER_RAW_SIZE (base_regnum) * portion));
/* We must pay attention to the endiannes. */
sh_sh64_register_convert_to_virtual (reg_nr, REGISTER_VIRTUAL_TYPE (reg_nr),
@ -3520,8 +3520,8 @@ sh64_pseudo_register_read (int reg_nr, char *buffer)
/* FV_C regs are vectors of single precision registers obtained by
concatenating 4 single precision floating point registers. */
for (portion = 0; portion < 4; portion++)
regcache_read (base_regnum + portion,
buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
regcache_read (current_regcache, base_regnum + portion,
buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
}
else if (reg_nr == tdep->FPSCR_C_REGNUM)
@ -3552,11 +3552,11 @@ sh64_pseudo_register_read (int reg_nr, char *buffer)
*/
/* *INDENT-ON* */
/* Get FPSCR into a local buffer */
regcache_read (fpscr_base_regnum, temp_buffer);
regcache_read (current_regcache, fpscr_base_regnum, temp_buffer);
/* Get value as an int. */
fpscr_value = extract_unsigned_integer (temp_buffer, 4);
/* Get SR into a local buffer */
regcache_read (sr_base_regnum, temp_buffer);
regcache_read (current_regcache, sr_base_regnum, temp_buffer);
/* Get value as an int. */
sr_value = extract_unsigned_integer (temp_buffer, 4);
/* Build the new value. */
@ -3574,7 +3574,7 @@ sh64_pseudo_register_read (int reg_nr, char *buffer)
/* FPUL_C register is floating point register 32,
same size, same endianness. */
regcache_read (base_regnum, buffer);
regcache_read (current_regcache, base_regnum, buffer);
}
}
@ -3584,7 +3584,7 @@ sh64_register_read (struct gdbarch *gdbarch, int reg_nr, char *buffer)
if (reg_nr >= 0 && reg_nr < gdbarch_tdep (current_gdbarch)->DR0_REGNUM)
/* It is a regular register. */
regcache_read (reg_nr, buffer);
regcache_read (current_regcache, reg_nr, buffer);
else
/* It is a pseudo register and we need to construct its value */
sh64_pseudo_register_read (reg_nr, buffer);
@ -3608,8 +3608,9 @@ sh_pseudo_register_write (int reg_nr, char *buffer)
/* Write the real regs for which this one is an alias. */
for (portion = 0; portion < 2; portion++)
regcache_write (base_regnum + portion,
temp_buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
regcache_write (current_regcache, base_regnum + portion,
(temp_buffer
+ REGISTER_RAW_SIZE (base_regnum) * portion));
}
else if (reg_nr >= tdep->FV0_REGNUM
&& reg_nr <= tdep->FV_LAST_REGNUM)
@ -3618,7 +3619,7 @@ sh_pseudo_register_write (int reg_nr, char *buffer)
/* Write the real regs for which this one is an alias. */
for (portion = 0; portion < 4; portion++)
regcache_write (base_regnum + portion,
regcache_write (current_regcache, base_regnum + portion,
buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
}
}
@ -3628,7 +3629,7 @@ sh4_register_write (struct gdbarch *gdbarch, int reg_nr, char *buffer)
{
if (reg_nr >= 0 && reg_nr < gdbarch_tdep (current_gdbarch)->DR0_REGNUM)
/* It is a regular register. */
regcache_write (reg_nr, buffer);
regcache_write (current_regcache, reg_nr, buffer);
else
/* It is a pseudo register and we need to construct its value */
sh_pseudo_register_write (reg_nr, buffer);
@ -3653,8 +3654,9 @@ sh64_pseudo_register_write (int reg_nr, char *buffer)
/* Write the real regs for which this one is an alias. */
for (portion = 0; portion < 2; portion++)
regcache_write (base_regnum + portion,
temp_buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
regcache_write (current_regcache, base_regnum + portion,
(temp_buffer
+ REGISTER_RAW_SIZE (base_regnum) * portion));
}
else if (reg_nr >= tdep->FPP0_REGNUM
@ -3664,7 +3666,7 @@ sh64_pseudo_register_write (int reg_nr, char *buffer)
/* Write the real regs for which this one is an alias. */
for (portion = 0; portion < 2; portion++)
regcache_write (base_regnum + portion,
regcache_write (current_regcache, base_regnum + portion,
buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
}
@ -3675,7 +3677,7 @@ sh64_pseudo_register_write (int reg_nr, char *buffer)
/* Write the real regs for which this one is an alias. */
for (portion = 0; portion < 4; portion++)
regcache_write (base_regnum + portion,
regcache_write (current_regcache, base_regnum + portion,
buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
}
@ -3693,10 +3695,10 @@ sh64_pseudo_register_write (int reg_nr, char *buffer)
/* Let's read the value of the base register into a temporary
buffer, so that overwriting the last four bytes with the new
value of the pseudo will leave the upper 4 bytes unchanged. */
regcache_read (base_regnum, temp_buffer);
regcache_read (current_regcache, base_regnum, temp_buffer);
/* Write as an 8 byte quantity */
memcpy (temp_buffer + offset, buffer, 4);
regcache_write (base_regnum, temp_buffer);
regcache_write (current_regcache, base_regnum, temp_buffer);
}
/* sh floating point compact pseudo registers. 1-to-1 with a shmedia
@ -3705,7 +3707,7 @@ sh64_pseudo_register_write (int reg_nr, char *buffer)
&& reg_nr <= tdep->FP_LAST_C_REGNUM)
{
base_regnum = sh64_compact_reg_base_num (reg_nr);
regcache_write (base_regnum, buffer);
regcache_write (current_regcache, base_regnum, buffer);
}
else if (reg_nr >= tdep->DR0_C_REGNUM
@ -3718,8 +3720,9 @@ sh64_pseudo_register_write (int reg_nr, char *buffer)
sh_sh64_register_convert_to_raw (REGISTER_VIRTUAL_TYPE (reg_nr), reg_nr,
buffer, temp_buffer);
regcache_write (base_regnum + portion,
temp_buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
regcache_write (current_regcache, base_regnum + portion,
(temp_buffer
+ REGISTER_RAW_SIZE (base_regnum) * portion));
}
}
@ -3730,7 +3733,7 @@ sh64_pseudo_register_write (int reg_nr, char *buffer)
for (portion = 0; portion < 4; portion++)
{
regcache_write (base_regnum + portion,
regcache_write (current_regcache, base_regnum + portion,
buffer + REGISTER_RAW_SIZE (base_regnum) * portion);
}
}
@ -3773,25 +3776,25 @@ sh64_pseudo_register_write (int reg_nr, char *buffer)
fpscr_value = fpscr_c_value & fpscr_mask;
sr_value = (fpscr_value & sr_mask) >> 6;
regcache_read (fpscr_base_regnum, temp_buffer);
regcache_read (current_regcache, fpscr_base_regnum, temp_buffer);
old_fpscr_value = extract_unsigned_integer (temp_buffer, 4);
old_fpscr_value &= 0xfffc0002;
fpscr_value |= old_fpscr_value;
store_unsigned_integer (temp_buffer, 4, fpscr_value);
regcache_write (fpscr_base_regnum, temp_buffer);
regcache_write (current_regcache, fpscr_base_regnum, temp_buffer);
regcache_read (sr_base_regnum, temp_buffer);
regcache_read (current_regcache, sr_base_regnum, temp_buffer);
old_sr_value = extract_unsigned_integer (temp_buffer, 4);
old_sr_value &= 0xffff8fff;
sr_value |= old_sr_value;
store_unsigned_integer (temp_buffer, 4, sr_value);
regcache_write (sr_base_regnum, temp_buffer);
regcache_write (current_regcache, sr_base_regnum, temp_buffer);
}
else if (reg_nr == tdep->FPUL_C_REGNUM)
{
base_regnum = sh64_compact_reg_base_num (reg_nr);
regcache_write (base_regnum, buffer);
regcache_write (current_regcache, base_regnum, buffer);
}
}
@ -3800,7 +3803,7 @@ sh64_register_write (struct gdbarch *gdbarch, int reg_nr, char *buffer)
{
if (reg_nr >= 0 && reg_nr < gdbarch_tdep (current_gdbarch)->DR0_REGNUM)
/* It is a regular register. */
regcache_write (reg_nr, buffer);
regcache_write (current_regcache, reg_nr, buffer);
else
/* It is a pseudo register and we need to construct its value */
sh64_pseudo_register_write (reg_nr, buffer);