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authorPedro Alves <palves@redhat.com>2011-01-25 12:47:25 +0000
committerPedro Alves <palves@redhat.com>2011-01-25 12:47:25 +0000
commitee99023e123b99f55fdf9a99e54e03fea21d3882 (patch)
tree380c1cdc1015c1a4009bebd03e3cc1248d57d1fd /gdb/regcache.c
parent99e42fd82a90f6cd7aec4f521c7afc157ee10807 (diff)
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* regcache.c (struct regcache_descr): Rename
sizeof_raw_register_valid_p field to sizeof_raw_register_status, and sizeof_cooked_register_valid_p to sizeof_cooked_register_status. (init_regcache_descr): Adjust. (struct regcache): Rename register_valid_p field to register_status. (regcache_xmalloc_1, regcache_xfree, regcache_save) (do_cooked_read): Adjust. (regcache_valid_p): Rename to ... (regcache_register_status): ... this. Adjust. (regcache_invalidate): Adjust. (regcache_raw_read, regcache_cooked_read, regcache_raw_write): Adjust. (regcache_raw_supply): Adjust. If buf i NULL, mark the register as unavailable, not valid. (regcache_dump): Adjust. * regcache.h (enum register_status): New. (regcache_register_status): Declare. (regcache_invalidate): Delete declaration. * corelow.c (get_core_registers): Adjust. * tracepoint.c (tfile_fetch_registers): Adjust. * trad-frame.c (REG_VALUE): Rename to ... (TF_REG_VALUE): ... this. (REG_UNKNOWN): Rename to ... (TF_REG_UNKNOWN): ... this. (trad_frame_set_value, trad_frame_set_unknown): Adjust. * mi/mi-main.c (register_changed_p): Adjust.
Diffstat (limited to 'gdb/regcache.c')
-rw-r--r--gdb/regcache.c89
1 files changed, 48 insertions, 41 deletions
diff --git a/gdb/regcache.c b/gdb/regcache.c
index c9c973e..53e0c59 100644
--- a/gdb/regcache.c
+++ b/gdb/regcache.c
@@ -53,7 +53,7 @@ struct regcache_descr
cache. */
int nr_raw_registers;
long sizeof_raw_registers;
- long sizeof_raw_register_valid_p;
+ long sizeof_raw_register_status;
/* The cooked register space. Each cooked register in the range
[0..NR_RAW_REGISTERS) is direct-mapped onto the corresponding raw
@@ -63,7 +63,7 @@ struct regcache_descr
gdbarch_pseudo_register_read and gdbarch_pseudo_register_write. */
int nr_cooked_registers;
long sizeof_cooked_registers;
- long sizeof_cooked_register_valid_p;
+ long sizeof_cooked_register_status;
/* Offset and size (in 8 bit bytes), of reach register in the
register cache. All registers (including those in the range
@@ -92,9 +92,8 @@ init_regcache_descr (struct gdbarch *gdbarch)
either mapped onto raw-registers or memory. */
descr->nr_cooked_registers = gdbarch_num_regs (gdbarch)
+ gdbarch_num_pseudo_regs (gdbarch);
- descr->sizeof_cooked_register_valid_p = gdbarch_num_regs (gdbarch)
- + gdbarch_num_pseudo_regs
- (gdbarch);
+ descr->sizeof_cooked_register_status
+ = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
/* Fill in a table of register types. */
descr->register_type
@@ -106,7 +105,7 @@ init_regcache_descr (struct gdbarch *gdbarch)
/* Construct a strictly RAW register cache. Don't allow pseudo's
into the register cache. */
descr->nr_raw_registers = gdbarch_num_regs (gdbarch);
- descr->sizeof_raw_register_valid_p = gdbarch_num_regs (gdbarch);
+ descr->sizeof_raw_register_status = gdbarch_num_regs (gdbarch);
/* Lay out the register cache.
@@ -194,11 +193,8 @@ struct regcache
full [0 .. gdbarch_num_regs + gdbarch_num_pseudo_regs) while a read/write
register cache can only hold [0 .. gdbarch_num_regs). */
gdb_byte *registers;
- /* Register cache status:
- register_valid_p[REG] == 0 if REG value is not in the cache
- > 0 if REG value is in the cache
- < 0 if REG value is permanently unavailable */
- signed char *register_valid_p;
+ /* Register cache status. */
+ signed char *register_status;
/* Is this a read-only cache? A read-only cache is used for saving
the target's register state (e.g, across an inferior function
call or just before forcing a function return). A read-only
@@ -227,15 +223,15 @@ regcache_xmalloc_1 (struct gdbarch *gdbarch, struct address_space *aspace,
{
regcache->registers
= XCALLOC (descr->sizeof_cooked_registers, gdb_byte);
- regcache->register_valid_p
- = XCALLOC (descr->sizeof_cooked_register_valid_p, gdb_byte);
+ regcache->register_status
+ = XCALLOC (descr->sizeof_cooked_register_status, gdb_byte);
}
else
{
regcache->registers
= XCALLOC (descr->sizeof_raw_registers, gdb_byte);
- regcache->register_valid_p
- = XCALLOC (descr->sizeof_raw_register_valid_p, gdb_byte);
+ regcache->register_status
+ = XCALLOC (descr->sizeof_raw_register_status, gdb_byte);
}
regcache->aspace = aspace;
regcache->ptid = minus_one_ptid;
@@ -254,7 +250,7 @@ regcache_xfree (struct regcache *regcache)
if (regcache == NULL)
return;
xfree (regcache->registers);
- xfree (regcache->register_valid_p);
+ xfree (regcache->register_status);
xfree (regcache);
}
@@ -306,8 +302,8 @@ regcache_save (struct regcache *dst, regcache_cooked_read_ftype *cooked_read,
gdb_assert (dst->readonly_p);
/* Clear the dest. */
memset (dst->registers, 0, dst->descr->sizeof_cooked_registers);
- memset (dst->register_valid_p, 0,
- dst->descr->sizeof_cooked_register_valid_p);
+ memset (dst->register_status, 0,
+ dst->descr->sizeof_cooked_register_status);
/* Copy over any registers (identified by their membership in the
save_reggroup) and mark them as valid. The full [0 .. gdbarch_num_regs +
gdbarch_num_pseudo_regs) range is checked since some architectures need
@@ -322,7 +318,7 @@ regcache_save (struct regcache *dst, regcache_cooked_read_ftype *cooked_read,
{
memcpy (register_buffer (dst, regnum), buf,
register_size (gdbarch, regnum));
- dst->register_valid_p[regnum] = 1;
+ dst->register_status[regnum] = REG_VALID;
}
}
}
@@ -361,7 +357,7 @@ do_cooked_read (void *src, int regnum, gdb_byte *buf)
{
struct regcache *regcache = src;
- if (!regcache->register_valid_p[regnum] && regcache->readonly_p)
+ if (regcache->register_status[regnum] == REG_UNKNOWN && regcache->readonly_p)
/* Don't even think about fetching a register from a read-only
cache when the register isn't yet valid. There isn't a target
from which the register value can be fetched. */
@@ -393,14 +389,15 @@ regcache_cpy_no_passthrough (struct regcache *dst, struct regcache *src)
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 completely invalid. */
+ move of data into a thread's regcache. Doing this would be silly
+ - it would mean that regcache->register_status would be
+ completely invalid. */
gdb_assert (dst->readonly_p && src->readonly_p);
memcpy (dst->registers, src->registers,
dst->descr->sizeof_cooked_registers);
- memcpy (dst->register_valid_p, src->register_valid_p,
- dst->descr->sizeof_cooked_register_valid_p);
+ memcpy (dst->register_status, src->register_status,
+ dst->descr->sizeof_cooked_register_status);
}
struct regcache *
@@ -414,7 +411,7 @@ regcache_dup (struct regcache *src)
}
int
-regcache_valid_p (const struct regcache *regcache, int regnum)
+regcache_register_status (const struct regcache *regcache, int regnum)
{
gdb_assert (regcache != NULL);
gdb_assert (regnum >= 0);
@@ -423,7 +420,7 @@ regcache_valid_p (const struct regcache *regcache, int regnum)
else
gdb_assert (regnum < regcache->descr->nr_raw_registers);
- return regcache->register_valid_p[regnum];
+ return regcache->register_status[regnum];
}
void
@@ -433,7 +430,7 @@ regcache_invalidate (struct regcache *regcache, int regnum)
gdb_assert (regnum >= 0);
gdb_assert (!regcache->readonly_p);
gdb_assert (regnum < regcache->descr->nr_raw_registers);
- regcache->register_valid_p[regnum] = 0;
+ regcache->register_status[regnum] = REG_UNKNOWN;
}
@@ -586,7 +583,7 @@ regcache_raw_read (struct regcache *regcache, int regnum, gdb_byte *buf)
On the bright side, at least there is a regcache object. */
if (!regcache->readonly_p)
{
- if (!regcache_valid_p (regcache, regnum))
+ if (regcache_register_status (regcache, regnum) == REG_UNKNOWN)
{
struct cleanup *old_chain = save_inferior_ptid ();
@@ -601,7 +598,7 @@ regcache_raw_read (struct regcache *regcache, int regnum, gdb_byte *buf)
that a register is in one of the possible states: valid,
undefined, unknown. The last of which isn't yet
possible. */
- gdb_assert (regcache_valid_p (regcache, regnum));
+ gdb_assert (regcache_register_status (regcache, regnum) == REG_VALID);
#endif
}
/* Copy the value directly into the register cache. */
@@ -674,8 +671,8 @@ regcache_cooked_read (struct regcache *regcache, int regnum, gdb_byte *buf)
regcache_raw_read (regcache, regnum, buf);
else if (regcache->readonly_p
&& regnum < regcache->descr->nr_cooked_registers
- && regcache->register_valid_p[regnum])
- /* Read-only register cache, perhaps the cooked value was cached? */
+ && regcache->register_status[regnum] == REG_VALID)
+ /* Read-only register cache, and the cooked value was cached. */
memcpy (buf, register_buffer (regcache, regnum),
regcache->descr->sizeof_register[regnum]);
else
@@ -758,7 +755,7 @@ regcache_raw_write (struct regcache *regcache, int regnum,
/* 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)
+ if (regcache_register_status (regcache, regnum) == REG_VALID
&& (memcmp (register_buffer (regcache, regnum), buf,
regcache->descr->sizeof_register[regnum]) == 0))
return;
@@ -769,7 +766,7 @@ regcache_raw_write (struct regcache *regcache, int regnum,
target_prepare_to_store (regcache);
memcpy (register_buffer (regcache, regnum), buf,
regcache->descr->sizeof_register[regnum]);
- regcache->register_valid_p[regnum] = 1;
+ regcache->register_status[regnum] = REG_VALID;
target_store_registers (regcache, regnum);
do_cleanups (old_chain);
@@ -893,12 +890,18 @@ regcache_raw_supply (struct regcache *regcache, int regnum, const void *buf)
size = regcache->descr->sizeof_register[regnum];
if (buf)
- memcpy (regbuf, buf, size);
+ {
+ memcpy (regbuf, buf, size);
+ regcache->register_status[regnum] = REG_VALID;
+ }
else
- memset (regbuf, 0, size);
-
- /* Mark the register as cached. */
- regcache->register_valid_p[regnum] = 1;
+ {
+ /* This memset not strictly necessary, but better than garbage
+ in case the register value manages to escape somewhere (due
+ to a bug, no less). */
+ memset (regbuf, 0, size);
+ regcache->register_status[regnum] = REG_UNAVAILABLE;
+ }
}
/* Collect register REGNUM from REGCACHE and store its contents in BUF. */
@@ -1022,8 +1025,8 @@ regcache_dump (struct regcache *regcache, struct ui_file *file,
regcache->descr->nr_cooked_registers);
fprintf_unfiltered (file, "sizeof_raw_registers %ld\n",
regcache->descr->sizeof_raw_registers);
- fprintf_unfiltered (file, "sizeof_raw_register_valid_p %ld\n",
- regcache->descr->sizeof_raw_register_valid_p);
+ fprintf_unfiltered (file, "sizeof_raw_register_status %ld\n",
+ regcache->descr->sizeof_raw_register_status);
fprintf_unfiltered (file, "gdbarch_num_regs %d\n",
gdbarch_num_regs (gdbarch));
fprintf_unfiltered (file, "gdbarch_num_pseudo_regs %d\n",
@@ -1134,8 +1137,10 @@ regcache_dump (struct regcache *regcache, struct ui_file *file,
fprintf_unfiltered (file, "Raw value");
else if (regnum >= regcache->descr->nr_raw_registers)
fprintf_unfiltered (file, "<cooked>");
- else if (!regcache_valid_p (regcache, regnum))
+ else if (regcache_register_status (regcache, regnum) == REG_UNKNOWN)
fprintf_unfiltered (file, "<invalid>");
+ else if (regcache_register_status (regcache, regnum) == REG_UNAVAILABLE)
+ fprintf_unfiltered (file, "<unavailable>");
else
{
regcache_raw_read (regcache, regnum, buf);
@@ -1153,6 +1158,8 @@ regcache_dump (struct regcache *regcache, struct ui_file *file,
fprintf_unfiltered (file, "Cooked value");
else
{
+ /* FIXME: no way for cooked reads to signal unavailable
+ yet. */
regcache_cooked_read (regcache, regnum, buf);
fprintf_unfiltered (file, "0x");
dump_endian_bytes (file,