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2000-07-28 Elena Zannoni <ezannoni@kwikemart.cygnus.com>

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* sh-tdep.c (sh_gdbarch_init): For sh4 initialize
 	register_convert_to_raw, register_convert_to_virtual,
 	register_convertible.
	(sh_sh4_register_convertible): New function.
	(sh_sh4_register_convert_to_virtual): New function.
	(sh_sh4_register_convert_to_raw): New function.
	Include floatformat.h.
This commit is contained in:
Elena Zannoni 2000-07-28 15:16:16 +00:00
parent 1ce322678c
commit fb40974593
2 changed files with 79 additions and 0 deletions
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10
gdb/ChangeLog
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@ -1,3 +1,13 @@
2000-07-28 Elena Zannoni <ezannoni@kwikemart.cygnus.com>
* sh-tdep.c (sh_gdbarch_init): For sh4 initialize
register_convert_to_raw, register_convert_to_virtual,
register_convertible.
(sh_sh4_register_convertible): New function.
(sh_sh4_register_convert_to_virtual): New function.
(sh_sh4_register_convert_to_raw): New function.
Include floatformat.h.
Thu Jul 27 14:06:27 2000 Andrew Cagney <cagney@b1.cygnus.com> Thu Jul 27 14:06:27 2000 Andrew Cagney <cagney@b1.cygnus.com>
From 2000-06-25 Stephane Carrez <Stephane.Carrez@worldnet.fr>: From 2000-06-25 Stephane Carrez <Stephane.Carrez@worldnet.fr>:

69
gdb/sh-tdep.c
View file

@ -37,6 +37,7 @@
#include "inferior.h" /* for BEFORE_TEXT_END etc. */ #include "inferior.h" /* for BEFORE_TEXT_END etc. */
#include "gdb_string.h" #include "gdb_string.h"
#include "arch-utils.h" #include "arch-utils.h"
#include "floatformat.h"
#undef XMALLOC #undef XMALLOC
#define XMALLOC(TYPE) ((TYPE*) xmalloc (sizeof (TYPE))) #define XMALLOC(TYPE) ((TYPE*) xmalloc (sizeof (TYPE)))
@ -1530,6 +1531,71 @@ sh_default_register_virtual_type (reg_nr)
return builtin_type_int; return builtin_type_int;
} }
/* On the sh4, the DRi pseudo registers are problematic if the target
is little endian. When the user writes one of those registers, for
instance with 'ser var $dr0=1', we want the double to be stored
like this:
fr0 = 0x00 0x00 0x00 0x00 0x00 0xf0 0x3f
fr1 = 0x00 0x00 0x00 0x00 0x00 0x00 0x00
This corresponds to little endian byte order & big endian word
order. However if we let gdb write the register w/o conversion, it
will write fr0 and fr1 this way:
fr0 = 0x00 0x00 0x00 0x00 0x00 0x00 0x00
fr1 = 0x00 0x00 0x00 0x00 0x00 0xf0 0x3f
because it will consider fr0 and fr1 as a single LE stretch of memory.
To achieve what we want we must force gdb to store things in
floatformat_ieee_double_littlebyte_bigword (which is defined in
include/floatformat.h and libiberty/floatformat.c.
In case the target is big endian, there is no problem, the
raw bytes will look like:
fr0 = 0x3f 0xf0 0x00 0x00 0x00 0x00 0x00
fr1 = 0x00 0x00 0x00 0x00 0x00 0x00 0x00
The other pseudo registers (the FVs) also don't pose a problem
because they are stored as 4 individual FP elements. */
int
sh_sh4_register_convertible (int nr)
{
if (TARGET_BYTE_ORDER == LITTLE_ENDIAN)
return (gdbarch_tdep (current_gdbarch)->DR0_REGNUM <= nr
&& nr <= gdbarch_tdep (current_gdbarch)->DR14_REGNUM);
else
return 0;
}
void
sh_sh4_register_convert_to_virtual (int regnum, struct type *type,
char *from, char *to)
{
if (regnum >= gdbarch_tdep (current_gdbarch)->DR0_REGNUM
&& regnum <= gdbarch_tdep (current_gdbarch)->DR14_REGNUM)
{
DOUBLEST val;
floatformat_to_doublest (&floatformat_ieee_double_littlebyte_bigword, from, &val);
store_floating(to, TYPE_LENGTH(type), val);
}
else
error("sh_register_convert_to_virtual called with non DR register number");
}
void
sh_sh4_register_convert_to_raw (struct type *type, int regnum,
char *from, char *to)
{
if (regnum >= gdbarch_tdep (current_gdbarch)->DR0_REGNUM
&& regnum <= gdbarch_tdep (current_gdbarch)->DR14_REGNUM)
{
DOUBLEST val = extract_floating (from, TYPE_LENGTH(type));
floatformat_from_doublest (&floatformat_ieee_double_littlebyte_bigword, &val, to);
}
else
error("sh_register_convert_to_raw called with non DR register number");
}
void void
sh_fetch_pseudo_register (int reg_nr) sh_fetch_pseudo_register (int reg_nr)
{ {
@ -1953,6 +2019,9 @@ sh_gdbarch_init (info, arches)
set_gdbarch_num_pseudo_regs (gdbarch, 12); set_gdbarch_num_pseudo_regs (gdbarch, 12);
set_gdbarch_max_register_raw_size (gdbarch, 4 * 4); set_gdbarch_max_register_raw_size (gdbarch, 4 * 4);
set_gdbarch_max_register_virtual_size (gdbarch, 4 * 4); set_gdbarch_max_register_virtual_size (gdbarch, 4 * 4);
set_gdbarch_register_convert_to_raw (gdbarch, sh_sh4_register_convert_to_raw);
set_gdbarch_register_convert_to_virtual (gdbarch, sh_sh4_register_convert_to_virtual);
set_gdbarch_register_convertible (gdbarch, sh_sh4_register_convertible);
tdep->FPUL_REGNUM = 23; tdep->FPUL_REGNUM = 23;
tdep->FPSCR_REGNUM = 24; tdep->FPSCR_REGNUM = 24;
tdep->FP15_REGNUM = 40; tdep->FP15_REGNUM = 40;