aboutsummaryrefslogtreecommitdiff
path: root/gdb/i386-tdep.c
diff options
context:
space:
mode:
authorAndrew Cagney <cagney@redhat.com>2002-08-13 14:32:28 +0000
committerAndrew Cagney <cagney@redhat.com>2002-08-13 14:32:28 +0000
commit28fc67409494a8a33cb1a7826a896a054ca71dd3 (patch)
tree55b6296ba26a63f1c11e8d4d04e0131247553985 /gdb/i386-tdep.c
parenta378f4192681bdbeb5f7aa12ae3c6e9505cd14a7 (diff)
downloadgdb-28fc67409494a8a33cb1a7826a896a054ca71dd3.zip
gdb-28fc67409494a8a33cb1a7826a896a054ca71dd3.tar.gz
gdb-28fc67409494a8a33cb1a7826a896a054ca71dd3.tar.bz2
2002-08-13 Andrew Cagney <cagney@redhat.com>
* i386-tdep.c (i386_register_name): Handle mmx registers. (mmx_regnum_p): New function. (i386_mmx_names): New array. (mmx_num_regs): New variable. (i386_pseudo_register_read): New function. (i386_pseudo_register_write): New function. (mmx_regnum_to_fp_regnum): New function. Code from Fernando Nasser. * regcache.c (regcache_raw_read_unsigned): New function. (regcache_raw_read_signed): New function. * regcache.h (regcache_raw_read_unsigned): Declare. (regcache_raw_read_signed): Declare.
Diffstat (limited to 'gdb/i386-tdep.c')
-rw-r--r--gdb/i386-tdep.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index ad19691..7a8d2de 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -56,6 +56,23 @@ static char *i386_register_names[] =
"mxcsr"
};
+/* MMX registers. */
+
+static char *i386_mmx_names[] =
+{
+ "mm0", "mm1", "mm2", "mm3",
+ "mm4", "mm5", "mm6", "mm7"
+};
+static const int mmx_num_regs = (sizeof (i386_mmx_names)
+ / sizeof (i386_mmx_names[0]));
+#define MM0_REGNUM (NUM_REGS)
+
+static int
+mmx_regnum_p (int reg)
+{
+ return (reg >= MM0_REGNUM && reg < MM0_REGNUM + mmx_num_regs);
+}
+
/* Return the name of register REG. */
const char *
@@ -63,6 +80,8 @@ i386_register_name (int reg)
{
if (reg < 0)
return NULL;
+ if (mmx_regnum_p (reg))
+ return i386_mmx_names[reg - MM0_REGNUM];
if (reg >= sizeof (i386_register_names) / sizeof (*i386_register_names))
return NULL;
@@ -1090,9 +1109,64 @@ i386_register_virtual_type (int regnum)
if (IS_SSE_REGNUM (regnum))
return builtin_type_vec128i;
+ if (mmx_regnum_p (regnum))
+ return builtin_type_vec64i;
+
return builtin_type_int;
}
+/* Map a cooked register onto a raw register or memory. For the i386,
+ the MMX registers need to be mapped onto floating point registers. */
+
+static int
+mmx_regnum_to_fp_regnum (struct regcache *regcache, int regnum)
+{
+ int mmxi;
+ ULONGEST fstat;
+ int tos;
+ int fpi;
+ mmxi = regnum - MM0_REGNUM;
+ regcache_raw_read_unsigned (regcache, FSTAT_REGNUM, &fstat);
+ tos = (fstat >> 11) & 0x7;
+ fpi = (mmxi + tos) % 8;
+ return (FP0_REGNUM + fpi);
+}
+
+static void
+i386_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, void *buf)
+{
+ if (mmx_regnum_p (regnum))
+ {
+ char *mmx_buf = alloca (MAX_REGISTER_RAW_SIZE);
+ int fpnum = mmx_regnum_to_fp_regnum (regcache, regnum);
+ regcache_raw_read (regcache, fpnum, mmx_buf);
+ /* Extract (always little endian). */
+ memcpy (buf, mmx_buf, REGISTER_RAW_SIZE (regnum));
+ }
+ else
+ regcache_raw_read (regcache, regnum, buf);
+}
+
+static void
+i386_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, const void *buf)
+{
+ if (mmx_regnum_p (regnum))
+ {
+ char *mmx_buf = alloca (MAX_REGISTER_RAW_SIZE);
+ int fpnum = mmx_regnum_to_fp_regnum (regcache, regnum);
+ /* Read ... */
+ regcache_raw_read (regcache, fpnum, mmx_buf);
+ /* ... Modify ... (always little endian). */
+ memcpy (mmx_buf, buf, REGISTER_RAW_SIZE (regnum));
+ /* ... Write. */
+ regcache_raw_write (regcache, fpnum, mmx_buf);
+ }
+ else
+ regcache_raw_write (regcache, regnum, buf);
+}
+
/* Return true iff register REGNUM's virtual format is different from
its raw format. Note that this definition assumes that the host
supports IEEE 32-bit floats, since it doesn't say that SSE
@@ -1486,6 +1560,11 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_frame_num_args (gdbarch, i386_frame_num_args);
set_gdbarch_pc_in_sigtramp (gdbarch, i386_pc_in_sigtramp);
+ /* Wire in the MMX registers. */
+ set_gdbarch_num_pseudo_regs (gdbarch, mmx_num_regs);
+ set_gdbarch_pseudo_register_read (gdbarch, i386_pseudo_register_read);
+ set_gdbarch_pseudo_register_write (gdbarch, i386_pseudo_register_write);
+
/* Hook in ABI-specific overrides, if they have been registered. */
gdbarch_init_osabi (info, gdbarch, osabi);