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-rw-r--r--gdb/mips-tdep.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c
index f6c568a..e02202c 100644
--- a/gdb/mips-tdep.c
+++ b/gdb/mips-tdep.c
@@ -54,6 +54,7 @@
#include "frame-base.h"
#include "trad-frame.h"
#include "infcall.h"
+#include "floatformat.h"
static const struct objfile_data *mips_pdr_data;
@@ -149,6 +150,32 @@ struct gdbarch_tdep
const char **mips_processor_reg_names;
};
+static int
+n32n64_floatformat_always_valid (const struct floatformat *fmt,
+ const char *from)
+{
+ return 1;
+}
+
+/* FIXME: brobecker/2004-08-08: Long Double values are 128 bit long.
+ They are implemented as a pair of 64bit doubles where the high
+ part holds the result of the operation rounded to double, and
+ the low double holds the difference between the exact result and
+ the rounded result. So "high" + "low" contains the result with
+ added precision. Unfortunately, the floatformat structure used
+ by GDB is not powerful enough to describe this format. As a temporary
+ measure, we define a 128bit floatformat that only uses the high part.
+ We lose a bit of precision but that's probably the best we can do
+ for now with the current infrastructure. */
+
+static const struct floatformat floatformat_n32n64_long_double_big =
+{
+ floatformat_big, 128, 0, 1, 11, 1023, 2047, 12, 52,
+ floatformat_intbit_no,
+ "floatformat_ieee_double_big",
+ n32n64_floatformat_always_valid
+};
+
const struct mips_regnum *
mips_regnum (struct gdbarch *gdbarch)
{
@@ -6323,6 +6350,9 @@ mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_long_bit (gdbarch, 32);
set_gdbarch_ptr_bit (gdbarch, 32);
set_gdbarch_long_long_bit (gdbarch, 64);
+ set_gdbarch_long_double_bit (gdbarch, 128);
+ set_gdbarch_long_double_format (gdbarch,
+ &floatformat_n32n64_long_double_big);
break;
case MIPS_ABI_N64:
set_gdbarch_push_dummy_call (gdbarch, mips_n32n64_push_dummy_call);
@@ -6333,6 +6363,9 @@ mips_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_long_bit (gdbarch, 64);
set_gdbarch_ptr_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
+ set_gdbarch_long_double_bit (gdbarch, 128);
+ set_gdbarch_long_double_format (gdbarch,
+ &floatformat_n32n64_long_double_big);
break;
default:
internal_error (__FILE__, __LINE__, "unknown ABI in switch");