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* mips-tdep.c (mips_type_needs_double_align): New function. 

(mips_push_arguments): Align o32 structs to even argument
        registers if necessary.
This commit is contained in:
Daniel Jacobowitz 2001-07-12 17:34:33 +00:00
parent e7df821232
commit 49e790b035
2 changed files with 43 additions and 0 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2001-07-12 Daniel Jacobowitz <drow@mvista.com>
* mips-tdep.c (mips_type_needs_double_align): New function.
(mips_push_arguments): Align o32 structs to even argument
registers if necessary.
2001-07-11 Daniel Jacobowitz <drow@mvista.com>
* config/djgpp/fnchange.lst: Add entries for

37
gdb/mips-tdep.c
View File

@ -2126,6 +2126,35 @@ fp_register_arg_p (enum type_code typecode, struct type *arg_type)
&& MIPS_FPU_TYPE != MIPS_FPU_NONE);
}
/* On o32, argument passing in GPRs depends on the alignment of the type being
passed. Return 1 if this type must be aligned to a doubleword boundary. */
static int
mips_type_needs_double_align (struct type *type)
{
enum type_code typecode = TYPE_CODE (type);
if (typecode == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8)
return 1;
else if (typecode == TYPE_CODE_STRUCT)
{
if (TYPE_NFIELDS (type) < 1)
return 0;
return mips_type_needs_double_align (TYPE_FIELD_TYPE (type, 0));
}
else if (typecode == TYPE_CODE_UNION)
{
int i, n;
n = TYPE_NFIELDS (type);
for (i = 0; i < n; i++)
if (mips_type_needs_double_align (TYPE_FIELD_TYPE (type, i)))
return 1;
return 0;
}
return 0;
}
CORE_ADDR
mips_push_arguments (int nargs,
value_ptr *args,
@ -2312,6 +2341,14 @@ mips_push_arguments (int nargs,
compatibility, we will put them in both places. */
int odd_sized_struct = ((len > MIPS_SAVED_REGSIZE) &&
(len % MIPS_SAVED_REGSIZE != 0));
/* Structures should be aligned to eight bytes (even arg registers)
on MIPS_ABI_O32 if their first member has double precision. */
if (gdbarch_tdep (current_gdbarch)->mips_abi == MIPS_ABI_O32
&& mips_type_needs_double_align (arg_type))
{
if ((argreg & 1))
argreg++;
}
/* Note: Floating-point values that didn't fit into an FP
register are only written to memory. */
while (len > 0)