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Support _Complex in hard-VFP abi 

Hi,
When we pass "-mfloat-abi=hard" flag in the GDB testing, we see the
following fails,

FAIL: gdb.base/callfuncs.exp: p t_float_complex_values(fc1, fc2)
FAIL: gdb.base/callfuncs.exp: p t_float_complex_many_args(fc1, fc2, fc3, fc4, fc1, fc2, fc3, fc4, fc1, fc2, fc3, fc4, fc1, fc2, fc3, fc4)
FAIL: gdb.base/callfuncs.exp: p t_double_complex_values(dc1, dc2)
FAIL: gdb.base/callfuncs.exp: p t_double_complex_many_args(dc1, dc2, dc3, dc4, dc1, dc2, dc3, dc4, dc1, dc2, dc3, dc4, dc1, dc2, dc3, dc4)
FAIL: gdb.base/callfuncs.exp: p t_long_double_complex_values(ldc1, ldc2)
FAIL: gdb.base/callfuncs.exp: p t_long_double_complex_many_args(ldc1, ldc2, ldc3, ldc4, ldc1, ldc2, ldc3, ldc4, ldc1, ldc2, ldc3, ldc4, ldc1, ldc2, ldc3, ldc4)
FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns float _Complex
FAIL: gdb.base/callfuncs.exp: call inferior func with struct - returns double _Complex

The hard-VFP ABI was supported by GDB overal, done by this patch
https://sourceware.org/ml/gdb-patches/2009-07/msg00686.html but
"vectors and complex types are not currently supported", mentioned in
the patch.  As a result, these tests fail.

This patch is to support _Complex types in hard-VFP abi.  As specified
in "7.1.1, Procedure Call Standard for the ARM Arch", the layout of
_Complex types is a struct, which is identical to the layout on amd64,
so I copy Mark's comments to amd64 support.

Regression tested on arm-none-eabi target.  OK to apply?

gdb:

2014-08-19  Yao Qi  <yao@codesourcery.com>

	* arm-tdep.c (arm_vfp_cprc_sub_candidate): Handle _Complex
	types.
This commit is contained in:
Yao Qi 2014-08-11 19:02:58 +08:00
parent 2974be626b
commit 817e0957a5
2 changed files with 37 additions and 2 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2014-08-19 Yao Qi <yao@codesourcery.com>
* arm-tdep.c (arm_vfp_cprc_sub_candidate): Handle _Complex
types.
2014-08-19 Alan Modra <amodra@gmail.com>
* acinclude.m4 (GDB_AC_CHECK_BFD): Don't add -ldl.

34
gdb/arm-tdep.c
View File

@ -3562,8 +3562,8 @@ arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b)
classified from *BASE_TYPE, or two types differently classified
from each other, return -1, otherwise return the total number of
base-type elements found (possibly 0 in an empty structure or
array). Vectors and complex types are not currently supported,
matching the generic AAPCS support. */
array). Vector types are not currently supported, matching the
generic AAPCS support. */
static int
arm_vfp_cprc_sub_candidate (struct type *t,
@ -3594,6 +3594,36 @@ arm_vfp_cprc_sub_candidate (struct type *t,
}
break;
case TYPE_CODE_COMPLEX:
/* Arguments of complex T where T is one of the types float or
double get treated as if they are implemented as:
struct complexT
{
T real;
T imag;
}; */
switch (TYPE_LENGTH (t))
{
case 8:
if (*base_type == VFP_CPRC_UNKNOWN)
*base_type = VFP_CPRC_SINGLE;
else if (*base_type != VFP_CPRC_SINGLE)
return -1;
return 2;
case 16:
if (*base_type == VFP_CPRC_UNKNOWN)
*base_type = VFP_CPRC_DOUBLE;
else if (*base_type != VFP_CPRC_DOUBLE)
return -1;
return 2;
default:
return -1;
}
break;
case TYPE_CODE_ARRAY:
{
int count;