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PR 19051: support of inferior call with gnu vector support on ARM

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This patch teaches GDB to support gnu vector in inferior calls.  As a
result, fails in gdb.base/gnu_vector.exp are fixed.  The calling
convention of gnu vector isn't documented in the AAPCS, because it
is the GCC extension.  I checked the gcc/config/arm/arm.c, understand
how GCC pass arguments and return values, and do the same in GDB side.

The patch is tested with both hard float and soft float on arm-linux.

gdb:

2015-11-13  Yao Qi  <yao.qi@linaro.org>

	PR tdep/19051
	* arm-tdep.c (arm_type_align): Return the right alignment
	value for vector.
	(arm_vfp_cprc_sub_candidate): Return true for 64-bit and
	128-bit vector types.
	(arm_return_in_memory): Handel vector type.
This commit is contained in:
Yao Qi 2015-11-13 15:11:58 +00:00
parent b13c8ab2b9
commit c4312b1985
2 changed files with 63 additions and 14 deletions
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9
gdb/ChangeLog
View File

@ -1,3 +1,12 @@
2015-11-13 Yao Qi <yao.qi@linaro.org>
PR tdep/19051
* arm-tdep.c (arm_type_align): Return the right alignment
value for vector.
(arm_vfp_cprc_sub_candidate): Return true for 64-bit and
128-bit vector types.
(arm_return_in_memory): Handel vector type.
2015-11-13 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (arm_return_in_memory): Rewrite it.

68
gdb/arm-tdep.c
View File

@ -3446,8 +3446,18 @@ arm_type_align (struct type *t)
return TYPE_LENGTH (t);
case TYPE_CODE_ARRAY:
if (TYPE_VECTOR (t))
{
/* Use the natural alignment for vector types (the same for
scalar type), but the maximum alignment is 64-bit. */
if (TYPE_LENGTH (t) > 8)
return 8;
else
return TYPE_LENGTH (t);
}
else
return arm_type_align (TYPE_TARGET_TYPE (t));
case TYPE_CODE_COMPLEX:
/* TODO: What about vector types? */
return arm_type_align (TYPE_TARGET_TYPE (t));
case TYPE_CODE_STRUCT:
@ -3594,21 +3604,44 @@ arm_vfp_cprc_sub_candidate (struct type *t,
case TYPE_CODE_ARRAY:
{
int count;
unsigned unitlen;
count = arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t), base_type);
if (count == -1)
return -1;
if (TYPE_LENGTH (t) == 0)
if (TYPE_VECTOR (t))
{
gdb_assert (count == 0);
return 0;
/* A 64-bit or 128-bit containerized vector type are VFP
CPRCs. */
switch (TYPE_LENGTH (t))
{
case 8:
if (*base_type == VFP_CPRC_UNKNOWN)
*base_type = VFP_CPRC_VEC64;
return 1;
case 16:
if (*base_type == VFP_CPRC_UNKNOWN)
*base_type = VFP_CPRC_VEC128;
return 1;
default:
return -1;
}
}
else
{
int count;
unsigned unitlen;
count = arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t),
base_type);
if (count == -1)
return -1;
if (TYPE_LENGTH (t) == 0)
{
gdb_assert (count == 0);
return 0;
}
else if (count == 0)
return -1;
unitlen = arm_vfp_cprc_unit_length (*base_type);
gdb_assert ((TYPE_LENGTH (t) % unitlen) == 0);
return TYPE_LENGTH (t) / unitlen;
}
else if (count == 0)
return -1;
unitlen = arm_vfp_cprc_unit_length (*base_type);
gdb_assert ((TYPE_LENGTH (t) % unitlen) == 0);
return TYPE_LENGTH (t) / unitlen;
}
break;
@ -9000,6 +9033,13 @@ arm_return_in_memory (struct gdbarch *gdbarch, struct type *type)
&& TYPE_CODE_ARRAY != code && TYPE_CODE_COMPLEX != code)
return 0;
if (TYPE_CODE_ARRAY == code && TYPE_VECTOR (type))
{
/* Vector values should be returned using ARM registers if they
are not over 16 bytes. */
return (TYPE_LENGTH (type) > 16);
}
if (gdbarch_tdep (gdbarch)->arm_abi != ARM_ABI_APCS)
{
/* The AAPCS says all aggregates not larger than a word are returned