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[AArch64] Support gnu vector in inferior call 

As defined in AArch64 AAPCS, short vectors are passed through V
registers, and its maximum alignment is 16-byte.  This patch is
to reflect these rules in GDB.  This patch fixes some fails in
gdb.base/gnu_vector.exp.

gdb:

2015-11-27  Yao Qi  <yao.qi@linaro.org>

	* aarch64-tdep.c (aarch64_type_align): For vector type, return
	its length, but with the maximum of 16 bytes.
	(is_hfa): Return zero for vector type.
	(aarch64_push_dummy_call): Handle short vectors.
	(aarch64_extract_return_value): Likewise.
	(aarch64_store_return_value): Likewise.
This commit is contained in:
Yao Qi 2015-11-27 14:50:30 +00:00
parent dfcb77a8d7
commit 238f2452e6
2 changed files with 48 additions and 0 deletions
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9
gdb/ChangeLog
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@ -1,3 +1,12 @@
2015-11-27 Yao Qi <yao.qi@linaro.org>
* aarch64-tdep.c (aarch64_type_align): For vector type, return
its length, but with the maximum of 16 bytes.
(is_hfa): Return zero for vector type.
(aarch64_push_dummy_call): Handle short vectors.
(aarch64_extract_return_value): Likewise.
(aarch64_store_return_value): Likewise.
2015-11-26 Daniel Colascione <dancol@dancol.org>
2015-11-26 Simon Marchi <simon.marchi@ericsson.com>

39
gdb/aarch64-tdep.c
View File

@ -894,6 +894,17 @@ aarch64_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 128-bit. */
if (TYPE_LENGTH (t) > 16)
return 16;
else
return TYPE_LENGTH (t);
}
else
return aarch64_type_align (TYPE_TARGET_TYPE (t));
case TYPE_CODE_COMPLEX:
return aarch64_type_align (TYPE_TARGET_TYPE (t));
@ -921,6 +932,10 @@ is_hfa (struct type *ty)
case TYPE_CODE_ARRAY:
{
struct type *target_ty = TYPE_TARGET_TYPE (ty);
if (TYPE_VECTOR (ty))
return 0;
if (TYPE_CODE (target_ty) == TYPE_CODE_FLT && TYPE_LENGTH (ty) <= 4)
return 1;
break;
@ -1318,6 +1333,12 @@ aarch64_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
pass_on_stack (&info, arg_type, arg);
}
}
else if (TYPE_CODE (arg_type) == TYPE_CODE_ARRAY
&& TYPE_VECTOR (arg_type) && (len == 16 || len == 8))
{
/* Short vector types are passed in V registers. */
pass_in_v_or_stack (gdbarch, regcache, &info, arg_type, arg);
}
else if (len > 16)
{
/* PCS B.7 Aggregates larger than 16 bytes are passed by
@ -1643,6 +1664,15 @@ aarch64_extract_return_value (struct type *type, struct regcache *regs,
valbuf += len;
}
}
else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type)
&& (TYPE_LENGTH (type) == 16 || TYPE_LENGTH (type) == 8))
{
/* Short vector is returned in V register. */
gdb_byte buf[V_REGISTER_SIZE];
regcache_cooked_read (regs, AARCH64_V0_REGNUM, buf);
memcpy (valbuf, buf, TYPE_LENGTH (type));
}
else
{
/* For a structure or union the behaviour is as if the value had
@ -1772,6 +1802,15 @@ aarch64_store_return_value (struct type *type, struct regcache *regs,
valbuf += len;
}
}
else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type)
&& (TYPE_LENGTH (type) == 8 || TYPE_LENGTH (type) == 16))
{
/* Short vector. */
gdb_byte buf[V_REGISTER_SIZE];
memcpy (buf, valbuf, TYPE_LENGTH (type));
regcache_cooked_write (regs, AARCH64_V0_REGNUM, buf);
}
else
{
/* For a structure or union the behaviour is as if the value had