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https://github.com/darlinghq/darling-gdb.git
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* arm-tdep.c (enum arm_vfp_cprc_base_type,
arm_vfp_cprc_unit_length, arm_vfp_cprc_reg_char, arm_vfp_cprc_sub_candidate, arm_vfp_call_candidate, arm_vfp_abi_for_function): New. (arm_push_dummy_call): Handle VFP ABI. (arm_extract_return_value, arm_store_return_value): Handle ARM_FLOAT_VFP case. (arm_return_value): Handle VFP ABI. (arm_gdbarch_init): Default fp_model based on Tag_ABI_VFP_args for EABI binaries.
This commit is contained in:
Daniel Jacobowitz
parent
3612b1927e
commit
90445bd31f
@ -1,3 +1,16 @@
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2009-07-28 Joseph Myers <joseph@codesourcery.com>
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* arm-tdep.c (enum arm_vfp_cprc_base_type,
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arm_vfp_cprc_unit_length, arm_vfp_cprc_reg_char,
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arm_vfp_cprc_sub_candidate, arm_vfp_call_candidate,
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arm_vfp_abi_for_function): New.
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(arm_push_dummy_call): Handle VFP ABI.
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(arm_extract_return_value, arm_store_return_value): Handle
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ARM_FLOAT_VFP case.
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(arm_return_value): Handle VFP ABI.
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(arm_gdbarch_init): Default fp_model based on Tag_ABI_VFP_args for
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EABI binaries.
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2009-07-28 Daniel Jacobowitz <dan@codesourcery.com>
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* arch-utils.c (displaced_step_at_entry_point): Do not call
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358
gdb/arm-tdep.c
358
gdb/arm-tdep.c
@ -1373,8 +1373,222 @@ arm_type_align (struct type *t)
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}
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}
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/* We currently only support passing parameters in integer registers. This
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conforms with GCC's default model. Several other variants exist and
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/* Possible base types for a candidate for passing and returning in
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VFP registers. */
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enum arm_vfp_cprc_base_type
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{
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VFP_CPRC_UNKNOWN,
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VFP_CPRC_SINGLE,
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VFP_CPRC_DOUBLE,
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VFP_CPRC_VEC64,
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VFP_CPRC_VEC128
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};
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/* The length of one element of base type B. */
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static unsigned
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arm_vfp_cprc_unit_length (enum arm_vfp_cprc_base_type b)
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{
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switch (b)
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{
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case VFP_CPRC_SINGLE:
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return 4;
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case VFP_CPRC_DOUBLE:
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return 8;
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case VFP_CPRC_VEC64:
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return 8;
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case VFP_CPRC_VEC128:
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return 16;
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default:
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internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."),
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(int) b);
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}
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}
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/* The character ('s', 'd' or 'q') for the type of VFP register used
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for passing base type B. */
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static int
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arm_vfp_cprc_reg_char (enum arm_vfp_cprc_base_type b)
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{
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switch (b)
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{
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case VFP_CPRC_SINGLE:
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return 's';
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case VFP_CPRC_DOUBLE:
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return 'd';
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case VFP_CPRC_VEC64:
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return 'd';
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case VFP_CPRC_VEC128:
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return 'q';
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default:
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internal_error (__FILE__, __LINE__, _("Invalid VFP CPRC type: %d."),
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(int) b);
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}
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}
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/* Determine whether T may be part of a candidate for passing and
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returning in VFP registers, ignoring the limit on the total number
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of components. If *BASE_TYPE is VFP_CPRC_UNKNOWN, set it to the
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classification of the first valid component found; if it is not
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VFP_CPRC_UNKNOWN, all components must have the same classification
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as *BASE_TYPE. If it is found that T contains a type not permitted
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for passing and returning in VFP registers, a type differently
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classified from *BASE_TYPE, or two types differently classified
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from each other, return -1, otherwise return the total number of
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base-type elements found (possibly 0 in an empty structure or
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array). Vectors and complex types are not currently supported,
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matching the generic AAPCS support. */
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static int
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arm_vfp_cprc_sub_candidate (struct type *t,
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enum arm_vfp_cprc_base_type *base_type)
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{
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t = check_typedef (t);
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switch (TYPE_CODE (t))
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{
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case TYPE_CODE_FLT:
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switch (TYPE_LENGTH (t))
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{
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case 4:
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if (*base_type == VFP_CPRC_UNKNOWN)
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*base_type = VFP_CPRC_SINGLE;
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else if (*base_type != VFP_CPRC_SINGLE)
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return -1;
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return 1;
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case 8:
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if (*base_type == VFP_CPRC_UNKNOWN)
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*base_type = VFP_CPRC_DOUBLE;
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else if (*base_type != VFP_CPRC_DOUBLE)
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return -1;
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return 1;
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default:
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return -1;
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}
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break;
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case TYPE_CODE_ARRAY:
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{
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int count;
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unsigned unitlen;
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count = arm_vfp_cprc_sub_candidate (TYPE_TARGET_TYPE (t), base_type);
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if (count == -1)
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return -1;
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if (TYPE_LENGTH (t) == 0)
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{
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gdb_assert (count == 0);
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return 0;
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}
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else if (count == 0)
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return -1;
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unitlen = arm_vfp_cprc_unit_length (*base_type);
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gdb_assert ((TYPE_LENGTH (t) % unitlen) == 0);
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return TYPE_LENGTH (t) / unitlen;
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}
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break;
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case TYPE_CODE_STRUCT:
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{
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int count = 0;
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unsigned unitlen;
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int i;
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for (i = 0; i < TYPE_NFIELDS (t); i++)
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{
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int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i),
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base_type);
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if (sub_count == -1)
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return -1;
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count += sub_count;
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}
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if (TYPE_LENGTH (t) == 0)
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{
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gdb_assert (count == 0);
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return 0;
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}
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else if (count == 0)
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return -1;
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unitlen = arm_vfp_cprc_unit_length (*base_type);
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if (TYPE_LENGTH (t) != unitlen * count)
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return -1;
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return count;
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}
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case TYPE_CODE_UNION:
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{
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int count = 0;
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unsigned unitlen;
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int i;
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for (i = 0; i < TYPE_NFIELDS (t); i++)
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{
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int sub_count = arm_vfp_cprc_sub_candidate (TYPE_FIELD_TYPE (t, i),
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base_type);
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if (sub_count == -1)
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return -1;
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count = (count > sub_count ? count : sub_count);
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}
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if (TYPE_LENGTH (t) == 0)
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{
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gdb_assert (count == 0);
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return 0;
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}
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else if (count == 0)
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return -1;
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unitlen = arm_vfp_cprc_unit_length (*base_type);
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if (TYPE_LENGTH (t) != unitlen * count)
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return -1;
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return count;
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}
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default:
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break;
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}
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return -1;
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}
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/* Determine whether T is a VFP co-processor register candidate (CPRC)
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if passed to or returned from a non-variadic function with the VFP
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ABI in effect. Return 1 if it is, 0 otherwise. If it is, set
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*BASE_TYPE to the base type for T and *COUNT to the number of
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elements of that base type before returning. */
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static int
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arm_vfp_call_candidate (struct type *t, enum arm_vfp_cprc_base_type *base_type,
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int *count)
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{
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enum arm_vfp_cprc_base_type b = VFP_CPRC_UNKNOWN;
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int c = arm_vfp_cprc_sub_candidate (t, &b);
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if (c <= 0 || c > 4)
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return 0;
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*base_type = b;
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*count = c;
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return 1;
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}
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/* Return 1 if the VFP ABI should be used for passing arguments to and
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returning values from a function of type FUNC_TYPE, 0
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otherwise. */
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static int
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arm_vfp_abi_for_function (struct gdbarch *gdbarch, struct type *func_type)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Variadic functions always use the base ABI. Assume that functions
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without debug info are not variadic. */
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if (func_type && TYPE_VARARGS (check_typedef (func_type)))
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return 0;
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/* The VFP ABI is only supported as a variant of AAPCS. */
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if (tdep->arm_abi != ARM_ABI_AAPCS)
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return 0;
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return gdbarch_tdep (gdbarch)->fp_model == ARM_FLOAT_VFP;
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}
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/* We currently only support passing parameters in integer registers, which
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conforms with GCC's default model, and VFP argument passing following
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the VFP variant of AAPCS. Several other variants exist and
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we should probably support some of them based on the selected ABI. */
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static CORE_ADDR
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@ -1388,6 +1602,16 @@ arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
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int argreg;
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int nstack;
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struct stack_item *si = NULL;
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int use_vfp_abi;
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struct type *ftype;
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unsigned vfp_regs_free = (1 << 16) - 1;
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/* Determine the type of this function and whether the VFP ABI
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applies. */
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ftype = check_typedef (value_type (function));
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if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
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ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
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use_vfp_abi = arm_vfp_abi_for_function (gdbarch, ftype);
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/* Set the return address. For the ARM, the return breakpoint is
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always at BP_ADDR. */
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@ -1422,6 +1646,9 @@ arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
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enum type_code typecode;
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bfd_byte *val;
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int align;
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enum arm_vfp_cprc_base_type vfp_base_type;
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int vfp_base_count;
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int may_use_core_reg = 1;
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arg_type = check_typedef (value_type (args[argnum]));
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len = TYPE_LENGTH (arg_type);
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@ -1445,6 +1672,59 @@ arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
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align = INT_REGISTER_SIZE * 2;
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}
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if (use_vfp_abi
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&& arm_vfp_call_candidate (arg_type, &vfp_base_type,
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&vfp_base_count))
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{
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int regno;
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int unit_length;
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int shift;
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unsigned mask;
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/* Because this is a CPRC it cannot go in a core register or
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cause a core register to be skipped for alignment.
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Either it goes in VFP registers and the rest of this loop
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iteration is skipped for this argument, or it goes on the
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stack (and the stack alignment code is correct for this
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case). */
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may_use_core_reg = 0;
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unit_length = arm_vfp_cprc_unit_length (vfp_base_type);
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shift = unit_length / 4;
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mask = (1 << (shift * vfp_base_count)) - 1;
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for (regno = 0; regno < 16; regno += shift)
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if (((vfp_regs_free >> regno) & mask) == mask)
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break;
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if (regno < 16)
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{
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int reg_char;
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int reg_scaled;
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int i;
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vfp_regs_free &= ~(mask << regno);
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reg_scaled = regno / shift;
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reg_char = arm_vfp_cprc_reg_char (vfp_base_type);
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for (i = 0; i < vfp_base_count; i++)
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{
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char name_buf[4];
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int regnum;
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sprintf (name_buf, "%c%d", reg_char, reg_scaled + i);
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regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
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strlen (name_buf));
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regcache_cooked_write (regcache, regnum,
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val + i * unit_length);
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}
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continue;
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}
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else
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{
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/* This CPRC could not go in VFP registers, so all VFP
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registers are now marked as used. */
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vfp_regs_free = 0;
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}
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}
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/* Push stack padding for dowubleword alignment. */
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if (nstack & (align - 1))
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{
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@ -1453,7 +1733,8 @@ arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
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}
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/* Doubleword aligned quantities must go in even register pairs. */
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if (argreg <= ARM_LAST_ARG_REGNUM
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if (may_use_core_reg
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&& argreg <= ARM_LAST_ARG_REGNUM
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&& align > INT_REGISTER_SIZE
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&& argreg & 1)
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argreg++;
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@ -1481,7 +1762,7 @@ arm_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
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{
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int partial_len = len < INT_REGISTER_SIZE ? len : INT_REGISTER_SIZE;
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if (argreg <= ARM_LAST_ARG_REGNUM)
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if (may_use_core_reg && argreg <= ARM_LAST_ARG_REGNUM)
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{
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/* The argument is being passed in a general purpose
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register. */
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@ -2315,6 +2596,9 @@ arm_extract_return_value (struct type *type, struct regcache *regs,
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case ARM_FLOAT_SOFT_FPA:
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case ARM_FLOAT_SOFT_VFP:
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/* ARM_FLOAT_VFP can arise if this is a variadic function so
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not using the VFP ABI code. */
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case ARM_FLOAT_VFP:
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regcache_cooked_read (regs, ARM_A1_REGNUM, valbuf);
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if (TYPE_LENGTH (type) > 4)
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regcache_cooked_read (regs, ARM_A1_REGNUM + 1,
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@ -2501,6 +2785,9 @@ arm_store_return_value (struct type *type, struct regcache *regs,
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case ARM_FLOAT_SOFT_FPA:
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case ARM_FLOAT_SOFT_VFP:
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/* ARM_FLOAT_VFP can arise if this is a variadic function so
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not using the VFP ABI code. */
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case ARM_FLOAT_VFP:
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regcache_cooked_write (regs, ARM_A1_REGNUM, valbuf);
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if (TYPE_LENGTH (type) > 4)
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regcache_cooked_write (regs, ARM_A1_REGNUM + 1,
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@ -2576,6 +2863,31 @@ arm_return_value (struct gdbarch *gdbarch, struct type *func_type,
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gdb_byte *readbuf, const gdb_byte *writebuf)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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enum arm_vfp_cprc_base_type vfp_base_type;
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int vfp_base_count;
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if (arm_vfp_abi_for_function (gdbarch, func_type)
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&& arm_vfp_call_candidate (valtype, &vfp_base_type, &vfp_base_count))
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{
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int reg_char = arm_vfp_cprc_reg_char (vfp_base_type);
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int unit_length = arm_vfp_cprc_unit_length (vfp_base_type);
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int i;
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for (i = 0; i < vfp_base_count; i++)
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{
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char name_buf[4];
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int regnum;
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sprintf (name_buf, "%c%d", reg_char, i);
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regnum = user_reg_map_name_to_regnum (gdbarch, name_buf,
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strlen (name_buf));
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if (writebuf)
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regcache_cooked_write (regcache, regnum,
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writebuf + i * unit_length);
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if (readbuf)
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regcache_cooked_read (regcache, regnum,
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readbuf + i * unit_length);
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}
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return RETURN_VALUE_REGISTER_CONVENTION;
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}
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if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT
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|| TYPE_CODE (valtype) == TYPE_CODE_UNION
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@ -3151,10 +3463,46 @@ arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
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case EF_ARM_EABI_VER4:
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case EF_ARM_EABI_VER5:
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arm_abi = ARM_ABI_AAPCS;
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/* EABI binaries default to VFP float ordering. */
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/* EABI binaries default to VFP float ordering.
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They may also contain build attributes that can
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be used to identify if the VFP argument-passing
|
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ABI is in use. */
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if (fp_model == ARM_FLOAT_AUTO)
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{
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#ifdef HAVE_ELF
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switch (bfd_elf_get_obj_attr_int (info.abfd,
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OBJ_ATTR_PROC,
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Tag_ABI_VFP_args))
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{
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case 0:
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/* "The user intended FP parameter/result
|
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passing to conform to AAPCS, base
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variant". */
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fp_model = ARM_FLOAT_SOFT_VFP;
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break;
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case 1:
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/* "The user intended FP parameter/result
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passing to conform to AAPCS, VFP
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variant". */
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fp_model = ARM_FLOAT_VFP;
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break;
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case 2:
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/* "The user intended FP parameter/result
|
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passing to conform to tool chain-specific
|
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conventions" - we don't know any such
|
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conventions, so leave it as "auto". */
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break;
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default:
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/* Attribute value not mentioned in the
|
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October 2008 ABI, so leave it as
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"auto". */
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break;
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}
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#else
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fp_model = ARM_FLOAT_SOFT_VFP;
|
||||
#endif
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
/* Leave it as "auto". */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user