Support for passing/returning parameters

Support for passing/returning parameters

This patch implements passing/returning of parameters for Morello.  It is
implemented based on the Morello AAPCS64 document and supports both the hybrid
AAPCS64 and Pure-Cap AAPCS64-CAP ABI's.

gdb/ChangeLog

2021-02-26  Luis Machado  <luis.machado@arm.com>

	* aarch64-tdep.c (struct stack_item_t) <arg_value): New field.
	(set_register_tag, pass_in_c, pass_in_c_or_stack,
	pass_in_c_x_or_stack, type_fields_overlap_capabilities,
	convert_pointer_to_capability,
	morello_write_memory_with_capabilities,
	morello_push_dummy_call, morello_extract_return_value,
	morello_return_in_memory, morello_store_return_value,
	morello_return_value): New functions.
	(pass_in_x, pass_in_v, pass_on_stack, pass_in_x_or_stack,
	pass_in_v_vfp_candidate): Update.
	(aarch64_return_value): New argument value.
	(aarch64_gdbarch_init): Conditionally set both gdbarch_push_dummy_call
	and gdbarch_return_value.
	* arch/aarch64.h (MORELLO_MEMORY_TAG_GRANULE_SIZE): New constant.
	* dwarf2/read.c (handle_struct_member_die): Record whether the
	composite type contains capabilities.
	* gdbarch.sh (return_value): New argument value.
	* gdbarch.c: Regenerate.
	* gdbarch.h: Regenerate.
	* gdbtypes.c (recursive_dump_type): Dump extra information.
	(append_composite_type_field_raw): Set whether the composite type
	constains capabilities.
	* gdbtypes.h (struct main_type) <m_flag_contains_capability>: New field.
	<contains_capability>: New member function.
	<set_contains_capability>: New member function.

	* alpha-tdep.c: Update return_value hook prototype.
	* amd64-tdep.c: Update return_value hook prototype.
	* amd64-windows-tdep.c: Update return_value hook prototype.
	* arc-tdep.c: Update return_value hook prototype.
	* arm-tdep.c: Update return_value hook prototype.
	* avr-tdep.c: Update return_value hook prototype.
	* bfin-tdep.c: Update return_value hook prototype.
	* bpf-tdep.c: Update return_value hook prototype.
	* cris-tdep.c: Update return_value hook prototype.
	* csky-tdep.c: Update return_value hook prototype.
	* elfread.c: Update return_value hook prototype.
	* frv-tdep.c: Update return_value hook prototype.
	* ft32-tdep.c: Update return_value hook prototype.
	* h8300-tdep.c: Update return_value hook prototype.
	* hppa-tdep.c: Update return_value hook prototype.
	* i386-tdep.c: Update return_value hook prototype.
	* ia64-tdep.c: Update return_value hook prototype.
	* infcall.c: Update return_value hook prototype.
	* infcmd.c: Update return_value hook prototype.
	* lm32-tdep.c: Update return_value hook prototype.
	* m32c-tdep.c: Update return_value hook prototype.
	* m32r-tdep.c: Update return_value hook prototype.
	* m68hc11-tdep.c: Update return_value hook prototype.
	* m68k-tdep.c: Update return_value hook prototype.
	* mep-tdep.c: Update return_value hook prototype.
	* microblaze-tdep.c: Update return_value hook prototype.
	* mips-tdep.c: Update return_value hook prototype.
	* mn10300-tdep.c: Update return_value hook prototype.
	* moxie-tdep.c: Update return_value hook prototype.
	* msp430-tdep.c: Update return_value hook prototype.
	* nds32-tdep.c: Update return_value hook prototype.
	* nios2-tdep.c: Update return_value hook prototype.
	* or1k-tdep.c: Update return_value hook prototype.
	* ppc-fbsd-tdep.c: Update return_value hook prototype.
	* ppc-linux-tdep.c: Update return_value hook prototype.
	* ppc-netbsd-tdep.c: Update return_value hook prototype.
	* ppc-sysv-tdep.c: Update return_value hook prototype.
	* riscv-tdep.c: Update return_value hook prototype.
	* rl78-tdep.c: Update return_value hook prototype.
	* rs6000-aix-tdep.c: Update return_value hook prototype.
	* rs6000-lynx178-tdep.c: Update return_value hook prototype.
	* rx-tdep.c: Update return_value hook prototype.
	* s12z-tdep.c: Update return_value hook prototype.
	* s390-tdep.c: Update return_value hook prototype.
	* score-tdep.c: Update return_value hook prototype.
	* sh-tdep.c: Update return_value hook prototype.
	* sparc-tdep.c: Update return_value hook prototype.
	* sparc64-tdep.c: Update return_value hook prototype.
	* stack.c: Update return_value hook prototype.
	* tic6x-tdep.c: Update return_value hook prototype.
	* tilegx-tdep.c: Update return_value hook prototype.
	* v850-tdep.c: Update return_value hook prototype.
	* valprint.c: Update return_value hook prototype.
	* value.c: Update return_value hook prototype.
	* vax-tdep.c: Update return_value hook prototype.
	* xstormy16-tdep.c: Update return_value hook prototype.
	* xtensa-tdep.c: Update return_value hook prototype.