(struct gdbarch_tdep): Add struct_return.
* m68k-tdep.c (m68k_push_dummy_call): Non-scalars bigger than 4
bytes are padded to the right, not to the left. Pass struct value
address in register %a1, not on stack.
(m68k_use_struct_convention): New function.
(m68k_gdbarch_init): Set use_struct_convention. Initialize
struct_return in tdep to pcc_struct_return.
* m68klinux-tdep.c (m68k_linux_init_abi): Set struct_return to
reg_struct_return.
dependencies.
* config/m68k/tm-linux.h (DEPRECATED_EXTRACT_RETURN_VALUE): Define
as m68k_linux_extract_return_value.
(DEPRECATED_STORE_RETURN_VALUE): Define as
m68k_linux_store_return_value.
(DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS): Define as
m68k_linux_extract_struct_value_address.
* m68klinux-tdep.c (m68k_linux_sigtramp_saved_pc): Use
get_next_frame, get_frame_base, get_frame_pc.
(m68k_linux_frame_saved_pc): Use get_frame_base.
(m68k_linux_extract_return_value): New function.
(m68k_linux_store_return_value): New function.
(m68k_linux_extract_struct_value_address): New function.
* config/m68k/tm-m68k.h: Declare m68k_get_longjmp_target.
(altos_skip_prologue, delta68_frame_saved_pc, isi_frame_num_args)
(delta68_frame_num_args, news_frame_num_args, m68k_skip_prologue)
(m68k_frame_init_saved_regs, m68k_saved_pc_after_call): Use
read_memory_unsigned_integer instead of read_memory_integer when
dealing with addresses and instruction opcodes.
* m68klinux-tdep.c (m68k_linux_sigtramp_saved_pc)
(m68k_linux_frame_saved_pc): Likewise.
