gas/
* config/tc-aarch64.c (enum aarch64_abi_type): New enumeration tag.
(AARCH64_ABI_LP64, AARCH64_ABI_ILP32): New enumerators.
(aarch64_abi): New variable.
(ilp32_p): Change to be a macro.
(aarch64_opts): Remove the support for option -milp32 and -mlp64.
(struct aarch64_option_abi_value_table): New struct.
(aarch64_abis): New table.
(aarch64_parse_abi): New function.
(aarch64_long_opts): Add entry for -mabi=.
* doc/as.texinfo (Target AArch64 options): Document -mabi.
* doc/c-aarch64.texi: Likewise.
gas/testsuite/
* gas/aarch64/ilp32-basic.d (#as): Update to use -mabi=ilp32