1 /* 2 * ARM AArch64 specific CPU for bsd-user 3 * 4 * Copyright (c) 2015 Stacey D. Son <sson at Freebsd> 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #ifndef BSD_USER_AARCH64_TARGET_SYSCALL_H 21 #define BSD_USER_AARCH64_TARGET_SYSCALL_H 22 23 /* 24 * The aarch64 registers are named: 25 * 26 * x0 through x30 - for 64-bit-wide access (same registers) 27 * Register '31' is one of two registers depending on the instruction context: 28 * For instructions dealing with the stack, it is the stack pointer, named rsp 29 * For all other instructions, it is a "zero" register, which returns 0 when 30 * read and discards data when written - named rzr (xzr, wzr) 31 * 32 * Usage during syscall/function call: 33 * r0-r7 are used for arguments and return values 34 * For syscalls, the syscall number is in r8 35 * r9-r15 are for temporary values (may get trampled) 36 * r16-r18 are used for intra-procedure-call and platform values (avoid) 37 * The called routine is expected to preserve r19-r28 38 * r29 and r30 are used as the frame register and link register (avoid) 39 * See the ARM Procedure Call Reference for details. 40 */ 41 struct target_pt_regs { 42 uint64_t regs[31]; 43 uint64_t sp; 44 uint64_t pc; 45 uint64_t pstate; 46 }; 47 48 #define TARGET_HW_MACHINE "arm64" 49 #define TARGET_HW_MACHINE_ARCH "aarch64" 50 51 #endif /* BSD_USER_AARCH64_TARGET_SYSCALL_H */ 52