1/* 2 * Copyright (c) 2015 The FreeBSD Foundation 3 * 4 * Portions of this software were developed by Konstantin Belousov 5 * under sponsorship from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/11/usr.bin/truss/aarch64-freebsd.c 312084 2017-01-13 21:30:18Z jhb $"); 31 32/* FreeBSD/arm64-specific system call handling. */ 33 34#include <sys/ptrace.h> 35#include <sys/syscall.h> 36 37#include <machine/reg.h> 38#include <machine/armreg.h> 39#include <machine/ucontext.h> 40 41#include <stdbool.h> 42#include <stdio.h> 43#include <sysdecode.h> 44 45#include "truss.h" 46 47static int 48aarch64_fetch_args(struct trussinfo *trussinfo, u_int narg) 49{ 50 struct reg regs; 51 struct current_syscall *cs; 52 lwpid_t tid; 53 u_int i, reg, syscall_num; 54 55 tid = trussinfo->curthread->tid; 56 cs = &trussinfo->curthread->cs; 57 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 58 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 59 return (-1); 60 } 61 62 /* 63 * FreeBSD has two special kinds of system call redirections -- 64 * SYS_syscall, and SYS___syscall. The former is the old syscall() 65 * routine, basically; the latter is for quad-aligned arguments. 66 * 67 * The system call argument count and code from ptrace() already 68 * account for these, but we need to skip over the first argument. 69 */ 70 syscall_num = regs.x[8]; 71 if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) { 72 reg = 1; 73 syscall_num = regs.x[0]; 74 } else { 75 reg = 0; 76 } 77 78 for (i = 0; i < narg && reg < 8; i++, reg++) 79 cs->args[i] = regs.x[reg]; 80 return (0); 81} 82 83static int 84aarch64_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp) 85{ 86 struct reg regs; 87 lwpid_t tid; 88 89 tid = trussinfo->curthread->tid; 90 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 91 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 92 return (-1); 93 } 94 95 retval[0] = regs.x[0]; 96 retval[1] = regs.x[1]; 97 *errorp = !!(regs.spsr & PSR_C); 98 return (0); 99} 100 101static struct procabi aarch64_freebsd = { 102 "FreeBSD ELF64", 103 SYSDECODE_ABI_FREEBSD, 104 aarch64_fetch_args, 105 aarch64_fetch_retval, 106 STAILQ_HEAD_INITIALIZER(aarch64_freebsd.extra_syscalls), 107 { NULL } 108}; 109 110PROCABI(aarch64_freebsd); 111