1130394Sdwmalone/* 2204977Simp * Copyright 1997 Sean Eric Fagan 3130394Sdwmalone * 4130394Sdwmalone * Redistribution and use in source and binary forms, with or without 5130394Sdwmalone * modification, are permitted provided that the following conditions 6130394Sdwmalone * are met: 7130394Sdwmalone * 1. Redistributions of source code must retain the above copyright 8130394Sdwmalone * notice, this list of conditions and the following disclaimer. 9130394Sdwmalone * 2. Redistributions in binary form must reproduce the above copyright 10130394Sdwmalone * notice, this list of conditions and the following disclaimer in the 11130394Sdwmalone * documentation and/or other materials provided with the distribution. 12130394Sdwmalone * 3. All advertising materials mentioning features or use of this software 13130394Sdwmalone * must display the following acknowledgement: 14130394Sdwmalone * This product includes software developed by Sean Eric Fagan 15130394Sdwmalone * 4. Neither the name of the author may be used to endorse or promote 16130394Sdwmalone * products derived from this software without specific prior written 17130394Sdwmalone * permission. 18130394Sdwmalone * 19130394Sdwmalone * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20130394Sdwmalone * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21130394Sdwmalone * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22130394Sdwmalone * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23130394Sdwmalone * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24130394Sdwmalone * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25130394Sdwmalone * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26130394Sdwmalone * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27130394Sdwmalone * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28130394Sdwmalone * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29130394Sdwmalone * SUCH DAMAGE. 30130394Sdwmalone */ 31130394Sdwmalone 32288424Sjhb#include <sys/cdefs.h> 33288424Sjhb__FBSDID("$FreeBSD: releng/11.0/usr.bin/truss/amd64-freebsd.c 295056 2016-01-30 01:00:54Z jhb $"); 34130394Sdwmalone 35288424Sjhb/* FreeBSD/amd64-specific system call handling. */ 36130394Sdwmalone 37168569Sdelphij#include <sys/ptrace.h> 38130394Sdwmalone#include <sys/syscall.h> 39130394Sdwmalone 40130394Sdwmalone#include <machine/reg.h> 41130394Sdwmalone#include <machine/psl.h> 42130394Sdwmalone 43130394Sdwmalone#include <stdio.h> 44294849Sjhb#include <sysdecode.h> 45130394Sdwmalone 46130394Sdwmalone#include "truss.h" 47130394Sdwmalone 48288424Sjhbstatic int 49288424Sjhbamd64_fetch_args(struct trussinfo *trussinfo, u_int narg) 50240562Szont{ 51240005Szont struct ptrace_io_desc iorequest; 52240005Szont struct reg regs; 53288424Sjhb struct current_syscall *cs; 54240562Szont lwpid_t tid; 55288424Sjhb u_int i, reg; 56130394Sdwmalone 57240562Szont tid = trussinfo->curthread->tid; 58288424Sjhb cs = &trussinfo->curthread->cs; 59240562Szont if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 60240005Szont fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 61288424Sjhb return (-1); 62240005Szont } 63130394Sdwmalone 64240005Szont /* 65288424Sjhb * FreeBSD has two special kinds of system call redirections -- 66240005Szont * SYS_syscall, and SYS___syscall. The former is the old syscall() 67240005Szont * routine, basically; the latter is for quad-aligned arguments. 68288424Sjhb * 69288424Sjhb * The system call argument count and code from ptrace() already 70288424Sjhb * account for these, but we need to skip over %rax if it contains 71288424Sjhb * either of these values. 72240005Szont */ 73240005Szont reg = 0; 74288424Sjhb switch (regs.r_rax) { 75240005Szont case SYS_syscall: 76240005Szont case SYS___syscall: 77240005Szont reg++; 78240005Szont break; 79240005Szont } 80130394Sdwmalone 81288424Sjhb for (i = 0; i < narg && reg < 6; i++, reg++) { 82240005Szont switch (reg) { 83288424Sjhb case 0: cs->args[i] = regs.r_rdi; break; 84288424Sjhb case 1: cs->args[i] = regs.r_rsi; break; 85288424Sjhb case 2: cs->args[i] = regs.r_rdx; break; 86288424Sjhb case 3: cs->args[i] = regs.r_rcx; break; 87288424Sjhb case 4: cs->args[i] = regs.r_r8; break; 88288424Sjhb case 5: cs->args[i] = regs.r_r9; break; 89240005Szont } 90240005Szont } 91288424Sjhb if (narg > i) { 92240005Szont iorequest.piod_op = PIOD_READ_D; 93240005Szont iorequest.piod_offs = (void *)(regs.r_rsp + sizeof(register_t)); 94288424Sjhb iorequest.piod_addr = &cs->args[i]; 95288424Sjhb iorequest.piod_len = (narg - i) * sizeof(register_t); 96240562Szont ptrace(PT_IO, tid, (caddr_t)&iorequest, 0); 97240005Szont if (iorequest.piod_len == 0) 98288424Sjhb return (-1); 99240005Szont } 100240005Szont 101288424Sjhb return (0); 102130394Sdwmalone} 103130394Sdwmalone 104288424Sjhbstatic int 105288424Sjhbamd64_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp) 106130394Sdwmalone{ 107240005Szont struct reg regs; 108240562Szont lwpid_t tid; 109130394Sdwmalone 110240562Szont tid = trussinfo->curthread->tid; 111240562Szont if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 112240005Szont fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 113240005Szont return (-1); 114240005Szont } 115130394Sdwmalone 116288424Sjhb retval[0] = regs.r_rax; 117288424Sjhb retval[1] = regs.r_rdx; 118288424Sjhb *errorp = !!(regs.r_rflags & PSL_C); 119288424Sjhb return (0); 120288424Sjhb} 121130394Sdwmalone 122289239Sbdrewerystatic struct procabi amd64_freebsd = { 123288424Sjhb "FreeBSD ELF64", 124295056Sjhb SYSDECODE_ABI_FREEBSD, 125288424Sjhb amd64_fetch_args, 126288424Sjhb amd64_fetch_retval 127288424Sjhb}; 128130394Sdwmalone 129289239SbdreweryPROCABI(amd64_freebsd); 130