1/* 2 * Copyright 1997 Sean Eric Fagan 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. All advertising materials mentioning features or use of this software 13 * must display the following acknowledgement: 14 * This product includes software developed by Sean Eric Fagan 15 * 4. Neither the name of the author may be used to endorse or promote 16 * products derived from this software without specific prior written 17 * permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD$"); 34 35/* FreeBSD/amd64-specific system call handling. */ 36 37#include <sys/ptrace.h> 38#include <sys/syscall.h> 39 40#include <machine/reg.h> 41#include <machine/psl.h> 42 43#include <stdio.h> 44 45#include "truss.h" 46 47#include "syscalls.h" 48 49static int 50amd64_fetch_args(struct trussinfo *trussinfo, u_int narg) 51{ 52 struct ptrace_io_desc iorequest; 53 struct reg regs; 54 struct current_syscall *cs; 55 lwpid_t tid; 56 u_int i, reg; 57 58 tid = trussinfo->curthread->tid; 59 cs = &trussinfo->curthread->cs; 60 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 61 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 62 return (-1); 63 } 64 65 /* 66 * FreeBSD has two special kinds of system call redirections -- 67 * SYS_syscall, and SYS___syscall. The former is the old syscall() 68 * routine, basically; the latter is for quad-aligned arguments. 69 * 70 * The system call argument count and code from ptrace() already 71 * account for these, but we need to skip over %rax if it contains 72 * either of these values. 73 */ 74 reg = 0; 75 switch (regs.r_rax) { 76 case SYS_syscall: 77 case SYS___syscall: 78 reg++; 79 break; 80 } 81 82 for (i = 0; i < narg && reg < 6; i++, reg++) { 83 switch (reg) { 84 case 0: cs->args[i] = regs.r_rdi; break; 85 case 1: cs->args[i] = regs.r_rsi; break; 86 case 2: cs->args[i] = regs.r_rdx; break; 87 case 3: cs->args[i] = regs.r_rcx; break; 88 case 4: cs->args[i] = regs.r_r8; break; 89 case 5: cs->args[i] = regs.r_r9; break; 90 } 91 } 92 if (narg > i) { 93 iorequest.piod_op = PIOD_READ_D; 94 iorequest.piod_offs = (void *)(regs.r_rsp + sizeof(register_t)); 95 iorequest.piod_addr = &cs->args[i]; 96 iorequest.piod_len = (narg - i) * sizeof(register_t); 97 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0); 98 if (iorequest.piod_len == 0) 99 return (-1); 100 } 101 102 return (0); 103} 104 105static int 106amd64_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp) 107{ 108 struct reg regs; 109 lwpid_t tid; 110 111 tid = trussinfo->curthread->tid; 112 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 113 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 114 return (-1); 115 } 116 117 retval[0] = regs.r_rax; 118 retval[1] = regs.r_rdx; 119 *errorp = !!(regs.r_rflags & PSL_C); 120 return (0); 121} 122 123static struct procabi amd64_fbsd = { 124 "FreeBSD ELF64", 125 syscallnames, 126 nitems(syscallnames), 127 amd64_fetch_args, 128 amd64_fetch_retval 129}; 130 131PROCABI(amd64_fbsd); 132