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: stable/11/usr.bin/truss/i386-freebsd.c 312084 2017-01-13 21:30:18Z jhb $"); 34 35/* FreeBSD/i386-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 <stdbool.h> 44#include <stdio.h> 45#include <sysdecode.h> 46 47#include "truss.h" 48 49static int 50i386_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 unsigned int parm_offset; 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 parm_offset = regs.r_esp + sizeof(int); 65 66 /* 67 * FreeBSD has two special kinds of system call redirections -- 68 * SYS_syscall, and SYS___syscall. The former is the old syscall() 69 * routine, basically; the latter is for quad-aligned arguments. 70 * 71 * The system call argument count and code from ptrace() already 72 * account for these, but we need to skip over the first argument. 73 */ 74 switch (regs.r_eax) { 75 case SYS_syscall: 76 parm_offset += sizeof(int); 77 break; 78 case SYS___syscall: 79 parm_offset += sizeof(quad_t); 80 break; 81 } 82 83 iorequest.piod_op = PIOD_READ_D; 84 iorequest.piod_offs = (void *)parm_offset; 85 iorequest.piod_addr = cs->args; 86 iorequest.piod_len = narg * sizeof(unsigned long); 87 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0); 88 if (iorequest.piod_len == 0) 89 return (-1); 90 91 return (0); 92} 93 94static int 95i386_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp) 96{ 97 struct reg regs; 98 lwpid_t tid; 99 100 tid = trussinfo->curthread->tid; 101 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 102 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 103 return (-1); 104 } 105 106 retval[0] = regs.r_eax; 107 retval[1] = regs.r_edx; 108 *errorp = !!(regs.r_eflags & PSL_C); 109 return (0); 110} 111 112static struct procabi i386_freebsd = { 113 "FreeBSD ELF32", 114 SYSDECODE_ABI_FREEBSD, 115 i386_fetch_args, 116 i386_fetch_retval, 117 STAILQ_HEAD_INITIALIZER(i386_freebsd.extra_syscalls), 118 { NULL } 119}; 120 121PROCABI(i386_freebsd); 122 123static struct procabi i386_freebsd_aout = { 124 "FreeBSD a.out", 125 SYSDECODE_ABI_FREEBSD, 126 i386_fetch_args, 127 i386_fetch_retval, 128 STAILQ_HEAD_INITIALIZER(i386_freebsd_aout.extra_syscalls), 129 { NULL } 130}; 131 132PROCABI(i386_freebsd_aout); 133 134