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: releng/11.0/usr.bin/truss/i386-freebsd.c 295056 2016-01-30 01:00:54Z 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 <stdio.h> 44#include <sysdecode.h> 45 46#include "truss.h" 47 48static int 49i386_fetch_args(struct trussinfo *trussinfo, u_int narg) 50{ 51 struct ptrace_io_desc iorequest; 52 struct reg regs; 53 struct current_syscall *cs; 54 lwpid_t tid; 55 unsigned int parm_offset; 56 57 tid = trussinfo->curthread->tid; 58 cs = &trussinfo->curthread->cs; 59 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 60 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 61 return (-1); 62 } 63 parm_offset = regs.r_esp + sizeof(int); 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 the first argument. 72 */ 73 switch (regs.r_eax) { 74 case SYS_syscall: 75 parm_offset += sizeof(int); 76 break; 77 case SYS___syscall: 78 parm_offset += sizeof(quad_t); 79 break; 80 } 81 82 iorequest.piod_op = PIOD_READ_D; 83 iorequest.piod_offs = (void *)parm_offset; 84 iorequest.piod_addr = cs->args; 85 iorequest.piod_len = narg * sizeof(unsigned long); 86 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0); 87 if (iorequest.piod_len == 0) 88 return (-1); 89 90 return (0); 91} 92 93static int 94i386_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp) 95{ 96 struct reg regs; 97 lwpid_t tid; 98 99 tid = trussinfo->curthread->tid; 100 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 101 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 102 return (-1); 103 } 104 105 retval[0] = regs.r_eax; 106 retval[1] = regs.r_edx; 107 *errorp = !!(regs.r_eflags & PSL_C); 108 return (0); 109} 110 111static struct procabi i386_freebsd = { 112 "FreeBSD ELF32", 113 SYSDECODE_ABI_FREEBSD, 114 i386_fetch_args, 115 i386_fetch_retval 116}; 117 118PROCABI(i386_freebsd); 119 120static struct procabi i386_freebsd_aout = { 121 "FreeBSD a.out", 122 SYSDECODE_ABI_FREEBSD, 123 i386_fetch_args, 124 i386_fetch_retval 125}; 126 127PROCABI(i386_freebsd_aout); 128 129