amd64-freebsd.c revision 294849
158551Skris/* 258551Skris * Copyright 1997 Sean Eric Fagan 358551Skris * 458551Skris * Redistribution and use in source and binary forms, with or without 558551Skris * modification, are permitted provided that the following conditions 658551Skris * are met: 7228060Sbapt * 1. Redistributions of source code must retain the above copyright 858551Skris * notice, this list of conditions and the following disclaimer. 958551Skris * 2. Redistributions in binary form must reproduce the above copyright 1058551Skris * notice, this list of conditions and the following disclaimer in the 1158551Skris * documentation and/or other materials provided with the distribution. 1258551Skris * 3. All advertising materials mentioning features or use of this software 13228060Sbapt * must display the following acknowledgement: 14228060Sbapt * This product includes software developed by Sean Eric Fagan 1558551Skris * 4. Neither the name of the author may be used to endorse or promote 16228060Sbapt * products derived from this software without specific prior written 17228060Sbapt * permission. 1858551Skris * 19228060Sbapt * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20228060Sbapt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2158551Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22228060Sbapt * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23228060Sbapt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2458551Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25228060Sbapt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26228060Sbapt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2758551Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2858551Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2958551Skris * SUCH DAMAGE. 3058551Skris */ 31228060Sbapt 32228060Sbapt#include <sys/cdefs.h> 3358551Skris__FBSDID("$FreeBSD: head/usr.bin/truss/amd64-freebsd.c 294849 2016-01-26 19:07:09Z jhb $"); 34228060Sbapt 35228060Sbapt/* FreeBSD/amd64-specific system call handling. */ 36228060Sbapt 37228060Sbapt#include <sys/ptrace.h> 38228060Sbapt#include <sys/syscall.h> 39228060Sbapt 4067064Sobrien#include <machine/reg.h> 4167064Sobrien#include <machine/psl.h> 4267064Sobrien 4358551Skris#include <stdio.h> 4458551Skris#include <sysdecode.h> 45 46#include "truss.h" 47 48static int 49amd64_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 u_int i, reg; 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 64 /* 65 * FreeBSD has two special kinds of system call redirections -- 66 * SYS_syscall, and SYS___syscall. The former is the old syscall() 67 * routine, basically; the latter is for quad-aligned arguments. 68 * 69 * The system call argument count and code from ptrace() already 70 * account for these, but we need to skip over %rax if it contains 71 * either of these values. 72 */ 73 reg = 0; 74 switch (regs.r_rax) { 75 case SYS_syscall: 76 case SYS___syscall: 77 reg++; 78 break; 79 } 80 81 for (i = 0; i < narg && reg < 6; i++, reg++) { 82 switch (reg) { 83 case 0: cs->args[i] = regs.r_rdi; break; 84 case 1: cs->args[i] = regs.r_rsi; break; 85 case 2: cs->args[i] = regs.r_rdx; break; 86 case 3: cs->args[i] = regs.r_rcx; break; 87 case 4: cs->args[i] = regs.r_r8; break; 88 case 5: cs->args[i] = regs.r_r9; break; 89 } 90 } 91 if (narg > i) { 92 iorequest.piod_op = PIOD_READ_D; 93 iorequest.piod_offs = (void *)(regs.r_rsp + sizeof(register_t)); 94 iorequest.piod_addr = &cs->args[i]; 95 iorequest.piod_len = (narg - i) * sizeof(register_t); 96 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0); 97 if (iorequest.piod_len == 0) 98 return (-1); 99 } 100 101 return (0); 102} 103 104static int 105amd64_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp) 106{ 107 struct reg regs; 108 lwpid_t tid; 109 110 tid = trussinfo->curthread->tid; 111 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 112 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 113 return (-1); 114 } 115 116 retval[0] = regs.r_rax; 117 retval[1] = regs.r_rdx; 118 *errorp = !!(regs.r_rflags & PSL_C); 119 return (0); 120} 121 122static struct procabi amd64_freebsd = { 123 "FreeBSD ELF64", 124 FREEBSD, 125 amd64_fetch_args, 126 amd64_fetch_retval 127}; 128 129PROCABI(amd64_freebsd); 130