powerpc64-freebsd.c revision 311999
1/* 2 * Copyright 2006 Peter Grehan <grehan@freebsd.org> 3 * Copyright 2005 Orlando Bassotto <orlando@break.net> 4 * Copyright 1998 Sean Eric Fagan 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD: stable/11/usr.bin/truss/powerpc64-freebsd.c 311999 2017-01-12 22:06:57Z jhb $"); 30 31/* FreeBSD/powerpc64-specific system call handling. */ 32 33#include <sys/ptrace.h> 34#include <sys/syscall.h> 35 36#include <machine/reg.h> 37#include <machine/frame.h> 38 39#include <stdbool.h> 40#include <stdio.h> 41#include <sysdecode.h> 42 43#include "truss.h" 44 45static int 46powerpc64_fetch_args(struct trussinfo *trussinfo, u_int narg) 47{ 48 struct ptrace_io_desc iorequest; 49 struct reg regs; 50 struct current_syscall *cs; 51 lwpid_t tid; 52 u_int i, reg; 53 54 tid = trussinfo->curthread->tid; 55 cs = &trussinfo->curthread->cs; 56 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 57 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 58 return (-1); 59 } 60 61 /* 62 * FreeBSD has two special kinds of system call redirections -- 63 * SYS_syscall, and SYS___syscall. The former is the old syscall() 64 * routine, basically; the latter is for quad-aligned arguments. 65 * 66 * The system call argument count and code from ptrace() already 67 * account for these, but we need to skip over the first argument. 68 */ 69 reg = 0; 70 switch (regs.fixreg[0]) { 71 case SYS_syscall: 72 case SYS___syscall: 73 reg += 1; 74 break; 75 } 76 77 for (i = 0; i < narg && reg < NARGREG; i++, reg++) 78 cs->args[i] = regs.fixreg[FIRSTARG + reg]; 79 if (narg > i) { 80 iorequest.piod_op = PIOD_READ_D; 81 iorequest.piod_offs = (void *)(regs.fixreg[1] + 48); 82 iorequest.piod_addr = &cs->args[i]; 83 iorequest.piod_len = (narg - i) * sizeof(cs->args[0]); 84 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0); 85 if (iorequest.piod_len == 0) 86 return (-1); 87 } 88 89 return (0); 90} 91 92static int 93powerpc64_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp) 94{ 95 struct reg regs; 96 lwpid_t tid; 97 98 tid = trussinfo->curthread->tid; 99 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 100 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 101 return (-1); 102 } 103 104 retval[0] = regs.fixreg[3]; 105 retval[1] = regs.fixreg[4]; 106 *errorp = !!(regs.cr & 0x10000000); 107 return (0); 108} 109 110static struct procabi powerpc64_freebsd = { 111 "FreeBSD ELF64", 112 SYSDECODE_ABI_FREEBSD, 113 powerpc64_fetch_args, 114 powerpc64_fetch_retval 115}; 116 117PROCABI(powerpc64_freebsd); 118