powerpc64-freebsd32.c revision 154047
1154047Sgrehan/* 2154047Sgrehan * Copyright 2006 Peter Grehan <grehan@freebsd.org> 3154047Sgrehan * Copryight 2005 Orlando Bassotto <orlando@break.net> 4154047Sgrehan * Copryight 1998 Sean Eric Fagan 5154047Sgrehan * 6154047Sgrehan * Redistribution and use in source and binary forms, with or without 7154047Sgrehan * modification, are permitted provided that the following conditions 8154047Sgrehan * are met: 9154047Sgrehan * 1. Redistributions of source code must retain the above copyright 10154047Sgrehan * notice, this list of conditions and the following disclaimer. 11154047Sgrehan * 2. Redistributions in binary form must reproduce the above copyright 12154047Sgrehan * notice, this list of conditions and the following disclaimer in the 13154047Sgrehan * documentation and/or other materials provided with the distribution. 14154047Sgrehan * 15154047Sgrehan * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16154047Sgrehan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17154047Sgrehan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18154047Sgrehan * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19154047Sgrehan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20154047Sgrehan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21154047Sgrehan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22154047Sgrehan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23154047Sgrehan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24154047Sgrehan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25154047Sgrehan * SUCH DAMAGE. 26154047Sgrehan */ 27154047Sgrehan 28154047Sgrehan#ifndef lint 29154047Sgrehanstatic const char rcsid[] = 30154047Sgrehan "$FreeBSD: head/usr.bin/truss/powerpc-fbsd.c 154047 2006-01-05 05:57:47Z grehan $"; 31154047Sgrehan#endif /* not lint */ 32154047Sgrehan 33154047Sgrehan/* 34154047Sgrehan * FreeBSD/powerpc-specific system call handling. This is probably the most 35154047Sgrehan * complex part of the entire truss program, although I've got lots of 36154047Sgrehan * it handled relatively cleanly now. The system call names are generated 37154047Sgrehan * automatically, thanks to /usr/src/sys/kern/syscalls.master. The 38154047Sgrehan * names used for the various structures are confusing, I sadly admit. 39154047Sgrehan * 40154047Sgrehan * This file is almost nothing more than a slightly-edited i386-fbsd.c. 41154047Sgrehan */ 42154047Sgrehan 43154047Sgrehan#include <sys/types.h> 44154047Sgrehan#include <sys/ioctl.h> 45154047Sgrehan#include <sys/pioctl.h> 46154047Sgrehan#include <sys/syscall.h> 47154047Sgrehan 48154047Sgrehan#include <machine/reg.h> 49154047Sgrehan#include <machine/frame.h> 50154047Sgrehan 51154047Sgrehan#include <err.h> 52154047Sgrehan#include <errno.h> 53154047Sgrehan#include <fcntl.h> 54154047Sgrehan#include <signal.h> 55154047Sgrehan#include <stdio.h> 56154047Sgrehan#include <stdlib.h> 57154047Sgrehan#include <string.h> 58154047Sgrehan#include <time.h> 59154047Sgrehan#include <unistd.h> 60154047Sgrehan 61154047Sgrehan#include "truss.h" 62154047Sgrehan#include "syscall.h" 63154047Sgrehan#include "extern.h" 64154047Sgrehan 65154047Sgrehanstatic int fd = -1; 66154047Sgrehanstatic int cpid = -1; 67154047Sgrehan 68154047Sgrehan#include "syscalls.h" 69154047Sgrehan 70154047Sgrehanstatic int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]); 71154047Sgrehan 72154047Sgrehan/* 73154047Sgrehan * This is what this particular file uses to keep track of a system call. 74154047Sgrehan * It is probably not quite sufficient -- I can probably use the same 75154047Sgrehan * structure for the various syscall personalities, and I also probably 76154047Sgrehan * need to nest system calls (for signal handlers). 77154047Sgrehan * 78154047Sgrehan * 'struct syscall' describes the system call; it may be NULL, however, 79154047Sgrehan * if we don't know about this particular system call yet. 80154047Sgrehan */ 81154047Sgrehanstatic struct freebsd_syscall { 82154047Sgrehan struct syscall *sc; 83154047Sgrehan const char *name; 84154047Sgrehan int number; 85154047Sgrehan unsigned long *args; 86154047Sgrehan int nargs; /* number of arguments -- *not* number of words! */ 87154047Sgrehan char **s_args; /* the printable arguments */ 88154047Sgrehan} fsc; 89154047Sgrehan 90154047Sgrehan/* Clear up and free parts of the fsc structure. */ 91154047Sgrehanstatic __inline void 92154047Sgrehanclear_fsc(void) { 93154047Sgrehan if (fsc.args) { 94154047Sgrehan free(fsc.args); 95154047Sgrehan } 96154047Sgrehan if (fsc.s_args) { 97154047Sgrehan int i; 98154047Sgrehan for (i = 0; i < fsc.nargs; i++) 99154047Sgrehan if (fsc.s_args[i]) 100154047Sgrehan free(fsc.s_args[i]); 101154047Sgrehan free(fsc.s_args); 102154047Sgrehan } 103154047Sgrehan memset(&fsc, 0, sizeof(fsc)); 104154047Sgrehan} 105154047Sgrehan 106154047Sgrehan/* 107154047Sgrehan * Called when a process has entered a system call. nargs is the 108154047Sgrehan * number of words, not number of arguments (a necessary distinction 109154047Sgrehan * in some cases). Note that if the STOPEVENT() code in powerpc/powerpc/trap.c 110154047Sgrehan * is ever changed these functions need to keep up. 111154047Sgrehan */ 112154047Sgrehan 113154047Sgrehanvoid 114154047Sgrehanpowerpc_syscall_entry(struct trussinfo *trussinfo, int nargs) { 115154047Sgrehan char buf[32]; 116154047Sgrehan struct reg regs; 117154047Sgrehan void *args; 118154047Sgrehan int syscall_num; 119154047Sgrehan int i; 120154047Sgrehan unsigned int regargs; 121154047Sgrehan struct syscall *sc; 122154047Sgrehan 123154047Sgrehan if (fd == -1 || trussinfo->pid != cpid) { 124154047Sgrehan sprintf(buf, "/proc/%d/regs", trussinfo->pid); 125154047Sgrehan fd = open(buf, O_RDWR); 126154047Sgrehan if (fd == -1) { 127154047Sgrehan fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n"); 128154047Sgrehan return; 129154047Sgrehan } 130154047Sgrehan cpid = trussinfo->pid; 131154047Sgrehan } 132154047Sgrehan 133154047Sgrehan clear_fsc(); 134154047Sgrehan lseek(fd, 0L, 0); 135154047Sgrehan if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) { 136154047Sgrehan fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 137154047Sgrehan return; 138154047Sgrehan } 139154047Sgrehan 140154047Sgrehan /* 141154047Sgrehan * FreeBSD has two special kinds of system call redirctions -- 142154047Sgrehan * SYS_syscall, and SYS___syscall. The former is the old syscall() 143154047Sgrehan * routine, basicly; the latter is for quad-aligned arguments. 144154047Sgrehan */ 145154047Sgrehan regargs = NARGREG; 146154047Sgrehan syscall_num = regs.fixreg[0]; 147154047Sgrehan args = ®s.fixreg[3]; 148154047Sgrehan if (syscall_num == SYS_syscall) { 149154047Sgrehan args = ®s.fixreg[4]; 150154047Sgrehan regargs -= 1; 151154047Sgrehan syscall_num = regs.fixreg[3]; 152154047Sgrehan } else if (syscall_num == SYS___syscall) { 153154047Sgrehan args = ®s.fixreg[5]; 154154047Sgrehan regargs -= 2; 155154047Sgrehan syscall_num = regs.fixreg[4]; 156154047Sgrehan } 157154047Sgrehan 158154047Sgrehan fsc.number = syscall_num; 159154047Sgrehan fsc.name = 160154047Sgrehan (syscall_num < 0 || syscall_num > nsyscalls) ? NULL : syscallnames[syscall_num]; 161154047Sgrehan if (!fsc.name) { 162154047Sgrehan fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num); 163154047Sgrehan } 164154047Sgrehan 165154047Sgrehan if (fsc.name && (trussinfo->flags & FOLLOWFORKS) 166154047Sgrehan && ((!strcmp(fsc.name, "fork") 167154047Sgrehan || !strcmp(fsc.name, "rfork") 168154047Sgrehan || !strcmp(fsc.name, "vfork")))) 169154047Sgrehan { 170154047Sgrehan trussinfo->in_fork = 1; 171154047Sgrehan } 172154047Sgrehan 173154047Sgrehan if (nargs == 0) 174154047Sgrehan return; 175154047Sgrehan 176154047Sgrehan fsc.args = malloc((1+nargs) * sizeof(unsigned long)); 177154047Sgrehan 178154047Sgrehan if (nargs > regargs) { 179154047Sgrehan memmove(&fsc.args[0], args, regargs * sizeof(fsc.args[0])); 180154047Sgrehan lseek(Procfd, regs.fixreg[1] + 8, SEEK_SET); 181154047Sgrehan read(Procfd, &fsc.args[regargs], (nargs - regargs) * sizeof(fsc.args[0])); 182154047Sgrehan } else { 183154047Sgrehan memmove(&fsc.args[0], args, nargs * sizeof(fsc.args[0])); 184154047Sgrehan } 185154047Sgrehan 186154047Sgrehan sc = get_syscall(fsc.name); 187154047Sgrehan if (sc) { 188154047Sgrehan fsc.nargs = sc->nargs; 189154047Sgrehan } else { 190154047Sgrehan#if DEBUG 191154047Sgrehan fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n", 192154047Sgrehan fsc.name, nargs); 193154047Sgrehan#endif 194154047Sgrehan fsc.nargs = nargs; 195154047Sgrehan } 196154047Sgrehan 197154047Sgrehan fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*)); 198154047Sgrehan memset(fsc.s_args, 0, fsc.nargs * sizeof(char*)); 199154047Sgrehan fsc.sc = sc; 200154047Sgrehan 201154047Sgrehan /* 202154047Sgrehan * At this point, we set up the system call arguments. 203154047Sgrehan * We ignore any OUT ones, however -- those are arguments that 204154047Sgrehan * are set by the system call, and so are probably meaningless 205154047Sgrehan * now. This doesn't currently support arguments that are 206154047Sgrehan * passed in *and* out, however. 207154047Sgrehan */ 208154047Sgrehan 209154047Sgrehan if (fsc.name) { 210154047Sgrehan 211154047Sgrehan#if DEBUG 212154047Sgrehan fprintf(stderr, "syscall %s(", fsc.name); 213154047Sgrehan#endif 214154047Sgrehan for (i = 0; i < fsc.nargs; i++) { 215154047Sgrehan#if DEBUG 216154047Sgrehan fprintf(stderr, "0x%x%s", 217154047Sgrehan sc 218154047Sgrehan ? fsc.args[sc->args[i].offset] 219154047Sgrehan : fsc.args[i], 220154047Sgrehan i < (fsc.nargs - 1) ? "," : ""); 221154047Sgrehan#endif 222154047Sgrehan if (sc && !(sc->args[i].type & OUT)) { 223154047Sgrehan fsc.s_args[i] = print_arg(Procfd, &sc->args[i], fsc.args, 0, trussinfo); 224154047Sgrehan } 225154047Sgrehan } 226154047Sgrehan#if DEBUG 227154047Sgrehan fprintf(stderr, ")\n"); 228154047Sgrehan#endif 229154047Sgrehan } 230154047Sgrehan 231154047Sgrehan#if DEBUG 232154047Sgrehan fprintf(trussinfo->outfile, "\n"); 233154047Sgrehan#endif 234154047Sgrehan 235154047Sgrehan /* 236154047Sgrehan * Some system calls should be printed out before they are done -- 237154047Sgrehan * execve() and exit(), for example, never return. Possibly change 238154047Sgrehan * this to work for any system call that doesn't have an OUT 239154047Sgrehan * parameter? 240154047Sgrehan */ 241154047Sgrehan 242154047Sgrehan if (fsc.name && (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) { 243154047Sgrehan 244154047Sgrehan /* XXX 245154047Sgrehan * This could be done in a more general 246154047Sgrehan * manner but it still wouldn't be very pretty. 247154047Sgrehan */ 248154047Sgrehan if (!strcmp(fsc.name, "execve")) { 249154047Sgrehan if ((trussinfo->flags & EXECVEARGS) == 0) 250154047Sgrehan if (fsc.s_args[1]) { 251154047Sgrehan free(fsc.s_args[1]); 252154047Sgrehan fsc.s_args[1] = NULL; 253154047Sgrehan } 254154047Sgrehan if ((trussinfo->flags & EXECVEENVS) == 0) 255154047Sgrehan if (fsc.s_args[2]) { 256154047Sgrehan free(fsc.s_args[2]); 257154047Sgrehan fsc.s_args[2] = NULL; 258154047Sgrehan } 259154047Sgrehan } 260154047Sgrehan 261154047Sgrehan print_syscall(trussinfo, fsc.name, fsc.nargs, fsc.s_args); 262154047Sgrehan fprintf(trussinfo->outfile, "\n"); 263154047Sgrehan } 264154047Sgrehan 265154047Sgrehan return; 266154047Sgrehan} 267154047Sgrehan 268154047Sgrehan/* 269154047Sgrehan * And when the system call is done, we handle it here. 270154047Sgrehan * Currently, no attempt is made to ensure that the system calls 271154047Sgrehan * match -- this needs to be fixed (and is, in fact, why S_SCX includes 272154047Sgrehan * the sytem call number instead of, say, an error status). 273154047Sgrehan */ 274154047Sgrehan 275154047Sgrehanlong 276154047Sgrehanpowerpc_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) 277154047Sgrehan{ 278154047Sgrehan char buf[32]; 279154047Sgrehan struct reg regs; 280154047Sgrehan long retval; 281154047Sgrehan int i; 282154047Sgrehan int errorp; 283154047Sgrehan struct syscall *sc; 284154047Sgrehan 285154047Sgrehan if (fd == -1 || trussinfo->pid != cpid) { 286154047Sgrehan sprintf(buf, "/proc/%d/regs", trussinfo->pid); 287154047Sgrehan fd = open(buf, O_RDONLY); 288154047Sgrehan if (fd == -1) { 289154047Sgrehan fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n"); 290154047Sgrehan return (-1); 291154047Sgrehan } 292154047Sgrehan cpid = trussinfo->pid; 293154047Sgrehan } 294154047Sgrehan 295154047Sgrehan lseek(fd, 0L, 0); 296154047Sgrehan if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) { 297154047Sgrehan fprintf(trussinfo->outfile, "\n"); 298154047Sgrehan return (-1); 299154047Sgrehan } 300154047Sgrehan retval = regs.fixreg[3]; 301154047Sgrehan errorp = !!(regs.cr & 0x10000000); 302154047Sgrehan 303154047Sgrehan /* 304154047Sgrehan * This code, while simpler than the initial versions I used, could 305154047Sgrehan * stand some significant cleaning. 306154047Sgrehan */ 307154047Sgrehan 308154047Sgrehan sc = fsc.sc; 309154047Sgrehan if (!sc) { 310154047Sgrehan for (i = 0; i < fsc.nargs; i++) 311154047Sgrehan asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]); 312154047Sgrehan } else { 313154047Sgrehan /* 314154047Sgrehan * On 32-bit big-endian, the low word of a 64-bit return is 315154047Sgrehan * in the greater address. Switch to this. XXX note that 316154047Sgrehan * print_syscall_ret can't handle 64-bit return values (llseek) 317154047Sgrehan */ 318154047Sgrehan if (sc->ret_type == 2) 319154047Sgrehan retval = regs.fixreg[4]; 320154047Sgrehan 321154047Sgrehan /* 322154047Sgrehan * Here, we only look for arguments that have OUT masked in -- 323154047Sgrehan * otherwise, they were handled in the syscall_entry function. 324154047Sgrehan */ 325154047Sgrehan for (i = 0; i < sc->nargs; i++) { 326154047Sgrehan char *temp; 327154047Sgrehan if (sc->args[i].type & OUT) { 328154047Sgrehan /* 329154047Sgrehan * If an error occurred, than don't bothe getting the data; 330154047Sgrehan * it may not be valid. 331154047Sgrehan */ 332154047Sgrehan if (errorp) 333154047Sgrehan asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]); 334154047Sgrehan else 335154047Sgrehan temp = print_arg(Procfd, &sc->args[i], fsc.args, retval, trussinfo); 336154047Sgrehan fsc.s_args[i] = temp; 337154047Sgrehan } 338154047Sgrehan } 339154047Sgrehan } 340154047Sgrehan 341154047Sgrehan /* 342154047Sgrehan * It would probably be a good idea to merge the error handling, 343154047Sgrehan * but that complicates things considerably. 344154047Sgrehan */ 345154047Sgrehan 346154047Sgrehan print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval); 347154047Sgrehan clear_fsc(); 348154047Sgrehan 349154047Sgrehan return (retval); 350154047Sgrehan} 351