usr.bin/truss/powerpc64-freebsd.c

   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("$FreeBSD$");
  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 <stdio.h>
  40 #include <sysdecode.h>
  41
  42 #include "truss.h"
  43
  44 static int
  45 powerpc64_fetch_args(struct trussinfo *trussinfo, u_int narg)
  46 {
  47         struct ptrace_io_desc iorequest;
  48         struct reg regs;
  49         struct current_syscall *cs;
  50         lwpid_t tid;
  51         u_int i, reg;
  52
  53         tid = trussinfo->curthread->tid;
  54         cs = &trussinfo->curthread->cs;
  55         if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
  56                 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
  57                 return (-1);
  58         }
  59
  60         /*
  61          * FreeBSD has two special kinds of system call redirections --
  62          * SYS_syscall, and SYS___syscall.  The former is the old syscall()
  63          * routine, basically; the latter is for quad-aligned arguments.
  64          *
  65          * The system call argument count and code from ptrace() already
  66          * account for these, but we need to skip over the first argument.
  67          */
  68         reg = 0;
  69         switch (regs.fixreg[0]) {
  70         case SYS_syscall:
  71         case SYS___syscall:
  72                 reg += 1;
  73                 break;
  74         }
  75
  76         for (i = 0; i < narg && reg < NARGREG; i++, reg++)
  77                 cs->args[i] = regs.fixreg[FIRSTARG + reg];
  78         if (narg > i) {
  79                 iorequest.piod_op = PIOD_READ_D;
  80                 iorequest.piod_offs = (void *)(regs.fixreg[1] + 48);
  81                 iorequest.piod_addr = &cs->args[i];
  82                 iorequest.piod_len = (narg - i) * sizeof(cs->args[0]);
  83                 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
  84                 if (iorequest.piod_len == 0)
  85                         return (-1);
  86         }
  87
  88         return (0);
  89 }
  90
  91 static int
  92 powerpc64_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
  93 {
  94         struct reg regs;
  95         lwpid_t tid;
  96
  97         tid = trussinfo->curthread->tid;
  98         if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
  99                 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
 100                 return (-1);
 101         }
 102
 103         retval[0] = regs.fixreg[3];
 104         retval[1] = regs.fixreg[4];
 105         *errorp = !!(regs.cr & 0x10000000);
 106         return (0);
 107 }
 108
 109 static struct procabi powerpc64_freebsd = {
 110         "FreeBSD ELF64",
 111         SYSDECODE_ABI_FREEBSD,
 112         powerpc64_fetch_args,
 113         powerpc64_fetch_retval
 114 };
 115
 116 PROCABI(powerpc64_freebsd);