1/* 2 * Copyright 1998 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("$FreeBSD$"); 34 35/* FreeBSD/mips-specific system call handling. */ 36 37#include <sys/ptrace.h> 38#include <sys/syscall.h> 39 40#include <machine/frame.h> 41#include <machine/reg.h> 42 43#include <stdio.h> 44 45#include "truss.h" 46 47#include "syscalls.h" 48 49static int 50mips_fetch_args(struct trussinfo *trussinfo, u_int narg) 51{ 52 struct ptrace_io_desc iorequest; 53 struct reg regs; 54 struct current_syscall *cs; 55 lwpid_t tid; 56 u_int i, reg; 57 58 tid = trussinfo->curthread->tid; 59 cs = &trussinfo->curthread->cs; 60 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 61 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 62 return (-1); 63 } 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 reg = A0; 74 switch (regs.r_regs[V0]) { 75 case SYS_syscall: 76 reg = A1; 77 break; 78 case SYS___syscall: 79#if defined(__mips_n32) || defined(__mips_n64) 80 reg = A1; 81#else 82 reg = A2; 83#endif 84 break; 85 } 86 87#if defined(__mips_n32) || defined(__mips_n64) 88#define MAXREG A7 89#else 90#define MAXREG A3 91#endif 92 93 for (i = 0; i < narg && reg <= MAXREG; i++, reg++) 94 cs->args[i] = regs.r_regs[reg]; 95 if (narg > i) { 96 iorequest.piod_op = PIOD_READ_D; 97 iorequest.piod_offs = (void *)((uintptr_t)regs.r_regs[SP] + 98 4 * sizeof(cs->args[0])); 99 iorequest.piod_addr = &cs->args[i]; 100 iorequest.piod_len = (narg - i) * sizeof(cs->args[0]); 101 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0); 102 if (iorequest.piod_len == 0) 103 return (-1); 104 } 105 106 return (0); 107} 108 109static int 110mips_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp) 111{ 112 struct reg regs; 113 lwpid_t tid; 114 115 tid = trussinfo->curthread->tid; 116 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 117 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 118 return (-1); 119 } 120 121 /* XXX: Does not have special handling for __syscall(). */ 122 retval[0] = regs.r_regs[V0]; 123 retval[1] = regs.r_regs[V1]; 124 *errorp = !!regs.r_regs[A3]; 125 return (0); 126} 127 128 129static struct procabi mips_fbsd = { 130#ifdef __mips_n64 131 "FreeBSD ELF64", 132#else 133 "FreeBSD ELF32", 134#endif 135 syscallnames, 136 nitems(syscallnames), 137 mips_fetch_args, 138 mips_fetch_retval 139}; 140 141PROCABI(mips_fbsd); 142