1/* 2 * Copyright 1997 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/arm-specific system call handling. */ 36 37#include <sys/ptrace.h> 38#include <sys/syscall.h> 39 40#include <machine/reg.h> 41#include <machine/armreg.h> 42#include <machine/ucontext.h> 43 44#include <stdio.h> 45 46#include "truss.h" 47 48#include "syscalls.h" 49 50static int 51arm_fetch_args(struct trussinfo *trussinfo, u_int narg) 52{ 53 struct ptrace_io_desc iorequest; 54 struct reg regs; 55 struct current_syscall *cs; 56 lwpid_t tid; 57 u_int i, reg, syscall_num; 58 59 tid = trussinfo->curthread->tid; 60 cs = &trussinfo->curthread->cs; 61 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 62 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 63 return (-1); 64 } 65 66 /* 67 * FreeBSD has two special kinds of system call redirections -- 68 * SYS_syscall, and SYS___syscall. The former is the old syscall() 69 * routine, basically; the latter is for quad-aligned arguments. 70 * 71 * The system call argument count and code from ptrace() already 72 * account for these, but we need to skip over the first argument. 73 */ 74#ifdef __ARM_EABI__ 75 syscall_num = regs.r[7]; 76#else 77 if ((syscall_num = ptrace(PT_READ_I, tid, 78 (caddr_t)(regs.r[_REG_PC] - INSN_SIZE), 0)) == -1) { 79 fprintf(trussinfo->outfile, "-- CANNOT READ PC --\n"); 80 return (-1); 81 } 82 syscall_num = syscall_num & 0x000fffff; 83#endif 84 85 reg = 0; 86 switch (syscall_num) { 87 case SYS_syscall: 88 reg = 1; 89 break; 90 case SYS___syscall: 91 reg = 2; 92 break; 93 } 94 95 for (i = 0; i < narg && reg < 4; i++, reg++) 96 cs->args[i] = regs.r[reg]; 97 if (narg > i) { 98 iorequest.piod_op = PIOD_READ_D; 99 iorequest.piod_offs = (void *)(regs.r_sp + 100 4 * sizeof(uint32_t)); 101 iorequest.piod_addr = &cs->args[i]; 102 iorequest.piod_len = (narg - i) * sizeof(cs->args[0]); 103 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0); 104 if (iorequest.piod_len == 0) 105 return (-1); 106 } 107 108 return (0); 109} 110 111static int 112arm_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp) 113{ 114 struct reg regs; 115 lwpid_t tid; 116 117 tid = trussinfo->curthread->tid; 118 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 119 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 120 return (-1); 121 } 122 123 /* XXX: Does not have the __ARMEB__ handling for __syscall(). */ 124 retval[0] = regs.r[0]; 125 retval[1] = regs.r[1]; 126 *errorp = !!(regs.r_cpsr & PSR_C); 127 return (0); 128} 129 130static struct procabi arm_fbsd = { 131 "FreeBSD ELF32", 132 syscallnames, 133 nitems(syscallnames), 134 arm_fetch_args, 135 arm_fetch_retval 136}; 137 138PROCABI(arm_fbsd); 139