i386-linux.c revision 295637
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: head/usr.bin/truss/i386-linux.c 295637 2016-02-15 20:27:16Z jhb $"); 34 35/* Linux/i386-specific system call handling. */ 36 37#include <sys/ptrace.h> 38 39#include <machine/reg.h> 40#include <machine/psl.h> 41 42#include <stdio.h> 43#include <sysdecode.h> 44 45#include "truss.h" 46 47static int 48i386_linux_fetch_args(struct trussinfo *trussinfo, u_int narg) 49{ 50 struct reg regs; 51 struct current_syscall *cs; 52 lwpid_t tid; 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 * Linux passes syscall arguments in registers, not 63 * on the stack. Fortunately, we've got access to the 64 * register set. Note that we don't bother checking the 65 * number of arguments. And what does linux do for syscalls 66 * that have more than five arguments? 67 */ 68 switch (narg) { 69 default: 70 cs->args[5] = regs.r_ebp; /* Unconfirmed */ 71 case 5: 72 cs->args[4] = regs.r_edi; 73 case 4: 74 cs->args[3] = regs.r_esi; 75 case 3: 76 cs->args[2] = regs.r_edx; 77 case 2: 78 cs->args[1] = regs.r_ecx; 79 case 1: 80 cs->args[0] = regs.r_ebx; 81 } 82 83 return (0); 84} 85 86/* 87 * Linux syscalls return negative errno's, we do positive and map them 88 */ 89static const int bsd_to_linux_errno[] = { 90 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 91 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 92 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 93 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 94 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 95 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 96 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 97 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 98 -6, 99}; 100 101static int 102i386_linux_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp) 103{ 104 struct reg regs; 105 lwpid_t tid; 106 size_t i; 107 108 tid = trussinfo->curthread->tid; 109 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 110 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 111 return (-1); 112 } 113 114 retval[0] = regs.r_eax; 115 retval[1] = regs.r_edx; 116 *errorp = !!(regs.r_eflags & PSL_C); 117 118 if (*errorp) { 119 for (i = 0; i < nitems(bsd_to_linux_errno); i++) { 120 if (retval[0] == bsd_to_linux_errno[i]) { 121 retval[0] = i; 122 return (0); 123 } 124 } 125 126 /* XXX: How to handle unknown errors? */ 127 } 128 return (0); 129} 130 131static struct procabi i386_linux = { 132 "Linux ELF", 133 SYSDECODE_ABI_LINUX, 134 i386_linux_fetch_args, 135 i386_linux_fetch_retval 136}; 137 138PROCABI(i386_linux); 139