139 lines
4.0 KiB
C
139 lines
4.0 KiB
C
/*
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* Copyright 1997 Sean Eric Fagan
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Sean Eric Fagan
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* 4. Neither the name of the author may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/* Linux/i386-specific system call handling. */
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include <machine/psl.h>
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#include <stdio.h>
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#include <sysdecode.h>
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#include "truss.h"
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static int
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i386_linux_fetch_args(struct trussinfo *trussinfo, u_int narg)
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{
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struct reg regs;
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struct current_syscall *cs;
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lwpid_t tid;
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tid = trussinfo->curthread->tid;
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cs = &trussinfo->curthread->cs;
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if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
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fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
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return (-1);
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}
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/*
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* Linux passes syscall arguments in registers, not
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* on the stack. Fortunately, we've got access to the
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* register set. Note that we don't bother checking the
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* number of arguments. And what does linux do for syscalls
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* that have more than five arguments?
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*/
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switch (narg) {
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default:
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cs->args[5] = regs.r_ebp; /* Unconfirmed */
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case 5:
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cs->args[4] = regs.r_edi;
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case 4:
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cs->args[3] = regs.r_esi;
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case 3:
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cs->args[2] = regs.r_edx;
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case 2:
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cs->args[1] = regs.r_ecx;
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case 1:
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cs->args[0] = regs.r_ebx;
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}
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return (0);
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}
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/*
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* Linux syscalls return negative errno's, we do positive and map them
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*/
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static const int bsd_to_linux_errno[] = {
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-0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
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-10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
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-20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
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-30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
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-90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
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-100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
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-110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
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-116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
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-6,
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};
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static int
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i386_linux_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
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{
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struct reg regs;
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lwpid_t tid;
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size_t i;
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tid = trussinfo->curthread->tid;
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if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
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fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
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return (-1);
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}
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retval[0] = regs.r_eax;
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retval[1] = regs.r_edx;
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*errorp = !!(regs.r_eflags & PSL_C);
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if (*errorp) {
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for (i = 0; i < nitems(bsd_to_linux_errno); i++) {
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if (retval[0] == bsd_to_linux_errno[i]) {
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retval[0] = i;
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return (0);
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}
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}
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/* XXX: How to handle unknown errors? */
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}
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return (0);
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}
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static struct procabi i386_linux = {
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"Linux ELF",
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SYSDECODE_ABI_LINUX,
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i386_linux_fetch_args,
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i386_linux_fetch_retval
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};
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PROCABI(i386_linux);
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