1175b23f77
Avoid always using an O(n^2) loop over known syscall structures with strcmp() on each system call. Instead, use a per-ABI cache indexed by the system call number. The first 1024 system calls (which should cover all of the normal system calls in currently-supported ABIs) use a flat array indexed by the system call number to find system call structure. For other system calls, a linked list of structures storing an integer to structure mapping is stored in the ABI. The linked list isn't very smart, but it should only be used by buggy applications invoking unknown system calls. This also fixes handling of unknown system calls which currently trigger a NULL pointer dereference. Reviewed by: kib MFC after: 2 weeks
124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
/*
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* Copyright 2006 Peter Grehan <grehan@freebsd.org>
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* Copyright 2005 Orlando Bassotto <orlando@break.net>
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* Copyright 1998 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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*
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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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/* FreeBSD/powerpc-specific system call handling. */
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#include <sys/ptrace.h>
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#include <sys/syscall.h>
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#include <machine/reg.h>
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#include <machine/frame.h>
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#include <stdbool.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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powerpc_fetch_args(struct trussinfo *trussinfo, u_int narg)
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{
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struct ptrace_io_desc iorequest;
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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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u_int i, reg;
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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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* FreeBSD has two special kinds of system call redirections --
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* SYS_syscall, and SYS___syscall. The former is the old syscall()
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* routine, basically; the latter is for quad-aligned arguments.
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*
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* The system call argument count and code from ptrace() already
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* account for these, but we need to skip over the first argument.
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*/
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reg = 0;
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switch (regs.fixreg[0]) {
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case SYS_syscall:
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reg += 1;
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break;
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case SYS___syscall:
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reg += 2;
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break;
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}
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for (i = 0; i < narg && reg < NARGREG; i++, reg++) {
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cs->args[i] = regs.fixreg[FIRSTARG + reg];
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}
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if (narg > i) {
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iorequest.piod_op = PIOD_READ_D;
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iorequest.piod_offs = (void *)(regs.fixreg[1] + 8);
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iorequest.piod_addr = &cs->args[i];
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iorequest.piod_len = (narg - i) * sizeof(cs->args[0]);
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ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
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if (iorequest.piod_len == 0)
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return (-1);
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}
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return (0);
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}
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static int
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powerpc_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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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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/* XXX: Does not have fixup for __syscall(). */
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retval[0] = regs.fixreg[3];
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retval[1] = regs.fixreg[4];
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*errorp = !!(regs.cr & 0x10000000);
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return (0);
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}
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static struct procabi powerpc_freebsd = {
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"FreeBSD ELF32",
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SYSDECODE_ABI_FREEBSD,
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powerpc_fetch_args,
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powerpc_fetch_retval,
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STAILQ_HEAD_INITIALIZER(powerpc_freebsd.extra_syscalls),
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{ NULL }
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};
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PROCABI(powerpc_freebsd);
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