df57947f08
The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point. Initially, only tag files that use BSD 4-Clause "Original" license. RelNotes: yes Differential Revision: https://reviews.freebsd.org/D13133
117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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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 <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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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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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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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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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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STAILQ_HEAD_INITIALIZER(i386_linux.extra_syscalls),
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{ NULL }
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};
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PROCABI(i386_linux);
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