In preparation for machine-independent sys/compat/linux/linux_ptrace.c, rename the i386-specific Linux ptrace(2) implementation. No functional changes. Sponsored By: EPSRC Differential Revision: https://reviews.freebsd.org/D32757
474 lines
12 KiB
C
474 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2001 Alexander Kabaev
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* All rights reserved.
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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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#include "opt_cpu.h"
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/ptrace.h>
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#include <sys/syscallsubr.h>
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#include <sys/systm.h>
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#include <machine/md_var.h>
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#include <machine/pcb.h>
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#include <i386/linux/linux.h>
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#include <i386/linux/linux_proto.h>
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#include <compat/linux/linux_signal.h>
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/*
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* Linux ptrace requests numbers. Mostly identical to FreeBSD,
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* except for MD ones and PT_ATTACH/PT_DETACH.
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*/
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#define PTRACE_TRACEME 0
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#define PTRACE_PEEKTEXT 1
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#define PTRACE_PEEKDATA 2
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#define PTRACE_PEEKUSR 3
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#define PTRACE_POKETEXT 4
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#define PTRACE_POKEDATA 5
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#define PTRACE_POKEUSR 6
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#define PTRACE_CONT 7
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#define PTRACE_KILL 8
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#define PTRACE_SINGLESTEP 9
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#define PTRACE_ATTACH 16
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#define PTRACE_DETACH 17
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#define LINUX_PTRACE_SYSCALL 24
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#define PTRACE_GETREGS 12
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#define PTRACE_SETREGS 13
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#define PTRACE_GETFPREGS 14
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#define PTRACE_SETFPREGS 15
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#define PTRACE_GETFPXREGS 18
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#define PTRACE_SETFPXREGS 19
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#define PTRACE_SETOPTIONS 21
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/*
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* Linux keeps debug registers at the following
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* offset in the user struct
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*/
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#define LINUX_DBREG_OFFSET 252
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#define LINUX_DBREG_SIZE (8*sizeof(l_int))
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static __inline int
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map_signum(int signum)
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{
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signum = linux_to_bsd_signal(signum);
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return ((signum == SIGSTOP)? 0 : signum);
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}
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struct linux_pt_reg {
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l_long ebx;
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l_long ecx;
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l_long edx;
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l_long esi;
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l_long edi;
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l_long ebp;
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l_long eax;
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l_int xds;
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l_int xes;
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l_int xfs;
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l_int xgs;
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l_long orig_eax;
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l_long eip;
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l_int xcs;
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l_long eflags;
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l_long esp;
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l_int xss;
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};
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/*
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* Translate i386 ptrace registers between Linux and FreeBSD formats.
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* The translation is pretty straighforward, for all registers, but
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* orig_eax on Linux side and r_trapno and r_err in FreeBSD
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*/
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static void
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map_regs_to_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r)
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{
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linux_r->ebx = bsd_r->r_ebx;
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linux_r->ecx = bsd_r->r_ecx;
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linux_r->edx = bsd_r->r_edx;
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linux_r->esi = bsd_r->r_esi;
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linux_r->edi = bsd_r->r_edi;
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linux_r->ebp = bsd_r->r_ebp;
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linux_r->eax = bsd_r->r_eax;
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linux_r->xds = bsd_r->r_ds;
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linux_r->xes = bsd_r->r_es;
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linux_r->xfs = bsd_r->r_fs;
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linux_r->xgs = bsd_r->r_gs;
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linux_r->orig_eax = bsd_r->r_eax;
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linux_r->eip = bsd_r->r_eip;
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linux_r->xcs = bsd_r->r_cs;
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linux_r->eflags = bsd_r->r_eflags;
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linux_r->esp = bsd_r->r_esp;
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linux_r->xss = bsd_r->r_ss;
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}
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static void
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map_regs_from_linux(struct reg *bsd_r, struct linux_pt_reg *linux_r)
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{
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bsd_r->r_ebx = linux_r->ebx;
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bsd_r->r_ecx = linux_r->ecx;
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bsd_r->r_edx = linux_r->edx;
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bsd_r->r_esi = linux_r->esi;
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bsd_r->r_edi = linux_r->edi;
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bsd_r->r_ebp = linux_r->ebp;
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bsd_r->r_eax = linux_r->eax;
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bsd_r->r_ds = linux_r->xds;
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bsd_r->r_es = linux_r->xes;
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bsd_r->r_fs = linux_r->xfs;
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bsd_r->r_gs = linux_r->xgs;
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bsd_r->r_eip = linux_r->eip;
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bsd_r->r_cs = linux_r->xcs;
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bsd_r->r_eflags = linux_r->eflags;
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bsd_r->r_esp = linux_r->esp;
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bsd_r->r_ss = linux_r->xss;
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}
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struct linux_pt_fpreg {
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l_long cwd;
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l_long swd;
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l_long twd;
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l_long fip;
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l_long fcs;
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l_long foo;
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l_long fos;
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l_long st_space[2*10];
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};
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static void
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map_fpregs_to_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r)
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{
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linux_r->cwd = bsd_r->fpr_env[0];
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linux_r->swd = bsd_r->fpr_env[1];
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linux_r->twd = bsd_r->fpr_env[2];
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linux_r->fip = bsd_r->fpr_env[3];
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linux_r->fcs = bsd_r->fpr_env[4];
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linux_r->foo = bsd_r->fpr_env[5];
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linux_r->fos = bsd_r->fpr_env[6];
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bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(linux_r->st_space));
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}
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static void
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map_fpregs_from_linux(struct fpreg *bsd_r, struct linux_pt_fpreg *linux_r)
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{
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bsd_r->fpr_env[0] = linux_r->cwd;
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bsd_r->fpr_env[1] = linux_r->swd;
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bsd_r->fpr_env[2] = linux_r->twd;
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bsd_r->fpr_env[3] = linux_r->fip;
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bsd_r->fpr_env[4] = linux_r->fcs;
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bsd_r->fpr_env[5] = linux_r->foo;
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bsd_r->fpr_env[6] = linux_r->fos;
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bcopy(bsd_r->fpr_acc, linux_r->st_space, sizeof(bsd_r->fpr_acc));
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}
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struct linux_pt_fpxreg {
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l_ushort cwd;
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l_ushort swd;
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l_ushort twd;
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l_ushort fop;
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l_long fip;
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l_long fcs;
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l_long foo;
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l_long fos;
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l_long mxcsr;
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l_long reserved;
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l_long st_space[32];
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l_long xmm_space[32];
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l_long padding[56];
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};
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static int
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linux_proc_read_fpxregs(struct thread *td, struct linux_pt_fpxreg *fpxregs)
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{
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PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
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if (cpu_fxsr == 0 || (td->td_proc->p_flag & P_INMEM) == 0)
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return (EIO);
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bcopy(&get_pcb_user_save_td(td)->sv_xmm, fpxregs, sizeof(*fpxregs));
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return (0);
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}
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static int
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linux_proc_write_fpxregs(struct thread *td, struct linux_pt_fpxreg *fpxregs)
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{
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PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
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if (cpu_fxsr == 0 || (td->td_proc->p_flag & P_INMEM) == 0)
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return (EIO);
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bcopy(fpxregs, &get_pcb_user_save_td(td)->sv_xmm, sizeof(*fpxregs));
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return (0);
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}
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int
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linux_ptrace(struct thread *td, struct linux_ptrace_args *uap)
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{
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union {
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struct linux_pt_reg reg;
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struct linux_pt_fpreg fpreg;
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struct linux_pt_fpxreg fpxreg;
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} r;
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union {
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struct reg bsd_reg;
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struct fpreg bsd_fpreg;
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struct dbreg bsd_dbreg;
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} u;
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void *addr;
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pid_t pid;
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int error, req;
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error = 0;
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/* by default, just copy data intact */
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req = uap->req;
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pid = (pid_t)uap->pid;
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addr = (void *)uap->addr;
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switch (req) {
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case PTRACE_TRACEME:
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case PTRACE_POKETEXT:
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case PTRACE_POKEDATA:
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case PTRACE_KILL:
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error = kern_ptrace(td, req, pid, addr, uap->data);
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break;
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case PTRACE_PEEKTEXT:
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case PTRACE_PEEKDATA: {
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/* need to preserve return value */
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int rval = td->td_retval[0];
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error = kern_ptrace(td, req, pid, addr, 0);
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if (error == 0)
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error = copyout(td->td_retval, (void *)uap->data,
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sizeof(l_int));
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td->td_retval[0] = rval;
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break;
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}
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case PTRACE_DETACH:
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error = kern_ptrace(td, PT_DETACH, pid, (void *)1,
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map_signum(uap->data));
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break;
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case PTRACE_SINGLESTEP:
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case PTRACE_CONT:
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error = kern_ptrace(td, req, pid, (void *)1,
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map_signum(uap->data));
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break;
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case PTRACE_ATTACH:
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error = kern_ptrace(td, PT_ATTACH, pid, addr, uap->data);
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break;
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case PTRACE_GETREGS:
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/* Linux is using data where FreeBSD is using addr */
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error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0);
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if (error == 0) {
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map_regs_to_linux(&u.bsd_reg, &r.reg);
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error = copyout(&r.reg, (void *)uap->data,
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sizeof(r.reg));
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}
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break;
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case PTRACE_SETREGS:
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/* Linux is using data where FreeBSD is using addr */
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error = copyin((void *)uap->data, &r.reg, sizeof(r.reg));
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if (error == 0) {
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map_regs_from_linux(&u.bsd_reg, &r.reg);
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error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0);
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}
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break;
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case PTRACE_GETFPREGS:
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/* Linux is using data where FreeBSD is using addr */
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error = kern_ptrace(td, PT_GETFPREGS, pid, &u.bsd_fpreg, 0);
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if (error == 0) {
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map_fpregs_to_linux(&u.bsd_fpreg, &r.fpreg);
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error = copyout(&r.fpreg, (void *)uap->data,
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sizeof(r.fpreg));
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}
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break;
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case PTRACE_SETFPREGS:
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/* Linux is using data where FreeBSD is using addr */
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error = copyin((void *)uap->data, &r.fpreg, sizeof(r.fpreg));
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if (error == 0) {
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map_fpregs_from_linux(&u.bsd_fpreg, &r.fpreg);
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error = kern_ptrace(td, PT_SETFPREGS, pid,
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&u.bsd_fpreg, 0);
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}
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break;
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case PTRACE_SETFPXREGS:
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error = copyin((void *)uap->data, &r.fpxreg, sizeof(r.fpxreg));
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if (error)
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break;
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/* FALL THROUGH */
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case PTRACE_GETFPXREGS: {
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struct proc *p;
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struct thread *td2;
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if (sizeof(struct linux_pt_fpxreg) != sizeof(struct savexmm)) {
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static int once = 0;
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if (!once) {
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printf("linux: savexmm != linux_pt_fpxreg\n");
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once = 1;
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}
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error = EIO;
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break;
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}
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if ((p = pfind(uap->pid)) == NULL) {
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error = ESRCH;
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break;
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}
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/* Exiting processes can't be debugged. */
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if ((p->p_flag & P_WEXIT) != 0) {
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error = ESRCH;
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goto fail;
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}
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if ((error = p_candebug(td, p)) != 0)
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goto fail;
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/* System processes can't be debugged. */
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if ((p->p_flag & P_SYSTEM) != 0) {
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error = EINVAL;
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goto fail;
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}
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/* not being traced... */
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if ((p->p_flag & P_TRACED) == 0) {
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error = EPERM;
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goto fail;
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}
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/* not being traced by YOU */
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if (p->p_pptr != td->td_proc) {
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error = EBUSY;
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goto fail;
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}
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/* not currently stopped */
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if (!P_SHOULDSTOP(p) || (p->p_flag & P_WAITED) == 0) {
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error = EBUSY;
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goto fail;
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}
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if (req == PTRACE_GETFPXREGS) {
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_PHOLD(p); /* may block */
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td2 = FIRST_THREAD_IN_PROC(p);
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error = linux_proc_read_fpxregs(td2, &r.fpxreg);
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_PRELE(p);
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PROC_UNLOCK(p);
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if (error == 0)
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error = copyout(&r.fpxreg, (void *)uap->data,
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sizeof(r.fpxreg));
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} else {
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/* clear dangerous bits exactly as Linux does*/
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r.fpxreg.mxcsr &= 0xffbf;
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_PHOLD(p); /* may block */
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td2 = FIRST_THREAD_IN_PROC(p);
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error = linux_proc_write_fpxregs(td2, &r.fpxreg);
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_PRELE(p);
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PROC_UNLOCK(p);
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}
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break;
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fail:
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PROC_UNLOCK(p);
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break;
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}
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case PTRACE_PEEKUSR:
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case PTRACE_POKEUSR: {
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error = EIO;
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/* check addr for alignment */
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if (uap->addr < 0 || uap->addr & (sizeof(l_int) - 1))
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break;
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/*
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* Allow Linux programs to access register values in
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* user struct. We simulate this through PT_GET/SETREGS
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* as necessary.
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*/
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if (uap->addr < sizeof(struct linux_pt_reg)) {
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error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0);
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if (error != 0)
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break;
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map_regs_to_linux(&u.bsd_reg, &r.reg);
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if (req == PTRACE_PEEKUSR) {
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error = copyout((char *)&r.reg + uap->addr,
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(void *)uap->data, sizeof(l_int));
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break;
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}
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*(l_int *)((char *)&r.reg + uap->addr) =
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(l_int)uap->data;
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map_regs_from_linux(&u.bsd_reg, &r.reg);
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error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0);
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}
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/*
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* Simulate debug registers access
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*/
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if (uap->addr >= LINUX_DBREG_OFFSET &&
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uap->addr <= LINUX_DBREG_OFFSET + LINUX_DBREG_SIZE) {
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error = kern_ptrace(td, PT_GETDBREGS, pid, &u.bsd_dbreg,
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0);
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if (error != 0)
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break;
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uap->addr -= LINUX_DBREG_OFFSET;
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if (req == PTRACE_PEEKUSR) {
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error = copyout((char *)&u.bsd_dbreg +
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uap->addr, (void *)uap->data,
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sizeof(l_int));
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break;
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}
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*(l_int *)((char *)&u.bsd_dbreg + uap->addr) =
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uap->data;
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error = kern_ptrace(td, PT_SETDBREGS, pid,
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&u.bsd_dbreg, 0);
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}
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break;
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}
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case LINUX_PTRACE_SYSCALL:
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/* fall through */
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default:
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printf("linux: ptrace(%u, ...) not implemented\n",
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(unsigned int)uap->req);
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error = EINVAL;
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break;
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}
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return (error);
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}
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