62919d788b
This is good enough to be able to run a RELENG_4 gdb binary against a RELENG_4 application, along with various other tools (eg: 4.x gcore). We use this at work. ia32_reg.[ch]: handle the 32 bit register file format, used by ptrace, procfs and core dumps. procfs_*regs.c: vary the format of proc/XXX/*regs depending on the client and target application. procfs_map.c: Don't print a 64 bit value to 32 bit consumers, or their sscanf fails. They expect an unsigned long. imgact_elf.c: produce a valid 32 bit coredump for 32 bit apps. sys_process.c: handle 32 bit consumers debugging 32 bit targets. Note that 64 bit consumers can still debug 32 bit targets. IA64 has got stubs for ia32_reg.c. Known limitations: a 5.x/6.x gdb uses get/setcontext(), which isn't implemented in the 32/64 wrapper yet. We also make a tiny patch to gdb pacify it over conflicting formats of ld-elf.so.1. Approved by: re
128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/*-
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* Copyright (c) 1993 Jan-Simon Pendry
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)procfs_fpregs.c 8.2 (Berkeley) 6/15/94
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*
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* From:
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* $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
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* $FreeBSD$
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*/
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.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/uio.h>
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#include <machine/reg.h>
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#include <fs/pseudofs/pseudofs.h>
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#include <fs/procfs/procfs.h>
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#ifdef COMPAT_IA32
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#include <sys/procfs.h>
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#include <machine/fpu.h>
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#include <compat/ia32/ia32_reg.h>
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extern struct sysentvec ia32_freebsd_sysvec;
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/*
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* PROC(write, fpregs, td2, &r) becomes
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* proc_write_fpregs(td2, &r) or
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* proc_write_fpregs32(td2, &r32)
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*
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* UIOMOVE_FROMBUF(r, uio) becomes
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* uiomove_frombuf(&r, sizeof(r), uio) or
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* uiomove_frombuf(&r32, sizeof(r32), uio)
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*/
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#define PROC(d, w, t, r) wrap32 ? \
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proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
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proc_ ## d ## _ ## w(t, r)
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#define UIOMOVE_FROMBUF(k, u) wrap32 ? \
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uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
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uiomove_frombuf(& k, sizeof(k), u)
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#else
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#define PROC(d, w, t, r) proc_ ## d ## _ ## w(t, r)
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#define UIOMOVE_FROMBUF(k, u) uiomove_frombuf(& k, sizeof(k), u)
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#endif
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int
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procfs_doprocfpregs(PFS_FILL_ARGS)
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{
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int error;
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struct fpreg r;
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struct thread *td2;
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#ifdef COMPAT_IA32
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struct fpreg32 r32;
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int wrap32 = 0;
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#endif
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PROC_LOCK(p);
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KASSERT(p->p_lock > 0, ("proc not held"));
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if (p_candebug(td, p)) {
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PROC_UNLOCK(p);
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return (EPERM);
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}
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/* XXXKSE: */
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td2 = FIRST_THREAD_IN_PROC(p);
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#ifdef COMPAT_IA32
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if (td->td_proc->p_sysent == &ia32_freebsd_sysvec) {
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if (td2->td_proc->p_sysent != &ia32_freebsd_sysvec) {
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PROC_UNLOCK(p);
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return (EINVAL);
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}
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wrap32 = 1;
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}
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#endif
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error = PROC(read, fpregs, td2, &r);
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if (error == 0) {
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PROC_UNLOCK(p);
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error = UIOMOVE_FROMBUF(r, uio);
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PROC_LOCK(p);
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}
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if (error == 0 && uio->uio_rw == UIO_WRITE) {
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if (!P_SHOULDSTOP(p))
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error = EBUSY;
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else
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/* XXXKSE: */
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error = PROC(write, fpregs, td2, &r);
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}
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PROC_UNLOCK(p);
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uio->uio_offset = 0;
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return (error);
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}
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