zenithsiz/ftmemsim-valgrind
1
0
Fork 0
mirror of https://github.com/Zenithsiz/ftmemsim-valgrind.git synced 2026-02-04 02:18:37 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
ftmemsim-valgrind/coregrind/m_debugger.c
Julian Seward 5343a25e2b Minor tidyings to the debugger-attach code, as part of a failed 
attempt to fix debugger attach on ppc32-linux and ppc64-linux (see
#151908).  The fork/ptrace-based mechanism works fine for x86-linux
and amd64-linux but not on ppc.  I have no idea what is going on.

It seems like the forked child process (to which we will attach GDB)
does not stop when it does PTRACE_TRACE_ME and so things go downhill
very rapidly after that.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7184
2007-11-19 02:01:01 +00:00

263 lines
11 KiB
C
Raw Blame History

/*--------------------------------------------------------------------*/
/*--- Attaching a debugger. m_debugger.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2007 Julian Seward
jseward@acm.org
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#include "pub_core_basics.h"
#include "pub_core_vki.h"
#include "pub_core_threadstate.h"
#include "pub_core_xarray.h"
#include "pub_core_clientstate.h"
#include "pub_core_debugger.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcprint.h"
#include "pub_core_libcproc.h"
#include "pub_core_libcsignal.h"
#include "pub_core_libcassert.h"
#include "pub_core_options.h"
#define WIFSTOPPED(status) (((status) & 0xff) == 0x7f)
#define WSTOPSIG(status) (((status) & 0xff00) >> 8)
static Int ptrace_setregs(Int pid, VexGuestArchState* vex)
{
#if defined(VGP_x86_linux)
struct vki_user_regs_struct regs;
regs.cs = vex->guest_CS;
regs.ss = vex->guest_SS;
regs.ds = vex->guest_DS;
regs.es = vex->guest_ES;
regs.fs = vex->guest_FS;
regs.gs = vex->guest_GS;
regs.eax = vex->guest_EAX;
regs.ebx = vex->guest_EBX;
regs.ecx = vex->guest_ECX;
regs.edx = vex->guest_EDX;
regs.esi = vex->guest_ESI;
regs.edi = vex->guest_EDI;
regs.ebp = vex->guest_EBP;
regs.esp = vex->guest_ESP;
regs.eflags = LibVEX_GuestX86_get_eflags(vex);
regs.eip = vex->guest_EIP;
return VG_(ptrace)(VKI_PTRACE_SETREGS, pid, NULL, &regs);
#elif defined(VGP_amd64_linux)
struct vki_user_regs_struct regs;
regs.rax = vex->guest_RAX;
regs.rbx = vex->guest_RBX;
regs.rcx = vex->guest_RCX;
regs.rdx = vex->guest_RDX;
regs.rsi = vex->guest_RSI;
regs.rdi = vex->guest_RDI;
regs.rbp = vex->guest_RBP;
regs.rsp = vex->guest_RSP;
regs.r8 = vex->guest_R8;
regs.r9 = vex->guest_R9;
regs.r10 = vex->guest_R10;
regs.r11 = vex->guest_R11;
regs.r12 = vex->guest_R12;
regs.r13 = vex->guest_R13;
regs.r14 = vex->guest_R14;
regs.r15 = vex->guest_R15;
regs.eflags = LibVEX_GuestAMD64_get_rflags(vex);
regs.rip = vex->guest_RIP;
/* Set %{c,d,e,f,s,g}s and %{fs,gs}_base (whatever those are) to
values which don't fail the kernel's sanity checks. I have no
idea what these should really be set to. Anyway, mostly it
seems that zero is an allowable value, except for %cs and %ss
which have to have their lowest 2 bits be 11. See putreg() in
linux-2.6.23/arch/x86_64/kernel/ptrace.c for the apparently
relevant sanity checks. This fixes #145622. */
regs.cs = 3;
regs.ds = 0;
regs.es = 0;
regs.fs = 0;
regs.ss = 3;
regs.gs = 0;
regs.fs_base = 0;
regs.gs_base = 0;
return VG_(ptrace)(VKI_PTRACE_SETREGS, pid, NULL, &regs);
#elif defined(VGP_ppc32_linux)
Int rc = 0;
/* apparently the casting to void* is the Right Thing To Do */
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R0 * 4), (void*)vex->guest_GPR0);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R1 * 4), (void*)vex->guest_GPR1);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R2 * 4), (void*)vex->guest_GPR2);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R3 * 4), (void*)vex->guest_GPR3);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R4 * 4), (void*)vex->guest_GPR4);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R5 * 4), (void*)vex->guest_GPR5);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R6 * 4), (void*)vex->guest_GPR6);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R7 * 4), (void*)vex->guest_GPR7);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R8 * 4), (void*)vex->guest_GPR8);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R9 * 4), (void*)vex->guest_GPR9);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R10 * 4), (void*)vex->guest_GPR10);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R11 * 4), (void*)vex->guest_GPR11);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R12 * 4), (void*)vex->guest_GPR12);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R13 * 4), (void*)vex->guest_GPR13);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R14 * 4), (void*)vex->guest_GPR14);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R15 * 4), (void*)vex->guest_GPR15);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R16 * 4), (void*)vex->guest_GPR16);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R17 * 4), (void*)vex->guest_GPR17);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R18 * 4), (void*)vex->guest_GPR18);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R19 * 4), (void*)vex->guest_GPR19);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R20 * 4), (void*)vex->guest_GPR20);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R21 * 4), (void*)vex->guest_GPR21);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R22 * 4), (void*)vex->guest_GPR22);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R23 * 4), (void*)vex->guest_GPR23);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R24 * 4), (void*)vex->guest_GPR24);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R25 * 4), (void*)vex->guest_GPR25);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R26 * 4), (void*)vex->guest_GPR26);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R27 * 4), (void*)vex->guest_GPR27);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R28 * 4), (void*)vex->guest_GPR28);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R29 * 4), (void*)vex->guest_GPR29);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R30 * 4), (void*)vex->guest_GPR30);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_R31 * 4), (void*)vex->guest_GPR31);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_NIP * 4), (void*)vex->guest_CIA);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_CCR * 4),
(void*)LibVEX_GuestPPC32_get_CR(vex));
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_LNK * 4), (void*)vex->guest_LR);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_CTR * 4), (void*)vex->guest_CTR);
rc |= VG_(ptrace)(VKI_PTRACE_POKEUSR, pid, (void*)(VKI_PT_XER * 4),
(void*)LibVEX_GuestPPC32_get_XER(vex));
return rc;
#elif defined(VGP_ppc64_linux)
I_die_here;
#elif defined(VGP_ppc32_aix5)
I_die_here;
#elif defined(VGP_ppc64_aix5)
I_die_here;
#else
# error Unknown arch
#endif
}
/* Start debugger and get it to attach to this process. Called if the
user requests this service after an error has been shown, so she can
poke around and look at parameters, memory, etc. You can't
meaningfully get the debugger to continue the program, though; to
continue, quit the debugger. */
void VG_(start_debugger) ( ThreadId tid )
{
# define N_BUF 4096
Int pid, rc;
pid = VG_(fork)();
if (pid == 0) {
vki_sigset_t set;
/* child */
rc = VG_(ptrace)(VKI_PTRACE_TRACEME, 0, NULL, NULL);
vg_assert(rc == 0);
rc = VG_(kill)(VG_(getpid)(), VKI_SIGSTOP);
vg_assert(rc == 0);
} else if (pid > 0) {
/* parent */
Int status;
Int res;
if ((res = VG_(waitpid)(pid, &status, 0)) == pid &&
WIFSTOPPED(status) && WSTOPSIG(status) == VKI_SIGSTOP &&
ptrace_setregs(pid, &(VG_(threads)[tid].arch.vex)) == 0 &&
VG_(kill)(pid, VKI_SIGSTOP) == 0 &&
VG_(ptrace)(VKI_PTRACE_DETACH, pid, NULL, 0) == 0)
{
Char pidbuf[15];
Char file[50];
Char buf[N_BUF];
Char *bufptr;
Char *cmdptr;
VG_(sprintf)(pidbuf, "%d", pid);
VG_(sprintf)(file, "/proc/%d/fd/%d", pid, VG_(cl_exec_fd));
bufptr = buf;
cmdptr = VG_(clo_db_command);
while (*cmdptr) {
/* each iteration can advance bufptr by at most the length
of file[], so the following assertion is generously
over-paranoid. */
vg_assert(bufptr - buf < N_BUF-15-50-10/*paranoia*/);
switch (*cmdptr) {
case '%':
switch (*++cmdptr) {
case 'f':
VG_(memcpy)(bufptr, file, VG_(strlen)(file));
bufptr += VG_(strlen)(file);
cmdptr++;
break;
case 'p':
VG_(memcpy)(bufptr, pidbuf, VG_(strlen)(pidbuf));
bufptr += VG_(strlen)(pidbuf);
cmdptr++;
break;
default:
*bufptr++ = *cmdptr++;
break;
}
break;
default:
*bufptr++ = *cmdptr++;
break;
}
vg_assert(bufptr - buf < N_BUF-15-50-10/*paranoia*/);
}
*bufptr++ = '\0';
VG_(message)(Vg_UserMsg, "starting debugger with cmd: %s", buf);
res = VG_(system)(buf);
if (res == 0) {
VG_(message)(Vg_UserMsg, "");
VG_(message)(Vg_UserMsg,
"Debugger has detached. Valgrind regains control. We continue.");
} else {
VG_(message)(Vg_UserMsg, "Apparently failed!");
VG_(message)(Vg_UserMsg, "");
}
}
VG_(kill)(pid, VKI_SIGKILL);
VG_(waitpid)(pid, &status, 0);
}
# undef N_BUF
}
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
Reference in New Issue View Git Blame Copy Permalink