/*--------------------------------------------------------------------*/
/*--- Assertions and panics. m_libcassert.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2013 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_vkiscnums.h"
#include "pub_core_threadstate.h"
#include "pub_core_gdbserver.h"
#include "pub_core_aspacemgr.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcassert.h"
#include "pub_core_libcprint.h"
#include "pub_core_libcproc.h" // For VG_(gettid)()
#include "pub_core_machine.h"
#include "pub_core_stacks.h"
#include "pub_core_stacktrace.h"
#include "pub_core_syscall.h"
#include "pub_core_tooliface.h" // For VG_(details).{name,bug_reports_to}
#include "pub_core_options.h" // For VG_(clo_xml)
/* ---------------------------------------------------------------------
Assertery.
------------------------------------------------------------------ */
#if defined(VGP_x86_linux) || defined(VGP_x86_darwin)
# define GET_STARTREGS(srP) \
{ UInt eip, esp, ebp; \
__asm__ __volatile__( \
"call 0f;" \
"0: popl %0;" \
"movl %%esp, %1;" \
"movl %%ebp, %2;" \
: "=r" (eip), "=r" (esp), "=r" (ebp) \
: /* reads none */ \
: "memory" \
); \
(srP)->r_pc = (ULong)eip; \
(srP)->r_sp = (ULong)esp; \
(srP)->misc.X86.r_ebp = ebp; \
}
#elif defined(VGP_amd64_linux) || defined(VGP_amd64_darwin)
# define GET_STARTREGS(srP) \
{ ULong rip, rsp, rbp; \
__asm__ __volatile__( \
"leaq 0(%%rip), %0;" \
"movq %%rsp, %1;" \
"movq %%rbp, %2;" \
: "=r" (rip), "=r" (rsp), "=r" (rbp) \
: /* reads none */ \
: "memory" \
); \
(srP)->r_pc = rip; \
(srP)->r_sp = rsp; \
(srP)->misc.AMD64.r_rbp = rbp; \
}
#elif defined(VGP_ppc32_linux)
# define GET_STARTREGS(srP) \
{ UInt cia, r1, lr; \
__asm__ __volatile__( \
"mflr 0;" /* r0 = lr */ \
"bl m_libcassert_get_ip;" /* lr = pc */ \
"m_libcassert_get_ip:\n" \
"mflr %0;" /* %0 = pc */ \
"mtlr 0;" /* restore lr */ \
"mr %1,1;" /* %1 = r1 */ \
"mr %2,0;" /* %2 = lr */ \
: "=r" (cia), "=r" (r1), "=r" (lr) \
: /* reads none */ \
: "r0" /* trashed */ \
); \
(srP)->r_pc = (ULong)cia; \
(srP)->r_sp = (ULong)r1; \
(srP)->misc.PPC32.r_lr = lr; \
}
#elif defined(VGP_ppc64be_linux) || defined(VGP_ppc64le_linux)
# define GET_STARTREGS(srP) \
{ ULong cia, r1, lr; \
__asm__ __volatile__( \
"mflr 0;" /* r0 = lr */ \
"bl .m_libcassert_get_ip;" /* lr = pc */ \
".m_libcassert_get_ip:\n" \
"mflr %0;" /* %0 = pc */ \
"mtlr 0;" /* restore lr */ \
"mr %1,1;" /* %1 = r1 */ \
"mr %2,0;" /* %2 = lr */ \
: "=r" (cia), "=r" (r1), "=r" (lr) \
: /* reads none */ \
: "r0" /* trashed */ \
); \
(srP)->r_pc = cia; \
(srP)->r_sp = r1; \
(srP)->misc.PPC64.r_lr = lr; \
}
#elif defined(VGP_arm_linux)
# define GET_STARTREGS(srP) \
{ UInt block[6]; \
__asm__ __volatile__( \
"str r15, [%0, #+0];" \
"str r14, [%0, #+4];" \
"str r13, [%0, #+8];" \
"str r12, [%0, #+12];" \
"str r11, [%0, #+16];" \
"str r7, [%0, #+20];" \
: /* out */ \
: /* in */ "r"(&block[0]) \
: /* trash */ "memory" \
); \
(srP)->r_pc = block[0] - 8; \
(srP)->misc.ARM.r14 = block[1]; \
(srP)->r_sp = block[2]; \
(srP)->misc.ARM.r12 = block[3]; \
(srP)->misc.ARM.r11 = block[4]; \
(srP)->misc.ARM.r7 = block[5]; \
}
#elif defined(VGP_arm64_linux)
# define GET_STARTREGS(srP) \
{ ULong block[4]; \
__asm__ __volatile__( \
"adr x19, 0;" \
"str x19, [%0, #+0];" /* pc */ \
"mov x19, sp;" \
"str x19, [%0, #+8];" /* sp */ \
"str x29, [%0, #+16];" /* fp */ \
"str x30, [%0, #+24];" /* lr */ \
: /* out */ \
: /* in */ "r"(&block[0]) \
: /* trash */ "memory","x19" \
); \
(srP)->r_pc = block[0]; \
(srP)->r_sp = block[1]; \
(srP)->misc.ARM64.x29 = block[2]; \
(srP)->misc.ARM64.x30 = block[3]; \
}
#elif defined(VGP_s390x_linux)
# define GET_STARTREGS(srP) \
{ ULong ia, sp, fp, lr; \
__asm__ __volatile__( \
"bras %0,0f;" \
"0: lgr %1,15;" \
"lgr %2,11;" \
"lgr %3,14;" \
: "=r" (ia), "=r" (sp),"=r" (fp),"=r" (lr) \
/* no read & clobber */ \
); \
(srP)->r_pc = ia; \
(srP)->r_sp = sp; \
(srP)->misc.S390X.r_fp = fp; \
(srP)->misc.S390X.r_lr = lr; \
}
#elif defined(VGP_mips32_linux)
# define GET_STARTREGS(srP) \
{ UInt pc, sp, fp, ra, gp; \
asm("move $8, $31;" /* t0 = ra */ \
"bal m_libcassert_get_ip;" /* ra = pc */ \
"m_libcassert_get_ip:\n" \
"move %0, $31;" \
"move $31, $8;" /* restore lr */ \
"move %1, $29;" \
"move %2, $30;" \
"move %3, $31;" \
"move %4, $28;" \
: "=r" (pc), \
"=r" (sp), \
"=r" (fp), \
"=r" (ra), \
"=r" (gp) \
: /* reads none */ \
: "$8" /* trashed */ ); \
(srP)->r_pc = (ULong)pc - 8; \
(srP)->r_sp = (ULong)sp; \
(srP)->misc.MIPS32.r30 = (ULong)fp; \
(srP)->misc.MIPS32.r31 = (ULong)ra; \
(srP)->misc.MIPS32.r28 = (ULong)gp; \
}
#elif defined(VGP_mips64_linux)
# define GET_STARTREGS(srP) \
{ ULong pc, sp, fp, ra, gp; \
asm("move $8, $31;" /* t0 = ra */ \
"bal m_libcassert_get_ip;" /* ra = pc */ \
"m_libcassert_get_ip:\n" \
"move %0, $31;" \
"move $31, $8;" /* restore lr */ \
"move %1, $29;" \
"move %2, $30;" \
"move %3, $31;" \
"move %4, $28;" \
: "=r" (pc), \
"=r" (sp), \
"=r" (fp), \
"=r" (ra), \
"=r" (gp) \
: /* reads none */ \
: "$8" /* trashed */ ); \
(srP)->r_pc = (ULong)pc - 8; \
(srP)->r_sp = (ULong)sp; \
(srP)->misc.MIPS64.r30 = (ULong)fp; \
(srP)->misc.MIPS64.r31 = (ULong)ra; \
(srP)->misc.MIPS64.r28 = (ULong)gp; \
}
#elif defined(VGP_tilegx_linux)
# define GET_STARTREGS(srP) \
{ ULong pc, sp, fp, ra; \
__asm__ __volatile__( \
"move r8, lr \n" \
"jal 0f \n" \
"0:\n" \
"move %0, lr \n" \
"move lr, r8 \n" /* put old lr back*/ \
"move %1, sp \n" \
"move %2, r52 \n" \
"move %3, lr \n" \
: "=r" (pc), \
"=r" (sp), \
"=r" (fp), \
"=r" (ra) \
: /* reads none */ \
: "%r8" /* trashed */ ); \
(srP)->r_pc = (ULong)pc - 8; \
(srP)->r_sp = (ULong)sp; \
(srP)->misc.TILEGX.r52 = (ULong)fp; \
(srP)->misc.TILEGX.r55 = (ULong)ra; \
}
#else
# error Unknown platform
#endif
#define BACKTRACE_DEPTH 100 // nice and deep!
__attribute__ ((__noreturn__))
static void exit_wrk( Int status, Bool gdbserver_call_allowed)
{
static Bool exit_called = False;
// avoid recursive exit during gdbserver call.
if (gdbserver_call_allowed && !exit_called) {
const ThreadId atid = 1; // Arbitrary tid used to call/terminate gdbsrv.
exit_called = True;
if (status != 0 && VG_(gdbserver_stop_at) (VgdbStopAt_ValgrindAbExit)) {
if (VG_(gdbserver_init_done)()) {
VG_(umsg)("(action at valgrind abnormal exit) vgdb me ... \n");
VG_(gdbserver) (atid);
} else {
VG_(umsg)("(action at valgrind abnormal exit) "
"Early valgrind exit : vgdb not yet usable\n");
}
}
if (VG_(gdbserver_init_done)()) {
// Always terminate the gdbserver when Valgrind exits, so as
// to e.g. cleanup the FIFOs.
VG_(gdbserver_exit) (atid,
status == 0 ? VgSrc_ExitProcess : VgSrc_FatalSig);
}
}
exit_called = True;
VG_(exit_now) (status);
}
/* Call the appropriate system call and nothing else. This function should
be called in places where the dependencies of VG_(exit) need to be
avoided. */
__attribute__ ((__noreturn__))
void VG_(exit_now)( Int status )
{
#if defined(VGO_linux)
(void)VG_(do_syscall1)(__NR_exit_group, status );
#elif defined(VGO_darwin)
(void)VG_(do_syscall1)(__NR_exit, status );
#else
# error Unknown OS
#endif
/*NOTREACHED*/
// We really shouldn't reach here. Just in case we do, use some very crude
// methods to force abort
__builtin_trap();
*(volatile Int*)0 = 'x';
}
/* Pull down the entire world */
void VG_(exit)( Int status )
{
exit_wrk (status, True);
}
/* Pull down the entire world */
void VG_(client_exit)( Int status )
{
exit_wrk (status, False);
}
// Print the scheduler status.
static void show_sched_status_wrk ( Bool host_stacktrace,
Bool stack_usage,
Bool exited_threads,
const UnwindStartRegs* startRegsIN)
{
Int i;
if (host_stacktrace) {
const Bool save_clo_xml = VG_(clo_xml);
Addr stacktop;
Addr ips[BACKTRACE_DEPTH];
Int n_ips;
ThreadState *tst
= VG_(get_ThreadState)( VG_(lwpid_to_vgtid)( VG_(gettid)() ) );
// If necessary, fake up an ExeContext which is of our actual real CPU
// state. Could cause problems if we got the panic/exception within the
// execontext/stack dump/symtab code. But it's better than nothing.
UnwindStartRegs startRegs;
VG_(memset)(&startRegs, 0, sizeof(startRegs));
if (startRegsIN == NULL) {
GET_STARTREGS(&startRegs);
} else {
startRegs = *startRegsIN;
}
stacktop = tst->os_state.valgrind_stack_init_SP;
n_ips =
VG_(get_StackTrace_wrk)(
0/*tid is unknown*/,
ips, BACKTRACE_DEPTH,
NULL/*array to dump SP values in*/,
NULL/*array to dump FP values in*/,
&startRegs, stacktop
);
VG_(printf)("\nhost stacktrace:\n");
VG_(clo_xml) = False;
VG_(pp_StackTrace) (ips, n_ips);
VG_(clo_xml) = save_clo_xml;
}
VG_(printf)("\nsched status:\n");
VG_(printf)(" running_tid=%d\n", VG_(get_running_tid)());
for (i = 1; i < VG_N_THREADS; i++) {
VgStack* stack
= (VgStack*)VG_(threads)[i].os_state.valgrind_stack_base;
/* If a thread slot was never used (yet), valgrind_stack_base is 0.
If a thread slot is used by a thread or was used by a thread which
has exited, then valgrind_stack_base points to the stack base. */
if (VG_(threads)[i].status == VgTs_Empty
&& (!exited_threads || stack == 0)) continue;
VG_(printf)("\nThread %d: status = %s (lwpid %d)\n", i,
VG_(name_of_ThreadStatus)(VG_(threads)[i].status),
VG_(threads)[i].os_state.lwpid);
if (VG_(threads)[i].status != VgTs_Empty)
VG_(get_and_pp_StackTrace)( i, BACKTRACE_DEPTH );
if (stack_usage && VG_(threads)[i].client_stack_highest_byte != 0 ) {
Addr start, end;
start = end = 0;
VG_(stack_limits)(VG_(threads)[i].client_stack_highest_byte,
&start, &end);
if (start != end)
VG_(printf)("client stack range: [%p %p] client SP: %p\n",
(void*)start, (void*)end, (void*)VG_(get_SP)(i));
else
VG_(printf)("client stack range: ???????\n");
}
if (stack_usage && stack != 0)
VG_(printf)("valgrind stack top usage: %ld of %ld\n",
VG_(clo_valgrind_stacksize)
- VG_(am_get_VgStack_unused_szB)
(stack, VG_(clo_valgrind_stacksize)),
(SizeT) VG_(clo_valgrind_stacksize));
}
VG_(printf)("\n");
}
void VG_(show_sched_status) ( Bool host_stacktrace,
Bool stack_usage,
Bool exited_threads)
{
show_sched_status_wrk (host_stacktrace,
stack_usage,
exited_threads,
NULL);
}
__attribute__ ((noreturn))
static void report_and_quit ( const HChar* report,
const UnwindStartRegs* startRegsIN )
{
show_sched_status_wrk (True, // host_stacktrace
False, // stack_usage
False, // exited_threads
startRegsIN);
VG_(printf)(
"\n"
"Note: see also the FAQ in the source distribution.\n"
"It contains workarounds to several common problems.\n"
"In particular, if Valgrind aborted or crashed after\n"
"identifying problems in your program, there's a good chance\n"
"that fixing those problems will prevent Valgrind aborting or\n"
"crashing, especially if it happened in m_mallocfree.c.\n"
"\n"
"If that doesn't help, please report this bug to: %s\n\n"
"In the bug report, send all the above text, the valgrind\n"
"version, and what OS and version you are using. Thanks.\n\n",
report);
VG_(exit)(1);
}
void VG_(assert_fail) ( Bool isCore, const HChar* expr, const HChar* file,
Int line, const HChar* fn, const HChar* format, ... )
{
va_list vargs, vargs_copy;
const HChar* component;
const HChar* bugs_to;
UInt written;
static Bool entered = False;
if (entered)
VG_(exit)(2);
entered = True;
if (isCore) {
component = "valgrind";
bugs_to = VG_BUGS_TO;
} else {
component = VG_(details).name;
bugs_to = VG_(details).bug_reports_to;
}
if (VG_(clo_xml))
VG_(printf_xml)("</valgrindoutput>\n");
// Treat vg_assert2(0, "foo") specially, as a panicky abort
if (VG_STREQ(expr, "0")) {
VG_(printf)("\n%s: %s:%d (%s): the 'impossible' happened.\n",
component, file, line, fn );
} else {
VG_(printf)("\n%s: %s:%d (%s): Assertion '%s' failed.\n",
component, file, line, fn, expr );
}
/* Check whether anything will be written */
HChar buf[5];
va_start(vargs, format);
va_copy(vargs_copy, vargs);
written = VG_(vsnprintf) ( buf, sizeof(buf), format, vargs );
va_end(vargs);
if (written > 0) {
VG_(printf)("%s: ", component);
VG_(vprintf)(format, vargs_copy);
VG_(printf)("\n");
}
report_and_quit(bugs_to, NULL);
}
__attribute__ ((noreturn))
static void panic ( const HChar* name, const HChar* report, const HChar* str,
const UnwindStartRegs* startRegs )
{
if (VG_(clo_xml))
VG_(printf_xml)("</valgrindoutput>\n");
VG_(printf)("\n%s: the 'impossible' happened:\n %s\n", name, str);
report_and_quit(report, startRegs);
}
void VG_(core_panic_at) ( const HChar* str, const UnwindStartRegs* startRegs )
{
panic("valgrind", VG_BUGS_TO, str, startRegs);
}
void VG_(core_panic) ( const HChar* str )
{
VG_(core_panic_at)(str, NULL);
}
void VG_(tool_panic) ( const HChar* str )
{
panic(VG_(details).name, VG_(details).bug_reports_to, str, NULL);
}
/* Print some helpful-ish text about unimplemented things, and give up. */
void VG_(unimplemented) ( const HChar* msg )
{
if (VG_(clo_xml))
VG_(printf_xml)("</valgrindoutput>\n");
VG_(umsg)("\n");
VG_(umsg)("Valgrind detected that your program requires\n");
VG_(umsg)("the following unimplemented functionality:\n");
VG_(umsg)(" %s\n", msg);
VG_(umsg)("This may be because the functionality is hard to implement,\n");
VG_(umsg)("or because no reasonable program would behave this way,\n");
VG_(umsg)("or because nobody has yet needed it. "
"In any case, let us know at\n");
VG_(umsg)("%s and/or try to work around the problem, if you can.\n",
VG_BUGS_TO);
VG_(umsg)("\n");
VG_(umsg)("Valgrind has to exit now. Sorry. Bye!\n");
VG_(umsg)("\n");
VG_(show_sched_status)(False, // host_stacktrace
False, // stack_usage
False); // exited_threads
VG_(exit)(1);
}
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/