/* EXPORTED */
void VG_(sigframe_create)( ThreadId tid,
Bool on_altstack,
Addr sp_top_of_frame,
const vki_siginfo_t *siginfo,
const struct vki_ucontext *siguc,
void *handler,
UInt flags,
const vki_sigset_t *mask,
void *restorer )
{
ThreadState *tst;
Addr sp = sp_top_of_frame;
Int sigNo = siginfo->si_signo;
UInt size;
tst = VG_(get_ThreadState)(tid);
size = sizeof(struct rt_sigframe);
sp -= size;
sp = VG_ROUNDDN(sp, 16);
if (! ML_(sf_maybe_extend_stack)(tst, sp, size, flags))
return; // Give up. No idea if this is correct
struct rt_sigframe *rsf = (struct rt_sigframe *)sp;
/* Track our writes to siginfo */
VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, /* VVVVV */
"signal handler siginfo", (Addr)rsf,
offsetof(struct rt_sigframe, sig));
VG_(memcpy)(&rsf->info, siginfo, sizeof(vki_siginfo_t));
if (sigNo == VKI_SIGILL && siginfo->si_code > 0) {
rsf->info._sifields._sigfault._addr
= (Addr*)(tst)->arch.vex.guest_PC;
}
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid, /* ^^^^^ */
(Addr)rsf, offsetof(struct rt_sigframe, sig));
build_sigframe(tst, &rsf->sig, siginfo, siguc,
handler, flags, mask, restorer);
tst->arch.vex.guest_X1 = (Addr)&rsf->info;
tst->arch.vex.guest_X2 = (Addr)&rsf->sig.uc;
VG_(set_SP)(tid, sp);
VG_TRACK( post_reg_write, Vg_CoreSignal, tid, VG_O_STACK_PTR,
sizeof(Addr));
tst->arch.vex.guest_X0 = sigNo;
if (flags & VKI_SA_RESTORER)
tst->arch.vex.guest_X30 = (Addr)restorer;
else
tst->arch.vex.guest_X30
= (Addr)&VG_(arm64_linux_SUBST_FOR_rt_sigreturn);
tst->arch.vex.guest_PC = (Addr)handler;
}
// Scan a block of memory between [start, start+len). This range may
// be bogus, inaccessable, or otherwise strange; we deal with it. For each
// valid aligned word we assume it's a pointer to a chunk a push the chunk
// onto the mark stack if so.
static void
lc_scan_memory(Addr start, SizeT len, Bool is_prior_definite, Int clique)
{
Addr ptr = VG_ROUNDUP(start, sizeof(Addr));
Addr end = VG_ROUNDDN(start+len, sizeof(Addr));
vki_sigset_t sigmask;
if (VG_DEBUG_LEAKCHECK)
VG_(printf)("scan %#lx-%#lx (%lu)\n", start, end, len);
VG_(sigprocmask)(VKI_SIG_SETMASK, NULL, &sigmask);
VG_(set_fault_catcher)(scan_all_valid_memory_catcher);
// We might be in the middle of a page. Do a cheap check to see if
// it's valid; if not, skip onto the next page.
if (!VG_(am_is_valid_for_client)(ptr, sizeof(Addr), VKI_PROT_READ))
ptr = VG_PGROUNDUP(ptr+1); // First page is bad - skip it.
while (ptr < end) {
Addr addr;
// Skip invalid chunks.
if ( ! MC_(is_within_valid_secondary)(ptr) ) {
ptr = VG_ROUNDUP(ptr+1, SM_SIZE);
continue;
}
// Look to see if this page seems reasonable.
if ((ptr % VKI_PAGE_SIZE) == 0) {
if (!VG_(am_is_valid_for_client)(ptr, sizeof(Addr), VKI_PROT_READ)) {
ptr += VKI_PAGE_SIZE; // Bad page - skip it.
continue;
}
}
if (__builtin_setjmp(memscan_jmpbuf) == 0) {
if ( MC_(is_valid_aligned_word)(ptr) ) {
lc_scanned_szB += sizeof(Addr);
addr = *(Addr *)ptr;
// If we get here, the scanned word is in valid memory. Now
// let's see if its contents point to a chunk.
lc_push_if_a_chunk_ptr(addr, clique, is_prior_definite);
} else if (0 && VG_DEBUG_LEAKCHECK) {
VG_(printf)("%#lx not valid\n", ptr);
}
ptr += sizeof(Addr);
} else {
// We need to restore the signal mask, because we were
// longjmped out of a signal handler.
VG_(sigprocmask)(VKI_SIG_SETMASK, &sigmask, NULL);
ptr = VG_PGROUNDUP(ptr+1); // Bad page - skip it.
}
}
VG_(sigprocmask)(VKI_SIG_SETMASK, &sigmask, NULL);
VG_(set_fault_catcher)(NULL);
}
static Addr build_sigframe(ThreadState *tst,
Addr esp_top_of_frame,
const vki_siginfo_t *siginfo,
const struct vki_ucontext *siguc,
UInt flags,
const vki_sigset_t *mask,
void *restorer)
{
struct sigframe *frame;
Addr esp = esp_top_of_frame;
Int sigNo = siginfo->si_signo;
UWord trapno;
UWord err;
struct vki_ucontext uc;
vg_assert((flags & VKI_SA_SIGINFO) == 0);
esp -= sizeof(*frame);
esp = VG_ROUNDDN(esp, 16);
frame = (struct sigframe *)esp;
if (!extend(tst, esp, sizeof(*frame)))
return esp_top_of_frame;
/* retaddr, sigNo, siguContext fields are to be written */
VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, "signal handler frame",
esp, offsetof(struct sigframe, vg) );
frame->sigNo = sigNo;
if (flags & VKI_SA_RESTORER)
frame->retaddr = (Addr)restorer;
else
frame->retaddr = (Addr)&VG_(x86_linux_SUBST_FOR_sigreturn);
if (siguc) {
trapno = siguc->uc_mcontext.trapno;
err = siguc->uc_mcontext.err;
} else {
trapno = 0;
err = 0;
}
synth_ucontext(tst->tid, siginfo, trapno, err, mask, &uc, &frame->fpstate);
VG_(memcpy)(&frame->sigContext, &uc.uc_mcontext,
sizeof(struct vki_sigcontext));
frame->sigContext.oldmask = mask->sig[0];
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid,
esp, offsetof(struct sigframe, vg) );
build_vg_sigframe(&frame->vg, tst, flags, sigNo);
return esp;
}
static Addr build_rt_sigframe(ThreadState *tst,
Addr rsp_top_of_frame,
const vki_siginfo_t *siginfo,
const struct vki_ucontext *siguc,
void *handler, UInt flags,
const vki_sigset_t *mask,
void *restorer)
{
struct rt_sigframe *frame;
Addr rsp = rsp_top_of_frame;
Int sigNo = siginfo->si_signo;
UWord trapno;
UWord err;
rsp -= sizeof(*frame);
rsp = VG_ROUNDDN(rsp, 16) - 8;
frame = (struct rt_sigframe *)rsp;
if (!extend(tst, rsp, sizeof(*frame)))
return rsp_top_of_frame;
/* retaddr, siginfo, uContext fields are to be written */
VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, "rt signal handler frame",
rsp, offsetof(struct rt_sigframe, vg) );
if (flags & VKI_SA_RESTORER)
frame->retaddr = (Addr)restorer;
else
frame->retaddr = (Addr)&VG_(amd64_linux_SUBST_FOR_rt_sigreturn);
if (siguc) {
trapno = siguc->uc_mcontext.trapno;
err = siguc->uc_mcontext.err;
} else {
trapno = 0;
err = 0;
}
VG_(memcpy)(&frame->sigInfo, siginfo, sizeof(vki_siginfo_t));
/* SIGILL defines addr to be the faulting address */
if (sigNo == VKI_SIGILL && siginfo->si_code > 0)
frame->sigInfo._sifields._sigfault._addr
= (void*)tst->arch.vex.guest_RIP;
synth_ucontext(tst->tid, siginfo, trapno, err, mask,
&frame->uContext, &frame->fpstate);
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid,
rsp, offsetof(struct rt_sigframe, vg) );
build_vg_sigframe(&frame->vg, tst, mask, flags, sigNo);
return rsp;
}
static Addr build_sigframe(ThreadState *tst,
Addr rsp_top_of_frame,
const vki_siginfo_t *siginfo,
const struct vki_ucontext *siguc,
void *handler, UInt flags,
const vki_sigset_t *mask,
void *restorer)
{
struct sigframe *frame;
Addr rsp = rsp_top_of_frame;
Int sigNo = siginfo->si_signo;
UWord trapno;
UWord err;
rsp -= sizeof(*frame);
rsp = VG_ROUNDDN(rsp, 16);
frame = (struct sigframe *)rsp;
if (!extend(tst, rsp, sizeof(*frame)))
return rsp_top_of_frame;
/* retaddr, siginfo, uContext fields are to be written */
VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, "signal handler frame",
rsp, offsetof(struct sigframe, vg) );
frame->sigNo = sigNo;
frame->retaddr = (Addr)&VG_(amd64_freebsd_SUBST_FOR_sigreturn);
if ((flags & VKI_SA_SIGINFO) == 0)
frame->psigInfo = (Addr)siginfo->si_code;
else
frame->psigInfo = (Addr)&frame->sigInfo;
VG_(memcpy)(&frame->sigInfo, siginfo, sizeof(vki_siginfo_t));
if (siguc != NULL) {
trapno = siguc->uc_mcontext.trapno;
err = siguc->uc_mcontext.err;
} else {
trapno = 0;
err = 0;
}
synth_ucontext(tst->tid, siginfo, trapno, err, mask,
&frame->uContext, &frame->fpstate);
if (sigNo == VKI_SIGILL && siginfo->si_code > 0)
frame->sigInfo.si_addr = (void*)tst->arch.vex.guest_RIP;
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid,
rsp, offsetof(struct sigframe, vg) );
build_vg_sigframe(&frame->vg, tst, mask, flags, sigNo);
return rsp;
}
/* Scan a block of memory between [start, start+len). This range may
be bogus, inaccessable, or otherwise strange; we deal with it.
If clique != -1, it means we're gathering leaked memory into
cliques, and clique is the index of the current clique leader. */
static void _lc_scan_memory(Addr start, SizeT len, Int clique)
{
Addr ptr = VG_ROUNDUP(start, sizeof(Addr));
Addr end = VG_ROUNDDN(start+len, sizeof(Addr));
vki_sigset_t sigmask;
if (VG_DEBUG_LEAKCHECK)
VG_(printf)("scan %p-%p\n", start, start+len);
VG_(sigprocmask)(VKI_SIG_SETMASK, NULL, &sigmask);
VG_(set_fault_catcher)(scan_all_valid_memory_catcher);
lc_scanned += end-ptr;
if (!VG_(is_client_addr)(ptr) ||
!VG_(is_addressable)(ptr, sizeof(Addr), VKI_PROT_READ))
ptr = VG_PGROUNDUP(ptr+1); /* first page bad */
while (ptr < end) {
Addr addr;
/* Skip invalid chunks */
if (!(*lc_is_within_valid_secondary)(ptr)) {
ptr = VG_ROUNDUP(ptr+1, SECONDARY_SIZE);
continue;
}
/* Look to see if this page seems reasonble */
if ((ptr % VKI_PAGE_SIZE) == 0) {
if (!VG_(is_client_addr)(ptr) ||
!VG_(is_addressable)(ptr, sizeof(Addr), VKI_PROT_READ))
ptr += VKI_PAGE_SIZE; /* bad page - skip it */
}
if (__builtin_setjmp(memscan_jmpbuf) == 0) {
if ((*lc_is_valid_aligned_word)(ptr)) {
addr = *(Addr *)ptr;
_lc_markstack_push(addr, clique);
} else if (0 && VG_DEBUG_LEAKCHECK)
VG_(printf)("%p not valid\n", ptr);
ptr += sizeof(Addr);
} else {
/* We need to restore the signal mask, because we were
longjmped out of a signal handler. */
VG_(sigprocmask)(VKI_SIG_SETMASK, &sigmask, NULL);
ptr = VG_PGROUNDUP(ptr+1); /* bad page - skip it */
}
}
VG_(sigprocmask)(VKI_SIG_SETMASK, &sigmask, NULL);
VG_(set_fault_catcher)(NULL);
}
/* EXPORTED */
void VG_(sigframe_create)( ThreadId tid,
Addr sp_top_of_frame,
const vki_siginfo_t *siginfo,
const struct vki_ucontext *siguc,
void *handler,
UInt flags,
const vki_sigset_t *mask,
void *restorer )
{
// struct vg_sig_private *priv;
Addr sp = sp_top_of_frame;
ThreadState *tst;
Int sigNo = siginfo->si_signo;
// Addr faultaddr;
UInt size;
tst = VG_(get_ThreadState)(tid);
size = flags & VKI_SA_SIGINFO ? sizeof(struct rt_sigframe) :
sizeof(struct sigframe);
sp -= size;
sp = VG_ROUNDDN(sp, 16);
if(!extend(tst, sp, size))
I_die_here; // XXX Incorrect behavior
if (flags & VKI_SA_SIGINFO){
struct rt_sigframe *rsf = (struct rt_sigframe *)sp;
/* Track our writes to siginfo */
VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, /* VVVVV */
"signal handler siginfo", (Addr)rsf,
offsetof(struct rt_sigframe, sig));
VG_(memcpy)(&rsf->info, siginfo, sizeof(vki_siginfo_t));
if(sigNo == VKI_SIGILL && siginfo->si_code > 0) {
rsf->info._sifields._sigfault._addr = (Addr *) (tst)->arch.vex.guest_R12; /* IP */
}
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid, /* ^^^^^ */
(Addr)rsf, offsetof(struct rt_sigframe, sig));
build_sigframe(tst, &rsf->sig, siginfo, siguc,
handler, flags, mask, restorer);
tst->arch.vex.guest_R1 = (Addr)&rsf->info;
tst->arch.vex.guest_R2 = (Addr)&rsf->sig.uc;
}
else {
static void describe_many(void)
{
const int pagesize = guess_pagesize();
describe ("discovered address giving SEGV in thread stack",
(void*)lowest_j);
describe ("byte just above highest guardpage byte",
(void*) VG_ROUNDUP(lowest_j, pagesize));
describe ("highest guardpage byte",
(void*) VG_ROUNDUP(lowest_j, pagesize)-1);
describe ("lowest guardpage byte",
(void*) VG_ROUNDDN(lowest_j, pagesize));
/* Cannot test the next byte, as we cannot predict how
this byte will be described. */
}
static Addr build_rt_sigframe(ThreadState *tst,
Addr esp_top_of_frame,
const vki_siginfo_t *siginfo,
void *handler, UInt flags,
const vki_sigset_t *mask,
void *restorer)
{
struct rt_sigframe *frame;
Addr esp = esp_top_of_frame;
Int sigNo = siginfo->si_signo;
vg_assert((flags & VKI_SA_SIGINFO) != 0);
esp -= sizeof(*frame);
esp = VG_ROUNDDN(esp, 16);
frame = (struct rt_sigframe *)esp;
if (!extend(tst, esp, sizeof(*frame)))
return esp_top_of_frame;
/* retaddr, sigNo, pSiginfo, puContext fields are to be written */
VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, "rt signal handler frame",
esp, offsetof(struct rt_sigframe, vg) );
frame->sigNo = sigNo;
if (flags & VKI_SA_RESTORER)
frame->retaddr = (Addr)restorer;
else
frame->retaddr
= VG_(client_trampoline_code)+VG_(tramp_rt_sigreturn_offset);
frame->psigInfo = (Addr)&frame->sigInfo;
frame->puContext = (Addr)&frame->uContext;
VG_(memcpy)(&frame->sigInfo, siginfo, sizeof(vki_siginfo_t));
/* SIGILL defines addr to be the faulting address */
if (sigNo == VKI_SIGILL && siginfo->si_code > 0)
frame->sigInfo._sifields._sigfault._addr
= (void*)tst->arch.vex.guest_EIP;
synth_ucontext(tst->tid, siginfo, mask, &frame->uContext, &frame->fpstate);
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid,
esp, offsetof(struct rt_sigframe, vg) );
build_vg_sigframe(&frame->vg, tst, mask, flags, sigNo);
return esp;
}
static Addr build_sigframe(ThreadState *tst,
Addr esp_top_of_frame,
const vki_siginfo_t *siginfo,
void *handler, UInt flags,
const vki_sigset_t *mask,
void *restorer)
{
struct sigframe *frame;
Addr esp = esp_top_of_frame;
Int sigNo = siginfo->si_signo;
struct vki_ucontext uc;
vg_assert((flags & VKI_SA_SIGINFO) == 0);
esp -= sizeof(*frame);
esp = VG_ROUNDDN(esp, 16);
frame = (struct sigframe *)esp;
if (!extend(tst, esp, sizeof(*frame)))
return esp_top_of_frame;
/* retaddr, sigNo, siguContext fields are to be written */
VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, "signal handler frame",
esp, offsetof(struct sigframe, vg) );
frame->sigNo = sigNo;
if (flags & VKI_SA_RESTORER)
frame->retaddr = (Addr)restorer;
else
frame->retaddr
= VG_(client_trampoline_code)+VG_(tramp_sigreturn_offset);
synth_ucontext(tst->tid, siginfo, mask, &uc, &frame->fpstate);
VG_(memcpy)(&frame->sigContext, &uc.uc_mcontext,
sizeof(struct vki_sigcontext));
frame->sigContext.oldmask = mask->sig[0];
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid,
esp, offsetof(struct sigframe, vg) );
build_vg_sigframe(&frame->vg, tst, mask, flags, sigNo);
return esp;
}
static void* child_fn_0 ( void* arg )
{
grow_the_stack();
bad_things_below_sp();
if (setjmp(goback)) {
describe_many();
} else
bad_things_till_guard_page();
if (shake_with_wrong_registration) {
// Do whatever stupid things we could imagine
// with stack registration and see no explosion happens
// Note: this is executed only if an arg is given to the program.
//
const int pgsz = guess_pagesize();
int stackid;
fprintf(stderr, "\n\nShaking after unregistering stack\n");
// Assuming our first stack was automatically registered as nr 1
VALGRIND_STACK_DEREGISTER(1);
// Test with no stack registered
describe_many();
fprintf(stderr, "\n\nShaking with small stack\n");
stackid = VALGRIND_STACK_REGISTER((void*) VG_ROUNDDN(&stackid, pgsz),
(void*) VG_ROUNDUP(&stackid, pgsz));
describe_many();
VALGRIND_STACK_DEREGISTER(stackid);
fprintf(stderr, "\n\nShaking with huge stack\n");
stackid = VALGRIND_STACK_REGISTER((void*) 0x0,
(void*) VG_ROUNDUP(&stackid, 2<<20));
describe_many();
VALGRIND_STACK_DEREGISTER(stackid);
}
return NULL;
}
void test_VG_ROUND_et_al()
{
CHECK( 0 == VG_ROUNDDN(0, 1) );
CHECK( 1 == VG_ROUNDDN(1, 1) );
CHECK( 2 == VG_ROUNDDN(2, 1) );
CHECK( 3 == VG_ROUNDDN(3, 1) );
CHECK( 4 == VG_ROUNDDN(4, 1) );
CHECK( 5 == VG_ROUNDDN(5, 1) );
CHECK( 6 == VG_ROUNDDN(6, 1) );
CHECK( 7 == VG_ROUNDDN(7, 1) );
CHECK( 0 == VG_ROUNDUP(0, 1) );
CHECK( 1 == VG_ROUNDUP(1, 1) );
CHECK( 2 == VG_ROUNDUP(2, 1) );
CHECK( 3 == VG_ROUNDUP(3, 1) );
CHECK( 4 == VG_ROUNDUP(4, 1) );
CHECK( 5 == VG_ROUNDUP(5, 1) );
CHECK( 6 == VG_ROUNDUP(6, 1) );
CHECK( 7 == VG_ROUNDUP(7, 1) );
CHECK( 0 == VG_ROUNDDN(0, 2) );
CHECK( 0 == VG_ROUNDDN(1, 2) );
CHECK( 2 == VG_ROUNDDN(2, 2) );
CHECK( 2 == VG_ROUNDDN(3, 2) );
CHECK( 4 == VG_ROUNDDN(4, 2) );
CHECK( 4 == VG_ROUNDDN(5, 2) );
CHECK( 6 == VG_ROUNDDN(6, 2) );
CHECK( 6 == VG_ROUNDDN(7, 2) );
CHECK( 0 == VG_ROUNDUP(0, 2) );
CHECK( 2 == VG_ROUNDUP(1, 2) );
CHECK( 2 == VG_ROUNDUP(2, 2) );
CHECK( 4 == VG_ROUNDUP(3, 2) );
CHECK( 4 == VG_ROUNDUP(4, 2) );
CHECK( 6 == VG_ROUNDUP(5, 2) );
CHECK( 6 == VG_ROUNDUP(6, 2) );
CHECK( 8 == VG_ROUNDUP(7, 2) );
CHECK( 0 == VG_ROUNDDN(0, 4) );
CHECK( 0 == VG_ROUNDDN(1, 4) );
CHECK( 0 == VG_ROUNDDN(2, 4) );
CHECK( 0 == VG_ROUNDDN(3, 4) );
CHECK( 4 == VG_ROUNDDN(4, 4) );
CHECK( 4 == VG_ROUNDDN(5, 4) );
CHECK( 4 == VG_ROUNDDN(6, 4) );
CHECK( 4 == VG_ROUNDDN(7, 4) );
CHECK( 0 == VG_ROUNDUP(0, 4) );
CHECK( 4 == VG_ROUNDUP(1, 4) );
CHECK( 4 == VG_ROUNDUP(2, 4) );
CHECK( 4 == VG_ROUNDUP(3, 4) );
CHECK( 4 == VG_ROUNDUP(4, 4) );
CHECK( 8 == VG_ROUNDUP(5, 4) );
CHECK( 8 == VG_ROUNDUP(6, 4) );
CHECK( 8 == VG_ROUNDUP(7, 4) );
CHECK( 0 == VG_ROUNDDN(0, 8) );
CHECK( 0 == VG_ROUNDDN(1, 8) );
CHECK( 0 == VG_ROUNDDN(2, 8) );
CHECK( 0 == VG_ROUNDDN(3, 8) );
CHECK( 0 == VG_ROUNDDN(4, 8) );
CHECK( 0 == VG_ROUNDDN(5, 8) );
CHECK( 0 == VG_ROUNDDN(6, 8) );
CHECK( 0 == VG_ROUNDDN(7, 8) );
CHECK( 0 == VG_ROUNDUP(0, 8) );
CHECK( 8 == VG_ROUNDUP(1, 8) );
CHECK( 8 == VG_ROUNDUP(2, 8) );
CHECK( 8 == VG_ROUNDUP(3, 8) );
CHECK( 8 == VG_ROUNDUP(4, 8) );
CHECK( 8 == VG_ROUNDUP(5, 8) );
CHECK( 8 == VG_ROUNDUP(6, 8) );
CHECK( 8 == VG_ROUNDUP(7, 8) );
CHECK( 0 == VG_PGROUNDDN(0) );
CHECK( 0 == VG_PGROUNDDN(1) );
CHECK( 0 == VG_PGROUNDDN(2) );
CHECK( 0 == VG_PGROUNDDN(3) );
CHECK( 0 == VG_PGROUNDDN(4) );
CHECK( 0 == VG_PGROUNDDN(VKI_PAGE_SIZE-1) );
CHECK( VKI_PAGE_SIZE == VG_PGROUNDDN(VKI_PAGE_SIZE ) );
CHECK( VKI_PAGE_SIZE == VG_PGROUNDDN(VKI_PAGE_SIZE+1) );
CHECK( 0 == VG_PGROUNDUP(0) );
CHECK( VKI_PAGE_SIZE == VG_PGROUNDUP(1) );
CHECK( VKI_PAGE_SIZE == VG_PGROUNDUP(2) );
CHECK( VKI_PAGE_SIZE == VG_PGROUNDUP(3) );
CHECK( VKI_PAGE_SIZE == VG_PGROUNDUP(4) );
CHECK( VKI_PAGE_SIZE == VG_PGROUNDUP(VKI_PAGE_SIZE-1) );
CHECK( VKI_PAGE_SIZE == VG_PGROUNDUP(VKI_PAGE_SIZE ) );
CHECK( VKI_PAGE_SIZE*2 == VG_PGROUNDUP(VKI_PAGE_SIZE+1) );
}
static Addr build_rt_sigframe(ThreadState *tst,
Addr esp_top_of_frame,
const vki_siginfo_t *siginfo,
const struct vki_ucontext *siguc,
UInt flags,
const vki_sigset_t *mask,
void *restorer)
{
struct rt_sigframe *frame;
Addr esp = esp_top_of_frame;
Int sigNo = siginfo->si_signo;
UWord trapno;
UWord err;
vg_assert((flags & VKI_SA_SIGINFO) != 0);
esp -= sizeof(*frame);
esp = VG_ROUNDDN(esp, 16);
frame = (struct rt_sigframe *)esp;
if (!extend(tst, esp, sizeof(*frame)))
return esp_top_of_frame;
/* retaddr, sigNo, pSiginfo, puContext fields are to be written */
VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, "rt signal handler frame",
esp, offsetof(struct rt_sigframe, vg) );
frame->sigNo = sigNo;
if (flags & VKI_SA_RESTORER)
frame->retaddr = (Addr)restorer;
else
frame->retaddr = (Addr)&VG_(x86_linux_SUBST_FOR_rt_sigreturn);
if (siguc) {
trapno = siguc->uc_mcontext.trapno;
err = siguc->uc_mcontext.err;
} else {
trapno = 0;
err = 0;
}
frame->psigInfo = (Addr)&frame->sigInfo;
frame->puContext = (Addr)&frame->uContext;
VG_(memcpy)(&frame->sigInfo, siginfo, sizeof(vki_siginfo_t));
if (sigNo == VKI_SIGILL && siginfo->si_code > 0)
frame->sigInfo._sifields._sigfault._addr
= (void*)tst->arch.vex.guest_EIP;
synth_ucontext(tst->tid, siginfo, trapno, err, mask,
&frame->uContext, &frame->fpstate);
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid,
esp, offsetof(struct rt_sigframe, vg) );
build_vg_sigframe(&frame->vg, tst, flags, sigNo);
return esp;
}
static
Addr setup_client_stack( void* init_sp,
char** orig_envp,
const ExeInfo* info,
Addr clstack_end,
SizeT clstack_max_size )
{
char **cpp;
char *strtab; /* string table */
char *stringbase;
Addr *ptr;
unsigned stringsize; /* total size of strings in bytes */
unsigned auxsize; /* total size of auxv in bytes */
Int argc; /* total argc */
Int envc; /* total number of env vars */
unsigned stacksize; /* total client stack size */
Addr client_SP; /* client stack base (initial SP) */
Addr clstack_start;
Int i;
Bool have_exename;
vg_assert(VG_IS_PAGE_ALIGNED(clstack_end+1));
vg_assert( VG_(args_for_client) );
/* ==================== compute sizes ==================== */
/* first of all, work out how big the client stack will be */
stringsize = 0;
auxsize = 0;
have_exename = VG_(args_the_exename) != NULL;
/* paste on the extra args if the loader needs them (ie, the #!
interpreter and its argument) */
argc = 0;
if (info->interp_name != NULL) {
argc++;
stringsize += VG_(strlen)(info->interp_name) + 1;
}
if (info->interp_args != NULL) {
argc++;
stringsize += VG_(strlen)(info->interp_args) + 1;
}
/* now scan the args we're given... */
if (have_exename)
stringsize += VG_(strlen)( VG_(args_the_exename) ) + 1;
for (i = 0; i < VG_(sizeXA)( VG_(args_for_client) ); i++) {
argc++;
stringsize += VG_(strlen)( * (HChar**)
VG_(indexXA)( VG_(args_for_client), i ))
+ 1;
}
/* ...and the environment */
envc = 0;
for (cpp = orig_envp; cpp && *cpp; cpp++) {
envc++;
stringsize += VG_(strlen)(*cpp) + 1;
}
/* Darwin executable_path + NULL */
auxsize += 2 * sizeof(Word);
if (info->executable_path) {
stringsize += 1 + VG_(strlen)(info->executable_path);
}
/* Darwin mach_header */
if (info->dynamic) auxsize += sizeof(Word);
/* OK, now we know how big the client stack is */
stacksize =
sizeof(Word) + /* argc */
(have_exename ? sizeof(char **) : 0) + /* argc[0] == exename */
sizeof(char **)*argc + /* argv */
sizeof(char **) + /* terminal NULL */
sizeof(char **)*envc + /* envp */
sizeof(char **) + /* terminal NULL */
auxsize + /* auxv */
VG_ROUNDUP(stringsize, sizeof(Word)); /* strings (aligned) */
if (0) VG_(printf)("stacksize = %d\n", stacksize);
/* client_SP is the client's stack pointer */
client_SP = clstack_end - stacksize;
client_SP = VG_ROUNDDN(client_SP, 32); /* make stack 32 byte aligned */
/* base of the string table (aligned) */
stringbase = strtab = (char *)clstack_end
- VG_ROUNDUP(stringsize, sizeof(int));
/* The max stack size */
clstack_max_size = VG_PGROUNDUP(clstack_max_size);
/* Darwin stack is chosen by the ume loader */
clstack_start = clstack_end - clstack_max_size;
/* Record stack extent -- needed for stack-change code. */
/* GrP fixme really? */
VG_(clstk_base) = clstack_start;
VG_(clstk_end) = clstack_end;
if (0)
VG_(printf)("stringsize=%d auxsize=%d stacksize=%d maxsize=0x%x\n"
"clstack_start %p\n"
"clstack_end %p\n",
stringsize, auxsize, stacksize, (Int)clstack_max_size,
(void*)clstack_start, (void*)clstack_end);
/* ==================== allocate space ==================== */
/* Stack was allocated by the ume loader. */
/* ==================== create client stack ==================== */
ptr = (Addr*)client_SP;
/* --- mach_header --- */
if (info->dynamic) *ptr++ = info->text;
/* --- client argc --- */
*ptr++ = (Addr)(argc + (have_exename ? 1 : 0));
/* --- client argv --- */
if (info->interp_name) {
*ptr++ = (Addr)copy_str(&strtab, info->interp_name);
VG_(free)(info->interp_name);
}
if (info->interp_args) {
*ptr++ = (Addr)copy_str(&strtab, info->interp_args);
VG_(free)(info->interp_args);
}
if (have_exename)
*ptr++ = (Addr)copy_str(&strtab, VG_(args_the_exename));
for (i = 0; i < VG_(sizeXA)( VG_(args_for_client) ); i++) {
*ptr++ = (Addr)copy_str(
&strtab,
* (HChar**) VG_(indexXA)( VG_(args_for_client), i )
);
}
*ptr++ = 0;
/* --- envp --- */
VG_(client_envp) = (Char **)ptr;
for (cpp = orig_envp; cpp && *cpp; ptr++, cpp++)
*ptr = (Addr)copy_str(&strtab, *cpp);
*ptr++ = 0;
/* --- executable_path + NULL --- */
if (info->executable_path)
*ptr++ = (Addr)copy_str(&strtab, info->executable_path);
else
*ptr++ = 0;
*ptr++ = 0;
vg_assert((strtab-stringbase) == stringsize);
/* client_SP is pointing at client's argc/argv */
if (0) VG_(printf)("startup SP = %#lx\n", client_SP);
return client_SP;
}
static void main2(void)
{
int err, padfile;
struct exeinfo info;
extern char _end;
int *esp;
char buf[strlen(valgrind_lib) + sizeof(stage2) + 16];
info.exe_end = VG_PGROUNDDN(init_sp); // rounding down
info.exe_base = KICKSTART_BASE;
printf("info.exe_end = %p\n", info.exe_end);
#ifdef HAVE_PIE
info.exe_base = VG_ROUNDDN(info.exe_end - 0x02000000, 0x10000000);
assert(info.exe_base >= VG_PGROUNDUP(&_end));
info.map_base = info.exe_base + 0x01000000 ;
#else
// If this system doesn't have PIE (position-independent executables),
// we have to choose a hardwired location for stage2.
// info.exe_base = VG_PGROUNDUP(&_end);
printf("info.exe_base = %p\n", info.exe_base);
info.map_base = KICKSTART_BASE + 0x01000000 ;
printf("info.map_base = %p\n", info.map_base);
#endif
info.argv = NULL;
snprintf(buf, sizeof(buf), "%s/%s", valgrind_lib, stage2);
printf("valgrind_lib = %s\n",valgrind_lib);
err = do_exec(buf, &info);
if (err != 0) {
fprintf(stderr, "valgrind: failed to load %s: %s\n",
buf, strerror(err));
exit(1);
}
/* Make sure stage2's dynamic linker can't tromp on the lower part
of the address space. */
padfile = as_openpadfile();
as_pad(0, (void *)info.map_base, padfile); // map base is the start of our stuff
printf("init sp : %x\n", init_sp);
esp = fix_auxv(init_sp, &info, padfile);
printf("after fix_auxb\n");
if (1) {
printf("---------- launch stage 2 ----------\n");
printf("eip=%p esp=%p\n", (void *)info.init_eip, esp);
foreach_map(prmap, /*dummy*/NULL);
}
VG_(debugLog)(1, "stage1", "main2(): starting stage2\n");
printf("jumping to stage 2 \n");
printf("esp : %x \n eip : %x\n",esp, info.init_eip);
jump_and_switch_stacks(
(Addr) esp, /* stack */
(Addr) info.init_eip /* Where to jump */
);
/*NOTREACHED*/
assert(0);
}