static
void stack_mcontext ( struct vki_mcontext *mc,
ThreadState* tst,
Bool use_rt_sigreturn,
UInt fault_addr )
{
VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, "signal frame mcontext",
(Addr)mc, sizeof(struct vki_pt_regs) );
# define DO(gpr) mc->mc_gregs[VKI_PT_R0+gpr] = tst->arch.vex.guest_GPR##gpr
DO(0); DO(1); DO(2); DO(3); DO(4); DO(5); DO(6); DO(7);
DO(8); DO(9); DO(10); DO(11); DO(12); DO(13); DO(14); DO(15);
DO(16); DO(17); DO(18); DO(19); DO(20); DO(21); DO(22); DO(23);
DO(24); DO(25); DO(26); DO(27); DO(28); DO(29); DO(30); DO(31);
# undef DO
mc->mc_gregs[VKI_PT_NIP] = tst->arch.vex.guest_CIA;
mc->mc_gregs[VKI_PT_MSR] = 0xf032; /* pretty arbitrary */
mc->mc_gregs[VKI_PT_ORIG_R3] = tst->arch.vex.guest_GPR3;
mc->mc_gregs[VKI_PT_CTR] = tst->arch.vex.guest_CTR;
mc->mc_gregs[VKI_PT_LNK] = tst->arch.vex.guest_LR;
mc->mc_gregs[VKI_PT_XER] = LibVEX_GuestPPC32_get_XER(&tst->arch.vex);
mc->mc_gregs[VKI_PT_CCR] = LibVEX_GuestPPC32_get_CR(&tst->arch.vex);
mc->mc_gregs[VKI_PT_MQ] = 0;
mc->mc_gregs[VKI_PT_TRAP] = 0;
mc->mc_gregs[VKI_PT_DAR] = fault_addr;
mc->mc_gregs[VKI_PT_DSISR] = 0;
mc->mc_gregs[VKI_PT_RESULT] = 0;
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid,
(Addr)mc, sizeof(struct vki_pt_regs) );
/* XXX should do FP and vector regs */
/* set up signal return trampoline */
/* NB. 5 Sept 07. mc->mc_pad[0..1] used to contain a the code to
which the signal handler returns, and it just did sys_sigreturn
or sys_rt_sigreturn. But this doesn't work if the stack is
non-executable, and it isn't consistent with the x86-linux and
amd64-linux scheme for removing the stack frame. So instead be
consistent and use a stub in m_trampoline. Then it doesn't
matter whether or not the (guest) stack is executable. This
fixes #149519 and #145837. */
VG_TRACK(pre_mem_write, Vg_CoreSignal, tst->tid, "signal frame mcontext",
(Addr)&mc->mc_pad, sizeof(mc->mc_pad));
mc->mc_pad[0] = 0; /* invalid */
mc->mc_pad[1] = 0; /* invalid */
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid,
(Addr)&mc->mc_pad, sizeof(mc->mc_pad) );
/* invalidate any translation of this area */
VG_(discard_translations)( (Addr)&mc->mc_pad,
sizeof(mc->mc_pad), "stack_mcontext" );
/* set the signal handler to return to the trampoline */
SET_SIGNAL_LR(tst, (Addr)(use_rt_sigreturn
? (Addr)&VG_(ppc32_linux_SUBST_FOR_rt_sigreturn)
: (Addr)&VG_(ppc32_linux_SUBST_FOR_sigreturn)
));
}
static
void stack_mcontext ( struct vki_mcontext *mc,
ThreadState* tst,
Int ret,
UInt fault_addr )
{
VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, "signal frame mcontext",
(Addr)mc, sizeof(struct vki_pt_regs) );
# define DO(gpr) mc->mc_gregs[VKI_PT_R0+gpr] = tst->arch.vex.guest_GPR##gpr
DO(0); DO(1); DO(2); DO(3); DO(4); DO(5); DO(6); DO(7);
DO(8); DO(9); DO(10); DO(11); DO(12); DO(13); DO(14); DO(15);
DO(16); DO(17); DO(18); DO(19); DO(20); DO(21); DO(22); DO(23);
DO(24); DO(25); DO(26); DO(27); DO(28); DO(29); DO(30); DO(31);
# undef DO
mc->mc_gregs[VKI_PT_NIP] = tst->arch.vex.guest_CIA;
mc->mc_gregs[VKI_PT_MSR] = 0xf032; /* pretty arbitrary */
mc->mc_gregs[VKI_PT_ORIG_R3] = tst->arch.vex.guest_GPR3;
mc->mc_gregs[VKI_PT_CTR] = tst->arch.vex.guest_CTR;
mc->mc_gregs[VKI_PT_LNK] = tst->arch.vex.guest_LR;
mc->mc_gregs[VKI_PT_XER] = LibVEX_GuestPPC32_get_XER(&tst->arch.vex);
mc->mc_gregs[VKI_PT_CCR] = LibVEX_GuestPPC32_get_CR(&tst->arch.vex);
mc->mc_gregs[VKI_PT_MQ] = 0;
mc->mc_gregs[VKI_PT_TRAP] = 0;
mc->mc_gregs[VKI_PT_DAR] = fault_addr;
mc->mc_gregs[VKI_PT_DSISR] = 0;
mc->mc_gregs[VKI_PT_RESULT] = 0;
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid,
(Addr)mc, sizeof(struct vki_pt_regs) );
/* XXX should do FP and vector regs */
/* set up signal return trampoline */
VG_TRACK(pre_mem_write, Vg_CoreSignal, tst->tid, "signal frame mcontext",
(Addr)&mc->mc_pad, sizeof(mc->mc_pad));
mc->mc_pad[0] = 0x38000000U + ret; /* li 0,ret */
mc->mc_pad[1] = 0x44000002U; /* sc */
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid,
(Addr)&mc->mc_pad, sizeof(mc->mc_pad) );
/* invalidate any translation of this area */
VG_(discard_translations)( (Addr64)(Addr)&mc->mc_pad,
sizeof(mc->mc_pad), "stack_mcontext" );
/* set the signal handler to return to the trampoline */
SET_SIGNAL_LR(tst, (Addr) &mc->mc_pad[0]);
}
/* Create a signal frame for thread 'tid'. */
void VG_(sigframe_create) ( ThreadId tid,
Addr sp_top_of_frame,
const vki_siginfo_t *siginfo,
void *handler,
UInt flags,
const vki_sigset_t *mask,
void *restorer )
{
ThreadState* tst;
Addr sp;
struct hacky_sigframe* frame;
Int sigNo = siginfo->si_signo;
Int __NR_FAKE_SIGRETURN = __NR_AIX5_FAKE_SIGRETURN;
vg_assert(VG_IS_16_ALIGNED(sizeof(struct hacky_sigframe)));
sp_top_of_frame &= ~0xf;
sp = sp_top_of_frame - sizeof(struct hacky_sigframe);
tst = VG_(get_ThreadState)(tid);
if (!extend(tst, sp, sp_top_of_frame - sp))
return;
vg_assert(VG_IS_16_ALIGNED(sp));
frame = (struct hacky_sigframe *) sp;
/* clear it (very conservatively) */
VG_(memset)(&frame->lower_guardzone, 0, 512);
VG_(memset)(&frame->gst, 0, sizeof(VexGuestPPC32State));
VG_(memset)(&frame->gshadow, 0, sizeof(VexGuestPPC32State));
/* save stuff in frame */
frame->gst = tst->arch.vex;
frame->gshadow = tst->arch.vex_shadow;
frame->sigNo_private = sigNo;
frame->magicPI = 0x31415927;
/* Set up stack frame pointer */
sp += 256;
vg_assert(sp == (Addr)&frame->lower_guardzone[256]);
VG_TRACK( pre_mem_write, Vg_CoreSignal, tid, "signal handler frame",
sp, sizeof(UWord) );
*(Addr*)sp = tst->arch.vex.guest_GPR1;
VG_TRACK( post_mem_write, Vg_CoreSignal, tid,
sp, sizeof(UWord) );
/* Set regs for the handler */
SET_SIGNAL_GPR(tid, 1, sp);
SET_SIGNAL_GPR(tid, 2, ((UWord*)handler)[1]);
SET_SIGNAL_GPR(tid, 3, sigNo);
SET_SIGNAL_GPR(tid, 4, 0); /* XXX: the siginfo* */
SET_SIGNAL_GPR(tid, 5, 0); /* XXX: the ucontext* */
tst->arch.vex.guest_CIA = ((UWord*)handler)[0];
/* set up return trampoline */
vg_assert(__NR_FAKE_SIGRETURN >= 10000);
vg_assert(__NR_FAKE_SIGRETURN <= 32767);
frame->tramp[0] = 0x38400000U
+ __NR_FAKE_SIGRETURN; /* li 2,__NR_FAKE_SIGRETURN */
frame->tramp[1] = 0x44000002U; /* sc */
/* invalidate any translation of this area */
VG_(discard_translations)( (Addr64)(Addr)&frame->tramp[0],
sizeof(frame->tramp), "sigframe tramp" );
/* set the signal handler to return to the trampoline */
SET_SIGNAL_LR(tst, (Addr) &frame->tramp[0]);
VG_TRACK(post_mem_write, Vg_CoreSignal, tst->tid,
(Addr)&frame->tramp, sizeof(frame->tramp));
if (0) {
VG_(printf)("pushed signal frame for sig %d; R1 now = %p, "
"next %%CIA = %p, status=%d\n",
sigNo,
sp, tst->arch.vex.guest_CIA, tst->status);
VG_(printf)("trampoline is at %p\n", &frame->tramp[0]);
}
}
/* 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;
ThreadState* tst;
Int sigNo = siginfo->si_signo;
Addr faultaddr;
struct rt_sigframe* frame;
/* Stack must be 16-byte aligned */
vg_assert(VG_IS_16_ALIGNED(sizeof(struct vg_sig_private)));
vg_assert(VG_IS_16_ALIGNED(sizeof(struct rt_sigframe)));
sp_top_of_frame &= ~0xf;
sp = sp_top_of_frame - sizeof(struct rt_sigframe);
tst = VG_(get_ThreadState)(tid);
if (!extend(tst, sp, sp_top_of_frame - sp))
return;
vg_assert(VG_IS_16_ALIGNED(sp));
frame = (struct rt_sigframe *) sp;
/* clear it (conservatively) */
VG_(memset)(frame, 0, sizeof(*frame));
/////////
frame->pinfo = &frame->info;
frame->puc = &frame->uc;
frame->uc.uc_flags = 0;
frame->uc.uc_link = 0;
/////////
/* Set up the stack chain pointer */
VG_TRACK( pre_mem_write, Vg_CoreSignal, tid, "signal handler frame",
sp, sizeof(UWord) );
*(Addr *)sp = tst->arch.vex.guest_GPR1;
VG_TRACK( post_mem_write, Vg_CoreSignal, tid,
sp, sizeof(UWord) );
faultaddr = (Addr)siginfo->_sifields._sigfault._addr;
if (sigNo == VKI_SIGILL && siginfo->si_code > 0)
faultaddr = tst->arch.vex.guest_CIA;
VG_(memcpy)(&frame->info, siginfo, sizeof(*siginfo));
VG_TRACK( post_mem_write, Vg_CoreSignal, tid,
(Addr)&frame->info, sizeof(frame->info) );
frame->uc.uc_flags = 0;
frame->uc.uc_link = 0;
frame->uc.uc_stack = tst->altstack;
frame->uc.uc_sigmask = tst->sig_mask;
VG_TRACK( post_mem_write, Vg_CoreSignal, tid,
(Addr)(&frame->uc), sizeof(frame->uc) );
# define DO(gpr) frame->uc.uc_mcontext.gp_regs[VKI_PT_R0+gpr] \
= tst->arch.vex.guest_GPR##gpr
DO(0); DO(1); DO(2); DO(3); DO(4); DO(5); DO(6); DO(7);
DO(8); DO(9); DO(10); DO(11); DO(12); DO(13); DO(14); DO(15);
DO(16); DO(17); DO(18); DO(19); DO(20); DO(21); DO(22); DO(23);
DO(24); DO(25); DO(26); DO(27); DO(28); DO(29); DO(30); DO(31);
# undef DO
frame->uc.uc_mcontext.gp_regs[VKI_PT_NIP] = tst->arch.vex.guest_CIA;
frame->uc.uc_mcontext.gp_regs[VKI_PT_MSR] = 0xf032; /* pretty arbitrary */
frame->uc.uc_mcontext.gp_regs[VKI_PT_ORIG_R3] = tst->arch.vex.guest_GPR3;
frame->uc.uc_mcontext.gp_regs[VKI_PT_CTR] = tst->arch.vex.guest_CTR;
frame->uc.uc_mcontext.gp_regs[VKI_PT_LNK] = tst->arch.vex.guest_LR;
frame->uc.uc_mcontext.gp_regs[VKI_PT_XER] = LibVEX_GuestPPC64_get_XER(
&tst->arch.vex);
frame->uc.uc_mcontext.gp_regs[VKI_PT_CCR] = LibVEX_GuestPPC64_get_CR(
&tst->arch.vex);
//mc->mc_gregs[VKI_PT_MQ] = 0;
//mc->mc_gregs[VKI_PT_TRAP] = 0;
//mc->mc_gregs[VKI_PT_DAR] = fault_addr;
//mc->mc_gregs[VKI_PT_DSISR] = 0;
//mc->mc_gregs[VKI_PT_RESULT] = 0;
/* XXX should do FP and vector regs */
/* set up signal return trampoline */
/* NB. 5 Sept 07. mc->mc_pad[0..1] used to contain a the code to
which the signal handler returns, and it just did sys_sigreturn
or sys_rt_sigreturn. But this doesn't work if the stack is
non-executable, and it isn't consistent with the x86-linux and
amd64-linux scheme for removing the stack frame. So instead be
consistent and use a stub in m_trampoline. Then it doesn't
matter whether or not the (guest) stack is executable. This
fixes #149519 and #145837. */
frame->tramp[0] = 0; /* invalid */
frame->tramp[1] = 0; /* invalid */
VG_TRACK(post_mem_write, Vg_CoreSignal, tst->tid,
(Addr)&frame->tramp, sizeof(frame->tramp));
/* invalidate any translation of this area */
VG_(discard_translations)( (Addr64)&frame->tramp[0],
sizeof(frame->tramp), "stack_mcontext" );
/* set the signal handler to return to the trampoline */
SET_SIGNAL_LR(tst, (Addr)&VG_(ppc64_linux_SUBST_FOR_rt_sigreturn));
/* Stack pointer for the handler .. (note, back chain set
earlier) */
SET_SIGNAL_GPR(tid, 1, sp);
/* Args for the handler .. */
SET_SIGNAL_GPR(tid, 3, sigNo);
SET_SIGNAL_GPR(tid, 4, (Addr) &frame->info);
SET_SIGNAL_GPR(tid, 5, (Addr) &frame->uc);
/* the kernel sets this, though it doesn't seem to be in the ABI */
SET_SIGNAL_GPR(tid, 6, (Addr) &frame->info);
/* Handler is in fact a standard ppc64-linux function descriptor,
so extract the function entry point and also the toc ptr to use. */
SET_SIGNAL_GPR(tid, 2, (Addr) ((ULong*)handler)[1]);
tst->arch.vex.guest_CIA = (Addr) ((ULong*)handler)[0];
priv = &frame->priv;
priv->magicPI = 0x31415927;
priv->sigNo_private = sigNo;
priv->vex_shadow1 = tst->arch.vex_shadow1;
priv->vex_shadow2 = tst->arch.vex_shadow2;
if (0)
VG_(printf)("pushed signal frame; %%R1 now = %#lx, "
"next %%CIA = %#llx, status=%d\n",
sp, tst->arch.vex.guest_CIA, tst->status);
}