| |
| /*--------------------------------------------------------------------*/ |
| /*--- Create/destroy signal delivery frames. ---*/ |
| /*--- sigframe-ppc32-linux.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2000-2008 Nicholas Nethercote |
| njn@valgrind.org |
| Copyright (C) 2004-2008 Paul Mackerras |
| paulus@samba.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_aspacemgr.h" |
| #include "pub_core_libcbase.h" |
| #include "pub_core_libcassert.h" |
| #include "pub_core_libcprint.h" |
| #include "pub_core_machine.h" |
| #include "pub_core_options.h" |
| #include "pub_core_sigframe.h" |
| #include "pub_core_signals.h" |
| #include "pub_core_tooliface.h" |
| #include "pub_core_trampoline.h" |
| #include "pub_core_transtab.h" // VG_(discard_translations) |
| |
| |
| /* This module creates and removes signal frames for signal deliveries |
| on ppc32-linux. |
| |
| Note, this file contains kernel-specific knowledge in the form of |
| 'struct sigframe' and 'struct rt_sigframe'. How does that relate |
| to the vki kernel interface stuff? |
| |
| Either a 'struct sigframe' or a 'struct rtsigframe' is pushed |
| onto the client's stack. This contains a subsidiary |
| vki_ucontext. That holds the vcpu's state across the signal, |
| so that the sighandler can mess with the vcpu state if it |
| really wants. |
| |
| FIXME: sigcontexting is basically broken for the moment. When |
| delivering a signal, the integer registers and %eflags are |
| correctly written into the sigcontext, however the FP and SSE state |
| is not. When returning from a signal, only the integer registers |
| are restored from the sigcontext; the rest of the CPU state is |
| restored to what it was before the signal. |
| |
| This will be fixed. |
| */ |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Signal frame layouts ---*/ |
| /*------------------------------------------------------------*/ |
| |
| // A structure in which to save the application's registers |
| // during the execution of signal handlers. |
| |
| // Linux has 2 signal frame structures: one for normal signal |
| // deliveries, and one for SA_SIGINFO deliveries (also known as RT |
| // signals). |
| // |
| // In theory, so long as we get the arguments to the handler function |
| // right, it doesn't matter what the exact layout of the rest of the |
| // frame is. Unfortunately, things like gcc's exception unwinding |
| // make assumptions about the locations of various parts of the frame, |
| // so we need to duplicate it exactly. |
| |
| /* Structure containing bits of information that we want to save |
| on signal delivery. */ |
| struct vg_sig_private { |
| UInt magicPI; |
| UInt sigNo_private; |
| VexGuestPPC32State vex_shadow1; |
| VexGuestPPC32State vex_shadow2; |
| }; |
| |
| /* Structure put on stack for signal handlers with SA_SIGINFO clear. */ |
| struct nonrt_sigframe { |
| UInt gap1[16]; |
| struct vki_sigcontext sigcontext; |
| struct vki_mcontext mcontext; |
| struct vg_sig_private priv; |
| unsigned char abigap[224]; |
| }; |
| |
| /* Structure put on stack for signal handlers with SA_SIGINFO set. */ |
| struct rt_sigframe { |
| UInt gap1[20]; |
| vki_siginfo_t siginfo; |
| struct vki_ucontext ucontext; |
| struct vg_sig_private priv; |
| unsigned char abigap[224]; |
| }; |
| |
| #define SET_SIGNAL_LR(zztst, zzval) \ |
| do { tst->arch.vex.guest_LR = (zzval); \ |
| VG_TRACK( post_reg_write, Vg_CoreSignal, tst->tid, \ |
| offsetof(VexGuestPPC32State,guest_LR), \ |
| sizeof(UWord) ); \ |
| } while (0) |
| |
| #define SET_SIGNAL_GPR(zztst, zzn, zzval) \ |
| do { tst->arch.vex.guest_GPR##zzn = (zzval); \ |
| VG_TRACK( post_reg_write, Vg_CoreSignal, tst->tid, \ |
| offsetof(VexGuestPPC32State,guest_GPR##zzn), \ |
| sizeof(UWord) ); \ |
| } while (0) |
| |
| |
| 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)( (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)(use_rt_sigreturn |
| ? (Addr)&VG_(ppc32_linux_SUBST_FOR_rt_sigreturn) |
| : (Addr)&VG_(ppc32_linux_SUBST_FOR_sigreturn) |
| )); |
| } |
| |
| //:: /* Valgrind-specific parts of the signal frame */ |
| //:: struct vg_sigframe |
| //:: { |
| //:: /* Sanity check word. */ |
| //:: UInt magicPI; |
| //:: |
| //:: UInt handlerflags; /* flags for signal handler */ |
| //:: |
| //:: |
| //:: /* Safely-saved version of sigNo, as described above. */ |
| //:: Int sigNo_private; |
| //:: |
| //:: /* XXX This is wrong. Surely we should store the shadow values |
| //:: into the shadow memory behind the actual values? */ |
| //:: VexGuestPPC32State vex_shadow; |
| //:: |
| //:: /* HACK ALERT */ |
| //:: VexGuestPPC32State vex; |
| //:: /* end HACK ALERT */ |
| //:: |
| //:: /* saved signal mask to be restored when handler returns */ |
| //:: vki_sigset_t mask; |
| //:: |
| //:: /* Sanity check word. Is the highest-addressed word; do not |
| //:: move!*/ |
| //:: UInt magicE; |
| //:: }; |
| //:: |
| //:: struct sigframe |
| //:: { |
| //:: /* Sig handler's return address */ |
| //:: Addr retaddr; |
| //:: Int sigNo; |
| //:: |
| //:: struct vki_sigcontext sigContext; |
| //:: //.. struct _vki_fpstate fpstate; |
| //:: |
| //:: struct vg_sigframe vg; |
| //:: }; |
| //:: |
| //:: struct rt_sigframe |
| //:: { |
| //:: /* Sig handler's return address */ |
| //:: Addr retaddr; |
| //:: Int sigNo; |
| //:: |
| //:: /* ptr to siginfo_t. */ |
| //:: Addr psigInfo; |
| //:: |
| //:: /* ptr to ucontext */ |
| //:: Addr puContext; |
| //:: /* pointed to by psigInfo */ |
| //:: vki_siginfo_t sigInfo; |
| //:: |
| //:: /* pointed to by puContext */ |
| //:: struct vki_ucontext uContext; |
| //:: //.. struct _vki_fpstate fpstate; |
| //:: |
| //:: struct vg_sigframe vg; |
| //:: }; |
| |
| |
| //:: /*------------------------------------------------------------*/ |
| //:: /*--- Signal operations ---*/ |
| //:: /*------------------------------------------------------------*/ |
| //:: |
| //:: /* |
| //:: Great gobs of FP state conversion taken wholesale from |
| //:: linux/arch/i386/kernel/i387.c |
| //:: */ |
| //:: |
| //:: /* |
| //:: * FXSR floating point environment conversions. |
| //:: */ |
| //:: #define X86_FXSR_MAGIC 0x0000 |
| //:: |
| //:: /* |
| //:: * FPU tag word conversions. |
| //:: */ |
| //:: |
| //:: static inline unsigned short twd_i387_to_fxsr( unsigned short twd ) |
| //:: { |
| //:: unsigned int tmp; /* to avoid 16 bit prefixes in the code */ |
| //:: |
| //:: /* Transform each pair of bits into 01 (valid) or 00 (empty) */ |
| //:: tmp = ~twd; |
| //:: tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */ |
| //:: /* and move the valid bits to the lower byte. */ |
| //:: tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */ |
| //:: tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */ |
| //:: tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */ |
| //:: return tmp; |
| //:: } |
| //:: |
| //:: static unsigned long twd_fxsr_to_i387( const struct i387_fxsave_struct *fxsave ) |
| //:: { |
| //:: struct _vki_fpxreg *st = NULL; |
| //:: unsigned long twd = (unsigned long) fxsave->twd; |
| //:: unsigned long tag; |
| //:: unsigned long ret = 0xffff0000u; |
| //:: int i; |
| //:: |
| //:: #define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16); |
| //:: |
| //:: for ( i = 0 ; i < 8 ; i++ ) { |
| //:: if ( twd & 0x1 ) { |
| //:: st = (struct _vki_fpxreg *) FPREG_ADDR( fxsave, i ); |
| //:: |
| //:: switch ( st->exponent & 0x7fff ) { |
| //:: case 0x7fff: |
| //:: tag = 2; /* Special */ |
| //:: break; |
| //:: case 0x0000: |
| //:: if ( !st->significand[0] && |
| //:: !st->significand[1] && |
| //:: !st->significand[2] && |
| //:: !st->significand[3] ) { |
| //:: tag = 1; /* Zero */ |
| //:: } else { |
| //:: tag = 2; /* Special */ |
| //:: } |
| //:: break; |
| //:: default: |
| //:: if ( st->significand[3] & 0x8000 ) { |
| //:: tag = 0; /* Valid */ |
| //:: } else { |
| //:: tag = 2; /* Special */ |
| //:: } |
| //:: break; |
| //:: } |
| //:: } else { |
| //:: tag = 3; /* Empty */ |
| //:: } |
| //:: ret |= (tag << (2 * i)); |
| //:: twd = twd >> 1; |
| //:: } |
| //:: return ret; |
| //:: } |
| //:: |
| //:: static void convert_fxsr_to_user( struct _vki_fpstate *buf, |
| //:: const struct i387_fxsave_struct *fxsave ) |
| //:: { |
| //:: unsigned long env[7]; |
| //:: struct _vki_fpreg *to; |
| //:: struct _vki_fpxreg *from; |
| //:: int i; |
| //:: |
| //:: env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul; |
| //:: env[1] = (unsigned long)fxsave->swd | 0xffff0000ul; |
| //:: env[2] = twd_fxsr_to_i387(fxsave); |
| //:: env[3] = fxsave->fip; |
| //:: env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16); |
| //:: env[5] = fxsave->foo; |
| //:: env[6] = fxsave->fos; |
| //:: |
| //:: VG_(memcpy)(buf, env, 7 * sizeof(unsigned long)); |
| //:: |
| //:: to = &buf->_st[0]; |
| //:: from = (struct _vki_fpxreg *) &fxsave->st_space[0]; |
| //:: for ( i = 0 ; i < 8 ; i++, to++, from++ ) { |
| //:: unsigned long __user *t = (unsigned long __user *)to; |
| //:: unsigned long *f = (unsigned long *)from; |
| //:: |
| //:: t[0] = f[0]; |
| //:: t[1] = f[1]; |
| //:: to->exponent = from->exponent; |
| //:: } |
| //:: } |
| //:: |
| //:: static void convert_fxsr_from_user( struct i387_fxsave_struct *fxsave, |
| //:: const struct _vki_fpstate *buf ) |
| //:: { |
| //:: unsigned long env[7]; |
| //:: struct _vki_fpxreg *to; |
| //:: const struct _vki_fpreg *from; |
| //:: int i; |
| //:: |
| //:: VG_(memcpy)(env, buf, 7 * sizeof(long)); |
| //:: |
| //:: fxsave->cwd = (unsigned short)(env[0] & 0xffff); |
| //:: fxsave->swd = (unsigned short)(env[1] & 0xffff); |
| //:: fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff)); |
| //:: fxsave->fip = env[3]; |
| //:: fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16); |
| //:: fxsave->fcs = (env[4] & 0xffff); |
| //:: fxsave->foo = env[5]; |
| //:: fxsave->fos = env[6]; |
| //:: |
| //:: to = (struct _vki_fpxreg *) &fxsave->st_space[0]; |
| //:: from = &buf->_st[0]; |
| //:: for ( i = 0 ; i < 8 ; i++, to++, from++ ) { |
| //:: unsigned long *t = (unsigned long *)to; |
| //:: unsigned long __user *f = (unsigned long __user *)from; |
| //:: |
| //:: t[0] = f[0]; |
| //:: t[1] = f[1]; |
| //:: to->exponent = from->exponent; |
| //:: } |
| //:: } |
| //:: |
| //:: static inline void save_i387_fsave( arch_thread_t *regs, struct _vki_fpstate *buf ) |
| //:: { |
| //:: struct i387_fsave_struct *fs = ®s->m_sse.fsave; |
| //:: |
| //:: fs->status = fs->swd; |
| //:: VG_(memcpy)(buf, fs, sizeof(*fs)); |
| //:: } |
| //:: |
| //:: static void save_i387_fxsave( arch_thread_t *regs, struct _vki_fpstate *buf ) |
| //:: { |
| //:: const struct i387_fxsave_struct *fx = ®s->m_sse.fxsave; |
| //:: convert_fxsr_to_user( buf, fx ); |
| //:: |
| //:: buf->status = fx->swd; |
| //:: buf->magic = X86_FXSR_MAGIC; |
| //:: VG_(memcpy)(buf->_fxsr_env, fx, sizeof(struct i387_fxsave_struct)); |
| //:: } |
| //:: |
| //:: static void save_i387( arch_thread_t *regs, struct _vki_fpstate *buf ) |
| //:: { |
| //:: if ( VG_(have_ssestate) ) |
| //:: save_i387_fxsave( regs, buf ); |
| //:: else |
| //:: save_i387_fsave( regs, buf ); |
| //:: } |
| //:: |
| //:: static inline void restore_i387_fsave( arch_thread_t *regs, const struct _vki_fpstate __user *buf ) |
| //:: { |
| //:: VG_(memcpy)( ®s->m_sse.fsave, buf, sizeof(struct i387_fsave_struct) ); |
| //:: } |
| //:: |
| //:: static void restore_i387_fxsave( arch_thread_t *regs, const struct _vki_fpstate __user *buf ) |
| //:: { |
| //:: VG_(memcpy)(®s->m_sse.fxsave, &buf->_fxsr_env[0], |
| //:: sizeof(struct i387_fxsave_struct) ); |
| //:: /* mxcsr reserved bits must be masked to zero for security reasons */ |
| //:: regs->m_sse.fxsave.mxcsr &= 0xffbf; |
| //:: convert_fxsr_from_user( ®s->m_sse.fxsave, buf ); |
| //:: } |
| //:: |
| //:: static void restore_i387( arch_thread_t *regs, const struct _vki_fpstate __user *buf ) |
| //:: { |
| //:: if ( VG_(have_ssestate) ) { |
| //:: restore_i387_fxsave( regs, buf ); |
| //:: } else { |
| //:: restore_i387_fsave( regs, buf ); |
| //:: } |
| //:: } |
| |
| |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Creating signal frames ---*/ |
| /*------------------------------------------------------------*/ |
| |
| //.. /* Create a plausible-looking sigcontext from the thread's |
| //.. Vex guest state. NOTE: does not fill in the FP or SSE |
| //.. bits of sigcontext at the moment. |
| //.. */ |
| //.. static |
| //.. void synth_ucontext(ThreadId tid, const vki_siginfo_t *si, |
| //.. const vki_sigset_t *set, struct vki_ucontext *uc) |
| //.. { |
| //.. ThreadState *tst = VG_(get_ThreadState)(tid); |
| //.. struct vki_sigcontext *sc = &uc->uc_mcontext; |
| //.. |
| //.. VG_(memset)(uc, 0, sizeof(*uc)); |
| //.. |
| //.. uc->uc_flags = 0; |
| //.. uc->uc_link = 0; |
| //.. uc->uc_sigmask = *set; |
| //.. uc->uc_stack = tst->altstack; |
| //.. sc->fpstate = fpstate; |
| //.. |
| //.. // FIXME: save_i387(&tst->arch, fpstate); |
| //.. |
| //.. # define SC2(reg,REG) sc->reg = tst->arch.vex.guest_##REG |
| //.. SC2(gs,GS); |
| //.. SC2(fs,FS); |
| //.. SC2(es,ES); |
| //.. SC2(ds,DS); |
| //.. |
| //.. SC2(edi,EDI); |
| //.. SC2(esi,ESI); |
| //.. SC2(ebp,EBP); |
| //.. SC2(esp,ESP); |
| //.. SC2(ebx,EBX); |
| //.. SC2(edx,EDX); |
| //.. SC2(ecx,ECX); |
| //.. SC2(eax,EAX); |
| //.. |
| //.. SC2(eip,EIP); |
| //.. SC2(cs,CS); |
| //.. sc->eflags = LibVEX_GuestX86_get_eflags(&tst->arch.vex); |
| //.. SC2(ss,SS); |
| //.. /* XXX esp_at_signal */ |
| //.. /* XXX trapno */ |
| //.. /* XXX err */ |
| //.. # undef SC2 |
| //.. |
| //.. sc->cr2 = (UInt)si->_sifields._sigfault._addr; |
| //.. } |
| /* |
| //.. #define SET_SIGNAL_ESP(zztid, zzval) \ |
| //.. SET_THREAD_REG(zztid, zzval, STACK_PTR, post_reg_write, \ |
| //.. Vg_CoreSignal, zztid, VG_O_STACK_PTR, sizeof(Addr)) |
| */ |
| |
| /* Extend the stack segment downwards if needed so as to ensure the |
| new signal frames are mapped to something. Return a Bool |
| indicating whether or not the operation was successful. |
| */ |
| static Bool extend ( ThreadState *tst, Addr addr, SizeT size ) |
| { |
| ThreadId tid = tst->tid; |
| NSegment const* stackseg = NULL; |
| |
| if (VG_(extend_stack)(addr, tst->client_stack_szB)) { |
| stackseg = VG_(am_find_nsegment)(addr); |
| if (0 && stackseg) |
| VG_(printf)("frame=%#lx seg=%#lx-%#lx\n", |
| addr, stackseg->start, stackseg->end); |
| } |
| |
| if (stackseg == NULL || !stackseg->hasR || !stackseg->hasW) { |
| VG_(message)( |
| Vg_UserMsg, |
| "Can't extend stack to %#lx during signal delivery for thread %d:", |
| addr, tid); |
| if (stackseg == NULL) |
| VG_(message)(Vg_UserMsg, " no stack segment"); |
| else |
| VG_(message)(Vg_UserMsg, " too small or bad protection modes"); |
| |
| /* set SIGSEGV to default handler */ |
| VG_(set_default_handler)(VKI_SIGSEGV); |
| VG_(synth_fault_mapping)(tid, addr); |
| |
| /* The whole process should be about to die, since the default |
| action of SIGSEGV to kill the whole process. */ |
| return False; |
| } |
| |
| /* For tracking memory events, indicate the entire frame has been |
| allocated. */ |
| VG_TRACK( new_mem_stack_signal, addr - VG_STACK_REDZONE_SZB, |
| size + VG_STACK_REDZONE_SZB, tid ); |
| |
| return True; |
| } |
| |
| //.. /* Build the Valgrind-specific part of a signal frame. */ |
| //.. |
| //.. static void build_vg_sigframe(struct vg_sigframe *frame, |
| //.. ThreadState *tst, |
| //.. const vki_sigset_t *mask, |
| //.. UInt flags, |
| //.. Int sigNo) |
| //.. { |
| //.. frame->sigNo_private = sigNo; |
| //.. frame->magicPI = 0x31415927; |
| //.. frame->vex_shadow = tst->arch.vex_shadow; |
| //.. /* HACK ALERT */ |
| //.. frame->vex = tst->arch.vex; |
| //.. /* end HACK ALERT */ |
| //.. frame->mask = tst->sig_mask; |
| //.. frame->handlerflags = flags; |
| //.. frame->magicE = 0x27182818; |
| //.. } |
| |
| |
| //.. 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 = 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 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 = 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_CIA; |
| //.. |
| //.. 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; |
| //.. } |
| |
| |
| /* 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; |
| |
| /* Stack must be 16-byte aligned */ |
| sp_top_of_frame &= ~0xf; |
| |
| if (flags & VKI_SA_SIGINFO) { |
| sp = sp_top_of_frame - sizeof(struct rt_sigframe); |
| } else { |
| sp = sp_top_of_frame - sizeof(struct nonrt_sigframe); |
| } |
| |
| tst = VG_(get_ThreadState)(tid); |
| |
| if (!extend(tst, sp, sp_top_of_frame - sp)) |
| return; |
| |
| vg_assert(VG_IS_16_ALIGNED(sp)); |
| |
| /* 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; |
| |
| if (flags & VKI_SA_SIGINFO) { |
| struct rt_sigframe *frame = (struct rt_sigframe *) sp; |
| struct vki_ucontext *ucp = &frame->ucontext; |
| |
| VG_TRACK( pre_mem_write, Vg_CoreSignal, tid, "signal frame siginfo", |
| (Addr)&frame->siginfo, sizeof(frame->siginfo) ); |
| VG_(memcpy)(&frame->siginfo, siginfo, sizeof(*siginfo)); |
| VG_TRACK( post_mem_write, Vg_CoreSignal, tid, |
| (Addr)&frame->siginfo, sizeof(frame->siginfo) ); |
| |
| VG_TRACK( pre_mem_write, Vg_CoreSignal, tid, "signal frame ucontext", |
| (Addr)ucp, offsetof(struct vki_ucontext, uc_pad) ); |
| ucp->uc_flags = 0; |
| ucp->uc_link = 0; |
| ucp->uc_stack = tst->altstack; |
| VG_TRACK( post_mem_write, Vg_CoreSignal, tid, (Addr)ucp, |
| offsetof(struct vki_ucontext, uc_pad) ); |
| |
| VG_TRACK( pre_mem_write, Vg_CoreSignal, tid, "signal frame ucontext", |
| (Addr)&ucp->uc_regs, |
| sizeof(ucp->uc_regs) + sizeof(ucp->uc_sigmask) ); |
| ucp->uc_regs = &ucp->uc_mcontext; |
| ucp->uc_sigmask = tst->sig_mask; |
| VG_TRACK( post_mem_write, Vg_CoreSignal, tid, |
| (Addr)&ucp->uc_regs, |
| sizeof(ucp->uc_regs) + sizeof(ucp->uc_sigmask) ); |
| |
| stack_mcontext(&ucp->uc_mcontext, tst, True/*use_rt_sigreturn*/, faultaddr); |
| priv = &frame->priv; |
| |
| SET_SIGNAL_GPR(tid, 4, (Addr) &frame->siginfo); |
| SET_SIGNAL_GPR(tid, 5, (Addr) ucp); |
| /* the kernel sets this, though it doesn't seem to be in the ABI */ |
| SET_SIGNAL_GPR(tid, 6, (Addr) &frame->siginfo); |
| |
| } else { |
| /* non-RT signal delivery */ |
| struct nonrt_sigframe *frame = (struct nonrt_sigframe *) sp; |
| struct vki_sigcontext *scp = &frame->sigcontext; |
| |
| VG_TRACK( pre_mem_write, Vg_CoreSignal, tid, "signal frame sigcontext", |
| (Addr)&scp->_unused[3], sizeof(*scp) - 3 * sizeof(UInt) ); |
| scp->signal = sigNo; |
| scp->handler = (Addr) handler; |
| scp->oldmask = tst->sig_mask.sig[0]; |
| scp->_unused[3] = tst->sig_mask.sig[1]; |
| VG_TRACK( post_mem_write, Vg_CoreSignal, tid, |
| (Addr)&scp->_unused[3], sizeof(*scp) - 3 * sizeof(UInt) ); |
| |
| stack_mcontext(&frame->mcontext, tst, False/*!use_rt_sigreturn*/, faultaddr); |
| priv = &frame->priv; |
| |
| SET_SIGNAL_GPR(tid, 4, (Addr) scp); |
| } |
| |
| priv->magicPI = 0x31415927; |
| priv->sigNo_private = sigNo; |
| priv->vex_shadow1 = tst->arch.vex_shadow1; |
| priv->vex_shadow2 = tst->arch.vex_shadow2; |
| |
| SET_SIGNAL_GPR(tid, 1, sp); |
| SET_SIGNAL_GPR(tid, 3, sigNo); |
| tst->arch.vex.guest_CIA = (Addr) handler; |
| |
| //.. Addr esp; |
| //.. ThreadState* tst = VG_(get_ThreadState)(tid); |
| //.. |
| //.. if (flags & VKI_SA_SIGINFO) |
| //.. esp = build_rt_sigframe(tst, esp_top_of_frame, siginfo, |
| //.. handler, flags, mask, restorer); |
| //.. else |
| //.. esp = build_sigframe(tst, esp_top_of_frame, |
| //.. siginfo, handler, flags, mask, restorer); |
| //.. |
| //.. /* Set the thread so it will next run the handler. */ |
| //.. /* tst->m_esp = esp; */ |
| //.. SET_SIGNAL_ESP(tid, esp); |
| //.. |
| //.. //VG_(printf)("handler = %p\n", handler); |
| //.. tst->arch.vex.guest_CIA = (Addr) handler; |
| //.. /* This thread needs to be marked runnable, but we leave that the |
| //.. caller to do. */ |
| |
| if (0) |
| VG_(printf)("pushed signal frame; %%R1 now = %#lx, " |
| "next %%CIA = %#x, status=%d\n", |
| sp, tst->arch.vex.guest_CIA, tst->status); |
| } |
| |
| |
| /*------------------------------------------------------------*/ |
| /*--- Destroying signal frames ---*/ |
| /*------------------------------------------------------------*/ |
| |
| //.. /* Return False and don't do anything, just set the client to take a |
| //.. segfault, if it looks like the frame is corrupted. */ |
| //.. static |
| //.. Bool restore_vg_sigframe ( ThreadState *tst, |
| //.. struct vg_sigframe *frame, Int *sigNo ) |
| //.. { |
| //.. if (frame->magicPI != 0x31415927 || |
| //.. frame->magicE != 0x27182818) { |
| //.. VG_(message)(Vg_UserMsg, "Thread %d return signal frame " |
| //.. "corrupted. Killing process.", |
| //.. tst->tid); |
| //.. VG_(set_default_handler)(VKI_SIGSEGV); |
| //.. VG_(synth_fault)(tst->tid); |
| //.. *sigNo = VKI_SIGSEGV; |
| //.. return False; |
| //.. } |
| //.. tst->sig_mask = frame->mask; |
| //.. tst->tmp_sig_mask = frame->mask; |
| //.. tst->arch.vex_shadow = frame->vex_shadow; |
| //.. /* HACK ALERT */ |
| //.. tst->arch.vex = frame->vex; |
| //.. /* end HACK ALERT */ |
| //.. *sigNo = frame->sigNo_private; |
| //.. return True; |
| //.. } |
| |
| //.. static |
| //.. void restore_sigcontext( ThreadState *tst, |
| //.. struct vki_sigcontext *sc ) |
| //.. //.. struct vki_sigcontext *sc, struct _vki_fpstate *fpstate ) |
| //.. { |
| //.. tst->arch.vex.guest_EAX = sc->eax; |
| //.. tst->arch.vex.guest_ECX = sc->ecx; |
| //.. tst->arch.vex.guest_EDX = sc->edx; |
| //.. tst->arch.vex.guest_EBX = sc->ebx; |
| //.. tst->arch.vex.guest_EBP = sc->ebp; |
| //.. tst->arch.vex.guest_ESP = sc->esp; |
| //.. tst->arch.vex.guest_ESI = sc->esi; |
| //.. tst->arch.vex.guest_EDI = sc->edi; |
| //.. //:: tst->arch.vex.guest_eflags = sc->eflags; |
| //.. //:: tst->arch.vex.guest_EIP = sc->eip; |
| //.. |
| //.. tst->arch.vex.guest_CS = sc->cs; |
| //.. tst->arch.vex.guest_SS = sc->ss; |
| //.. tst->arch.vex.guest_DS = sc->ds; |
| //.. tst->arch.vex.guest_ES = sc->es; |
| //.. tst->arch.vex.guest_FS = sc->fs; |
| //.. tst->arch.vex.guest_GS = sc->gs; |
| //.. |
| //.. //:: restore_i387(&tst->arch, fpstate); |
| //.. } |
| |
| |
| //.. static |
| //.. SizeT restore_sigframe ( ThreadState *tst, |
| //.. struct sigframe *frame, Int *sigNo ) |
| //.. { |
| //.. if (restore_vg_sigframe(tst, &frame->vg, sigNo)) |
| //.. restore_sigcontext(tst, &frame->sigContext, &frame->fpstate); |
| //.. return sizeof(*frame); |
| //.. } |
| |
| //.. static |
| //.. SizeT restore_rt_sigframe ( ThreadState *tst, |
| //.. struct rt_sigframe *frame, Int *sigNo ) |
| //.. { |
| //.. if (restore_vg_sigframe(tst, &frame->vg, sigNo)) |
| //.. restore_sigcontext(tst, &frame->uContext.uc_mcontext, &frame->fpstate); |
| //.. return sizeof(*frame); |
| //.. } |
| |
| |
| /* EXPORTED */ |
| void VG_(sigframe_destroy)( ThreadId tid, Bool isRT ) |
| { |
| ThreadState *tst; |
| struct vg_sig_private *priv; |
| Addr sp; |
| UInt frame_size; |
| struct vki_mcontext *mc; |
| Int sigNo; |
| Bool has_siginfo = isRT; |
| |
| vg_assert(VG_(is_valid_tid)(tid)); |
| tst = VG_(get_ThreadState)(tid); |
| |
| /* Check that the stack frame looks valid */ |
| sp = tst->arch.vex.guest_GPR1; |
| vg_assert(VG_IS_16_ALIGNED(sp)); |
| /* JRS 17 Nov 05: This code used to check that *sp -- which should |
| have been set by the stwu at the start of the handler -- points |
| to just above the frame (ie, the previous frame). However, that |
| isn't valid when delivering signals on alt stacks. So I removed |
| it. The frame is still sanity-checked using the priv->magicPI |
| field. */ |
| |
| if (has_siginfo) { |
| struct rt_sigframe *frame = (struct rt_sigframe *)sp; |
| frame_size = sizeof(*frame); |
| mc = &frame->ucontext.uc_mcontext; |
| priv = &frame->priv; |
| vg_assert(priv->magicPI == 0x31415927); |
| tst->sig_mask = frame->ucontext.uc_sigmask; |
| } else { |
| struct nonrt_sigframe *frame = (struct nonrt_sigframe *)sp; |
| frame_size = sizeof(*frame); |
| mc = &frame->mcontext; |
| priv = &frame->priv; |
| vg_assert(priv->magicPI == 0x31415927); |
| tst->sig_mask.sig[0] = frame->sigcontext.oldmask; |
| tst->sig_mask.sig[1] = frame->sigcontext._unused[3]; |
| } |
| tst->tmp_sig_mask = tst->sig_mask; |
| |
| sigNo = priv->sigNo_private; |
| |
| # define DO(gpr) tst->arch.vex.guest_GPR##gpr = mc->mc_gregs[VKI_PT_R0+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 |
| |
| tst->arch.vex.guest_CIA = mc->mc_gregs[VKI_PT_NIP]; |
| |
| // Umm ... ? (jrs 2005 July 8) |
| // tst->arch.m_orig_gpr3 = mc->mc_gregs[VKI_PT_ORIG_R3]; |
| |
| LibVEX_GuestPPC32_put_CR( mc->mc_gregs[VKI_PT_CCR], &tst->arch.vex ); |
| |
| tst->arch.vex.guest_LR = mc->mc_gregs[VKI_PT_LNK]; |
| tst->arch.vex.guest_CTR = mc->mc_gregs[VKI_PT_CTR]; |
| LibVEX_GuestPPC32_put_XER( mc->mc_gregs[VKI_PT_XER], &tst->arch.vex ); |
| |
| tst->arch.vex_shadow1 = priv->vex_shadow1; |
| tst->arch.vex_shadow2 = priv->vex_shadow2; |
| |
| VG_TRACK(die_mem_stack_signal, sp, frame_size); |
| |
| if (VG_(clo_trace_signals)) |
| VG_(message)(Vg_DebugMsg, |
| "vg_pop_signal_frame (thread %d): isRT=%d valid magic; EIP=%#x", |
| tid, has_siginfo, tst->arch.vex.guest_CIA); |
| |
| /* tell the tools */ |
| VG_TRACK( post_deliver_signal, tid, sigNo ); |
| |
| //.. Addr esp; |
| //.. ThreadState* tst; |
| //.. SizeT size; |
| //.. Int sigNo; |
| //.. |
| //.. tst = VG_(get_ThreadState)(tid); |
| //.. |
| //.. /* Correctly reestablish the frame base address. */ |
| //.. esp = tst->arch.vex.guest_ESP; |
| //.. |
| //.. if (!isRT) |
| //.. size = restore_sigframe(tst, (struct sigframe *)esp, &sigNo); |
| //.. else |
| //.. size = restore_rt_sigframe(tst, (struct rt_sigframe *)esp, &sigNo); |
| //.. |
| //.. VG_TRACK( die_mem_stack_signal, esp, size ); |
| //.. |
| //.. if (VG_(clo_trace_signals)) |
| //.. VG_(message)( |
| //.. Vg_DebugMsg, |
| //.. "VG_(signal_return) (thread %d): isRT=%d valid magic; EIP=%p", |
| //.. tid, isRT, tst->arch.vex.guest_EIP); |
| //.. |
| //.. /* tell the tools */ |
| //.. VG_TRACK( post_deliver_signal, tid, sigNo ); |
| } |
| |
| /*--------------------------------------------------------------------*/ |
| /*--- end sigframe-ppc32-linux.c ---*/ |
| /*--------------------------------------------------------------------*/ |