sigframe-x86-darwin.c revision ed07e00d438c74b7a23c01bfffde77e3968305e4
1ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 2ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 3ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- Create/destroy signal delivery frames. ---*/ 4ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- sigframe-x86-darwin.c ---*/ 5ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 6ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 7ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* 8ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This file is part of Valgrind, a dynamic binary instrumentation 9ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown framework. 10ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 11ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Copyright (C) 2006-2010 OpenWorks Ltd 12ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown info@open-works.co.uk 13ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 14ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This program is free software; you can redistribute it and/or 15ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown modify it under the terms of the GNU General Public License as 16ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown published by the Free Software Foundation; either version 2 of the 17ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown License, or (at your option) any later version. 18ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 19ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This program is distributed in the hope that it will be useful, but 20ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown WITHOUT ANY WARRANTY; without even the implied warranty of 21ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 22ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown General Public License for more details. 23ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 24ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown You should have received a copy of the GNU General Public License 25ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown along with this program; if not, write to the Free Software 26ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 27ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 02111-1307, USA. 28ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 29ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown The GNU General Public License is contained in the file COPYING. 30ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown*/ 31ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 32ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#if defined(VGP_x86_darwin) 33ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 34ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_basics.h" 35ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_vki.h" 36ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_vkiscnums.h" 37ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_threadstate.h" 38ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_aspacemgr.h" 39ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcbase.h" 40ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcassert.h" 41ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcprint.h" 42ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_machine.h" 43ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_options.h" 44ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_signals.h" 45ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_tooliface.h" 46ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_trampoline.h" 47ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_sigframe.h" /* self */ 48ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 49ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 50ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* Cheap-ass hack copied from ppc32-aix5 code, just to get started. 51ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Produce a frame with layout entirely of our own choosing. */ 52ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 53ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* This module creates and removes signal frames for signal deliveries 54ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown on x86-darwin. Kludgey; the machine state ought to be saved in a 55ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ucontext and retrieved from it later, so the handler can modify it 56ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown and return. However .. for now .. just stick the vex guest state 57ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown in the frame and snarf it again later. 58ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 59ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Also, don't bother with creating siginfo and ucontext in the 60ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown handler, although do point them somewhere non-faulting. 61ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 62ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Frame should have a 16-aligned size, just in case that turns out to 63ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown be important for Darwin. (be conservative) 64ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown*/ 65ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstruct hacky_sigframe { 66ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* first four words look like a call to a 3-arg x86 function */ 67ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UInt returnAddr; 68ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UInt a1_signo; 69ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UInt a2_siginfo; 70ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UInt a3_ucontext; 71ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UChar lower_guardzone[512]; // put nothing here 72ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VexGuestX86State gst; 73ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VexGuestX86State gshadow1; 74ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VexGuestX86State gshadow2; 75ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown vki_siginfo_t fake_siginfo; 76ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown struct vki_ucontext fake_ucontext; 77ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UInt magicPI; 78ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UInt sigNo_private; 79ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown vki_sigset_t mask; // saved sigmask; restore when hdlr returns 80ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UInt __pad[1]; 81ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UChar upper_guardzone[512]; // put nothing here 82ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // and don't zero it, since that might overwrite the client's 83ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // stack redzone, at least on archs which have one 84ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown}; 85ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 86ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 87ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* Extend the stack segment downwards if needed so as to ensure the 88ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown new signal frames are mapped to something. Return a Bool 89ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown indicating whether or not the operation was successful. 90ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown*/ 91ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic Bool extend ( ThreadState *tst, Addr addr, SizeT size ) 92ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 93ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ThreadId tid = tst->tid; 94ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* For tracking memory events, indicate the entire frame has been 95ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown allocated. Except, don't mess with the area which 96ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown overlaps the previous frame's redzone. */ 97ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* XXX is the following call really right? compared with the 98ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown amd64-linux version, this doesn't appear to handle the redzone 99ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown in the same way. */ 100ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_TRACK( new_mem_stack_signal, 101ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown addr - VG_STACK_REDZONE_SZB, size, tid ); 102ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return True; 103ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 104ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 105ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 106ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* Create a signal frame for thread 'tid'. Make a 3-arg frame 107ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown regardless of whether the client originally requested a 1-arg 108ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown version (no SA_SIGINFO) or a 3-arg one (SA_SIGINFO) since in the 109ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown former case, the x86 calling conventions will simply cause the 110ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown extra 2 args to be ignored (inside the handler). */ 111ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid VG_(sigframe_create) ( ThreadId tid, 112ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Addr sp_top_of_frame, 113ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown const vki_siginfo_t *siginfo, 114ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown const struct vki_ucontext *siguc, 115ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown void *handler, 116ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UInt flags, 117ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown const vki_sigset_t *mask, 118ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown void *restorer ) 119ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 120ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ThreadState* tst; 121ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Addr esp; 122ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown struct hacky_sigframe* frame; 123ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int sigNo = siginfo->si_signo; 124ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 125ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown vg_assert(VG_IS_16_ALIGNED(sizeof(struct hacky_sigframe))); 126ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 127ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sp_top_of_frame &= ~0xf; 128ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown esp = sp_top_of_frame - sizeof(struct hacky_sigframe); 129ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 130ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown tst = VG_(get_ThreadState)(tid); 131ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!extend(tst, esp, sp_top_of_frame - esp)) 132ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return; 133ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 134ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown vg_assert(VG_IS_16_ALIGNED(esp)); 135ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 136ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame = (struct hacky_sigframe *) esp; 137ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 138ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* clear it (very conservatively) (why so conservatively??) */ 139ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(memset)(&frame->lower_guardzone, 0, 512); 140ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(memset)(&frame->gst, 0, sizeof(VexGuestX86State)); 141ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(memset)(&frame->gshadow1, 0, sizeof(VexGuestX86State)); 142ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(memset)(&frame->gshadow2, 0, sizeof(VexGuestX86State)); 143ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(memset)(&frame->fake_siginfo, 0, sizeof(frame->fake_siginfo)); 144ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(memset)(&frame->fake_ucontext, 0, sizeof(frame->fake_ucontext)); 145ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 146ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* save stuff in frame */ 147ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->gst = tst->arch.vex; 148ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->gshadow1 = tst->arch.vex_shadow1; 149ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->gshadow2 = tst->arch.vex_shadow2; 150ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->sigNo_private = sigNo; 151ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->mask = tst->sig_mask; 152ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->magicPI = 0x31415927; 153ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 154ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* Minimally fill in the siginfo and ucontext. Note, utter 155ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown lameness prevails. Be underwhelmed, be very underwhelmed. */ 156ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->fake_siginfo.si_signo = sigNo; 157ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->fake_siginfo.si_code = siginfo->si_code; 158ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 159ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* Set up stack pointer */ 160ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown vg_assert(esp == (Addr)&frame->returnAddr); 161ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(set_SP)(tid, esp); 162ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_TRACK( post_reg_write, Vg_CoreSignal, tid, VG_O_STACK_PTR, sizeof(UInt)); 163ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 164ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* Set up program counter */ 165ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(set_IP)(tid, (UInt)handler); 166ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_TRACK( post_reg_write, Vg_CoreSignal, tid, VG_O_INSTR_PTR, sizeof(UInt)); 167ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 168ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* Set up RA and args for the frame */ 169ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_TRACK( pre_mem_write, Vg_CoreSignal, tid, "signal handler frame", 170ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown (Addr)frame, 4*sizeof(UInt) ); 171ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->returnAddr = (UInt)&VG_(x86_darwin_SUBST_FOR_sigreturn); 172ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->a1_signo = sigNo; 173ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->a2_siginfo = (UInt)&frame->fake_siginfo; /* oh well */ 174ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame->a3_ucontext = (UInt)&frame->fake_ucontext; /* oh well */ 175ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_TRACK( post_mem_write, Vg_CoreSignal, tid, 176ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown (Addr)frame, 4*sizeof(UInt) ); 177ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_TRACK( post_mem_write, Vg_CoreSignal, tid, 178ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown (Addr)&frame->fake_siginfo, sizeof(frame->fake_siginfo)); 179ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_TRACK( post_mem_write, Vg_CoreSignal, tid, 180ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown (Addr)&frame->fake_ucontext, sizeof(frame->fake_ucontext)); 181ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 182ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (VG_(clo_trace_signals)) 183ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(message)(Vg_DebugMsg, 184ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown "sigframe_create (thread %d): next EIP=%#lx, next ESP=%#lx", 185ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown tid, (Addr)handler, (Addr)frame ); 186ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 187ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 188ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 189ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* Remove a signal frame from thread 'tid's stack, and restore the CPU 190ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown state from it. Note, isRT is irrelevant here. */ 191ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid VG_(sigframe_destroy)( ThreadId tid, Bool isRT ) 192ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 193ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ThreadState *tst; 194ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Addr esp; 195ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int sigNo; 196ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown struct hacky_sigframe* frame; 197ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 198ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown vg_assert(VG_(is_valid_tid)(tid)); 199ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown tst = VG_(get_ThreadState)(tid); 200ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 201ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* Check that the stack frame looks valid */ 202ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown esp = VG_(get_SP)(tid); 203ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 204ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* why -4 ? because the signal handler's return will have popped 205ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown the return address of the stack; and the return address is the 206ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown lowest-addressed element of hacky_sigframe. */ 207ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame = (struct hacky_sigframe*)(esp - 4); 208ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown vg_assert(frame->magicPI == 0x31415927); 209ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown vg_assert(VG_IS_16_ALIGNED(frame)); 210ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 211ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* restore the entire guest state, and shadows, from the 212ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown frame. Note, as per comments above, this is a kludge - should 213ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown restore it from saved ucontext. Oh well. */ 214ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown tst->arch.vex = frame->gst; 215ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown tst->arch.vex_shadow1 = frame->gshadow1; 216ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown tst->arch.vex_shadow2 = frame->gshadow2; 217ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown tst->sig_mask = frame->mask; 218ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown tst->tmp_sig_mask = frame->mask; 219ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sigNo = frame->sigNo_private; 220ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 221ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (VG_(clo_trace_signals)) 222ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(message)(Vg_DebugMsg, 223ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown "sigframe_destroy (thread %d): valid magic; next EIP=%#x", 224ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown tid, tst->arch.vex.guest_EIP); 225ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 226ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_TRACK( die_mem_stack_signal, 227ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown (Addr)frame - VG_STACK_REDZONE_SZB, 228ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sizeof(struct hacky_sigframe) ); 229ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 230ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* tell the tools */ 231ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_TRACK( post_deliver_signal, tid, sigNo ); 232ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 233ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 234ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif // defined(VGP_x86_darwin) 235ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 236ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 237ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- end ---*/ 238ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 239