coregrind/m_sigframe/sigframe-mips64-linux.c

   1
   2 /*--------------------------------------------------------------------*/
   3 /*--- Create/destroy signal delivery frames.                       ---*/
   4 /*---                                  sigframe-mips64-linux.c     ---*/
   5 /*--------------------------------------------------------------------*/
   6
   7 /*
   8    This file is part of Valgrind, a dynamic binary instrumentation
   9    framework.
  10
  11    Copyright (C) 2010-2017 RT-RK
  12       mips-valgrind@rt-rk.com
  13
  14    This program is free software; you can redistribute it and/or
  15    modify it under the terms of the GNU General Public License as
  16    published by the Free Software Foundation; either version 2 of the
  17    License, or (at your option) any later version.
  18
  19    This program is distributed in the hope that it will be useful, but
  20    WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22    General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program; if not, see <http://www.gnu.org/licenses/>.
  26
  27    The GNU General Public License is contained in the file COPYING.
  28 */
  29
  30 #if defined(VGP_mips64_linux)
  31
  32 #include "pub_core_basics.h"
  33 #include "pub_core_vki.h"
  34 #include "pub_core_vkiscnums.h"
  35 #include "pub_core_threadstate.h"
  36 #include "pub_core_aspacemgr.h"
  37 #include "pub_core_libcbase.h"
  38 #include "pub_core_libcassert.h"
  39 #include "pub_core_libcprint.h"
  40 #include "pub_core_machine.h"
  41 #include "pub_core_options.h"
  42 #include "pub_core_sigframe.h"
  43 #include "pub_core_signals.h"
  44 #include "pub_core_tooliface.h"
  45 #include "pub_core_trampoline.h"
  46 #include "priv_sigframe.h"
  47
  48 struct vg_sig_private {
  49    UInt magicPI;
  50    UInt sigNo_private;
  51    VexGuestMIPS64State vex_shadow1;
  52    VexGuestMIPS64State vex_shadow2;
  53 };
  54
  55 struct sigframe {
  56    UInt sf_ass[4];  /* argument save space for o32 */
  57    UInt sf_pad[2];  /* Was: signal trampoline */
  58    struct vki_sigcontext sf_sc;
  59    vki_sigset_t sf_mask;
  60    struct vg_sig_private priv;
  61 };
  62
  63 struct rt_sigframe {
  64    UInt rs_ass[4];  /* argument save space for o32 */
  65    UInt rs_pad[2];  /* Was: signal trampoline */
  66    vki_siginfo_t rs_info;
  67    struct vki_ucontext rs_uc;
  68    struct vg_sig_private priv;
  69 };
  70
  71
  72 static void setup_sigcontext ( ThreadState* tst, struct vki_sigcontext **sc1,
  73                                const vki_siginfo_t *si)
  74 {
  75    struct vki_sigcontext *sc = *sc1;
  76
  77    VG_TRACK(pre_mem_write, Vg_CoreSignal, tst->tid, "signal frame mcontext",
  78             (Addr)sc, sizeof(unsigned long long)*34);
  79    sc->sc_regs[1] = tst->arch.vex.guest_r1;
  80    sc->sc_regs[2] = tst->arch.vex.guest_r2;
  81    sc->sc_regs[3] = tst->arch.vex.guest_r3;
  82    sc->sc_regs[4] = tst->arch.vex.guest_r4;
  83    sc->sc_regs[5] = tst->arch.vex.guest_r5;
  84    sc->sc_regs[6] = tst->arch.vex.guest_r6;
  85    sc->sc_regs[7] = tst->arch.vex.guest_r7;
  86    sc->sc_regs[8] = tst->arch.vex.guest_r8;
  87    sc->sc_regs[9] = tst->arch.vex.guest_r9;
  88    sc->sc_regs[10] = tst->arch.vex.guest_r10;
  89    sc->sc_regs[11] = tst->arch.vex.guest_r11;
  90    sc->sc_regs[12] = tst->arch.vex.guest_r12;
  91    sc->sc_regs[13] = tst->arch.vex.guest_r13;
  92    sc->sc_regs[14] = tst->arch.vex.guest_r14;
  93    sc->sc_regs[15] = tst->arch.vex.guest_r15;
  94    sc->sc_regs[16] = tst->arch.vex.guest_r16;
  95    sc->sc_regs[17] = tst->arch.vex.guest_r17;
  96    sc->sc_regs[18] = tst->arch.vex.guest_r18;
  97    sc->sc_regs[19] = tst->arch.vex.guest_r19;
  98    sc->sc_regs[20] = tst->arch.vex.guest_r20;
  99    sc->sc_regs[21] = tst->arch.vex.guest_r21;
 100    sc->sc_regs[22] = tst->arch.vex.guest_r22;
 101    sc->sc_regs[23] = tst->arch.vex.guest_r23;
 102    sc->sc_regs[24] = tst->arch.vex.guest_r24;
 103    sc->sc_regs[25] = tst->arch.vex.guest_r25;
 104    sc->sc_regs[26] = tst->arch.vex.guest_r26;
 105    sc->sc_regs[27] = tst->arch.vex.guest_r27;
 106    sc->sc_regs[28] = tst->arch.vex.guest_r28;
 107    sc->sc_regs[29] = tst->arch.vex.guest_r29;
 108    sc->sc_regs[30] = tst->arch.vex.guest_r30;
 109    sc->sc_regs[31] = tst->arch.vex.guest_r31;
 110    sc->sc_pc = tst->arch.vex.guest_PC;
 111    sc->sc_mdhi = tst->arch.vex.guest_HI;
 112    sc->sc_mdlo = tst->arch.vex.guest_LO;
 113 }
 114
 115 /* EXPORTED */
 116 void VG_(sigframe_create) ( ThreadId tid,
 117                             Bool on_altstack,
 118                             Addr sp_top_of_frame,
 119                             const vki_siginfo_t *siginfo,
 120                             const struct vki_ucontext *siguc,
 121                             void *handler,
 122                             UInt flags,
 123                             const vki_sigset_t *mask,
 124                             void *restorer )
 125 {
 126    Addr sp;
 127    ThreadState* tst = VG_(get_ThreadState)(tid);
 128    Int sigNo = siginfo->si_signo;
 129    struct vg_sig_private *priv;
 130    /* Stack must be 16-byte aligned */
 131    sp_top_of_frame &= ~0xf;
 132
 133    sp = sp_top_of_frame - sizeof(struct rt_sigframe);
 134
 135    tst = VG_(get_ThreadState)(tid);
 136    if (! ML_(sf_maybe_extend_stack)(tst, sp, sp_top_of_frame - sp, flags))
 137       return;
 138
 139    sp = VG_ROUNDDN(sp, 16);
 140
 141    struct rt_sigframe *frame = (struct rt_sigframe *)sp;
 142    struct vki_ucontext *ucp = &frame->rs_uc;
 143    if (VG_(clo_trace_signals))
 144       VG_(printf)("rt_sigframe\n");
 145    /* Create siginfo. */
 146    VG_TRACK(pre_mem_write, Vg_CoreSignal, tid, "signal frame siginfo",
 147             (Addr)&frame->rs_info, sizeof(frame->rs_info));
 148
 149    VG_(memcpy)(&frame->rs_info, siginfo, sizeof(*siginfo));
 150
 151    VG_TRACK(post_mem_write, Vg_CoreSignal, tid,
 152             (Addr)&frame->rs_info, sizeof(frame->rs_info));
 153
 154    /* Create the ucontext. */
 155    VG_TRACK(pre_mem_write, Vg_CoreSignal, tid, "signal frame ucontext",
 156             (Addr)ucp, offsetof(struct vki_ucontext, uc_mcontext));
 157
 158    ucp->uc_flags = 0;
 159    ucp->uc_link = 0;
 160    ucp->uc_stack = tst->altstack;
 161
 162    VG_TRACK(post_mem_write, Vg_CoreSignal, tid, (Addr)ucp,
 163             offsetof(struct vki_ucontext, uc_mcontext));
 164
 165    struct vki_sigcontext *scp = &(frame->rs_uc.uc_mcontext);
 166    setup_sigcontext(tst, &(scp), siginfo);
 167    ucp->uc_sigmask = tst->sig_mask;
 168    priv = &frame->priv;
 169
 170    /* Arguments to signal handler:
 171
 172       a0 = signal number
 173       a1 = 0 (should be cause)
 174       a2 = pointer to ucontext
 175
 176       $25 and c0_epc point to the signal handler, $29 points to
 177       the struct rt_sigframe. */
 178
 179    tst->arch.vex.guest_r4 = siginfo->si_signo;
 180    tst->arch.vex.guest_r5 = (Addr) &frame->rs_info;
 181    tst->arch.vex.guest_r6 = (Addr) &frame->rs_uc;
 182    tst->arch.vex.guest_r29 = (Addr) frame;
 183    tst->arch.vex.guest_r25 = (Addr) handler;
 184
 185    if (flags & VKI_SA_RESTORER)
 186       tst->arch.vex.guest_r31 = (Addr) restorer;
 187    else
 188       tst->arch.vex.guest_r31 = (Addr)&VG_(mips64_linux_SUBST_FOR_rt_sigreturn);
 189
 190    priv->magicPI       = 0x31415927;
 191    priv->sigNo_private = sigNo;
 192    priv->vex_shadow1   = tst->arch.vex_shadow1;
 193    priv->vex_shadow2   = tst->arch.vex_shadow2;
 194    /* Set the thread so it will next run the handler. */
 195    VG_TRACK( post_reg_write, Vg_CoreSignal, tid, VG_O_STACK_PTR, sizeof(Addr));
 196    if (VG_(clo_trace_signals))
 197       VG_(printf)("handler = %p\n", handler);
 198    tst->arch.vex.guest_PC = (Addr) handler;
 199    /* This thread needs to be marked runnable, but we leave that
 200       the caller to do. */
 201 }
 202
 203 /* EXPORTED */
 204 void VG_(sigframe_destroy) ( ThreadId tid, Bool isRT )
 205 {
 206    ThreadState *tst;
 207    struct vg_sig_private *priv1;
 208    Addr sp;
 209    UInt frame_size;
 210    struct vki_sigcontext *mc;
 211    Int sigNo;
 212
 213    vg_assert(VG_(is_valid_tid)(tid));
 214    tst = VG_(get_ThreadState)(tid);
 215    sp   = tst->arch.vex.guest_r29;
 216    struct rt_sigframe *frame = (struct rt_sigframe *)sp;
 217    struct vki_ucontext *ucp = &frame->rs_uc;
 218    frame_size = sizeof(*frame);
 219    mc = &ucp->uc_mcontext;
 220    tst->sig_mask = ucp->uc_sigmask;
 221    tst->tmp_sig_mask = ucp->uc_sigmask;
 222    priv1 = &frame->priv;
 223    sigNo = priv1->sigNo_private;
 224    vg_assert(priv1->magicPI == 0x31415927);
 225    /* restore regs */
 226    tst->arch.vex.guest_r1 = mc->sc_regs[1];
 227    tst->arch.vex.guest_r2 = mc->sc_regs[2];
 228    tst->arch.vex.guest_r3 = mc->sc_regs[3];
 229    tst->arch.vex.guest_r4 = mc->sc_regs[4];
 230    tst->arch.vex.guest_r5 = mc->sc_regs[5];
 231    tst->arch.vex.guest_r6 = mc->sc_regs[6];
 232    tst->arch.vex.guest_r7 = mc->sc_regs[7];
 233    tst->arch.vex.guest_r8 = mc->sc_regs[8];
 234    tst->arch.vex.guest_r9 = mc->sc_regs[9];
 235    tst->arch.vex.guest_r10 = mc->sc_regs[10];
 236    tst->arch.vex.guest_r11 = mc->sc_regs[11];
 237    tst->arch.vex.guest_r12 = mc->sc_regs[12];
 238    tst->arch.vex.guest_r13= mc->sc_regs[13];
 239    tst->arch.vex.guest_r14 = mc->sc_regs[14];
 240    tst->arch.vex.guest_r15 = mc->sc_regs[15];
 241    tst->arch.vex.guest_r16 = mc->sc_regs[16];
 242    tst->arch.vex.guest_r17 = mc->sc_regs[17];
 243    tst->arch.vex.guest_r18 = mc->sc_regs[18];
 244    tst->arch.vex.guest_r19 = mc->sc_regs[19];
 245    tst->arch.vex.guest_r20 = mc->sc_regs[20];
 246    tst->arch.vex.guest_r21 = mc->sc_regs[21];
 247    tst->arch.vex.guest_r22 = mc->sc_regs[22];
 248    tst->arch.vex.guest_r23 = mc->sc_regs[23];
 249    tst->arch.vex.guest_r24 = mc->sc_regs[24];
 250    tst->arch.vex.guest_r25 = mc->sc_regs[25];
 251    tst->arch.vex.guest_r26 = mc->sc_regs[26];
 252    tst->arch.vex.guest_r27 = mc->sc_regs[27];
 253    tst->arch.vex.guest_r28 = mc->sc_regs[28];
 254    tst->arch.vex.guest_r30 = mc->sc_regs[30];
 255    tst->arch.vex.guest_PC = mc->sc_pc;
 256    tst->arch.vex.guest_r31 = mc->sc_regs[31];
 257    tst->arch.vex.guest_r29 = mc->sc_regs[29];
 258
 259    tst->arch.vex.guest_HI = mc->sc_mdhi;
 260    tst->arch.vex.guest_LO = mc->sc_mdlo;
 261    tst->arch.vex_shadow1 = priv1->vex_shadow1;
 262    tst->arch.vex_shadow2 = priv1->vex_shadow2;
 263
 264    VG_TRACK(die_mem_stack_signal, sp, frame_size);
 265    if (VG_(clo_trace_signals))
 266       VG_(message)(Vg_DebugMsg,
 267          "VG_(signal_return) (thread %u): isRT=%d valid magic; EIP=%#llx\n",
 268          tid, isRT, tst->arch.vex.guest_PC);
 269    /* tell the tools */
 270    VG_TRACK( post_deliver_signal, tid, sigNo );
 271 }
 272
 273 #endif /* defined(VGP_mips64_linux) */
 274
 275 /*--------------------------------------------------------------------*/
 276 /*--- end                                  sigframe-mips64-linux.c ---*/
 277 /*--------------------------------------------------------------------*/