1 2/*--------------------------------------------------------------------*/ 3/*--- The core dispatch loop, for jumping to a code address. ---*/ 4/*--- dispatch-x86-solaris.S ---*/ 5/*--------------------------------------------------------------------*/ 6 7/* 8 This file is part of Valgrind, a dynamic binary instrumentation 9 framework. 10 11 Copyright (C) 2012-2017 Petr Pavlu 12 setup@dagobah.cz 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, write to the Free Software 26 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 27 02111-1307, USA. 28 29 The GNU General Public License is contained in the file COPYING. 30*/ 31 32#include "pub_core_basics_asm.h" 33 34#if defined(VGP_x86_solaris) 35 36#include "pub_core_dispatch_asm.h" 37#include "pub_core_transtab_asm.h" 38#include "libvex_guest_offsets.h" /* for OFFSET_x86_EIP */ 39 40 41/*------------------------------------------------------------*/ 42/*--- ---*/ 43/*--- The dispatch loop. VG_(disp_run_translations) is ---*/ 44/*--- used to run all translations, ---*/ 45/*--- including no-redir ones. ---*/ 46/*--- ---*/ 47/*------------------------------------------------------------*/ 48 49/*----------------------------------------------------*/ 50/*--- Entry and preamble (set everything up) ---*/ 51/*----------------------------------------------------*/ 52 53/* signature: 54void VG_(disp_run_translations)( UWord* two_words, 55 void* guest_state, 56 Addr host_addr ); 57*/ 58.text 59.globl VG_(disp_run_translations) 60.type VG_(disp_run_translations), @function 61VG_(disp_run_translations): 62 /* 0(%esp) holds our return address. */ 63 /* 4(%esp) holds two_words */ 64 /* 8(%esp) holds guest_state */ 65 /* 12(%esp) holds host_addr */ 66 67 /* The preamble */ 68 69 /* Save integer registers, since this is a pseudo-function. */ 70 pushl %eax 71 pushl %ebx 72 pushl %ecx 73 pushl %edx 74 pushl %esi 75 pushl %edi 76 pushl %ebp 77 78 /* 28+4(%esp) holds two_words */ 79 /* 28+8(%esp) holds guest_state */ 80 /* 28+12(%esp) holds host_addr */ 81 82 /* Get the host CPU in the state expected by generated code. */ 83 84 /* set host FPU control word to the default mode expected 85 by VEX-generated code. See comments in libvex.h for 86 more info. */ 87 finit 88 pushl $0x027F 89 fldcw (%esp) 90 addl $4, %esp 91 92 /* set host SSE control word to the default mode expected 93 by VEX-generated code. */ 94 cmpl $0, VG_(machine_x86_have_mxcsr) 95 jz L1 96 pushl $0x1F80 97 ldmxcsr (%esp) 98 addl $4, %esp 99L1: 100 /* set dir flag to known value */ 101 cld 102 103 /* Set up the guest state pointer */ 104 movl 28+8(%esp), %ebp 105 106 /* and jump into the code cache. Chained translations in 107 the code cache run, until for whatever reason, they can't 108 continue. When that happens, the translation in question 109 will jump (or call) to one of the continuation points 110 VG_(cp_...) below. */ 111 jmpl *28+12(%esp) 112 /*NOTREACHED*/ 113 114/*----------------------------------------------------*/ 115/*--- Postamble and exit. ---*/ 116/*----------------------------------------------------*/ 117 118postamble: 119 /* At this point, %eax and %edx contain two 120 words to be returned to the caller. %eax 121 holds a TRC value, and %edx optionally may 122 hold another word (for CHAIN_ME exits, the 123 address of the place to patch.) */ 124 125 /* We're leaving. Check that nobody messed with %mxcsr 126 or %fpucw. We can't mess with %eax or %edx here as they 127 holds the tentative return value, but any others are OK. */ 128#if !defined(ENABLE_INNER) 129 /* This check fails for self-hosting, so skip in that case */ 130 pushl $0 131 fstcw (%esp) 132 cmpl $0x027F, (%esp) 133 popl %esi /* get rid of the word without trashing %eflags */ 134 jnz invariant_violation 135#endif 136# cmpl $0, VG_(machine_x86_have_mxcsr) 137 jz L2 138 pushl $0 139 stmxcsr (%esp) 140 andl $0xFFFFFFC0, (%esp) /* mask out status flags */ 141 cmpl $0x1F80, (%esp) 142 popl %esi 143 jnz invariant_violation 144L2: /* otherwise we're OK */ 145 jmp remove_frame 146invariant_violation: 147 movl $VG_TRC_INVARIANT_FAILED, %eax 148 movl $0, %edx 149 150remove_frame: 151 /* Stash return values */ 152 movl 28+4(%esp), %edi /* two_words */ 153 movl %eax, 0(%edi) 154 movl %edx, 4(%edi) 155 /* Restore int regs and return. */ 156 popl %ebp 157 popl %edi 158 popl %esi 159 popl %edx 160 popl %ecx 161 popl %ebx 162 popl %eax 163 ret 164 165/*----------------------------------------------------*/ 166/*--- Continuation points ---*/ 167/*----------------------------------------------------*/ 168 169/* ------ Chain me to slow entry point ------ */ 170.global VG_(disp_cp_chain_me_to_slowEP) 171VG_(disp_cp_chain_me_to_slowEP): 172 /* We got called. The return address indicates 173 where the patching needs to happen. Collect 174 the return address and, exit back to C land, 175 handing the caller the pair (Chain_me_S, RA) */ 176 movl $VG_TRC_CHAIN_ME_TO_SLOW_EP, %eax 177 popl %edx 178 /* 5 = movl $VG_(disp_chain_me_to_slowEP), %edx; 179 2 = call *%edx */ 180 subl $5+2, %edx 181 jmp postamble 182 183/* ------ Chain me to fast entry point ------ */ 184.global VG_(disp_cp_chain_me_to_fastEP) 185VG_(disp_cp_chain_me_to_fastEP): 186 /* We got called. The return address indicates 187 where the patching needs to happen. Collect 188 the return address and, exit back to C land, 189 handing the caller the pair (Chain_me_F, RA) */ 190 movl $VG_TRC_CHAIN_ME_TO_FAST_EP, %eax 191 popl %edx 192 /* 5 = movl $VG_(disp_chain_me_to_fastEP), %edx; 193 2 = call *%edx */ 194 subl $5+2, %edx 195 jmp postamble 196 197/* ------ Indirect but boring jump ------ */ 198.global VG_(disp_cp_xindir) 199VG_(disp_cp_xindir): 200 /* Where are we going? */ 201 movl OFFSET_x86_EIP(%ebp), %eax 202 203 /* stats only */ 204 addl $1, VG_(stats__n_xindirs_32) 205 206 /* try a fast lookup in the translation cache */ 207 movl %eax, %ebx /* next guest addr */ 208 andl $VG_TT_FAST_MASK, %ebx /* entry# */ 209 movl 0+VG_(tt_fast)(,%ebx,8), %esi /* .guest */ 210 movl 4+VG_(tt_fast)(,%ebx,8), %edi /* .host */ 211 cmpl %eax, %esi 212 jnz fast_lookup_failed 213 214 /* Found a match. Jump to .host. */ 215 jmp *%edi 216 ud2 /* persuade insn decoders not to speculate past here */ 217 218fast_lookup_failed: 219 /* stats only */ 220 addl $1, VG_(stats__n_xindir_misses_32) 221 222 movl $VG_TRC_INNER_FASTMISS, %eax 223 movl $0, %edx 224 jmp postamble 225 226/* ------ Assisted jump ------ */ 227.global VG_(disp_cp_xassisted) 228VG_(disp_cp_xassisted): 229 /* %ebp contains the TRC */ 230 movl %ebp, %eax 231 movl $0, %edx 232 jmp postamble 233 234/* ------ Event check failed ------ */ 235.global VG_(disp_cp_evcheck_fail) 236VG_(disp_cp_evcheck_fail): 237 movl $VG_TRC_INNER_COUNTERZERO, %eax 238 movl $0, %edx 239 jmp postamble 240 241 242.size VG_(disp_run_translations), .-VG_(disp_run_translations) 243 244#endif // defined(VGP_x86_solaris) 245 246/* Let the linker know we don't need an executable stack */ 247MARK_STACK_NO_EXEC 248 249/*--------------------------------------------------------------------*/ 250/*--- end ---*/ 251/*--------------------------------------------------------------------*/ 252