2 /*--------------------------------------------------------------------*/
3 /*--- The core dispatch loop, for jumping to a code address. ---*/
4 /*--- dispatch-x86-darwin.S ---*/
5 /*--------------------------------------------------------------------*/
8 This file is part of Valgrind, a dynamic binary instrumentation
11 Copyright (C) 2000-2015 Julian Seward
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.
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.
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
29 The GNU General Public License is contained in the file COPYING.
32 #if defined(VGP_x86_darwin)
34 #include "pub_core_basics_asm.h"
35 #include "pub_core_dispatch_asm.h"
36 #include "pub_core_transtab_asm.h"
37 #include "libvex_guest_offsets.h" /* for OFFSET_x86_EIP */
40 /*------------------------------------------------------------*/
42 /*--- The dispatch loop. VG_(disp_run_translations) is ---*/
43 /*--- used to run all translations, ---*/
44 /*--- including no-redir ones. ---*/
46 /*------------------------------------------------------------*/
48 /*----------------------------------------------------*/
49 /*--- Entry and preamble (set everything up) ---*/
50 /*----------------------------------------------------*/
53 void VG_(disp_run_translations)( UWord* two_words,
58 .globl VG_(disp_run_translations)
59 VG_(disp_run_translations):
60 /* 0(%esp) holds our return address. */
61 /* 4(%esp) holds two_words */
62 /* 8(%esp) holds guest_state */
63 /* 12(%esp) holds host_addr */
67 /* Save integer registers, since this is a pseudo-function. */
76 /* 28+4(%esp) holds two_words */
77 /* 28+8(%esp) holds guest_state */
78 /* 28+12(%esp) holds host_addr */
80 /* Get the host CPU in the state expected by generated code. */
82 /* set host FPU control word to the default mode expected
83 by VEX-generated code. See comments in libvex.h for
90 /* set host SSE control word to the default mode expected
91 by VEX-generated code. */
92 cmpl $0, VG_(machine_x86_have_mxcsr)
98 /* set dir flag to known value */
101 /* Set up the guest state pointer */
102 movl 28+8(%esp), %ebp
104 /* and jump into the code cache. Chained translations in
105 the code cache run, until for whatever reason, they can't
106 continue. When that happens, the translation in question
107 will jump (or call) to one of the continuation points
108 VG_(cp_...) below. */
112 /*----------------------------------------------------*/
113 /*--- Postamble and exit. ---*/
114 /*----------------------------------------------------*/
117 /* At this point, %eax and %edx contain two
118 words to be returned to the caller. %eax
119 holds a TRC value, and %edx optionally may
120 hold another word (for CHAIN_ME exits, the
121 address of the place to patch.) */
123 /* We're leaving. Check that nobody messed with %mxcsr
124 or %fpucw. We can't mess with %eax or %edx here as they
125 holds the tentative return value, but any others are OK. */
126 #if !defined(ENABLE_INNER)
127 /* This check fails for self-hosting, so skip in that case */
131 popl %esi /* get rid of the word without trashing %eflags */
132 jnz invariant_violation
134 # cmpl $0, VG_(machine_x86_have_mxcsr)
138 andl $0xFFFFFFC0, (%esp) /* mask out status flags */
141 jnz invariant_violation
142 L2: /* otherwise we're OK */
145 movl $VG_TRC_INVARIANT_FAILED, %eax
149 /* Stash return values */
150 movl 28+4(%esp), %edi /* two_words */
153 /* Restore int regs and return. */
163 /*----------------------------------------------------*/
164 /*--- Continuation points ---*/
165 /*----------------------------------------------------*/
167 /* ------ Chain me to slow entry point ------ */
168 .globl VG_(disp_cp_chain_me_to_slowEP)
169 VG_(disp_cp_chain_me_to_slowEP):
170 /* We got called. The return address indicates
171 where the patching needs to happen. Collect
172 the return address and, exit back to C land,
173 handing the caller the pair (Chain_me_S, RA) */
174 movl $VG_TRC_CHAIN_ME_TO_SLOW_EP, %eax
176 /* 5 = movl $VG_(disp_chain_me_to_slowEP), %edx;
181 /* ------ Chain me to fast entry point ------ */
182 .globl VG_(disp_cp_chain_me_to_fastEP)
183 VG_(disp_cp_chain_me_to_fastEP):
184 /* We got called. The return address indicates
185 where the patching needs to happen. Collect
186 the return address and, exit back to C land,
187 handing the caller the pair (Chain_me_F, RA) */
188 movl $VG_TRC_CHAIN_ME_TO_FAST_EP, %eax
190 /* 5 = movl $VG_(disp_chain_me_to_fastEP), %edx;
195 /* ------ Indirect but boring jump ------ */
196 .globl VG_(disp_cp_xindir)
198 /* Where are we going? */
199 movl OFFSET_x86_EIP(%ebp), %eax
202 addl $1, VG_(stats__n_xindirs_32)
204 /* try a fast lookup in the translation cache */
205 movl %eax, %ebx /* next guest addr */
206 andl $VG_TT_FAST_MASK, %ebx /* entry# */
207 movl 0+VG_(tt_fast)(,%ebx,8), %esi /* .guest */
208 movl 4+VG_(tt_fast)(,%ebx,8), %edi /* .host */
210 jnz fast_lookup_failed
212 /* Found a match. Jump to .host. */
214 ud2 /* persuade insn decoders not to speculate past here */
218 addl $1, VG_(stats__n_xindir_misses_32)
220 movl $VG_TRC_INNER_FASTMISS, %eax
224 /* ------ Assisted jump ------ */
225 .globl VG_(disp_cp_xassisted)
226 VG_(disp_cp_xassisted):
227 /* %ebp contains the TRC */
232 /* ------ Event check failed ------ */
233 .globl VG_(disp_cp_evcheck_fail)
234 VG_(disp_cp_evcheck_fail):
235 movl $VG_TRC_INNER_COUNTERZERO, %eax
240 #endif // defined(VGP_x86_darwin)
242 /*--------------------------------------------------------------------*/
244 /*--------------------------------------------------------------------*/