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https://github.com/Zenithsiz/ftmemsim-valgrind.git
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218 lines
7.4 KiB
ArmAsm
218 lines
7.4 KiB
ArmAsm
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/*--------------------------------------------------------------------*/
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/*--- The core dispatch loop, for jumping to a code address. ---*/
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/*--- dispatch-arm-linux.S ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2008-2017 Evan Geller
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gaze@bea.ms
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#include "pub_core_basics_asm.h"
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#if defined(VGP_arm_linux)
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.fpu vfp
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#include "pub_core_dispatch_asm.h"
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#include "pub_core_transtab_asm.h"
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#include "libvex_guest_offsets.h" /* for OFFSET_arm_R* */
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/*------------------------------------------------------------*/
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/*--- ---*/
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/*--- The dispatch loop. VG_(disp_run_translations) is ---*/
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/*--- used to run all translations, ---*/
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/*--- including no-redir ones. ---*/
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/*--- ---*/
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/*------------------------------------------------------------*/
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/*----------------------------------------------------*/
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/*--- Entry and preamble (set everything up) ---*/
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/*----------------------------------------------------*/
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/* signature:
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void VG_(disp_run_translations)( UWord* two_words,
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void* guest_state,
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Addr host_addr );
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*/
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.text
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.global VG_(disp_run_translations)
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VG_(disp_run_translations):
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/* r0 holds two_words
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r1 holds guest_state
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r2 holds host_addr
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*/
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/* The number of regs in this list needs to be even, in
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order to keep the stack 8-aligned. */
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push {r0, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, lr}
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/* set FPSCR to vex-required default value */
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mov r4, #0
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fmxr fpscr, r4
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/* Set up the guest state pointer */
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mov r8, r1
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/* and jump into the code cache. Chained translations in
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the code cache run, until for whatever reason, they can't
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continue. When that happens, the translation in question
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will jump (or call) to one of the continuation points
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VG_(cp_...) below. */
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bx r2
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/* NOTREACHED */
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/*----------------------------------------------------*/
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/*--- Postamble and exit. ---*/
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/*----------------------------------------------------*/
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postamble:
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/* At this point, r1 and r2 contain two
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words to be returned to the caller. r1
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holds a TRC value, and r2 optionally may
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hold another word (for CHAIN_ME exits, the
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address of the place to patch.) */
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/* We're leaving. Check that nobody messed with
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FPSCR in ways we don't expect. */
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fmrx r4, fpscr
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bic r4, #0xF8000000 /* mask out NZCV and QC */
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bic r4, #0x0000009F /* mask out IDC,IXC,UFC,OFC,DZC,IOC */
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cmp r4, #0
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beq remove_frame /* we're OK */
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/* otherwise we have an invariant violation */
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movw r1, #VG_TRC_INVARIANT_FAILED
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movw r2, #0
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/* fall through */
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remove_frame:
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/* Restore int regs, including importantly r0 (two_words) */
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pop {r0, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, lr}
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/* Stash return values */
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str r1, [r0, #0]
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str r2, [r0, #4]
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bx lr
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/*----------------------------------------------------*/
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/*--- Continuation points ---*/
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/*----------------------------------------------------*/
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/* ------ Chain me to slow entry point ------ */
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.global VG_(disp_cp_chain_me_to_slowEP)
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VG_(disp_cp_chain_me_to_slowEP):
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/* We got called. The return address indicates
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where the patching needs to happen. Collect
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the return address and, exit back to C land,
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handing the caller the pair (Chain_me_S, RA) */
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mov r1, #VG_TRC_CHAIN_ME_TO_SLOW_EP
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mov r2, lr
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/* 4 = movw r12, lo16(disp_cp_chain_me_to_slowEP)
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4 = movt r12, hi16(disp_cp_chain_me_to_slowEP)
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4 = blx r12 */
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sub r2, r2, #4+4+4
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b postamble
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/* ------ Chain me to fast entry point ------ */
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.global VG_(disp_cp_chain_me_to_fastEP)
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VG_(disp_cp_chain_me_to_fastEP):
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/* We got called. The return address indicates
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where the patching needs to happen. Collect
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the return address and, exit back to C land,
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handing the caller the pair (Chain_me_F, RA) */
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mov r1, #VG_TRC_CHAIN_ME_TO_FAST_EP
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mov r2, lr
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/* 4 = movw r12, lo16(disp_cp_chain_me_to_fastEP)
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4 = movt r12, hi16(disp_cp_chain_me_to_fastEP)
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4 = blx r12 */
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sub r2, r2, #4+4+4
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b postamble
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/* ------ Indirect but boring jump ------ */
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.global VG_(disp_cp_xindir)
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VG_(disp_cp_xindir):
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/* Where are we going? */
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ldr r0, [r8, #OFFSET_arm_R15T]
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/* stats only */
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movw r1, #:lower16:vgPlain_stats__n_xindirs_32
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movt r1, #:upper16:vgPlain_stats__n_xindirs_32
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ldr r2, [r1, #0]
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add r2, r2, #1
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str r2, [r1, #0]
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/* try a fast lookup in the translation cache */
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// r0 = next guest, r1,r2,r3,r4 scratch
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movw r1, #VG_TT_FAST_MASK // r1 = VG_TT_FAST_MASK
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movw r4, #:lower16:VG_(tt_fast)
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and r2, r1, r0, LSR #1 // r2 = entry #
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movt r4, #:upper16:VG_(tt_fast) // r4 = &VG_(tt_fast)
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add r1, r4, r2, LSL #3 // r1 = &tt_fast[entry#]
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ldrd r4, r5, [r1, #0] // r4 = .guest, r5 = .host
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cmp r4, r0
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// jump to host if lookup succeeded
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bxeq r5
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/* otherwise the fast lookup failed */
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/* RM ME -- stats only */
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movw r1, #:lower16:vgPlain_stats__n_xindir_misses_32
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movt r1, #:upper16:vgPlain_stats__n_xindir_misses_32
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ldr r2, [r1, #0]
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add r2, r2, #1
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str r2, [r1, #0]
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mov r1, #VG_TRC_INNER_FASTMISS
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mov r2, #0
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b postamble
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/* ------ Assisted jump ------ */
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.global VG_(disp_cp_xassisted)
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VG_(disp_cp_xassisted):
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/* r8 contains the TRC */
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mov r1, r8
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mov r2, #0
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b postamble
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/* ------ Event check failed ------ */
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.global VG_(disp_cp_evcheck_fail)
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VG_(disp_cp_evcheck_fail):
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mov r1, #VG_TRC_INNER_COUNTERZERO
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mov r2, #0
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b postamble
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.size VG_(disp_run_translations), .-VG_(disp_run_translations)
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#endif // defined(VGP_arm_linux)
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/* Let the linker know we don't need an executable stack */
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MARK_STACK_NO_EXEC
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/*--------------------------------------------------------------------*/
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/*--- end dispatch-arm-linux.S ---*/
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/*--------------------------------------------------------------------*/
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