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ftmemsim-valgrind/coregrind/m_dispatch/dispatch-amd64-darwin.S
Nicholas Nethercote 07045477ca Merge the DARWIN branch onto the trunk. 
I tried using 'svn merge' to do the merge but it did a terrible job and
there were bazillions of conflicts.  So instead I just took the diff between
the branch and trunk  at r10155, applied the diff to the trunk, 'svn add'ed
the added files (no files needed to be 'svn remove'd) and committed.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@10156
2009-05-28 01:53:07 +00:00

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/*--------------------------------------------------------------------*/
/*--- The core dispatch loop, for jumping to a code address. ---*/
/*--- dispatch-amd64-darwin.S ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2007 Julian Seward
jseward@acm.org
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#include "pub_core_basics_asm.h"
#include "pub_core_dispatch_asm.h"
#include "pub_core_transtab_asm.h"
#include "libvex_guest_offsets.h" /* for OFFSET_amd64_RIP */
/*------------------------------------------------------------*/
/*--- ---*/
/*--- The dispatch loop. VG_(run_innerloop) is used to ---*/
/*--- run all translations except no-redir ones. ---*/
/*--- ---*/
/*------------------------------------------------------------*/
/*----------------------------------------------------*/
/*--- Preamble (set everything up) ---*/
/*----------------------------------------------------*/
/* signature:
UWord VG_(run_innerloop) ( void* guest_state, UWord do_profiling );
*/
.text
.globl VG_(run_innerloop)
VG_(run_innerloop):
/* %rdi holds guest_state */
/* %rsi holds do_profiling */
/* ----- entry point to VG_(run_innerloop) ----- */
pushq %rbx
pushq %rcx
pushq %rdx
pushq %rsi
pushq %rbp
pushq %r8
pushq %r9
pushq %r10
pushq %r11
pushq %r12
pushq %r13
pushq %r14
pushq %r15
pushq %rdi /* guest_state */
movq VG_(dispatch_ctr)@GOTPCREL(%rip), %r15
movl (%r15), %r15d
pushq %r15
/* 8(%rsp) holds cached copy of guest_state ptr */
/* 0(%rsp) holds cached copy of VG_(dispatch_ctr) */
/* Set up the guest state pointer */
movq %rdi, %rbp
/* fetch %RIP into %rax */
movq OFFSET_amd64_RIP(%rbp), %rax
/* set host FPU control word to the default mode expected
by VEX-generated code. See comments in libvex.h for
more info. */
finit
pushq $0x027F
fldcw (%rsp)
addq $8, %rsp
/* set host SSE control word to the default mode expected
by VEX-generated code. */
pushq $0x1F80
ldmxcsr (%rsp)
addq $8, %rsp
/* set dir flag to known value */
cld
/* fall into main loop (the right one) */
cmpq $0, %rsi
je VG_(run_innerloop__dispatch_unprofiled)
jmp VG_(run_innerloop__dispatch_profiled)
/*NOTREACHED*/
/*----------------------------------------------------*/
/*--- NO-PROFILING (standard) dispatcher ---*/
/*----------------------------------------------------*/
.align 4
.globl VG_(run_innerloop__dispatch_unprofiled)
VG_(run_innerloop__dispatch_unprofiled):
/* AT ENTRY: %rax is next guest addr, %rbp is possibly
modified guest state ptr */
/* Has the guest state pointer been messed with? If yes, exit. */
cmpq 8(%rsp), %rbp
movq VG_(tt_fast)@GOTPCREL(%rip), %rcx
jnz gsp_changed
/* save the jump address in the guest state */
movq %rax, OFFSET_amd64_RIP(%rbp)
/* Are we out of timeslice? If yes, defer to scheduler. */
subl $1, 0(%rsp)
jz counter_is_zero
/* try a fast lookup in the translation cache */
movq %rax, %rbx
andq $VG_TT_FAST_MASK, %rbx /* entry# */
shlq $4, %rbx /* entry# * sizeof(FastCacheEntry) */
movq 0(%rcx,%rbx,1), %r10 /* .guest */
movq 8(%rcx,%rbx,1), %r11 /* .host */
cmpq %rax, %r10
jnz fast_lookup_failed
/* Found a match. Jump to .host. */
jmp *%r11
ud2 /* persuade insn decoders not to speculate past here */
/* generated code should run, then jump back to
VG_(run_innerloop__dispatch_unprofiled). */
/*NOTREACHED*/
/*----------------------------------------------------*/
/*--- PROFILING dispatcher (can be much slower) ---*/
/*----------------------------------------------------*/
.align 4
.globl VG_(run_innerloop__dispatch_profiled)
VG_(run_innerloop__dispatch_profiled):
/* AT ENTRY: %rax is next guest addr, %rbp is possibly
modified guest state ptr */
/* Has the guest state pointer been messed with? If yes, exit. */
cmpq 8(%rsp), %rbp
movq VG_(tt_fast)@GOTPCREL(%rip), %rcx
jnz gsp_changed
/* save the jump address in the guest state */
movq %rax, OFFSET_amd64_RIP(%rbp)
/* Are we out of timeslice? If yes, defer to scheduler. */
subl $1, 0(%rsp)
jz counter_is_zero
/* try a fast lookup in the translation cache */
movq %rax, %rbx
andq $VG_TT_FAST_MASK, %rbx /* entry# */
shlq $4, %rbx /* entry# * sizeof(FastCacheEntry) */
movq 0(%rcx,%rbx,1), %r10 /* .guest */
movq 8(%rcx,%rbx,1), %r11 /* .host */
cmpq %rax, %r10
jnz fast_lookup_failed
/* increment bb profile counter */
movq VG_(tt_fastN)@GOTPCREL(%rip), %rdx
shrq $1, %rbx /* entry# * sizeof(UInt*) */
movq (%rdx,%rbx,1), %rdx
addl $1, (%rdx)
/* Found a match. Jump to .host. */
jmp *%r11
ud2 /* persuade insn decoders not to speculate past here */
/* generated code should run, then jump back to
VG_(run_innerloop__dispatch_profiled). */
/*NOTREACHED*/
/*----------------------------------------------------*/
/*--- exit points ---*/
/*----------------------------------------------------*/
gsp_changed:
/* Someone messed with the gsp. Have to
defer to scheduler to resolve this. dispatch ctr
is not yet decremented, so no need to increment. */
/* %RIP is NOT up to date here. First, need to write
%rax back to %RIP, but without trashing %rbp since
that holds the value we want to return to the scheduler.
Hence use %r15 transiently for the guest state pointer. */
movq 8(%rsp), %r15
movq %rax, OFFSET_amd64_RIP(%r15)
movq %rbp, %rax
jmp run_innerloop_exit
/*NOTREACHED*/
counter_is_zero:
/* %RIP is up to date here */
/* back out decrement of the dispatch counter */
addl $1, 0(%rsp)
movq $VG_TRC_INNER_COUNTERZERO, %rax
jmp run_innerloop_exit
fast_lookup_failed:
/* %RIP is up to date here */
/* back out decrement of the dispatch counter */
addl $1, 0(%rsp)
movq $VG_TRC_INNER_FASTMISS, %rax
jmp run_innerloop_exit
/* All exits from the dispatcher go through here. %rax holds
the return value.
*/
run_innerloop_exit:
/* We're leaving. Check that nobody messed with
%mxcsr or %fpucw. We can't mess with %rax here as it
holds the tentative return value, but any other is OK. */
#if !defined(ENABLE_INNER)
/* This check fails for self-hosting, so skip in that case */
pushq $0
fstcw (%rsp)
cmpl $0x027F, (%rsp)
popq %r15 /* get rid of the word without trashing %eflags */
jnz invariant_violation
#endif
pushq $0
stmxcsr (%rsp)
andl $0xFFFFFFC0, (%rsp) /* mask out status flags */
cmpl $0x1F80, (%rsp)
popq %r15
jnz invariant_violation
/* otherwise we're OK */
jmp run_innerloop_exit_REALLY
invariant_violation:
movq $VG_TRC_INVARIANT_FAILED, %rax
jmp run_innerloop_exit_REALLY
run_innerloop_exit_REALLY:
/* restore VG_(dispatch_ctr) */
popq %r14
movq VG_(dispatch_ctr)@GOTPCREL(%rip), %r15
movl %r14d, (%r15)
popq %rdi
popq %r15
popq %r14
popq %r13
popq %r12
popq %r11
popq %r10
popq %r9
popq %r8
popq %rbp
popq %rsi
popq %rdx
popq %rcx
popq %rbx
ret
/*------------------------------------------------------------*/
/*--- ---*/
/*--- A special dispatcher, for running no-redir ---*/
/*--- translations. Just runs the given translation once. ---*/
/*--- ---*/
/*------------------------------------------------------------*/
/* signature:
void VG_(run_a_noredir_translation) ( UWord* argblock );
*/
/* Run a no-redir translation. argblock points to 4 UWords, 2 to carry args
and 2 to carry results:
0: input: ptr to translation
1: input: ptr to guest state
2: output: next guest PC
3: output: guest state pointer afterwards (== thread return code)
*/
.align 4
.globl VG_(run_a_noredir_translation)
VG_(run_a_noredir_translation):
/* Save callee-saves regs */
pushq %rbx
pushq %rbp
pushq %r12
pushq %r13
pushq %r14
pushq %r15
pushq %rdi /* we will need it after running the translation */
movq 8(%rdi), %rbp
jmp *0(%rdi)
/*NOTREACHED*/
ud2
/* If the translation has been correctly constructed, we
should resume at the the following label. */
.globl VG_(run_a_noredir_translation__return_point)
VG_(run_a_noredir_translation__return_point):
popq %rdi
movq %rax, 16(%rdi)
movq %rbp, 24(%rdi)
popq %r15
popq %r14
popq %r13
popq %r12
popq %rbp
popq %rbx
ret
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
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