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dnl x86 calling conventions checking.
dnl Copyright 2000, 2003, 2010, 2013 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library test suite.
dnl The GNU MP Library test suite is free software; you can redistribute it
dnl and/or modify it under the terms of the GNU General Public License as
dnl published by the Free Software Foundation; either version 3 of the
dnl License, or (at your option) any later version.
dnl The GNU MP Library test suite is distributed in the hope that it will be
dnl useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
dnl Public License for more details.
dnl You should have received a copy of the GNU General Public License along
dnl with the GNU MP Library test suite. If not, see
dnl https://www.gnu.org/licenses/.
dnl The current version of the code attempts to keep the call/return
dnl prediction stack valid, but matching calls and returns.
include(`../config.m4')
C void x86_fldcw (unsigned short cw);
C
C Execute an fldcw, setting the x87 control word to cw.
PROLOGUE(x86_fldcw)
fldcw 4(%esp)
ret
EPILOGUE()
C unsigned short x86_fstcw (void);
C
C Execute an fstcw, returning the current x87 control word.
PROLOGUE(x86_fstcw)
xor %eax, %eax
push %eax
fstcw (%esp)
pop %eax
ret
EPILOGUE()
dnl Instrumented profiling doesn't come out quite right below, since we don't
dnl do an actual "ret". There's only a few instructions here, so there's no
dnl great need to get them separately accounted, just let them get attributed
dnl to the caller. FIXME this comment might no longer be true.
ifelse(WANT_PROFILING,instrument,
`define(`WANT_PROFILING',no)')
C int calling_conventions (...);
C
C The global variable "calling_conventions_function" is the function to
C call, with the arguments as passed here.
C
C Perhaps the finit should be done only if the tags word isn't clear, but
C nothing uses the rounding mode or anything at the moment.
define(`WANT_EBX', eval(4*0)($1))
define(`WANT_EBP', eval(4*1)($1))
define(`WANT_ESI', eval(4*2)($1))
define(`WANT_EDI', eval(4*3)($1))
define(`JUNK_EAX', eval(4*4)($1))
define(`JUNK_ECX', eval(4*5)($1))
define(`JUNK_EDX', eval(4*6)($1))
define(`SAVE_EBX', eval(4*7)($1))
define(`SAVE_EBP', eval(4*8)($1))
define(`SAVE_ESI', eval(4*9)($1))
define(`SAVE_EDI', eval(4*10)($1))
define(`RETADDR', eval(4*11)($1))
define(`EBX', eval(4*12)($1))
define(`EBP', eval(4*13)($1))
define(`ESI', eval(4*14)($1))
define(`EDI', eval(4*15)($1))
define(`EFLAGS', eval(4*16)($1))
define(G,
m4_assert_numargs(1)
`GSYM_PREFIX`'$1')
TEXT
ALIGN(8)
PROLOGUE(calling_conventions)
LEA( G(calling_conventions_values), %ecx)
pop RETADDR(%ecx)
mov %ebx, SAVE_EBX(%ecx)
mov %ebp, SAVE_EBP(%ecx)
mov %esi, SAVE_ESI(%ecx)
mov %edi, SAVE_EDI(%ecx)
C Values we expect to see unchanged, as per amd64check.c
mov WANT_EBX(%ecx), %ebx
mov WANT_EBP(%ecx), %ebp
mov WANT_ESI(%ecx), %esi
mov WANT_EDI(%ecx), %edi
C Try to provoke a problem by starting with junk in the caller-saves
C registers, especially in %eax and %edx which will be return values
mov JUNK_EAX(%ecx), %eax
mov JUNK_EDX(%ecx), %edx
C mov JUNK_ECX(%ecx), %ecx
ifdef(`PIC',`
LEA( G(calling_conventions_function), %ecx)
call *(%ecx)
',`
call *G(calling_conventions_function)
')
LEA( G(calling_conventions_values), %ecx)
mov %ebx, EBX(%ecx)
mov %ebp, EBP(%ecx)
mov %esi, ESI(%ecx)
mov %edi, EDI(%ecx)
pushf
pop %ebx
mov %ebx, EFLAGS(%ecx)
mov SAVE_EBX(%ecx), %ebx
mov SAVE_ESI(%ecx), %esi
mov SAVE_EDI(%ecx), %edi
mov SAVE_EBP(%ecx), %ebp
push RETADDR(%ecx)
ifdef(`PIC',`
LEA( G(calling_conventions_fenv), %ecx)
fstenv (%ecx)
',`
fstenv G(calling_conventions_fenv)
')
finit
ret
EPILOGUE()
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