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dnl x86 calling conventions checking.
dnl Copyright 2000, 2003, 2010 Free Software Foundation, Inc.
dnl
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or
dnl modify it under the terms of the GNU Lesser 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
dnl The GNU MP Library is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
dnl Lesser General Public License for more details.
dnl
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://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)
xorl %eax, %eax
pushl %eax
fstcw (%esp)
popl %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)
popl RETADDR(%ecx)
movl %ebx, SAVE_EBX(%ecx)
movl %ebp, SAVE_EBP(%ecx)
movl %esi, SAVE_ESI(%ecx)
movl %edi, SAVE_EDI(%ecx)
C Values we expect to see unchanged, as per amd64check.c
movl WANT_EBX(%ecx), %ebx
movl WANT_EBP(%ecx), %ebp
movl WANT_ESI(%ecx), %esi
movl 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
movl JUNK_EAX(%ecx), %eax
movl JUNK_EDX(%ecx), %edx
C movl 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)
movl %ebx, EBX(%ecx)
movl %ebp, EBP(%ecx)
movl %esi, ESI(%ecx)
movl %edi, EDI(%ecx)
pushf
popl %ebx
movl %ebx, EFLAGS(%ecx)
movl SAVE_EBX(%ecx), %ebx
movl SAVE_ESI(%ecx), %esi
movl SAVE_EDI(%ecx), %edi
movl SAVE_EBP(%ecx), %ebp
pushl RETADDR(%ecx)
ifdef(`PIC',`
LEA( G(calling_conventions_fenv), %ecx)
fstenv (%ecx)
',`
fstenv G(calling_conventions_fenv)
')
finit
ret
EPILOGUE()
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