2008-04-17 17:03:07 -04:00
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dnl x86 calling conventions checking.
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dnl Copyright 2000, 2003 Free Software Foundation, Inc.
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dnl
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or
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dnl modify it under the terms of the GNU Lesser General Public License as
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dnl published by the Free Software Foundation; either version 2.1 of the
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dnl License, or (at your option) any later version.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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dnl Lesser General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU Lesser General Public
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dnl License along with the GNU MP Library; see the file COPYING.LIB. If
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dnl not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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dnl Fifth Floor, Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C void x86_fldcw (unsigned short cw);
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C
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C Execute an fldcw, setting the x87 control word to cw.
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PROLOGUE(x86_fldcw)
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fldcw 4(%esp)
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ret
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EPILOGUE()
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C unsigned short x86_fstcw (void);
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C
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C Execute an fstcw, returning the current x87 control word.
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PROLOGUE(x86_fstcw)
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xorl %eax, %eax
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pushl %eax
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fstcw (%esp)
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popl %eax
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ret
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EPILOGUE()
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dnl Instrumented profiling doesn't come out quite right below, since we
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dnl don't do an actual "ret". There's only a few instructions here, so
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dnl there's no great need to get them separately accounted, just let them
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dnl get attributed to the caller.
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ifelse(WANT_PROFILING,instrument,
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`define(`WANT_PROFILING',no)')
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C int calling_conventions (...);
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C
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C The global variable "calling_conventions_function" is the function to
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C call, with the arguments as passed here.
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C
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C Perhaps the finit should be done only if the tags word isn't clear, but
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C nothing uses the rounding mode or anything at the moment.
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define(G,
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m4_assert_numargs(1)
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`GSYM_PREFIX`'$1')
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.text
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ALIGN(8)
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PROLOGUE(calling_conventions)
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movl (%esp), %eax
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movl %eax, G(calling_conventions_retaddr)
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movl $L(return), (%esp)
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movl %ebx, G(calling_conventions_save_ebx)
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movl %esi, G(calling_conventions_save_esi)
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movl %edi, G(calling_conventions_save_edi)
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movl %ebp, G(calling_conventions_save_ebp)
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movl $0x01234567, %ebx
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movl $0x89ABCDEF, %esi
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movl $0xFEDCBA98, %edi
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movl $0x76543210, %ebp
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C try to provoke a problem by starting with junk in the registers,
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C especially in %eax and %edx which will be return values
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movl $0x70246135, %eax
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movl $0x8ACE9BDF, %ecx
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movl $0xFDB97531, %edx
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jmp *G(calling_conventions_function)
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L(return):
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movl %ebx, G(calling_conventions_ebx)
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movl %esi, G(calling_conventions_esi)
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movl %edi, G(calling_conventions_edi)
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movl %ebp, G(calling_conventions_ebp)
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pushf
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popl %ebx
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movl %ebx, G(calling_conventions_eflags)
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fstenv G(calling_conventions_fenv)
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finit
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movl G(calling_conventions_save_ebx), %ebx
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movl G(calling_conventions_save_esi), %esi
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movl G(calling_conventions_save_edi), %edi
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movl G(calling_conventions_save_ebp), %ebp
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jmp *G(calling_conventions_retaddr)
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EPILOGUE()
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2009-04-11 00:14:25 -04:00
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C void gmp_x86check_workaround_apple_ld_bug()
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C
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C Apple ld has an annoying bug that causes it to only load members from
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C static archives that satisfy text symbol dependencies. This procedure
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C creates a bogus dependency on a text symbol in x86check.o (in libtests.a)
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C to ensure that ld loads it, also making all of the needed non-text
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C symbols available.
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PROLOGUE(gmp_x86check_workaround_apple_ld_bug)
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jmp *G(calling_conventions_check)
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EPILOGUE()
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