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This refactoring should make it easier to add new calling conventions. 

Replace ffi_call_STDCALL and ffi_call_SYSV by a ffi_call_x86 function
that cleans up the stack when FFI_SYSV is used, and does nothing for
FFI_STDCALL.

Remove libffi_msvc\win32.S, which is out of date and also unused; it
was only used for building ctypes with the MingW compiler.
This commit is contained in:
Thomas Heller 2009-02-03 17:07:40 +00:00
parent 1797b7dbbc
commit 7757d7bb51
3 changed files with 29 additions and 400 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
Modules/_ctypes/libffi_msvc/ffi.c
View File

@ -148,27 +148,12 @@ ffi_status ffi_prep_cif_machdep(ffi_cif *cif)
}
#ifdef _WIN32
/*@-declundef@*/
/*@-exportheader@*/
extern int
ffi_call_SYSV(void (*)(char *, extended_cif *),
/*@out@*/ extended_cif *,
unsigned, unsigned,
/*@out@*/ unsigned *,
void (*fn)());
/*@=declundef@*/
/*@=exportheader@*/
/*@-declundef@*/
/*@-exportheader@*/
extern int
ffi_call_STDCALL(void (*)(char *, extended_cif *),
/*@out@*/ extended_cif *,
unsigned, unsigned,
/*@out@*/ unsigned *,
void (*fn)());
/*@=declundef@*/
/*@=exportheader@*/
ffi_call_x86(void (*)(char *, extended_cif *),
/*@out@*/ extended_cif *,
unsigned, unsigned,
/*@out@*/ unsigned *,
void (*fn)());
#endif
#ifdef _WIN64
@ -209,17 +194,9 @@ ffi_call(/*@dependent@*/ ffi_cif *cif,
{
#if !defined(_WIN64)
case FFI_SYSV:
/*@-usedef@*/
return ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes,
cif->flags, ecif.rvalue, fn);
/*@=usedef@*/
break;
case FFI_STDCALL:
/*@-usedef@*/
return ffi_call_STDCALL(ffi_prep_args, &ecif, cif->bytes,
cif->flags, ecif.rvalue, fn);
/*@=usedef@*/
return ffi_call_x86(ffi_prep_args, &ecif, cif->bytes,
cif->flags, ecif.rvalue, fn);
break;
#else
case FFI_SYSV:

243
Modules/_ctypes/libffi_msvc/win32.S
View File

@ -1,243 +0,0 @@
/* -----------------------------------------------------------------------
win32.S - Copyright (c) 1996, 1998, 2001, 2002 Red Hat, Inc.
Copyright (c) 2001 John Beniton
Copyright (c) 2002 Ranjit Mathew
X86 Foreign Function Interface
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
``Software''), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL CYGNUS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
----------------------------------------------------------------------- */
#define LIBFFI_ASM
#include <fficonfig.h>
#include <ffi.h>
.text
.globl ffi_prep_args
# This assumes we are using gas.
.balign 16
.globl _ffi_call_SYSV
_ffi_call_SYSV:
pushl %ebp
movl %esp,%ebp
#THe: save previous %esi, and store the current stack pointer in %esi
pushl %esi
movl %esp,%esi
# Make room for all of the new args.
movl 16(%ebp),%ecx
subl %ecx,%esp
movl %esp,%eax
# Place all of the ffi_prep_args in position
pushl 12(%ebp)
pushl %eax
call *8(%ebp)
# Return stack to previous state and call the function
addl $8,%esp
# FIXME: Align the stack to a 128-bit boundary to avoid
# potential performance hits.
call *28(%ebp)
# Remove the space we pushed for the args
movl 16(%ebp),%ecx
addl %ecx,%esp
sub %esp,%esi # calculate stack pointer difference
# Load %ecx with the return type code
movl 20(%ebp),%ecx
# If the return value pointer is NULL, assume no return value.
cmpl $0,24(%ebp)
jne retint
# Even if there is no space for the return value, we are
# obliged to handle floating-point values.
cmpl $FFI_TYPE_FLOAT,%ecx
jne noretval
fstp %st(0)
jmp epilogue
retint:
cmpl $FFI_TYPE_INT,%ecx
jne retfloat
# Load %ecx with the pointer to storage for the return value
movl 24(%ebp),%ecx
movl %eax,0(%ecx)
jmp epilogue
retfloat:
cmpl $FFI_TYPE_FLOAT,%ecx
jne retdouble
# Load %ecx with the pointer to storage for the return value
movl 24(%ebp),%ecx
fstps (%ecx)
jmp epilogue
retdouble:
cmpl $FFI_TYPE_DOUBLE,%ecx
jne retlongdouble
# Load %ecx with the pointer to storage for the return value
movl 24(%ebp),%ecx
fstpl (%ecx)
jmp epilogue
retlongdouble:
cmpl $FFI_TYPE_LONGDOUBLE,%ecx
jne retint64
# Load %ecx with the pointer to storage for the return value
movl 24(%ebp),%ecx
fstpt (%ecx)
jmp epilogue
retint64:
cmpl $FFI_TYPE_SINT64,%ecx
jne retstruct
# Load %ecx with the pointer to storage for the return value
movl 24(%ebp),%ecx
movl %eax,0(%ecx)
movl %edx,4(%ecx)
retstruct:
# Nothing to do!
noretval:
epilogue:
movl %esi,%eax # return the stack pointer detlta in %eax
popl %esi # restore previous %esi
movl %ebp,%esp
popl %ebp
ret
.ffi_call_SYSV_end:
# This assumes we are using gas.
.balign 16
.globl _ffi_call_STDCALL
_ffi_call_STDCALL:
pushl %ebp
movl %esp,%ebp
#THe: save previous %esi, and store the current stack pointer in %esi
pushl %esi
movl %esp,%esi
# Make room for all of the new args.
movl 16(%ebp),%ecx
subl %ecx,%esp
movl %esp,%eax
# Place all of the ffi_prep_args in position
pushl 12(%ebp)
pushl %eax
call *8(%ebp)
# Return stack to previous state and call the function
addl $8,%esp
# FIXME: Align the stack to a 128-bit boundary to avoid
# potential performance hits.
call *28(%ebp)
sub %esp,%esi # difference in stack
# stdcall functions pop arguments off the stack themselves
# Load %ecx with the return type code
movl 20(%ebp),%ecx
# If the return value pointer is NULL, assume no return value.
cmpl $0,24(%ebp)
jne sc_retint
# Even if there is no space for the return value, we are
# obliged to handle floating-point values.
cmpl $FFI_TYPE_FLOAT,%ecx
jne sc_noretval
fstp %st(0)
jmp sc_epilogue
sc_retint:
cmpl $FFI_TYPE_INT,%ecx
jne sc_retfloat
# Load %ecx with the pointer to storage for the return value
movl 24(%ebp),%ecx
movl %eax,0(%ecx)
jmp sc_epilogue
sc_retfloat:
cmpl $FFI_TYPE_FLOAT,%ecx
jne sc_retdouble
# Load %ecx with the pointer to storage for the return value
movl 24(%ebp),%ecx
fstps (%ecx)
jmp sc_epilogue
sc_retdouble:
cmpl $FFI_TYPE_DOUBLE,%ecx
jne sc_retlongdouble
# Load %ecx with the pointer to storage for the return value
movl 24(%ebp),%ecx
fstpl (%ecx)
jmp sc_epilogue
sc_retlongdouble:
cmpl $FFI_TYPE_LONGDOUBLE,%ecx
jne sc_retint64
# Load %ecx with the pointer to storage for the return value
movl 24(%ebp),%ecx
fstpt (%ecx)
jmp sc_epilogue
sc_retint64:
cmpl $FFI_TYPE_SINT64,%ecx
jne sc_retstruct
# Load %ecx with the pointer to storage for the return value
movl 24(%ebp),%ecx
movl %eax,0(%ecx)
movl %edx,4(%ecx)
sc_retstruct:
# Nothing to do!
sc_noretval:
sc_epilogue:
movl %esi,%eax # return the stack difference
popl %esi # restore previous %esi value
movl %ebp,%esp
popl %ebp
ret
.ffi_call_STDCALL_end:

149
Modules/_ctypes/libffi_msvc/win32.c
View File

@ -29,21 +29,21 @@
/* theller: almost verbatim translation from gas syntax to MSVC inline
assembler code. */
/* theller: ffi_call_SYSV and ffi_call_STDCALL now return an integer - the
difference of the stack pointer before and after the function call. If
everything is ok, zero is returned. If stdcall functions are passed the
wrong number of arguments, the difference will be nonzero. */
/* theller: ffi_call_x86 now returns an integer - the difference of the stack
pointer before and after the function call. If everything is ok, zero is
returned. If stdcall functions are passed the wrong number of arguments,
the difference will be nonzero. */
#include <ffi.h>
#include <ffi_common.h>
__declspec(naked) int
ffi_call_SYSV(void (* prepfunc)(char *, extended_cif *), /* 8 */
extended_cif *ecif, /* 12 */
unsigned bytes, /* 16 */
unsigned flags, /* 20 */
unsigned *rvalue, /* 24 */
void (*fn)()) /* 28 */
ffi_call_x86(void (* prepfunc)(char *, extended_cif *), /* 8 */
extended_cif *ecif, /* 12 */
unsigned bytes, /* 16 */
unsigned flags, /* 20 */
unsigned *rvalue, /* 24 */
void (*fn)()) /* 28 */
{
_asm {
push ebp
@ -69,125 +69,20 @@ ffi_call_SYSV(void (* prepfunc)(char *, extended_cif *), /* 8 */
// FIXME: Align the stack to a 128-bit boundary to avoid
// potential performance hits.
call [ebp + 28]
// Remove the space we pushed for the args
// Load ecif->cif->abi
mov ecx, [ebp + 12]
mov ecx, [ecx]ecif.cif
mov ecx, [ecx]ecif.cif.abi
cmp ecx, FFI_STDCALL
je noclean
// STDCALL: Remove the space we pushed for the args
mov ecx, [ebp + 16]
add esp, ecx
// XXX ASSERT THAT ESP IS THE SAME NOW THAN BEFORE!
sub esi, esp
// Load %ecx with the return type code
mov ecx, [ebp + 20]
// If the return value pointer is NULL, assume no return value.
/*
Intel asm is weird. We have to explicitely specify 'DWORD PTR' in the nexr instruction,
otherwise only one BYTE will be compared (instead of a DWORD)!
*/
cmp DWORD PTR [ebp + 24], 0
jne sc_retint
// Even if there is no space for the return value, we are
// obliged to handle floating-point values.
cmp ecx, FFI_TYPE_FLOAT
jne sc_noretval
// fstp %st(0)
fstp st(0)
jmp sc_epilogue
sc_retint:
cmp ecx, FFI_TYPE_INT
jne sc_retfloat
// # Load %ecx with the pointer to storage for the return value
mov ecx, [ebp + 24]
mov [ecx + 0], eax
jmp sc_epilogue
sc_retfloat:
cmp ecx, FFI_TYPE_FLOAT
jne sc_retdouble
// Load %ecx with the pointer to storage for the return value
mov ecx, [ebp+24]
// fstps (%ecx)
fstp DWORD PTR [ecx]
jmp sc_epilogue
sc_retdouble:
cmp ecx, FFI_TYPE_DOUBLE
jne sc_retlongdouble
// movl 24(%ebp),%ecx
mov ecx, [ebp+24]
fstp QWORD PTR [ecx]
jmp sc_epilogue
jmp sc_retlongdouble // avoid warning about unused label
sc_retlongdouble:
cmp ecx, FFI_TYPE_LONGDOUBLE
jne sc_retint64
// Load %ecx with the pointer to storage for the return value
mov ecx, [ebp+24]
// fstpt (%ecx)
fstp QWORD PTR [ecx] /* XXX ??? */
jmp sc_epilogue
sc_retint64:
cmp ecx, FFI_TYPE_SINT64
jne sc_retstruct
// Load %ecx with the pointer to storage for the return value
mov ecx, [ebp+24]
mov [ecx+0], eax
mov [ecx+4], edx
sc_retstruct:
// Nothing to do!
sc_noretval:
sc_epilogue:
mov eax, esi
pop esi // NEW restore: must be preserved across function calls
mov esp, ebp
pop ebp
ret
}
}
__declspec(naked) int
ffi_call_STDCALL(void (* prepfunc)(char *, extended_cif *), /* 8 */
extended_cif *ecif, /* 12 */
unsigned bytes, /* 16 */
unsigned flags, /* 20 */
unsigned *rvalue, /* 24 */
void (*fn)()) /* 28 */
{
_asm {
push ebp
mov ebp, esp
push esi // NEW: this register must be preserved across function calls
// XXX SAVE ESP NOW!
mov esi, esp
// Make room for all of the new args.
mov ecx, [ebp+16]
sub esp, ecx
mov eax, esp
// Place all of the ffi_prep_args in position
push [ebp + 12] // ecif
push eax
call [ebp + 8] // prepfunc
// Return stack to previous state and call the function
add esp, 8
// FIXME: Align the stack to a 128-bit boundary to avoid
// potential performance hits.
call [ebp + 28]
// stdcall functions pop arguments off the stack themselves
// XXX IS ESP NOW THE SAME AS BEFORE?
// CDECL: Caller has already cleaned the stack
noclean:
// Check that esp has the same value as before!
sub esi, esp
// Load %ecx with the return type code