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Diffstat (limited to 'libffi/src/x86/ffiw64.c')
-rw-r--r--libffi/src/x86/ffiw64.c281
1 files changed, 281 insertions, 0 deletions
diff --git a/libffi/src/x86/ffiw64.c b/libffi/src/x86/ffiw64.c
new file mode 100644
index 00000000000..8a33a6c4785
--- /dev/null
+++ b/libffi/src/x86/ffiw64.c
@@ -0,0 +1,281 @@
+/* -----------------------------------------------------------------------
+ ffiw64.c - Copyright (c) 2014 Red Hat, Inc.
+
+ x86 win64 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 THE AUTHORS OR COPYRIGHT
+ HOLDERS 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.
+ ----------------------------------------------------------------------- */
+
+#include <ffi.h>
+#include <ffi_common.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#ifdef X86_WIN64
+
+struct win64_call_frame
+{
+ UINT64 rbp; /* 0 */
+ UINT64 retaddr; /* 8 */
+ UINT64 fn; /* 16 */
+ UINT64 flags; /* 24 */
+ UINT64 rvalue; /* 32 */
+};
+
+extern void ffi_call_win64 (void *stack, struct win64_call_frame *,
+ void *closure) FFI_HIDDEN;
+
+ffi_status
+ffi_prep_cif_machdep (ffi_cif *cif)
+{
+ int flags, n;
+
+ if (cif->abi != FFI_WIN64)
+ return FFI_BAD_ABI;
+
+ flags = cif->rtype->type;
+ switch (flags)
+ {
+ default:
+ break;
+ case FFI_TYPE_LONGDOUBLE:
+ flags = FFI_TYPE_STRUCT;
+ break;
+ case FFI_TYPE_COMPLEX:
+ flags = FFI_TYPE_STRUCT;
+ /* FALLTHRU */
+ case FFI_TYPE_STRUCT:
+ switch (cif->rtype->size)
+ {
+ case 8:
+ flags = FFI_TYPE_UINT64;
+ break;
+ case 4:
+ flags = FFI_TYPE_SMALL_STRUCT_4B;
+ break;
+ case 2:
+ flags = FFI_TYPE_SMALL_STRUCT_2B;
+ break;
+ case 1:
+ flags = FFI_TYPE_SMALL_STRUCT_1B;
+ break;
+ }
+ break;
+ }
+ cif->flags = flags;
+
+ /* Each argument either fits in a register, an 8 byte slot, or is
+ passed by reference with the pointer in the 8 byte slot. */
+ n = cif->nargs;
+ n += (flags == FFI_TYPE_STRUCT);
+ if (n < 4)
+ n = 4;
+ cif->bytes = n * 8;
+
+ return FFI_OK;
+}
+
+static void
+ffi_call_int (ffi_cif *cif, void (*fn)(void), void *rvalue,
+ void **avalue, void *closure)
+{
+ int i, j, n, flags;
+ UINT64 *stack;
+ size_t rsize;
+ struct win64_call_frame *frame;
+
+ FFI_ASSERT(cif->abi == FFI_WIN64);
+
+ flags = cif->flags;
+ rsize = 0;
+
+ /* If we have no return value for a structure, we need to create one.
+ Otherwise we can ignore the return type entirely. */
+ if (rvalue == NULL)
+ {
+ if (flags == FFI_TYPE_STRUCT)
+ rsize = cif->rtype->size;
+ else
+ flags = FFI_TYPE_VOID;
+ }
+
+ stack = alloca(cif->bytes + sizeof(struct win64_call_frame) + rsize);
+ frame = (struct win64_call_frame *)((char *)stack + cif->bytes);
+ if (rsize)
+ rvalue = frame + 1;
+
+ frame->fn = (uintptr_t)fn;
+ frame->flags = flags;
+ frame->rvalue = (uintptr_t)rvalue;
+
+ j = 0;
+ if (flags == FFI_TYPE_STRUCT)
+ {
+ stack[0] = (uintptr_t)rvalue;
+ j = 1;
+ }
+
+ for (i = 0, n = cif->nargs; i < n; ++i, ++j)
+ {
+ switch (cif->arg_types[i]->size)
+ {
+ case 8:
+ stack[j] = *(UINT64 *)avalue[i];
+ break;
+ case 4:
+ stack[j] = *(UINT32 *)avalue[i];
+ break;
+ case 2:
+ stack[j] = *(UINT16 *)avalue[i];
+ break;
+ case 1:
+ stack[j] = *(UINT8 *)avalue[i];
+ break;
+ default:
+ stack[j] = (uintptr_t)avalue[i];
+ break;
+ }
+ }
+
+ ffi_call_win64 (stack, frame, closure);
+}
+
+void
+ffi_call (ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue)
+{
+ ffi_call_int (cif, fn, rvalue, avalue, NULL);
+}
+
+void
+ffi_call_go (ffi_cif *cif, void (*fn)(void), void *rvalue,
+ void **avalue, void *closure)
+{
+ ffi_call_int (cif, fn, rvalue, avalue, closure);
+}
+
+
+extern void ffi_closure_win64(void) FFI_HIDDEN;
+extern void ffi_go_closure_win64(void) FFI_HIDDEN;
+
+ffi_status
+ffi_prep_closure_loc (ffi_closure* closure,
+ ffi_cif* cif,
+ void (*fun)(ffi_cif*, void*, void**, void*),
+ void *user_data,
+ void *codeloc)
+{
+ static const unsigned char trampoline[16] = {
+ /* leaq -0x7(%rip),%r10 # 0x0 */
+ 0x4c, 0x8d, 0x15, 0xf9, 0xff, 0xff, 0xff,
+ /* jmpq *0x3(%rip) # 0x10 */
+ 0xff, 0x25, 0x03, 0x00, 0x00, 0x00,
+ /* nopl (%rax) */
+ 0x0f, 0x1f, 0x00
+ };
+ unsigned char *tramp = closure->tramp;
+
+ if (cif->abi != FFI_WIN64)
+ return FFI_BAD_ABI;
+
+ memcpy (tramp, trampoline, sizeof(trampoline));
+ *(UINT64 *)(tramp + 16) = (uintptr_t)ffi_closure_win64;
+
+ closure->cif = cif;
+ closure->fun = fun;
+ closure->user_data = user_data;
+
+ return FFI_OK;
+}
+
+ffi_status
+ffi_prep_go_closure (ffi_go_closure* closure, ffi_cif* cif,
+ void (*fun)(ffi_cif*, void*, void**, void*))
+{
+ if (cif->abi != FFI_WIN64)
+ return FFI_BAD_ABI;
+
+ closure->tramp = ffi_go_closure_win64;
+ closure->cif = cif;
+ closure->fun = fun;
+
+ return FFI_OK;
+}
+
+struct win64_closure_frame
+{
+ UINT64 rvalue[2];
+ UINT64 fargs[4];
+ UINT64 retaddr;
+ UINT64 args[];
+};
+
+int FFI_HIDDEN
+ffi_closure_win64_inner(ffi_cif *cif,
+ void (*fun)(ffi_cif*, void*, void**, void*),
+ void *user_data,
+ struct win64_closure_frame *frame)
+{
+ void **avalue;
+ void *rvalue;
+ int i, n, nreg, flags;
+
+ avalue = alloca(cif->nargs * sizeof(void *));
+ rvalue = frame->rvalue;
+ nreg = 0;
+
+ /* When returning a structure, the address is in the first argument.
+ We must also be prepared to return the same address in eax, so
+ install that address in the frame and pretend we return a pointer. */
+ flags = cif->flags;
+ if (flags == FFI_TYPE_STRUCT)
+ {
+ rvalue = (void *)(uintptr_t)frame->args[0];
+ frame->rvalue[0] = frame->args[0];
+ nreg = 1;
+ }
+
+ for (i = 0, n = cif->nargs; i < n; ++i, ++nreg)
+ {
+ size_t size = cif->arg_types[i]->size;
+ size_t type = cif->arg_types[i]->type;
+ void *a;
+
+ if (type == FFI_TYPE_DOUBLE || type == FFI_TYPE_FLOAT)
+ {
+ if (nreg < 4)
+ a = &frame->fargs[nreg];
+ else
+ a = &frame->args[nreg];
+ }
+ else if (size == 1 || size == 2 || size == 4 || size == 8)
+ a = &frame->args[nreg];
+ else
+ a = (void *)(uintptr_t)frame->args[nreg];
+
+ avalue[i] = a;
+ }
+
+ /* Invoke the closure. */
+ fun (cif, rvalue, avalue, user_data);
+ return flags;
+}
+
+#endif /* X86_WIN64 */
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