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Unified Diff: Modules/_ctypes/libffi_ios/x86/ffi_i386.c

Issue 23670: Modifications to support iOS as a development platform
Patch Set: Created 3 years, 8 months ago
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Modules/_ctypes/libffi_ios/x86/ffi_i386.c Wed Mar 02 00:01:35 2016 +0000
@@ -0,0 +1,734 @@
+#ifdef __i386__
+
+/* -----------------------------------------------------------------------
+ ffi.c - Copyright (c) 1996, 1998, 1999, 2001, 2007, 2008 Red Hat, Inc.
+ Copyright (c) 2002 Ranjit Mathew
+ Copyright (c) 2002 Bo Thorsen
+ Copyright (c) 2002 Roger Sayle
+ Copyright (C) 2008, 2010 Free Software Foundation, Inc.
+
+ 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 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.
+ ----------------------------------------------------------------------- */
+
+#ifndef __x86_64__
+#include <ffi.h>
+#include <ffi_common.h>
+#include <stdlib.h>
+#include "internal.h"
+
+/* Force FFI_TYPE_LONGDOUBLE to be different than FFI_TYPE_DOUBLE;
+ all further uses in this file will refer to the 80-bit type. */
+#if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE
+# if FFI_TYPE_LONGDOUBLE != 4
+# error FFI_TYPE_LONGDOUBLE out of date
+# endif
+#else
+# undef FFI_TYPE_LONGDOUBLE
+# define FFI_TYPE_LONGDOUBLE 4
+#endif
+
+#if defined(__GNUC__) && !defined(__declspec)
+# define __declspec(x) __attribute__((x))
+#endif
+
+/* Perform machine dependent cif processing. */
+ffi_status FFI_HIDDEN
+ffi_prep_cif_machdep(ffi_cif *cif)
+{
+ size_t bytes = 0;
+ int i, n, flags, cabi = cif->abi;
+
+ switch (cabi)
+ {
+ case FFI_SYSV:
+ case FFI_STDCALL:
+ case FFI_THISCALL:
+ case FFI_FASTCALL:
+ case FFI_MS_CDECL:
+ case FFI_PASCAL:
+ case FFI_REGISTER:
+ break;
+ default:
+ return FFI_BAD_ABI;
+ }
+
+ switch (cif->rtype->type)
+ {
+ case FFI_TYPE_VOID:
+ flags = X86_RET_VOID;
+ break;
+ case FFI_TYPE_FLOAT:
+ flags = X86_RET_FLOAT;
+ break;
+ case FFI_TYPE_DOUBLE:
+ flags = X86_RET_DOUBLE;
+ break;
+ case FFI_TYPE_LONGDOUBLE:
+ flags = X86_RET_LDOUBLE;
+ break;
+ case FFI_TYPE_UINT8:
+ flags = X86_RET_UINT8;
+ break;
+ case FFI_TYPE_UINT16:
+ flags = X86_RET_UINT16;
+ break;
+ case FFI_TYPE_SINT8:
+ flags = X86_RET_SINT8;
+ break;
+ case FFI_TYPE_SINT16:
+ flags = X86_RET_SINT16;
+ break;
+ case FFI_TYPE_INT:
+ case FFI_TYPE_SINT32:
+ case FFI_TYPE_UINT32:
+ case FFI_TYPE_POINTER:
+ flags = X86_RET_INT32;
+ break;
+ case FFI_TYPE_SINT64:
+ case FFI_TYPE_UINT64:
+ flags = X86_RET_INT64;
+ break;
+ case FFI_TYPE_STRUCT:
+#ifndef X86
+ /* ??? This should be a different ABI rather than an ifdef. */
+ if (cif->rtype->size == 1)
+ flags = X86_RET_STRUCT_1B;
+ else if (cif->rtype->size == 2)
+ flags = X86_RET_STRUCT_2B;
+ else if (cif->rtype->size == 4)
+ flags = X86_RET_INT32;
+ else if (cif->rtype->size == 8)
+ flags = X86_RET_INT64;
+ else
+#endif
+ {
+ do_struct:
+ switch (cabi)
+ {
+ case FFI_THISCALL:
+ case FFI_FASTCALL:
+ case FFI_STDCALL:
+ case FFI_MS_CDECL:
+ flags = X86_RET_STRUCTARG;
+ break;
+ default:
+ flags = X86_RET_STRUCTPOP;
+ break;
+ }
+ /* Allocate space for return value pointer. */
+ bytes += ALIGN (sizeof(void*), FFI_SIZEOF_ARG);
+ }
+ break;
+ case FFI_TYPE_COMPLEX:
+ switch (cif->rtype->elements[0]->type)
+ {
+ case FFI_TYPE_DOUBLE:
+ case FFI_TYPE_LONGDOUBLE:
+ case FFI_TYPE_SINT64:
+ case FFI_TYPE_UINT64:
+ goto do_struct;
+ case FFI_TYPE_FLOAT:
+ case FFI_TYPE_INT:
+ case FFI_TYPE_SINT32:
+ case FFI_TYPE_UINT32:
+ flags = X86_RET_INT64;
+ break;
+ case FFI_TYPE_SINT16:
+ case FFI_TYPE_UINT16:
+ flags = X86_RET_INT32;
+ break;
+ case FFI_TYPE_SINT8:
+ case FFI_TYPE_UINT8:
+ flags = X86_RET_STRUCT_2B;
+ break;
+ default:
+ return FFI_BAD_TYPEDEF;
+ }
+ break;
+ default:
+ return FFI_BAD_TYPEDEF;
+ }
+ cif->flags = flags;
+
+ for (i = 0, n = cif->nargs; i < n; i++)
+ {
+ ffi_type *t = cif->arg_types[i];
+
+ bytes = ALIGN (bytes, t->alignment);
+ bytes += ALIGN (t->size, FFI_SIZEOF_ARG);
+ }
+ cif->bytes = ALIGN (bytes, 16);
+
+ return FFI_OK;
+}
+
+static ffi_arg
+extend_basic_type(void *arg, int type)
+{
+ switch (type)
+ {
+ case FFI_TYPE_SINT8:
+ return *(SINT8 *)arg;
+ case FFI_TYPE_UINT8:
+ return *(UINT8 *)arg;
+ case FFI_TYPE_SINT16:
+ return *(SINT16 *)arg;
+ case FFI_TYPE_UINT16:
+ return *(UINT16 *)arg;
+
+ case FFI_TYPE_SINT32:
+ case FFI_TYPE_UINT32:
+ case FFI_TYPE_POINTER:
+ case FFI_TYPE_FLOAT:
+ return *(UINT32 *)arg;
+
+ default:
+ abort();
+ }
+}
+
+struct call_frame
+{
+ void *ebp; /* 0 */
+ void *retaddr; /* 4 */
+ void (*fn)(void); /* 8 */
+ int flags; /* 12 */
+ void *rvalue; /* 16 */
+ unsigned regs[3]; /* 20-28 */
+};
+
+struct abi_params
+{
+ int dir; /* parameter growth direction */
+ int static_chain; /* the static chain register used by gcc */
+ int nregs; /* number of register parameters */
+ int regs[3];
+};
+
+static const struct abi_params abi_params[FFI_LAST_ABI] = {
+ [FFI_SYSV] = { 1, R_ECX, 0 },
+ [FFI_THISCALL] = { 1, R_EAX, 1, { R_ECX } },
+ [FFI_FASTCALL] = { 1, R_EAX, 2, { R_ECX, R_EDX } },
+ [FFI_STDCALL] = { 1, R_ECX, 0 },
+ [FFI_PASCAL] = { -1, R_ECX, 0 },
+ /* ??? No defined static chain; gcc does not support REGISTER. */
+ [FFI_REGISTER] = { -1, R_ECX, 3, { R_EAX, R_EDX, R_ECX } },
+ [FFI_MS_CDECL] = { 1, R_ECX, 0 }
+};
+
+extern void ffi_call_i386(struct call_frame *, char *)
+#if HAVE_FASTCALL
+ __declspec(fastcall)
+#endif
+ FFI_HIDDEN;
+
+static void
+ffi_call_int (ffi_cif *cif, void (*fn)(void), void *rvalue,
+ void **avalue, void *closure)
+{
+ size_t rsize, bytes;
+ struct call_frame *frame;
+ char *stack, *argp;
+ ffi_type **arg_types;
+ int flags, cabi, i, n, dir, narg_reg;
+ const struct abi_params *pabi;
+
+ flags = cif->flags;
+ cabi = cif->abi;
+ pabi = &abi_params[cabi];
+ dir = pabi->dir;
+
+ rsize = 0;
+ if (rvalue == NULL)
+ {
+ switch (flags)
+ {
+ case X86_RET_FLOAT:
+ case X86_RET_DOUBLE:
+ case X86_RET_LDOUBLE:
+ case X86_RET_STRUCTPOP:
+ case X86_RET_STRUCTARG:
+ /* The float cases need to pop the 387 stack.
+ The struct cases need to pass a valid pointer to the callee. */
+ rsize = cif->rtype->size;
+ break;
+ default:
+ /* We can pretend that the callee returns nothing. */
+ flags = X86_RET_VOID;
+ break;
+ }
+ }
+
+ bytes = cif->bytes;
+ stack = alloca(bytes + sizeof(*frame) + rsize);
+ argp = (dir < 0 ? stack + bytes : stack);
+ frame = (struct call_frame *)(stack + bytes);
+ if (rsize)
+ rvalue = frame + 1;
+
+ frame->fn = fn;
+ frame->flags = flags;
+ frame->rvalue = rvalue;
+ frame->regs[pabi->static_chain] = (unsigned)closure;
+
+ narg_reg = 0;
+ switch (flags)
+ {
+ case X86_RET_STRUCTARG:
+ /* The pointer is passed as the first argument. */
+ if (pabi->nregs > 0)
+ {
+ frame->regs[pabi->regs[0]] = (unsigned)rvalue;
+ narg_reg = 1;
+ break;
+ }
+ /* fallthru */
+ case X86_RET_STRUCTPOP:
+ *(void **)argp = rvalue;
+ argp += sizeof(void *);
+ break;
+ }
+
+ arg_types = cif->arg_types;
+ for (i = 0, n = cif->nargs; i < n; i++)
+ {
+ ffi_type *ty = arg_types[i];
+ void *valp = avalue[i];
+ size_t z = ty->size;
+ int t = ty->type;
+
+ if (z <= FFI_SIZEOF_ARG && t != FFI_TYPE_STRUCT)
+ {
+ ffi_arg val = extend_basic_type (valp, t);
+
+ if (t != FFI_TYPE_FLOAT && narg_reg < pabi->nregs)
+ frame->regs[pabi->regs[narg_reg++]] = val;
+ else if (dir < 0)
+ {
+ argp -= 4;
+ *(ffi_arg *)argp = val;
+ }
+ else
+ {
+ *(ffi_arg *)argp = val;
+ argp += 4;
+ }
+ }
+ else
+ {
+ size_t za = ALIGN (z, FFI_SIZEOF_ARG);
+ size_t align = FFI_SIZEOF_ARG;
+
+ /* Alignment rules for arguments are quite complex. Vectors and
+ structures with 16 byte alignment get it. Note that long double
+ on Darwin does have 16 byte alignment, and does not get this
+ alignment if passed directly; a structure with a long double
+ inside, however, would get 16 byte alignment. Since libffi does
+ not support vectors, we need non concern ourselves with other
+ cases. */
+ if (t == FFI_TYPE_STRUCT && ty->alignment >= 16)
+ align = 16;
+
+ if (dir < 0)
+ {
+ /* ??? These reverse argument ABIs are probably too old
+ to have cared about alignment. Someone should check. */
+ argp -= za;
+ memcpy (argp, valp, z);
+ }
+ else
+ {
+ argp = (char *)ALIGN (argp, align);
+ memcpy (argp, valp, z);
+ argp += za;
+ }
+ }
+ }
+ FFI_ASSERT (dir > 0 || argp == stack);
+
+ ffi_call_i386 (frame, stack);
+}
+
+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);
+}
+
+/** private members **/
+
+void FFI_HIDDEN ffi_closure_i386(void);
+void FFI_HIDDEN ffi_closure_STDCALL(void);
+void FFI_HIDDEN ffi_closure_REGISTER(void);
+
+struct closure_frame
+{
+ unsigned rettemp[4]; /* 0 */
+ unsigned regs[3]; /* 16-24 */
+ ffi_cif *cif; /* 28 */
+ void (*fun)(ffi_cif*,void*,void**,void*); /* 32 */
+ void *user_data; /* 36 */
+};
+
+int FFI_HIDDEN
+#if HAVE_FASTCALL
+__declspec(fastcall)
+#endif
+ffi_closure_inner (struct closure_frame *frame, char *stack)
+{
+ ffi_cif *cif = frame->cif;
+ int cabi, i, n, flags, dir, narg_reg;
+ const struct abi_params *pabi;
+ ffi_type **arg_types;
+ char *argp;
+ void *rvalue;
+ void **avalue;
+
+ cabi = cif->abi;
+ flags = cif->flags;
+ narg_reg = 0;
+ rvalue = frame->rettemp;
+ pabi = &abi_params[cabi];
+ dir = pabi->dir;
+ argp = (dir < 0 ? stack + cif->bytes : stack);
+
+ switch (flags)
+ {
+ case X86_RET_STRUCTARG:
+ if (pabi->nregs > 0)
+ {
+ rvalue = (void *)frame->regs[pabi->regs[0]];
+ narg_reg = 1;
+ frame->rettemp[0] = (unsigned)rvalue;
+ break;
+ }
+ /* fallthru */
+ case X86_RET_STRUCTPOP:
+ rvalue = *(void **)argp;
+ argp += sizeof(void *);
+ frame->rettemp[0] = (unsigned)rvalue;
+ break;
+ }
+
+ n = cif->nargs;
+ avalue = alloca(sizeof(void *) * n);
+
+ arg_types = cif->arg_types;
+ for (i = 0; i < n; ++i)
+ {
+ ffi_type *ty = arg_types[i];
+ size_t z = ty->size;
+ int t = ty->type;
+ void *valp;
+
+ if (z <= FFI_SIZEOF_ARG && t != FFI_TYPE_STRUCT)
+ {
+ if (t != FFI_TYPE_FLOAT && narg_reg < pabi->nregs)
+ valp = &frame->regs[pabi->regs[narg_reg++]];
+ else if (dir < 0)
+ {
+ argp -= 4;
+ valp = argp;
+ }
+ else
+ {
+ valp = argp;
+ argp += 4;
+ }
+ }
+ else
+ {
+ size_t za = ALIGN (z, FFI_SIZEOF_ARG);
+ size_t align = FFI_SIZEOF_ARG;
+
+ /* See the comment in ffi_call_int. */
+ if (t == FFI_TYPE_STRUCT && ty->alignment >= 16)
+ align = 16;
+
+ if (dir < 0)
+ {
+ /* ??? These reverse argument ABIs are probably too old
+ to have cared about alignment. Someone should check. */
+ argp -= za;
+ valp = argp;
+ }
+ else
+ {
+ argp = (char *)ALIGN (argp, align);
+ valp = argp;
+ argp += za;
+ }
+ }
+
+ avalue[i] = valp;
+ }
+
+ frame->fun (cif, rvalue, avalue, frame->user_data);
+
+ if (cabi == FFI_STDCALL)
+ return flags + (cif->bytes << X86_RET_POP_SHIFT);
+ else
+ return flags;
+}
+
+ffi_status
+ffi_prep_closure_loc (ffi_closure* closure,
+ ffi_cif* cif,
+ void (*fun)(ffi_cif*,void*,void**,void*),
+ void *user_data,
+ void *codeloc)
+{
+ char *tramp = closure->tramp;
+ void (*dest)(void);
+ int op = 0xb8; /* movl imm, %eax */
+
+ switch (cif->abi)
+ {
+ case FFI_SYSV:
+ case FFI_THISCALL:
+ case FFI_FASTCALL:
+ case FFI_MS_CDECL:
+ dest = ffi_closure_i386;
+ break;
+ case FFI_STDCALL:
+ case FFI_PASCAL:
+ dest = ffi_closure_STDCALL;
+ break;
+ case FFI_REGISTER:
+ dest = ffi_closure_REGISTER;
+ op = 0x68; /* pushl imm */
+ default:
+ return FFI_BAD_ABI;
+ }
+
+ /* movl or pushl immediate. */
+ tramp[0] = op;
+ *(void **)(tramp + 1) = codeloc;
+
+ /* jmp dest */
+ tramp[5] = 0xe9;
+ *(unsigned *)(tramp + 6) = (unsigned)dest - ((unsigned)codeloc + 10);
+
+ closure->cif = cif;
+ closure->fun = fun;
+ closure->user_data = user_data;
+
+ return FFI_OK;
+}
+
+void FFI_HIDDEN ffi_go_closure_EAX(void);
+void FFI_HIDDEN ffi_go_closure_ECX(void);
+void FFI_HIDDEN ffi_go_closure_STDCALL(void);
+
+ffi_status
+ffi_prep_go_closure (ffi_go_closure* closure, ffi_cif* cif,
+ void (*fun)(ffi_cif*,void*,void**,void*))
+{
+ void (*dest)(void);
+
+ switch (cif->abi)
+ {
+ case FFI_SYSV:
+ case FFI_MS_CDECL:
+ dest = ffi_go_closure_ECX;
+ break;
+ case FFI_THISCALL:
+ case FFI_FASTCALL:
+ dest = ffi_go_closure_EAX;
+ break;
+ case FFI_STDCALL:
+ case FFI_PASCAL:
+ dest = ffi_go_closure_STDCALL;
+ break;
+ case FFI_REGISTER:
+ default:
+ return FFI_BAD_ABI;
+ }
+
+ closure->tramp = dest;
+ closure->cif = cif;
+ closure->fun = fun;
+
+ return FFI_OK;
+}
+
+/* ------- Native raw API support -------------------------------- */
+
+#if !FFI_NO_RAW_API
+
+void FFI_HIDDEN ffi_closure_raw_SYSV(void);
+void FFI_HIDDEN ffi_closure_raw_THISCALL(void);
+
+ffi_status
+ffi_prep_raw_closure_loc (ffi_raw_closure *closure,
+ ffi_cif *cif,
+ void (*fun)(ffi_cif*,void*,ffi_raw*,void*),
+ void *user_data,
+ void *codeloc)
+{
+ char *tramp = closure->tramp;
+ void (*dest)(void);
+ int i;
+
+ /* We currently don't support certain kinds of arguments for raw
+ closures. This should be implemented by a separate assembly
+ language routine, since it would require argument processing,
+ something we don't do now for performance. */
+ for (i = cif->nargs-1; i >= 0; i--)
+ switch (cif->arg_types[i]->type)
+ {
+ case FFI_TYPE_STRUCT:
+ case FFI_TYPE_LONGDOUBLE:
+ return FFI_BAD_TYPEDEF;
+ }
+
+ switch (cif->abi)
+ {
+ case FFI_THISCALL:
+ dest = ffi_closure_raw_THISCALL;
+ break;
+ case FFI_SYSV:
+ dest = ffi_closure_raw_SYSV;
+ break;
+ default:
+ return FFI_BAD_ABI;
+ }
+
+ /* movl imm, %eax. */
+ tramp[0] = 0xb8;
+ *(void **)(tramp + 1) = codeloc;
+
+ /* jmp dest */
+ tramp[5] = 0xe9;
+ *(unsigned *)(tramp + 6) = (unsigned)dest - ((unsigned)codeloc + 10);
+
+ closure->cif = cif;
+ closure->fun = fun;
+ closure->user_data = user_data;
+
+ return FFI_OK;
+}
+
+void
+ffi_raw_call(ffi_cif *cif, void (*fn)(void), void *rvalue, ffi_raw *avalue)
+{
+ size_t rsize, bytes;
+ struct call_frame *frame;
+ char *stack, *argp;
+ ffi_type **arg_types;
+ int flags, cabi, i, n, narg_reg;
+ const struct abi_params *pabi;
+
+ flags = cif->flags;
+ cabi = cif->abi;
+ pabi = &abi_params[cabi];
+
+ rsize = 0;
+ if (rvalue == NULL)
+ {
+ switch (flags)
+ {
+ case X86_RET_FLOAT:
+ case X86_RET_DOUBLE:
+ case X86_RET_LDOUBLE:
+ case X86_RET_STRUCTPOP:
+ case X86_RET_STRUCTARG:
+ /* The float cases need to pop the 387 stack.
+ The struct cases need to pass a valid pointer to the callee. */
+ rsize = cif->rtype->size;
+ break;
+ default:
+ /* We can pretend that the callee returns nothing. */
+ flags = X86_RET_VOID;
+ break;
+ }
+ }
+
+ bytes = cif->bytes;
+ argp = stack = alloca(bytes + sizeof(*frame) + rsize);
+ frame = (struct call_frame *)(stack + bytes);
+ if (rsize)
+ rvalue = frame + 1;
+
+ frame->fn = fn;
+ frame->flags = flags;
+ frame->rvalue = rvalue;
+
+ narg_reg = 0;
+ switch (flags)
+ {
+ case X86_RET_STRUCTARG:
+ /* The pointer is passed as the first argument. */
+ if (pabi->nregs > 0)
+ {
+ frame->regs[pabi->regs[0]] = (unsigned)rvalue;
+ narg_reg = 1;
+ break;
+ }
+ /* fallthru */
+ case X86_RET_STRUCTPOP:
+ *(void **)argp = rvalue;
+ argp += sizeof(void *);
+ bytes -= sizeof(void *);
+ break;
+ }
+
+ arg_types = cif->arg_types;
+ for (i = 0, n = cif->nargs; narg_reg < pabi->nregs && i < n; i++)
+ {
+ ffi_type *ty = arg_types[i];
+ size_t z = ty->size;
+ int t = ty->type;
+
+ if (z <= FFI_SIZEOF_ARG && t != FFI_TYPE_STRUCT && t != FFI_TYPE_FLOAT)
+ {
+ ffi_arg val = extend_basic_type (avalue, t);
+ frame->regs[pabi->regs[narg_reg++]] = val;
+ z = FFI_SIZEOF_ARG;
+ }
+ else
+ {
+ memcpy (argp, avalue, z);
+ z = ALIGN (z, FFI_SIZEOF_ARG);
+ argp += z;
+ }
+ avalue += z;
+ bytes -= z;
+ }
+ if (i < n)
+ memcpy (argp, avalue, bytes);
+
+ ffi_call_i386 (frame, stack);
+}
+#endif /* !FFI_NO_RAW_API */
+#endif /* !__x86_64__ */
+
+
+#endif
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