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Unified Diff: Modules/_ctypes/libffi_ios/aarch64/ffi_arm64.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/aarch64/ffi_arm64.c Wed Mar 02 00:01:35 2016 +0000
@@ -0,0 +1,934 @@
+#ifdef __arm64__
+
+/* Copyright (c) 2009, 2010, 2011, 2012 ARM Ltd.
+
+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 <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <fficonfig.h>
+#include <ffi.h>
+#include <ffi_common.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 128-bit type. */
+#if FFI_TYPE_DOUBLE != FFI_TYPE_LONGDOUBLE
+# if FFI_TYPE_LONGDOUBLE != 4
+# error FFI_TYPE_LONGDOUBLE out of date
+# endif
+#else
+# undef FFI_TYPE_LONGDOUBLE
+# define FFI_TYPE_LONGDOUBLE 4
+#endif
+
+union _d
+{
+ UINT64 d;
+ UINT32 s[2];
+};
+
+struct _v
+{
+ union _d d[2] __attribute__((aligned(16)));
+};
+
+struct call_context
+{
+ struct _v v[N_V_ARG_REG];
+ UINT64 x[N_X_ARG_REG];
+};
+
+#if defined (__clang__) && defined (__APPLE__)
+extern void sys_icache_invalidate (void *start, size_t len);
+#endif
+
+static inline void
+ffi_clear_cache (void *start, void *end)
+{
+#if defined (__clang__) && defined (__APPLE__)
+ sys_icache_invalidate (start, (char *)end - (char *)start);
+#elif defined (__GNUC__)
+ __builtin___clear_cache (start, end);
+#else
+#error "Missing builtin to flush instruction cache"
+#endif
+}
+
+#if FFI_EXEC_TRAMPOLINE_TABLE
+
+#ifdef __MACH__
+#include <mach/vm_param.h>
+#endif
+
+#endif
+
+/* A subroutine of is_vfp_type. Given a structure type, return the type code
+ of the first non-structure element. Recurse for structure elements.
+ Return -1 if the structure is in fact empty, i.e. no nested elements. */
+
+static int
+is_hfa0 (const ffi_type *ty)
+{
+ ffi_type **elements = ty->elements;
+ int i, ret = -1;
+
+ if (elements != NULL)
+ for (i = 0; elements[i]; ++i)
+ {
+ ret = elements[i]->type;
+ if (ret == FFI_TYPE_STRUCT || ret == FFI_TYPE_COMPLEX)
+ {
+ ret = is_hfa0 (elements[i]);
+ if (ret < 0)
+ continue;
+ }
+ break;
+ }
+
+ return ret;
+}
+
+/* A subroutine of is_vfp_type. Given a structure type, return true if all
+ of the non-structure elements are the same as CANDIDATE. */
+
+static int
+is_hfa1 (const ffi_type *ty, int candidate)
+{
+ ffi_type **elements = ty->elements;
+ int i;
+
+ if (elements != NULL)
+ for (i = 0; elements[i]; ++i)
+ {
+ int t = elements[i]->type;
+ if (t == FFI_TYPE_STRUCT || t == FFI_TYPE_COMPLEX)
+ {
+ if (!is_hfa1 (elements[i], candidate))
+ return 0;
+ }
+ else if (t != candidate)
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Determine if TY may be allocated to the FP registers. This is both an
+ fp scalar type as well as an homogenous floating point aggregate (HFA).
+ That is, a structure consisting of 1 to 4 members of all the same type,
+ where that type is an fp scalar.
+
+ Returns non-zero iff TY is an HFA. The result is the AARCH64_RET_*
+ constant for the type. */
+
+static int
+is_vfp_type (const ffi_type *ty)
+{
+ ffi_type **elements;
+ int candidate, i;
+ size_t size, ele_count;
+
+ /* Quickest tests first. */
+ candidate = ty->type;
+ switch (candidate)
+ {
+ default:
+ return 0;
+ case FFI_TYPE_FLOAT:
+ case FFI_TYPE_DOUBLE:
+ case FFI_TYPE_LONGDOUBLE:
+ ele_count = 1;
+ goto done;
+ case FFI_TYPE_COMPLEX:
+ candidate = ty->elements[0]->type;
+ switch (candidate)
+ {
+ case FFI_TYPE_FLOAT:
+ case FFI_TYPE_DOUBLE:
+ case FFI_TYPE_LONGDOUBLE:
+ ele_count = 2;
+ goto done;
+ }
+ return 0;
+ case FFI_TYPE_STRUCT:
+ break;
+ }
+
+ /* No HFA types are smaller than 4 bytes, or larger than 64 bytes. */
+ size = ty->size;
+ if (size < 4 || size > 64)
+ return 0;
+
+ /* Find the type of the first non-structure member. */
+ elements = ty->elements;
+ candidate = elements[0]->type;
+ if (candidate == FFI_TYPE_STRUCT || candidate == FFI_TYPE_COMPLEX)
+ {
+ for (i = 0; ; ++i)
+ {
+ candidate = is_hfa0 (elements[i]);
+ if (candidate >= 0)
+ break;
+ }
+ }
+
+ /* If the first member is not a floating point type, it's not an HFA.
+ Also quickly re-check the size of the structure. */
+ switch (candidate)
+ {
+ case FFI_TYPE_FLOAT:
+ ele_count = size / sizeof(float);
+ if (size != ele_count * sizeof(float))
+ return 0;
+ break;
+ case FFI_TYPE_DOUBLE:
+ ele_count = size / sizeof(double);
+ if (size != ele_count * sizeof(double))
+ return 0;
+ break;
+ case FFI_TYPE_LONGDOUBLE:
+ ele_count = size / sizeof(long double);
+ if (size != ele_count * sizeof(long double))
+ return 0;
+ break;
+ default:
+ return 0;
+ }
+ if (ele_count > 4)
+ return 0;
+
+ /* Finally, make sure that all scalar elements are the same type. */
+ for (i = 0; elements[i]; ++i)
+ {
+ int t = elements[i]->type;
+ if (t == FFI_TYPE_STRUCT || t == FFI_TYPE_COMPLEX)
+ {
+ if (!is_hfa1 (elements[i], candidate))
+ return 0;
+ }
+ else if (t != candidate)
+ return 0;
+ }
+
+ /* All tests succeeded. Encode the result. */
+ done:
+ return candidate * 4 + (4 - ele_count);
+}
+
+/* Representation of the procedure call argument marshalling
+ state.
+
+ The terse state variable names match the names used in the AARCH64
+ PCS. */
+
+struct arg_state
+{
+ unsigned ngrn; /* Next general-purpose register number. */
+ unsigned nsrn; /* Next vector register number. */
+ size_t nsaa; /* Next stack offset. */
+
+#if defined (__APPLE__)
+ unsigned allocating_variadic;
+#endif
+};
+
+/* Initialize a procedure call argument marshalling state. */
+static void
+arg_init (struct arg_state *state)
+{
+ state->ngrn = 0;
+ state->nsrn = 0;
+ state->nsaa = 0;
+#if defined (__APPLE__)
+ state->allocating_variadic = 0;
+#endif
+}
+
+/* Allocate an aligned slot on the stack and return a pointer to it. */
+static void *
+allocate_to_stack (struct arg_state *state, void *stack,
+ size_t alignment, size_t size)
+{
+ size_t nsaa = state->nsaa;
+
+ /* Round up the NSAA to the larger of 8 or the natural
+ alignment of the argument's type. */
+#if defined (__APPLE__)
+ if (state->allocating_variadic && alignment < 8)
+ alignment = 8;
+#else
+ if (alignment < 8)
+ alignment = 8;
+#endif
+
+ nsaa = ALIGN (nsaa, alignment);
+ state->nsaa = nsaa + size;
+
+ return (char *)stack + nsaa;
+}
+
+static ffi_arg
+extend_integer_type (void *source, int type)
+{
+ switch (type)
+ {
+ case FFI_TYPE_UINT8:
+ return *(UINT8 *) source;
+ case FFI_TYPE_SINT8:
+ return *(SINT8 *) source;
+ case FFI_TYPE_UINT16:
+ return *(UINT16 *) source;
+ case FFI_TYPE_SINT16:
+ return *(SINT16 *) source;
+ case FFI_TYPE_UINT32:
+ return *(UINT32 *) source;
+ case FFI_TYPE_INT:
+ case FFI_TYPE_SINT32:
+ return *(SINT32 *) source;
+ case FFI_TYPE_UINT64:
+ case FFI_TYPE_SINT64:
+ return *(UINT64 *) source;
+ break;
+ case FFI_TYPE_POINTER:
+ return *(uintptr_t *) source;
+ default:
+ abort();
+ }
+}
+
+static void
+extend_hfa_type (void *dest, void *src, int h)
+{
+ int f = h - AARCH64_RET_S4;
+ void *x0;
+
+ asm volatile (
+ "adr %0, 0f\n"
+" add %0, %0, %1\n"
+" br %0\n"
+"0: ldp s16, s17, [%3]\n" /* S4 */
+" ldp s18, s19, [%3, #8]\n"
+" b 4f\n"
+" ldp s16, s17, [%3]\n" /* S3 */
+" ldr s18, [%3, #8]\n"
+" b 3f\n"
+" ldp s16, s17, [%3]\n" /* S2 */
+" b 2f\n"
+" nop\n"
+" ldr s16, [%3]\n" /* S1 */
+" b 1f\n"
+" nop\n"
+" ldp d16, d17, [%3]\n" /* D4 */
+" ldp d18, d19, [%3, #16]\n"
+" b 4f\n"
+" ldp d16, d17, [%3]\n" /* D3 */
+" ldr d18, [%3, #16]\n"
+" b 3f\n"
+" ldp d16, d17, [%3]\n" /* D2 */
+" b 2f\n"
+" nop\n"
+" ldr d16, [%3]\n" /* D1 */
+" b 1f\n"
+" nop\n"
+" ldp q16, q17, [%3]\n" /* Q4 */
+" ldp q18, q19, [%3, #16]\n"
+" b 4f\n"
+" ldp q16, q17, [%3]\n" /* Q3 */
+" ldr q18, [%3, #16]\n"
+" b 3f\n"
+" ldp q16, q17, [%3]\n" /* Q2 */
+" b 2f\n"
+" nop\n"
+" ldr q16, [%3]\n" /* Q1 */
+" b 1f\n"
+"4: str q19, [%2, #48]\n"
+"3: str q18, [%2, #32]\n"
+"2: str q17, [%2, #16]\n"
+"1: str q16, [%2]"
+ : "=&r"(x0)
+ : "r"(f * 12), "r"(dest), "r"(src)
+ : "memory", "v16", "v17", "v18", "v19");
+}
+
+static void *
+compress_hfa_type (void *dest, void *reg, int h)
+{
+ switch (h)
+ {
+ case AARCH64_RET_S1:
+ if (dest == reg)
+ {
+#ifdef __AARCH64EB__
+ dest += 12;
+#endif
+ }
+ else
+ *(float *)dest = *(float *)reg;
+ break;
+ case AARCH64_RET_S2:
+ asm ("ldp q16, q17, [%1]\n\t"
+ "st2 { v16.s, v17.s }[0], [%0]"
+ : : "r"(dest), "r"(reg) : "memory", "v16", "v17");
+ break;
+ case AARCH64_RET_S3:
+ asm ("ldp q16, q17, [%1]\n\t"
+ "ldr q18, [%1, #32]\n\t"
+ "st3 { v16.s, v17.s, v18.s }[0], [%0]"
+ : : "r"(dest), "r"(reg) : "memory", "v16", "v17", "v18");
+ break;
+ case AARCH64_RET_S4:
+ asm ("ldp q16, q17, [%1]\n\t"
+ "ldp q18, q19, [%1, #32]\n\t"
+ "st4 { v16.s, v17.s, v18.s, v19.s }[0], [%0]"
+ : : "r"(dest), "r"(reg) : "memory", "v16", "v17", "v18", "v19");
+ break;
+
+ case AARCH64_RET_D1:
+ if (dest == reg)
+ {
+#ifdef __AARCH64EB__
+ dest += 8;
+#endif
+ }
+ else
+ *(double *)dest = *(double *)reg;
+ break;
+ case AARCH64_RET_D2:
+ asm ("ldp q16, q17, [%1]\n\t"
+ "st2 { v16.d, v17.d }[0], [%0]"
+ : : "r"(dest), "r"(reg) : "memory", "v16", "v17");
+ break;
+ case AARCH64_RET_D3:
+ asm ("ldp q16, q17, [%1]\n\t"
+ "ldr q18, [%1, #32]\n\t"
+ "st3 { v16.d, v17.d, v18.d }[0], [%0]"
+ : : "r"(dest), "r"(reg) : "memory", "v16", "v17", "v18");
+ break;
+ case AARCH64_RET_D4:
+ asm ("ldp q16, q17, [%1]\n\t"
+ "ldp q18, q19, [%1, #32]\n\t"
+ "st4 { v16.d, v17.d, v18.d, v19.d }[0], [%0]"
+ : : "r"(dest), "r"(reg) : "memory", "v16", "v17", "v18", "v19");
+ break;
+
+ default:
+ if (dest != reg)
+ return memcpy (dest, reg, 16 * (4 - (h & 3)));
+ break;
+ }
+ return dest;
+}
+
+/* Either allocate an appropriate register for the argument type, or if
+ none are available, allocate a stack slot and return a pointer
+ to the allocated space. */
+
+static void *
+allocate_int_to_reg_or_stack (struct call_context *context,
+ struct arg_state *state,
+ void *stack, size_t size)
+{
+ if (state->ngrn < N_X_ARG_REG)
+ return &context->x[state->ngrn++];
+
+ state->ngrn = N_X_ARG_REG;
+ return allocate_to_stack (state, stack, size, size);
+}
+
+ffi_status
+ffi_prep_cif_machdep (ffi_cif *cif)
+{
+ ffi_type *rtype = cif->rtype;
+ size_t bytes = cif->bytes;
+ int flags, i, n;
+
+ switch (rtype->type)
+ {
+ case FFI_TYPE_VOID:
+ flags = AARCH64_RET_VOID;
+ break;
+ case FFI_TYPE_UINT8:
+ flags = AARCH64_RET_UINT8;
+ break;
+ case FFI_TYPE_UINT16:
+ flags = AARCH64_RET_UINT16;
+ break;
+ case FFI_TYPE_UINT32:
+ flags = AARCH64_RET_UINT32;
+ break;
+ case FFI_TYPE_SINT8:
+ flags = AARCH64_RET_SINT8;
+ break;
+ case FFI_TYPE_SINT16:
+ flags = AARCH64_RET_SINT16;
+ break;
+ case FFI_TYPE_INT:
+ case FFI_TYPE_SINT32:
+ flags = AARCH64_RET_SINT32;
+ break;
+ case FFI_TYPE_SINT64:
+ case FFI_TYPE_UINT64:
+ flags = AARCH64_RET_INT64;
+ break;
+ case FFI_TYPE_POINTER:
+ flags = (sizeof(void *) == 4 ? AARCH64_RET_UINT32 : AARCH64_RET_INT64);
+ break;
+
+ case FFI_TYPE_FLOAT:
+ case FFI_TYPE_DOUBLE:
+ case FFI_TYPE_LONGDOUBLE:
+ case FFI_TYPE_STRUCT:
+ case FFI_TYPE_COMPLEX:
+ flags = is_vfp_type (rtype);
+ if (flags == 0)
+ {
+ size_t s = rtype->size;
+ if (s > 16)
+ {
+ flags = AARCH64_RET_VOID | AARCH64_RET_IN_MEM;
+ bytes += 8;
+ }
+ else if (s == 16)
+ flags = AARCH64_RET_INT128;
+ else if (s == 8)
+ flags = AARCH64_RET_INT64;
+ else
+ flags = AARCH64_RET_INT128 | AARCH64_RET_NEED_COPY;
+ }
+ break;
+
+ default:
+ abort();
+ }
+
+ for (i = 0, n = cif->nargs; i < n; i++)
+ if (is_vfp_type (cif->arg_types[i]))
+ {
+ flags |= AARCH64_FLAG_ARG_V;
+ break;
+ }
+
+ /* Round the stack up to a multiple of the stack alignment requirement. */
+ cif->bytes = ALIGN(bytes, 16);
+ cif->flags = flags;
+#if defined (__APPLE__)
+ cif->aarch64_nfixedargs = 0;
+#endif
+
+ return FFI_OK;
+}
+
+#if defined (__APPLE__)
+/* Perform Apple-specific cif processing for variadic calls */
+ffi_status ffi_prep_cif_machdep_var(ffi_cif *cif,
+ unsigned int nfixedargs,
+ unsigned int ntotalargs)
+{
+ ffi_status status = ffi_prep_cif_machdep (cif);
+ cif->aarch64_nfixedargs = nfixedargs;
+ return status;
+}
+#endif /* __APPLE__ */
+
+extern void ffi_call_SYSV (struct call_context *context, void *frame,
+ void (*fn)(void), void *rvalue, int flags,
+ void *closure) FFI_HIDDEN;
+
+/* Call a function with the provided arguments and capture the return
+ value. */
+static void
+ffi_call_int (ffi_cif *cif, void (*fn)(void), void *orig_rvalue,
+ void **avalue, void *closure)
+{
+ struct call_context *context;
+ void *stack, *frame, *rvalue;
+ struct arg_state state;
+ size_t stack_bytes, rtype_size, rsize;
+ int i, nargs, flags;
+ ffi_type *rtype;
+
+ flags = cif->flags;
+ rtype = cif->rtype;
+ rtype_size = rtype->size;
+ stack_bytes = cif->bytes;
+
+ /* If the target function returns a structure via hidden pointer,
+ then we cannot allow a null rvalue. Otherwise, mash a null
+ rvalue to void return type. */
+ rsize = 0;
+ if (flags & AARCH64_RET_IN_MEM)
+ {
+ if (orig_rvalue == NULL)
+ rsize = rtype_size;
+ }
+ else if (orig_rvalue == NULL)
+ flags &= AARCH64_FLAG_ARG_V;
+ else if (flags & AARCH64_RET_NEED_COPY)
+ rsize = 16;
+
+ /* Allocate consectutive stack for everything we'll need. */
+ context = alloca (sizeof(struct call_context) + stack_bytes + 32 + rsize);
+ stack = context + 1;
+ frame = stack + stack_bytes;
+ rvalue = (rsize ? frame + 32 : orig_rvalue);
+
+ arg_init (&state);
+ for (i = 0, nargs = cif->nargs; i < nargs; i++)
+ {
+ ffi_type *ty = cif->arg_types[i];
+ size_t s = ty->size;
+ void *a = avalue[i];
+ int h, t;
+
+ t = ty->type;
+ switch (t)
+ {
+ case FFI_TYPE_VOID:
+ FFI_ASSERT (0);
+ break;
+
+ /* If the argument is a basic type the argument is allocated to an
+ appropriate register, or if none are available, to the stack. */
+ case FFI_TYPE_INT:
+ case FFI_TYPE_UINT8:
+ case FFI_TYPE_SINT8:
+ case FFI_TYPE_UINT16:
+ case FFI_TYPE_SINT16:
+ case FFI_TYPE_UINT32:
+ case FFI_TYPE_SINT32:
+ case FFI_TYPE_UINT64:
+ case FFI_TYPE_SINT64:
+ case FFI_TYPE_POINTER:
+ do_pointer:
+ {
+ ffi_arg ext = extend_integer_type (a, t);
+ if (state.ngrn < N_X_ARG_REG)
+ context->x[state.ngrn++] = ext;
+ else
+ {
+ void *d = allocate_to_stack (&state, stack, ty->alignment, s);
+ state.ngrn = N_X_ARG_REG;
+ /* Note that the default abi extends each argument
+ to a full 64-bit slot, while the iOS abi allocates
+ only enough space. */
+#ifdef __APPLE__
+ memcpy(d, a, s);
+#else
+ *(ffi_arg *)d = ext;
+#endif
+ }
+ }
+ break;
+
+ case FFI_TYPE_FLOAT:
+ case FFI_TYPE_DOUBLE:
+ case FFI_TYPE_LONGDOUBLE:
+ case FFI_TYPE_STRUCT:
+ case FFI_TYPE_COMPLEX:
+ {
+ void *dest;
+
+ h = is_vfp_type (ty);
+ if (h)
+ {
+ int elems = 4 - (h & 3);
+ if (state.nsrn + elems <= N_V_ARG_REG)
+ {
+ dest = &context->v[state.nsrn];
+ state.nsrn += elems;
+ extend_hfa_type (dest, a, h);
+ break;
+ }
+ state.nsrn = N_V_ARG_REG;
+ dest = allocate_to_stack (&state, stack, ty->alignment, s);
+ }
+ else if (s > 16)
+ {
+ /* If the argument is a composite type that is larger than 16
+ bytes, then the argument has been copied to memory, and
+ the argument is replaced by a pointer to the copy. */
+ a = &avalue[i];
+ t = FFI_TYPE_POINTER;
+ goto do_pointer;
+ }
+ else
+ {
+ size_t n = (s + 7) / 8;
+ if (state.ngrn + n <= N_X_ARG_REG)
+ {
+ /* If the argument is a composite type and the size in
+ double-words is not more than the number of available
+ X registers, then the argument is copied into
+ consecutive X registers. */
+ dest = &context->x[state.ngrn];
+ state.ngrn += n;
+ }
+ else
+ {
+ /* Otherwise, there are insufficient X registers. Further
+ X register allocations are prevented, the NSAA is
+ adjusted and the argument is copied to memory at the
+ adjusted NSAA. */
+ state.ngrn = N_X_ARG_REG;
+ dest = allocate_to_stack (&state, stack, ty->alignment, s);
+ }
+ }
+ memcpy (dest, a, s);
+ }
+ break;
+
+ default:
+ abort();
+ }
+
+#if defined (__APPLE__)
+ if (i + 1 == cif->aarch64_nfixedargs)
+ {
+ state.ngrn = N_X_ARG_REG;
+ state.nsrn = N_V_ARG_REG;
+ state.allocating_variadic = 1;
+ }
+#endif
+ }
+
+ ffi_call_SYSV (context, frame, fn, rvalue, flags, closure);
+
+ if (flags & AARCH64_RET_NEED_COPY)
+ memcpy (orig_rvalue, rvalue, rtype_size);
+}
+
+void
+ffi_call (ffi_cif *cif, void (*fn) (void), void *rvalue, void **avalue)
+{
+ ffi_call_int (cif, fn, rvalue, avalue, NULL);
+}
+
+#ifdef FFI_GO_CLOSURES
+void
+ffi_call_go (ffi_cif *cif, void (*fn) (void), void *rvalue,
+ void **avalue, void *closure)
+{
+ ffi_call_int (cif, fn, rvalue, avalue, closure);
+}
+#endif /* FFI_GO_CLOSURES */
+
+/* Build a trampoline. */
+
+extern void ffi_closure_SYSV (void) FFI_HIDDEN;
+extern void ffi_closure_SYSV_V (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)
+{
+ if (cif->abi != FFI_SYSV)
+ return FFI_BAD_ABI;
+
+ void (*start)(void);
+
+ if (cif->flags & AARCH64_FLAG_ARG_V)
+ start = ffi_closure_SYSV_V;
+ else
+ start = ffi_closure_SYSV;
+
+#if FFI_EXEC_TRAMPOLINE_TABLE
+#ifdef __MACH__
+ void **config = (void **)((uint8_t *)codeloc - PAGE_MAX_SIZE);
+ config[0] = closure;
+ config[1] = start;
+#endif
+#else
+ static const unsigned char trampoline[16] = {
+ 0x90, 0x00, 0x00, 0x58, /* ldr x16, tramp+16 */
+ 0xf1, 0xff, 0xff, 0x10, /* adr x17, tramp+0 */
+ 0x00, 0x02, 0x1f, 0xd6 /* br x16 */
+ };
+ char *tramp = closure->tramp;
+
+ memcpy (tramp, trampoline, sizeof(trampoline));
+
+ *(UINT64 *)(tramp + 16) = (uintptr_t)start;
+
+ ffi_clear_cache(tramp, tramp + FFI_TRAMPOLINE_SIZE);
+#endif
+
+ closure->cif = cif;
+ closure->fun = fun;
+ closure->user_data = user_data;
+
+ return FFI_OK;
+}
+
+#ifdef FFI_GO_CLOSURES
+extern void ffi_go_closure_SYSV (void) FFI_HIDDEN;
+extern void ffi_go_closure_SYSV_V (void) FFI_HIDDEN;
+
+ffi_status
+ffi_prep_go_closure (ffi_go_closure *closure, ffi_cif* cif,
+ void (*fun)(ffi_cif*,void*,void**,void*))
+{
+ void (*start)(void);
+
+ if (cif->abi != FFI_SYSV)
+ return FFI_BAD_ABI;
+
+ if (cif->flags & AARCH64_FLAG_ARG_V)
+ start = ffi_go_closure_SYSV_V;
+ else
+ start = ffi_go_closure_SYSV;
+
+ closure->tramp = start;
+ closure->cif = cif;
+ closure->fun = fun;
+
+ return FFI_OK;
+}
+#endif /* FFI_GO_CLOSURES */
+
+/* Primary handler to setup and invoke a function within a closure.
+
+ A closure when invoked enters via the assembler wrapper
+ ffi_closure_SYSV(). The wrapper allocates a call context on the
+ stack, saves the interesting registers (from the perspective of
+ the calling convention) into the context then passes control to
+ ffi_closure_SYSV_inner() passing the saved context and a pointer to
+ the stack at the point ffi_closure_SYSV() was invoked.
+
+ On the return path the assembler wrapper will reload call context
+ registers.
+
+ ffi_closure_SYSV_inner() marshalls the call context into ffi value
+ descriptors, invokes the wrapped function, then marshalls the return
+ value back into the call context. */
+
+int FFI_HIDDEN
+ffi_closure_SYSV_inner (ffi_cif *cif,
+ void (*fun)(ffi_cif*,void*,void**,void*),
+ void *user_data,
+ struct call_context *context,
+ void *stack, void *rvalue, void *struct_rvalue)
+{
+ void **avalue = (void**) alloca (cif->nargs * sizeof (void*));
+ int i, h, nargs, flags;
+ struct arg_state state;
+
+ arg_init (&state);
+
+ for (i = 0, nargs = cif->nargs; i < nargs; i++)
+ {
+ ffi_type *ty = cif->arg_types[i];
+ int t = ty->type;
+ size_t n, s = ty->size;
+
+ switch (t)
+ {
+ case FFI_TYPE_VOID:
+ FFI_ASSERT (0);
+ break;
+
+ case FFI_TYPE_INT:
+ case FFI_TYPE_UINT8:
+ case FFI_TYPE_SINT8:
+ case FFI_TYPE_UINT16:
+ case FFI_TYPE_SINT16:
+ case FFI_TYPE_UINT32:
+ case FFI_TYPE_SINT32:
+ case FFI_TYPE_UINT64:
+ case FFI_TYPE_SINT64:
+ case FFI_TYPE_POINTER:
+ avalue[i] = allocate_int_to_reg_or_stack (context, &state, stack, s);
+ break;
+
+ case FFI_TYPE_FLOAT:
+ case FFI_TYPE_DOUBLE:
+ case FFI_TYPE_LONGDOUBLE:
+ case FFI_TYPE_STRUCT:
+ case FFI_TYPE_COMPLEX:
+ h = is_vfp_type (ty);
+ if (h)
+ {
+ n = 4 - (h & 3);
+ if (state.nsrn + n <= N_V_ARG_REG)
+ {
+ void *reg = &context->v[state.nsrn];
+ state.nsrn += n;
+
+ /* Eeek! We need a pointer to the structure, however the
+ homogeneous float elements are being passed in individual
+ registers, therefore for float and double the structure
+ is not represented as a contiguous sequence of bytes in
+ our saved register context. We don't need the original
+ contents of the register storage, so we reformat the
+ structure into the same memory. */
+ avalue[i] = compress_hfa_type (reg, reg, h);
+ }
+ else
+ {
+ state.nsrn = N_V_ARG_REG;
+ avalue[i] = allocate_to_stack (&state, stack,
+ ty->alignment, s);
+ }
+ }
+ else if (s > 16)
+ {
+ /* Replace Composite type of size greater than 16 with a
+ pointer. */
+ avalue[i] = *(void **)
+ allocate_int_to_reg_or_stack (context, &state, stack,
+ sizeof (void *));
+ }
+ else
+ {
+ n = (s + 7) / 8;
+ if (state.ngrn + n <= N_X_ARG_REG)
+ {
+ avalue[i] = &context->x[state.ngrn];
+ state.ngrn += n;
+ }
+ else
+ {
+ state.ngrn = N_X_ARG_REG;
+ avalue[i] = allocate_to_stack (&state, stack,
+ ty->alignment, s);
+ }
+ }
+ break;
+
+ default:
+ abort();
+ }
+ }
+
+ flags = cif->flags;
+ if (flags & AARCH64_RET_IN_MEM)
+ rvalue = struct_rvalue;
+
+ fun (cif, rvalue, avalue, user_data);
+
+ return flags;
+}
+
+
+#endif
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