219 lines
5.8 KiB
C
219 lines
5.8 KiB
C
/*
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* Copyright (c) 2015, NVIDIA CORPORATION.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and/or associated documentation files (the
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* "Materials"), to deal in the Materials without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Materials, and to
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* permit persons to whom the Materials are furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* unaltered in all copies or substantial portions of the Materials.
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* Any additions, deletions, or changes to the original source files
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* must be clearly indicated in accompanying documentation.
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*
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* THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
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*/
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#include "glvnd_genentry.h"
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#include "utils_misc.h"
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#include "compiler.h"
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#include <string.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <assert.h>
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#if defined(USE_DISPATCH_ASM)
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#define _U_STRINGIFY(x) #x
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#define U_STRINGIFY(x) _U_STRINGIFY(x)
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#define GLX_STUBS_COUNT
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#include "g_glx_dispatch_stub_list.h"
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USED static GLVNDentrypointStub entrypointFunctions[GENERATED_ENTRYPOINT_MAX];
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static char *entrypointNames[GENERATED_ENTRYPOINT_MAX] = {};
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static int entrypointCount = 0;
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extern char glx_entrypoint_start[];
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extern char glx_entrypoint_end[];
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#if defined(USE_X86_ASM)
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#define STUB_SIZE 32
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#define STUB_ASM_ARCH(slot) \
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"push %ebx\n" \
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"call 1f\n" \
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"1:\n" \
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"popl %ebx\n" \
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"addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx\n" \
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"movl entrypointFunctions@GOT(%ebx), %eax\n" \
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"pop %ebx\n" \
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"jmp *(4 * " slot ")(%eax)\n"
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#elif defined(USE_X86_64_ASM)
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#define STUB_SIZE 16
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#define STUB_ASM_ARCH(slot) \
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"movq entrypointFunctions@GOTPCREL(%rip), %rax\n\t" \
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"jmp *(8 * " slot ")(%rax)\n"
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#elif defined(USE_ARMV7_ASM)
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#define STUB_SIZE 64
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#define STUB_ASM_ARCH(slot) \
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"ldr ip, 1f\n" \
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"12:\n" \
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"add ip, pc\n" \
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"push { r0 }\n" \
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"ldr r0, 1f+4\n" \
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"add ip, r0\n" \
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"pop { r0 }\n" \
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"ldr ip, [ip]\n" \
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"bx ip\n" \
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"1:\n" \
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".word entrypointFunctions - (12b + 8)\n" \
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".word " slot " * 4\n"
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#elif defined(USE_AARCH64_ASM)
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#define STUB_SIZE 16
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#define STUB_ASM_ARCH(slot) \
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"adrp x16, entrypointFunctions + " slot "*8\n" \
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"ldr x16, [x16, #:lo12:(entrypointFunctions + " slot "*8)]\n" \
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"br x16\n"
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#elif defined(USE_PPC64_ASM) && defined(_CALL_ELF) && (_CALL_ELF == 2)
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#define STUB_SIZE 32
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#define STUB_ASM_ARCH(slot) \
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"0:\n" \
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"addis 2,12,.TOC.-0b@ha\n" \
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"addi 2,2,.TOC.-0b@l\n" \
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"addis 11, 2, entrypointFunctions@got@ha\n" \
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"ld 11, entrypointFunctions@got@l(11)\n" \
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"ld 12, (" slot " * 8)(11)\n" \
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"mtctr 12\n" \
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"bctr\n"
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#else
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#error "Can't happen -- not implemented"
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#endif
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#define STUB_ASM(slot) \
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".globl glx_entrypoint_stub_" slot "\n" \
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".hidden glx_entrypoint_stub_" slot "\n" \
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".balign " U_STRINGIFY(STUB_SIZE) "\n" \
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"glx_entrypoint_stub_" slot ":\n" \
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STUB_ASM_ARCH(slot)
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__asm__(".globl glx_entrypoint_start\n"
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".hidden glx_entrypoint_start\n"
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".balign " U_STRINGIFY(STUB_SIZE) "\n" \
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"glx_entrypoint_start:\n"
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#if defined(USE_ARMV7_ASM) && defined(__thumb__)
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".arm\n"
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#endif
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#define GLX_STUBS_ASM
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#include "g_glx_dispatch_stub_list.h"
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".globl glx_entrypoint_end\n"
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".hidden glx_entrypoint_end\n"
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".balign " U_STRINGIFY(STUB_SIZE) "\n" \
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"glx_entrypoint_end:\n"
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#if defined(USE_ARMV7_ASM) && defined(__thumb__)
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".thumb\n"
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#endif
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);
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static void *DefaultDispatchFunc(void)
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{
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// Print a warning message?
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return NULL;
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}
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static GLVNDentrypointStub GetEntrypointStub(int index)
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{
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return (GLVNDentrypointStub) (glx_entrypoint_start + (index * STUB_SIZE));
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}
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GLVNDentrypointStub glvndGenerateEntrypoint(const char *procName)
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{
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int i;
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for (i=0; i<entrypointCount; i++) {
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if (strcmp(procName, entrypointNames[i]) == 0) {
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// We already generated this function, so return it.
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return GetEntrypointStub(i);
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}
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}
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if (entrypointCount >= GENERATED_ENTRYPOINT_MAX) {
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return NULL;
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}
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entrypointNames[entrypointCount] = strdup(procName);
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if (entrypointNames[entrypointCount] == NULL) {
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return NULL;
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}
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entrypointFunctions[entrypointCount] = (GLVNDentrypointStub) DefaultDispatchFunc;
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entrypointCount++;
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return GetEntrypointStub(entrypointCount - 1);
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}
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void glvndFreeEntrypoints(void)
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{
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int i;
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for (i=0; i<entrypointCount; i++) {
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free(entrypointNames[i]);
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entrypointNames[i] = NULL;
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entrypointFunctions[i] = NULL;
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}
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entrypointCount = 0;
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}
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void glvndUpdateEntrypoints(GLVNDentrypointUpdateCallback callback, void *param)
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{
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int i;
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for (i=0; i<entrypointCount; i++) {
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if (entrypointFunctions[i] == (GLVNDentrypointStub) DefaultDispatchFunc) {
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GLVNDentrypointStub addr = callback(entrypointNames[i], param);
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if (addr != NULL) {
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entrypointFunctions[i] = addr;
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}
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}
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}
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}
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#else // defined(USE_DISPATCH_ASM)
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GLVNDentrypointStub glvndGenerateEntrypoint(const char *procName)
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{
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return NULL;
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}
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void glvndFreeEntrypoints(void)
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{
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}
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void glvndUpdateEntrypoints(GLVNDentrypointUpdateCallback callback, void *param)
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{
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}
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#endif // defined(USE_DISPATCH_ASM)
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