/* SPDX-License-Identifier: GPL-2.0-only */ #include <string.h> #include <stdbool.h> #include <asan.h> void *memcpy(void *dest, const void *src, size_t n) { unsigned long d0, d1, d2; #if (ENV_SEPARATE_ROMSTAGE && CONFIG(ASAN_IN_ROMSTAGE)) || \ (ENV_RAMSTAGE && CONFIG(ASAN_IN_RAMSTAGE)) check_memory_region((unsigned long)src, n, false, _RET_IP_); check_memory_region((unsigned long)dest, n, true, _RET_IP_); #endif #if ENV_X86_64 asm volatile( "rep ; movsq\n\t" "mov %4,%%rcx\n\t" "rep ; movsb\n\t" : "=&c" (d0), "=&D" (d1), "=&S" (d2) : "0" (n >> 3), "g" (n & 7), "1" (dest), "2" (src) : "memory" ); #else asm volatile( "rep ; movsl\n\t" "movl %4,%%ecx\n\t" "rep ; movsb\n\t" : "=&c" (d0), "=&D" (d1), "=&S" (d2) : "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src) : "memory" ); #endif return dest; }