13aed4a8bSchristos /* This testcase is part of GDB, the GNU debugger. 23aed4a8bSchristos 3*56bb7041Schristos Copyright 2017-2020 Free Software Foundation, Inc. 43aed4a8bSchristos 53aed4a8bSchristos This program is free software; you can redistribute it and/or modify 63aed4a8bSchristos it under the terms of the GNU General Public License as published by 73aed4a8bSchristos the Free Software Foundation; either version 3 of the License, or 83aed4a8bSchristos (at your option) any later version. 93aed4a8bSchristos 103aed4a8bSchristos This program is distributed in the hope that it will be useful, 113aed4a8bSchristos but WITHOUT ANY WARRANTY; without even the implied warranty of 123aed4a8bSchristos MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 133aed4a8bSchristos GNU General Public License for more details. 143aed4a8bSchristos 153aed4a8bSchristos You should have received a copy of the GNU General Public License 163aed4a8bSchristos along with this program. If not, see <http://www.gnu.org/licenses/>. */ 173aed4a8bSchristos 183aed4a8bSchristos #include <stdint.h> 193aed4a8bSchristos #include <assert.h> 203aed4a8bSchristos 213aed4a8bSchristos static int again; 223aed4a8bSchristos 233aed4a8bSchristos static volatile struct 243aed4a8bSchristos { 253aed4a8bSchristos uint64_t alignment; 263aed4a8bSchristos union 273aed4a8bSchristos { 283aed4a8bSchristos uint64_t size8[1]; 293aed4a8bSchristos uint32_t size4[2]; 303aed4a8bSchristos uint16_t size2[4]; 313aed4a8bSchristos uint8_t size1[8]; 323aed4a8bSchristos uint64_t size8twice[2]; 333aed4a8bSchristos } 343aed4a8bSchristos u; 353aed4a8bSchristos } data; 363aed4a8bSchristos 373aed4a8bSchristos static int size = 0; 383aed4a8bSchristos static int offset; 393aed4a8bSchristos 403aed4a8bSchristos static void write_size8twice(void)413aed4a8bSchristoswrite_size8twice (void) 423aed4a8bSchristos { 433aed4a8bSchristos static const uint64_t first = 1; 443aed4a8bSchristos static const uint64_t second = 2; 453aed4a8bSchristos 463aed4a8bSchristos #ifdef __aarch64__ 473aed4a8bSchristos asm volatile ("stp %1, %2, [%0]" 483aed4a8bSchristos : /* output */ 493aed4a8bSchristos : "r" (data.u.size8twice), "r" (first), "r" (second) /* input */ 503aed4a8bSchristos : "memory" /* clobber */); 513aed4a8bSchristos #else 523aed4a8bSchristos data.u.size8twice[0] = first; 533aed4a8bSchristos data.u.size8twice[1] = second; 543aed4a8bSchristos #endif 553aed4a8bSchristos } 563aed4a8bSchristos 573aed4a8bSchristos int main(void)583aed4a8bSchristosmain (void) 593aed4a8bSchristos { 603aed4a8bSchristos volatile uint64_t local; 613aed4a8bSchristos 623aed4a8bSchristos assert (sizeof (data) == 8 + 2 * 8); 633aed4a8bSchristos 643aed4a8bSchristos write_size8twice (); 653aed4a8bSchristos 663aed4a8bSchristos while (size) 673aed4a8bSchristos { 683aed4a8bSchristos switch (size) 693aed4a8bSchristos { 703aed4a8bSchristos /* __s390x__ also defines __s390__ */ 713aed4a8bSchristos #ifdef __s390__ 723aed4a8bSchristos # define ACCESS(var) var = ~var 733aed4a8bSchristos #else 743aed4a8bSchristos # define ACCESS(var) local = var 753aed4a8bSchristos #endif 763aed4a8bSchristos case 8: 773aed4a8bSchristos ACCESS (data.u.size8[offset]); 783aed4a8bSchristos break; 793aed4a8bSchristos case 4: 803aed4a8bSchristos ACCESS (data.u.size4[offset]); 813aed4a8bSchristos break; 823aed4a8bSchristos case 2: 833aed4a8bSchristos ACCESS (data.u.size2[offset]); 843aed4a8bSchristos break; 853aed4a8bSchristos case 1: 863aed4a8bSchristos ACCESS (data.u.size1[offset]); 873aed4a8bSchristos break; 883aed4a8bSchristos #undef ACCESS 893aed4a8bSchristos default: 903aed4a8bSchristos assert (0); 913aed4a8bSchristos } 923aed4a8bSchristos size = 0; 933aed4a8bSchristos size = size; /* start_again */ 943aed4a8bSchristos } 953aed4a8bSchristos return 0; /* final_return */ 963aed4a8bSchristos } 97