1 /* Change data segment. Linux SPARC version. 2 Copyright (C) 2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library. If not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <errno.h> 20 #include <unistd.h> 21 #include <sysdep.h> 22 23 /* This must be initialized data because commons can't have aliases. */ 24 void *__curbrk = 0; 25 26 #if HAVE_INTERNAL_BRK_ADDR_SYMBOL 27 /* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt 28 to work around different old braindamage in the old Linux ELF dynamic 29 linker. */ weak_alias(__curbrk,___brk_addr)30weak_alias (__curbrk, ___brk_addr) 31 #endif 32 33 #ifdef __arch64__ 34 # define SYSCALL_NUM "0x6d" 35 #else 36 # define SYSCALL_NUM "0x10" 37 #endif 38 39 int 40 __brk (void *addr) 41 { 42 register long int g1 asm ("g1") = __NR_brk; 43 register long int o0 asm ("o0") = (long int) addr; 44 asm volatile ("ta " SYSCALL_NUM 45 : "=r"(o0) 46 : "r"(g1), "0"(o0) 47 : "cc"); 48 __curbrk = (void *) o0; 49 50 if (__curbrk < addr) 51 { 52 __set_errno (ENOMEM); 53 return -1; 54 } 55 56 return 0; 57 } 58 weak_alias (__brk, brk) 59