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Linux: Introduce __brk_call for invoking the brk system call
Alpha and sparc can now use the generic implementation.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
(cherry picked from commit b57ab258c1
)
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28
sysdeps/unix/sysv/linux/alpha/brk_call.h
Normal file
28
sysdeps/unix/sysv/linux/alpha/brk_call.h
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@ -0,0 +1,28 @@
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/* Invoke the brk system call. Alpha version.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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static inline void *
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__brk_call (void *addr)
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{
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unsigned long int result = INTERNAL_SYSCALL_CALL (brk, addr);
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if (result == -ENOMEM)
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/* Mimic the default error reporting behavior. */
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return addr;
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else
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return (void *) result;
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}
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@ -19,6 +19,7 @@
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#include <errno.h>
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#include <unistd.h>
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#include <sysdep.h>
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#include <brk_call.h>
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/* This must be initialized data because commons can't have aliases. */
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void *__curbrk = 0;
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@ -33,7 +34,7 @@ weak_alias (__curbrk, ___brk_addr)
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int
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__brk (void *addr)
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{
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__curbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
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__curbrk = __brk_call (addr);
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if (__curbrk < addr)
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{
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__set_errno (ENOMEM);
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25
sysdeps/unix/sysv/linux/brk_call.h
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25
sysdeps/unix/sysv/linux/brk_call.h
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@ -0,0 +1,25 @@
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/* Invoke the brk system call. Generic Linux version.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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static inline void *
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__brk_call (void *addr)
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{
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/* The default implementation reports errors through an unchanged
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break. */
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return (void *) INTERNAL_SYSCALL_CALL (brk, addr);
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}
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@ -1,5 +1,5 @@
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/* Change data segment size. Linux/Alpha.
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Copyright (C) 2020-2021 Free Software Foundation, Inc.
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/* Invoke the brk system call. Sparc version.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -16,23 +16,20 @@
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <unistd.h>
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#include <sysdep.h>
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#ifdef __arch64__
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# define SYSCALL_NUM "0x6d"
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#else
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# define SYSCALL_NUM "0x10"
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#endif
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void *__curbrk = 0;
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int
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__brk (void *addr)
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static inline void *
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__brk_call (void *addr)
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{
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/* Alpha brk returns -ENOMEM in case of failure. */
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__curbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
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if ((unsigned long) __curbrk == -ENOMEM)
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{
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__set_errno (ENOMEM);
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return -1;
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}
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return 0;
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register long int g1 asm ("g1") = __NR_brk;
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register long int o0 asm ("o0") = (long int) addr;
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asm volatile ("ta " SYSCALL_NUM
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: "=r"(o0)
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: "r"(g1), "0"(o0)
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: "cc");
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return (void *) o0;
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}
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weak_alias (__brk, brk)
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