mirror of
https://sourceware.org/git/glibc.git
synced 2025-12-24 17:51:17 +03:00
linux: Consolidate brk implementation
It removes all the arch-specific assembly implementation. The outliers are alpha, where its kernel ABI explict return -ENOMEM in case of failure; and i686, where it can't use "call *%gs:SYSINFO_OFFSET" during statup in static PIE. Also some ABIs exports an additional ___brk_addr symbol and to handle it an internal HAVE_INTERNAL_BRK_ADDR_SYMBOL is added. Checked on x86_64-linux-gnu, i686-linux-gnu, adn with builsd for the affected ABIs. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
This commit is contained in:
Adhemerval Zanella
@@ -1,54 +0,0 @@
|
||||
/* brk system call for Linux/SPARC.
|
||||
Copyright (C) 1995-2020 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx)
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<https://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <errno.h>
|
||||
#include <unistd.h>
|
||||
#include <sysdep.h>
|
||||
|
||||
/* This must be initialized data because commons can't have aliases. */
|
||||
void *__curbrk = 0;
|
||||
|
||||
/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
|
||||
to work around different old braindamage in the old Linux ELF dynamic
|
||||
linker. */
|
||||
weak_alias (__curbrk, ___brk_addr)
|
||||
|
||||
int
|
||||
__brk (void *addr)
|
||||
{
|
||||
void *newbrk;
|
||||
|
||||
{
|
||||
register void *o0 __asm__("%o0") = addr;
|
||||
register int g1 __asm__("%g1") = __NR_brk;
|
||||
__asm ("t 0x10" : "=r"(o0) : "r"(g1), "0"(o0) : "cc");
|
||||
newbrk = o0;
|
||||
}
|
||||
|
||||
__curbrk = newbrk;
|
||||
|
||||
if (newbrk < addr)
|
||||
{
|
||||
__set_errno (ENOMEM);
|
||||
return -1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
weak_alias (__brk, brk)
|
||||
@@ -121,6 +121,9 @@ ENTRY(name); \
|
||||
"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
|
||||
"cc", "memory"
|
||||
|
||||
#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
|
||||
#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
|
||||
|
||||
#endif /* __ASSEMBLER__ */
|
||||
|
||||
/* Pointer mangling support. */
|
||||
|
||||
@@ -1,104 +0,0 @@
|
||||
/* Copyright (C) 1997-2020 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<https://www.gnu.org/licenses/>. */
|
||||
|
||||
/* __brk is a special syscall under Linux since it never returns an
|
||||
error. Instead, the error condition is indicated by returning the old
|
||||
break value (instead of the new, requested one). */
|
||||
|
||||
#include <sysdep.h>
|
||||
#include <errno.h>
|
||||
|
||||
#ifdef PIC
|
||||
.section .bss
|
||||
.align 8
|
||||
.globl __curbrk
|
||||
__curbrk: .skip 8
|
||||
.type __curbrk,@object
|
||||
.size __curbrk,8
|
||||
#else
|
||||
.common __curbrk, 8, 8
|
||||
#endif
|
||||
|
||||
.text
|
||||
ENTRY (__brk)
|
||||
save %sp, -192, %sp
|
||||
cfi_def_cfa_register(%fp)
|
||||
cfi_window_save
|
||||
cfi_register(%o7, %i7)
|
||||
#ifdef PIC
|
||||
SETUP_PIC_REG(l7)
|
||||
#endif
|
||||
|
||||
LOADSYSCALL(brk)
|
||||
mov %i0, %o0
|
||||
|
||||
ta 0x6d
|
||||
|
||||
/* All the ways we can fail... */
|
||||
bcs,pn %xcc, .Lerr1
|
||||
nop
|
||||
brz,pt %i0, .Lok
|
||||
subcc %i0, %o0, %g0
|
||||
bne,pn %xcc, .Lerr0
|
||||
nop
|
||||
|
||||
/* Update __curbrk and return cleanly. */
|
||||
.Lok:
|
||||
#ifndef PIC
|
||||
sethi %hi(__curbrk), %g1
|
||||
or %g1, %lo(__curbrk), %g1
|
||||
#else
|
||||
sethi %gdop_hix22(__curbrk), %g1
|
||||
xor %g1, %gdop_lox10(__curbrk), %g1
|
||||
ldx [%l7 + %g1], %g1, %gdop(__curbrk)
|
||||
#endif
|
||||
stx %o0, [%g1]
|
||||
mov %g0, %i0
|
||||
|
||||
/* Don't use "ret" cause the preprocessor will eat it. */
|
||||
jmpl %i7+8, %g0
|
||||
restore
|
||||
|
||||
/* What a horrible way to die. */
|
||||
.Lerr0: set ENOMEM, %o0
|
||||
.Lerr1:
|
||||
#ifndef _LIBC_REENTRANT
|
||||
#ifndef PIC
|
||||
sethi %hi(errno), %g1
|
||||
or %g1, %lo(errno), %g1
|
||||
#else
|
||||
sethi %gdop_hix22(errno), %g1
|
||||
xor %g1, %gdop_lox10(errno), %g1
|
||||
ldx [%l7 + %g1], %g1, %gdop(errno)
|
||||
#endif
|
||||
st %o0, [%g1]
|
||||
#else
|
||||
#if IS_IN (libc)
|
||||
call HIDDEN_JUMPTARGET(__errno_location)
|
||||
#else
|
||||
call __errno_location
|
||||
#endif
|
||||
mov %o0,%l1
|
||||
st %l1, [%o0]
|
||||
#endif
|
||||
sub %g0, 1, %i0
|
||||
jmpl %i7+8, %g0
|
||||
restore
|
||||
END (__brk)
|
||||
|
||||
weak_alias (__brk, brk)
|
||||
@@ -1 +0,0 @@
|
||||
#include <brk.S>
|
||||
Reference in New Issue
Block a user