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>

36 files changed, 60 insertions, 745 deletions

diff --git a/sysdeps/unix/sysv/linux/aarch64/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
index 319a7c7ac5..e526328ea4 100644
--- a/sysdeps/unix/sysv/linux/aarch64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/aarch64/sysdep.h
@@ -234,6 +234,9 @@
 # define INTERNAL_SYSCALL_NCS(number, nr, args...)	\
 	INTERNAL_SYSCALL_RAW (number, nr, args)
 
+#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 #endif	/* __ASSEMBLER__ */
 
 /* Pointer mangling is supported for AArch64.  */
diff --git a/sysdeps/unix/sysv/linux/alpha/brk.S b/sysdeps/unix/sysv/linux/alpha/brk.S
deleted file mode 100644
index 5596b346d8..0000000000
--- a/sysdeps/unix/sysv/linux/alpha/brk.S
+++ /dev/null
@@ -1,83 +0,0 @@
-/* Copyright (C) 1993-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Brendan Kehoe <brendan@zen.org>, 1993.
-
-   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 3
-	.globl __curbrk
-__curbrk: .skip 8
-	.type __curbrk,@object
-	.size __curbrk,8
-#else
-.comm __curbrk, 8
-#endif
-
-	.text
-	.align	4
-	.globl	__brk
-	.ent	__brk
-	.usepv	__brk, std
-
-	cfi_startproc
-__brk:
-	ldgp	gp, 0(t12)
-	subq	sp, 16, sp
-	cfi_adjust_cfa_offset (16)
-#ifdef PROF
-	.set noat
-	lda	AT, _mcount
-	jsr	AT, (AT), _mcount
-	.set at
-#endif
-
-	/* Save the requested brk across the system call.  */
-	stq	a0, 0(sp)
-
-	ldiq	v0, __NR_brk
-	call_pal PAL_callsys
-
-	ldq	a0, 0(sp)
-	addq	sp, 16, sp
-	cfi_adjust_cfa_offset (-16)
-
-	/* Be prepared for an OSF-style brk.  */
-	bne	a3, SYSCALL_ERROR_LABEL
-	beq	v0, $ok
-
-	/* Correctly handle the brk(0) query case.  */
-	cmoveq	a0, v0, a0
-	xor	a0, v0, t0
-	lda	v0, ENOMEM
-	bne	t0, SYSCALL_ERROR_LABEL
-
-	/* Update __curbrk and return cleanly.  */
-	lda	v0, 0
-$ok:	stq	a0, __curbrk
-	ret
-
-PSEUDO_END(__brk)
-	cfi_endproc
-
-weak_alias (__brk, brk)
diff --git a/sysdeps/unix/sysv/linux/arm/brk.c b/sysdeps/unix/sysv/linux/alpha/brk.c
index d4878939ae..d105a50724 100644
--- a/sysdeps/unix/sysv/linux/arm/brk.c
+++ b/sysdeps/unix/sysv/linux/alpha/brk.c
@@ -1,5 +1,5 @@
-/* brk system call for Linux/ARM.
-   Copyright (C) 1995-2020 Free Software Foundation, Inc.
+/* Change data segment size.  Linux/Alpha.
+   Copyright (C) 2020 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -20,17 +20,14 @@
 #include <unistd.h>
 #include <sysdep.h>
 
-/* This must be initialized data because commons can't have aliases.  */
 void *__curbrk = 0;
 
 int
 __brk (void *addr)
 {
-  void *newbrk;
-
-  __curbrk = newbrk = (void *) INLINE_SYSCALL (brk, 1, addr);
-
-  if (newbrk < addr)
+  /* Alpha brk returns -ENOMEM in case of failure.  */
+  __curbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
+  if ((unsigned long) __curbrk == -ENOMEM)
     {
       __set_errno (ENOMEM);
       return -1;
diff --git a/sysdeps/unix/sysv/linux/alpha/dl-brk.S b/sysdeps/unix/sysv/linux/alpha/dl-brk.S
deleted file mode 100644
index eeb96544e3..0000000000
--- a/sysdeps/unix/sysv/linux/alpha/dl-brk.S
+++ /dev/null
@@ -1 +0,0 @@
-#include <brk.S>
diff --git a/sysdeps/unix/sysv/linux/arc/sysdep.h b/sysdeps/unix/sysv/linux/arc/sysdep.h
index 8465a2f623..24d8866d66 100644
--- a/sysdeps/unix/sysv/linux/arc/sysdep.h
+++ b/sysdeps/unix/sysv/linux/arc/sysdep.h
@@ -221,6 +221,9 @@ hidden_proto (__syscall_error)
 # define PTR_MANGLE(var) (void) (var)
 # define PTR_DEMANGLE(var) (void) (var)
 
+# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+# define HAVE_INTERNAL_BRK_ADDR_SYMBOL  1
+
 #endif /* !__ASSEMBLER__ */
 
 #endif /* linux/arc/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/generic/brk.c b/sysdeps/unix/sysv/linux/brk.c
index 40a80ab970..0b6d6d0b70 100644
--- a/sysdeps/unix/sysv/linux/generic/brk.c
+++ b/sysdeps/unix/sysv/linux/brk.c
@@ -1,6 +1,6 @@
-/* Copyright (C) 2011-2020 Free Software Foundation, Inc.
+/* Change data segment.  Linux generic version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -23,10 +23,12 @@
 /* This must be initialized data because commons can't have aliases.  */
 void *__curbrk = 0;
 
+#if HAVE_INTERNAL_BRK_ADDR_SYMBOL
 /* 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)
+#endif
 
 int
 __brk (void *addr)
diff --git a/sysdeps/unix/sysv/linux/csky/sysdep.h b/sysdeps/unix/sysv/linux/csky/sysdep.h
index 7e8e89dd42..92216572a6 100644
--- a/sysdeps/unix/sysv/linux/csky/sysdep.h
+++ b/sysdeps/unix/sysv/linux/csky/sysdep.h
@@ -461,6 +461,9 @@ __local_syscall_error:				\
 # define INTERNAL_SYSCALL_NCS(number, nr, args...)		\
   INTERNAL_SYSCALL_RAW##nr (number, args)
 
+#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 #endif /* __ASSEMBLER__ */
 
 /* Pointer mangling support.  */
diff --git a/sysdeps/unix/sysv/linux/dl-brk.c b/sysdeps/unix/sysv/linux/dl-brk.c
deleted file mode 100644
index c37cdfec33..0000000000
--- a/sysdeps/unix/sysv/linux/dl-brk.c
+++ /dev/null
@@ -1,5 +0,0 @@
-/* We can use the normal code but we also know the __curbrk is not exported
-   from ld.so.  */
-extern void *__curbrk attribute_hidden;
-
-#include <brk.c>
diff --git a/sysdeps/unix/sysv/linux/hppa/brk.c b/sysdeps/unix/sysv/linux/hppa/brk.c
deleted file mode 100644
index 89d1fd1835..0000000000
--- a/sysdeps/unix/sysv/linux/hppa/brk.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/* brk system call for Linux/HPPA.
-   Copyright (C) 1995-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   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;
-
-int
-__brk (void *addr)
-{
-  void *newbrk;
-
-  __curbrk = newbrk = (void *) INLINE_SYSCALL (brk, 1, addr);
-
-  if (newbrk < addr)
-    {
-      __set_errno (ENOMEM);
-      return -1;
-    }
-
-  return 0;
-}
-weak_alias (__brk, brk)
diff --git a/sysdeps/unix/sysv/linux/i386/brk.c b/sysdeps/unix/sysv/linux/i386/brk.c
index 021b6d37a0..8d7b7d42cc 100644
--- a/sysdeps/unix/sysv/linux/i386/brk.c
+++ b/sysdeps/unix/sysv/linux/i386/brk.c
@@ -21,25 +21,4 @@
 # define I386_USE_SYSENTER 0
 #endif
 
-#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 = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
-  __curbrk = newbrk;
-  if (newbrk < addr)
-    return INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOMEM);
-  return 0;
-}
-weak_alias (__brk, brk)
+#include <sysdeps/unix/sysv/linux/brk.c>
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h
index bfb5de3b45..addd13dff1 100644
--- a/sysdeps/unix/sysv/linux/i386/sysdep.h
+++ b/sysdeps/unix/sysv/linux/i386/sysdep.h
@@ -291,6 +291,9 @@ struct libc_do_syscall_args
 # define HAVE_TIME_VSYSCALL             "__vdso_time"
 # define HAVE_CLOCK_GETRES_VSYSCALL     "__vdso_clock_getres"
 
+# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 /* Define a macro which expands inline into the wrapper code for a system
    call.  This use is for internal calls that do not need to handle errors
    normally.  It will never touch errno.  This returns just what the kernel
diff --git a/sysdeps/unix/sysv/linux/ia64/brk.S b/sysdeps/unix/sysv/linux/ia64/brk.S
deleted file mode 100644
index 734d3467a7..0000000000
--- a/sysdeps/unix/sysv/linux/ia64/brk.S
+++ /dev/null
@@ -1,50 +0,0 @@
-/* brk system call for Linux/ia64
-   Copyright (C) 1999-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Written by Stéphane Eranian <eranian@hpl.hp.com> and
-	      Jes Sorensen, <Jes.Sorensen@cern.ch>, April 1999.
-
-   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 <sysdep.h>
-
-#include <asm/errno.h>
-
-	.global __curbrk
-	.type __curbrk,@object
-	.size __curbrk,8
-	.data
-	.align	8
-__curbrk:
-	data8	0
-
-weak_alias (__curbrk, ___brk_addr)
-
-LEAF(__brk)
-	.regstk 1, 0, 0, 0
-	DO_CALL(__NR_brk)
-	cmp.ltu	p6, p0 = ret0, in0
-	addl r9 = @ltoff(__curbrk), gp
-	;;
-	ld8 r9 = [r9]
-(p6) 	mov ret0 = ENOMEM
-(p6)	br.cond.spnt.few __syscall_error
-	;;
-	st8 [r9] = ret0
-	mov ret0 = 0
-	ret
-END(__brk)
-
-weak_alias (__brk, brk)
diff --git a/sysdeps/unix/sysv/linux/ia64/dl-brk.S b/sysdeps/unix/sysv/linux/ia64/dl-brk.S
deleted file mode 100644
index eeb96544e3..0000000000
--- a/sysdeps/unix/sysv/linux/ia64/dl-brk.S
+++ /dev/null
@@ -1 +0,0 @@
-#include <brk.S>
diff --git a/sysdeps/unix/sysv/linux/ia64/sysdep.h b/sysdeps/unix/sysv/linux/ia64/sysdep.h
index 03ed52552e..e6bcaabecc 100644
--- a/sysdeps/unix/sysv/linux/ia64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/ia64/sysdep.h
@@ -172,6 +172,9 @@
 
 #else /* not __ASSEMBLER__ */
 
+#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 #define BREAK_INSN_1(num) "break " #num ";;\n\t"
 #define BREAK_INSN(num) BREAK_INSN_1(num)
 
diff --git a/sysdeps/unix/sysv/linux/m68k/brk.c b/sysdeps/unix/sysv/linux/m68k/brk.c
deleted file mode 100644
index ee88acbdc4..0000000000
--- a/sysdeps/unix/sysv/linux/m68k/brk.c
+++ /dev/null
@@ -1,46 +0,0 @@
-/* brk system call for Linux/m68k.
-   Copyright (C) 1996-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   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>
-
-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/x86 ELF
-   dynamic linker.  Sigh.  */
-weak_alias (__curbrk, ___brk_addr)
-
-int
-__brk (void *addr)
-{
-  void *newbrk;
-
-  newbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
-  __curbrk = newbrk;
-
-  if (newbrk < addr)
-    {
-      __set_errno (ENOMEM);
-      return -1;
-    }
-
-  return 0;
-}
-weak_alias (__brk, brk)
diff --git a/sysdeps/unix/sysv/linux/m68k/sysdep.h b/sysdeps/unix/sysv/linux/m68k/sysdep.h
index 3e0ab605de..fe7cf5babb 100644
--- a/sysdeps/unix/sysv/linux/m68k/sysdep.h
+++ b/sysdeps/unix/sysv/linux/m68k/sysdep.h
@@ -292,6 +292,9 @@ SYSCALL_ERROR_LABEL:							      \
   LOAD_REGS_5
 #define ASM_ARGS_6	ASM_ARGS_5, "a" (_a0)
 
+#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 #endif /* not __ASSEMBLER__ */
 
 /* Pointer mangling is not yet supported for M68K.  */
diff --git a/sysdeps/unix/sysv/linux/microblaze/brk.c b/sysdeps/unix/sysv/linux/microblaze/brk.c
deleted file mode 100644
index 20c3e625e4..0000000000
--- a/sysdeps/unix/sysv/linux/microblaze/brk.c
+++ /dev/null
@@ -1,42 +0,0 @@
-/* Copyright (C) 2011-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   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)
-{
-  __curbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
-  if (__curbrk < addr)
-    {
-      __set_errno (ENOMEM);
-      return -1;
-    }
-
-  return 0;
-}
-weak_alias (__brk, brk)
diff --git a/sysdeps/unix/sysv/linux/microblaze/sysdep.h b/sysdeps/unix/sysv/linux/microblaze/sysdep.h
index 6fd96adbf0..fb1e648b63 100644
--- a/sysdeps/unix/sysv/linux/microblaze/sysdep.h
+++ b/sysdeps/unix/sysv/linux/microblaze/sysdep.h
@@ -310,6 +310,9 @@ SYSCALL_ERROR_LABEL_DCL:                            \
 
 # define SINGLE_THREAD_BY_GLOBAL	1
 
+#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 #endif /* not __ASSEMBLER__ */
 
 #endif /* _LINUX_MICROBLAZE_SYSDEP_H */
diff --git a/sysdeps/unix/sysv/linux/mips/brk.c b/sysdeps/unix/sysv/linux/mips/brk.c
deleted file mode 100644
index 0335837948..0000000000
--- a/sysdeps/unix/sysv/linux/mips/brk.c
+++ /dev/null
@@ -1,46 +0,0 @@
-/* brk system call for Linux/MIPS.
-   Copyright (C) 2000-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   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>
-
-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/x86 ELF
-   dynamic linker.  Sigh.  */
-weak_alias (__curbrk, ___brk_addr)
-
-int
-__brk (void *addr)
-{
-  void *newbrk;
-
-  newbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
-  __curbrk = newbrk;
-
-  if (newbrk < addr)
-    {
-      __set_errno (ENOMEM);
-      return -1;
-    }
-
-  return 0;
-}
-weak_alias (__brk, brk)
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h b/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
index c5bcd90c25..49856c3249 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h
@@ -43,6 +43,9 @@
 
 #else   /* ! __ASSEMBLER__ */
 
+#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 /* Note that the original Linux syscall restart convention required the
    instruction immediately preceding SYSCALL to initialize $v0 with the
    syscall number.  Then if a restart triggered, $v0 would have been
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/sysdep.h b/sysdeps/unix/sysv/linux/mips/mips64/sysdep.h
index 1882fe4e73..73816816d5 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/mips/mips64/sysdep.h
@@ -41,6 +41,9 @@
 
 #else   /* ! __ASSEMBLER__ */
 
+#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 #if _MIPS_SIM == _ABIN32
 /* Convert X to a long long, without losing any bits if it is one
    already or warning if it is a 32-bit pointer.  */
diff --git a/sysdeps/unix/sysv/linux/nios2/sysdep.h b/sysdeps/unix/sysv/linux/nios2/sysdep.h
index 520c9460a2..51f736fb95 100644
--- a/sysdeps/unix/sysv/linux/nios2/sysdep.h
+++ b/sysdeps/unix/sysv/linux/nios2/sysdep.h
@@ -219,6 +219,9 @@
 
 #define __SYSCALL_CLOBBERS "memory"
 
+#undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+#define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 #endif /* __ASSEMBLER__ */
 
 /* Pointer mangling support.  */
diff --git a/sysdeps/unix/sysv/linux/powerpc/dl-brk.S b/sysdeps/unix/sysv/linux/powerpc/dl-brk.S
deleted file mode 100644
index eeb96544e3..0000000000
--- a/sysdeps/unix/sysv/linux/powerpc/dl-brk.S
+++ /dev/null
@@ -1 +0,0 @@
-#include <brk.S>
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/brk.S b/sysdeps/unix/sysv/linux/powerpc/powerpc32/brk.S
deleted file mode 100644
index f3b960795e..0000000000
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/brk.S
+++ /dev/null
@@ -1,52 +0,0 @@
-/* brk system call for Linux/ppc.
-   Copyright (C) 1995-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   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 <sysdep.h>
-#define _ERRNO_H	1
-#include <bits/errno.h>
-
-	.comm	__curbrk,4,4
-	.section ".text"
-ENTRY (__brk)
-	mflr	r0
-	stwu    r1,-16(r1)
-	cfi_adjust_cfa_offset (16)
-	stw	r3,8(r1)
-	stw	r0,20(r1)
-	cfi_offset (lr, 4)
-	DO_CALL(SYS_ify(brk))
-	lwz     r6,8(r1)
-#ifdef PIC
-	SETUP_GOT_ACCESS(r5,got_label)
-	addis	r5,r5,__curbrk-got_label@ha
-	stw	r3,__curbrk-got_label@l(r5)
-#else
-	lis     r4,__curbrk@ha
-	stw     r3,__curbrk@l(r4)
-#endif
-	lwz	r0,20(r1)
-	cmplw   r6,r3
-	addi    r1,r1,16
-	mtlr	r0
-	li	r3,0
-	blelr+
-	li      r3,ENOMEM
-	b	__syscall_error@local
-END (__brk)
-
-weak_alias (__brk, brk)
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/brk.S b/sysdeps/unix/sysv/linux/powerpc/powerpc64/brk.S
deleted file mode 100644
index f206909b72..0000000000
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/brk.S
+++ /dev/null
@@ -1,43 +0,0 @@
-/* brk system call for Linux.  PowerPC64 version.
-   Copyright (C) 1995-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   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 <sysdep.h>
-#define _ERRNO_H	1
-#include <bits/errno.h>
-
-	.comm	__curbrk,8,8
-	.section	".toc","aw"
-.LC__curbrk:
-	.tc __curbrk[TC],__curbrk
-	.section ".text"
-ENTRY (__brk)
-	CALL_MCOUNT 1
-
-	std	r3,-8(r1)
-	DO_CALL(SYS_ify(brk))
-	ld	r6,-8(r1)
-	ld	r5,.LC__curbrk@toc(r2)
-	std     r3,0(r5)
-	cmpld   r6,r3
-	li	r3,0
-	blelr+
-	li      r3,ENOMEM
-	TAIL_CALL_SYSCALL_ERROR
-END (__brk)
-
-weak_alias (__brk, brk)
diff --git a/sysdeps/unix/sysv/linux/riscv/sysdep.h b/sysdeps/unix/sysv/linux/riscv/sysdep.h
index e94afbf106..37ff07a0d7 100644
--- a/sysdeps/unix/sysv/linux/riscv/sysdep.h
+++ b/sysdeps/unix/sysv/linux/riscv/sysdep.h
@@ -155,6 +155,9 @@
    RV64).  */
 # define HAVE_GETCPU_VSYSCALL		"__vdso_getcpu"
 
+# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 # define INTERNAL_SYSCALL(name, nr, args...) \
 	internal_syscall##nr (SYS_ify (name), args)
 
diff --git a/sysdeps/unix/sysv/linux/s390/brk.c b/sysdeps/unix/sysv/linux/s390/brk.c
deleted file mode 100644
index ca3a730f83..0000000000
--- a/sysdeps/unix/sysv/linux/s390/brk.c
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
-   Copyright (C) 2000-2020 Free Software Foundation, Inc.
-   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
-   This file is part of the GNU C Library.
-
-   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>
-
-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/x86 ELF
-   dynamic linker.  Sigh.  */
-weak_alias (__curbrk, ___brk_addr)
-
-int
-__brk (void *addr)
-{
-  void *newbrk;
-
-  {
-    register void *__addr __asm__("2") = addr;
-
-    __asm__ ("svc  %b1\n\t"		/* call sys_brk */
-	     : "=d" (__addr)
-	     : "I" (SYS_ify(brk)), "r" (__addr)
-	     : "cc", "memory" );
-    newbrk = __addr;
-  }
-  __curbrk = newbrk;
-
-  if (newbrk < addr)
-    {
-      __set_errno (ENOMEM);
-      return -1;
-    }
-
-  return 0;
-}
-weak_alias (__brk, brk)
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
index 26b0410cf3..26836620f2 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
@@ -175,6 +175,11 @@
 #define ret_ERRVAL							      \
     br      14
 
+#else
+
+# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 #endif /* __ASSEMBLER__ */
 
 /* Pointer mangling support.  */
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
index 39831a2ec2..7211dadbfd 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
@@ -173,6 +173,11 @@
 #define ret_ERRVAL							      \
     br	    14
 
+#else
+
+# undef HAVE_INTERNAL_BRK_ADDR_SYMBOL
+# define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1
+
 #endif /* __ASSEMBLER__ */
 
 /* Pointer mangling support.  */
diff --git a/sysdeps/unix/sysv/linux/sh/brk.c b/sysdeps/unix/sysv/linux/sh/brk.c
deleted file mode 100644
index 5225d9bfc4..0000000000
--- a/sysdeps/unix/sysv/linux/sh/brk.c
+++ /dev/null
@@ -1,47 +0,0 @@
-/* brk system call for Linux/SH.
-   Copyright (C) 1999-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   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;
-
-int
-__brk (void *addr)
-{
-  void *newbrk;
-  register long r3 asm ("%r3") = SYS_ify (brk);
-  register long r4 asm ("%r4") = (long)addr;
-
-  asm volatile ("trapa #0x11\n\t" SYSCALL_INST_PAD
-		: "=z"(newbrk)
-		: "r" (r3), "r" (r4));
-
-  __curbrk = newbrk;
-
-  if (newbrk < addr)
-    {
-      __set_errno (ENOMEM);
-      return -1;
-    }
-
-  return 0;
-}
-weak_alias (__brk, brk)
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/brk.c b/sysdeps/unix/sysv/linux/sparc/sparc32/brk.c
deleted file mode 100644
index ba9a616f74..0000000000
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/brk.c
+++ /dev/null
@@ -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)
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.h b/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.h
index 2c3754770b..018ee5781e 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.h
@@ -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.  */
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/brk.S b/sysdeps/unix/sysv/linux/sparc/sparc64/brk.S
deleted file mode 100644
index 471da3d268..0000000000
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/brk.S
+++ /dev/null
@@ -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)
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/dl-brk.S b/sysdeps/unix/sysv/linux/sparc/sparc64/dl-brk.S
deleted file mode 100644
index eeb96544e3..0000000000
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/dl-brk.S
+++ /dev/null
@@ -1 +0,0 @@
-#include <brk.S>
diff --git a/sysdeps/unix/sysv/linux/sysdep.h b/sysdeps/unix/sysv/linux/sysdep.h
index 71ecc19cd5..736cf52697 100644
--- a/sysdeps/unix/sysv/linux/sysdep.h
+++ b/sysdeps/unix/sysv/linux/sysdep.h
@@ -99,4 +99,8 @@
    it missing due the usage of a old generic version without it).  */
 #define HAVE_INTERNAL_SEND_SYMBOL	1
 
+/* Export the ___brk_addr symbol on brk.c implementation (some ABIs export
+   it due and old crtstuff.c code).  */
+#define HAVE_INTERNAL_BRK_ADDR_SYMBOL   0
+
 #endif /* _SYSDEP_LINUX_H  */
diff --git a/sysdeps/unix/sysv/linux/x86_64/brk.c b/sysdeps/unix/sysv/linux/x86_64/brk.c
deleted file mode 100644
index fba9278c68..0000000000
--- a/sysdeps/unix/sysv/linux/x86_64/brk.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/* brk system call for Linux/x86_64.
-   Copyright (C) 1995-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   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;
-
-int
-__brk (void *addr)
-{
-  void *newbrk;
-
-  __curbrk = newbrk = (void *) INLINE_SYSCALL (brk, 1, addr);
-
-  if (newbrk < addr)
-    {
-      __set_errno (ENOMEM);
-      return -1;
-    }
-
-  return 0;
-}
-weak_alias (__brk, brk)