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>

4 files changed, 3 insertions, 159 deletions

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>