From 720480934ab9107714f1ffc29222dfb5d3bc5b1d Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Fri, 26 Jun 2020 16:06:49 -0300 Subject: 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 --- sysdeps/unix/sysv/linux/sparc/sparc64/brk.S | 104 ---------------------------- 1 file changed, 104 deletions(-) delete mode 100644 sysdeps/unix/sysv/linux/sparc/sparc64/brk.S (limited to 'sysdeps/unix/sysv/linux/sparc/sparc64/brk.S') 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 , 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 - . */ - -/* __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 -#include - -#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) -- cgit 1.4.1