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authorWaldemar Brodkorb <wbx@openadk.org>2017-05-24 20:49:02 +0200
committerWaldemar Brodkorb <wbx@openadk.org>2017-06-23 23:46:04 +0200
commit041cdc2769407c4d3869b218ad7ee7638e1c306e (patch)
tree1ea25250d74dcb230cf5feee99226fc080dbd678 /libc/sysdeps/linux/sparc64/brk.S
parent58a5ba12bffad5916d9897c2870fc483f1db8282 (diff)
sparc64: add basic support
No NPTL, no LDSO support. Bootup with Busybox Ash in Qemu working. Testuite shows only two failures, but mksh continue/break support doesn't work.
Diffstat (limited to 'libc/sysdeps/linux/sparc64/brk.S')
-rw-r--r--libc/sysdeps/linux/sparc64/brk.S101
1 files changed, 101 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sparc64/brk.S b/libc/sysdeps/linux/sparc64/brk.S
new file mode 100644
index 000000000..2d857af6c
--- /dev/null
+++ b/libc/sysdeps/linux/sparc64/brk.S
@@ -0,0 +1,101 @@
+/* Copyright (C) 1997-2017 Free Software Foundation, Inc.
+ 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
+ <http://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>
+#define _ERRNO_H
+#include <bits/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
+ call HIDDEN_JUMPTARGET(__errno_location)
+ mov %o0,%l1
+ st %l1, [%o0]
+#endif
+ sub %g0, 1, %i0
+ jmpl %i7+8, %g0
+ restore
+END (__brk)
+
+weak_alias (__brk, brk)
+libc_hidden_def(brk)