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authorUlrich Drepper <drepper@redhat.com>1998-03-18 14:40:58 +0000
committerUlrich Drepper <drepper@redhat.com>1998-03-18 14:40:58 +0000
commit6f7638eb9dd870889e99ae61f40147b0d496cfee (patch)
tree2c3ae24ad27fed392bbb0b6e3b6e4161e150d6f2
parent0f2a261a38106184a3466d6a13d7d29cc80f7f68 (diff)
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ELF setjmp for Arm.
-rw-r--r--sysdeps/arm/elf/setjmp.S76
1 files changed, 76 insertions, 0 deletions
diff --git a/sysdeps/arm/elf/setjmp.S b/sysdeps/arm/elf/setjmp.S
new file mode 100644
index 0000000000..51572ca515
--- /dev/null
+++ b/sysdeps/arm/elf/setjmp.S
@@ -0,0 +1,76 @@
+/* setjmp for arm, ELF version.
+ Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <sysdep.h>
+#define _ASM
+#define _SETJMP_H
+#include <bits/setjmp.h>
+
+ /* We include the BSD entry points here as well but we make
+ them weak. */
+ENTRY (setjmp)
+ .weak C_SYMBOL_NAME (setjmp)
+ @ call comes here with
+ @ lr = return pc
+ @ r0 = &jump_buf
+
+ @ add a second argument into the fray
+ mov r1, #1
+ @ call the common code
+ b __sigsetjmp(PLT)
+END (setjmp)
+
+ /* Binary compatibility entry point. */
+ENTRY (_setjmp)
+ .weak C_SYMBOL_NAME (_setjmp)
+ENTRY (__setjmp)
+ @ call comes here with
+ @ lr = return pc
+ @ r0 = &jump_buf
+
+ @ add a second argument into the fray
+ mov r1, #1
+ @ fall through to the common code....
+
+ENTRY (__sigsetjmp)
+ @ save the registers into the jmp_buf....
+ stmia r0, {r1-r6, sl, fp, sp, lr}
+
+ /* Make a tail call to __sigjmp_save; it takes the same args. */
+#ifdef PIC
+ /* We cannot use the PLT, because it requires that sl==r10 be set, but
+ we can't save and restore our caller's value. Instead, we do an
+ indirect jump through the GOT, using for the temporary register
+ ip, which is call-clobbered. */
+ ldr ip, 1f
+ add ip, ip, pc
+2: @ get the address of __sigjmp_save
+ ldr r1, 3f
+ ldr ip, [ip, r1]
+ @ restore r1
+ ldr r1, [r0]
+ @ jump to *__sigjmp_save
+ mov pc, ip
+1: .word _GLOBAL_OFFSET_TABLE_ - 2b - 4
+3: .word __sigjmp_save(GOT)
+
+#else
+ b __sigjmp_save
+#endif
+END (__sigsetjmp)