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77 lines
2.2 KiB
ArmAsm
77 lines
2.2 KiB
ArmAsm
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/* setjmp for arm, ELF version.
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Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#define _ASM
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#define _SETJMP_H
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#include <bits/setjmp.h>
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/* We include the BSD entry points here as well but we make
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them weak. */
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ENTRY (setjmp)
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.weak C_SYMBOL_NAME (setjmp)
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@ call comes here with
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@ lr = return pc
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@ r0 = &jump_buf
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@ add a second argument into the fray
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mov r1, #1
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@ call the common code
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b __sigsetjmp(PLT)
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END (setjmp)
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/* Binary compatibility entry point. */
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ENTRY (_setjmp)
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.weak C_SYMBOL_NAME (_setjmp)
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ENTRY (__setjmp)
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@ call comes here with
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@ lr = return pc
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@ r0 = &jump_buf
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@ add a second argument into the fray
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mov r1, #1
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@ fall through to the common code....
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ENTRY (__sigsetjmp)
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@ save the registers into the jmp_buf....
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stmia r0, {r1-r6, sl, fp, sp, lr}
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/* Make a tail call to __sigjmp_save; it takes the same args. */
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#ifdef PIC
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/* We cannot use the PLT, because it requires that sl==r10 be set, but
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we can't save and restore our caller's value. Instead, we do an
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indirect jump through the GOT, using for the temporary register
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ip, which is call-clobbered. */
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ldr ip, 1f
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add ip, ip, pc
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2: @ get the address of __sigjmp_save
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ldr r1, 3f
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ldr ip, [ip, r1]
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@ restore r1
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ldr r1, [r0]
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@ jump to *__sigjmp_save
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mov pc, ip
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1: .word _GLOBAL_OFFSET_TABLE_ - 2b - 4
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3: .word __sigjmp_save(GOT)
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#else
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b __sigjmp_save
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#endif
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END (__sigsetjmp)
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