2013-01-02 19:01:50 +00:00
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/* Copyright (C) 2011-2013 Free Software Foundation, Inc.
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2011-12-04 02:14:25 +00:00
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This file is part of the GNU C Library.
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Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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2012-03-09 23:56:38 +00:00
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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2011-12-04 02:14:25 +00:00
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#include <sysdep.h>
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#include <jmpbuf-offsets.h>
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#include <asm-syntax.h>
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#include <arch/spr_def.h>
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/* PL to return to via iret in longjmp */
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#define RETURN_PL 0
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.text
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ENTRY (__longjmp)
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FEEDBACK_ENTER(__longjmp)
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#define RESTORE(r) { LD r, r0 ; ADDI_PTR r0, r0, REGSIZE }
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FOR_EACH_CALLEE_SAVED_REG(RESTORE)
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/* Make longjmp(buf, 0) return "1" instead.
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At the same time, construct our iret context; we set ICS so
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we can validly load EX_CONTEXT for iret without being
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interrupted halfway through. */
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{
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LD r2, r0 /* retrieve ICS bit from jmp_buf */
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movei r3, 1
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CMPEQI r0, r1, 0
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}
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{
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mtspr INTERRUPT_CRITICAL_SECTION, r3
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shli r2, r2, SPR_EX_CONTEXT_0_1__ICS_SHIFT
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}
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{
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mtspr EX_CONTEXT_0_0, lr
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ori r2, r2, RETURN_PL
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}
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{
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or r0, r1, r0
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mtspr EX_CONTEXT_0_1, r2
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}
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iret
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jrp lr /* Keep the backtracer happy. */
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END (__longjmp)
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