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/* Copyright (C) 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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/>. */
#include <sysdep.h>
#include <jmpbuf-offsets.h>
#include <asm-syntax.h>
#include <arch/spr_def.h>
/* PL to return to via iret in longjmp */
#define RETURN_PL 0
.text
ENTRY (__longjmp)
FEEDBACK_ENTER(__longjmp)
#define RESTORE(r) { LD r, r0 ; ADDI_PTR r0, r0, REGSIZE }
FOR_EACH_CALLEE_SAVED_REG(RESTORE)
/* Make longjmp(buf, 0) return "1" instead.
At the same time, construct our iret context; we set ICS so
we can validly load EX_CONTEXT for iret without being
interrupted halfway through. */
{
LD r2, r0 /* retrieve ICS bit from jmp_buf */
movei r3, 1
CMPEQI r0, r1, 0
}
{
mtspr INTERRUPT_CRITICAL_SECTION, r3
shli r2, r2, SPR_EX_CONTEXT_0_1__ICS_SHIFT
}
{
mtspr EX_CONTEXT_0_0, lr
ori r2, r2, RETURN_PL
}
{
or r0, r1, r0
mtspr EX_CONTEXT_0_1, r2
}
iret
jrp lr /* Keep the backtracer happy. */
END (__longjmp)
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