/*
* barebox - entry.h Routines for context saving and restoring
*
* Copyright (c) 2005 blackfin.uclinux.org
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef __BLACKFIN_ENTRY_H
#define __BLACKFIN_ENTRY_H
#include <asm/setup.h>
#include <asm/page.h>
/*
* Stack layout in 'ret_from_exception':
*
*/
/*
* Register %p2 is now set to the current task throughout
* the whole kernel.
*/
#ifdef __ASSEMBLY__
#define LFLUSH_I_AND_D 0x00000808
#define LSIGTRAP 5
/* process bits for task_struct.flags */
#define PF_TRACESYS_OFF 3
#define PF_TRACESYS_BIT 5
#define PF_PTRACED_OFF 3
#define PF_PTRACED_BIT 4
#define PF_DTRACE_OFF 1
#define PF_DTRACE_BIT 5
#define NEW_PT_REGS
#if defined(NEW_PT_REGS)
#define SAVE_ALL_INT save_context_no_interrupts
#define SAVE_ALL_SYS save_context_no_interrupts
#define SAVE_CONTEXT save_context_with_interrupts
#define RESTORE_ALL restore_context_no_interrupts
#define RESTORE_ALL_SYS restore_context_no_interrupts
#define RESTORE_CONTEXT restore_context_with_interrupts
#else
#define SAVE_ALL_INT save_all_int
#define SAVE_ALL_SYS save_all_sys
#define SAVE_CONTEXT save_context
#define RESTORE_ALL restore_context
#define RESTORE_CONTEXT restore_context
#endif
/*
* Code to save processor context.
* We even save the register which are preserved by a function call
* - r4, r5, r6, r7, p3, p4, p5
*/
.macro save_context_with_interrupts
[--sp] = R0;
[--sp] = ( R7:0, P5:0 );
[--sp] = fp;
[--sp] = usp;
[--sp] = i0;
[--sp] = i1;
[--sp] = i2;
[--sp] = i3;
[--sp] = m0;
[--sp] = m1;
[--sp] = m2;
[--sp] = m3;
[--sp] = l0;
[--sp] = l1;
[--sp] = l2;
[--sp] = l3;
[--sp] = b0;
[--sp] = b1;
[--sp] = b2;
[--sp] = b3;
[--sp] = a0.x;
[--sp] = a0.w;
[--sp] = a1.x;
[--sp] = a1.w;
[--sp] = LC0;
[--sp] = LC1;
[--sp] = LT0;
[--sp] = LT1;
[--sp] = LB0;
[--sp] = LB1;
[--sp] = ASTAT;
[--sp] = r0; /* Skip reserved */
[--sp] = RETS;
[--sp] = RETI;
[--sp] = RETX;
[--sp] = RETN;
[--sp] = RETE;
[--sp] = SEQSTAT;
[--sp] = SYSCFG;
[--sp] = r0; /* Skip IPEND as well. */
.endm
.macro save_context_no_interrupts
[--sp] = R0;
[--sp] = ( R7:0, P5:0 );
[--sp] = fp;
[--sp] = usp;
[--sp] = i0;
[--sp] = i1;
[--sp] = i2;
[--sp] = i3;
[--sp] = m0;
[--sp] = m1;
[--sp] = m2;
[--sp] = m3;
[--sp] = l0;
[--sp] = l1;
[--sp] = l2;
[--sp] = l3;
[--sp] = b0;
[--sp] = b1;
[--sp] = b2;
[--sp] = b3;
[--sp] = a0.x;
[--sp] = a0.w;
[--sp] = a1.x;
[--sp] = a1.w;
[--sp] = LC0;
[--sp] = LC1;
[--sp] = LT0;
[--sp] = LT1;
[--sp] = LB0;
[--sp] = LB1;
[--sp] = ASTAT;
[--sp] = r0; /* Skip reserved */
[--sp] = RETS;
r0 = RETI;
[--sp] = r0;
[--sp] = RETX;
[--sp] = RETN;
[--sp] = RETE;
[--sp] = SEQSTAT;
[--sp] = SYSCFG;
[--sp] = r0; /* Skip IPEND as well. */
.endm
.macro restore_context_no_interrupts
sp += 4;
SYSCFG = [sp++];
SEQSTAT = [sp++];
RETE = [sp++];
RETN = [sp++];
RETX = [sp++];
r0 = [sp++];
RETI = r0;
RETS = [sp++];
sp += 4;
ASTAT = [sp++];
LB1 = [sp++];
LB0 = [sp++];
LT1 = [sp++];
LT0 = [sp++];
LC1 = [sp++];
LC0 = [sp++];
a1.w = [sp++];
a1.x = [sp++];
a0.w = [sp++];
a0.x = [sp++];
b3 = [sp++];
b2 = [sp++];
b1 = [sp++];
b0 = [sp++];
l3 = [sp++];
l2 = [sp++];
l1 = [sp++];
l0 = [sp++];
m3 = [sp++];
m2 = [sp++];
m1 = [sp++];
m0 = [sp++];
i3 = [sp++];
i2 = [sp++];
i1 = [sp++];
i0 = [sp++];
sp += 4;
fp = [sp++];
( R7 : 0, P5 : 0) = [ SP ++ ];
sp += 4;
.endm
.macro restore_context_with_interrupts
sp += 4;
SYSCFG = [sp++];
SEQSTAT = [sp++];
RETE = [sp++];
RETN = [sp++];
RETX = [sp++];
RETI = [sp++];
RETS = [sp++];
sp += 4;
ASTAT = [sp++];
LB1 = [sp++];
LB0 = [sp++];
LT1 = [sp++];
LT0 = [sp++];
LC1 = [sp++];
LC0 = [sp++];
a1.w = [sp++];
a1.x = [sp++];
a0.w = [sp++];
a0.x = [sp++];
b3 = [sp++];
b2 = [sp++];
b1 = [sp++];
b0 = [sp++];
l3 = [sp++];
l2 = [sp++];
l1 = [sp++];
l0 = [sp++];
m3 = [sp++];
m2 = [sp++];
m1 = [sp++];
m0 = [sp++];
i3 = [sp++];
i2 = [sp++];
i1 = [sp++];
i0 = [sp++];
sp += 4;
fp = [sp++];
( R7 : 0, P5 : 0) = [ SP ++ ];
sp += 4;
.endm
#if !defined(NEW_PT_REGS)
/*
* a -1 in the orig_r0 field signifies
* that the stack frame is NOT for syscall
*/
.macro save_all_int
/* reserved and disable the single step of SYSCFG, by Steven Chen 03/07/10 */
[--sp] = r0;
r0.l = 0x30; /* Errata for BF533 */
r0.h = 0x0;
syscfg = r0; /* disable single step flag in SYSCFG */
r0 = [sp++];
[--sp] = syscfg; /* store SYSCFG */
[--sp] = r0; /* Reserved for IPEND */
[--sp] = fp;
[--sp] = usp;
[--sp] = r0;
[--sp] = r0;
r0 = [sp + 8];
[--sp] = a0.x;
[--sp] = a1.x;
[--sp] = a0.w;
[--sp] = a1.w;
[--sp] = rets;
[--sp] = astat;
[--sp] = seqstat;
[--sp] = retx; /* current pc when exception happens */
[--sp] = ( r7:5, p5:0 );
[--sp] = r1;
[--sp] = r2;
[--sp] = r4;
[--sp] = r3;
.endm
.macro save_all_sys
[--sp] = r0;
[--sp] = r0;
[--sp] = a0.x;
[--sp] = a1.x;
[--sp] = a0.w;
[--sp] = a1.w;
[--sp] = rets;
[--sp] = astat;
[--sp] = seqstat;
[--sp] = retx; /* current pc when exception happens */
[--sp] = ( r7:5, p5:0 );
[--sp] = r1;
[--sp] = r2;
[--sp] = r4;
[--sp] = r3;
.endm
.macro restore_all
r3 = [sp++];
r4 = [sp++];
r2 = [sp++];
r1 = [sp++];
( r7:5, p5:0 ) = [sp++];
retx = [sp++];
seqstat = [sp++];
astat = [sp++];
rets = [sp++];
a1.w = [sp++];
a0.w = [sp++];
a1.x = [sp++];
a0.x = [sp++];
sp += 4; /* orig r0 */
r0 = [sp++];
sp += 4;
fp = [sp++];
sp +=4; /* Skip the IPEND */
syscfg = [sp++];
.endm
#endif
#define STR(X) STR1(X)
#define STR1(X) #X
#if defined(NEW_PT_REGS)
#define PT_OFF_ORIG_R0 208
#define PT_OFF_SR 8
#else
#define PT_OFF_ORIG_R0 0x54
#define PT_OFF_SR 0x38 /* seqstat in pt_regs */
#endif
#endif
#endif
