2 * U-boot - entry.h Routines for context saving and restoring
4 * Copyright (c) 2005-2007 Analog Devices Inc.
6 * See file CREDITS for list of people who contributed to this
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
25 #ifndef __BLACKFIN_ENTRY_H
26 #define __BLACKFIN_ENTRY_H
28 #include <linux/config.h>
29 #include <asm/setup.h>
32 * Stack layout in 'ret_from_exception':
37 * Register %p2 is now set to the current task throughout
43 #define LFLUSH_I_AND_D 0x00000808
46 /* process bits for task_struct.flags */
47 #define PF_TRACESYS_OFF 3
48 #define PF_TRACESYS_BIT 5
49 #define PF_PTRACED_OFF 3
50 #define PF_PTRACED_BIT 4
51 #define PF_DTRACE_OFF 1
52 #define PF_DTRACE_BIT 5
56 #if defined(NEW_PT_REGS)
58 #define SAVE_ALL_INT save_context_no_interrupts
59 #define SAVE_ALL_SYS save_context_no_interrupts
60 #define SAVE_CONTEXT save_context_with_interrupts
62 #define RESTORE_ALL restore_context_no_interrupts
63 #define RESTORE_ALL_SYS restore_context_no_interrupts
64 #define RESTORE_CONTEXT restore_context_with_interrupts
68 #define SAVE_ALL_INT save_all_int
69 #define SAVE_ALL_SYS save_all_sys
70 #define SAVE_CONTEXT save_context
71 #define RESTORE_ALL restore_context
72 #define RESTORE_CONTEXT restore_context
77 * Code to save processor context.
78 * We even save the register which are preserved by a function call
79 * - r4, r5, r6, r7, p3, p4, p5
81 .macro save_context_with_interrupts
83 [--sp] = ( R7:0, P5:0 );
120 [--sp] = r0; /* Skip reserved */
128 [--sp] = r0; /* Skip IPEND as well. */
131 .macro save_context_no_interrupts
133 [--sp] = ( R7:0, P5:0 );
170 [--sp] = r0; /* Skip reserved */
179 [--sp] = r0; /* Skip IPEND as well. */
182 .macro restore_context_no_interrupts
231 ( R7 : 0, P5 : 0) = [ SP ++ ];
235 .macro restore_context_with_interrupts
283 ( R7 : 0, P5 : 0) = [ SP ++ ];
287 #if !defined(NEW_PT_REGS)
289 * a -1 in the orig_r0 field signifies
290 * that the stack frame is NOT for syscall
293 /* reserved and disable the single step of SYSCFG, by Steven Chen 03/07/10 */
295 r0.l = 0x30; /* Errata for BF533 */
297 syscfg = r0; /* disable single step flag in SYSCFG */
299 [--sp] = syscfg; /* store SYSCFG */
301 [--sp] = r0; /* Reserved for IPEND */
315 [--sp] = retx; /* current pc when exception happens */
316 [--sp] = ( r7:5, p5:0 );
333 [--sp] = retx; /* current pc when exception happens */
334 [--sp] = ( r7:5, p5:0 );
346 ( r7:5, p5:0 ) = [sp++];
355 sp += 4; /* orig r0 */
360 sp +=4; /* Skip the IPEND */
368 #define STR(X) STR1(X)
371 #if defined(NEW_PT_REGS)
372 #define PT_OFF_ORIG_R0 208
375 #define PT_OFF_ORIG_R0 0x54
376 #define PT_OFF_SR 0x38 /* seqstat in pt_regs */