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Diffstat (limited to 'arch/blackfin/include/asm/entry.h')
| -rw-r--r-- | arch/blackfin/include/asm/entry.h | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/entry.h b/arch/blackfin/include/asm/entry.h new file mode 100644 index 0000000000..f031c86d76 --- /dev/null +++ b/arch/blackfin/include/asm/entry.h @@ -0,0 +1,384 @@ +/* + * U-boot - 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 |