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-rw-r--r--arch/blackfin/include/asm/context.S355
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diff --git a/arch/blackfin/include/asm/context.S b/arch/blackfin/include/asm/context.S
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+/*
+ * File: arch/blackfin/kernel/context.S
+ * Based on:
+ * Author:
+ *
+ * Created:
+ * Description:
+ *
+ * Modified:
+ * Copyright 2004-2007 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * NOTE! The single-stepping code assumes that all interrupt handlers
+ * start by saving SYSCFG on the stack with their first instruction.
+ */
+
+/*
+ * 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] = SYSCFG;
+
+ [--sp] = P0; /*orig_p0*/
+ [--sp] = R0; /*orig_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] = r0; /* Skip IPEND as well. */
+ /* Switch to other method of keeping interrupts disabled. */
+#ifdef CONFIG_DEBUG_HWERR
+ r0 = 0x3f;
+ sti r0;
+#else
+ cli r0;
+#endif
+ [--sp] = RETI; /*orig_pc*/
+ /* Clear all L registers. */
+ r0 = 0 (x);
+ l0 = r0;
+ l1 = r0;
+ l2 = r0;
+ l3 = r0;
+.endm
+
+.macro save_context_syscall
+ [--sp] = SYSCFG;
+
+ [--sp] = P0; /*orig_p0*/
+ [--sp] = R0; /*orig_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] = r0; /* Skip IPEND as well. */
+ [--sp] = RETI; /*orig_pc*/
+ /* Clear all L registers. */
+ r0 = 0 (x);
+ l0 = r0;
+ l1 = r0;
+ l2 = r0;
+ l3 = r0;
+.endm
+
+.macro save_context_no_interrupts
+ [--sp] = SYSCFG;
+ [--sp] = P0; /* orig_p0 */
+ [--sp] = R0; /* orig_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;
+
+#ifdef CONFIG_KGDB
+ fp = 0(Z);
+ r1 = sp;
+ r1 += 60;
+ r1 += 60;
+ r1 += 60;
+ [--sp] = r1;
+#else
+ [--sp] = r0; /* Skip reserved */
+#endif
+ [--sp] = RETS;
+ r0 = RETI;
+ [--sp] = r0;
+ [--sp] = RETX;
+ [--sp] = RETN;
+ [--sp] = RETE;
+ [--sp] = SEQSTAT;
+#ifdef CONFIG_KGDB
+ r1.l = lo(IPEND);
+ r1.h = hi(IPEND);
+ [--sp] = r1;
+#else
+ [--sp] = r0; /* Skip IPEND as well. */
+#endif
+ [--sp] = r0; /*orig_pc*/
+ /* Clear all L registers. */
+ r0 = 0 (x);
+ l0 = r0;
+ l1 = r0;
+ l2 = r0;
+ l3 = r0;
+.endm
+
+.macro restore_context_no_interrupts
+ sp += 4; /* Skip orig_pc */
+ sp += 4; /* Skip IPEND */
+ SEQSTAT = [sp++];
+ RETE = [sp++];
+ RETN = [sp++];
+ RETX = [sp++];
+ r0 = [sp++];
+ RETI = r0; /* Restore RETI indirectly when in exception */
+ RETS = [sp++];
+
+ sp += 4; /* Skip Reserved */
+
+ 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 += 8; /* Skip orig_r0/orig_p0 */
+ SYSCFG = [sp++];
+.endm
+
+.macro restore_context_with_interrupts
+ sp += 4; /* Skip orig_pc */
+ sp += 4; /* Skip IPEND */
+ SEQSTAT = [sp++];
+ RETE = [sp++];
+ RETN = [sp++];
+ RETX = [sp++];
+ RETI = [sp++];
+ RETS = [sp++];
+
+ p0.h = _irq_flags;
+ p0.l = _irq_flags;
+ r0 = [p0];
+ sti r0;
+
+ sp += 4; /* Skip Reserved */
+
+ 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 += 8; /* Skip orig_r0/orig_p0 */
+ csync;
+ SYSCFG = [sp++];
+ csync;
+.endm
+