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Diffstat (limited to 'arch/blackfin/include/asm/context.S')
| -rw-r--r-- | arch/blackfin/include/asm/context.S | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/context.S b/arch/blackfin/include/asm/context.S new file mode 100644 index 00000000000..c0e630edfb9 --- /dev/null +++ b/arch/blackfin/include/asm/context.S @@ -0,0 +1,355 @@ +/* + * 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 + |