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/* * Copyright 2007-2009 Analog Devices Inc. * * Licensed under the GPL-2 or later. */ /* * 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 #ifdef CONFIG_TRACE_IRQFLAGS sp += -12; call _trace_hardirqs_off; sp += 12; #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_DEBUG_KERNEL p1.l = lo(IPEND); p1.h = hi(IPEND); r1 = [p1]; [--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++]; #ifdef CONFIG_TRACE_IRQFLAGS sp += -12; call _trace_hardirqs_on; sp += 12; #endif RETS = [sp++]; #ifdef CONFIG_SMP GET_PDA(p0, r0); r0 = [p0 + PDA_IRQFLAGS]; #else p0.h = _bfin_irq_flags; p0.l = _bfin_irq_flags; r0 = [p0]; #endif 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 .macro save_context_cplb [--sp] = (R7:0, P5:0); [--sp] = fp; [--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] = RETS; .endm .macro restore_context_cplb RETS = [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++]; fp = [sp++]; (R7:0, P5:0) = [SP++]; .endm .macro pseudo_long_call func:req, scratch:req #ifdef CONFIG_ROMKERNEL \scratch\().l = \func; \scratch\().h = \func; call (\scratch); #else call \func; #endif .endm #if defined(CONFIG_BFIN_SCRATCH_REG_RETN) # define EX_SCRATCH_REG RETN #elif defined(CONFIG_BFIN_SCRATCH_REG_RETE) # define EX_SCRATCH_REG RETE #else # define EX_SCRATCH_REG CYCLES #endif