context.S
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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