* Patch by Hans-Joerg Frieden, 06 Dec 2002
Fix misc problems with AmigaOne support
* Patch by Chris Hallinan, 3 Dec 2002:
minor cleanup to the MPC8245 EPIC driver
* Patch by Pierre Aubert , 28 Nov 2002
Add support for external (SIU) interrupts on MPC8xx
* Patch by Pierre Aubert , 28 Nov 2002
Fix nested syscalls bug in standalone applications
* Patch by David Müller, 27 Nov 2002:
fix output of "pciinfo" command for CardBus bridge devices.
* Fix bug in TQM8260 board detection - boards got stuck when board ID
was not readable
diff --git a/cpu/74xx_7xx/start.S b/cpu/74xx_7xx/start.S
index fe08f8e..0d63144 100644
--- a/cpu/74xx_7xx/start.S
+++ b/cpu/74xx_7xx/start.S
@@ -177,7 +177,14 @@
add r11,r11,r0
lwz r11,0(r11)
- li r12,0xd00-4*3 /* save LR & SRRx */
+ li r20,0xd00-4 /* Get stack pointer */
+ lwz r12,0(r20)
+ subi r12,r12,12 /* Adjust stack pointer */
+ li r0,0xc00+_end_back-SystemCall
+ cmplw 0, r0, r12 /* Check stack overflow */
+ bgt 1f
+ stw r12,0(r20)
+
mflr r0
stw r0,0(r12)
mfspr r0,SRR0
@@ -202,7 +209,9 @@
mtmsr r11
SYNC
- li r12,0xd00-4*3 /* restore regs */
+ li r12,0xd00-4 /* restore regs */
+ lwz r12,0(r12)
+
lwz r11,0(r12)
mtlr r11
lwz r11,4(r12)
@@ -210,8 +219,13 @@
lwz r11,8(r12)
mtspr SRR1,r11
+ addi r12,r12,12 /* Adjust stack pointer */
+ li r20,0xd00-4
+ stw r12,0(r20)
+
SYNC
rfi
+_end_back:
STD_EXCEPTION(0xd00, SingleStep, UnknownException)
@@ -716,6 +730,9 @@
bne 5b
6:
mr r3, r10 /* Destination Address */
+#ifdef CONFIG_AMIGAONEG3SE
+ mr r4, r9 /* Use RAM copy of the global data */
+#endif
bl after_reloc
/* not reached - end relocate_code */
diff --git a/cpu/mpc824x/drivers/epic/epic.h b/cpu/mpc824x/drivers/epic/epic.h
index 7751db2..17e4afb 100644
--- a/cpu/mpc824x/drivers/epic/epic.h
+++ b/cpu/mpc824x/drivers/epic/epic.h
@@ -108,6 +108,9 @@
#define EPIC_PROC_INT_ACK_REG (EPIC_EUMBBAR + 0x200a0)/* Int. acknowledge */
#define EPIC_PROC_EOI_REG (EPIC_EUMBBAR + 0x200b0)/* End of interrupt */
+#define EPIC_VEC_PRI_MASK 0x80000000 /* Mask Interrupt bit in IVPR */
+#define EPIC_VEC_PRI_DFLT_PRI 8 /* Interrupt Priority in IVPR */
+
/* Error code */
#define OK 0
diff --git a/cpu/mpc824x/drivers/epic/epic1.c b/cpu/mpc824x/drivers/epic/epic1.c
index 362e129..eb7ed40 100644
--- a/cpu/mpc824x/drivers/epic/epic1.c
+++ b/cpu/mpc824x/drivers/epic/epic1.c
@@ -70,6 +70,10 @@
tmp = sysEUMBBARRead(EPIC_GLOBAL_REG);
tmp |= 0xa0000000; /* Set the Global Conf. register */
sysEUMBBARWrite(EPIC_GLOBAL_REG, tmp);
+ /*
+ * Wait for EPIC to reset - CLH
+ */
+ while( (sysEUMBBARRead(EPIC_GLOBAL_REG) & 0x80000000) == 1);
sysEUMBBARWrite(EPIC_GLOBAL_REG, 0x20000000);
tmp = sysEUMBBARRead(EPIC_INT_CONF_REG); /* Read interrupt conf. reg */
@@ -81,7 +85,8 @@
sysEUMBBARWrite(EPIC_INT_CONF_REG, tmp);
}
- while (epicIntAck() != 0xff); /* Clear all pending interrupts */
+ while (epicIntAck() != 0xff) /* Clear all pending interrupts */
+ epicEOI();
}
/****************************************************************************
@@ -92,18 +97,18 @@
*
* RETURNS: None
*/
-void epicIntEnable
- (
- int intVec /* Interrupt Vector Number */
- )
- {
+void epicIntEnable(int intVec)
+{
ULONG tmp;
ULONG srAddr;
srAddr = SrcVecTable[intVec].srcAddr; /* Retrieve src Vec/Prio register */
tmp = sysEUMBBARRead(srAddr);
- tmp &= 0x7fffffff; /* Clear the mask bit */
+ tmp &= ~EPIC_VEC_PRI_MASK; /* Clear the mask bit */
+ tmp |= (EPIC_VEC_PRI_DFLT_PRI << 16); /* Set priority to Default - CLH */
+ tmp |= intVec; /* Set Vector number */
sysEUMBBARWrite(srAddr, tmp);
+
return;
}
diff --git a/cpu/mpc824x/interrupts.c b/cpu/mpc824x/interrupts.c
index 2011671..12841b3 100644
--- a/cpu/mpc824x/interrupts.c
+++ b/cpu/mpc824x/interrupts.c
@@ -92,6 +92,8 @@
*/
epicInit (EPIC_DIRECT_IRQ, 0);
+ /* EPIC won't generate INT unless Current Task Pri < 15 */
+ epicCurTaskPrioSet(0);
set_dec (decrementer_count);
diff --git a/cpu/mpc824x/start.S b/cpu/mpc824x/start.S
index bd9706d..18b8e61 100644
--- a/cpu/mpc824x/start.S
+++ b/cpu/mpc824x/start.S
@@ -278,7 +278,14 @@
add r11,r11,r0
lwz r11,0(r11)
- li r12,0xd00-4*3 /* save LR & SRRx */
+ li r20,0xd00-4 /* Get stack pointer */
+ lwz r12,0(r20)
+ subi r12,r12,12 /* Adjust stack pointer */
+ li r0,0xc00+_end_back-SystemCall
+ cmplw 0, r0, r12 /* Check stack overflow */
+ bgt 1f
+ stw r12,0(r20)
+
mflr r0
stw r0,0(r12)
mfspr r0,SRR0
@@ -303,7 +310,9 @@
mtmsr r11
SYNC
- li r12,0xd00-4*3 /* restore regs */
+ li r12,0xd00-4 /* restore regs */
+ lwz r12,0(r12)
+
lwz r11,0(r12)
mtlr r11
lwz r11,4(r12)
@@ -311,8 +320,13 @@
lwz r11,8(r12)
mtspr SRR1,r11
+ addi r12,r12,12 /* Adjust stack pointer */
+ li r20,0xd00-4
+ stw r12,0(r20)
+
SYNC
rfi
+_end_back:
STD_EXCEPTION(EXC_OFF_TRACE, SingleStep, UnknownException)
diff --git a/cpu/mpc8260/start.S b/cpu/mpc8260/start.S
index 10a8988..d79c578 100644
--- a/cpu/mpc8260/start.S
+++ b/cpu/mpc8260/start.S
@@ -324,7 +324,14 @@
add r11,r11,r0
lwz r11,0(r11)
- li r12,0xd00-4*3 /* save LR & SRRx */
+ li r20,0xd00-4 /* Get stack pointer */
+ lwz r12,0(r20)
+ subi r12,r12,12 /* Adjust stack pointer */
+ li r0,0xc00+_end_back-SystemCall
+ cmplw 0, r0, r12 /* Check stack overflow */
+ bgt 1f
+ stw r12,0(r20)
+
mflr r0
stw r0,0(r12)
mfspr r0,SRR0
@@ -349,7 +356,9 @@
mtmsr r11
SYNC
- li r12,0xd00-4*3 /* restore regs */
+ li r12,0xd00-4 /* restore regs */
+ lwz r12,0(r12)
+
lwz r11,0(r12)
mtlr r11
lwz r11,4(r12)
@@ -357,8 +366,13 @@
lwz r11,8(r12)
mtspr SRR1,r11
+ addi r12,r12,12 /* Adjust stack pointer */
+ li r20,0xd00-4
+ stw r12,0(r20)
+
SYNC
rfi
+_end_back:
STD_EXCEPTION(0xd00, SingleStep, UnknownException)
diff --git a/cpu/mpc8xx/interrupts.c b/cpu/mpc8xx/interrupts.c
index 57ff4dd..8664826 100644
--- a/cpu/mpc8xx/interrupts.c
+++ b/cpu/mpc8xx/interrupts.c
@@ -28,99 +28,104 @@
#include <asm/processor.h>
#include <commproc.h>
-/****************************************************************************/
+/************************************************************************/
-unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
+unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
-/****************************************************************************/
+/************************************************************************/
/*
* CPM interrupt vector functions.
*/
-struct cpm_action {
- interrupt_handler_t *handler;
- void *arg;
+struct interrupt_action {
+ interrupt_handler_t *handler;
+ void *arg;
};
-static struct cpm_action cpm_vecs[CPMVEC_NR];
+static struct interrupt_action cpm_vecs[CPMVEC_NR];
+static struct interrupt_action irq_vecs[NR_IRQS];
static void cpm_interrupt_init (void);
-static void cpm_interrupt(int irq, struct pt_regs * regs);
+static void cpm_interrupt (void *regs);
-/****************************************************************************/
+/************************************************************************/
-static __inline__ unsigned long get_msr(void)
+static __inline__ unsigned long get_msr (void)
{
- unsigned long msr;
+ unsigned long msr;
- asm volatile("mfmsr %0" : "=r" (msr) :);
- return msr;
+ asm volatile ("mfmsr %0":"=r" (msr):);
+
+ return msr;
}
-static __inline__ void set_msr(unsigned long msr)
+static __inline__ void set_msr (unsigned long msr)
{
- asm volatile("mtmsr %0" : : "r" (msr));
+ asm volatile ("mtmsr %0"::"r" (msr));
}
-static __inline__ unsigned long get_dec(void)
+static __inline__ unsigned long get_dec (void)
{
- unsigned long val;
+ unsigned long val;
- asm volatile("mfdec %0" : "=r" (val) :);
- return val;
+ asm volatile ("mfdec %0":"=r" (val):);
+
+ return val;
}
-static __inline__ void set_dec(unsigned long val)
+static __inline__ void set_dec (unsigned long val)
{
- asm volatile("mtdec %0" : : "r" (val));
+ asm volatile ("mtdec %0"::"r" (val));
}
void enable_interrupts (void)
{
- set_msr (get_msr() | MSR_EE);
+ set_msr (get_msr () | MSR_EE);
}
/* returns flag if MSR_EE was set before */
int disable_interrupts (void)
{
- ulong msr = get_msr();
+ ulong msr = get_msr ();
+
set_msr (msr & ~MSR_EE);
return ((msr & MSR_EE) != 0);
}
-/****************************************************************************/
+/************************************************************************/
-int interrupt_init(void)
+int interrupt_init (void)
{
- volatile immap_t *immr = (immap_t *)CFG_IMMR;
+ volatile immap_t *immr = (immap_t *) CFG_IMMR;
- decrementer_count = get_tbclk() / CFG_HZ;
+ decrementer_count = get_tbclk () / CFG_HZ;
- cpm_interrupt_init();
+ /* disable all interrupts */
+ immr->im_siu_conf.sc_simask = 0;
- /* disable all interrupts except for the CPM interrupt */
- immr->im_siu_conf.sc_simask = 1 << (31-CPM_INTERRUPT);
+ /* Configure CPM interrupts */
+ cpm_interrupt_init ();
set_dec (decrementer_count);
- set_msr (get_msr() | MSR_EE);
+ set_msr (get_msr () | MSR_EE);
return (0);
}
-/****************************************************************************/
+/************************************************************************/
/*
* Handle external interrupts
*/
-void external_interrupt(struct pt_regs *regs)
+void external_interrupt (struct pt_regs *regs)
{
- volatile immap_t *immr = (immap_t *)CFG_IMMR;
- int irq;
- ulong simask, newmask;
- ulong vec, v_bit;
+ volatile immap_t *immr = (immap_t *) CFG_IMMR;
+ int irq;
+ ulong simask, newmask;
+ ulong vec, v_bit;
/*
* read the SIVEC register and shift the bits down
@@ -137,14 +142,15 @@
newmask = simask & (~(0xFFFF0000 >> irq));
immr->im_siu_conf.sc_simask = newmask;
- if (!(irq & 0x1)) { /* External Interrupt ? */
+ if (!(irq & 0x1)) { /* External Interrupt ? */
ulong siel;
+
/*
* Read Interrupt Edge/Level Register
*/
siel = immr->im_siu_conf.sc_siel;
- if (siel & v_bit) { /* edge triggered interrupt ? */
+ if (siel & v_bit) { /* edge triggered interrupt ? */
/*
* Rewrite SIPEND Register to clear interrupt
*/
@@ -152,34 +158,29 @@
}
}
- switch (irq) {
- case CPM_INTERRUPT:
- cpm_interrupt (irq, regs);
- break;
- default:
+ if (irq_vecs[irq].handler != NULL) {
+ irq_vecs[irq].handler (irq_vecs[irq].arg);
+ } else {
printf ("\nBogus External Interrupt IRQ %d Vector %ld\n",
- irq, vec);
+ irq, vec);
/* turn off the bogus interrupt to avoid it from now */
simask &= ~v_bit;
- break;
}
-
/*
* Re-Enable old Interrupt Mask
*/
immr->im_siu_conf.sc_simask = simask;
}
-/****************************************************************************/
+/************************************************************************/
/*
* CPM interrupt handler
*/
-static void
-cpm_interrupt(int irq, struct pt_regs * regs)
+static void cpm_interrupt (void *regs)
{
- volatile immap_t *immr = (immap_t *)CFG_IMMR;
- uint vec;
+ volatile immap_t *immr = (immap_t *) CFG_IMMR;
+ uint vec;
/*
* Get the vector by setting the ACK bit
@@ -190,13 +191,14 @@
vec >>= 11;
if (cpm_vecs[vec].handler != NULL) {
- (*cpm_vecs[vec].handler)(cpm_vecs[vec].arg);
+ (*cpm_vecs[vec].handler) (cpm_vecs[vec].arg);
} else {
immr->im_cpic.cpic_cimr &= ~(1 << vec);
printf ("Masking bogus CPM interrupt vector 0x%x\n", vec);
}
/*
- * After servicing the interrupt, we have to remove the status indicator.
+ * After servicing the interrupt,
+ * we have to remove the status indicator.
*/
immr->im_cpic.cpic_cisr |= (1 << vec);
}
@@ -207,75 +209,110 @@
* to do is ACK it and return. This is a no-op function so we don't
* need any special tests in the interrupt handler.
*/
-static void
-cpm_error_interrupt (void *dummy)
+static void cpm_error_interrupt (void *dummy)
{
}
-/****************************************************************************/
-
+/************************************************************************/
/*
- * Install and free a CPM interrupt handler.
+ * Install and free an interrupt handler
*/
-
-void
-irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
+void irq_install_handler (int vec, interrupt_handler_t * handler,
+ void *arg)
{
- volatile immap_t *immr = (immap_t *)CFG_IMMR;
+ volatile immap_t *immr = (immap_t *) CFG_IMMR;
- if (cpm_vecs[vec].handler != NULL) {
- printf ("CPM interrupt 0x%x replacing 0x%x\n",
- (uint)handler, (uint)cpm_vecs[vec].handler);
+ if ((vec & CPMVEC_OFFSET) != 0) {
+ /* CPM interrupt */
+ vec &= 0xffff;
+ if (cpm_vecs[vec].handler != NULL) {
+ printf ("CPM interrupt 0x%x replacing 0x%x\n",
+ (uint) handler,
+ (uint) cpm_vecs[vec].handler);
+ }
+ cpm_vecs[vec].handler = handler;
+ cpm_vecs[vec].arg = arg;
+ immr->im_cpic.cpic_cimr |= (1 << vec);
+#if 0
+ printf ("Install CPM interrupt for vector %d ==> %p\n",
+ vec, handler);
+#endif
+ } else {
+ /* SIU interrupt */
+ if (irq_vecs[vec].handler != NULL) {
+ printf ("SIU interrupt %d 0x%x replacing 0x%x\n",
+ vec,
+ (uint) handler,
+ (uint) cpm_vecs[vec].handler);
+ }
+ irq_vecs[vec].handler = handler;
+ irq_vecs[vec].arg = arg;
+ immr->im_siu_conf.sc_simask |= 1 << (31 - vec);
+#if 0
+ printf ("Install SIU interrupt for vector %d ==> %p\n",
+ vec, handler);
+#endif
}
- cpm_vecs[vec].handler = handler;
- cpm_vecs[vec].arg = arg;
- immr->im_cpic.cpic_cimr |= (1 << vec);
-#if 0
- printf ("Install CPM interrupt for vector %d ==> %p\n", vec, handler);
-#endif
}
-void
-irq_free_handler(int vec)
+void irq_free_handler (int vec)
{
- volatile immap_t *immr = (immap_t *)CFG_IMMR;
+ volatile immap_t *immr = (immap_t *) CFG_IMMR;
+
+ if ((vec & CPMVEC_OFFSET) != 0) {
+ /* CPM interrupt */
+ vec &= 0xffff;
#if 0
- printf ("Free CPM interrupt for vector %d ==> %p\n",
- vec, cpm_vecs[vec].handler);
+ printf ("Free CPM interrupt for vector %d ==> %p\n",
+ vec, cpm_vecs[vec].handler);
#endif
- immr->im_cpic.cpic_cimr &= ~(1 << vec);
- cpm_vecs[vec].handler = NULL;
- cpm_vecs[vec].arg = NULL;
+ immr->im_cpic.cpic_cimr &= ~(1 << vec);
+ cpm_vecs[vec].handler = NULL;
+ cpm_vecs[vec].arg = NULL;
+ } else {
+ /* SIU interrupt */
+#if 0
+ printf ("Free CPM interrupt for vector %d ==> %p\n",
+ vec, cpm_vecs[vec].handler);
+#endif
+ immr->im_siu_conf.sc_simask &= ~(1 << (31 - vec));
+ irq_vecs[vec].handler = NULL;
+ irq_vecs[vec].arg = NULL;
+ }
}
-/****************************************************************************/
+/************************************************************************/
-static void
-cpm_interrupt_init (void)
+static void cpm_interrupt_init (void)
{
- volatile immap_t *immr = (immap_t *)CFG_IMMR;
+ volatile immap_t *immr = (immap_t *) CFG_IMMR;
/*
* Initialize the CPM interrupt controller.
*/
immr->im_cpic.cpic_cicr =
- ( CICR_SCD_SCC4 |
- CICR_SCC_SCC3 |
- CICR_SCB_SCC2 |
- CICR_SCA_SCC1 ) | ((CPM_INTERRUPT/2) << 13) | CICR_HP_MASK;
+ (CICR_SCD_SCC4 |
+ CICR_SCC_SCC3 |
+ CICR_SCB_SCC2 |
+ CICR_SCA_SCC1) | ((CPM_INTERRUPT / 2) << 13) | CICR_HP_MASK;
immr->im_cpic.cpic_cimr = 0;
/*
* Install the error handler.
*/
- irq_install_handler(CPMVEC_ERROR, cpm_error_interrupt, NULL);
+ irq_install_handler (CPMVEC_ERROR, cpm_error_interrupt, NULL);
immr->im_cpic.cpic_cicr |= CICR_IEN;
+
+ /*
+ * Install the cpm interrupt handler
+ */
+ irq_install_handler (CPM_INTERRUPT, cpm_interrupt, NULL);
}
-/****************************************************************************/
+/************************************************************************/
volatile ulong timestamp = 0;
@@ -284,18 +321,19 @@
* with interrupts disabled.
* Trivial implementation - no need to be really accurate.
*/
-void timer_interrupt(struct pt_regs *regs)
+void timer_interrupt (struct pt_regs *regs)
{
- volatile immap_t *immr = (immap_t *)CFG_IMMR;
+ volatile immap_t *immr = (immap_t *) CFG_IMMR;
+
#ifdef CONFIG_STATUS_LED
- extern void status_led_tick (ulong);
+ extern void status_led_tick (ulong);
#endif
#if 0
printf ("*** Timer Interrupt *** ");
#endif
/* Reset Timer Expired and Timers Interrupt Status */
immr->im_clkrstk.cark_plprcrk = KAPWR_KEY;
- __asm__("nop");
+ __asm__ ("nop");
immr->im_clkrst.car_plprcr |= PLPRCR_TEXPS | PLPRCR_TMIST;
/* Restore Decrementer Count */
set_dec (decrementer_count);
@@ -304,11 +342,10 @@
#ifdef CONFIG_STATUS_LED
status_led_tick (timestamp);
-#endif /* CONFIG_STATUS_LED */
+#endif /* CONFIG_STATUS_LED */
#if defined(CONFIG_WATCHDOG) || defined(CFG_CMA_LCD_HEARTBEAT)
-
/*
* The shortest watchdog period of all boards (except LWMON)
* is approx. 1 sec, thus re-trigger watchdog at least
@@ -321,20 +358,20 @@
#endif
#if defined(CFG_CMA_LCD_HEARTBEAT)
- extern void lcd_heartbeat(void);
- lcd_heartbeat();
+ extern void lcd_heartbeat (void);
+
+ lcd_heartbeat ();
#endif /* CFG_CMA_LCD_HEARTBEAT */
#if defined(CONFIG_WATCHDOG)
- reset_8xx_watchdog(immr);
+ reset_8xx_watchdog (immr);
#endif /* CONFIG_WATCHDOG */
}
-
#endif /* CONFIG_WATCHDOG || CFG_CMA_LCD_HEARTBEAT */
}
-/****************************************************************************/
+/************************************************************************/
void reset_timer (void)
{
@@ -351,4 +388,4 @@
timestamp = t;
}
-/****************************************************************************/
+/************************************************************************/
diff --git a/cpu/mpc8xx/start.S b/cpu/mpc8xx/start.S
index a430061..a1b7eff 100644
--- a/cpu/mpc8xx/start.S
+++ b/cpu/mpc8xx/start.S
@@ -285,7 +285,14 @@
add r11,r11,r0
lwz r11,0(r11)
- li r12,0xd00-4*3 /* save LR & SRRx */
+ li r20,0xd00-4 /* Get stack pointer */
+ lwz r12,0(r20)
+ subi r12,r12,12 /* Adjust stack pointer */
+ li r0,0xc00+_end_back-SystemCall
+ cmplw 0, r0, r12 /* Check stack overflow */
+ bgt 1f
+ stw r12,0(r20)
+
mflr r0
stw r0,0(r12)
mfspr r0,SRR0
@@ -310,7 +317,9 @@
mtmsr r11
SYNC
- li r12,0xd00-4*3 /* restore regs */
+ li r12,0xd00-4 /* restore regs */
+ lwz r12,0(r12)
+
lwz r11,0(r12)
mtlr r11
lwz r11,4(r12)
@@ -318,8 +327,13 @@
lwz r11,8(r12)
mtspr SRR1,r11
+ addi r12,r12,12 /* Adjust stack pointer */
+ li r20,0xd00-4
+ stw r12,0(r20)
+
SYNC
rfi
+_end_back:
STD_EXCEPTION(0xd00, SingleStep, UnknownException)
diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S
index baaaba4..c40a8db 100644
--- a/cpu/ppc4xx/start.S
+++ b/cpu/ppc4xx/start.S
@@ -775,7 +775,14 @@
add r11,r11,r0
lwz r11,0(r11)
- li r12,0xd00-4*3 /* save LR & SRRx */
+ li r20,0xd00-4 /* Get stack pointer */
+ lwz r12,0(r20)
+ subi r12,r12,12 /* Adjust stack pointer */
+ li r0,0xc00+_end_back-SystemCall
+ cmplw 0, r0, r12 /* Check stack overflow */
+ bgt 1f
+ stw r12,0(r20)
+
mflr r0
stw r0,0(r12)
mfspr r0,SRR0
@@ -800,7 +807,9 @@
mtmsr r11
SYNC
- li r12,0xd00-4*3 /* restore regs */
+ li r12,0xd00-4 /* restore regs */
+ lwz r12,0(r12)
+
lwz r11,0(r12)
mtlr r11
lwz r11,4(r12)
@@ -808,8 +817,13 @@
lwz r11,8(r12)
mtspr SRR1,r11
+ addi r12,r12,12 /* Adjust stack pointer */
+ li r20,0xd00-4
+ stw r12,0(r20)
+
SYNC
rfi
+_end_back:
STD_EXCEPTION(0xd00, SingleStep, UnknownException)