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Diffstat (limited to 'arch/xtensa/kernel/traps.c')
-rw-r--r--arch/xtensa/kernel/traps.c167
1 files changed, 96 insertions, 71 deletions
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index c7a021d9f69..eebbfd8c26f 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -11,7 +11,7 @@
*
* Essentially rewritten for the Xtensa architecture port.
*
- * Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2001 - 2013 Tensilica Inc.
*
* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
* Chris Zankel <chris@zankel.net>
@@ -30,12 +30,15 @@
#include <linux/stringify.h>
#include <linux/kallsyms.h>
#include <linux/delay.h>
+#include <linux/hardirq.h>
+#include <asm/stacktrace.h>
#include <asm/ptrace.h>
#include <asm/timex.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
+#include <asm/traps.h>
#ifdef CONFIG_KGDB
extern int gdb_enter;
@@ -96,13 +99,14 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = {
/* EXCCAUSE_INTEGER_DIVIDE_BY_ZERO unhandled */
/* EXCCAUSE_PRIVILEGED unhandled */
#if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
-#ifdef CONFIG_UNALIGNED_USER
+#ifdef CONFIG_XTENSA_UNALIGNED_USER
{ EXCCAUSE_UNALIGNED, USER, fast_unaligned },
#else
{ EXCCAUSE_UNALIGNED, 0, do_unaligned_user },
#endif
{ EXCCAUSE_UNALIGNED, KRNL, fast_unaligned },
#endif
+#ifdef CONFIG_MMU
{ EXCCAUSE_ITLB_MISS, 0, do_page_fault },
{ EXCCAUSE_ITLB_MISS, USER|KRNL, fast_second_level_miss},
{ EXCCAUSE_ITLB_MULTIHIT, 0, do_multihit },
@@ -117,6 +121,7 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = {
{ EXCCAUSE_STORE_CACHE_ATTRIBUTE, USER|KRNL, fast_store_prohibited },
{ EXCCAUSE_STORE_CACHE_ATTRIBUTE, 0, do_page_fault },
{ EXCCAUSE_LOAD_CACHE_ATTRIBUTE, 0, do_page_fault },
+#endif /* CONFIG_MMU */
/* XCCHAL_EXCCAUSE_FLOATING_POINT unhandled */
#if XTENSA_HAVE_COPROCESSOR(0)
COPROCESSOR(0),
@@ -152,7 +157,7 @@ COPROCESSOR(7),
* 2. it is a temporary memory buffer for the exception handlers.
*/
-unsigned long exc_table[EXC_TABLE_SIZE/4];
+DEFINE_PER_CPU(unsigned long, exc_table[EXC_TABLE_SIZE/4]);
void die(const char*, struct pt_regs*, long);
@@ -190,30 +195,48 @@ void do_multihit(struct pt_regs *regs, unsigned long exccause)
}
/*
- * Level-1 interrupt.
- * We currently have no priority encoding.
+ * IRQ handler.
*/
-unsigned long ignored_level1_interrupts;
extern void do_IRQ(int, struct pt_regs *);
-void do_interrupt (struct pt_regs *regs)
+void do_interrupt(struct pt_regs *regs)
{
- unsigned long intread = get_sr (INTREAD);
- unsigned long intenable = get_sr (INTENABLE);
- int i, mask;
+ static const unsigned int_level_mask[] = {
+ 0,
+ XCHAL_INTLEVEL1_MASK,
+ XCHAL_INTLEVEL2_MASK,
+ XCHAL_INTLEVEL3_MASK,
+ XCHAL_INTLEVEL4_MASK,
+ XCHAL_INTLEVEL5_MASK,
+ XCHAL_INTLEVEL6_MASK,
+ XCHAL_INTLEVEL7_MASK,
+ };
+ struct pt_regs *old_regs = set_irq_regs(regs);
+
+ irq_enter();
+
+ for (;;) {
+ unsigned intread = get_sr(interrupt);
+ unsigned intenable = get_sr(intenable);
+ unsigned int_at_level = intread & intenable;
+ unsigned level;
+
+ for (level = LOCKLEVEL; level > 0; --level) {
+ if (int_at_level & int_level_mask[level]) {
+ int_at_level &= int_level_mask[level];
+ break;
+ }
+ }
- /* Handle all interrupts (no priorities).
- * (Clear the interrupt before processing, in case it's
- * edge-triggered or software-generated)
- */
+ if (level == 0)
+ break;
- for (i=0, mask = 1; i < XCHAL_NUM_INTERRUPTS; i++, mask <<= 1) {
- if (mask & (intread & intenable)) {
- set_sr (mask, INTCLEAR);
- do_IRQ (i,regs);
- }
+ do_IRQ(__ffs(int_at_level), regs);
}
+
+ irq_exit();
+ set_irq_regs(old_regs);
}
/*
@@ -241,7 +264,7 @@ do_illegal_instruction(struct pt_regs *regs)
*/
#if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
-#ifndef CONFIG_UNALIGNED_USER
+#ifndef CONFIG_XTENSA_UNALIGNED_USER
void
do_unaligned_user (struct pt_regs *regs)
{
@@ -290,6 +313,31 @@ do_debug(struct pt_regs *regs)
}
+static void set_handler(int idx, void *handler)
+{
+ unsigned int cpu;
+
+ for_each_possible_cpu(cpu)
+ per_cpu(exc_table, cpu)[idx] = (unsigned long)handler;
+}
+
+/* Set exception C handler - for temporary use when probing exceptions */
+
+void * __init trap_set_handler(int cause, void *handler)
+{
+ void *previous = (void *)per_cpu(exc_table, 0)[
+ EXC_TABLE_DEFAULT / 4 + cause];
+ set_handler(EXC_TABLE_DEFAULT / 4 + cause, handler);
+ return previous;
+}
+
+
+static void trap_init_excsave(void)
+{
+ unsigned long excsave1 = (unsigned long)this_cpu_ptr(exc_table);
+ __asm__ __volatile__("wsr %0, excsave1\n" : : "a" (excsave1));
+}
+
/*
* Initialize dispatch tables.
*
@@ -303,8 +351,6 @@ do_debug(struct pt_regs *regs)
* See vectors.S for more details.
*/
-#define set_handler(idx,handler) (exc_table[idx] = (unsigned long) (handler))
-
void __init trap_init(void)
{
int i;
@@ -334,10 +380,15 @@ void __init trap_init(void)
}
/* Initialize EXCSAVE_1 to hold the address of the exception table. */
+ trap_init_excsave();
+}
- i = (unsigned long)exc_table;
- __asm__ __volatile__("wsr %0, "__stringify(EXCSAVE_1)"\n" : : "a" (i));
+#ifdef CONFIG_SMP
+void secondary_trap_init(void)
+{
+ trap_init_excsave();
}
+#endif
/*
* This function dumps the current valid window frame and other base registers.
@@ -347,14 +398,16 @@ void show_regs(struct pt_regs * regs)
{
int i, wmask;
+ show_regs_print_info(KERN_DEFAULT);
+
wmask = regs->wmask & ~1;
for (i = 0; i < 16; i++) {
if ((i % 8) == 0)
- printk ("\n" KERN_INFO "a%02d: ", i);
- printk("%08lx ", regs->areg[i]);
+ printk(KERN_INFO "a%02d:", i);
+ printk(KERN_CONT " %08lx", regs->areg[i]);
}
- printk("\n");
+ printk(KERN_CONT "\n");
printk("pc: %08lx, ps: %08lx, depc: %08lx, excvaddr: %08lx\n",
regs->pc, regs->ps, regs->depc, regs->excvaddr);
@@ -366,42 +419,25 @@ void show_regs(struct pt_regs * regs)
regs->syscall);
}
-void show_trace(struct task_struct *task, unsigned long *sp)
+static int show_trace_cb(struct stackframe *frame, void *data)
{
- unsigned long a0, a1, pc;
- unsigned long sp_start, sp_end;
-
- a1 = (unsigned long)sp;
-
- if (a1 == 0)
- __asm__ __volatile__ ("mov %0, a1\n" : "=a"(a1));
-
+ if (kernel_text_address(frame->pc)) {
+ printk(" [<%08lx>] ", frame->pc);
+ print_symbol("%s\n", frame->pc);
+ }
+ return 0;
+}
- sp_start = a1 & ~(THREAD_SIZE-1);
- sp_end = sp_start + THREAD_SIZE;
+void show_trace(struct task_struct *task, unsigned long *sp)
+{
+ if (!sp)
+ sp = stack_pointer(task);
printk("Call Trace:");
#ifdef CONFIG_KALLSYMS
printk("\n");
#endif
- spill_registers();
-
- while (a1 > sp_start && a1 < sp_end) {
- sp = (unsigned long*)a1;
-
- a0 = *(sp - 4);
- a1 = *(sp - 3);
-
- if (a1 <= (unsigned long) sp)
- break;
-
- pc = MAKE_PC_FROM_RA(a0, a1);
-
- if (kernel_text_address(pc)) {
- printk(" [<%08lx>] ", pc);
- print_symbol("%s\n", pc);
- }
- }
+ walk_stackframe(sp, show_trace_cb, NULL);
printk("\n");
}
@@ -417,10 +453,9 @@ void show_stack(struct task_struct *task, unsigned long *sp)
int i = 0;
unsigned long *stack;
- if (sp == 0)
- __asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
-
- stack = sp;
+ if (!sp)
+ sp = stack_pointer(task);
+ stack = sp;
printk("\nStack: ");
@@ -435,14 +470,6 @@ void show_stack(struct task_struct *task, unsigned long *sp)
show_trace(task, stack);
}
-void dump_stack(void)
-{
- show_stack(current, NULL);
-}
-
-EXPORT_SYMBOL(dump_stack);
-
-
void show_code(unsigned int *pc)
{
long i;
@@ -480,7 +507,7 @@ void die(const char * str, struct pt_regs * regs, long err)
if (!user_mode(regs))
show_stack(NULL, (unsigned long*)regs->areg[1]);
- add_taint(TAINT_DIE);
+ add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
spin_unlock_irq(&die_lock);
if (in_interrupt())
@@ -491,5 +518,3 @@ void die(const char * str, struct pt_regs * regs, long err)
do_exit(err);
}
-
-
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 05:10:55 +0000