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authorMax Filippov <jcmvbkbc@gmail.com>2017-12-15 16:08:16 -0800
committerMax Filippov <jcmvbkbc@gmail.com>2017-12-16 22:37:09 -0800
commitf21a79cab3773bc17aa845b7738c7f200778a260 (patch)
tree810c2feba63b1e3839af00ee2af39d868b0d7cd8 /arch/xtensa
parentc130d3be84afb9b5a30ce4f715f88a1c1dcc4114 (diff)
downloadlinux-f21a79cab3773bc17aa845b7738c7f200778a260.tar.bz2
xtensa: clean up exception handling structure
Instead of using flat array of longs use normal C structure and generate EXC_TABLE_* constants in the asm-offsets.c Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa')
-rw-r--r--arch/xtensa/include/asm/ptrace.h12
-rw-r--r--arch/xtensa/include/asm/regs.h1
-rw-r--r--arch/xtensa/include/asm/traps.h23
-rw-r--r--arch/xtensa/kernel/asm-offsets.c13
-rw-r--r--arch/xtensa/kernel/traps.c39
5 files changed, 56 insertions, 32 deletions
diff --git a/arch/xtensa/include/asm/ptrace.h b/arch/xtensa/include/asm/ptrace.h
index 05beae3c6376..3a5c5918aea3 100644
--- a/arch/xtensa/include/asm/ptrace.h
+++ b/arch/xtensa/include/asm/ptrace.h
@@ -39,18 +39,6 @@
* +-----------------------+ --------
*/
-/* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */
-
-#define EXC_TABLE_KSTK 0x004 /* Kernel Stack */
-#define EXC_TABLE_DOUBLE_SAVE 0x008 /* Double exception save area for a0 */
-#define EXC_TABLE_FIXUP 0x00c /* Fixup handler */
-#define EXC_TABLE_PARAM 0x010 /* For passing a parameter to fixup */
-#define EXC_TABLE_SYSCALL_SAVE 0x014 /* For fast syscall handler */
-#define EXC_TABLE_FAST_USER 0x100 /* Fast user exception handler */
-#define EXC_TABLE_FAST_KERNEL 0x200 /* Fast kernel exception handler */
-#define EXC_TABLE_DEFAULT 0x300 /* Default C-Handler */
-#define EXC_TABLE_SIZE 0x400
-
#ifndef __ASSEMBLY__
#include <asm/coprocessor.h>
diff --git a/arch/xtensa/include/asm/regs.h b/arch/xtensa/include/asm/regs.h
index 881a1134a4b4..477594e5817f 100644
--- a/arch/xtensa/include/asm/regs.h
+++ b/arch/xtensa/include/asm/regs.h
@@ -76,6 +76,7 @@
#define EXCCAUSE_COPROCESSOR5_DISABLED 37
#define EXCCAUSE_COPROCESSOR6_DISABLED 38
#define EXCCAUSE_COPROCESSOR7_DISABLED 39
+#define EXCCAUSE_N 64
/* PS register fields. */
diff --git a/arch/xtensa/include/asm/traps.h b/arch/xtensa/include/asm/traps.h
index 2e69aa4b843f..5bd197097b77 100644
--- a/arch/xtensa/include/asm/traps.h
+++ b/arch/xtensa/include/asm/traps.h
@@ -13,6 +13,29 @@
#include <asm/ptrace.h>
/*
+ * Per-CPU exception handling data structure.
+ * EXCSAVE1 points to it.
+ */
+struct exc_table {
+ /* Kernel Stack */
+ void *kstk;
+ /* Double exception save area for a0 */
+ unsigned long double_save;
+ /* Fixup handler */
+ void *fixup;
+ /* For passing a parameter to fixup */
+ void *fixup_param;
+ /* For fast syscall handler */
+ unsigned long syscall_save;
+ /* Fast user exception handlers */
+ void *fast_user_handler[EXCCAUSE_N];
+ /* Fast kernel exception handlers */
+ void *fast_kernel_handler[EXCCAUSE_N];
+ /* Default C-Handlers */
+ void *default_handler[EXCCAUSE_N];
+};
+
+/*
* handler must be either of the following:
* void (*)(struct pt_regs *regs);
* void (*)(struct pt_regs *regs, unsigned long exccause);
diff --git a/arch/xtensa/kernel/asm-offsets.c b/arch/xtensa/kernel/asm-offsets.c
index 3b119b372efd..022cf918ec20 100644
--- a/arch/xtensa/kernel/asm-offsets.c
+++ b/arch/xtensa/kernel/asm-offsets.c
@@ -132,5 +132,18 @@ int main(void)
offsetof(struct debug_table, icount_level_save));
#endif
+ /* struct exc_table */
+ DEFINE(EXC_TABLE_KSTK, offsetof(struct exc_table, kstk));
+ DEFINE(EXC_TABLE_DOUBLE_SAVE, offsetof(struct exc_table, double_save));
+ DEFINE(EXC_TABLE_FIXUP, offsetof(struct exc_table, fixup));
+ DEFINE(EXC_TABLE_PARAM, offsetof(struct exc_table, fixup_param));
+ DEFINE(EXC_TABLE_SYSCALL_SAVE,
+ offsetof(struct exc_table, syscall_save));
+ DEFINE(EXC_TABLE_FAST_USER,
+ offsetof(struct exc_table, fast_user_handler));
+ DEFINE(EXC_TABLE_FAST_KERNEL,
+ offsetof(struct exc_table, fast_kernel_handler));
+ DEFINE(EXC_TABLE_DEFAULT, offsetof(struct exc_table, default_handler));
+
return 0;
}
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 9a1fef9c1cc6..32c5207f1226 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -159,8 +159,7 @@ COPROCESSOR(7),
* 2. it is a temporary memory buffer for the exception handlers.
*/
-DEFINE_PER_CPU(unsigned long, exc_table[EXC_TABLE_SIZE/4]);
-
+DEFINE_PER_CPU(struct exc_table, exc_table);
DEFINE_PER_CPU(struct debug_table, debug_table);
void die(const char*, struct pt_regs*, long);
@@ -368,28 +367,28 @@ 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;
-}
+#define set_handler(type, cause, handler) \
+ do { \
+ unsigned int cpu; \
+ \
+ for_each_possible_cpu(cpu) \
+ per_cpu(exc_table, cpu).type[cause] = (handler);\
+ } while (0)
/* 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);
+ void *previous = per_cpu(exc_table, 0).default_handler[cause];
+
+ set_handler(default_handler, cause, handler);
return previous;
}
static void trap_init_excsave(void)
{
- unsigned long excsave1 = (unsigned long)this_cpu_ptr(exc_table);
+ unsigned long excsave1 = (unsigned long)this_cpu_ptr(&exc_table);
__asm__ __volatile__("wsr %0, excsave1\n" : : "a" (excsave1));
}
@@ -421,10 +420,10 @@ void __init trap_init(void)
/* Setup default vectors. */
- for(i = 0; i < 64; i++) {
- set_handler(EXC_TABLE_FAST_USER/4 + i, user_exception);
- set_handler(EXC_TABLE_FAST_KERNEL/4 + i, kernel_exception);
- set_handler(EXC_TABLE_DEFAULT/4 + i, do_unhandled);
+ for (i = 0; i < EXCCAUSE_N; i++) {
+ set_handler(fast_user_handler, i, user_exception);
+ set_handler(fast_kernel_handler, i, kernel_exception);
+ set_handler(default_handler, i, do_unhandled);
}
/* Setup specific handlers. */
@@ -436,11 +435,11 @@ void __init trap_init(void)
void *handler = dispatch_init_table[i].handler;
if (fast == 0)
- set_handler (EXC_TABLE_DEFAULT/4 + cause, handler);
+ set_handler(default_handler, cause, handler);
if (fast && fast & USER)
- set_handler (EXC_TABLE_FAST_USER/4 + cause, handler);
+ set_handler(fast_user_handler, cause, handler);
if (fast && fast & KRNL)
- set_handler (EXC_TABLE_FAST_KERNEL/4 + cause, handler);
+ set_handler(fast_kernel_handler, cause, handler);
}
/* Initialize EXCSAVE_1 to hold the address of the exception table. */