Blackfin arch: add an exception request/free api
add an exception request/free api similar to the interrupt request/fre
api so people can utilize the free software based exceptions for their
own purposes
Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index 2188f81..3feca056 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -143,7 +143,7 @@
cc = r6 == r7;
if !cc jump _ex_trap_c;
-_return_from_exception:
+ENTRY(_return_from_exception)
DEBUG_START_HWTRACE(p5, r7)
#if ANOMALY_05000257
R7=LC0;
@@ -171,6 +171,9 @@
[--sp] = ASTAT;
[--sp] = (R7:6, P5:4);
+ENTRY(_ex_replaceable)
+ nop;
+
ENTRY(_ex_trap_c)
/* Call C code (trap_c) to handle the exception, which most
* likely involves sending a signal to the current process.
@@ -298,8 +301,8 @@
r6.l = lo(SEQSTAT_EXCAUSE);
r6.h = hi(SEQSTAT_EXCAUSE);
r7 = r7 & r6;
- p5.h = _extable;
- p5.l = _extable;
+ p5.h = _ex_table;
+ p5.l = _ex_table;
p4 = r7;
p5 = p5 + (p4 << 2);
p4 = [p5];
@@ -818,28 +821,27 @@
#else
.data
#endif
-ALIGN
-_extable:
+ENTRY(_ex_table)
/* entry for each EXCAUSE[5:0]
* This table must be in sync with the table in ./kernel/traps.c
* EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
*/
- .long _ex_syscall; /* 0x00 - User Defined - Linux Syscall */
+ .long _ex_syscall /* 0x00 - User Defined - Linux Syscall */
.long _ex_soft_bp /* 0x01 - User Defined - Software breakpoint */
- .long _ex_trap_c /* 0x02 - User Defined */
+ .long _ex_replaceable /* 0x02 - User Defined */
.long _ex_trap_c /* 0x03 - User Defined - userspace stack overflow */
- .long _ex_trap_c /* 0x04 - User Defined */
- .long _ex_trap_c /* 0x05 - User Defined */
- .long _ex_trap_c /* 0x06 - User Defined */
- .long _ex_trap_c /* 0x07 - User Defined */
- .long _ex_trap_c /* 0x08 - User Defined */
- .long _ex_trap_c /* 0x09 - User Defined */
- .long _ex_trap_c /* 0x0A - User Defined */
- .long _ex_trap_c /* 0x0B - User Defined */
- .long _ex_trap_c /* 0x0C - User Defined */
- .long _ex_trap_c /* 0x0D - User Defined */
- .long _ex_trap_c /* 0x0E - User Defined */
- .long _ex_trap_c /* 0x0F - User Defined */
+ .long _ex_replaceable /* 0x04 - User Defined */
+ .long _ex_replaceable /* 0x05 - User Defined */
+ .long _ex_replaceable /* 0x06 - User Defined */
+ .long _ex_replaceable /* 0x07 - User Defined */
+ .long _ex_replaceable /* 0x08 - User Defined */
+ .long _ex_replaceable /* 0x09 - User Defined */
+ .long _ex_replaceable /* 0x0A - User Defined */
+ .long _ex_replaceable /* 0x0B - User Defined */
+ .long _ex_replaceable /* 0x0C - User Defined */
+ .long _ex_replaceable /* 0x0D - User Defined */
+ .long _ex_replaceable /* 0x0E - User Defined */
+ .long _ex_replaceable /* 0x0F - User Defined */
.long _ex_single_step /* 0x10 - HW Single step */
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
.long _ex_trace_buff_full /* 0x11 - Trace Buffer Full */
@@ -893,8 +895,8 @@
.long _ex_trap_c /* 0x3D - Reserved */
.long _ex_trap_c /* 0x3E - Reserved */
.long _ex_trap_c /* 0x3F - Reserved */
+END(_ex_table)
-ALIGN
ENTRY(_sys_call_table)
.long _sys_restart_syscall /* 0 */
.long _sys_exit