* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
+ * vineetg: May 2011
+ * -Userspace unaligned access emulation
+ *
* vineetg: Feb 2011 (ptrace low level code fixes)
* -traced syscall return code (r0) was not saved into pt_regs for restoring
* into user reg-file when traded task rets to user space.
;##################### Scratch Mem for IRQ stack switching #############
- .section .data ; NOT .global
+ARCFP_DATA int1_saved_reg
.align 32
.type int1_saved_reg, @object
.size int1_saved_reg, 4
/* Each Interrupt level needs it's own scratch */
#ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS
- .section .data ; NOT .global
+ARCFP_DATA int2_saved_reg
.type int2_saved_reg, @object
.size int2_saved_reg, 4
int2_saved_reg:
ARC_ENTRY handle_interrupt_level1
/* free up r9 as scratchpad */
+#ifdef CONFIG_SMP
+ sr r9, [ARC_REG_SCRATCH_DATA0]
+#else
st r9, [@int1_saved_reg]
+#endif
;Which mode (user/kernel) was the system in when intr occured
lr r9, [status32_l1]
mov r1, r4 ; faulting address
mov r2, sp ; pt_regs
+#ifdef CONFIG_ARC_MISALIGN_ACCESS
+ SAVE_CALLEE_SAVED_USER
+ mov r3, sp ; callee_regs
+#endif
+
bl do_misaligned_access
+
+#ifdef CONFIG_ARC_MISALIGN_ACCESS
+ DISCARD_CALLEE_SAVED_USER
+#endif
+
b ret_from_exception
ARC_EXIT EV_TLBProtV
; using ERET won't work since next-PC has already committed
lr r12, [efa]
GET_CURR_TASK_FIELD_PTR TASK_THREAD, r11
- st r12, [r11, THREAD_FAULT_ADDR]
+ st r12, [r11, THREAD_FAULT_ADDR] ; thread.fault_address
; PRE Sys Call Ptrace hook
mov r0, sp ; pt_regs needed
trap_with_param:
; stop_pc info by gdb needs this info
- st orig_r8_IS_BRKPT, [sp, PT_orig_r8]
+ stw orig_r8_IS_BRKPT, [sp, PT_orig_r8]
mov r0, r12
lr r1, [efa]
; things to what they were, before returning from L2 context
;----------------------------------------------------------------
- ld r9, [sp, PT_orig_r8] ; get orig_r8 to make sure it is
+ ldw r9, [sp, PT_orig_r8] ; get orig_r8 to make sure it is
brne r9, orig_r8_IS_IRQ2, 149f ; infact a L2 ISR ret path
ld r9, [sp, PT_status32] ; get statu32_l2 (saved in pt_regs)
;################### Special Sys Call Wrappers ##########################
-; TBD: call do_fork directly from here
-ARC_ENTRY sys_fork_wrapper
- SAVE_CALLEE_SAVED_USER
- bl @sys_fork
- DISCARD_CALLEE_SAVED_USER
-
- GET_CURR_THR_INFO_FLAGS r10
- btst r10, TIF_SYSCALL_TRACE
- bnz tracesys_exit
-
- b ret_from_system_call
-ARC_EXIT sys_fork_wrapper
-
-ARC_ENTRY sys_vfork_wrapper
- SAVE_CALLEE_SAVED_USER
- bl @sys_vfork
- DISCARD_CALLEE_SAVED_USER
-
- GET_CURR_THR_INFO_FLAGS r10
- btst r10, TIF_SYSCALL_TRACE
- bnz tracesys_exit
-
- b ret_from_system_call
-ARC_EXIT sys_vfork_wrapper
-
ARC_ENTRY sys_clone_wrapper
SAVE_CALLEE_SAVED_USER
bl @sys_clone
b ret_from_system_call
ARC_EXIT sys_clone_wrapper
+
+#ifdef CONFIG_ARC_DW2_UNWIND
+; Workaround for bug 94179 (STAR ):
+; Despite -fasynchronous-unwind-tables, linker is not making dwarf2 unwinder
+; section (.debug_frame) as loadable. So we force it here.
+; This also fixes STAR 9000487933 where the prev-workaround (objcopy --setflag)
+; would not work after a clean build due to kernel build system dependencies.
+.section .debug_frame, "wa",@progbits
+#endif