Loading arch/arc/kernel/entry-compact.S +2 −0 Original line number Diff line number Diff line Loading @@ -391,3 +391,5 @@ not_level1_interrupt: EXCEPTION_EPILOGUE debug_marker_syscall: rtie END(ret_from_exception) arch/arc/kernel/entry.S +50 −48 Original line number Diff line number Diff line Loading @@ -24,6 +24,55 @@ *------------------------------------------------------------------ */ ;################### Special Sys Call Wrappers ########################## ENTRY(sys_clone_wrapper) SAVE_CALLEE_SAVED_USER bl @sys_clone DISCARD_CALLEE_SAVED_USER GET_CURR_THR_INFO_FLAGS r10 btst r10, TIF_SYSCALL_TRACE bnz tracesys_exit b ret_from_system_call END(sys_clone_wrapper) ENTRY(ret_from_fork) ; when the forked child comes here from the __switch_to function ; r0 has the last task pointer. ; put last task in scheduler queue bl @schedule_tail ld r9, [sp, PT_status32] brne r9, 0, 1f jl.d [r14] ; kernel thread entry point mov r0, r13 ; (see PF_KTHREAD block in copy_thread) 1: ; Return to user space ; 1. Any forked task (Reach here via BRne above) ; 2. First ever init task (Reach here via return from JL above) ; This is the historic "kernel_execve" use-case, to return to init ; user mode, in a round about way since that is always done from ; a kernel thread which is executed via JL above but always returns ; out whenever kernel_execve (now inline do_fork()) is involved b ret_from_exception END(ret_from_fork) #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 ; Reset to .text as this file is included in entry-<isa>.S .section .text, "ax",@progbits #endif ;################### Non TLB Exception Handling ############################# ; --------------------------------------------- Loading Loading @@ -338,53 +387,6 @@ resume_kernel_mode: #endif b .Lrestore_regs END(ret_from_exception) ENTRY(ret_from_fork) ; when the forked child comes here from the __switch_to function ; r0 has the last task pointer. ; put last task in scheduler queue bl @schedule_tail ld r9, [sp, PT_status32] brne r9, 0, 1f jl.d [r14] ; kernel thread entry point mov r0, r13 ; (see PF_KTHREAD block in copy_thread) 1: ; Return to user space ; 1. Any forked task (Reach here via BRne above) ; 2. First ever init task (Reach here via return from JL above) ; This is the historic "kernel_execve" use-case, to return to init ; user mode, in a round about way since that is always done from ; a kernel thread which is executed via JL above but always returns ; out whenever kernel_execve (now inline do_fork()) is involved b ret_from_exception END(ret_from_fork) ;################### Special Sys Call Wrappers ########################## ENTRY(sys_clone_wrapper) SAVE_CALLEE_SAVED_USER bl @sys_clone DISCARD_CALLEE_SAVED_USER GET_CURR_THR_INFO_FLAGS r10 btst r10, TIF_SYSCALL_TRACE bnz tracesys_exit b ret_from_system_call END(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 ##### DONT ADD CODE HERE - .Lrestore_regs actually follows in entry-<isa>.S ; Reset to .text as this file is included in entry-<isa>.S .section .text, "ax",@progbits #endif Loading
arch/arc/kernel/entry-compact.S +2 −0 Original line number Diff line number Diff line Loading @@ -391,3 +391,5 @@ not_level1_interrupt: EXCEPTION_EPILOGUE debug_marker_syscall: rtie END(ret_from_exception)
arch/arc/kernel/entry.S +50 −48 Original line number Diff line number Diff line Loading @@ -24,6 +24,55 @@ *------------------------------------------------------------------ */ ;################### Special Sys Call Wrappers ########################## ENTRY(sys_clone_wrapper) SAVE_CALLEE_SAVED_USER bl @sys_clone DISCARD_CALLEE_SAVED_USER GET_CURR_THR_INFO_FLAGS r10 btst r10, TIF_SYSCALL_TRACE bnz tracesys_exit b ret_from_system_call END(sys_clone_wrapper) ENTRY(ret_from_fork) ; when the forked child comes here from the __switch_to function ; r0 has the last task pointer. ; put last task in scheduler queue bl @schedule_tail ld r9, [sp, PT_status32] brne r9, 0, 1f jl.d [r14] ; kernel thread entry point mov r0, r13 ; (see PF_KTHREAD block in copy_thread) 1: ; Return to user space ; 1. Any forked task (Reach here via BRne above) ; 2. First ever init task (Reach here via return from JL above) ; This is the historic "kernel_execve" use-case, to return to init ; user mode, in a round about way since that is always done from ; a kernel thread which is executed via JL above but always returns ; out whenever kernel_execve (now inline do_fork()) is involved b ret_from_exception END(ret_from_fork) #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 ; Reset to .text as this file is included in entry-<isa>.S .section .text, "ax",@progbits #endif ;################### Non TLB Exception Handling ############################# ; --------------------------------------------- Loading Loading @@ -338,53 +387,6 @@ resume_kernel_mode: #endif b .Lrestore_regs END(ret_from_exception) ENTRY(ret_from_fork) ; when the forked child comes here from the __switch_to function ; r0 has the last task pointer. ; put last task in scheduler queue bl @schedule_tail ld r9, [sp, PT_status32] brne r9, 0, 1f jl.d [r14] ; kernel thread entry point mov r0, r13 ; (see PF_KTHREAD block in copy_thread) 1: ; Return to user space ; 1. Any forked task (Reach here via BRne above) ; 2. First ever init task (Reach here via return from JL above) ; This is the historic "kernel_execve" use-case, to return to init ; user mode, in a round about way since that is always done from ; a kernel thread which is executed via JL above but always returns ; out whenever kernel_execve (now inline do_fork()) is involved b ret_from_exception END(ret_from_fork) ;################### Special Sys Call Wrappers ########################## ENTRY(sys_clone_wrapper) SAVE_CALLEE_SAVED_USER bl @sys_clone DISCARD_CALLEE_SAVED_USER GET_CURR_THR_INFO_FLAGS r10 btst r10, TIF_SYSCALL_TRACE bnz tracesys_exit b ret_from_system_call END(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 ##### DONT ADD CODE HERE - .Lrestore_regs actually follows in entry-<isa>.S ; Reset to .text as this file is included in entry-<isa>.S .section .text, "ax",@progbits #endif
Vineet Gupta <vgupta@synopsys.com>Vineet Gupta <vgupta@synopsys.com>