diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2015-02-27 16:43:08 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-06-19 18:09:36 +0530 |
| commit | 9b8c7d1e7107c30a50aae27c1f33fe706c8c6c67 (patch) | |
| tree | 0aaeedb640af23db6492df1d2845e6529522548c /arch/arc/kernel | |
| parent | a615b47dbf0d2cd8ba9ff922addef4e189c627bb (diff) | |
ARC: entry.S: FAKE_RET_FROM_EXCPN can always use r9
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/kernel')
| -rw-r--r-- | arch/arc/kernel/entry.S | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S index 6cced37e7a76..0a75f81e2853 100644 --- a/arch/arc/kernel/entry.S +++ b/arch/arc/kernel/entry.S @@ -261,7 +261,7 @@ ENTRY(instr_service) lr r0, [efa] mov r1, sp - FAKE_RET_FROM_EXCPN r9 + FAKE_RET_FROM_EXCPN bl do_insterror_or_kprobe b ret_from_exception @@ -278,7 +278,7 @@ ENTRY(mem_service) lr r0, [efa] mov r1, sp - FAKE_RET_FROM_EXCPN r9 + FAKE_RET_FROM_EXCPN bl do_memory_error b ret_from_exception @@ -330,12 +330,11 @@ ENTRY(EV_TLBProtV) lr r2, [ecr] lr r0, [efa] ; Faulting Data address - ; --------(4) Return from CPU Exception Mode --------- - ; Fake a rtie, but rtie to next label - ; That way, subsequently, do_page_fault ( ) executes in pure kernel - ; mode with further Exceptions enabled + ; Exception auto-disables further Intr/exceptions. + ; Re-enable them by pretending to return from exception + ; (so rest of handler executes in pure K mode) - FAKE_RET_FROM_EXCPN r9 + FAKE_RET_FROM_EXCPN mov r1, sp @@ -377,7 +376,7 @@ ENTRY(call_do_page_fault) EXCEPTION_PROLOGUE lr r0, [efa] ; Faulting Data address mov r1, sp - FAKE_RET_FROM_EXCPN r9 + FAKE_RET_FROM_EXCPN mov blink, ret_from_exception b do_page_fault @@ -394,7 +393,7 @@ ENTRY(EV_PrivilegeV) lr r0, [efa] mov r1, sp - FAKE_RET_FROM_EXCPN r9 + FAKE_RET_FROM_EXCPN bl do_privilege_fault b ret_from_exception @@ -410,7 +409,7 @@ ENTRY(EV_Extension) lr r0, [efa] mov r1, sp - FAKE_RET_FROM_EXCPN r9 + FAKE_RET_FROM_EXCPN bl do_extension_fault b ret_from_exception @@ -472,7 +471,7 @@ trap_with_param: ; Now that we have read EFA, it is safe to do "fake" rtie ; and get out of CPU exception mode - FAKE_RET_FROM_EXCPN r11 + FAKE_RET_FROM_EXCPN ; Save callee regs in case gdb wants to have a look ; SP will grow up by size of CALLEE Reg-File @@ -512,8 +511,7 @@ ENTRY(EV_Trap) ; ======= (5a) Trap is due to System Call ======== - ; Before doing anything, return from CPU Exception Mode - FAKE_RET_FROM_EXCPN r11 + FAKE_RET_FROM_EXCPN ; If syscall tracing ongoing, invoke pre-pos-hooks GET_CURR_THR_INFO_FLAGS r10 |