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ARC: entry.S: FAKE_RET_FROM_EXCPN can always use r9

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Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2015-02-27 16:43:08 +05:30
parent a615b47dbf
commit 9b8c7d1e71
2 changed files with 18 additions and 20 deletions
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14
arch/arc/include/asm/entry.h
View file

@ -331,14 +331,14 @@
* Look at EV_ProtV to see how this is actually used
*-------------------------------------------------------------*/
.macro FAKE_RET_FROM_EXCPN reg
.macro FAKE_RET_FROM_EXCPN
ld \reg, [sp, PT_status32]
bic \reg, \reg, (STATUS_U_MASK|STATUS_DE_MASK)
bset \reg, \reg, STATUS_L_BIT
sr \reg, [erstatus]
mov \reg, 55f
sr \reg, [eret]
ld r9, [sp, PT_status32]
bic r9, r9, (STATUS_U_MASK|STATUS_DE_MASK)
bset r9, r9, STATUS_L_BIT
sr r9, [erstatus]
mov r9, 55f
sr r9, [eret]
rtie
55:

24
arch/arc/kernel/entry.S
View file

@ -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