|
|
@@ -322,13 +322,8 @@ ENTRY(EV_TLBProtV)
|
|
|
|
|
|
EXCEPTION_PROLOGUE
|
|
|
|
|
|
- ;---------(3) Save some more regs-----------------
|
|
|
- ; vineetg: Mar 6th: Random Seg Fault issue #1
|
|
|
- ; ecr and efa were not saved in case an Intr sneaks in
|
|
|
- ; after fake rtie
|
|
|
-
|
|
|
lr r2, [ecr]
|
|
|
- lr r0, [efa] ; Faulting Data address
|
|
|
+ lr r0, [efa] ; Faulting Data addr (not part of pt_regs saved above)
|
|
|
|
|
|
; Exception auto-disables further Intr/exceptions.
|
|
|
; Re-enable them by pretending to return from exception
|
|
|
@@ -336,7 +331,7 @@ ENTRY(EV_TLBProtV)
|
|
|
|
|
|
FAKE_RET_FROM_EXCPN
|
|
|
|
|
|
- mov r1, sp
|
|
|
+ mov r1, sp ; Handle to pt_regs
|
|
|
|
|
|
;------ (5) Type of Protection Violation? ----------
|
|
|
;
|
|
|
@@ -415,8 +410,11 @@ ENTRY(EV_Extension)
|
|
|
b ret_from_exception
|
|
|
END(EV_Extension)
|
|
|
|
|
|
-;######################### System Call Tracing #########################
|
|
|
+;################ Trap Handling (Syscall, Breakpoint) ##################
|
|
|
|
|
|
+; ---------------------------------------------
|
|
|
+; syscall Tracing
|
|
|
+; ---------------------------------------------
|
|
|
tracesys:
|
|
|
; save EFA in case tracer wants the PC of traced task
|
|
|
; using ERET won't work since next-PC has already committed
|
|
|
@@ -459,10 +457,9 @@ tracesys_exit:
|
|
|
b ret_from_exception ; NOT ret_from_system_call at is saves r0 which
|
|
|
; we'd done before calling post hook above
|
|
|
|
|
|
-;################### Break Point TRAP ##########################
|
|
|
-
|
|
|
- ; ======= (5b) Trap is due to Break-Point =========
|
|
|
-
|
|
|
+; ---------------------------------------------
|
|
|
+; Breakpoint TRAP
|
|
|
+; ---------------------------------------------
|
|
|
trap_with_param:
|
|
|
|
|
|
; stop_pc info by gdb needs this info
|
|
|
@@ -490,36 +487,33 @@ trap_with_param:
|
|
|
|
|
|
b ret_from_exception
|
|
|
|
|
|
-;##################### Trap Handling ##############################
|
|
|
-;
|
|
|
-; EV_Trap caused by TRAP_S and TRAP0 instructions.
|
|
|
-;------------------------------------------------------------------
|
|
|
-; (1) System Calls
|
|
|
-; :parameters in r0-r7.
|
|
|
-; :r8 has the system call number
|
|
|
-; (2) Break Points
|
|
|
-;------------------------------------------------------------------
|
|
|
+; ---------------------------------------------
|
|
|
+; syscall TRAP
|
|
|
+; ABI: (r0-r7) upto 8 args, (r8) syscall number
|
|
|
+; ---------------------------------------------
|
|
|
|
|
|
ENTRY(EV_Trap)
|
|
|
|
|
|
EXCEPTION_PROLOGUE
|
|
|
|
|
|
- ;------- (4) What caused the Trap --------------
|
|
|
+ ;============ TRAP 1 :breakpoints
|
|
|
lr r10, [ecr]
|
|
|
bmsk.f 0, r10, 7
|
|
|
bnz trap_with_param
|
|
|
|
|
|
- ; ======= (5a) Trap is due to System Call ========
|
|
|
+ ;============ TRAP (no param): syscall top level
|
|
|
|
|
|
+ ; First return from Exception to pure K mode (Exception/IRQs renabled)
|
|
|
FAKE_RET_FROM_EXCPN
|
|
|
|
|
|
- ; If syscall tracing ongoing, invoke pre-pos-hooks
|
|
|
+ ; If syscall tracing ongoing, invoke pre-post-hooks
|
|
|
GET_CURR_THR_INFO_FLAGS r10
|
|
|
btst r10, TIF_SYSCALL_TRACE
|
|
|
bnz tracesys ; this never comes back
|
|
|
|
|
|
- ;============ This is normal System Call case ==========
|
|
|
- ; Sys-call num shd not exceed the total system calls avail
|
|
|
+ ;============ Normal syscall case
|
|
|
+
|
|
|
+ ; syscall num shd not exceed the total system calls avail
|
|
|
cmp r8, NR_syscalls
|
|
|
mov.hi r0, -ENOSYS
|
|
|
bhi ret_from_system_call
|
Vineet Gupta