diff options
Diffstat (limited to 'arch/hexagon/kernel/vm_entry.S')
| -rw-r--r-- | arch/hexagon/kernel/vm_entry.S | 87 |
1 files changed, 35 insertions, 52 deletions
diff --git a/arch/hexagon/kernel/vm_entry.S b/arch/hexagon/kernel/vm_entry.S index ffe4a424b706..053551ee7114 100644 --- a/arch/hexagon/kernel/vm_entry.S +++ b/arch/hexagon/kernel/vm_entry.S @@ -274,6 +274,9 @@ event_dispatch: callr r1 /* + * Coming back from the C-world, our thread info pointer + * should be in the designated register (usually R19) + * * If we were in kernel mode, we don't need to check scheduler * or signals if CONFIG_PREEMPT is not set. If set, then it has * to jump to a need_resched kind of block. @@ -286,67 +289,43 @@ event_dispatch: #endif /* "Nested control path" -- if the previous mode was kernel */ - R0 = memw(R29 + #_PT_ER_VMEST); { - P0 = tstbit(R0, #HVM_VMEST_UM_SFT); - if (!P0.new) jump:nt restore_all; + R0 = memw(R29 + #_PT_ER_VMEST); + R16.L = #LO(do_work_pending); } - /* - * Returning from system call, normally coming back from user mode - */ -return_from_syscall: - /* Disable interrupts while checking TIF */ - R0 = #VM_INT_DISABLE - trap1(#HVM_TRAP1_VMSETIE) - - /* - * Coming back from the C-world, our thread info pointer - * should be in the designated register (usually R19) - */ -#if CONFIG_HEXAGON_ARCH_VERSION < 4 - R1.L = #LO(_TIF_ALLWORK_MASK) { - R1.H = #HI(_TIF_ALLWORK_MASK); - R0 = memw(THREADINFO_REG + #_THREAD_INFO_FLAGS); - } -#else - { - R1 = ##_TIF_ALLWORK_MASK; - R0 = memw(THREADINFO_REG + #_THREAD_INFO_FLAGS); + P0 = tstbit(R0, #HVM_VMEST_UM_SFT); + if (!P0.new) jump:nt restore_all; + R16.H = #HI(do_work_pending); + R0 = #VM_INT_DISABLE; } -#endif /* - * Compare against the "return to userspace" _TIF_WORK_MASK + * Check also the return from fork/system call, normally coming back from + * user mode + * + * R16 needs to have do_work_pending, and R0 should have VM_INT_DISABLE */ - R1 = and(R1,R0); - { P0 = cmp.eq(R1,#0); if (!P0.new) jump:t work_pending;} - jump restore_all; /* we're outta here! */ -work_pending: +check_work_pending: + /* Disable interrupts while checking TIF */ + trap1(#HVM_TRAP1_VMSETIE) { - P0 = tstbit(R1, #TIF_NEED_RESCHED); - if (!P0.new) jump:nt work_notifysig; + R0 = R29; /* regs should still be at top of stack */ + R1 = memw(THREADINFO_REG + #_THREAD_INFO_FLAGS); + callr R16; } - call schedule - jump return_from_syscall; /* check for more work */ -work_notifysig: - /* this is the part that's kind of fuzzy. */ - R1 = and(R0, #(_TIF_SIGPENDING | _TIF_NOTIFY_RESUME)); - { - P0 = cmp.eq(R1, #0); - if P0.new jump:t restore_all; - } { - R1 = R0; /* unsigned long thread_info_flags */ - R0 = R29; /* regs should still be at top of stack */ + P0 = cmp.eq(R0, #0); if (!P0.new) jump:nt check_work_pending; + R0 = #VM_INT_DISABLE; } - call do_notify_resume restore_all: - /* Disable interrupts, if they weren't already, before reg restore. */ - R0 = #VM_INT_DISABLE + /* + * Disable interrupts, if they weren't already, before reg restore. + * R0 gets preloaded with #VM_INT_DISABLE before we get here. + */ trap1(#HVM_TRAP1_VMSETIE) /* do the setregs here for VM 0.5 */ @@ -371,6 +350,7 @@ restore_all: trap1(#HVM_TRAP1_VMRTE) /* Notreached */ + .globl _K_enter_genex _K_enter_genex: vm_event_entry(do_genex) @@ -390,9 +370,12 @@ _K_enter_machcheck: .globl ret_from_fork ret_from_fork: - call schedule_tail - P0 = cmp.eq(R24, #0); - if P0 jump return_from_syscall - R0 = R25; - callr R24 - jump return_from_syscall + { + call schedule_tail; + R16.H = #HI(do_work_pending); + } + { + R16.L = #LO(do_work_pending); + R0 = #VM_INT_DISABLE; + jump check_work_pending; + } |