diff options
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64e.S')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64e.S | 50 |
1 files changed, 46 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index 24dcc0ecf24..5c43063d250 100644 --- a/arch/powerpc/kernel/exceptions-64e.S +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -191,6 +191,12 @@ exc_##n##_bad_stack: \ sth r1,PACA_TRAP_SAVE(r13); /* store trap */ \ b bad_stack_book3e; /* bad stack error */ +/* WARNING: If you change the layout of this stub, make sure you chcek + * the debug exception handler which handles single stepping + * into exceptions from userspace, and the MM code in + * arch/powerpc/mm/tlb_nohash.c which patches the branch here + * and would need to be updated if that branch is moved + */ #define EXCEPTION_STUB(loc, label) \ . = interrupt_base_book3e + loc; \ nop; /* To make debug interrupts happy */ \ @@ -204,11 +210,30 @@ exc_##n##_bad_stack: \ lis r,TSR_FIS@h; \ mtspr SPRN_TSR,r +/* Used by asynchronous interrupt that may happen in the idle loop. + * + * This check if the thread was in the idle loop, and if yes, returns + * to the caller rather than the PC. This is to avoid a race if + * interrupts happen before the wait instruction. + */ +#define CHECK_NAPPING() \ + clrrdi r11,r1,THREAD_SHIFT; \ + ld r10,TI_LOCAL_FLAGS(r11); \ + andi. r9,r10,_TLF_NAPPING; \ + beq+ 1f; \ + ld r8,_LINK(r1); \ + rlwinm r7,r10,0,~_TLF_NAPPING; \ + std r8,_NIP(r1); \ + std r7,TI_LOCAL_FLAGS(r11); \ +1: + + #define MASKABLE_EXCEPTION(trapnum, label, hdlr, ack) \ START_EXCEPTION(label); \ NORMAL_EXCEPTION_PROLOG(trapnum, PROLOG_ADDITION_MASKABLE) \ EXCEPTION_COMMON(trapnum, PACA_EXGEN, INTS_DISABLE_ALL) \ ack(r8); \ + CHECK_NAPPING(); \ addi r3,r1,STACK_FRAME_OVERHEAD; \ bl hdlr; \ b .ret_from_except_lite; @@ -246,11 +271,9 @@ interrupt_base_book3e: /* fake trap */ EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */ EXCEPTION_STUB(0x1c0, data_tlb_miss) EXCEPTION_STUB(0x1e0, instruction_tlb_miss) + EXCEPTION_STUB(0x280, doorbell) + EXCEPTION_STUB(0x2a0, doorbell_crit) -#if 0 - EXCEPTION_STUB(0x280, processor_doorbell) - EXCEPTION_STUB(0x220, processor_doorbell_crit) -#endif .globl interrupt_end_book3e interrupt_end_book3e: @@ -259,6 +282,7 @@ interrupt_end_book3e: CRIT_EXCEPTION_PROLOG(0x100, PROLOG_ADDITION_NONE) // EXCEPTION_COMMON(0x100, PACA_EXCRIT, INTS_DISABLE_ALL) // bl special_reg_save_crit +// CHECK_NAPPING(); // addi r3,r1,STACK_FRAME_OVERHEAD // bl .critical_exception // b ret_from_crit_except @@ -270,6 +294,7 @@ interrupt_end_book3e: // EXCEPTION_COMMON(0x200, PACA_EXMC, INTS_DISABLE_ALL) // bl special_reg_save_mc // addi r3,r1,STACK_FRAME_OVERHEAD +// CHECK_NAPPING(); // bl .machine_check_exception // b ret_from_mc_except b . @@ -340,6 +365,7 @@ interrupt_end_book3e: CRIT_EXCEPTION_PROLOG(0x9f0, PROLOG_ADDITION_NONE) // EXCEPTION_COMMON(0x9f0, PACA_EXCRIT, INTS_DISABLE_ALL) // bl special_reg_save_crit +// CHECK_NAPPING(); // addi r3,r1,STACK_FRAME_OVERHEAD // bl .unknown_exception // b ret_from_crit_except @@ -428,6 +454,20 @@ interrupt_end_book3e: kernel_dbg_exc: b . /* NYI */ +/* Doorbell interrupt */ + MASKABLE_EXCEPTION(0x2070, doorbell, .doorbell_exception, ACK_NONE) + +/* Doorbell critical Interrupt */ + START_EXCEPTION(doorbell_crit); + CRIT_EXCEPTION_PROLOG(0x2080, PROLOG_ADDITION_NONE) +// EXCEPTION_COMMON(0x2080, PACA_EXCRIT, INTS_DISABLE_ALL) +// bl special_reg_save_crit +// CHECK_NAPPING(); +// addi r3,r1,STACK_FRAME_OVERHEAD +// bl .doorbell_critical_exception +// b ret_from_crit_except + b . + /* * An interrupt came in while soft-disabled; clear EE in SRR1, @@ -563,6 +603,8 @@ BAD_STACK_TRAMPOLINE(0xd00) BAD_STACK_TRAMPOLINE(0xe00) BAD_STACK_TRAMPOLINE(0xf00) BAD_STACK_TRAMPOLINE(0xf20) +BAD_STACK_TRAMPOLINE(0x2070) +BAD_STACK_TRAMPOLINE(0x2080) .globl bad_stack_book3e bad_stack_book3e: |