diff options
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 278888e89acc..579e0f9a2d57 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -34,6 +34,7 @@ #include <asm/ftrace.h> #include <asm/hw_irq.h> #include <asm/context_tracking.h> +#include <asm/tm.h> /* * System calls. @@ -51,6 +52,12 @@ exception_marker: .globl system_call_common system_call_common: +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +BEGIN_FTR_SECTION + extrdi. r10, r12, 1, (63-MSR_TS_T_LG) /* transaction active? */ + bne tabort_syscall +END_FTR_SECTION_IFSET(CPU_FTR_TM) +#endif andi. r10,r12,MSR_PR mr r10,r1 addi r1,r1,-INT_FRAME_SIZE @@ -311,6 +318,34 @@ syscall_exit_work: bl do_syscall_trace_leave b ret_from_except +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +tabort_syscall: + /* Firstly we need to enable TM in the kernel */ + mfmsr r10 + li r13, 1 + rldimi r10, r13, MSR_TM_LG, 63-MSR_TM_LG + mtmsrd r10, 0 + + /* tabort, this dooms the transaction, nothing else */ + li r13, (TM_CAUSE_SYSCALL|TM_CAUSE_PERSISTENT) + TABORT(R13) + + /* + * Return directly to userspace. We have corrupted user register state, + * but userspace will never see that register state. Execution will + * resume after the tbegin of the aborted transaction with the + * checkpointed register state. + */ + li r13, MSR_RI + andc r10, r10, r13 + mtmsrd r10, 1 + mtspr SPRN_SRR0, r11 + mtspr SPRN_SRR1, r12 + + rfid + b . /* prevent speculative execution */ +#endif + /* Save non-volatile GPRs, if not already saved. */ _GLOBAL(save_nvgprs) ld r11,_TRAP(r1) |