diff options
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 214 |
1 files changed, 115 insertions, 99 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index bce33a38399fb..0bff31f166dd9 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -113,9 +113,7 @@ system_call_common: addi r9,r1,STACK_FRAME_OVERHEAD #endif clrrdi r11,r1,THREAD_SHIFT - li r12,0 ld r10,TI_FLAGS(r11) - stb r12,TI_SC_NOERR(r11) andi. r11,r10,_TIF_SYSCALL_T_OR_A bne- syscall_dotrace syscall_dotrace_cont: @@ -144,24 +142,12 @@ system_call: /* label this so stack traces look sane */ bctrl /* Call handler */ syscall_exit: + std r3,RESULT(r1) #ifdef SHOW_SYSCALLS - std r3,GPR3(r1) bl .do_show_syscall_exit - ld r3,GPR3(r1) + ld r3,RESULT(r1) #endif - std r3,RESULT(r1) - ld r5,_CCR(r1) - li r10,-_LAST_ERRNO - cmpld r3,r10 clrrdi r12,r1,THREAD_SHIFT - bge- syscall_error -syscall_error_cont: - - /* check for syscall tracing or audit */ - ld r9,TI_FLAGS(r12) - andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP) - bne- syscall_exit_trace -syscall_exit_trace_cont: /* disable interrupts so current_thread_info()->flags can't change, and so that we don't get interrupted after loading SRR0/1. */ @@ -173,8 +159,13 @@ syscall_exit_trace_cont: rotldi r10,r10,16 mtmsrd r10,1 ld r9,TI_FLAGS(r12) - andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SIGPENDING|_TIF_NEED_RESCHED) + li r11,-_LAST_ERRNO + andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL|_TIF_SAVE_NVGPRS|_TIF_NOERROR) bne- syscall_exit_work + cmpld r3,r11 + ld r5,_CCR(r1) + bge- syscall_error +syscall_error_cont: ld r7,_NIP(r1) stdcx. r0,0,r1 /* to clear the reservation */ andi. r6,r8,MSR_PR @@ -193,21 +184,12 @@ syscall_exit_trace_cont: rfid b . /* prevent speculative execution */ -syscall_enosys: - li r3,-ENOSYS - std r3,RESULT(r1) - clrrdi r12,r1,THREAD_SHIFT - ld r5,_CCR(r1) - -syscall_error: - lbz r11,TI_SC_NOERR(r12) - cmpwi 0,r11,0 - bne- syscall_error_cont - neg r3,r3 +syscall_error: oris r5,r5,0x1000 /* Set SO bit in CR */ + neg r3,r3 std r5,_CCR(r1) b syscall_error_cont - + /* Traced system call support */ syscall_dotrace: bl .save_nvgprs @@ -225,21 +207,69 @@ syscall_dotrace: ld r10,TI_FLAGS(r10) b syscall_dotrace_cont -syscall_exit_trace: - std r3,GPR3(r1) - bl .save_nvgprs +syscall_enosys: + li r3,-ENOSYS + b syscall_exit + +syscall_exit_work: + /* If TIF_RESTOREALL is set, don't scribble on either r3 or ccr. + If TIF_NOERROR is set, just save r3 as it is. */ + + andi. r0,r9,_TIF_RESTOREALL + bne- 2f + cmpld r3,r11 /* r10 is -LAST_ERRNO */ + blt+ 1f + andi. r0,r9,_TIF_NOERROR + bne- 1f + ld r5,_CCR(r1) + neg r3,r3 + oris r5,r5,0x1000 /* Set SO bit in CR */ + std r5,_CCR(r1) +1: std r3,GPR3(r1) +2: andi. r0,r9,(_TIF_PERSYSCALL_MASK) + beq 4f + + /* Clear per-syscall TIF flags if any are set, but _leave_ + _TIF_SAVE_NVGPRS set in r9 since we haven't dealt with that + yet. */ + + li r11,_TIF_PERSYSCALL_MASK + addi r12,r12,TI_FLAGS +3: ldarx r10,0,r12 + andc r10,r10,r11 + stdcx. r10,0,r12 + bne- 3b + subi r12,r12,TI_FLAGS + +4: bl save_nvgprs + /* Anything else left to do? */ + andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_SAVE_NVGPRS) + beq .ret_from_except_lite + + /* Re-enable interrupts */ + mfmsr r10 + ori r10,r10,MSR_EE + mtmsrd r10,1 + + andi. r0,r9,_TIF_SAVE_NVGPRS + bne save_user_nvgprs + + /* If tracing, re-enable interrupts and do it */ +save_user_nvgprs_cont: + andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP) + beq 5f + addi r3,r1,STACK_FRAME_OVERHEAD bl .do_syscall_trace_leave REST_NVGPRS(r1) - ld r3,GPR3(r1) - ld r5,_CCR(r1) clrrdi r12,r1,THREAD_SHIFT - b syscall_exit_trace_cont -/* Stuff to do on exit from a system call. */ -syscall_exit_work: - std r3,GPR3(r1) - std r5,_CCR(r1) + /* Disable interrupts again and handle other work if any */ +5: mfmsr r10 + rldicl r10,r10,48,1 + rotldi r10,r10,16 + mtmsrd r10,1 + b .ret_from_except_lite /* Save non-volatile GPRs, if not already saved. */ @@ -252,6 +282,52 @@ _GLOBAL(save_nvgprs) std r0,_TRAP(r1) blr + +save_user_nvgprs: + ld r10,TI_SIGFRAME(r12) + andi. r0,r9,_TIF_32BIT + beq- save_user_nvgprs_64 + + /* 32-bit save to userspace */ + +.macro savewords start, end + 1: stw \start,4*(\start)(r10) + .section __ex_table,"a" + .align 3 + .llong 1b,save_user_nvgprs_fault + .previous + .if \end - \start + savewords "(\start+1)",\end + .endif +.endm + savewords 14,31 + b save_user_nvgprs_cont + +save_user_nvgprs_64: + /* 64-bit save to userspace */ + +.macro savelongs start, end + 1: std \start,8*(\start)(r10) + .section __ex_table,"a" + .align 3 + .llong 1b,save_user_nvgprs_fault + .previous + .if \end - \start + savelongs "(\start+1)",\end + .endif +.endm + savelongs 14,31 + b save_user_nvgprs_cont + +save_user_nvgprs_fault: + li r3,11 /* SIGSEGV */ + ld r4,TI_TASK(r12) + bl .force_sigsegv + + clrrdi r12,r1,THREAD_SHIFT + ld r9,TI_FLAGS(r12) + b save_user_nvgprs_cont + /* * The sigsuspend and rt_sigsuspend system calls can call do_signal * and thus put the process into the stopped state where we might @@ -260,35 +336,6 @@ _GLOBAL(save_nvgprs) * the C code. Similarly, fork, vfork and clone need the full * register state on the stack so that it can be copied to the child. */ -_GLOBAL(ppc32_sigsuspend) - bl .save_nvgprs - bl .compat_sys_sigsuspend - b 70f - -_GLOBAL(ppc64_rt_sigsuspend) - bl .save_nvgprs - bl .sys_rt_sigsuspend - b 70f - -_GLOBAL(ppc32_rt_sigsuspend) - bl .save_nvgprs - bl .compat_sys_rt_sigsuspend -70: cmpdi 0,r3,0 - /* If it returned an error, we need to return via syscall_exit to set - the SO bit in cr0 and potentially stop for ptrace. */ - bne syscall_exit - /* If sigsuspend() returns zero, we are going into a signal handler. We - may need to call audit_syscall_exit() to mark the exit from sigsuspend() */ -#ifdef CONFIG_AUDITSYSCALL - ld r3,PACACURRENT(r13) - ld r4,AUDITCONTEXT(r3) - cmpdi 0,r4,0 - beq .ret_from_except /* No audit_context: Leave immediately. */ - li r4, 2 /* AUDITSC_FAILURE */ - li r5,-4 /* It's always -EINTR */ - bl .audit_syscall_exit -#endif - b .ret_from_except _GLOBAL(ppc_fork) bl .save_nvgprs @@ -305,37 +352,6 @@ _GLOBAL(ppc_clone) bl .sys_clone b syscall_exit -_GLOBAL(ppc32_swapcontext) - bl .save_nvgprs - bl .compat_sys_swapcontext - b 80f - -_GLOBAL(ppc64_swapcontext) - bl .save_nvgprs - bl .sys_swapcontext - b 80f - -_GLOBAL(ppc32_sigreturn) - bl .compat_sys_sigreturn - b 80f - -_GLOBAL(ppc32_rt_sigreturn) - bl .compat_sys_rt_sigreturn - b 80f - -_GLOBAL(ppc64_rt_sigreturn) - bl .sys_rt_sigreturn - -80: cmpdi 0,r3,0 - blt syscall_exit - clrrdi r4,r1,THREAD_SHIFT - ld r4,TI_FLAGS(r4) - andi. r4,r4,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP) - beq+ 81f - addi r3,r1,STACK_FRAME_OVERHEAD - bl .do_syscall_trace_leave -81: b .ret_from_except - _GLOBAL(ret_from_fork) bl .schedule_tail REST_NVGPRS(r1) |