diff options
Diffstat (limited to 'arch/ppc/kernel/entry.S')
| -rw-r--r-- | arch/ppc/kernel/entry.S | 167 |
1 files changed, 96 insertions, 71 deletions
diff --git a/arch/ppc/kernel/entry.S b/arch/ppc/kernel/entry.S index f044edbb454..a48b950722a 100644 --- a/arch/ppc/kernel/entry.S +++ b/arch/ppc/kernel/entry.S @@ -200,8 +200,6 @@ _GLOBAL(DoSyscall) bl do_show_syscall #endif /* SHOW_SYSCALLS */ rlwinm r10,r1,0,0,18 /* current_thread_info() */ - li r11,0 - stb r11,TI_SC_NOERR(r10) lwz r11,TI_FLAGS(r10) andi. r11,r11,_TIF_SYSCALL_T_OR_A bne- syscall_dotrace @@ -222,25 +220,21 @@ ret_from_syscall: bl do_show_syscall_exit #endif mr r6,r3 - li r11,-_LAST_ERRNO - cmplw 0,r3,r11 rlwinm r12,r1,0,0,18 /* current_thread_info() */ - blt+ 30f - lbz r11,TI_SC_NOERR(r12) - cmpwi r11,0 - bne 30f - neg r3,r3 - lwz r10,_CCR(r1) /* Set SO bit in CR */ - oris r10,r10,0x1000 - stw r10,_CCR(r1) - /* disable interrupts so current_thread_info()->flags can't change */ -30: LOAD_MSR_KERNEL(r10,MSR_KERNEL) /* doesn't include MSR_EE */ + LOAD_MSR_KERNEL(r10,MSR_KERNEL) /* doesn't include MSR_EE */ SYNC MTMSRD(r10) lwz r9,TI_FLAGS(r12) - andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SIGPENDING|_TIF_NEED_RESCHED) + li r8,-_LAST_ERRNO + andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL) bne- syscall_exit_work + cmplw 0,r3,r8 + blt+ syscall_exit_cont + lwz r11,_CCR(r1) /* Load CR */ + neg r3,r3 + oris r11,r11,0x1000 /* Set SO bit in CR */ + stw r11,_CCR(r1) syscall_exit_cont: #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) /* If the process has its own DBCR0 value, load it up. The single @@ -292,46 +286,113 @@ syscall_dotrace: b syscall_dotrace_cont syscall_exit_work: - stw r6,RESULT(r1) /* Save result */ + andi. r0,r9,_TIF_RESTOREALL + bne- 2f + cmplw 0,r3,r8 + blt+ 1f + andi. r0,r9,_TIF_NOERROR + bne- 1f + lwz r11,_CCR(r1) /* Load CR */ + neg r3,r3 + oris r11,r11,0x1000 /* Set SO bit in CR */ + stw r11,_CCR(r1) + +1: stw r6,RESULT(r1) /* Save result */ stw r3,GPR3(r1) /* Update return value */ - andi. r0,r9,_TIF_SYSCALL_T_OR_A - beq 5f - ori r10,r10,MSR_EE - SYNC - MTMSRD(r10) /* re-enable interrupts */ +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: lwarx r8,0,r12 + andc r8,r8,r11 +#ifdef CONFIG_IBM405_ERR77 + dcbt 0,r12 +#endif + stwcx. r8,0,r12 + bne- 3b + subi r12,r12,TI_FLAGS + +4: /* Anything which requires enabling interrupts? */ + andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_SAVE_NVGPRS) + beq 7f + + /* Save NVGPRS if they're not saved already */ lwz r4,TRAP(r1) andi. r4,r4,1 - beq 4f + beq 5f SAVE_NVGPRS(r1) li r4,0xc00 stw r4,TRAP(r1) -4: + + /* Re-enable interrupts */ +5: ori r10,r10,MSR_EE + SYNC + MTMSRD(r10) + + andi. r0,r9,_TIF_SAVE_NVGPRS + bne save_user_nvgprs + +save_user_nvgprs_cont: + andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP) + beq 7f + addi r3,r1,STACK_FRAME_OVERHEAD bl do_syscall_trace_leave REST_NVGPRS(r1) -2: - lwz r3,GPR3(r1) + +6: lwz r3,GPR3(r1) LOAD_MSR_KERNEL(r10,MSR_KERNEL) /* doesn't include MSR_EE */ SYNC MTMSRD(r10) /* disable interrupts again */ rlwinm r12,r1,0,0,18 /* current_thread_info() */ lwz r9,TI_FLAGS(r12) -5: +7: andi. r0,r9,_TIF_NEED_RESCHED - bne 1f + bne 8f lwz r5,_MSR(r1) andi. r5,r5,MSR_PR - beq syscall_exit_cont + beq ret_from_except andi. r0,r9,_TIF_SIGPENDING - beq syscall_exit_cont + beq ret_from_except b do_user_signal -1: +8: ori r10,r10,MSR_EE SYNC MTMSRD(r10) /* re-enable interrupts */ bl schedule - b 2b + b 6b + +save_user_nvgprs: + lwz r8,TI_SIGFRAME(r12) + +.macro savewords start, end + 1: stw \start,4*(\start)(r8) + .section __ex_table,"a" + .align 2 + .long 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_fault: + li r3,11 /* SIGSEGV */ + lwz r4,TI_TASK(r12) + bl force_sigsegv + rlwinm r12,r1,0,0,18 /* current_thread_info() */ + lwz r9,TI_FLAGS(r12) + b save_user_nvgprs_cont + #ifdef SHOW_SYSCALLS do_show_syscall: #ifdef SHOW_SYSCALLS_TASK @@ -401,28 +462,10 @@ show_syscalls_task: #endif /* SHOW_SYSCALLS */ /* - * The sigsuspend and rt_sigsuspend system calls can call do_signal - * and thus put the process into the stopped state where we might - * want to examine its user state with ptrace. Therefore we need - * to save all the nonvolatile registers (r13 - r31) before calling - * the C code. + * The fork/clone functions need to copy the full register set into + * the child process. Therefore we need to save all the nonvolatile + * registers (r13 - r31) before calling the C code. */ - .globl ppc_sigsuspend -ppc_sigsuspend: - SAVE_NVGPRS(r1) - lwz r0,TRAP(r1) - rlwinm r0,r0,0,0,30 /* clear LSB to indicate full */ - stw r0,TRAP(r1) /* register set saved */ - b sys_sigsuspend - - .globl ppc_rt_sigsuspend -ppc_rt_sigsuspend: - SAVE_NVGPRS(r1) - lwz r0,TRAP(r1) - rlwinm r0,r0,0,0,30 - stw r0,TRAP(r1) - b sys_rt_sigsuspend - .globl ppc_fork ppc_fork: SAVE_NVGPRS(r1) @@ -447,14 +490,6 @@ ppc_clone: stw r0,TRAP(r1) /* register set saved */ b sys_clone - .globl ppc_swapcontext -ppc_swapcontext: - SAVE_NVGPRS(r1) - lwz r0,TRAP(r1) - rlwinm r0,r0,0,0,30 /* clear LSB to indicate full */ - stw r0,TRAP(r1) /* register set saved */ - b sys_swapcontext - /* * Top-level page fault handling. * This is in assembler because if do_page_fault tells us that @@ -626,16 +661,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_601) .long ret_from_except #endif - .globl sigreturn_exit -sigreturn_exit: - subi r1,r3,STACK_FRAME_OVERHEAD - rlwinm r12,r1,0,0,18 /* current_thread_info() */ - lwz r9,TI_FLAGS(r12) - andi. r0,r9,_TIF_SYSCALL_T_OR_A - beq+ ret_from_except_full - bl do_syscall_trace_leave - /* fall through */ - .globl ret_from_except_full ret_from_except_full: REST_NVGPRS(r1) @@ -658,7 +683,7 @@ user_exc_return: /* r10 contains MSR_KERNEL here */ /* Check current_thread_info()->flags */ rlwinm r9,r1,0,0,18 lwz r9,TI_FLAGS(r9) - andi. r0,r9,(_TIF_SIGPENDING|_TIF_NEED_RESCHED) + andi. r0,r9,(_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL) bne do_work restore_user: |