From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: AndrĂ© Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/ia64/kernel/entry.S | 1785 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1785 insertions(+) create mode 100644 arch/ia64/kernel/entry.S (limited to 'arch/ia64/kernel/entry.S') diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S new file mode 100644 index 000000000..fcf8b8cbc --- /dev/null +++ b/arch/ia64/kernel/entry.S @@ -0,0 +1,1785 @@ +/* + * arch/ia64/kernel/entry.S + * + * Kernel entry points. + * + * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co + * David Mosberger-Tang + * Copyright (C) 1999, 2002-2003 + * Asit Mallick + * Don Dugger + * Suresh Siddha + * Fenghua Yu + * Copyright (C) 1999 VA Linux Systems + * Copyright (C) 1999 Walt Drummond + */ +/* + * ia64_switch_to now places correct virtual mapping in in TR2 for + * kernel stack. This allows us to handle interrupts without changing + * to physical mode. + * + * Jonathan Nicklin + * Patrick O'Rourke + * 11/07/2000 + */ +/* + * Copyright (c) 2008 Isaku Yamahata + * VA Linux Systems Japan K.K. + * pv_ops. + */ +/* + * Global (preserved) predicate usage on syscall entry/exit path: + * + * pKStk: See entry.h. + * pUStk: See entry.h. + * pSys: See entry.h. + * pNonSys: !pSys + */ + + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "minstate.h" + +#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE + /* + * execve() is special because in case of success, we need to + * setup a null register window frame. + */ +ENTRY(ia64_execve) + /* + * Allocate 8 input registers since ptrace() may clobber them + */ + .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8) + alloc loc1=ar.pfs,8,2,3,0 + mov loc0=rp + .body + mov out0=in0 // filename + ;; // stop bit between alloc and call + mov out1=in1 // argv + mov out2=in2 // envp + br.call.sptk.many rp=sys_execve +.ret0: + cmp4.ge p6,p7=r8,r0 + mov ar.pfs=loc1 // restore ar.pfs + sxt4 r8=r8 // return 64-bit result + ;; + stf.spill [sp]=f0 + mov rp=loc0 +(p6) mov ar.pfs=r0 // clear ar.pfs on success +(p7) br.ret.sptk.many rp + + /* + * In theory, we'd have to zap this state only to prevent leaking of + * security sensitive state (e.g., if current->mm->dumpable is zero). However, + * this executes in less than 20 cycles even on Itanium, so it's not worth + * optimizing for...). + */ + mov ar.unat=0; mov ar.lc=0 + mov r4=0; mov f2=f0; mov b1=r0 + mov r5=0; mov f3=f0; mov b2=r0 + mov r6=0; mov f4=f0; mov b3=r0 + mov r7=0; mov f5=f0; mov b4=r0 + ldf.fill f12=[sp]; mov f13=f0; mov b5=r0 + ldf.fill f14=[sp]; ldf.fill f15=[sp]; mov f16=f0 + ldf.fill f17=[sp]; ldf.fill f18=[sp]; mov f19=f0 + ldf.fill f20=[sp]; ldf.fill f21=[sp]; mov f22=f0 + ldf.fill f23=[sp]; ldf.fill f24=[sp]; mov f25=f0 + ldf.fill f26=[sp]; ldf.fill f27=[sp]; mov f28=f0 + ldf.fill f29=[sp]; ldf.fill f30=[sp]; mov f31=f0 + br.ret.sptk.many rp +END(ia64_execve) + +/* + * sys_clone2(u64 flags, u64 ustack_base, u64 ustack_size, u64 parent_tidptr, u64 child_tidptr, + * u64 tls) + */ +GLOBAL_ENTRY(sys_clone2) + /* + * Allocate 8 input registers since ptrace() may clobber them + */ + .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8) + alloc r16=ar.pfs,8,2,6,0 + DO_SAVE_SWITCH_STACK + adds r2=PT(R16)+IA64_SWITCH_STACK_SIZE+16,sp + mov loc0=rp + mov loc1=r16 // save ar.pfs across do_fork + .body + mov out1=in1 + mov out2=in2 + tbit.nz p6,p0=in0,CLONE_SETTLS_BIT + mov out3=in3 // parent_tidptr: valid only w/CLONE_PARENT_SETTID + ;; +(p6) st8 [r2]=in5 // store TLS in r16 for copy_thread() + mov out4=in4 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID + mov out0=in0 // out0 = clone_flags + br.call.sptk.many rp=do_fork +.ret1: .restore sp + adds sp=IA64_SWITCH_STACK_SIZE,sp // pop the switch stack + mov ar.pfs=loc1 + mov rp=loc0 + br.ret.sptk.many rp +END(sys_clone2) + +/* + * sys_clone(u64 flags, u64 ustack_base, u64 parent_tidptr, u64 child_tidptr, u64 tls) + * Deprecated. Use sys_clone2() instead. + */ +GLOBAL_ENTRY(sys_clone) + /* + * Allocate 8 input registers since ptrace() may clobber them + */ + .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8) + alloc r16=ar.pfs,8,2,6,0 + DO_SAVE_SWITCH_STACK + adds r2=PT(R16)+IA64_SWITCH_STACK_SIZE+16,sp + mov loc0=rp + mov loc1=r16 // save ar.pfs across do_fork + .body + mov out1=in1 + mov out2=16 // stacksize (compensates for 16-byte scratch area) + tbit.nz p6,p0=in0,CLONE_SETTLS_BIT + mov out3=in2 // parent_tidptr: valid only w/CLONE_PARENT_SETTID + ;; +(p6) st8 [r2]=in4 // store TLS in r13 (tp) + mov out4=in3 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID + mov out0=in0 // out0 = clone_flags + br.call.sptk.many rp=do_fork +.ret2: .restore sp + adds sp=IA64_SWITCH_STACK_SIZE,sp // pop the switch stack + mov ar.pfs=loc1 + mov rp=loc0 + br.ret.sptk.many rp +END(sys_clone) +#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */ + +/* + * prev_task <- ia64_switch_to(struct task_struct *next) + * With Ingo's new scheduler, interrupts are disabled when this routine gets + * called. The code starting at .map relies on this. The rest of the code + * doesn't care about the interrupt masking status. + */ +GLOBAL_ENTRY(__paravirt_switch_to) + .prologue + alloc r16=ar.pfs,1,0,0,0 + DO_SAVE_SWITCH_STACK + .body + + adds r22=IA64_TASK_THREAD_KSP_OFFSET,r13 + movl r25=init_task + mov r27=IA64_KR(CURRENT_STACK) + adds r21=IA64_TASK_THREAD_KSP_OFFSET,in0 + dep r20=0,in0,61,3 // physical address of "next" + ;; + st8 [r22]=sp // save kernel stack pointer of old task + shr.u r26=r20,IA64_GRANULE_SHIFT + cmp.eq p7,p6=r25,in0 + ;; + /* + * If we've already mapped this task's page, we can skip doing it again. + */ +(p6) cmp.eq p7,p6=r26,r27 +(p6) br.cond.dpnt .map + ;; +.done: + ld8 sp=[r21] // load kernel stack pointer of new task + MOV_TO_KR(CURRENT, in0, r8, r9) // update "current" application register + mov r8=r13 // return pointer to previously running task + mov r13=in0 // set "current" pointer + ;; + DO_LOAD_SWITCH_STACK + +#ifdef CONFIG_SMP + sync.i // ensure "fc"s done by this CPU are visible on other CPUs +#endif + br.ret.sptk.many rp // boogie on out in new context + +.map: + RSM_PSR_IC(r25) // interrupts (psr.i) are already disabled here + movl r25=PAGE_KERNEL + ;; + srlz.d + or r23=r25,r20 // construct PA | page properties + mov r25=IA64_GRANULE_SHIFT<<2 + ;; + MOV_TO_ITIR(p0, r25, r8) + MOV_TO_IFA(in0, r8) // VA of next task... + ;; + mov r25=IA64_TR_CURRENT_STACK + MOV_TO_KR(CURRENT_STACK, r26, r8, r9) // remember last page we mapped... + ;; + itr.d dtr[r25]=r23 // wire in new mapping... + SSM_PSR_IC_AND_SRLZ_D(r8, r9) // reenable the psr.ic bit + br.cond.sptk .done +END(__paravirt_switch_to) + +#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE +/* + * Note that interrupts are enabled during save_switch_stack and load_switch_stack. This + * means that we may get an interrupt with "sp" pointing to the new kernel stack while + * ar.bspstore is still pointing to the old kernel backing store area. Since ar.rsc, + * ar.rnat, ar.bsp, and ar.bspstore are all preserved by interrupts, this is not a + * problem. Also, we don't need to specify unwind information for preserved registers + * that are not modified in save_switch_stack as the right unwind information is already + * specified at the call-site of save_switch_stack. + */ + +/* + * save_switch_stack: + * - r16 holds ar.pfs + * - b7 holds address to return to + * - rp (b0) holds return address to save + */ +GLOBAL_ENTRY(save_switch_stack) + .prologue + .altrp b7 + flushrs // flush dirty regs to backing store (must be first in insn group) + .save @priunat,r17 + mov r17=ar.unat // preserve caller's + .body +#ifdef CONFIG_ITANIUM + adds r2=16+128,sp + adds r3=16+64,sp + adds r14=SW(R4)+16,sp + ;; + st8.spill [r14]=r4,16 // spill r4 + lfetch.fault.excl.nt1 [r3],128 + ;; + lfetch.fault.excl.nt1 [r2],128 + lfetch.fault.excl.nt1 [r3],128 + ;; + lfetch.fault.excl [r2] + lfetch.fault.excl [r3] + adds r15=SW(R5)+16,sp +#else + add r2=16+3*128,sp + add r3=16,sp + add r14=SW(R4)+16,sp + ;; + st8.spill [r14]=r4,SW(R6)-SW(R4) // spill r4 and prefetch offset 0x1c0 + lfetch.fault.excl.nt1 [r3],128 // prefetch offset 0x010 + ;; + lfetch.fault.excl.nt1 [r3],128 // prefetch offset 0x090 + lfetch.fault.excl.nt1 [r2],128 // prefetch offset 0x190 + ;; + lfetch.fault.excl.nt1 [r3] // prefetch offset 0x110 + lfetch.fault.excl.nt1 [r2] // prefetch offset 0x210 + adds r15=SW(R5)+16,sp +#endif + ;; + st8.spill [r15]=r5,SW(R7)-SW(R5) // spill r5 + mov.m ar.rsc=0 // put RSE in mode: enforced lazy, little endian, pl 0 + add r2=SW(F2)+16,sp // r2 = &sw->f2 + ;; + st8.spill [r14]=r6,SW(B0)-SW(R6) // spill r6 + mov.m r18=ar.fpsr // preserve fpsr + add r3=SW(F3)+16,sp // r3 = &sw->f3 + ;; + stf.spill [r2]=f2,32 + mov.m r19=ar.rnat + mov r21=b0 + + stf.spill [r3]=f3,32 + st8.spill [r15]=r7,SW(B2)-SW(R7) // spill r7 + mov r22=b1 + ;; + // since we're done with the spills, read and save ar.unat: + mov.m r29=ar.unat + mov.m r20=ar.bspstore + mov r23=b2 + stf.spill [r2]=f4,32 + stf.spill [r3]=f5,32 + mov r24=b3 + ;; + st8 [r14]=r21,SW(B1)-SW(B0) // save b0 + st8 [r15]=r23,SW(B3)-SW(B2) // save b2 + mov r25=b4 + mov r26=b5 + ;; + st8 [r14]=r22,SW(B4)-SW(B1) // save b1 + st8 [r15]=r24,SW(AR_PFS)-SW(B3) // save b3 + mov r21=ar.lc // I-unit + stf.spill [r2]=f12,32 + stf.spill [r3]=f13,32 + ;; + st8 [r14]=r25,SW(B5)-SW(B4) // save b4 + st8 [r15]=r16,SW(AR_LC)-SW(AR_PFS) // save ar.pfs + stf.spill [r2]=f14,32 + stf.spill [r3]=f15,32 + ;; + st8 [r14]=r26 // save b5 + st8 [r15]=r21 // save ar.lc + stf.spill [r2]=f16,32 + stf.spill [r3]=f17,32 + ;; + stf.spill [r2]=f18,32 + stf.spill [r3]=f19,32 + ;; + stf.spill [r2]=f20,32 + stf.spill [r3]=f21,32 + ;; + stf.spill [r2]=f22,32 + stf.spill [r3]=f23,32 + ;; + stf.spill [r2]=f24,32 + stf.spill [r3]=f25,32 + ;; + stf.spill [r2]=f26,32 + stf.spill [r3]=f27,32 + ;; + stf.spill [r2]=f28,32 + stf.spill [r3]=f29,32 + ;; + stf.spill [r2]=f30,SW(AR_UNAT)-SW(F30) + stf.spill [r3]=f31,SW(PR)-SW(F31) + add r14=SW(CALLER_UNAT)+16,sp + ;; + st8 [r2]=r29,SW(AR_RNAT)-SW(AR_UNAT) // save ar.unat + st8 [r14]=r17,SW(AR_FPSR)-SW(CALLER_UNAT) // save caller_unat + mov r21=pr + ;; + st8 [r2]=r19,SW(AR_BSPSTORE)-SW(AR_RNAT) // save ar.rnat + st8 [r3]=r21 // save predicate registers + ;; + st8 [r2]=r20 // save ar.bspstore + st8 [r14]=r18 // save fpsr + mov ar.rsc=3 // put RSE back into eager mode, pl 0 + br.cond.sptk.many b7 +END(save_switch_stack) + +/* + * load_switch_stack: + * - "invala" MUST be done at call site (normally in DO_LOAD_SWITCH_STACK) + * - b7 holds address to return to + * - must not touch r8-r11 + */ +GLOBAL_ENTRY(load_switch_stack) + .prologue + .altrp b7 + + .body + lfetch.fault.nt1 [sp] + adds r2=SW(AR_BSPSTORE)+16,sp + adds r3=SW(AR_UNAT)+16,sp + mov ar.rsc=0 // put RSE into enforced lazy mode + adds r14=SW(CALLER_UNAT)+16,sp + adds r15=SW(AR_FPSR)+16,sp + ;; + ld8 r27=[r2],(SW(B0)-SW(AR_BSPSTORE)) // bspstore + ld8 r29=[r3],(SW(B1)-SW(AR_UNAT)) // unat + ;; + ld8 r21=[r2],16 // restore b0 + ld8 r22=[r3],16 // restore b1 + ;; + ld8 r23=[r2],16 // restore b2 + ld8 r24=[r3],16 // restore b3 + ;; + ld8 r25=[r2],16 // restore b4 + ld8 r26=[r3],16 // restore b5 + ;; + ld8 r16=[r2],(SW(PR)-SW(AR_PFS)) // ar.pfs + ld8 r17=[r3],(SW(AR_RNAT)-SW(AR_LC)) // ar.lc + ;; + ld8 r28=[r2] // restore pr + ld8 r30=[r3] // restore rnat + ;; + ld8 r18=[r14],16 // restore caller's unat + ld8 r19=[r15],24 // restore fpsr + ;; + ldf.fill f2=[r14],32 + ldf.fill f3=[r15],32 + ;; + ldf.fill f4=[r14],32 + ldf.fill f5=[r15],32 + ;; + ldf.fill f12=[r14],32 + ldf.fill f13=[r15],32 + ;; + ldf.fill f14=[r14],32 + ldf.fill f15=[r15],32 + ;; + ldf.fill f16=[r14],32 + ldf.fill f17=[r15],32 + ;; + ldf.fill f18=[r14],32 + ldf.fill f19=[r15],32 + mov b0=r21 + ;; + ldf.fill f20=[r14],32 + ldf.fill f21=[r15],32 + mov b1=r22 + ;; + ldf.fill f22=[r14],32 + ldf.fill f23=[r15],32 + mov b2=r23 + ;; + mov ar.bspstore=r27 + mov ar.unat=r29 // establish unat holding the NaT bits for r4-r7 + mov b3=r24 + ;; + ldf.fill f24=[r14],32 + ldf.fill f25=[r15],32 + mov b4=r25 + ;; + ldf.fill f26=[r14],32 + ldf.fill f27=[r15],32 + mov b5=r26 + ;; + ldf.fill f28=[r14],32 + ldf.fill f29=[r15],32 + mov ar.pfs=r16 + ;; + ldf.fill f30=[r14],32 + ldf.fill f31=[r15],24 + mov ar.lc=r17 + ;; + ld8.fill r4=[r14],16 + ld8.fill r5=[r15],16 + mov pr=r28,-1 + ;; + ld8.fill r6=[r14],16 + ld8.fill r7=[r15],16 + + mov ar.unat=r18 // restore caller's unat + mov ar.rnat=r30 // must restore after bspstore but before rsc! + mov ar.fpsr=r19 // restore fpsr + mov ar.rsc=3 // put RSE back into eager mode, pl 0 + br.cond.sptk.many b7 +END(load_switch_stack) + +GLOBAL_ENTRY(prefetch_stack) + add r14 = -IA64_SWITCH_STACK_SIZE, sp + add r15 = IA64_TASK_THREAD_KSP_OFFSET, in0 + ;; + ld8 r16 = [r15] // load next's stack pointer + lfetch.fault.excl [r14], 128 + ;; + lfetch.fault.excl [r14], 128 + lfetch.fault [r16], 128 + ;; + lfetch.fault.excl [r14], 128 + lfetch.fault [r16], 128 + ;; + lfetch.fault.excl [r14], 128 + lfetch.fault [r16], 128 + ;; + lfetch.fault.excl [r14], 128 + lfetch.fault [r16], 128 + ;; + lfetch.fault [r16], 128 + br.ret.sptk.many rp +END(prefetch_stack) + + /* + * Invoke a system call, but do some tracing before and after the call. + * We MUST preserve the current register frame throughout this routine + * because some system calls (such as ia64_execve) directly + * manipulate ar.pfs. + */ +GLOBAL_ENTRY(ia64_trace_syscall) + PT_REGS_UNWIND_INFO(0) + /* + * We need to preserve the scratch registers f6-f11 in case the system + * call is sigreturn. + */ + adds r16=PT(F6)+16,sp + adds r17=PT(F7)+16,sp + ;; + stf.spill [r16]=f6,32 + stf.spill [r17]=f7,32 + ;; + stf.spill [r16]=f8,32 + stf.spill [r17]=f9,32 + ;; + stf.spill [r16]=f10 + stf.spill [r17]=f11 + br.call.sptk.many rp=syscall_trace_enter // give parent a chance to catch syscall args + cmp.lt p6,p0=r8,r0 // check tracehook + adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8 + adds r3=PT(R10)+16,sp // r3 = &pt_regs.r10 + mov r10=0 +(p6) br.cond.sptk strace_error // syscall failed -> + adds r16=PT(F6)+16,sp + adds r17=PT(F7)+16,sp + ;; + ldf.fill f6=[r16],32 + ldf.fill f7=[r17],32 + ;; + ldf.fill f8=[r16],32 + ldf.fill f9=[r17],32 + ;; + ldf.fill f10=[r16] + ldf.fill f11=[r17] + // the syscall number may have changed, so re-load it and re-calculate the + // syscall entry-point: + adds r15=PT(R15)+16,sp // r15 = &pt_regs.r15 (syscall #) + ;; + ld8 r15=[r15] + mov r3=NR_syscalls - 1 + ;; + adds r15=-1024,r15 + movl r16=sys_call_table + ;; + shladd r20=r15,3,r16 // r20 = sys_call_table + 8*(syscall-1024) + cmp.leu p6,p7=r15,r3 + ;; +(p6) ld8 r20=[r20] // load address of syscall entry point +(p7) movl r20=sys_ni_syscall + ;; + mov b6=r20 + br.call.sptk.many rp=b6 // do the syscall +.strace_check_retval: + cmp.lt p6,p0=r8,r0 // syscall failed? + adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8 + adds r3=PT(R10)+16,sp // r3 = &pt_regs.r10 + mov r10=0 +(p6) br.cond.sptk strace_error // syscall failed -> + ;; // avoid RAW on r10 +.strace_save_retval: +.mem.offset 0,0; st8.spill [r2]=r8 // store return value in slot for r8 +.mem.offset 8,0; st8.spill [r3]=r10 // clear error indication in slot for r10 + br.call.sptk.many rp=syscall_trace_leave // give parent a chance to catch return value +.ret3: +(pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk +(pUStk) rsm psr.i // disable interrupts + br.cond.sptk ia64_work_pending_syscall_end + +strace_error: + ld8 r3=[r2] // load pt_regs.r8 + sub r9=0,r8 // negate return value to get errno value + ;; + cmp.ne p6,p0=r3,r0 // is pt_regs.r8!=0? + adds r3=16,r2 // r3=&pt_regs.r10 + ;; +(p6) mov r10=-1 +(p6) mov r8=r9 + br.cond.sptk .strace_save_retval +END(ia64_trace_syscall) + + /* + * When traced and returning from sigreturn, we invoke syscall_trace but then + * go straight to ia64_leave_kernel rather than ia64_leave_syscall. + */ +GLOBAL_ENTRY(ia64_strace_leave_kernel) + PT_REGS_UNWIND_INFO(0) +{ /* + * Some versions of gas generate bad unwind info if the first instruction of a + * procedure doesn't go into the first slot of a bundle. This is a workaround. + */ + nop.m 0 + nop.i 0 + br.call.sptk.many rp=syscall_trace_leave // give parent a chance to catch return value +} +.ret4: br.cond.sptk ia64_leave_kernel +END(ia64_strace_leave_kernel) + +ENTRY(call_payload) + .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(0) + /* call the kernel_thread payload; fn is in r4, arg - in r5 */ + alloc loc1=ar.pfs,0,3,1,0 + mov loc0=rp + mov loc2=gp + mov out0=r5 // arg + ld8 r14 = [r4], 8 // fn.address + ;; + mov b6 = r14 + ld8 gp = [r4] // fn.gp + ;; + br.call.sptk.many rp=b6 // fn(arg) +.ret12: mov gp=loc2 + mov rp=loc0 + mov ar.pfs=loc1 + /* ... and if it has returned, we are going to userland */ + cmp.ne pKStk,pUStk=r0,r0 + br.ret.sptk.many rp +END(call_payload) + +GLOBAL_ENTRY(ia64_ret_from_clone) + PT_REGS_UNWIND_INFO(0) +{ /* + * Some versions of gas generate bad unwind info if the first instruction of a + * procedure doesn't go into the first slot of a bundle. This is a workaround. + */ + nop.m 0 + nop.i 0 + /* + * We need to call schedule_tail() to complete the scheduling process. + * Called by ia64_switch_to() after do_fork()->copy_thread(). r8 contains the + * address of the previously executing task. + */ + br.call.sptk.many rp=ia64_invoke_schedule_tail +} +.ret8: +(pKStk) br.call.sptk.many rp=call_payload + adds r2=TI_FLAGS+IA64_TASK_SIZE,r13 + ;; + ld4 r2=[r2] + ;; + mov r8=0 + and r2=_TIF_SYSCALL_TRACEAUDIT,r2 + ;; + cmp.ne p6,p0=r2,r0 +(p6) br.cond.spnt .strace_check_retval + ;; // added stop bits to prevent r8 dependency +END(ia64_ret_from_clone) + // fall through +GLOBAL_ENTRY(ia64_ret_from_syscall) + PT_REGS_UNWIND_INFO(0) + cmp.ge p6,p7=r8,r0 // syscall executed successfully? + adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8 + mov r10=r0 // clear error indication in r10 +(p7) br.cond.spnt handle_syscall_error // handle potential syscall failure +#ifdef CONFIG_PARAVIRT + ;; + br.cond.sptk.few ia64_leave_syscall + ;; +#endif /* CONFIG_PARAVIRT */ +END(ia64_ret_from_syscall) +#ifndef CONFIG_PARAVIRT + // fall through +#endif +#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */ + +/* + * ia64_leave_syscall(): Same as ia64_leave_kernel, except that it doesn't + * need to switch to bank 0 and doesn't restore the scratch registers. + * To avoid leaking kernel bits, the scratch registers are set to + * the following known-to-be-safe values: + * + * r1: restored (global pointer) + * r2: cleared + * r3: 1 (when returning to user-level) + * r8-r11: restored (syscall return value(s)) + * r12: restored (user-level stack pointer) + * r13: restored (user-level thread pointer) + * r14: set to __kernel_syscall_via_epc + * r15: restored (syscall #) + * r16-r17: cleared + * r18: user-level b6 + * r19: cleared + * r20: user-level ar.fpsr + * r21: user-level b0 + * r22: cleared + * r23: user-level ar.bspstore + * r24: user-level ar.rnat + * r25: user-level ar.unat + * r26: user-level ar.pfs + * r27: user-level ar.rsc + * r28: user-level ip + * r29: user-level psr + * r30: user-level cfm + * r31: user-level pr + * f6-f11: cleared + * pr: restored (user-level pr) + * b0: restored (user-level rp) + * b6: restored + * b7: set to __kernel_syscall_via_epc + * ar.unat: restored (user-level ar.unat) + * ar.pfs: restored (user-level ar.pfs) + * ar.rsc: restored (user-level ar.rsc) + * ar.rnat: restored (user-level ar.rnat) + * ar.bspstore: restored (user-level ar.bspstore) + * ar.fpsr: restored (user-level ar.fpsr) + * ar.ccv: cleared + * ar.csd: cleared + * ar.ssd: cleared + */ +GLOBAL_ENTRY(__paravirt_leave_syscall) + PT_REGS_UNWIND_INFO(0) + /* + * work.need_resched etc. mustn't get changed by this CPU before it returns to + * user- or fsys-mode, hence we disable interrupts early on. + * + * p6 controls whether current_thread_info()->flags needs to be check for + * extra work. We always check for extra work when returning to user-level. + * With CONFIG_PREEMPT, we also check for extra work when the preempt_count + * is 0. After extra work processing has been completed, execution + * resumes at ia64_work_processed_syscall with p6 set to 1 if the extra-work-check + * needs to be redone. + */ +#ifdef CONFIG_PREEMPT + RSM_PSR_I(p0, r2, r18) // disable interrupts + cmp.eq pLvSys,p0=r0,r0 // pLvSys=1: leave from syscall +(pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13 + ;; + .pred.rel.mutex pUStk,pKStk +(pKStk) ld4 r21=[r20] // r21 <- preempt_count +(pUStk) mov r21=0 // r21 <- 0 + ;; + cmp.eq p6,p0=r21,r0 // p6 <- pUStk || (preempt_count == 0) +#else /* !CONFIG_PREEMPT */ + RSM_PSR_I(pUStk, r2, r18) + cmp.eq pLvSys,p0=r0,r0 // pLvSys=1: leave from syscall +(pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk +#endif +.global __paravirt_work_processed_syscall; +__paravirt_work_processed_syscall: +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE + adds r2=PT(LOADRS)+16,r12 + MOV_FROM_ITC(pUStk, p9, r22, r19) // fetch time at leave + adds r18=TI_FLAGS+IA64_TASK_SIZE,r13 + ;; +(p6) ld4 r31=[r18] // load current_thread_info()->flags + ld8 r19=[r2],PT(B6)-PT(LOADRS) // load ar.rsc value for "loadrs" + adds r3=PT(AR_BSPSTORE)+16,r12 // deferred + ;; +#else + adds r2=PT(LOADRS)+16,r12 + adds r3=PT(AR_BSPSTORE)+16,r12 + adds r18=TI_FLAGS+IA64_TASK_SIZE,r13 + ;; +(p6) ld4 r31=[r18] // load current_thread_info()->flags + ld8 r19=[r2],PT(B6)-PT(LOADRS) // load ar.rsc value for "loadrs" + nop.i 0 + ;; +#endif + mov r16=ar.bsp // M2 get existing backing store pointer + ld8 r18=[r2],PT(R9)-PT(B6) // load b6 +(p6) and r15=TIF_WORK_MASK,r31 // any work other than TIF_SYSCALL_TRACE? + ;; + ld8 r23=[r3],PT(R11)-PT(AR_BSPSTORE) // load ar.bspstore (may be garbage) +(p6) cmp4.ne.unc p6,p0=r15, r0 // any special work pending? +(p6) br.cond.spnt .work_pending_syscall + ;; + // start restoring the state saved on the kernel stack (struct pt_regs): + ld8 r9=[r2],PT(CR_IPSR)-PT(R9) + ld8 r11=[r3],PT(CR_IIP)-PT(R11) +(pNonSys) break 0 // bug check: we shouldn't be here if pNonSys is TRUE! + ;; + invala // M0|1 invalidate ALAT + RSM_PSR_I_IC(r28, r29, r30) // M2 turn off interrupts and interruption collection + cmp.eq p9,p0=r0,r0 // A set p9 to indicate that we should restore cr.ifs + + ld8 r29=[r2],16 // M0|1 load cr.ipsr + ld8 r28=[r3],16 // M0|1 load cr.iip +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE +(pUStk) add r14=TI_AC_LEAVE+IA64_TASK_SIZE,r13 + ;; + ld8 r30=[r2],16 // M0|1 load cr.ifs + ld8 r25=[r3],16 // M0|1 load ar.unat +(pUStk) add r15=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13 + ;; +#else + mov r22=r0 // A clear r22 + ;; + ld8 r30=[r2],16 // M0|1 load cr.ifs + ld8 r25=[r3],16 // M0|1 load ar.unat +(pUStk) add r14=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13 + ;; +#endif + ld8 r26=[r2],PT(B0)-PT(AR_PFS) // M0|1 load ar.pfs + MOV_FROM_PSR(pKStk, r22, r21) // M2 read PSR now that interrupts are disabled + nop 0 + ;; + ld8 r21=[r2],PT(AR_RNAT)-PT(B0) // M0|1 load b0 + ld8 r27=[r3],PT(PR)-PT(AR_RSC) // M0|1 load ar.rsc + mov f6=f0 // F clear f6 + ;; + ld8 r24=[r2],PT(AR_FPSR)-PT(AR_RNAT) // M0|1 load ar.rnat (may be garbage) + ld8 r31=[r3],PT(R1)-PT(PR) // M0|1 load predicates + mov f7=f0 // F clear f7 + ;; + ld8 r20=[r2],PT(R12)-PT(AR_FPSR) // M0|1 load ar.fpsr + ld8.fill r1=[r3],16 // M0|1 load r1 +(pUStk) mov r17=1 // A + ;; +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE +(pUStk) st1 [r15]=r17 // M2|3 +#else +(pUStk) st1 [r14]=r17 // M2|3 +#endif + ld8.fill r13=[r3],16 // M0|1 + mov f8=f0 // F clear f8 + ;; + ld8.fill r12=[r2] // M0|1 restore r12 (sp) + ld8.fill r15=[r3] // M0|1 restore r15 + mov b6=r18 // I0 restore b6 + + LOAD_PHYS_STACK_REG_SIZE(r17) + mov f9=f0 // F clear f9 +(pKStk) br.cond.dpnt.many skip_rbs_switch // B + + srlz.d // M0 ensure interruption collection is off (for cover) + shr.u r18=r19,16 // I0|1 get byte size of existing "dirty" partition + COVER // B add current frame into dirty partition & set cr.ifs + ;; +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE + mov r19=ar.bsp // M2 get new backing store pointer + st8 [r14]=r22 // M save time at leave + mov f10=f0 // F clear f10 + + mov r22=r0 // A clear r22 + movl r14=__kernel_syscall_via_epc // X + ;; +#else + mov r19=ar.bsp // M2 get new backing store pointer + mov f10=f0 // F clear f10 + + nop.m 0 + movl r14=__kernel_syscall_via_epc // X + ;; +#endif + mov.m ar.csd=r0 // M2 clear ar.csd + mov.m ar.ccv=r0 // M2 clear ar.ccv + mov b7=r14 // I0 clear b7 (hint with __kernel_syscall_via_epc) + + mov.m ar.ssd=r0 // M2 clear ar.ssd + mov f11=f0 // F clear f11 + br.cond.sptk.many rbs_switch // B +END(__paravirt_leave_syscall) + +GLOBAL_ENTRY(__paravirt_leave_kernel) + PT_REGS_UNWIND_INFO(0) + /* + * work.need_resched etc. mustn't get changed by this CPU before it returns to + * user- or fsys-mode, hence we disable interrupts early on. + * + * p6 controls whether current_thread_info()->flags needs to be check for + * extra work. We always check for extra work when returning to user-level. + * With CONFIG_PREEMPT, we also check for extra work when the preempt_count + * is 0. After extra work processing has been completed, execution + * resumes at .work_processed_syscall with p6 set to 1 if the extra-work-check + * needs to be redone. + */ +#ifdef CONFIG_PREEMPT + RSM_PSR_I(p0, r17, r31) // disable interrupts + cmp.eq p0,pLvSys=r0,r0 // pLvSys=0: leave from kernel +(pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13 + ;; + .pred.rel.mutex pUStk,pKStk +(pKStk) ld4 r21=[r20] // r21 <- preempt_count +(pUStk) mov r21=0 // r21 <- 0 + ;; + cmp.eq p6,p0=r21,r0 // p6 <- pUStk || (preempt_count == 0) +#else + RSM_PSR_I(pUStk, r17, r31) + cmp.eq p0,pLvSys=r0,r0 // pLvSys=0: leave from kernel +(pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk +#endif +.work_processed_kernel: + adds r17=TI_FLAGS+IA64_TASK_SIZE,r13 + ;; +(p6) ld4 r31=[r17] // load current_thread_info()->flags + adds r21=PT(PR)+16,r12 + ;; + + lfetch [r21],PT(CR_IPSR)-PT(PR) + adds r2=PT(B6)+16,r12 + adds r3=PT(R16)+16,r12 + ;; + lfetch [r21] + ld8 r28=[r2],8 // load b6 + adds r29=PT(R24)+16,r12 + + ld8.fill r16=[r3],PT(AR_CSD)-PT(R16) + adds r30=PT(AR_CCV)+16,r12 +(p6) and r19=TIF_WORK_MASK,r31 // any work other than TIF_SYSCALL_TRACE? + ;; + ld8.fill r24=[r29] + ld8 r15=[r30] // load ar.ccv +(p6) cmp4.ne.unc p6,p0=r19, r0 // any special work pending? + ;; + ld8 r29=[r2],16 // load b7 + ld8 r30=[r3],16 // load ar.csd +(p6) br.cond.spnt .work_pending + ;; + ld8 r31=[r2],16 // load ar.ssd + ld8.fill r8=[r3],16 + ;; + ld8.fill r9=[r2],16 + ld8.fill r10=[r3],PT(R17)-PT(R10) + ;; + ld8.fill r11=[r2],PT(R18)-PT(R11) + ld8.fill r17=[r3],16 + ;; + ld8.fill r18=[r2],16 + ld8.fill r19=[r3],16 + ;; + ld8.fill r20=[r2],16 + ld8.fill r21=[r3],16 + mov ar.csd=r30 + mov ar.ssd=r31 + ;; + RSM_PSR_I_IC(r23, r22, r25) // initiate turning off of interrupt and interruption collection + invala // invalidate ALAT + ;; + ld8.fill r22=[r2],24 + ld8.fill r23=[r3],24 + mov b6=r28 + ;; + ld8.fill r25=[r2],16 + ld8.fill r26=[r3],16 + mov b7=r29 + ;; + ld8.fill r27=[r2],16 + ld8.fill r28=[r3],16 + ;; + ld8.fill r29=[r2],16 + ld8.fill r30=[r3],24 + ;; + ld8.fill r31=[r2],PT(F9)-PT(R31) + adds r3=PT(F10)-PT(F6),r3 + ;; + ldf.fill f9=[r2],PT(F6)-PT(F9) + ldf.fill f10=[r3],PT(F8)-PT(F10) + ;; + ldf.fill f6=[r2],PT(F7)-PT(F6) + ;; + ldf.fill f7=[r2],PT(F11)-PT(F7) + ldf.fill f8=[r3],32 + ;; + srlz.d // ensure that inter. collection is off (VHPT is don't care, since text is pinned) + mov ar.ccv=r15 + ;; + ldf.fill f11=[r2] + BSW_0(r2, r3, r15) // switch back to bank 0 (no stop bit required beforehand...) + ;; +(pUStk) mov r18=IA64_KR(CURRENT)// M2 (12 cycle read latency) + adds r16=PT(CR_IPSR)+16,r12 + adds r17=PT(CR_IIP)+16,r12 + +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE + .pred.rel.mutex pUStk,pKStk + MOV_FROM_PSR(pKStk, r22, r29) // M2 read PSR now that interrupts are disabled + MOV_FROM_ITC(pUStk, p9, r22, r29) // M fetch time at leave + nop.i 0 + ;; +#else + MOV_FROM_PSR(pKStk, r22, r29) // M2 read PSR now that interrupts are disabled + nop.i 0 + nop.i 0 + ;; +#endif + ld8 r29=[r16],16 // load cr.ipsr + ld8 r28=[r17],16 // load cr.iip + ;; + ld8 r30=[r16],16 // load cr.ifs + ld8 r25=[r17],16 // load ar.unat + ;; + ld8 r26=[r16],16 // load ar.pfs + ld8 r27=[r17],16 // load ar.rsc + cmp.eq p9,p0=r0,r0 // set p9 to indicate that we should restore cr.ifs + ;; + ld8 r24=[r16],16 // load ar.rnat (may be garbage) + ld8 r23=[r17],16 // load ar.bspstore (may be garbage) + ;; + ld8 r31=[r16],16 // load predicates + ld8 r21=[r17],16 // load b0 + ;; + ld8 r19=[r16],16 // load ar.rsc value for "loadrs" + ld8.fill r1=[r17],16 // load r1 + ;; + ld8.fill r12=[r16],16 + ld8.fill r13=[r17],16 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE +(pUStk) adds r3=TI_AC_LEAVE+IA64_TASK_SIZE,r18 +#else +(pUStk) adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18 +#endif + ;; + ld8 r20=[r16],16 // ar.fpsr + ld8.fill r15=[r17],16 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE +(pUStk) adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18 // deferred +#endif + ;; + ld8.fill r14=[r16],16 + ld8.fill r2=[r17] +(pUStk) mov r17=1 + ;; +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE + // mmi_ : ld8 st1 shr;; mmi_ : st8 st1 shr;; + // mib : mov add br -> mib : ld8 add br + // bbb_ : br nop cover;; mbb_ : mov br cover;; + // + // no one require bsp in r16 if (pKStk) branch is selected. +(pUStk) st8 [r3]=r22 // save time at leave +(pUStk) st1 [r18]=r17 // restore current->thread.on_ustack + shr.u r18=r19,16 // get byte size of existing "dirty" partition + ;; + ld8.fill r3=[r16] // deferred + LOAD_PHYS_STACK_REG_SIZE(r17) +(pKStk) br.cond.dpnt skip_rbs_switch + mov r16=ar.bsp // get existing backing store pointer +#else + ld8.fill r3=[r16] +(pUStk) st1 [r18]=r17 // restore current->thread.on_ustack + shr.u r18=r19,16 // get byte size of existing "dirty" partition + ;; + mov r16=ar.bsp // get existing backing store pointer + LOAD_PHYS_STACK_REG_SIZE(r17) +(pKStk) br.cond.dpnt skip_rbs_switch +#endif + + /* + * Restore user backing store. + * + * NOTE: alloc, loadrs, and cover can't be predicated. + */ +(pNonSys) br.cond.dpnt dont_preserve_current_frame + COVER // add current frame into dirty partition and set cr.ifs + ;; + mov r19=ar.bsp // get new backing store pointer +rbs_switch: + sub r16=r16,r18 // krbs = old bsp - size of dirty partition + cmp.ne p9,p0=r0,r0 // clear p9 to skip restore of cr.ifs + ;; + sub r19=r19,r16 // calculate total byte size of dirty partition + add r18=64,r18 // don't force in0-in7 into memory... + ;; + shl r19=r19,16 // shift size of dirty partition into loadrs position + ;; +dont_preserve_current_frame: + /* + * To prevent leaking bits between the kernel and user-space, + * we must clear the stacked registers in the "invalid" partition here. + * Not pretty, but at least it's fast (3.34 registers/cycle on Itanium, + * 5 registers/cycle on McKinley). + */ +# define pRecurse p6 +# define pReturn p7 +#ifdef CONFIG_ITANIUM +# define Nregs 10 +#else +# define Nregs 14 +#endif + alloc loc0=ar.pfs,2,Nregs-2,2,0 + shr.u loc1=r18,9 // RNaTslots <= floor(dirtySize / (64*8)) + sub r17=r17,r18 // r17 = (physStackedSize + 8) - dirtySize + ;; + mov ar.rsc=r19 // load ar.rsc to be used for "loadrs" + shladd in0=loc1,3,r17 + mov in1=0 + ;; + TEXT_ALIGN(32) +rse_clear_invalid: +#ifdef CONFIG_ITANIUM + // cycle 0 + { .mii + alloc loc0=ar.pfs,2,Nregs-2,2,0 + cmp.lt pRecurse,p0=Nregs*8,in0 // if more than Nregs regs left to clear, (re)curse + add out0=-Nregs*8,in0 +}{ .mfb + add out1=1,in1 // increment recursion count + nop.f 0 + nop.b 0 // can't do br.call here because of alloc (WAW on CFM) + ;; +}{ .mfi // cycle 1 + mov loc1=0 + nop.f 0 + mov loc2=0 +}{ .mib + mov loc3=0 + mov loc4=0 +(pRecurse) br.call.sptk.many b0=rse_clear_invalid + +}{ .mfi // cycle 2 + mov loc5=0 + nop.f 0 + cmp.ne pReturn,p0=r0,in1 // if recursion count != 0, we need to do a br.ret +}{ .mib + mov loc6=0 + mov loc7=0 +(pReturn) br.ret.sptk.many b0 +} +#else /* !CONFIG_ITANIUM */ + alloc loc0=ar.pfs,2,Nregs-2,2,0 + cmp.lt pRecurse,p0=Nregs*8,in0 // if more than Nregs regs left to clear, (re)curse + add out0=-Nregs*8,in0 + add out1=1,in1 // increment recursion count + mov loc1=0 + mov loc2=0 + ;; + mov loc3=0 + mov loc4=0 + mov loc5=0 + mov loc6=0 + mov loc7=0 +(pRecurse) br.call.dptk.few b0=rse_clear_invalid + ;; + mov loc8=0 + mov loc9=0 + cmp.ne pReturn,p0=r0,in1 // if recursion count != 0, we need to do a br.ret + mov loc10=0 + mov loc11=0 +(pReturn) br.ret.dptk.many b0 +#endif /* !CONFIG_ITANIUM */ +# undef pRecurse +# undef pReturn + ;; + alloc r17=ar.pfs,0,0,0,0 // drop current register frame + ;; + loadrs + ;; +skip_rbs_switch: + mov ar.unat=r25 // M2 +(pKStk) extr.u r22=r22,21,1 // I0 extract current value of psr.pp from r22 +(pLvSys)mov r19=r0 // A clear r19 for leave_syscall, no-op otherwise + ;; +(pUStk) mov ar.bspstore=r23 // M2 +(pKStk) dep r29=r22,r29,21,1 // I0 update ipsr.pp with psr.pp +(pLvSys)mov r16=r0 // A clear r16 for leave_syscall, no-op otherwise + ;; + MOV_TO_IPSR(p0, r29, r25) // M2 + mov ar.pfs=r26 // I0 +(pLvSys)mov r17=r0 // A clear r17 for leave_syscall, no-op otherwise + + MOV_TO_IFS(p9, r30, r25)// M2 + mov b0=r21 // I0 +(pLvSys)mov r18=r0 // A clear r18 for leave_syscall, no-op otherwise + + mov ar.fpsr=r20 // M2 + MOV_TO_IIP(r28, r25) // M2 + nop 0 + ;; +(pUStk) mov ar.rnat=r24 // M2 must happen with RSE in lazy mode + nop 0 +(pLvSys)mov r2=r0 + + mov ar.rsc=r27 // M2 + mov pr=r31,-1 // I0 + RFI // B + + /* + * On entry: + * r20 = ¤t->thread_info->pre_count (if CONFIG_PREEMPT) + * r31 = current->thread_info->flags + * On exit: + * p6 = TRUE if work-pending-check needs to be redone + * + * Interrupts are disabled on entry, reenabled depend on work, and + * disabled on exit. + */ +.work_pending_syscall: + add r2=-8,r2 + add r3=-8,r3 + ;; + st8 [r2]=r8 + st8 [r3]=r10 +.work_pending: + tbit.z p6,p0=r31,TIF_NEED_RESCHED // is resched not needed? +(p6) br.cond.sptk.few .notify + br.call.spnt.many rp=preempt_schedule_irq +.ret9: cmp.eq p6,p0=r0,r0 // p6 <- 1 (re-check) +(pLvSys)br.cond.sptk.few __paravirt_pending_syscall_end + br.cond.sptk.many .work_processed_kernel + +.notify: +(pUStk) br.call.spnt.many rp=notify_resume_user +.ret10: cmp.ne p6,p0=r0,r0 // p6 <- 0 (don't re-check) +(pLvSys)br.cond.sptk.few __paravirt_pending_syscall_end + br.cond.sptk.many .work_processed_kernel + +.global __paravirt_pending_syscall_end; +__paravirt_pending_syscall_end: + adds r2=PT(R8)+16,r12 + adds r3=PT(R10)+16,r12 + ;; + ld8 r8=[r2] + ld8 r10=[r3] + br.cond.sptk.many __paravirt_work_processed_syscall_target +END(__paravirt_leave_kernel) + +#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE +ENTRY(handle_syscall_error) + /* + * Some system calls (e.g., ptrace, mmap) can return arbitrary values which could + * lead us to mistake a negative return value as a failed syscall. Those syscall + * must deposit a non-zero value in pt_regs.r8 to indicate an error. If + * pt_regs.r8 is zero, we assume that the call completed successfully. + */ + PT_REGS_UNWIND_INFO(0) + ld8 r3=[r2] // load pt_regs.r8 + ;; + cmp.eq p6,p7=r3,r0 // is pt_regs.r8==0? + ;; +(p7) mov r10=-1 +(p7) sub r8=0,r8 // negate return value to get errno + br.cond.sptk ia64_leave_syscall +END(handle_syscall_error) + + /* + * Invoke schedule_tail(task) while preserving in0-in7, which may be needed + * in case a system call gets restarted. + */ +GLOBAL_ENTRY(ia64_invoke_schedule_tail) + .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8) + alloc loc1=ar.pfs,8,2,1,0 + mov loc0=rp + mov out0=r8 // Address of previous task + ;; + br.call.sptk.many rp=schedule_tail +.ret11: mov ar.pfs=loc1 + mov rp=loc0 + br.ret.sptk.many rp +END(ia64_invoke_schedule_tail) + + /* + * Setup stack and call do_notify_resume_user(), keeping interrupts + * disabled. + * + * Note that pSys and pNonSys need to be set up by the caller. + * We declare 8 input registers so the system call args get preserved, + * in case we need to restart a system call. + */ +GLOBAL_ENTRY(notify_resume_user) + .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8) + alloc loc1=ar.pfs,8,2,3,0 // preserve all eight input regs in case of syscall restart! + mov r9=ar.unat + mov loc0=rp // save return address + mov out0=0 // there is no "oldset" + adds out1=8,sp // out1=&sigscratch->ar_pfs +(pSys) mov out2=1 // out2==1 => we're in a syscall + ;; +(pNonSys) mov out2=0 // out2==0 => not a syscall + .fframe 16 + .spillsp ar.unat, 16 + st8 [sp]=r9,-16 // allocate space for ar.unat and save it + st8 [out1]=loc1,-8 // save ar.pfs, out1=&sigscratch + .body + br.call.sptk.many rp=do_notify_resume_user +.ret15: .restore sp + adds sp=16,sp // pop scratch stack space + ;; + ld8 r9=[sp] // load new unat from sigscratch->scratch_unat + mov rp=loc0 + ;; + mov ar.unat=r9 + mov ar.pfs=loc1 + br.ret.sptk.many rp +END(notify_resume_user) + +ENTRY(sys_rt_sigreturn) + PT_REGS_UNWIND_INFO(0) + /* + * Allocate 8 input registers since ptrace() may clobber them + */ + alloc r2=ar.pfs,8,0,1,0 + .prologue + PT_REGS_SAVES(16) + adds sp=-16,sp + .body + cmp.eq pNonSys,pSys=r0,r0 // sigreturn isn't a normal syscall... + ;; + /* + * leave_kernel() restores f6-f11 from pt_regs, but since the streamlined + * syscall-entry path does not save them we save them here instead. Note: we + * don't need to save any other registers that are not saved by the stream-lined + * syscall path, because restore_sigcontext() restores them. + */ + adds r16=PT(F6)+32,sp + adds r17=PT(F7)+32,sp + ;; + stf.spill [r16]=f6,32 + stf.spill [r17]=f7,32 + ;; + stf.spill [r16]=f8,32 + stf.spill [r17]=f9,32 + ;; + stf.spill [r16]=f10 + stf.spill [r17]=f11 + adds out0=16,sp // out0 = &sigscratch + br.call.sptk.many rp=ia64_rt_sigreturn +.ret19: .restore sp,0 + adds sp=16,sp + ;; + ld8 r9=[sp] // load new ar.unat + mov.sptk b7=r8,ia64_native_leave_kernel + ;; + mov ar.unat=r9 + br.many b7 +END(sys_rt_sigreturn) + +GLOBAL_ENTRY(ia64_prepare_handle_unaligned) + .prologue + /* + * r16 = fake ar.pfs, we simply need to make sure privilege is still 0 + */ + mov r16=r0 + DO_SAVE_SWITCH_STACK + br.call.sptk.many rp=ia64_handle_unaligned // stack frame setup in ivt +.ret21: .body + DO_LOAD_SWITCH_STACK + br.cond.sptk.many rp // goes to ia64_leave_kernel +END(ia64_prepare_handle_unaligned) + + // + // unw_init_running(void (*callback)(info, arg), void *arg) + // +# define EXTRA_FRAME_SIZE ((UNW_FRAME_INFO_SIZE+15)&~15) + +GLOBAL_ENTRY(unw_init_running) + .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2) + alloc loc1=ar.pfs,2,3,3,0 + ;; + ld8 loc2=[in0],8 + mov loc0=rp + mov r16=loc1 + DO_SAVE_SWITCH_STACK + .body + + .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2) + .fframe IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE + SWITCH_STACK_SAVES(EXTRA_FRAME_SIZE) + adds sp=-EXTRA_FRAME_SIZE,sp + .body + ;; + adds out0=16,sp // &info + mov out1=r13 // current + adds out2=16+EXTRA_FRAME_SIZE,sp // &switch_stack + br.call.sptk.many rp=unw_init_frame_info +1: adds out0=16,sp // &info + mov b6=loc2 + mov loc2=gp // save gp across indirect function call + ;; + ld8 gp=[in0] + mov out1=in1 // arg + br.call.sptk.many rp=b6 // invoke the callback function +1: mov gp=loc2 // restore gp + + // For now, we don't allow changing registers from within + // unw_init_running; if we ever want to allow that, we'd + // have to do a load_switch_stack here: + .restore sp + adds sp=IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE,sp + + mov ar.pfs=loc1 + mov rp=loc0 + br.ret.sptk.many rp +END(unw_init_running) + +#ifdef CONFIG_FUNCTION_TRACER +#ifdef CONFIG_DYNAMIC_FTRACE +GLOBAL_ENTRY(_mcount) + br ftrace_stub +END(_mcount) + +.here: + br.ret.sptk.many b0 + +GLOBAL_ENTRY(ftrace_caller) + alloc out0 = ar.pfs, 8, 0, 4, 0 + mov out3 = r0 + ;; + mov out2 = b0 + add r3 = 0x20, r3 + mov out1 = r1; + br.call.sptk.many b0 = ftrace_patch_gp + //this might be called from module, so we must patch gp +ftrace_patch_gp: + movl gp=__gp + mov b0 = r3 + ;; +.global ftrace_call; +ftrace_call: +{ + .mlx + nop.m 0x0 + movl r3 = .here;; +} + alloc loc0 = ar.pfs, 4, 4, 2, 0 + ;; + mov loc1 = b0 + mov out0 = b0 + mov loc2 = r8 + mov loc3 = r15 + ;; + adds out0 = -MCOUNT_INSN_SIZE, out0 + mov out1 = in2 + mov b6 = r3 + + br.call.sptk.many b0 = b6 + ;; + mov ar.pfs = loc0 + mov b0 = loc1 + mov r8 = loc2 + mov r15 = loc3 + br ftrace_stub + ;; +END(ftrace_caller) + +#else +GLOBAL_ENTRY(_mcount) + movl r2 = ftrace_stub + movl r3 = ftrace_trace_function;; + ld8 r3 = [r3];; + ld8 r3 = [r3];; + cmp.eq p7,p0 = r2, r3 +(p7) br.sptk.many ftrace_stub + ;; + + alloc loc0 = ar.pfs, 4, 4, 2, 0 + ;; + mov loc1 = b0 + mov out0 = b0 + mov loc2 = r8 + mov loc3 = r15 + ;; + adds out0 = -MCOUNT_INSN_SIZE, out0 + mov out1 = in2 + mov b6 = r3 + + br.call.sptk.many b0 = b6 + ;; + mov ar.pfs = loc0 + mov b0 = loc1 + mov r8 = loc2 + mov r15 = loc3 + br ftrace_stub + ;; +END(_mcount) +#endif + +GLOBAL_ENTRY(ftrace_stub) + mov r3 = b0 + movl r2 = _mcount_ret_helper + ;; + mov b6 = r2 + mov b7 = r3 + br.ret.sptk.many b6 + +_mcount_ret_helper: + mov b0 = r42 + mov r1 = r41 + mov ar.pfs = r40 + br b7 +END(ftrace_stub) + +#endif /* CONFIG_FUNCTION_TRACER */ + + .rodata + .align 8 + .globl sys_call_table +sys_call_table: + data8 sys_ni_syscall // This must be sys_ni_syscall! See ivt.S. + data8 sys_exit // 1025 + data8 sys_read + data8 sys_write + data8 sys_open + data8 sys_close + data8 sys_creat // 1030 + data8 sys_link + data8 sys_unlink + data8 ia64_execve + data8 sys_chdir + data8 sys_fchdir // 1035 + data8 sys_utimes + data8 sys_mknod + data8 sys_chmod + data8 sys_chown + data8 sys_lseek // 1040 + data8 sys_getpid + data8 sys_getppid + data8 sys_mount + data8 sys_umount + data8 sys_setuid // 1045 + data8 sys_getuid + data8 sys_geteuid + data8 sys_ptrace + data8 sys_access + data8 sys_sync // 1050 + data8 sys_fsync + data8 sys_fdatasync + data8 sys_kill + data8 sys_rename + data8 sys_mkdir // 1055 + data8 sys_rmdir + data8 sys_dup + data8 sys_ia64_pipe + data8 sys_times + data8 ia64_brk // 1060 + data8 sys_setgid + data8 sys_getgid + data8 sys_getegid + data8 sys_acct + data8 sys_ioctl // 1065 + data8 sys_fcntl + data8 sys_umask + data8 sys_chroot + data8 sys_ustat + data8 sys_dup2 // 1070 + data8 sys_setreuid + data8 sys_setregid + data8 sys_getresuid + data8 sys_setresuid + data8 sys_getresgid // 1075 + data8 sys_setresgid + data8 sys_getgroups + data8 sys_setgroups + data8 sys_getpgid + data8 sys_setpgid // 1080 + data8 sys_setsid + data8 sys_getsid + data8 sys_sethostname + data8 sys_setrlimit + data8 sys_getrlimit // 1085 + data8 sys_getrusage + data8 sys_gettimeofday + data8 sys_settimeofday + data8 sys_select + data8 sys_poll // 1090 + data8 sys_symlink + data8 sys_readlink + data8 sys_uselib + data8 sys_swapon + data8 sys_swapoff // 1095 + data8 sys_reboot + data8 sys_truncate + data8 sys_ftruncate + data8 sys_fchmod + data8 sys_fchown // 1100 + data8 ia64_getpriority + data8 sys_setpriority + data8 sys_statfs + data8 sys_fstatfs + data8 sys_gettid // 1105 + data8 sys_semget + data8 sys_semop + data8 sys_semctl + data8 sys_msgget + data8 sys_msgsnd // 1110 + data8 sys_msgrcv + data8 sys_msgctl + data8 sys_shmget + data8 sys_shmat + data8 sys_shmdt // 1115 + data8 sys_shmctl + data8 sys_syslog + data8 sys_setitimer + data8 sys_getitimer + data8 sys_ni_syscall // 1120 /* was: ia64_oldstat */ + data8 sys_ni_syscall /* was: ia64_oldlstat */ + data8 sys_ni_syscall /* was: ia64_oldfstat */ + data8 sys_vhangup + data8 sys_lchown + data8 sys_remap_file_pages // 1125 + data8 sys_wait4 + data8 sys_sysinfo + data8 sys_clone + data8 sys_setdomainname + data8 sys_newuname // 1130 + data8 sys_adjtimex + data8 sys_ni_syscall /* was: ia64_create_module */ + data8 sys_init_module + data8 sys_delete_module + data8 sys_ni_syscall // 1135 /* was: sys_get_kernel_syms */ + data8 sys_ni_syscall /* was: sys_query_module */ + data8 sys_quotactl + data8 sys_bdflush + data8 sys_sysfs + data8 sys_personality // 1140 + data8 sys_ni_syscall // sys_afs_syscall + data8 sys_setfsuid + data8 sys_setfsgid + data8 sys_getdents + data8 sys_flock // 1145 + data8 sys_readv + data8 sys_writev + data8 sys_pread64 + data8 sys_pwrite64 + data8 sys_sysctl // 1150 + data8 sys_mmap + data8 sys_munmap + data8 sys_mlock + data8 sys_mlockall + data8 sys_mprotect // 1155 + data8 ia64_mremap + data8 sys_msync + data8 sys_munlock + data8 sys_munlockall + data8 sys_sched_getparam // 1160 + data8 sys_sched_setparam + data8 sys_sched_getscheduler + data8 sys_sched_setscheduler + data8 sys_sched_yield + data8 sys_sched_get_priority_max // 1165 + data8 sys_sched_get_priority_min + data8 sys_sched_rr_get_interval + data8 sys_nanosleep + data8 sys_ni_syscall // old nfsservctl + data8 sys_prctl // 1170 + data8 sys_getpagesize + data8 sys_mmap2 + data8 sys_pciconfig_read + data8 sys_pciconfig_write + data8 sys_perfmonctl // 1175 + data8 sys_sigaltstack + data8 sys_rt_sigaction + data8 sys_rt_sigpending + data8 sys_rt_sigprocmask + data8 sys_rt_sigqueueinfo // 1180 + data8 sys_rt_sigreturn + data8 sys_rt_sigsuspend + data8 sys_rt_sigtimedwait + data8 sys_getcwd + data8 sys_capget // 1185 + data8 sys_capset + data8 sys_sendfile64 + data8 sys_ni_syscall // sys_getpmsg (STREAMS) + data8 sys_ni_syscall // sys_putpmsg (STREAMS) + data8 sys_socket // 1190 + data8 sys_bind + data8 sys_connect + data8 sys_listen + data8 sys_accept + data8 sys_getsockname // 1195 + data8 sys_getpeername + data8 sys_socketpair + data8 sys_send + data8 sys_sendto + data8 sys_recv // 1200 + data8 sys_recvfrom + data8 sys_shutdown + data8 sys_setsockopt + data8 sys_getsockopt + data8 sys_sendmsg // 1205 + data8 sys_recvmsg + data8 sys_pivot_root + data8 sys_mincore + data8 sys_madvise + data8 sys_newstat // 1210 + data8 sys_newlstat + data8 sys_newfstat + data8 sys_clone2 + data8 sys_getdents64 + data8 sys_getunwind // 1215 + data8 sys_readahead + data8 sys_setxattr + data8 sys_lsetxattr + data8 sys_fsetxattr + data8 sys_getxattr // 1220 + data8 sys_lgetxattr + data8 sys_fgetxattr + data8 sys_listxattr + data8 sys_llistxattr + data8 sys_flistxattr // 1225 + data8 sys_removexattr + data8 sys_lremovexattr + data8 sys_fremovexattr + data8 sys_tkill + data8 sys_futex // 1230 + data8 sys_sched_setaffinity + data8 sys_sched_getaffinity + data8 sys_set_tid_address + data8 sys_fadvise64_64 + data8 sys_tgkill // 1235 + data8 sys_exit_group + data8 sys_lookup_dcookie + data8 sys_io_setup + data8 sys_io_destroy + data8 sys_io_getevents // 1240 + data8 sys_io_submit + data8 sys_io_cancel + data8 sys_epoll_create + data8 sys_epoll_ctl + data8 sys_epoll_wait // 1245 + data8 sys_restart_syscall + data8 sys_semtimedop + data8 sys_timer_create + data8 sys_timer_settime + data8 sys_timer_gettime // 1250 + data8 sys_timer_getoverrun + data8 sys_timer_delete + data8 sys_clock_settime + data8 sys_clock_gettime + data8 sys_clock_getres // 1255 + data8 sys_clock_nanosleep + data8 sys_fstatfs64 + data8 sys_statfs64 + data8 sys_mbind + data8 sys_get_mempolicy // 1260 + data8 sys_set_mempolicy + data8 sys_mq_open + data8 sys_mq_unlink + data8 sys_mq_timedsend + data8 sys_mq_timedreceive // 1265 + data8 sys_mq_notify + data8 sys_mq_getsetattr + data8 sys_kexec_load + data8 sys_ni_syscall // reserved for vserver + data8 sys_waitid // 1270 + data8 sys_add_key + data8 sys_request_key + data8 sys_keyctl + data8 sys_ioprio_set + data8 sys_ioprio_get // 1275 + data8 sys_move_pages + data8 sys_inotify_init + data8 sys_inotify_add_watch + data8 sys_inotify_rm_watch + data8 sys_migrate_pages // 1280 + data8 sys_openat + data8 sys_mkdirat + data8 sys_mknodat + data8 sys_fchownat + data8 sys_futimesat // 1285 + data8 sys_newfstatat + data8 sys_unlinkat + data8 sys_renameat + data8 sys_linkat + data8 sys_symlinkat // 1290 + data8 sys_readlinkat + data8 sys_fchmodat + data8 sys_faccessat + data8 sys_pselect6 + data8 sys_ppoll // 1295 + data8 sys_unshare + data8 sys_splice + data8 sys_set_robust_list + data8 sys_get_robust_list + data8 sys_sync_file_range // 1300 + data8 sys_tee + data8 sys_vmsplice + data8 sys_fallocate + data8 sys_getcpu + data8 sys_epoll_pwait // 1305 + data8 sys_utimensat + data8 sys_signalfd + data8 sys_ni_syscall + data8 sys_eventfd + data8 sys_timerfd_create // 1310 + data8 sys_timerfd_settime + data8 sys_timerfd_gettime + data8 sys_signalfd4 + data8 sys_eventfd2 + data8 sys_epoll_create1 // 1315 + data8 sys_dup3 + data8 sys_pipe2 + data8 sys_inotify_init1 + data8 sys_preadv + data8 sys_pwritev // 1320 + data8 sys_rt_tgsigqueueinfo + data8 sys_recvmmsg + data8 sys_fanotify_init + data8 sys_fanotify_mark + data8 sys_prlimit64 // 1325 + data8 sys_name_to_handle_at + data8 sys_open_by_handle_at + data8 sys_clock_adjtime + data8 sys_syncfs + data8 sys_setns // 1330 + data8 sys_sendmmsg + data8 sys_process_vm_readv + data8 sys_process_vm_writev + data8 sys_accept4 + data8 sys_finit_module // 1335 + data8 sys_sched_setattr + data8 sys_sched_getattr + data8 sys_renameat2 + data8 sys_getrandom + data8 sys_memfd_create // 1340 + data8 sys_bpf + data8 sys_execveat + + .org sys_call_table + 8*NR_syscalls // guard against failures to increase NR_syscalls +#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */ -- cgit v1.2.3-54-g00ecf