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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This file contains the light-weight system call handlers (fsyscall-handlers).
+ *
+ * Copyright (C) 2003 Hewlett-Packard Co
+ * David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * 25-Sep-03 davidm Implement fsys_rt_sigprocmask().
+ * 18-Feb-03 louisk Implement fsys_gettimeofday().
+ * 28-Feb-03 davidm Fixed several bugs in fsys_gettimeofday(). Tuned it some more,
+ * probably broke it along the way... ;-)
+ * 13-Jul-04 clameter Implement fsys_clock_gettime and revise fsys_gettimeofday to make
+ * it capable of using memory based clocks without falling back to C code.
+ * 08-Feb-07 Fenghua Yu Implement fsys_getcpu.
+ *
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/errno.h>
+#include <asm/asm-offsets.h>
+#include <asm/percpu.h>
+#include <asm/thread_info.h>
+#include <asm/sal.h>
+#include <asm/signal.h>
+#include <asm/unistd.h>
+
+#include "entry.h"
+#include <asm/native/inst.h>
+
+/*
+ * See Documentation/arch/ia64/fsys.rst for details on fsyscalls.
+ *
+ * On entry to an fsyscall handler:
+ * r10 = 0 (i.e., defaults to "successful syscall return")
+ * r11 = saved ar.pfs (a user-level value)
+ * r15 = system call number
+ * r16 = "current" task pointer (in normal kernel-mode, this is in r13)
+ * r32-r39 = system call arguments
+ * b6 = return address (a user-level value)
+ * ar.pfs = previous frame-state (a user-level value)
+ * PSR.be = cleared to zero (i.e., little-endian byte order is in effect)
+ * all other registers may contain values passed in from user-mode
+ *
+ * On return from an fsyscall handler:
+ * r11 = saved ar.pfs (as passed into the fsyscall handler)
+ * r15 = system call number (as passed into the fsyscall handler)
+ * r32-r39 = system call arguments (as passed into the fsyscall handler)
+ * b6 = return address (as passed into the fsyscall handler)
+ * ar.pfs = previous frame-state (as passed into the fsyscall handler)
+ */
+
+ENTRY(fsys_ni_syscall)
+ .prologue
+ .altrp b6
+ .body
+ mov r8=ENOSYS
+ mov r10=-1
+ FSYS_RETURN
+END(fsys_ni_syscall)
+
+ENTRY(fsys_getpid)
+ .prologue
+ .altrp b6
+ .body
+ add r17=IA64_TASK_SIGNAL_OFFSET,r16
+ ;;
+ ld8 r17=[r17] // r17 = current->signal
+ add r9=TI_FLAGS+IA64_TASK_SIZE,r16
+ ;;
+ ld4 r9=[r9]
+ add r17=IA64_SIGNAL_PIDS_TGID_OFFSET,r17
+ ;;
+ and r9=TIF_ALLWORK_MASK,r9
+ ld8 r17=[r17] // r17 = current->signal->pids[PIDTYPE_TGID]
+ ;;
+ add r8=IA64_PID_LEVEL_OFFSET,r17
+ ;;
+ ld4 r8=[r8] // r8 = pid->level
+ add r17=IA64_PID_UPID_OFFSET,r17 // r17 = &pid->numbers[0]
+ ;;
+ shl r8=r8,IA64_UPID_SHIFT
+ ;;
+ add r17=r17,r8 // r17 = &pid->numbers[pid->level]
+ ;;
+ ld4 r8=[r17] // r8 = pid->numbers[pid->level].nr
+ ;;
+ mov r17=0
+ ;;
+ cmp.ne p8,p0=0,r9
+(p8) br.spnt.many fsys_fallback_syscall
+ FSYS_RETURN
+END(fsys_getpid)
+
+ENTRY(fsys_set_tid_address)
+ .prologue
+ .altrp b6
+ .body
+ add r9=TI_FLAGS+IA64_TASK_SIZE,r16
+ add r17=IA64_TASK_THREAD_PID_OFFSET,r16
+ ;;
+ ld4 r9=[r9]
+ tnat.z p6,p7=r32 // check argument register for being NaT
+ ld8 r17=[r17] // r17 = current->thread_pid
+ ;;
+ and r9=TIF_ALLWORK_MASK,r9
+ add r8=IA64_PID_LEVEL_OFFSET,r17
+ add r18=IA64_TASK_CLEAR_CHILD_TID_OFFSET,r16
+ ;;
+ ld4 r8=[r8] // r8 = pid->level
+ add r17=IA64_PID_UPID_OFFSET,r17 // r17 = &pid->numbers[0]
+ ;;
+ shl r8=r8,IA64_UPID_SHIFT
+ ;;
+ add r17=r17,r8 // r17 = &pid->numbers[pid->level]
+ ;;
+ ld4 r8=[r17] // r8 = pid->numbers[pid->level].nr
+ ;;
+ cmp.ne p8,p0=0,r9
+ mov r17=-1
+ ;;
+(p6) st8 [r18]=r32
+(p7) st8 [r18]=r17
+(p8) br.spnt.many fsys_fallback_syscall
+ ;;
+ mov r17=0 // i must not leak kernel bits...
+ mov r18=0 // i must not leak kernel bits...
+ FSYS_RETURN
+END(fsys_set_tid_address)
+
+#if IA64_GTOD_SEQ_OFFSET !=0
+#error fsys_gettimeofday incompatible with changes to struct fsyscall_gtod_data_t
+#endif
+#if IA64_ITC_JITTER_OFFSET !=0
+#error fsys_gettimeofday incompatible with changes to struct itc_jitter_data_t
+#endif
+#define CLOCK_REALTIME 0
+#define CLOCK_MONOTONIC 1
+#define CLOCK_DIVIDE_BY_1000 0x4000
+#define CLOCK_ADD_MONOTONIC 0x8000
+
+ENTRY(fsys_gettimeofday)
+ .prologue
+ .altrp b6
+ .body
+ mov r31 = r32
+ tnat.nz p6,p0 = r33 // guard against NaT argument
+(p6) br.cond.spnt.few .fail_einval
+ mov r30 = CLOCK_DIVIDE_BY_1000
+ ;;
+.gettime:
+ // Register map
+ // Incoming r31 = pointer to address where to place result
+ // r30 = flags determining how time is processed
+ // r2,r3 = temp r4-r7 preserved
+ // r8 = result nanoseconds
+ // r9 = result seconds
+ // r10 = temporary storage for clock difference
+ // r11 = preserved: saved ar.pfs
+ // r12 = preserved: memory stack
+ // r13 = preserved: thread pointer
+ // r14 = address of mask / mask value
+ // r15 = preserved: system call number
+ // r16 = preserved: current task pointer
+ // r17 = (not used)
+ // r18 = (not used)
+ // r19 = address of itc_lastcycle
+ // r20 = struct fsyscall_gtod_data (= address of gtod_lock.sequence)
+ // r21 = address of mmio_ptr
+ // r22 = address of wall_time or monotonic_time
+ // r23 = address of shift / value
+ // r24 = address mult factor / cycle_last value
+ // r25 = itc_lastcycle value
+ // r26 = address clocksource cycle_last
+ // r27 = (not used)
+ // r28 = sequence number at the beginning of critical section
+ // r29 = address of itc_jitter
+ // r30 = time processing flags / memory address
+ // r31 = pointer to result
+ // Predicates
+ // p6,p7 short term use
+ // p8 = timesource ar.itc
+ // p9 = timesource mmio64
+ // p10 = timesource mmio32 - not used
+ // p11 = timesource not to be handled by asm code
+ // p12 = memory time source ( = p9 | p10) - not used
+ // p13 = do cmpxchg with itc_lastcycle
+ // p14 = Divide by 1000
+ // p15 = Add monotonic
+ //
+ // Note that instructions are optimized for McKinley. McKinley can
+ // process two bundles simultaneously and therefore we continuously
+ // try to feed the CPU two bundles and then a stop.
+
+ add r2 = TI_FLAGS+IA64_TASK_SIZE,r16
+ tnat.nz p6,p0 = r31 // guard against Nat argument
+(p6) br.cond.spnt.few .fail_einval
+ movl r20 = fsyscall_gtod_data // load fsyscall gettimeofday data address
+ ;;
+ ld4 r2 = [r2] // process work pending flags
+ movl r29 = itc_jitter_data // itc_jitter
+ add r22 = IA64_GTOD_WALL_TIME_OFFSET,r20 // wall_time
+ add r21 = IA64_CLKSRC_MMIO_OFFSET,r20
+ mov pr = r30,0xc000 // Set predicates according to function
+ ;;
+ and r2 = TIF_ALLWORK_MASK,r2
+ add r19 = IA64_ITC_LASTCYCLE_OFFSET,r29
+(p15) add r22 = IA64_GTOD_MONO_TIME_OFFSET,r20 // monotonic_time
+ ;;
+ add r26 = IA64_CLKSRC_CYCLE_LAST_OFFSET,r20 // clksrc_cycle_last
+ cmp.ne p6, p0 = 0, r2 // Fallback if work is scheduled
+(p6) br.cond.spnt.many fsys_fallback_syscall
+ ;;
+ // Begin critical section
+.time_redo:
+ ld4.acq r28 = [r20] // gtod_lock.sequence, Must take first
+ ;;
+ and r28 = ~1,r28 // And make sequence even to force retry if odd
+ ;;
+ ld8 r30 = [r21] // clocksource->mmio_ptr
+ add r24 = IA64_CLKSRC_MULT_OFFSET,r20
+ ld4 r2 = [r29] // itc_jitter value
+ add r23 = IA64_CLKSRC_SHIFT_OFFSET,r20
+ add r14 = IA64_CLKSRC_MASK_OFFSET,r20
+ ;;
+ ld4 r3 = [r24] // clocksource mult value
+ ld8 r14 = [r14] // clocksource mask value
+ cmp.eq p8,p9 = 0,r30 // use cpu timer if no mmio_ptr
+ ;;
+ setf.sig f7 = r3 // Setup for mult scaling of counter
+(p8) cmp.ne p13,p0 = r2,r0 // need itc_jitter compensation, set p13
+ ld4 r23 = [r23] // clocksource shift value
+ ld8 r24 = [r26] // get clksrc_cycle_last value
+(p9) cmp.eq p13,p0 = 0,r30 // if mmio_ptr, clear p13 jitter control
+ ;;
+ .pred.rel.mutex p8,p9
+ MOV_FROM_ITC(p8, p6, r2, r10) // CPU_TIMER. 36 clocks latency!!!
+(p9) ld8 r2 = [r30] // MMIO_TIMER. Could also have latency issues..
+(p13) ld8 r25 = [r19] // get itc_lastcycle value
+ ld8 r9 = [r22],IA64_TIME_SN_SPEC_SNSEC_OFFSET // sec
+ ;;
+ ld8 r8 = [r22],-IA64_TIME_SN_SPEC_SNSEC_OFFSET // snsec
+(p13) sub r3 = r25,r2 // Diff needed before comparison (thanks davidm)
+ ;;
+(p13) cmp.gt.unc p6,p7 = r3,r0 // check if it is less than last. p6,p7 cleared
+ sub r10 = r2,r24 // current_cycle - last_cycle
+ ;;
+(p6) sub r10 = r25,r24 // time we got was less than last_cycle
+(p7) mov ar.ccv = r25 // more than last_cycle. Prep for cmpxchg
+ ;;
+(p7) cmpxchg8.rel r3 = [r19],r2,ar.ccv
+ ;;
+(p7) cmp.ne p7,p0 = r25,r3 // if cmpxchg not successful
+ ;;
+(p7) sub r10 = r3,r24 // then use new last_cycle instead
+ ;;
+ and r10 = r10,r14 // Apply mask
+ ;;
+ setf.sig f8 = r10
+ nop.i 123
+ ;;
+ // fault check takes 5 cycles and we have spare time
+EX(.fail_efault, probe.w.fault r31, 3)
+ xmpy.l f8 = f8,f7 // nsec_per_cyc*(counter-last_counter)
+ ;;
+ getf.sig r2 = f8
+ mf
+ ;;
+ ld4 r10 = [r20] // gtod_lock.sequence
+ add r8 = r8,r2 // Add xtime.nsecs
+ ;;
+ shr.u r8 = r8,r23 // shift by factor
+ cmp4.ne p7,p0 = r28,r10
+(p7) br.cond.dpnt.few .time_redo // sequence number changed, redo
+ // End critical section.
+ // Now r8=tv->tv_nsec and r9=tv->tv_sec
+ mov r10 = r0
+ movl r2 = 1000000000
+ add r23 = IA64_TIMESPEC_TV_NSEC_OFFSET, r31
+(p14) movl r3 = 2361183241434822607 // Prep for / 1000 hack
+ ;;
+.time_normalize:
+ mov r21 = r8
+ cmp.ge p6,p0 = r8,r2
+(p14) shr.u r20 = r8, 3 // We can repeat this if necessary just wasting time
+ ;;
+(p14) setf.sig f8 = r20
+(p6) sub r8 = r8,r2
+(p6) add r9 = 1,r9 // two nops before the branch.
+(p14) setf.sig f7 = r3 // Chances for repeats are 1 in 10000 for gettod
+(p6) br.cond.dpnt.few .time_normalize
+ ;;
+ // Divided by 8 though shift. Now divide by 125
+ // The compiler was able to do that with a multiply
+ // and a shift and we do the same
+EX(.fail_efault, probe.w.fault r23, 3) // This also costs 5 cycles
+(p14) xmpy.hu f8 = f8, f7 // xmpy has 5 cycles latency so use it
+ ;;
+(p14) getf.sig r2 = f8
+ ;;
+ mov r8 = r0
+(p14) shr.u r21 = r2, 4
+ ;;
+EX(.fail_efault, st8 [r31] = r9)
+EX(.fail_efault, st8 [r23] = r21)
+ FSYS_RETURN
+.fail_einval:
+ mov r8 = EINVAL
+ mov r10 = -1
+ FSYS_RETURN
+.fail_efault:
+ mov r8 = EFAULT
+ mov r10 = -1
+ FSYS_RETURN
+END(fsys_gettimeofday)
+
+ENTRY(fsys_clock_gettime)
+ .prologue
+ .altrp b6
+ .body
+ cmp4.ltu p6, p0 = CLOCK_MONOTONIC, r32
+ // Fallback if this is not CLOCK_REALTIME or CLOCK_MONOTONIC
+(p6) br.spnt.few fsys_fallback_syscall
+ mov r31 = r33
+ shl r30 = r32,15
+ br.many .gettime
+END(fsys_clock_gettime)
+
+/*
+ * fsys_getcpu doesn't use the third parameter in this implementation. It reads
+ * current_thread_info()->cpu and corresponding node in cpu_to_node_map.
+ */
+ENTRY(fsys_getcpu)
+ .prologue
+ .altrp b6
+ .body
+ ;;
+ add r2=TI_FLAGS+IA64_TASK_SIZE,r16
+ tnat.nz p6,p0 = r32 // guard against NaT argument
+ add r3=TI_CPU+IA64_TASK_SIZE,r16
+ ;;
+ ld4 r3=[r3] // M r3 = thread_info->cpu
+ ld4 r2=[r2] // M r2 = thread_info->flags
+(p6) br.cond.spnt.few .fail_einval // B
+ ;;
+ tnat.nz p7,p0 = r33 // I guard against NaT argument
+(p7) br.cond.spnt.few .fail_einval // B
+ ;;
+ cmp.ne p6,p0=r32,r0
+ cmp.ne p7,p0=r33,r0
+ ;;
+#ifdef CONFIG_NUMA
+ movl r17=cpu_to_node_map
+ ;;
+EX(.fail_efault, (p6) probe.w.fault r32, 3) // M This takes 5 cycles
+EX(.fail_efault, (p7) probe.w.fault r33, 3) // M This takes 5 cycles
+ shladd r18=r3,1,r17
+ ;;
+ ld2 r20=[r18] // r20 = cpu_to_node_map[cpu]
+ and r2 = TIF_ALLWORK_MASK,r2
+ ;;
+ cmp.ne p8,p0=0,r2
+(p8) br.spnt.many fsys_fallback_syscall
+ ;;
+ ;;
+EX(.fail_efault, (p6) st4 [r32] = r3)
+EX(.fail_efault, (p7) st2 [r33] = r20)
+ mov r8=0
+ ;;
+#else
+EX(.fail_efault, (p6) probe.w.fault r32, 3) // M This takes 5 cycles
+EX(.fail_efault, (p7) probe.w.fault r33, 3) // M This takes 5 cycles
+ and r2 = TIF_ALLWORK_MASK,r2
+ ;;
+ cmp.ne p8,p0=0,r2
+(p8) br.spnt.many fsys_fallback_syscall
+ ;;
+EX(.fail_efault, (p6) st4 [r32] = r3)
+EX(.fail_efault, (p7) st2 [r33] = r0)
+ mov r8=0
+ ;;
+#endif
+ FSYS_RETURN
+END(fsys_getcpu)
+
+ENTRY(fsys_fallback_syscall)
+ .prologue
+ .altrp b6
+ .body
+ /*
+ * We only get here from light-weight syscall handlers. Thus, we already
+ * know that r15 contains a valid syscall number. No need to re-check.
+ */
+ adds r17=-1024,r15
+ movl r14=sys_call_table
+ ;;
+ RSM_PSR_I(p0, r26, r27)
+ shladd r18=r17,3,r14
+ ;;
+ ld8 r18=[r18] // load normal (heavy-weight) syscall entry-point
+ MOV_FROM_PSR(p0, r29, r26) // read psr (12 cyc load latency)
+ mov r27=ar.rsc
+ mov r21=ar.fpsr
+ mov r26=ar.pfs
+END(fsys_fallback_syscall)
+ /* FALL THROUGH */
+GLOBAL_ENTRY(fsys_bubble_down)
+ .prologue
+ .altrp b6
+ .body
+ /*
+ * We get here for syscalls that don't have a lightweight
+ * handler. For those, we need to bubble down into the kernel
+ * and that requires setting up a minimal pt_regs structure,
+ * and initializing the CPU state more or less as if an
+ * interruption had occurred. To make syscall-restarts work,
+ * we setup pt_regs such that cr_iip points to the second
+ * instruction in syscall_via_break. Decrementing the IP
+ * hence will restart the syscall via break and not
+ * decrementing IP will return us to the caller, as usual.
+ * Note that we preserve the value of psr.pp rather than
+ * initializing it from dcr.pp. This makes it possible to
+ * distinguish fsyscall execution from other privileged
+ * execution.
+ *
+ * On entry:
+ * - normal fsyscall handler register usage, except
+ * that we also have:
+ * - r18: address of syscall entry point
+ * - r21: ar.fpsr
+ * - r26: ar.pfs
+ * - r27: ar.rsc
+ * - r29: psr
+ *
+ * We used to clear some PSR bits here but that requires slow
+ * serialization. Fortunately, that isn't really necessary.
+ * The rationale is as follows: we used to clear bits
+ * ~PSR_PRESERVED_BITS in PSR.L. Since
+ * PSR_PRESERVED_BITS==PSR.{UP,MFL,MFH,PK,DT,PP,SP,RT,IC}, we
+ * ended up clearing PSR.{BE,AC,I,DFL,DFH,DI,DB,SI,TB}.
+ * However,
+ *
+ * PSR.BE : already is turned off in __kernel_syscall_via_epc()
+ * PSR.AC : don't care (kernel normally turns PSR.AC on)
+ * PSR.I : already turned off by the time fsys_bubble_down gets
+ * invoked
+ * PSR.DFL: always 0 (kernel never turns it on)
+ * PSR.DFH: don't care --- kernel never touches f32-f127 on its own
+ * initiative
+ * PSR.DI : always 0 (kernel never turns it on)
+ * PSR.SI : always 0 (kernel never turns it on)
+ * PSR.DB : don't care --- kernel never enables kernel-level
+ * breakpoints
+ * PSR.TB : must be 0 already; if it wasn't zero on entry to
+ * __kernel_syscall_via_epc, the branch to fsys_bubble_down
+ * will trigger a taken branch; the taken-trap-handler then
+ * converts the syscall into a break-based system-call.
+ */
+ /*
+ * Reading psr.l gives us only bits 0-31, psr.it, and psr.mc.
+ * The rest we have to synthesize.
+ */
+# define PSR_ONE_BITS ((3 << IA64_PSR_CPL0_BIT) \
+ | (0x1 << IA64_PSR_RI_BIT) \
+ | IA64_PSR_BN | IA64_PSR_I)
+
+ invala // M0|1
+ movl r14=ia64_ret_from_syscall // X
+
+ nop.m 0
+ movl r28=__kernel_syscall_via_break // X create cr.iip
+ ;;
+
+ mov r2=r16 // A get task addr to addl-addressable register
+ adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16 // A
+ mov r31=pr // I0 save pr (2 cyc)
+ ;;
+ st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag
+ addl r22=IA64_RBS_OFFSET,r2 // A compute base of RBS
+ add r3=TI_FLAGS+IA64_TASK_SIZE,r2 // A
+ ;;
+ ld4 r3=[r3] // M0|1 r3 = current_thread_info()->flags
+ lfetch.fault.excl.nt1 [r22] // M0|1 prefetch register backing-store
+ nop.i 0
+ ;;
+ mov ar.rsc=0 // M2 set enforced lazy mode, pl 0, LE, loadrs=0
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+ MOV_FROM_ITC(p0, p6, r30, r23) // M get cycle for accounting
+#else
+ nop.m 0
+#endif
+ nop.i 0
+ ;;
+ mov r23=ar.bspstore // M2 (12 cyc) save ar.bspstore
+ mov.m r24=ar.rnat // M2 (5 cyc) read ar.rnat (dual-issues!)
+ nop.i 0
+ ;;
+ mov ar.bspstore=r22 // M2 (6 cyc) switch to kernel RBS
+ movl r8=PSR_ONE_BITS // X
+ ;;
+ mov r25=ar.unat // M2 (5 cyc) save ar.unat
+ mov r19=b6 // I0 save b6 (2 cyc)
+ mov r20=r1 // A save caller's gp in r20
+ ;;
+ or r29=r8,r29 // A construct cr.ipsr value to save
+ mov b6=r18 // I0 copy syscall entry-point to b6 (7 cyc)
+ addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2 // A compute base of memory stack
+
+ mov r18=ar.bsp // M2 save (kernel) ar.bsp (12 cyc)
+ cmp.ne pKStk,pUStk=r0,r0 // A set pKStk <- 0, pUStk <- 1
+ br.call.sptk.many b7=ia64_syscall_setup // B
+ ;;
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
+ // mov.m r30=ar.itc is called in advance
+ add r16=TI_AC_STAMP+IA64_TASK_SIZE,r2
+ add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r2
+ ;;
+ ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // time at last check in kernel
+ ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // time at leave kernel
+ ;;
+ ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME // cumulated stime
+ ld8 r21=[r17] // cumulated utime
+ sub r22=r19,r18 // stime before leave kernel
+ ;;
+ st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP // update stamp
+ sub r18=r30,r19 // elapsed time in user mode
+ ;;
+ add r20=r20,r22 // sum stime
+ add r21=r21,r18 // sum utime
+ ;;
+ st8 [r16]=r20 // update stime
+ st8 [r17]=r21 // update utime
+ ;;
+#endif
+ mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0
+ mov rp=r14 // I0 set the real return addr
+ and r3=_TIF_SYSCALL_TRACEAUDIT,r3 // A
+ ;;
+ SSM_PSR_I(p0, p6, r22) // M2 we're on kernel stacks now, reenable irqs
+ cmp.eq p8,p0=r3,r0 // A
+(p10) br.cond.spnt.many ia64_ret_from_syscall // B return if bad call-frame or r15 is a NaT
+
+ nop.m 0
+(p8) br.call.sptk.many b6=b6 // B (ignore return address)
+ br.cond.spnt ia64_trace_syscall // B
+END(fsys_bubble_down)
+
+ .rodata
+ .align 8
+ .globl fsyscall_table
+
+ data8 fsys_bubble_down
+fsyscall_table:
+ data8 fsys_ni_syscall
+ data8 0 // exit // 1025
+ data8 0 // read
+ data8 0 // write
+ data8 0 // open
+ data8 0 // close
+ data8 0 // creat // 1030
+ data8 0 // link
+ data8 0 // unlink
+ data8 0 // execve
+ data8 0 // chdir
+ data8 0 // fchdir // 1035
+ data8 0 // utimes
+ data8 0 // mknod
+ data8 0 // chmod
+ data8 0 // chown
+ data8 0 // lseek // 1040
+ data8 fsys_getpid // getpid
+ data8 0 // getppid
+ data8 0 // mount
+ data8 0 // umount
+ data8 0 // setuid // 1045
+ data8 0 // getuid
+ data8 0 // geteuid
+ data8 0 // ptrace
+ data8 0 // access
+ data8 0 // sync // 1050
+ data8 0 // fsync
+ data8 0 // fdatasync
+ data8 0 // kill
+ data8 0 // rename
+ data8 0 // mkdir // 1055
+ data8 0 // rmdir
+ data8 0 // dup
+ data8 0 // pipe
+ data8 0 // times
+ data8 0 // brk // 1060
+ data8 0 // setgid
+ data8 0 // getgid
+ data8 0 // getegid
+ data8 0 // acct
+ data8 0 // ioctl // 1065
+ data8 0 // fcntl
+ data8 0 // umask
+ data8 0 // chroot
+ data8 0 // ustat
+ data8 0 // dup2 // 1070
+ data8 0 // setreuid
+ data8 0 // setregid
+ data8 0 // getresuid
+ data8 0 // setresuid
+ data8 0 // getresgid // 1075
+ data8 0 // setresgid
+ data8 0 // getgroups
+ data8 0 // setgroups
+ data8 0 // getpgid
+ data8 0 // setpgid // 1080
+ data8 0 // setsid
+ data8 0 // getsid
+ data8 0 // sethostname
+ data8 0 // setrlimit
+ data8 0 // getrlimit // 1085
+ data8 0 // getrusage
+ data8 fsys_gettimeofday // gettimeofday
+ data8 0 // settimeofday
+ data8 0 // select
+ data8 0 // poll // 1090
+ data8 0 // symlink
+ data8 0 // readlink
+ data8 0 // uselib
+ data8 0 // swapon
+ data8 0 // swapoff // 1095
+ data8 0 // reboot
+ data8 0 // truncate
+ data8 0 // ftruncate
+ data8 0 // fchmod
+ data8 0 // fchown // 1100
+ data8 0 // getpriority
+ data8 0 // setpriority
+ data8 0 // statfs
+ data8 0 // fstatfs
+ data8 0 // gettid // 1105
+ data8 0 // semget
+ data8 0 // semop
+ data8 0 // semctl
+ data8 0 // msgget
+ data8 0 // msgsnd // 1110
+ data8 0 // msgrcv
+ data8 0 // msgctl
+ data8 0 // shmget
+ data8 0 // shmat
+ data8 0 // shmdt // 1115
+ data8 0 // shmctl
+ data8 0 // syslog
+ data8 0 // setitimer
+ data8 0 // getitimer
+ data8 0 // 1120
+ data8 0
+ data8 0
+ data8 0 // vhangup
+ data8 0 // lchown
+ data8 0 // remap_file_pages // 1125
+ data8 0 // wait4
+ data8 0 // sysinfo
+ data8 0 // clone
+ data8 0 // setdomainname
+ data8 0 // newuname // 1130
+ data8 0 // adjtimex
+ data8 0
+ data8 0 // init_module
+ data8 0 // delete_module
+ data8 0 // 1135
+ data8 0
+ data8 0 // quotactl
+ data8 0 // bdflush
+ data8 0 // sysfs
+ data8 0 // personality // 1140
+ data8 0 // afs_syscall
+ data8 0 // setfsuid
+ data8 0 // setfsgid
+ data8 0 // getdents
+ data8 0 // flock // 1145
+ data8 0 // readv
+ data8 0 // writev
+ data8 0 // pread64
+ data8 0 // pwrite64
+ data8 0 // sysctl // 1150
+ data8 0 // mmap
+ data8 0 // munmap
+ data8 0 // mlock
+ data8 0 // mlockall
+ data8 0 // mprotect // 1155
+ data8 0 // mremap
+ data8 0 // msync
+ data8 0 // munlock
+ data8 0 // munlockall
+ data8 0 // sched_getparam // 1160
+ data8 0 // sched_setparam
+ data8 0 // sched_getscheduler
+ data8 0 // sched_setscheduler
+ data8 0 // sched_yield
+ data8 0 // sched_get_priority_max // 1165
+ data8 0 // sched_get_priority_min
+ data8 0 // sched_rr_get_interval
+ data8 0 // nanosleep
+ data8 0 // nfsservctl
+ data8 0 // prctl // 1170
+ data8 0 // getpagesize
+ data8 0 // mmap2
+ data8 0 // pciconfig_read
+ data8 0 // pciconfig_write
+ data8 0 // perfmonctl // 1175
+ data8 0 // sigaltstack
+ data8 0 // rt_sigaction
+ data8 0 // rt_sigpending
+ data8 0 // rt_sigprocmask
+ data8 0 // rt_sigqueueinfo // 1180
+ data8 0 // rt_sigreturn
+ data8 0 // rt_sigsuspend
+ data8 0 // rt_sigtimedwait
+ data8 0 // getcwd
+ data8 0 // capget // 1185
+ data8 0 // capset
+ data8 0 // sendfile
+ data8 0
+ data8 0
+ data8 0 // socket // 1190
+ data8 0 // bind
+ data8 0 // connect
+ data8 0 // listen
+ data8 0 // accept
+ data8 0 // getsockname // 1195
+ data8 0 // getpeername
+ data8 0 // socketpair
+ data8 0 // send
+ data8 0 // sendto
+ data8 0 // recv // 1200
+ data8 0 // recvfrom
+ data8 0 // shutdown
+ data8 0 // setsockopt
+ data8 0 // getsockopt
+ data8 0 // sendmsg // 1205
+ data8 0 // recvmsg
+ data8 0 // pivot_root
+ data8 0 // mincore
+ data8 0 // madvise
+ data8 0 // newstat // 1210
+ data8 0 // newlstat
+ data8 0 // newfstat
+ data8 0 // clone2
+ data8 0 // getdents64
+ data8 0 // getunwind // 1215
+ data8 0 // readahead
+ data8 0 // setxattr
+ data8 0 // lsetxattr
+ data8 0 // fsetxattr
+ data8 0 // getxattr // 1220
+ data8 0 // lgetxattr
+ data8 0 // fgetxattr
+ data8 0 // listxattr
+ data8 0 // llistxattr
+ data8 0 // flistxattr // 1225
+ data8 0 // removexattr
+ data8 0 // lremovexattr
+ data8 0 // fremovexattr
+ data8 0 // tkill
+ data8 0 // futex // 1230
+ data8 0 // sched_setaffinity
+ data8 0 // sched_getaffinity
+ data8 fsys_set_tid_address // set_tid_address
+ data8 0 // fadvise64_64
+ data8 0 // tgkill // 1235
+ data8 0 // exit_group
+ data8 0 // lookup_dcookie
+ data8 0 // io_setup
+ data8 0 // io_destroy
+ data8 0 // io_getevents // 1240
+ data8 0 // io_submit
+ data8 0 // io_cancel
+ data8 0 // epoll_create
+ data8 0 // epoll_ctl
+ data8 0 // epoll_wait // 1245
+ data8 0 // restart_syscall
+ data8 0 // semtimedop
+ data8 0 // timer_create
+ data8 0 // timer_settime
+ data8 0 // timer_gettime // 1250
+ data8 0 // timer_getoverrun
+ data8 0 // timer_delete
+ data8 0 // clock_settime
+ data8 fsys_clock_gettime // clock_gettime
+ data8 0 // clock_getres // 1255
+ data8 0 // clock_nanosleep
+ data8 0 // fstatfs64
+ data8 0 // statfs64
+ data8 0 // mbind
+ data8 0 // get_mempolicy // 1260
+ data8 0 // set_mempolicy
+ data8 0 // mq_open
+ data8 0 // mq_unlink
+ data8 0 // mq_timedsend
+ data8 0 // mq_timedreceive // 1265
+ data8 0 // mq_notify
+ data8 0 // mq_getsetattr
+ data8 0 // kexec_load
+ data8 0 // vserver
+ data8 0 // waitid // 1270
+ data8 0 // add_key
+ data8 0 // request_key
+ data8 0 // keyctl
+ data8 0 // ioprio_set
+ data8 0 // ioprio_get // 1275
+ data8 0 // move_pages
+ data8 0 // inotify_init
+ data8 0 // inotify_add_watch
+ data8 0 // inotify_rm_watch
+ data8 0 // migrate_pages // 1280
+ data8 0 // openat
+ data8 0 // mkdirat
+ data8 0 // mknodat
+ data8 0 // fchownat
+ data8 0 // futimesat // 1285
+ data8 0 // newfstatat
+ data8 0 // unlinkat
+ data8 0 // renameat
+ data8 0 // linkat
+ data8 0 // symlinkat // 1290
+ data8 0 // readlinkat
+ data8 0 // fchmodat
+ data8 0 // faccessat
+ data8 0
+ data8 0 // 1295
+ data8 0 // unshare
+ data8 0 // splice
+ data8 0 // set_robust_list
+ data8 0 // get_robust_list
+ data8 0 // sync_file_range // 1300
+ data8 0 // tee
+ data8 0 // vmsplice
+ data8 0
+ data8 fsys_getcpu // getcpu // 1304
+
+ // fill in zeros for the remaining entries
+ .zero:
+ .space fsyscall_table + 8*NR_syscalls - .zero, 0