arch/ia64/ia32/ia32_entry.S

   1 #include <asm/asmmacro.h>
   2 #include <asm/ia32.h>
   3 #include <asm/asm-offsets.h>
   4 #include <asm/signal.h>
   5 #include <asm/thread_info.h>
   6
   7 #include "../kernel/minstate.h"
   8
   9         /*
  10          * execve() is special because in case of success, we need to
  11          * setup a null register window frame (in case an IA-32 process
  12          * is exec'ing an IA-64 program).
  13          */
  14 ENTRY(ia32_execve)
  15         .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(3)
  16         alloc loc1=ar.pfs,3,2,4,0
  17         mov loc0=rp
  18         .body
  19         zxt4 out0=in0                   // filename
  20         ;;                              // stop bit between alloc and call
  21         zxt4 out1=in1                   // argv
  22         zxt4 out2=in2                   // envp
  23         add out3=16,sp                  // regs
  24         br.call.sptk.few rp=sys32_execve
  25 1:      cmp.ge p6,p0=r8,r0
  26         mov ar.pfs=loc1                 // restore ar.pfs
  27         ;;
  28 (p6)    mov ar.pfs=r0                   // clear ar.pfs in case of success
  29         sxt4 r8=r8                      // return 64-bit result
  30         mov rp=loc0
  31         br.ret.sptk.few rp
  32 END(ia32_execve)
  33
  34 ENTRY(ia32_clone)
  35         .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(5)
  36         alloc r16=ar.pfs,5,2,6,0
  37         DO_SAVE_SWITCH_STACK
  38         mov loc0=rp
  39         mov loc1=r16                            // save ar.pfs across do_fork
  40         .body
  41         zxt4 out1=in1                           // newsp
  42         mov out3=16                             // stacksize (compensates for 16-byte scratch area)
  43         adds out2=IA64_SWITCH_STACK_SIZE+16,sp  // out2 = &regs
  44         mov out0=in0                            // out0 = clone_flags
  45         zxt4 out4=in2                           // out4 = parent_tidptr
  46         zxt4 out5=in4                           // out5 = child_tidptr
  47         br.call.sptk.many rp=do_fork
  48 .ret0:  .restore sp
  49         adds sp=IA64_SWITCH_STACK_SIZE,sp       // pop the switch stack
  50         mov ar.pfs=loc1
  51         mov rp=loc0
  52         br.ret.sptk.many rp
  53 END(ia32_clone)
  54
  55 GLOBAL_ENTRY(ia32_ret_from_clone)
  56         PT_REGS_UNWIND_INFO(0)
  57 {       /*
  58          * Some versions of gas generate bad unwind info if the first instruction of a
  59          * procedure doesn't go into the first slot of a bundle.  This is a workaround.
  60          */
  61         nop.m 0
  62         nop.i 0
  63         /*
  64          * We need to call schedule_tail() to complete the scheduling process.
  65          * Called by ia64_switch_to after do_fork()->copy_thread().  r8 contains the
  66          * address of the previously executing task.
  67          */
  68         br.call.sptk.many rp=ia64_invoke_schedule_tail
  69 }
  70 .ret1:
  71         adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
  72         ;;
  73         ld4 r2=[r2]
  74         ;;
  75         mov r8=0
  76         and r2=_TIF_SYSCALL_TRACEAUDIT,r2
  77         ;;
  78         cmp.ne p6,p0=r2,r0
  79 (p6)    br.cond.spnt .ia32_strace_check_retval
  80         ;;                                      // prevent RAW on r8
  81 END(ia32_ret_from_clone)
  82         // fall thrugh
  83 GLOBAL_ENTRY(ia32_ret_from_syscall)
  84         PT_REGS_UNWIND_INFO(0)
  85
  86         cmp.ge p6,p7=r8,r0                      // syscall executed successfully?
  87         adds r2=IA64_PT_REGS_R8_OFFSET+16,sp    // r2 = &pt_regs.r8
  88         ;;
  89         alloc r3=ar.pfs,0,0,0,0                 // drop the syscall argument frame
  90         st8 [r2]=r8                             // store return value in slot for r8
  91         br.cond.sptk.many ia64_leave_kernel
  92 END(ia32_ret_from_syscall)
  93
  94         //
  95         // Invoke a system call, but do some tracing before and after the call.
  96         // We MUST preserve the current register frame throughout this routine
  97         // because some system calls (such as ia64_execve) directly
  98         // manipulate ar.pfs.
  99         //
 100         // Input:
 101         //      r8 = syscall number
 102         //      b6 = syscall entry point
 103         //
 104 GLOBAL_ENTRY(ia32_trace_syscall)
 105         PT_REGS_UNWIND_INFO(0)
 106         mov r3=-38
 107         adds r2=IA64_PT_REGS_R8_OFFSET+16,sp
 108         ;;
 109         st8 [r2]=r3                             // initialize return code to -ENOSYS
 110         br.call.sptk.few rp=syscall_trace_enter // give parent a chance to catch syscall args
 111 .ret2:  // Need to reload arguments (they may be changed by the tracing process)
 112         adds r2=IA64_PT_REGS_R1_OFFSET+16,sp    // r2 = &pt_regs.r1
 113         adds r3=IA64_PT_REGS_R13_OFFSET+16,sp   // r3 = &pt_regs.r13
 114         mov r15=IA32_NR_syscalls
 115         ;;
 116         ld4 r8=[r2],IA64_PT_REGS_R9_OFFSET-IA64_PT_REGS_R1_OFFSET
 117         movl r16=ia32_syscall_table
 118         ;;
 119         ld4 r33=[r2],8                          // r9 == ecx
 120         ld4 r37=[r3],16                         // r13 == ebp
 121         cmp.ltu.unc p6,p7=r8,r15
 122         ;;
 123         ld4 r34=[r2],8                          // r10 == edx
 124         ld4 r36=[r3],8                          // r15 == edi
 125 (p6)    shladd r16=r8,3,r16     // force ni_syscall if not valid syscall number
 126         ;;
 127         ld8 r16=[r16]
 128         ;;
 129         ld4 r32=[r2],8                          // r11 == ebx
 130         mov b6=r16
 131         ld4 r35=[r3],8                          // r14 == esi
 132         br.call.sptk.few rp=b6                  // do the syscall
 133 .ia32_strace_check_retval:
 134         cmp.lt p6,p0=r8,r0                      // syscall failed?
 135         adds r2=IA64_PT_REGS_R8_OFFSET+16,sp    // r2 = &pt_regs.r8
 136         ;;
 137         st8.spill [r2]=r8                       // store return value in slot for r8
 138         br.call.sptk.few rp=syscall_trace_leave // give parent a chance to catch return value
 139 .ret4:  alloc r2=ar.pfs,0,0,0,0                 // drop the syscall argument frame
 140         br.cond.sptk.many ia64_leave_kernel
 141 END(ia32_trace_syscall)
 142
 143 GLOBAL_ENTRY(sys32_vfork)
 144         alloc r16=ar.pfs,2,2,4,0;;
 145         mov out0=IA64_CLONE_VFORK|IA64_CLONE_VM|SIGCHLD // out0 = clone_flags
 146         br.cond.sptk.few .fork1                 // do the work
 147 END(sys32_vfork)
 148
 149 GLOBAL_ENTRY(sys32_fork)
 150         .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
 151         alloc r16=ar.pfs,2,2,4,0
 152         mov out0=SIGCHLD                        // out0 = clone_flags
 153         ;;
 154 .fork1:
 155         mov loc0=rp
 156         mov loc1=r16                            // save ar.pfs across do_fork
 157         DO_SAVE_SWITCH_STACK
 158
 159         .body
 160
 161         mov out1=0
 162         mov out3=0
 163         adds out2=IA64_SWITCH_STACK_SIZE+16,sp  // out2 = &regs
 164         br.call.sptk.few rp=do_fork
 165 .ret5:  .restore sp
 166         adds sp=IA64_SWITCH_STACK_SIZE,sp       // pop the switch stack
 167         mov ar.pfs=loc1
 168         mov rp=loc0
 169         br.ret.sptk.many rp
 170 END(sys32_fork)
 171
 172         .rodata
 173         .align 8
 174         .globl ia32_syscall_table
 175 ia32_syscall_table:
 176         data8 sys_ni_syscall      /* 0  -  old "setup(" system call*/
 177         data8 sys_exit
 178         data8 sys32_fork
 179         data8 sys_read
 180         data8 sys_write
 181         data8 compat_sys_open     /* 5 */
 182         data8 sys_close
 183         data8 sys32_waitpid
 184         data8 sys_creat
 185         data8 sys_link
 186         data8 sys_unlink          /* 10 */
 187         data8 ia32_execve
 188         data8 sys_chdir
 189         data8 compat_sys_time
 190         data8 sys_mknod
 191         data8 sys_chmod           /* 15 */
 192         data8 sys_lchown        /* 16-bit version */
 193         data8 sys_ni_syscall      /* old break syscall holder */
 194         data8 sys_ni_syscall
 195         data8 sys32_lseek
 196         data8 sys_getpid          /* 20 */
 197         data8 compat_sys_mount
 198         data8 sys_oldumount
 199         data8 sys_setuid        /* 16-bit version */
 200         data8 sys_getuid        /* 16-bit version */
 201         data8 compat_sys_stime    /* 25 */
 202         data8 sys32_ptrace
 203         data8 sys32_alarm
 204         data8 sys_ni_syscall
 205         data8 sys32_pause
 206         data8 compat_sys_utime    /* 30 */
 207         data8 sys_ni_syscall      /* old stty syscall holder */
 208         data8 sys_ni_syscall      /* old gtty syscall holder */
 209         data8 sys_access
 210         data8 sys_nice
 211         data8 sys_ni_syscall      /* 35 */        /* old ftime syscall holder */
 212         data8 sys_sync
 213         data8 sys_kill
 214         data8 sys_rename
 215         data8 sys_mkdir
 216         data8 sys_rmdir           /* 40 */
 217         data8 sys_dup
 218         data8 sys32_pipe
 219         data8 compat_sys_times
 220         data8 sys_ni_syscall      /* old prof syscall holder */
 221         data8 sys32_brk           /* 45 */
 222         data8 sys_setgid        /* 16-bit version */
 223         data8 sys_getgid        /* 16-bit version */
 224         data8 sys32_signal
 225         data8 sys_geteuid       /* 16-bit version */
 226         data8 sys_getegid       /* 16-bit version */      /* 50 */
 227         data8 sys_acct
 228         data8 sys_umount          /* recycled never used phys( */
 229         data8 sys_ni_syscall      /* old lock syscall holder */
 230         data8 compat_sys_ioctl
 231         data8 compat_sys_fcntl    /* 55 */
 232         data8 sys_ni_syscall      /* old mpx syscall holder */
 233         data8 sys_setpgid
 234         data8 sys_ni_syscall      /* old ulimit syscall holder */
 235         data8 sys_ni_syscall
 236         data8 sys_umask           /* 60 */
 237         data8 sys_chroot
 238         data8 sys_ustat
 239         data8 sys_dup2
 240         data8 sys_getppid
 241         data8 sys_getpgrp         /* 65 */
 242         data8 sys_setsid
 243         data8 sys32_sigaction
 244         data8 sys_ni_syscall
 245         data8 sys_ni_syscall
 246         data8 sys_setreuid      /* 16-bit version */      /* 70 */
 247         data8 sys_setregid      /* 16-bit version */
 248         data8 sys32_sigsuspend
 249         data8 compat_sys_sigpending
 250         data8 sys_sethostname
 251         data8 compat_sys_setrlimit        /* 75 */
 252         data8 compat_sys_old_getrlimit
 253         data8 compat_sys_getrusage
 254         data8 sys32_gettimeofday
 255         data8 sys32_settimeofday
 256         data8 sys32_getgroups16   /* 80 */
 257         data8 sys32_setgroups16
 258         data8 sys32_old_select
 259         data8 sys_symlink
 260         data8 sys_ni_syscall
 261         data8 sys_readlink        /* 85 */
 262         data8 sys_uselib
 263         data8 sys_swapon
 264         data8 sys_reboot
 265         data8 sys32_readdir
 266         data8 sys32_mmap          /* 90 */
 267         data8 sys32_munmap
 268         data8 sys_truncate
 269         data8 sys_ftruncate
 270         data8 sys_fchmod
 271         data8 sys_fchown        /* 16-bit version */      /* 95 */
 272         data8 sys_getpriority
 273         data8 sys_setpriority
 274         data8 sys_ni_syscall      /* old profil syscall holder */
 275         data8 compat_sys_statfs
 276         data8 compat_sys_fstatfs          /* 100 */
 277         data8 sys_ni_syscall    /* ioperm */
 278         data8 compat_sys_socketcall
 279         data8 sys_syslog
 280         data8 compat_sys_setitimer
 281         data8 compat_sys_getitimer        /* 105 */
 282         data8 compat_sys_newstat
 283         data8 compat_sys_newlstat
 284         data8 compat_sys_newfstat
 285         data8 sys_ni_syscall
 286         data8 sys_ni_syscall    /* iopl */      /* 110 */
 287         data8 sys_vhangup
 288         data8 sys_ni_syscall            /* used to be sys_idle */
 289         data8 sys_ni_syscall
 290         data8 compat_sys_wait4
 291         data8 sys_swapoff         /* 115 */
 292         data8 compat_sys_sysinfo
 293         data8 sys32_ipc
 294         data8 sys_fsync
 295         data8 sys32_sigreturn
 296         data8 ia32_clone          /* 120 */
 297         data8 sys_setdomainname
 298         data8 sys32_newuname
 299         data8 sys32_modify_ldt
 300         data8 compat_sys_adjtimex
 301         data8 sys32_mprotect      /* 125 */
 302         data8 compat_sys_sigprocmask
 303         data8 sys_ni_syscall    /* create_module */
 304         data8 sys_ni_syscall    /* init_module */
 305         data8 sys_ni_syscall    /* delete_module */
 306         data8 sys_ni_syscall    /* get_kernel_syms */  /* 130 */
 307         data8 sys_quotactl
 308         data8 sys_getpgid
 309         data8 sys_fchdir
 310         data8 sys_ni_syscall    /* sys_bdflush */
 311         data8 sys_sysfs         /* 135 */
 312         data8 sys32_personality
 313         data8 sys_ni_syscall      /* for afs_syscall */
 314         data8 sys_setfsuid      /* 16-bit version */
 315         data8 sys_setfsgid      /* 16-bit version */
 316         data8 sys_llseek          /* 140 */
 317         data8 compat_sys_getdents
 318         data8 compat_sys_select
 319         data8 sys_flock
 320         data8 sys32_msync
 321         data8 compat_sys_readv    /* 145 */
 322         data8 compat_sys_writev
 323         data8 sys_getsid
 324         data8 sys_fdatasync
 325         data8 sys32_sysctl
 326         data8 sys_mlock           /* 150 */
 327         data8 sys_munlock
 328         data8 sys_mlockall
 329         data8 sys_munlockall
 330         data8 sys_sched_setparam
 331         data8 sys_sched_getparam  /* 155 */
 332         data8 sys_sched_setscheduler
 333         data8 sys_sched_getscheduler
 334         data8 sys_sched_yield
 335         data8 sys_sched_get_priority_max
 336         data8 sys_sched_get_priority_min         /* 160 */
 337         data8 sys32_sched_rr_get_interval
 338         data8 compat_sys_nanosleep
 339         data8 sys32_mremap
 340         data8 sys_setresuid     /* 16-bit version */
 341         data8 sys32_getresuid16 /* 16-bit version */      /* 165 */
 342         data8 sys_ni_syscall    /* vm86 */
 343         data8 sys_ni_syscall    /* sys_query_module */
 344         data8 sys_poll
 345         data8 sys_ni_syscall    /* nfsservctl */
 346         data8 sys_setresgid       /* 170 */
 347         data8 sys32_getresgid16
 348         data8 sys_prctl
 349         data8 sys32_rt_sigreturn
 350         data8 sys32_rt_sigaction
 351         data8 sys32_rt_sigprocmask /* 175 */
 352         data8 sys_rt_sigpending
 353         data8 compat_sys_rt_sigtimedwait
 354         data8 sys32_rt_sigqueueinfo
 355         data8 compat_sys_rt_sigsuspend
 356         data8 sys32_pread         /* 180 */
 357         data8 sys32_pwrite
 358         data8 sys_chown /* 16-bit version */
 359         data8 sys_getcwd
 360         data8 sys_capget
 361         data8 sys_capset          /* 185 */
 362         data8 sys32_sigaltstack
 363         data8 sys32_sendfile
 364         data8 sys_ni_syscall              /* streams1 */
 365         data8 sys_ni_syscall              /* streams2 */
 366         data8 sys32_vfork         /* 190 */
 367         data8 compat_sys_getrlimit
 368         data8 sys32_mmap2
 369         data8 sys32_truncate64
 370         data8 sys32_ftruncate64
 371         data8 sys32_stat64        /* 195 */
 372         data8 sys32_lstat64
 373         data8 sys32_fstat64
 374         data8 sys_lchown
 375         data8 sys_getuid
 376         data8 sys_getgid          /* 200 */
 377         data8 sys_geteuid
 378         data8 sys_getegid
 379         data8 sys_setreuid
 380         data8 sys_setregid
 381         data8 sys_getgroups       /* 205 */
 382         data8 sys_setgroups
 383         data8 sys_fchown
 384         data8 sys_setresuid
 385         data8 sys_getresuid
 386         data8 sys_setresgid       /* 210 */
 387         data8 sys_getresgid
 388         data8 sys_chown
 389         data8 sys_setuid
 390         data8 sys_setgid
 391         data8 sys_setfsuid        /* 215 */
 392         data8 sys_setfsgid
 393         data8 sys_pivot_root
 394         data8 sys_mincore
 395         data8 sys_madvise
 396         data8 compat_sys_getdents64       /* 220 */
 397         data8 compat_sys_fcntl64
 398         data8 sys_ni_syscall            /* reserved for TUX */
 399         data8 sys_ni_syscall            /* reserved for Security */
 400         data8 sys_gettid
 401         data8 sys_readahead       /* 225 */
 402         data8 sys_setxattr
 403         data8 sys_lsetxattr
 404         data8 sys_fsetxattr
 405         data8 sys_getxattr
 406         data8 sys_lgetxattr     /* 230 */
 407         data8 sys_fgetxattr
 408         data8 sys_listxattr
 409         data8 sys_llistxattr
 410         data8 sys_flistxattr
 411         data8 sys_removexattr   /* 235 */
 412         data8 sys_lremovexattr
 413         data8 sys_fremovexattr
 414         data8 sys_tkill
 415         data8 sys_sendfile64
 416         data8 compat_sys_futex  /* 240 */
 417         data8 compat_sys_sched_setaffinity
 418         data8 compat_sys_sched_getaffinity
 419         data8 sys32_set_thread_area
 420         data8 sys32_get_thread_area
 421         data8 compat_sys_io_setup       /* 245 */
 422         data8 sys_io_destroy
 423         data8 compat_sys_io_getevents
 424         data8 compat_sys_io_submit
 425         data8 sys_io_cancel
 426         data8 sys_fadvise64     /* 250 */
 427         data8 sys_ni_syscall
 428         data8 sys_exit_group
 429         data8 sys_lookup_dcookie
 430         data8 sys_epoll_create
 431         data8 sys32_epoll_ctl   /* 255 */
 432         data8 sys32_epoll_wait
 433         data8 sys_remap_file_pages
 434         data8 sys_set_tid_address
 435         data8 compat_sys_timer_create
 436         data8 compat_sys_timer_settime  /* 260 */
 437         data8 compat_sys_timer_gettime
 438         data8 sys_timer_getoverrun
 439         data8 sys_timer_delete
 440         data8 compat_sys_clock_settime
 441         data8 compat_sys_clock_gettime /* 265 */
 442         data8 compat_sys_clock_getres
 443         data8 compat_sys_clock_nanosleep
 444         data8 compat_sys_statfs64
 445         data8 compat_sys_fstatfs64
 446         data8 sys_tgkill        /* 270 */
 447         data8 compat_sys_utimes
 448         data8 sys32_fadvise64_64
 449         data8 sys_ni_syscall
 450         data8 sys_ni_syscall
 451         data8 sys_ni_syscall    /* 275 */
 452         data8 sys_ni_syscall
 453         data8 compat_sys_mq_open
 454         data8 sys_mq_unlink
 455         data8 compat_sys_mq_timedsend
 456         data8 compat_sys_mq_timedreceive        /* 280 */
 457         data8 compat_sys_mq_notify
 458         data8 compat_sys_mq_getsetattr
 459         data8 sys_ni_syscall            /* reserved for kexec */
 460         data8 compat_sys_waitid
 461
 462         // guard against failures to increase IA32_NR_syscalls
 463         .org ia32_syscall_table + 8*IA32_NR_syscalls