2012-10-09 16:47:43 +08:00
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/*
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* System calls under the Sparc.
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*
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* Don't be scared by the ugly clobbers, it is the only way I can
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* think of right now to force the arguments into fixed registers
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* before the trap into the system call with gcc 'asm' statements.
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*
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* Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
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*
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* SunOS compatibility based upon preliminary work which is:
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*
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* Copyright (C) 1995 Adrian M. Rodriguez (adrian@remus.rutgers.edu)
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*/
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#ifndef _UAPI_SPARC_UNISTD_H
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#define _UAPI_SPARC_UNISTD_H
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#ifndef __32bit_syscall_numbers__
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#ifndef __arch64__
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#define __32bit_syscall_numbers__
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#endif
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#endif
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#define __NR_restart_syscall 0 /* Linux Specific */
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#define __NR_exit 1 /* Common */
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#define __NR_fork 2 /* Common */
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#define __NR_read 3 /* Common */
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#define __NR_write 4 /* Common */
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#define __NR_open 5 /* Common */
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#define __NR_close 6 /* Common */
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#define __NR_wait4 7 /* Common */
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#define __NR_creat 8 /* Common */
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#define __NR_link 9 /* Common */
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#define __NR_unlink 10 /* Common */
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#define __NR_execv 11 /* SunOS Specific */
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#define __NR_chdir 12 /* Common */
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#define __NR_chown 13 /* Common */
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#define __NR_mknod 14 /* Common */
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#define __NR_chmod 15 /* Common */
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#define __NR_lchown 16 /* Common */
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#define __NR_brk 17 /* Common */
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#define __NR_perfctr 18 /* Performance counter operations */
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#define __NR_lseek 19 /* Common */
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#define __NR_getpid 20 /* Common */
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#define __NR_capget 21 /* Linux Specific */
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#define __NR_capset 22 /* Linux Specific */
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#define __NR_setuid 23 /* Implemented via setreuid in SunOS */
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#define __NR_getuid 24 /* Common */
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#define __NR_vmsplice 25 /* ENOSYS under SunOS */
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#define __NR_ptrace 26 /* Common */
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#define __NR_alarm 27 /* Implemented via setitimer in SunOS */
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#define __NR_sigaltstack 28 /* Common */
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#define __NR_pause 29 /* Is sigblock(0)->sigpause() in SunOS */
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#define __NR_utime 30 /* Implemented via utimes() under SunOS */
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#ifdef __32bit_syscall_numbers__
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#define __NR_lchown32 31 /* Linux sparc32 specific */
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#define __NR_fchown32 32 /* Linux sparc32 specific */
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#endif
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#define __NR_access 33 /* Common */
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#define __NR_nice 34 /* Implemented via get/setpriority() in SunOS */
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#ifdef __32bit_syscall_numbers__
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#define __NR_chown32 35 /* Linux sparc32 specific */
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#endif
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#define __NR_sync 36 /* Common */
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#define __NR_kill 37 /* Common */
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#define __NR_stat 38 /* Common */
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#define __NR_sendfile 39 /* Linux Specific */
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#define __NR_lstat 40 /* Common */
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#define __NR_dup 41 /* Common */
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#define __NR_pipe 42 /* Common */
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#define __NR_times 43 /* Implemented via getrusage() in SunOS */
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#ifdef __32bit_syscall_numbers__
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#define __NR_getuid32 44 /* Linux sparc32 specific */
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#endif
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#define __NR_umount2 45 /* Linux Specific */
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#define __NR_setgid 46 /* Implemented via setregid() in SunOS */
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#define __NR_getgid 47 /* Common */
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#define __NR_signal 48 /* Implemented via sigvec() in SunOS */
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#define __NR_geteuid 49 /* SunOS calls getuid() */
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#define __NR_getegid 50 /* SunOS calls getgid() */
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#define __NR_acct 51 /* Common */
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#ifdef __32bit_syscall_numbers__
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#define __NR_getgid32 53 /* Linux sparc32 specific */
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#else
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#define __NR_memory_ordering 52 /* Linux Specific */
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#endif
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#define __NR_ioctl 54 /* Common */
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#define __NR_reboot 55 /* Common */
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#ifdef __32bit_syscall_numbers__
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#define __NR_mmap2 56 /* Linux sparc32 Specific */
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#endif
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#define __NR_symlink 57 /* Common */
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#define __NR_readlink 58 /* Common */
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#define __NR_execve 59 /* Common */
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#define __NR_umask 60 /* Common */
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#define __NR_chroot 61 /* Common */
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#define __NR_fstat 62 /* Common */
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#define __NR_fstat64 63 /* Linux Specific */
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#define __NR_getpagesize 64 /* Common */
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#define __NR_msync 65 /* Common in newer 1.3.x revs... */
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#define __NR_vfork 66 /* Common */
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#define __NR_pread64 67 /* Linux Specific */
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#define __NR_pwrite64 68 /* Linux Specific */
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#ifdef __32bit_syscall_numbers__
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#define __NR_geteuid32 69 /* Linux sparc32, sbrk under SunOS */
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#define __NR_getegid32 70 /* Linux sparc32, sstk under SunOS */
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#endif
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#define __NR_mmap 71 /* Common */
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#ifdef __32bit_syscall_numbers__
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#define __NR_setreuid32 72 /* Linux sparc32, vadvise under SunOS */
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#endif
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#define __NR_munmap 73 /* Common */
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#define __NR_mprotect 74 /* Common */
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#define __NR_madvise 75 /* Common */
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#define __NR_vhangup 76 /* Common */
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#ifdef __32bit_syscall_numbers__
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#define __NR_truncate64 77 /* Linux sparc32 Specific */
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#endif
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#define __NR_mincore 78 /* Common */
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#define __NR_getgroups 79 /* Common */
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#define __NR_setgroups 80 /* Common */
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#define __NR_getpgrp 81 /* Common */
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#ifdef __32bit_syscall_numbers__
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#define __NR_setgroups32 82 /* Linux sparc32, setpgrp under SunOS */
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#endif
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#define __NR_setitimer 83 /* Common */
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#ifdef __32bit_syscall_numbers__
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#define __NR_ftruncate64 84 /* Linux sparc32 Specific */
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#endif
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#define __NR_swapon 85 /* Common */
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#define __NR_getitimer 86 /* Common */
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#ifdef __32bit_syscall_numbers__
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#define __NR_setuid32 87 /* Linux sparc32, gethostname under SunOS */
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#endif
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#define __NR_sethostname 88 /* Common */
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#ifdef __32bit_syscall_numbers__
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#define __NR_setgid32 89 /* Linux sparc32, getdtablesize under SunOS */
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#endif
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#define __NR_dup2 90 /* Common */
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#ifdef __32bit_syscall_numbers__
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#define __NR_setfsuid32 91 /* Linux sparc32, getdopt under SunOS */
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#endif
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#define __NR_fcntl 92 /* Common */
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#define __NR_select 93 /* Common */
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#ifdef __32bit_syscall_numbers__
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#define __NR_setfsgid32 94 /* Linux sparc32, setdopt under SunOS */
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#endif
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#define __NR_fsync 95 /* Common */
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#define __NR_setpriority 96 /* Common */
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#define __NR_socket 97 /* Common */
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#define __NR_connect 98 /* Common */
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#define __NR_accept 99 /* Common */
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#define __NR_getpriority 100 /* Common */
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#define __NR_rt_sigreturn 101 /* Linux Specific */
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#define __NR_rt_sigaction 102 /* Linux Specific */
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#define __NR_rt_sigprocmask 103 /* Linux Specific */
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#define __NR_rt_sigpending 104 /* Linux Specific */
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#define __NR_rt_sigtimedwait 105 /* Linux Specific */
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#define __NR_rt_sigqueueinfo 106 /* Linux Specific */
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#define __NR_rt_sigsuspend 107 /* Linux Specific */
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#ifdef __32bit_syscall_numbers__
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#define __NR_setresuid32 108 /* Linux Specific, sigvec under SunOS */
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#define __NR_getresuid32 109 /* Linux Specific, sigblock under SunOS */
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#define __NR_setresgid32 110 /* Linux Specific, sigsetmask under SunOS */
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#define __NR_getresgid32 111 /* Linux Specific, sigpause under SunOS */
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#define __NR_setregid32 112 /* Linux sparc32, sigstack under SunOS */
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#else
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#define __NR_setresuid 108 /* Linux Specific, sigvec under SunOS */
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#define __NR_getresuid 109 /* Linux Specific, sigblock under SunOS */
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#define __NR_setresgid 110 /* Linux Specific, sigsetmask under SunOS */
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#define __NR_getresgid 111 /* Linux Specific, sigpause under SunOS */
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#endif
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#define __NR_recvmsg 113 /* Common */
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#define __NR_sendmsg 114 /* Common */
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#ifdef __32bit_syscall_numbers__
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#define __NR_getgroups32 115 /* Linux sparc32, vtrace under SunOS */
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#endif
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#define __NR_gettimeofday 116 /* Common */
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#define __NR_getrusage 117 /* Common */
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#define __NR_getsockopt 118 /* Common */
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#define __NR_getcwd 119 /* Linux Specific */
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#define __NR_readv 120 /* Common */
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#define __NR_writev 121 /* Common */
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#define __NR_settimeofday 122 /* Common */
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#define __NR_fchown 123 /* Common */
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#define __NR_fchmod 124 /* Common */
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#define __NR_recvfrom 125 /* Common */
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#define __NR_setreuid 126 /* Common */
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#define __NR_setregid 127 /* Common */
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#define __NR_rename 128 /* Common */
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#define __NR_truncate 129 /* Common */
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#define __NR_ftruncate 130 /* Common */
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#define __NR_flock 131 /* Common */
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#define __NR_lstat64 132 /* Linux Specific */
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#define __NR_sendto 133 /* Common */
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#define __NR_shutdown 134 /* Common */
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#define __NR_socketpair 135 /* Common */
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#define __NR_mkdir 136 /* Common */
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#define __NR_rmdir 137 /* Common */
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#define __NR_utimes 138 /* SunOS Specific */
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#define __NR_stat64 139 /* Linux Specific */
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#define __NR_sendfile64 140 /* adjtime under SunOS */
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#define __NR_getpeername 141 /* Common */
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#define __NR_futex 142 /* gethostid under SunOS */
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#define __NR_gettid 143 /* ENOSYS under SunOS */
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#define __NR_getrlimit 144 /* Common */
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#define __NR_setrlimit 145 /* Common */
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#define __NR_pivot_root 146 /* Linux Specific, killpg under SunOS */
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#define __NR_prctl 147 /* ENOSYS under SunOS */
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#define __NR_pciconfig_read 148 /* ENOSYS under SunOS */
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#define __NR_pciconfig_write 149 /* ENOSYS under SunOS */
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#define __NR_getsockname 150 /* Common */
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#define __NR_inotify_init 151 /* Linux specific */
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#define __NR_inotify_add_watch 152 /* Linux specific */
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#define __NR_poll 153 /* Common */
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#define __NR_getdents64 154 /* Linux specific */
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#ifdef __32bit_syscall_numbers__
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#define __NR_fcntl64 155 /* Linux sparc32 Specific */
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#endif
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#define __NR_inotify_rm_watch 156 /* Linux specific */
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#define __NR_statfs 157 /* Common */
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#define __NR_fstatfs 158 /* Common */
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#define __NR_umount 159 /* Common */
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#define __NR_sched_set_affinity 160 /* Linux specific, async_daemon under SunOS */
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#define __NR_sched_get_affinity 161 /* Linux specific, getfh under SunOS */
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#define __NR_getdomainname 162 /* SunOS Specific */
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#define __NR_setdomainname 163 /* Common */
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#ifndef __32bit_syscall_numbers__
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#define __NR_utrap_install 164 /* SYSV ABI/v9 required */
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#endif
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#define __NR_quotactl 165 /* Common */
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#define __NR_set_tid_address 166 /* Linux specific, exportfs under SunOS */
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#define __NR_mount 167 /* Common */
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#define __NR_ustat 168 /* Common */
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#define __NR_setxattr 169 /* SunOS: semsys */
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#define __NR_lsetxattr 170 /* SunOS: msgsys */
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#define __NR_fsetxattr 171 /* SunOS: shmsys */
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#define __NR_getxattr 172 /* SunOS: auditsys */
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#define __NR_lgetxattr 173 /* SunOS: rfssys */
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#define __NR_getdents 174 /* Common */
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#define __NR_setsid 175 /* Common */
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#define __NR_fchdir 176 /* Common */
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#define __NR_fgetxattr 177 /* SunOS: fchroot */
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#define __NR_listxattr 178 /* SunOS: vpixsys */
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#define __NR_llistxattr 179 /* SunOS: aioread */
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#define __NR_flistxattr 180 /* SunOS: aiowrite */
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#define __NR_removexattr 181 /* SunOS: aiowait */
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#define __NR_lremovexattr 182 /* SunOS: aiocancel */
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#define __NR_sigpending 183 /* Common */
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#define __NR_query_module 184 /* Linux Specific */
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#define __NR_setpgid 185 /* Common */
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#define __NR_fremovexattr 186 /* SunOS: pathconf */
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#define __NR_tkill 187 /* SunOS: fpathconf */
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#define __NR_exit_group 188 /* Linux specific, sysconf undef SunOS */
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#define __NR_uname 189 /* Linux Specific */
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#define __NR_init_module 190 /* Linux Specific */
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#define __NR_personality 191 /* Linux Specific */
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#define __NR_remap_file_pages 192 /* Linux Specific */
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#define __NR_epoll_create 193 /* Linux Specific */
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#define __NR_epoll_ctl 194 /* Linux Specific */
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#define __NR_epoll_wait 195 /* Linux Specific */
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#define __NR_ioprio_set 196 /* Linux Specific */
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#define __NR_getppid 197 /* Linux Specific */
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#define __NR_sigaction 198 /* Linux Specific */
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#define __NR_sgetmask 199 /* Linux Specific */
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#define __NR_ssetmask 200 /* Linux Specific */
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#define __NR_sigsuspend 201 /* Linux Specific */
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#define __NR_oldlstat 202 /* Linux Specific */
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#define __NR_uselib 203 /* Linux Specific */
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#define __NR_readdir 204 /* Linux Specific */
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#define __NR_readahead 205 /* Linux Specific */
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#define __NR_socketcall 206 /* Linux Specific */
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#define __NR_syslog 207 /* Linux Specific */
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#define __NR_lookup_dcookie 208 /* Linux Specific */
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#define __NR_fadvise64 209 /* Linux Specific */
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#define __NR_fadvise64_64 210 /* Linux Specific */
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#define __NR_tgkill 211 /* Linux Specific */
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#define __NR_waitpid 212 /* Linux Specific */
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#define __NR_swapoff 213 /* Linux Specific */
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#define __NR_sysinfo 214 /* Linux Specific */
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#define __NR_ipc 215 /* Linux Specific */
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#define __NR_sigreturn 216 /* Linux Specific */
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#define __NR_clone 217 /* Linux Specific */
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#define __NR_ioprio_get 218 /* Linux Specific */
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#define __NR_adjtimex 219 /* Linux Specific */
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#define __NR_sigprocmask 220 /* Linux Specific */
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#define __NR_create_module 221 /* Linux Specific */
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#define __NR_delete_module 222 /* Linux Specific */
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#define __NR_get_kernel_syms 223 /* Linux Specific */
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#define __NR_getpgid 224 /* Linux Specific */
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#define __NR_bdflush 225 /* Linux Specific */
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#define __NR_sysfs 226 /* Linux Specific */
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#define __NR_afs_syscall 227 /* Linux Specific */
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#define __NR_setfsuid 228 /* Linux Specific */
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#define __NR_setfsgid 229 /* Linux Specific */
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#define __NR__newselect 230 /* Linux Specific */
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#ifdef __32bit_syscall_numbers__
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#define __NR_time 231 /* Linux Specific */
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#else
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#endif
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#define __NR_splice 232 /* Linux Specific */
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#define __NR_stime 233 /* Linux Specific */
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#define __NR_statfs64 234 /* Linux Specific */
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#define __NR_fstatfs64 235 /* Linux Specific */
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#define __NR__llseek 236 /* Linux Specific */
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#define __NR_mlock 237
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#define __NR_munlock 238
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#define __NR_mlockall 239
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#define __NR_munlockall 240
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#define __NR_sched_setparam 241
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#define __NR_sched_getparam 242
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#define __NR_sched_setscheduler 243
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#define __NR_sched_getscheduler 244
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#define __NR_sched_yield 245
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#define __NR_sched_get_priority_max 246
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#define __NR_sched_get_priority_min 247
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#define __NR_sched_rr_get_interval 248
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#define __NR_nanosleep 249
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#define __NR_mremap 250
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#define __NR__sysctl 251
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#define __NR_getsid 252
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#define __NR_fdatasync 253
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#define __NR_nfsservctl 254
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#define __NR_sync_file_range 255
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#define __NR_clock_settime 256
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#define __NR_clock_gettime 257
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#define __NR_clock_getres 258
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#define __NR_clock_nanosleep 259
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#define __NR_sched_getaffinity 260
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#define __NR_sched_setaffinity 261
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#define __NR_timer_settime 262
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#define __NR_timer_gettime 263
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#define __NR_timer_getoverrun 264
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#define __NR_timer_delete 265
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#define __NR_timer_create 266
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/* #define __NR_vserver 267 Reserved for VSERVER */
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#define __NR_io_setup 268
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#define __NR_io_destroy 269
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#define __NR_io_submit 270
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#define __NR_io_cancel 271
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#define __NR_io_getevents 272
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#define __NR_mq_open 273
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#define __NR_mq_unlink 274
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#define __NR_mq_timedsend 275
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#define __NR_mq_timedreceive 276
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#define __NR_mq_notify 277
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#define __NR_mq_getsetattr 278
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#define __NR_waitid 279
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#define __NR_tee 280
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#define __NR_add_key 281
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#define __NR_request_key 282
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#define __NR_keyctl 283
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#define __NR_openat 284
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#define __NR_mkdirat 285
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#define __NR_mknodat 286
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#define __NR_fchownat 287
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#define __NR_futimesat 288
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#define __NR_fstatat64 289
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#define __NR_unlinkat 290
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|
#define __NR_renameat 291
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#define __NR_linkat 292
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#define __NR_symlinkat 293
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#define __NR_readlinkat 294
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|
#define __NR_fchmodat 295
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#define __NR_faccessat 296
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#define __NR_pselect6 297
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#define __NR_ppoll 298
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#define __NR_unshare 299
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|
#define __NR_set_robust_list 300
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|
#define __NR_get_robust_list 301
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|
#define __NR_migrate_pages 302
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|
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|
#define __NR_mbind 303
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|
|
#define __NR_get_mempolicy 304
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|
#define __NR_set_mempolicy 305
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|
#define __NR_kexec_load 306
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|
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|
|
#define __NR_move_pages 307
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|
#define __NR_getcpu 308
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|
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|
|
#define __NR_epoll_pwait 309
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|
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|
|
#define __NR_utimensat 310
|
|
|
|
|
#define __NR_signalfd 311
|
|
|
|
|
#define __NR_timerfd_create 312
|
|
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|
|
#define __NR_eventfd 313
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|
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|
|
#define __NR_fallocate 314
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|
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|
|
#define __NR_timerfd_settime 315
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|
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|
|
#define __NR_timerfd_gettime 316
|
|
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|
|
#define __NR_signalfd4 317
|
|
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|
|
#define __NR_eventfd2 318
|
|
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|
|
#define __NR_epoll_create1 319
|
|
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|
|
#define __NR_dup3 320
|
|
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|
|
#define __NR_pipe2 321
|
|
|
|
|
#define __NR_inotify_init1 322
|
|
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|
|
#define __NR_accept4 323
|
|
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|
|
#define __NR_preadv 324
|
|
|
|
|
#define __NR_pwritev 325
|
|
|
|
|
#define __NR_rt_tgsigqueueinfo 326
|
|
|
|
|
#define __NR_perf_event_open 327
|
|
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|
|
#define __NR_recvmmsg 328
|
|
|
|
|
#define __NR_fanotify_init 329
|
|
|
|
|
#define __NR_fanotify_mark 330
|
|
|
|
|
#define __NR_prlimit64 331
|
|
|
|
|
#define __NR_name_to_handle_at 332
|
|
|
|
|
#define __NR_open_by_handle_at 333
|
|
|
|
|
#define __NR_clock_adjtime 334
|
|
|
|
|
#define __NR_syncfs 335
|
|
|
|
|
#define __NR_sendmmsg 336
|
|
|
|
|
#define __NR_setns 337
|
|
|
|
|
#define __NR_process_vm_readv 338
|
|
|
|
|
#define __NR_process_vm_writev 339
|
sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads.
The Montgomery Multiply, Montgomery Square, and Multiple-Precision
Multiply instructions work by loading a combination of the floating
point and multiple register windows worth of integer registers
with the inputs.
These values are 64-bit. But for 32-bit userland processes we only
save the low 32-bits of each integer register during a register spill.
This is because the register window save area is in the user stack and
has a fixed layout.
Therefore, the only way to use these instruction in 32-bit mode is to
perform the following sequence:
1) Load the top-32bits of a choosen integer register with a sentinel,
say "-1". This will be in the outer-most register window.
The idea is that we're trying to see if the outer-most register
window gets spilled, and thus the 64-bit values were truncated.
2) Load all the inputs for the montmul/montsqr/mpmul instruction,
down to the inner-most register window.
3) Execute the opcode.
4) Traverse back up to the outer-most register window.
5) Check the sentinel, if it's still "-1" store the results.
Otherwise retry the entire sequence.
This retry is extremely troublesome. If you're just unlucky and an
interrupt or other trap happens, it'll push that outer-most window to
the stack and clear the sentinel when we restore it.
We could retry forever and never make forward progress if interrupts
arrive at a fast enough rate (consider perf events as one example).
So we have do limited retries and fallback to software which is
extremely non-deterministic.
Luckily it's very straightforward to provide a mechanism to let
32-bit applications use a 64-bit stack. Stacks in 64-bit mode are
biased by 2047 bytes, which means that the lowest bit is set in the
actual %sp register value.
So if we see bit zero set in a 32-bit application's stack we treat
it like a 64-bit stack.
Runtime detection of such a facility is tricky, and cumbersome at
best. For example, just trying to use a biased stack and seeing if it
works is hard to recover from (the signal handler will need to use an
alt stack, plus something along the lines of longjmp). Therefore, we
add a system call to report a bitmask of arch specific features like
this in a cheap and less hairy way.
With help from Andy Polyakov.
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-27 06:18:37 +08:00
|
|
|
#define __NR_kern_features 340
|
2012-10-29 04:15:09 +08:00
|
|
|
#define __NR_kcmp 341
|
2012-12-29 14:38:51 +08:00
|
|
|
#define __NR_finit_module 342
|
2014-01-29 16:45:06 +08:00
|
|
|
#define __NR_sched_setattr 343
|
|
|
|
|
#define __NR_sched_getattr 344
|
2014-07-22 13:27:56 +08:00
|
|
|
#define __NR_renameat2 345
|
2014-08-07 05:50:52 +08:00
|
|
|
#define __NR_seccomp 346
|
|
|
|
|
#define __NR_getrandom 347
|
2014-08-14 13:00:09 +08:00
|
|
|
#define __NR_memfd_create 348
|
2014-10-29 02:30:43 +08:00
|
|
|
#define __NR_bpf 349
|
2014-12-13 08:57:39 +08:00
|
|
|
#define __NR_execveat 350
|
2015-11-10 06:58:06 +08:00
|
|
|
#define __NR_membarrier 351
|
2015-11-21 07:54:06 +08:00
|
|
|
#define __NR_userfaultfd 352
|
2016-01-01 04:18:02 +08:00
|
|
|
#define __NR_bind 353
|
|
|
|
|
#define __NR_listen 354
|
|
|
|
|
#define __NR_setsockopt 355
|
2016-01-01 04:38:56 +08:00
|
|
|
#define __NR_mlock2 356
|
2016-01-22 07:51:17 +08:00
|
|
|
#define __NR_copy_file_range 357
|
2016-03-30 09:39:26 +08:00
|
|
|
#define __NR_preadv2 358
|
|
|
|
|
#define __NR_pwritev2 359
|
2012-10-09 16:47:43 +08:00
|
|
|
|
2016-03-30 09:39:26 +08:00
|
|
|
#define NR_syscalls 360
|
sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads.
The Montgomery Multiply, Montgomery Square, and Multiple-Precision
Multiply instructions work by loading a combination of the floating
point and multiple register windows worth of integer registers
with the inputs.
These values are 64-bit. But for 32-bit userland processes we only
save the low 32-bits of each integer register during a register spill.
This is because the register window save area is in the user stack and
has a fixed layout.
Therefore, the only way to use these instruction in 32-bit mode is to
perform the following sequence:
1) Load the top-32bits of a choosen integer register with a sentinel,
say "-1". This will be in the outer-most register window.
The idea is that we're trying to see if the outer-most register
window gets spilled, and thus the 64-bit values were truncated.
2) Load all the inputs for the montmul/montsqr/mpmul instruction,
down to the inner-most register window.
3) Execute the opcode.
4) Traverse back up to the outer-most register window.
5) Check the sentinel, if it's still "-1" store the results.
Otherwise retry the entire sequence.
This retry is extremely troublesome. If you're just unlucky and an
interrupt or other trap happens, it'll push that outer-most window to
the stack and clear the sentinel when we restore it.
We could retry forever and never make forward progress if interrupts
arrive at a fast enough rate (consider perf events as one example).
So we have do limited retries and fallback to software which is
extremely non-deterministic.
Luckily it's very straightforward to provide a mechanism to let
32-bit applications use a 64-bit stack. Stacks in 64-bit mode are
biased by 2047 bytes, which means that the lowest bit is set in the
actual %sp register value.
So if we see bit zero set in a 32-bit application's stack we treat
it like a 64-bit stack.
Runtime detection of such a facility is tricky, and cumbersome at
best. For example, just trying to use a biased stack and seeing if it
works is hard to recover from (the signal handler will need to use an
alt stack, plus something along the lines of longjmp). Therefore, we
add a system call to report a bitmask of arch specific features like
this in a cheap and less hairy way.
With help from Andy Polyakov.
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-27 06:18:37 +08:00
|
|
|
|
|
|
|
|
/* Bitmask values returned from kern_features system call. */
|
|
|
|
|
#define KERN_FEATURE_MIXED_MODE_STACK 0x00000001
|
2012-10-09 16:47:43 +08:00
|
|
|
|
|
|
|
|
#ifdef __32bit_syscall_numbers__
|
|
|
|
|
/* Sparc 32-bit only has the "setresuid32", "getresuid32" variants,
|
|
|
|
|
* it never had the plain ones and there is no value to adding those
|
|
|
|
|
* old versions into the syscall table.
|
|
|
|
|
*/
|
|
|
|
|
#define __IGNORE_setresuid
|
|
|
|
|
#define __IGNORE_getresuid
|
|
|
|
|
#define __IGNORE_setresgid
|
|
|
|
|
#define __IGNORE_getresgid
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#endif /* _UAPI_SPARC_UNISTD_H */
|