add m68k port

three ABIs are supported: the default with 68881 80-bit fpu format and
results returned in floating point registers, softfloat-only with the
same format, and coldfire fpu with IEEE single/double only. only the
first is tested at all, and only under qemu which has fpu emulation
bugs.

basic functionality smoke tests have been performed for the most
common arch-specific breakage via libc-test and qemu user-level
emulation. some sysvipc failures remain, but are shared with other big
endian archs and will be fixed separately.

arch/m68k/atomic_arch.h

+#define a_cas a_cas
+static inline int a_cas(volatile int *p, int t, int s)
+{
+	__asm__ __volatile__ (
+		"cas.l %0, %2, (%1)"
+		: "+d"(t) : "a"(p), "d"(s) : "memory", "cc");
+	return t;
+}

arch/m68k/bits/alltypes.h.in

+#define _Addr int
+#define _Int64 long long
+#define _Reg int
+
+TYPEDEF __builtin_va_list va_list;
+TYPEDEF __builtin_va_list __isoc_va_list;
+
+#ifndef __cplusplus
+TYPEDEF long wchar_t;
+#endif
+
+#if __mcffpu__
+TYPEDEF float float_t;
+TYPEDEF double double_t;
+#else
+TYPEDEF long double float_t;
+TYPEDEF long double double_t;
+#endif
+
+TYPEDEF struct { long long __ll; long double __ld; } max_align_t;
+
+TYPEDEF long time_t;
+TYPEDEF long suseconds_t;
+
+TYPEDEF struct { union { int __i[9]; volatile int __vi[9]; unsigned __s[9]; } __u; } pthread_attr_t;
+TYPEDEF struct { union { int __i[6]; volatile int __vi[6]; volatile void *volatile __p[6]; } __u; } pthread_mutex_t;
+TYPEDEF struct { union { int __i[6]; volatile int __vi[6]; volatile void *volatile __p[6]; } __u; } mtx_t;
+TYPEDEF struct { union { int __i[12]; volatile int __vi[12]; void *__p[12]; } __u; } pthread_cond_t;
+TYPEDEF struct { union { int __i[12]; volatile int __vi[12]; void *__p[12]; } __u; } cnd_t;
+TYPEDEF struct { union { int __i[8]; volatile int __vi[8]; void *__p[8]; } __u; } pthread_rwlock_t;
+TYPEDEF struct { union { int __i[5]; volatile int __vi[5]; void *__p[5]; } __u; } pthread_barrier_t;

arch/m68k/bits/endian.h

+#define __BYTE_ORDER __BIG_ENDIAN

arch/m68k/bits/fcntl.h

+#define O_CREAT        0100
+#define O_EXCL         0200
+#define O_NOCTTY       0400
+#define O_TRUNC       01000
+#define O_APPEND      02000
+#define O_NONBLOCK    04000
+#define O_DSYNC      010000
+#define O_SYNC     04010000
+#define O_RSYNC    04010000
+#define O_DIRECTORY  040000
+#define O_NOFOLLOW  0100000
+#define O_CLOEXEC  02000000
+
+#define O_ASYNC      020000
+#define O_DIRECT    0200000
+#define O_LARGEFILE 0400000
+#define O_NOATIME  01000000
+#define O_PATH    010000000
+#define O_TMPFILE 020200000
+#define O_NDELAY O_NONBLOCK
+
+#define F_DUPFD  0
+#define F_GETFD  1
+#define F_SETFD  2
+#define F_GETFL  3
+#define F_SETFL  4
+
+#define F_SETOWN 8
+#define F_GETOWN 9
+#define F_SETSIG 10
+#define F_GETSIG 11
+
+#define F_GETLK 12
+#define F_SETLK 13
+#define F_SETLKW 14
+
+#define F_SETOWN_EX 15
+#define F_GETOWN_EX 16
+
+#define F_GETOWNER_UIDS 17

arch/m68k/bits/fenv.h

+#if __HAVE_68881__ || __mcffpu__
+
+#define FE_INEXACT    8
+#define FE_DIVBYZERO  16
+#define FE_UNDERFLOW  32
+#define FE_OVERFLOW   64
+#define FE_INVALID    128
+
+#define FE_ALL_EXCEPT 0xf8
+
+#define FE_TONEAREST  0
+#define FE_TOWARDZERO 16
+#define FE_DOWNWARD   32
+#define FE_UPWARD     48
+
+#else
+
+#define FE_ALL_EXCEPT 0
+#define FE_TONEAREST  0
+
+#endif
+
+typedef unsigned fexcept_t;
+
+typedef struct {
+	unsigned __control_register, __status_register, __instruction_address;
+} fenv_t;
+
+#define FE_DFL_ENV      ((const fenv_t *) -1)

arch/m68k/bits/float.h

+#if !__mcffpu__
+
+#define FLT_EVAL_METHOD 2
+
+#define LDBL_TRUE_MIN 3.6451995318824746025e-4951L
+#define LDBL_MIN     3.3621031431120935063e-4932L
+#define LDBL_MAX     1.1897314953572317650e+4932L
+#define LDBL_EPSILON 1.0842021724855044340e-19L
+
+#define LDBL_MANT_DIG 64
+#define LDBL_MIN_EXP (-16381)
+#define LDBL_MAX_EXP 16384
+
+#define LDBL_DIG 18
+#define LDBL_MIN_10_EXP (-4931)
+#define LDBL_MAX_10_EXP 4932
+
+#define DECIMAL_DIG 21
+
+#else
+
+#define FLT_EVAL_METHOD 0
+
+#define LDBL_TRUE_MIN 4.94065645841246544177e-324L
+#define LDBL_MIN 2.22507385850720138309e-308L
+#define LDBL_MAX 1.79769313486231570815e+308L
+#define LDBL_EPSILON 2.22044604925031308085e-16L
+
+#define LDBL_MANT_DIG 53
+#define LDBL_MIN_EXP (-1021)
+#define LDBL_MAX_EXP 1024
+
+#define LDBL_DIG 15
+#define LDBL_MIN_10_EXP (-307)
+#define LDBL_MAX_10_EXP 308
+
+#define DECIMAL_DIG 17
+
+#endif

arch/m68k/bits/limits.h

+#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
+ || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#define LONG_BIT 32
+#endif
+
+#define LONG_MAX  0x7fffffffL
+#define LLONG_MAX  0x7fffffffffffffffLL

arch/m68k/bits/posix.h

+#define _POSIX_V6_ILP32_OFFBIG  1
+#define _POSIX_V7_ILP32_OFFBIG  1

arch/m68k/bits/setjmp.h

+typedef unsigned long __jmp_buf[39];

arch/m68k/bits/signal.h

+#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
+ || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+
+#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#define MINSIGSTKSZ 2048
+#define SIGSTKSZ 8192
+#endif
+
+#ifdef _GNU_SOURCE
+enum { R_D0 = 0 };
+#define R_D0 R_D0
+enum { R_D1 = 1 };
+#define R_D1 R_D1
+enum { R_D2 = 2 };
+#define R_D2 R_D2
+enum { R_D3 = 3 };
+#define R_D3 R_D3
+enum { R_D4 = 4 };
+#define R_D4 R_D4
+enum { R_D5 = 5 };
+#define R_D5 R_D5
+enum { R_D6 = 6 };
+#define R_D6 R_D6
+enum { R_D7 = 7 };
+#define R_D7 R_D7
+enum { R_A0 = 8 };
+#define R_A0 R_A0
+enum { R_A1 = 9 };
+#define R_A1 R_A1
+enum { R_A2 = 10 };
+#define R_A2 R_A2
+enum { R_A3 = 11 };
+#define R_A3 R_A3
+enum { R_A4 = 12 };
+#define R_A4 R_A4
+enum { R_A5 = 13 };
+#define R_A5 R_A5
+enum { R_A6 = 14 };
+#define R_A6 R_A6
+enum { R_A7 = 15 };
+#define R_A7 R_A7
+enum { R_SP = 15 };
+#define R_SP R_SP
+enum { R_PC = 16 };
+#define R_PC R_PC
+enum { R_PS = 17 };
+#define R_PS R_PS
+#endif
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+
+struct sigcontext {
+	unsigned long sc_mask, sc_usp, sc_d0, sc_d1, sc_a0, sc_a1;
+	unsigned short sc_sr;
+	unsigned long sc_pc;
+	unsigned short sc_formatvec;
+	unsigned long sc_fpregs[6], sc_fpcntl[3];
+	unsigned char sc_fpstate[216];
+};
+
+typedef int greg_t, gregset_t[18];
+typedef struct {
+	int f_pcr, f_psr, f_fpiaddr, f_fpregs[8][3];
+} fpregset_t;
+
+typedef struct {
+	int version;
+	gregset_t gregs;
+	fpregset_t fpregs;
+} mcontext_t;
+#else
+typedef struct {
+	int __version;
+	int __gregs[18];
+	int __fpregs[27];
+} mcontext_t;
+#endif
+
+struct sigaltstack {
+	void *ss_sp;
+	int ss_flags;
+	size_t ss_size;
+};
+
+typedef struct __ucontext {
+	unsigned long uc_flags;
+	struct __ucontext *uc_link;
+	stack_t uc_stack;
+	mcontext_t uc_mcontext;
+	long __reserved[80];
+	sigset_t uc_sigmask;
+} ucontext_t;
+
+#define SA_NOCLDSTOP  1
+#define SA_NOCLDWAIT  2
+#define SA_SIGINFO    4
+#define SA_ONSTACK    0x08000000
+#define SA_RESTART    0x10000000
+#define SA_NODEFER    0x40000000
+#define SA_RESETHAND  0x80000000
+#define SA_RESTORER   0x04000000
+
+#endif
+
+#define SIGHUP    1
+#define SIGINT    2
+#define SIGQUIT   3
+#define SIGILL    4
+#define SIGTRAP   5
+#define SIGABRT   6
+#define SIGIOT    SIGABRT
+#define SIGBUS    7
+#define SIGFPE    8
+#define SIGKILL   9
+#define SIGUSR1   10
+#define SIGSEGV   11
+#define SIGUSR2   12
+#define SIGPIPE   13
+#define SIGALRM   14
+#define SIGTERM   15
+#define SIGSTKFLT 16
+#define SIGCHLD   17
+#define SIGCONT   18
+#define SIGSTOP   19
+#define SIGTSTP   20
+#define SIGTTIN   21
+#define SIGTTOU   22
+#define SIGURG    23
+#define SIGXCPU   24
+#define SIGXFSZ   25
+#define SIGVTALRM 26
+#define SIGPROF   27
+#define SIGWINCH  28
+#define SIGIO     29
+#define SIGPOLL   29
+#define SIGPWR    30
+#define SIGSYS    31
+#define SIGUNUSED SIGSYS
+
+#define _NSIG 65

arch/m68k/bits/stat.h

+/* copied from kernel definition, but with padding replaced
+ * by the corresponding correctly-sized userspace types. */
+
+struct stat {
+	dev_t st_dev;
+	short __st_dev_padding;
+	long __st_ino_truncated;
+	mode_t st_mode;
+	nlink_t st_nlink;
+	uid_t st_uid;
+	gid_t st_gid;
+	dev_t st_rdev;
+	short __st_rdev_padding;
+	off_t st_size;
+	blksize_t st_blksize;
+	blkcnt_t st_blocks;
+	struct timespec st_atim;
+	struct timespec st_mtim;
+	struct timespec st_ctim;
+	ino_t st_ino;
+};

arch/m68k/bits/stdint.h

+typedef int32_t int_fast16_t;
+typedef int32_t int_fast32_t;
+typedef uint32_t uint_fast16_t;
+typedef uint32_t uint_fast32_t;
+
+#define INT_FAST16_MIN  INT32_MIN
+#define INT_FAST32_MIN  INT32_MIN
+
+#define INT_FAST16_MAX  INT32_MAX
+#define INT_FAST32_MAX  INT32_MAX
+
+#define UINT_FAST16_MAX UINT32_MAX
+#define UINT_FAST32_MAX UINT32_MAX
+
+#define INTPTR_MIN      INT32_MIN
+#define INTPTR_MAX      INT32_MAX
+#define UINTPTR_MAX     UINT32_MAX
+#define PTRDIFF_MIN     INT32_MIN
+#define PTRDIFF_MAX     INT32_MAX
+#define SIZE_MAX        UINT32_MAX

arch/m68k/bits/syscall.h.in

+#define __NR_restart_syscall	  0
+#define __NR_exit		  1
+#define __NR_fork		  2
+#define __NR_read		  3
+#define __NR_write		  4
+#define __NR_open		  5
+#define __NR_close		  6
+#define __NR_waitpid		  7
+#define __NR_creat		  8
+#define __NR_link		  9
+#define __NR_unlink		 10
+#define __NR_execve		 11
+#define __NR_chdir		 12
+#define __NR_time		 13
+#define __NR_mknod		 14
+#define __NR_chmod		 15
+#define __NR_chown		 16
+#define __NR_oldstat		 18
+#define __NR_lseek		 19
+#define __NR_getpid		 20
+#define __NR_mount		 21
+#define __NR_umount		 22
+#define __NR_setuid		 23
+#define __NR_getuid		 24
+#define __NR_stime		 25
+#define __NR_ptrace		 26
+#define __NR_alarm		 27
+#define __NR_oldfstat		 28
+#define __NR_pause		 29
+#define __NR_utime		 30
+#define __NR_access		 33
+#define __NR_nice		 34
+#define __NR_sync		 36
+#define __NR_kill		 37
+#define __NR_rename		 38
+#define __NR_mkdir		 39
+#define __NR_rmdir		 40
+#define __NR_dup		 41
+#define __NR_pipe		 42
+#define __NR_times		 43
+#define __NR_brk		 45
+#define __NR_setgid		 46
+#define __NR_getgid		 47
+#define __NR_signal		 48
+#define __NR_geteuid		 49
+#define __NR_getegid		 50
+#define __NR_acct		 51
+#define __NR_umount2		 52
+#define __NR_ioctl		 54
+#define __NR_fcntl		 55
+#define __NR_setpgid		 57
+#define __NR_umask		 60
+#define __NR_chroot		 61
+#define __NR_ustat		 62
+#define __NR_dup2		 63
+#define __NR_getppid		 64
+#define __NR_getpgrp		 65
+#define __NR_setsid		 66
+#define __NR_sigaction		 67
+#define __NR_sgetmask		 68
+#define __NR_ssetmask		 69
+#define __NR_setreuid		 70
+#define __NR_setregid		 71
+#define __NR_sigsuspend		 72
+#define __NR_sigpending		 73
+#define __NR_sethostname	 74
+#define __NR_setrlimit		 75
+#define __NR_getrlimit		 76
+#define __NR_getrusage		 77
+#define __NR_gettimeofday	 78
+#define __NR_settimeofday	 79
+#define __NR_getgroups		 80
+#define __NR_setgroups		 81
+#define __NR_select		 82
+#define __NR_symlink		 83
+#define __NR_oldlstat		 84
+#define __NR_readlink		 85
+#define __NR_uselib		 86
+#define __NR_swapon		 87
+#define __NR_reboot		 88
+#define __NR_readdir		 89
+#define __NR_mmap		 90
+#define __NR_munmap		 91
+#define __NR_truncate		 92
+#define __NR_ftruncate		 93
+#define __NR_fchmod		 94
+#define __NR_fchown		 95
+#define __NR_getpriority	 96
+#define __NR_setpriority	 97
+#define __NR_statfs		 99
+#define __NR_fstatfs		100
+#define __NR_socketcall		102
+#define __NR_syslog		103
+#define __NR_setitimer		104
+#define __NR_getitimer		105
+#define __NR_stat		106
+#define __NR_lstat		107
+#define __NR_fstat		108
+#define __NR_vhangup		111
+#define __NR_wait4		114
+#define __NR_swapoff		115
+#define __NR_sysinfo		116
+#define __NR_ipc		117
+#define __NR_fsync		118
+#define __NR_sigreturn		119
+#define __NR_clone		120
+#define __NR_setdomainname	121
+#define __NR_uname		122
+#define __NR_cacheflush		123
+#define __NR_adjtimex		124
+#define __NR_mprotect		125
+#define __NR_sigprocmask	126
+#define __NR_create_module	127
+#define __NR_init_module	128
+#define __NR_delete_module	129
+#define __NR_get_kernel_syms	130
+#define __NR_quotactl		131
+#define __NR_getpgid		132
+#define __NR_fchdir		133
+#define __NR_bdflush		134
+#define __NR_sysfs		135
+#define __NR_personality	136
+#define __NR_setfsuid		138
+#define __NR_setfsgid		139
+#define __NR__llseek		140
+#define __NR_getdents		141
+#define __NR__newselect		142
+#define __NR_flock		143
+#define __NR_msync		144
+#define __NR_readv		145
+#define __NR_writev		146
+#define __NR_getsid		147
+#define __NR_fdatasync		148
+#define __NR__sysctl		149
+#define __NR_mlock		150
+#define __NR_munlock		151
+#define __NR_mlockall		152
+#define __NR_munlockall		153
+#define __NR_sched_setparam		154
+#define __NR_sched_getparam		155
+#define __NR_sched_setscheduler		156
+#define __NR_sched_getscheduler		157
+#define __NR_sched_yield		158
+#define __NR_sched_get_priority_max	159
+#define __NR_sched_get_priority_min	160
+#define __NR_sched_rr_get_interval	161
+#define __NR_nanosleep		162
+#define __NR_mremap		163
+#define __NR_setresuid		164
+#define __NR_getresuid		165
+#define __NR_getpagesize	166
+#define __NR_query_module	167
+#define __NR_poll		168
+#define __NR_nfsservctl		169
+#define __NR_setresgid		170
+#define __NR_getresgid		171
+#define __NR_prctl		172
+#define __NR_rt_sigreturn	173
+#define __NR_rt_sigaction	174
+#define __NR_rt_sigprocmask	175
+#define __NR_rt_sigpending	176
+#define __NR_rt_sigtimedwait	177
+#define __NR_rt_sigqueueinfo	178
+#define __NR_rt_sigsuspend	179
+#define __NR_pread64		180
+#define __NR_pwrite64		181
+#define __NR_lchown		182
+#define __NR_getcwd		183
+#define __NR_capget		184
+#define __NR_capset		185
+#define __NR_sigaltstack	186
+#define __NR_sendfile		187
+#define __NR_getpmsg		188
+#define __NR_putpmsg		189
+#define __NR_vfork		190
+#define __NR_ugetrlimit		191
+#define __NR_mmap2		192
+#define __NR_truncate64		193
+#define __NR_ftruncate64	194
+#define __NR_stat64		195
+#define __NR_lstat64		196
+#define __NR_fstat64		197
+#define __NR_chown32		198
+#define __NR_getuid32		199
+#define __NR_getgid32		200
+#define __NR_geteuid32		201
+#define __NR_getegid32		202
+#define __NR_setreuid32		203
+#define __NR_setregid32		204
+#define __NR_getgroups32	205
+#define __NR_setgroups32	206
+#define __NR_fchown32		207
+#define __NR_setresuid32	208
+#define __NR_getresuid32	209
+#define __NR_setresgid32	210
+#define __NR_getresgid32	211
+#define __NR_lchown32		212
+#define __NR_setuid32		213
+#define __NR_setgid32		214
+#define __NR_setfsuid32		215
+#define __NR_setfsgid32		216
+#define __NR_pivot_root		217
+#define __NR_getdents64		220
+#define __NR_gettid		221
+#define __NR_tkill		222
+#define __NR_setxattr		223
+#define __NR_lsetxattr		224
+#define __NR_fsetxattr		225
+#define __NR_getxattr		226
+#define __NR_lgetxattr		227
+#define __NR_fgetxattr		228
+#define __NR_listxattr		229
+#define __NR_llistxattr		230
+#define __NR_flistxattr		231
+#define __NR_removexattr	232
+#define __NR_lremovexattr	233
+#define __NR_fremovexattr	234
+#define __NR_futex		235
+#define __NR_sendfile64		236
+#define __NR_mincore		237
+#define __NR_madvise		238
+#define __NR_fcntl64		239
+#define __NR_readahead		240
+#define __NR_io_setup		241
+#define __NR_io_destroy		242
+#define __NR_io_getevents	243
+#define __NR_io_submit		244
+#define __NR_io_cancel		245
+#define __NR_fadvise64		246
+#define __NR_exit_group		247
+#define __NR_lookup_dcookie	248
+#define __NR_epoll_create	249
+#define __NR_epoll_ctl		250
+#define __NR_epoll_wait		251
+#define __NR_remap_file_pages	252
+#define __NR_set_tid_address	253
+#define __NR_timer_create	254
+#define __NR_timer_settime	255
+#define __NR_timer_gettime	256
+#define __NR_timer_getoverrun	257
+#define __NR_timer_delete	258
+#define __NR_clock_settime	259
+#define __NR_clock_gettime	260
+#define __NR_clock_getres	261
+#define __NR_clock_nanosleep	262
+#define __NR_statfs64		263
+#define __NR_fstatfs64		264
+#define __NR_tgkill		265
+#define __NR_utimes		266
+#define __NR_fadvise64_64	267
+#define __NR_mbind		268
+#define __NR_get_mempolicy	269
+#define __NR_set_mempolicy	270
+#define __NR_mq_open		271
+#define __NR_mq_unlink		272
+#define __NR_mq_timedsend	273
+#define __NR_mq_timedreceive	274
+#define __NR_mq_notify		275
+#define __NR_mq_getsetattr	276
+#define __NR_waitid		277
+#define __NR_add_key		279
+#define __NR_request_key	280
+#define __NR_keyctl		281
+#define __NR_ioprio_set		282
+#define __NR_ioprio_get		283
+#define __NR_inotify_init	284
+#define __NR_inotify_add_watch	285
+#define __NR_inotify_rm_watch	286
+#define __NR_migrate_pages	287
+#define __NR_openat		288
+#define __NR_mkdirat		289
+#define __NR_mknodat		290
+#define __NR_fchownat		291
+#define __NR_futimesat		292
+#define __NR_fstatat64		293
+#define __NR_unlinkat		294
+#define __NR_renameat		295
+#define __NR_linkat		296
+#define __NR_symlinkat		297
+#define __NR_readlinkat		298
+#define __NR_fchmodat		299
+#define __NR_faccessat		300
+#define __NR_pselect6		301
+#define __NR_ppoll		302
+#define __NR_unshare		303
+#define __NR_set_robust_list	304
+#define __NR_get_robust_list	305
+#define __NR_splice		306
+#define __NR_sync_file_range	307
+#define __NR_tee		308
+#define __NR_vmsplice		309
+#define __NR_move_pages		310
+#define __NR_sched_setaffinity	311
+#define __NR_sched_getaffinity	312
+#define __NR_kexec_load		313
+#define __NR_getcpu		314
+#define __NR_epoll_pwait	315
+#define __NR_utimensat		316
+#define __NR_signalfd		317
+#define __NR_timerfd_create	318
+#define __NR_eventfd		319
+#define __NR_fallocate		320
+#define __NR_timerfd_settime	321
+#define __NR_timerfd_gettime	322
+#define __NR_signalfd4		323
+#define __NR_eventfd2		324
+#define __NR_epoll_create1	325
+#define __NR_dup3		326
+#define __NR_pipe2		327
+#define __NR_inotify_init1	328
+#define __NR_preadv		329
+#define __NR_pwritev		330
+#define __NR_rt_tgsigqueueinfo	331
+#define __NR_perf_event_open	332
+#define __NR_get_thread_area	333
+#define __NR_set_thread_area	334
+#define __NR_atomic_cmpxchg_32	335
+#define __NR_atomic_barrier	336
+#define __NR_fanotify_init	337
+#define __NR_fanotify_mark	338
+#define __NR_prlimit64		339
+#define __NR_name_to_handle_at	340
+#define __NR_open_by_handle_at	341
+#define __NR_clock_adjtime	342
+#define __NR_syncfs		343
+#define __NR_setns		344
+#define __NR_process_vm_readv	345
+#define __NR_process_vm_writev	346
+#define __NR_kcmp		347
+#define __NR_finit_module	348
+#define __NR_sched_setattr	349
+#define __NR_sched_getattr	350
+#define __NR_renameat2		351
+#define __NR_getrandom		352
+#define __NR_memfd_create	353
+#define __NR_bpf		354
+#define __NR_execveat		355
+#define __NR_socket		356
+#define __NR_socketpair		357
+#define __NR_bind		358
+#define __NR_connect		359
+#define __NR_listen		360
+#define __NR_accept4		361
+#define __NR_getsockopt		362
+#define __NR_setsockopt		363
+#define __NR_getsockname	364
+#define __NR_getpeername	365
+#define __NR_sendto		366
+#define __NR_sendmsg		367
+#define __NR_recvfrom		368
+#define __NR_recvmsg		369
+#define __NR_shutdown		370
+#define __NR_recvmmsg		371
+#define __NR_sendmmsg		372
+#define __NR_userfaultfd	373
+#define __NR_membarrier		374
+#define __NR_mlock2		375
+#define __NR_copy_file_range	376
+#define __NR_preadv2		377
+#define __NR_pwritev2		378
+#define __NR_statx		379

arch/m68k/crt_arch.h

+__asm__(
+".text\n"
+".weak _DYNAMIC \n"
+".hidden _DYNAMIC \n"
+".global " START "\n"
+START ":\n"
+"	suba.l %fp,%fp \n"
+"	movea.l %sp,%a0 \n"
+"	lea _DYNAMIC-.-8,%a1 \n"
+"	pea (%pc,%a1) \n"
+"	pea (%a0) \n"
+"	lea " START "_c-.-8,%a1 \n"
+"	jsr (%pc,%a1) \n"
+);

arch/m68k/pthread_arch.h

+static inline struct pthread *__pthread_self()
+{
+	uintptr_t tp = __syscall(SYS_get_thread_area);
+	return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));
+}
+
+#define TLS_ABOVE_TP
+#define GAP_ABOVE_TP 0
+#define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) + 0x7000)
+
+#define DTP_OFFSET 0x8000
+
+#define MC_PC gregs[R_PC]

arch/m68k/reloc.h

+#if __HAVE_68881__
+#define FP_SUFFIX ""
+#elif __mcffpu__
+#define FP_SUFFIX "-fp64"
+#else
+#define FP_SUFFIX "-sf"
+#endif
+
+#define LDSO_ARCH "m68k" FP_SUFFIX
+
+#define TPOFF_K (-0x7000)
+
+#define REL_SYMBOLIC    R_68K_32
+#define REL_OFFSET      R_68K_PC32
+#define REL_GOT         R_68K_GLOB_DAT
+#define REL_PLT         R_68K_JMP_SLOT
+#define REL_RELATIVE    R_68K_RELATIVE
+#define REL_COPY        R_68K_COPY
+#define REL_DTPMOD      R_68K_TLS_DTPMOD32
+#define REL_DTPOFF      R_68K_TLS_DTPREL32
+#define REL_TPOFF       R_68K_TLS_TPREL32
+
+#define CRTJMP(pc,sp) __asm__ __volatile__( \
+	"move.l %1,%%sp ; jmp (%0)" : : "r"(pc), "r"(sp) : "memory" )
+
+#define GETFUNCSYM(fp, sym, got) __asm__ ( \
+	".hidden " #sym "\n" \
+	"lea " #sym "-.-8,%0 \n" \
+	"lea (%%pc,%0),%0 \n" \
+	: "=a"(*fp) : : "memory" )

arch/m68k/syscall_arch.h

+#define __SYSCALL_LL_E(x) \
+((union { long long ll; long l[2]; }){ .ll = x }).l[0], \
+((union { long long ll; long l[2]; }){ .ll = x }).l[1]
+#define __SYSCALL_LL_O(x) __SYSCALL_LL_E((x))
+
+static __inline long __syscall0(long n)
+{
+	register unsigned long d0 __asm__("d0") = n;
+	__asm__ __volatile__ ("trap #0" : "+r"(d0)
+		:
+		: "memory");
+	return d0;
+}
+
+static inline long __syscall1(long n, long a)
+{
+	register unsigned long d0 __asm__("d0") = n;
+	register unsigned long d1 __asm__("d1") = a;
+	__asm__ __volatile__ ("trap #0" : "+r"(d0)
+		: "r"(d1)
+		: "memory");
+	return d0;
+}
+
+static inline long __syscall2(long n, long a, long b)
+{
+	register unsigned long d0 __asm__("d0") = n;
+	register unsigned long d1 __asm__("d1") = a;
+	register unsigned long d2 __asm__("d2") = b;
+	__asm__ __volatile__ ("trap #0" : "+r"(d0)
+		: "r"(d1), "r"(d2)
+		: "memory");
+	return d0;
+}
+
+static inline long __syscall3(long n, long a, long b, long c)
+{
+	register unsigned long d0 __asm__("d0") = n;
+	register unsigned long d1 __asm__("d1") = a;
+	register unsigned long d2 __asm__("d2") = b;
+	register unsigned long d3 __asm__("d3") = c;
+	__asm__ __volatile__ ("trap #0" : "+r"(d0)
+		: "r"(d1), "r"(d2), "r"(d3)
+		: "memory");
+	return d0;
+}
+
+static inline long __syscall4(long n, long a, long b, long c, long d)
+{
+	register unsigned long d0 __asm__("d0") = n;
+	register unsigned long d1 __asm__("d1") = a;
+	register unsigned long d2 __asm__("d2") = b;
+	register unsigned long d3 __asm__("d3") = c;
+	register unsigned long d4 __asm__("d4") = d;
+	__asm__ __volatile__ ("trap #0" : "+r"(d0)
+		: "r"(d1), "r"(d2), "r"(d3), "r"(d4)
+		: "memory");
+	return d0;
+}
+
+static inline long __syscall5(long n, long a, long b, long c, long d, long e)
+{
+	register unsigned long d0 __asm__("d0") = n;
+	register unsigned long d1 __asm__("d1") = a;
+	register unsigned long d2 __asm__("d2") = b;
+	register unsigned long d3 __asm__("d3") = c;
+	register unsigned long d4 __asm__("d4") = d;
+	register unsigned long d5 __asm__("d5") = e;
+	__asm__ __volatile__ ("trap #0" : "+r"(d0)
+		: "r"(d1), "r"(d2), "r"(d3), "r"(d4), "r"(d5)
+		: "memory");
+	return d0;
+}
+
+static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
+{
+	register unsigned long d0 __asm__("d0") = n;
+	register unsigned long d1 __asm__("d1") = a;
+	register unsigned long d2 __asm__("d2") = b;
+	register unsigned long d3 __asm__("d3") = c;
+	register unsigned long d4 __asm__("d4") = d;
+	register unsigned long d5 __asm__("d5") = e;
+	register unsigned long a0 __asm__("a0") = f;
+	__asm__ __volatile__ ("trap #0" : "+r"(d0)
+		: "r"(d1), "r"(d2), "r"(d3), "r"(d4), "r"(d5), "r"(a0)
+		: "memory");
+	return d0;
+}
+
+#define SYSCALL_USE_SOCKETCALL

configure

@@ -320,6 +320,7 @@ i?86*) ARCH=i386 ;;
 x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;;
 x86_64-nt64*) ARCH=nt64 ;;
 x86_64*) ARCH=x86_64 ;;
+m68k*) ARCH=m68k ;;
 mips64*|mipsisa64*) ARCH=mips64 ;;
 mips*) ARCH=mips ;;
 microblaze*) ARCH=microblaze ;;
@@ -641,6 +642,13 @@ if test "$ARCH" = "aarch64" ; then
 trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be
 fi
 
+if test "$ARCH" = "m68k" ; then
+if trycppif "__HAVE_68881__" ; then : ;
+elif trycppif "__mcffpu__" ; then SUBARCH="-fp64"
+else SUBARCH="-sf"
+fi
+fi
+
 if test "$ARCH" = "mips" ; then
 trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6
 trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el

src/fenv/m68k/fenv.c

+#include <fenv.h>
+
+#if __HAVE_68881__ || __mcffpu__
+
+static unsigned getsr()
+{
+	unsigned v;
+	__asm__ __volatile__ ("fmove.l %%fpsr,%0" : "=dm"(v));
+	return v;
+}
+
+static void setsr(unsigned v)
+{
+	__asm__ __volatile__ ("fmove.l %0,%%fpsr" : : "dm"(v));
+}
+
+static unsigned getcr()
+{
+	unsigned v;
+	__asm__ __volatile__ ("fmove.l %%fpcr,%0" : "=dm"(v));
+	return v;
+}
+
+static void setcr(unsigned v)
+{
+	__asm__ __volatile__ ("fmove.l %0,%%fpcr" : : "dm"(v));
+}
+
+int feclearexcept(int mask)
+{
+	if (mask & ~FE_ALL_EXCEPT) return -1;
+	setsr(getsr() & ~mask);
+	return 0;
+}
+
+int feraiseexcept(int mask)
+{
+	if (mask & ~FE_ALL_EXCEPT) return -1;
+	setsr(getsr() | mask);
+	return 0;
+}
+
+int fetestexcept(int mask)
+{
+	return getsr() & mask;
+}
+
+int fegetround(void)
+{
+	return getcr() & FE_UPWARD;
+}
+
+int __fesetround(int r)
+{
+	setcr((getcr() & ~FE_UPWARD) | r);
+	return 0;
+}
+
+int fegetenv(fenv_t *envp)
+{
+	envp->__control_register = getcr();
+	envp->__status_register = getsr();
+	__asm__ __volatile__ ("fmove.l %%fpiar,%0"
+		: "=dm"(envp->__instruction_address));
+	return 0;
+}
+
+int fesetenv(const fenv_t *envp)
+{
+	static const fenv_t default_env = { 0 };
+	if (envp == FE_DFL_ENV)
+		envp = &default_env;
+	setcr(envp->__control_register);
+	setsr(envp->__status_register);
+	__asm__ __volatile__ ("fmove.l %0,%%fpiar"
+		: : "dm"(envp->__instruction_address));
+	return 0;
+}
+
+#else
+
+#include "../fenv.c"
+
+#endif

src/internal/m68k/syscall.s

+.global __syscall
+.hidden __syscall
+.type __syscall,%function
+__syscall:
+	movem.l %d2-%d5,-(%sp)
+	movem.l 20(%sp),%d0-%d5/%a0
+	trap #0
+	movem.l (%sp)+,%d2-%d5
+	rts

src/ldso/m68k/dlsym.s

+.text
+.global dlsym
+.hidden __dlsym
+.type dlsym,@function
+dlsym:
+	move.l (%sp),-(%sp)
+	move.l 12(%sp),-(%sp)
+	move.l 12(%sp),-(%sp)
+	lea __dlsym-.-8,%a1
+	jsr (%pc,%a1)
+	add.l #12,%sp
+	rts

src/setjmp/m68k/longjmp.s

+.global _longjmp
+.global longjmp
+.type _longjmp,@function
+.type longjmp,@function
+_longjmp:
+longjmp:
+	movea.l 4(%sp),%a0
+	move.l 8(%sp),%d0
+	bne 1f
+	move.l #1,%d0
+1:	movem.l (%a0),%d2-%d7/%a2-%a7
+	fmovem.x 52(%a0),%fp2-%fp7
+	move.l 48(%a0),(%sp)
+	rts

src/setjmp/m68k/setjmp.s

+.global ___setjmp
+.hidden ___setjmp
+.global __setjmp
+.global _setjmp
+.global setjmp
+.type __setjmp,@function
+.type _setjmp,@function
+.type setjmp,@function
+___setjmp:
+__setjmp:
+_setjmp:
+setjmp:
+	movea.l 4(%sp),%a0
+	movem.l %d2-%d7/%a2-%a7,(%a0)
+	move.l (%sp),48(%a0)
+	fmovem.x %fp2-%fp7,52(%a0)
+	clr.l %d0
+	rts

src/signal/m68k/sigsetjmp.s

+.global sigsetjmp
+.global __sigsetjmp
+.type sigsetjmp,@function
+.type __sigsetjmp,@function
+sigsetjmp:
+__sigsetjmp:
+	move.l 8(%sp),%d0
+	beq 1f
+
+	movea.l 4(%sp),%a1
+	move.l (%sp)+,156(%a1)
+	move.l %a2,156+4+8(%a1)
+	movea.l %a1,%a2
+
+.hidden ___setjmp
+	lea ___setjmp-.-8,%a1
+	jsr (%pc,%a1)
+
+	move.l 156(%a2),-(%sp)
+	move.l %a2,4(%sp)
+	move.l %d0,8(%sp)
+	movea.l 156+4+8(%a2),%a2
+
+.hidden __sigsetjmp_tail
+	lea __sigsetjmp_tail-.-8,%a1
+	jmp (%pc,%a1)
+
+1:	lea ___setjmp-.-8,%a1
+	jmp (%pc,%a1)

src/thread/m68k/__m68k_read_tp.s

+.text
+.global __m68k_read_tp
+.type   __m68k_read_tp,@function
+__m68k_read_tp:
+	move.l #333,%d0
+	trap #0
+	move.l %d0,%a0
+	rts

src/thread/m68k/clone.s

+.text
+.global __clone
+.type   __clone,@function
+__clone:
+	movem.l %d2-%d5,-(%sp)
+	move.l #120,%d0
+	move.l 28(%sp),%d1
+	move.l 24(%sp),%d2
+	and.l #-16,%d2
+	move.l 36(%sp),%d3
+	move.l 44(%sp),%d4
+	move.l 40(%sp),%d5
+	move.l 20(%sp),%a0
+	move.l 32(%sp),%a1
+	trap #0
+	tst.l %d0
+	beq 1f
+	movem.l (%sp)+,%d2-%d5
+	rts
+1:	move.l %a1,-(%sp)
+	jsr (%a0)
+	move.l #1,%d0
+	trap #0
+	clr.b 0

src/thread/m68k/syscall_cp.s

+.text
+.global __cp_begin
+.hidden __cp_begin
+.global __cp_end
+.hidden __cp_end
+.global __cp_cancel
+.hidden __cp_cancel
+.hidden __cancel
+.global __syscall_cp_asm
+.hidden __syscall_cp_asm
+.type   __syscall_cp_asm,@function
+__syscall_cp_asm:
+	movem.l %d2-%d5,-(%sp)
+	movea.l 20(%sp),%a0
+__cp_begin:
+	move.l (%a0),%d0
+	bne __cp_cancel
+	movem.l 24(%sp),%d0-%d5/%a0
+	trap #0
+__cp_end:
+	movem.l (%sp)+,%d2-%d5
+	rts
+__cp_cancel:
+	movem.l (%sp)+,%d2-%d5
+	move.l __cancel-.-8,%a1
+	jmp (%pc,%a1)