[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 6

The attached patches provides part 6 of an architecture implementation for the
Tensilica Xtensa CPU series.

Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 537 insertions, 0 deletions

diff --git a/include/asm-xtensa/unistd.h b/include/asm-xtensa/unistd.h
new file mode 100644
index 000000000000..64c64dd83ba4
--- /dev/null
+++ b/include/asm-xtensa/unistd.h
@@ -0,0 +1,537 @@
+/*
+ * include/asm-xtensa/unistd.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_UNISTD_H
+#define _XTENSA_UNISTD_H
+
+#include <linux/linkage.h>
+
+//#define __NR_setup              0 /* used only by init, to get system going */
+#define __NR_spill                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_lchown              16
+#define __NR_break               17
+#define __NR_oldstat             18
+#define __NR_lseek               19
+#define __NR_getpid              20
+#define __NR_mount               21
+#define __NR_oldumount           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_stty                31
+#define __NR_gtty                32
+#define __NR_access              33
+#define __NR_nice                34
+#define __NR_ftime               35
+#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_prof                44
+#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_umount              52
+#define __NR_lock                53
+#define __NR_ioctl               54
+#define __NR_fcntl               55
+#define __NR_mpx                 56
+#define __NR_setpgid             57
+#define __NR_ulimit              58
+#define __NR_oldolduname         59
+#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     /* Back compatible 2Gig limited rlimit */
+#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_profil              98
+#define __NR_statfs              99
+#define __NR_fstatfs            100
+#define __NR_ioperm             101
+#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_olduname           109
+#define __NR_iopl               110
+#define __NR_vhangup            111
+#define __NR_idle               112
+#define __NR_vm86               113
+#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_modify_ldt         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_afs_syscall        137 /* Syscall for Andrew File System */
+#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_cacheflush         147
+#define __NR_cachectl           148
+#define __NR_sysxtensa          149
+#define __NR_sysdummy           150
+#define __NR_getsid             151
+#define __NR_fdatasync          152
+#define __NR__sysctl            153
+#define __NR_mlock              154
+#define __NR_munlock            155
+#define __NR_mlockall           156
+#define __NR_munlockall         157
+#define __NR_sched_setparam             158
+#define __NR_sched_getparam             159
+#define __NR_sched_setscheduler         160
+#define __NR_sched_getscheduler         161
+#define __NR_sched_yield                162
+#define __NR_sched_get_priority_max     163
+#define __NR_sched_get_priority_min     164
+#define __NR_sched_rr_get_interval      165
+#define __NR_nanosleep          166
+#define __NR_mremap             167
+#define __NR_accept             168
+#define __NR_bind               169
+#define __NR_connect            170
+#define __NR_getpeername        171
+#define __NR_getsockname        172
+#define __NR_getsockopt         173
+#define __NR_listen             174
+#define __NR_recv               175
+#define __NR_recvfrom           176
+#define __NR_recvmsg            177
+#define __NR_send               178
+#define __NR_sendmsg            179
+#define __NR_sendto             180
+#define __NR_setsockopt         181
+#define __NR_shutdown           182
+#define __NR_socket             183
+#define __NR_socketpair         184
+#define __NR_setresuid          185
+#define __NR_getresuid          186
+#define __NR_query_module       187
+#define __NR_poll               188
+#define __NR_nfsservctl         189
+#define __NR_setresgid          190
+#define __NR_getresgid          191
+#define __NR_prctl              192
+#define __NR_rt_sigreturn       193
+#define __NR_rt_sigaction       194
+#define __NR_rt_sigprocmask     195
+#define __NR_rt_sigpending      196
+#define __NR_rt_sigtimedwait    197
+#define __NR_rt_sigqueueinfo    198
+#define __NR_rt_sigsuspend      199
+#define __NR_pread              200
+#define __NR_pwrite             201
+#define __NR_chown              202
+#define __NR_getcwd             203
+#define __NR_capget             204
+#define __NR_capset             205
+#define __NR_sigaltstack        206
+#define __NR_sendfile           207
+#define __NR_streams1           208     /* some people actually want it */
+#define __NR_streams2           209     /* some people actually want it */
+#define __NR_mmap2              210
+#define __NR_truncate64         211
+#define __NR_ftruncate64        212
+#define __NR_stat64             213
+#define __NR_lstat64            214
+#define __NR_fstat64            215
+#define __NR_pivot_root         216
+#define __NR_mincore            217
+#define __NR_madvise            218
+#define __NR_getdents64         219
+#define __NR_vfork              220
+
+/* Keep this last; should always equal the last valid call number. */
+#define __NR_Linux_syscalls     220
+
+/* user-visible error numbers are in the range -1 - -125: see
+ * <asm-xtensa/errno.h> */
+
+#define SYSXTENSA_RESERVED         0    /* don't use this */
+#define SYSXTENSA_ATOMIC_SET       1    /* set variable */
+#define SYSXTENSA_ATOMIC_EXG_ADD   2    /* exchange memory and add */
+#define SYSXTENSA_ATOMIC_ADD       3    /* add to memory */
+#define SYSXTENSA_ATOMIC_CMP_SWP   4    /* compare and swap */
+
+#define SYSXTENSA_COUNT            5    /* count of syscall0 functions*/
+
+#ifdef __KERNEL__
+#define __syscall_return(type, res) return ((type)(res))
+#else
+#define __syscall_return(type, res) \
+do { \
+        if ((unsigned long)(res) >= (unsigned long)(-125)) { \
+        /* Avoid using "res" which is declared to be in register r2; \
+         * errno might expand to a function call and clobber it.  */ \
+                int __err = -(res); \
+                errno = __err; \
+                res = -1; \
+        } \
+        return (type) (res); \
+} while (0)
+#endif
+
+
+/* Tensilica's xt-xcc compiler is much more agressive at code
+ * optimization than gcc.  Multiple __asm__ statements are
+ * insufficient for xt-xcc because subsequent optimization passes
+ * (beyond the front-end that knows of __asm__ statements and other
+ * such GNU Extensions to C) can modify the register selection for
+ * containment of C variables.
+ *
+ * xt-xcc cannot modify the contents of a single __asm__ statement, so
+ * we create single-asm versions of the syscall macros that are
+ * suitable and optimal for both xt-xcc and gcc.
+ *
+ * Linux takes system-call arguments in registers.  The following
+ * design is optimized for user-land apps (e.g., glibc) which
+ * typically have a function wrapper around the "syscall" assembly
+ * instruction.  It satisfies the Xtensa ABI while minizing argument
+ * shifting.
+ *
+ * The Xtensa ABI and software conventions require the system-call
+ * number in a2.  If an argument exists in a2, we move it to the next
+ * available register.  Note that for improved efficiency, we do NOT
+ * shift all parameters down one register to maintain the original
+ * order.
+ *
+ * At best case (zero arguments), we just write the syscall number to
+ * a2.  At worst case (1 to 6 arguments), we move the argument in a2
+ * to the next available register, then write the syscall number to
+ * a2.
+ *
+ * For clarity, the following truth table enumerates all possibilities.
+ *
+ * arguments    syscall number  arg0, arg1, arg2, arg3, arg4, arg5
+ * ---------    --------------  ----------------------------------
+ *      0             a2
+ *      1             a2        a3
+ *      2             a2        a4,   a3
+ *      3             a2        a5,   a3,   a4
+ *      4             a2        a6,   a3,   a4,   a5
+ *      5             a2        a7,   a3,   a4,   a5,   a6
+ *      6             a2        a8,   a3,   a4,   a5,   a6,   a7
+ */
+
+#define _syscall0(type,name) \
+type name(void) \
+{ \
+long __res; \
+__asm__ __volatile__ ( \
+        "  movi  a2, %1 \n" \
+        "  syscall      \n" \
+        "  mov   %0, a2 \n" \
+        : "=a" (__res) \
+        : "i" (__NR_##name) \
+        : "a2" \
+        ); \
+__syscall_return(type,__res); \
+}
+
+#define _syscall1(type,name,type0,arg0) \
+type name(type0 arg0) \
+{ \
+long __res; \
+__asm__ __volatile__ ( \
+        "  mov   a3, %2 \n" \
+        "  movi  a2, %1 \n" \
+        "  syscall      \n" \
+        "  mov   %0, a2 \n" \
+        : "=a" (__res) \
+        : "i" (__NR_##name), "a" (arg0) \
+        : "a2", "a3" \
+        ); \
+__syscall_return(type,__res); \
+}
+
+#define _syscall2(type,name,type0,arg0,type1,arg1) \
+type name(type0 arg0,type1 arg1) \
+{ \
+long __res; \
+__asm__ __volatile__ ( \
+        "  mov   a4, %2 \n" \
+        "  mov   a3, %3 \n" \
+        "  movi  a2, %1 \n" \
+        "  syscall      \n" \
+        "  mov   %0, a2 \n" \
+        : "=a" (__res) \
+        : "i" (__NR_##name), "a" (arg0), "a" (arg1) \
+        : "a2", "a3", "a4" \
+        ); \
+__syscall_return(type,__res); \
+}
+
+#define _syscall3(type,name,type0,arg0,type1,arg1,type2,arg2) \
+type name(type0 arg0,type1 arg1,type2 arg2) \
+{ \
+long __res; \
+__asm__ __volatile__ ( \
+        "  mov   a5, %2 \n" \
+        "  mov   a4, %4 \n" \
+        "  mov   a3, %3 \n" \
+        "  movi  a2, %1 \n" \
+        "  syscall      \n" \
+        "  mov   %0, a2 \n" \
+        : "=a" (__res) \
+        : "i" (__NR_##name), "a" (arg0), "a" (arg1), "a" (arg2) \
+        : "a2", "a3", "a4", "a5" \
+        ); \
+__syscall_return(type,__res); \
+}
+
+#define _syscall4(type,name,type0,arg0,type1,arg1,type2,arg2,type3,arg3) \
+type name(type0 arg0,type1 arg1,type2 arg2,type3 arg3) \
+{ \
+long __res; \
+__asm__ __volatile__ ( \
+        "  mov   a6, %2 \n" \
+        "  mov   a5, %5 \n" \
+        "  mov   a4, %4 \n" \
+        "  mov   a3, %3 \n" \
+        "  movi  a2, %1 \n" \
+        "  syscall      \n" \
+        "  mov   %0, a2 \n" \
+        : "=a" (__res) \
+        : "i" (__NR_##name), "a" (arg0), "a" (arg1), "a" (arg2), "a" (arg3) \
+        : "a2", "a3", "a4", "a5", "a6" \
+        ); \
+__syscall_return(type,__res); \
+}
+
+/* Note that we save and restore the a7 frame pointer.
+ * Including a7 in the clobber list doesn't do what you'd expect.
+ */
+#define _syscall5(type,name,type0,arg0,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
+type name(type0 arg0,type1 arg1,type2 arg2,type3 arg3,type4 arg4) \
+{ \
+long __res; \
+__asm__ __volatile__ ( \
+        "  mov   a9, a7 \n" \
+        "  mov   a7, %2 \n" \
+        "  mov   a6, %6 \n" \
+        "  mov   a5, %5 \n" \
+        "  mov   a4, %4 \n" \
+        "  mov   a3, %3 \n" \
+        "  movi  a2, %1 \n" \
+        "  syscall      \n" \
+        "  mov   a7, a9 \n" \
+        "  mov   %0, a2 \n" \
+        : "=a" (__res) \
+        : "i" (__NR_##name), "a" (arg0), "a" (arg1), "a" (arg2), \
+                             "a" (arg3), "a" (arg4) \
+        : "a2", "a3", "a4", "a5", "a6", "a9" \
+        ); \
+__syscall_return(type,__res); \
+}
+
+/* Note that we save and restore the a7 frame pointer.
+ * Including a7 in the clobber list doesn't do what you'd expect.
+ */
+#define _syscall6(type,name,type0,arg0,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5) \
+type name(type0 arg0,type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5) \
+{ \
+long __res; \
+__asm__ __volatile__ ( \
+        "  mov   a9, a7 \n" \
+        "  mov   a8, %2 \n" \
+        "  mov   a7, %7 \n" \
+        "  mov   a6, %6 \n" \
+        "  mov   a5, %5 \n" \
+        "  mov   a4, %4 \n" \
+        "  mov   a3, %3 \n" \
+        "  movi  a2, %1 \n" \
+        "  syscall      \n" \
+        "  mov   a7, a9 \n" \
+        "  mov   %0, a2 \n" \
+        : "=a" (__res) \
+        : "i" (__NR_##name), "a" (arg0), "a" (arg1), "a" (arg2), \
+                             "a" (arg3), "a" (arg4), "a" (arg5)  \
+        : "a2", "a3", "a4", "a5", "a6", "a8", "a9" \
+        ); \
+__syscall_return(type,__res); \
+}
+
+
+#ifdef __KERNEL_SYSCALLS__
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <linux/syscalls.h>
+
+/*
+ * we need this inline - forking from kernel space will result
+ * in NO COPY ON WRITE (!!!), until an execve is executed. This
+ * is no problem, but for the stack. This is handled by not letting
+ * main() use the stack at all after fork(). Thus, no function
+ * calls - which means inline code for fork too, as otherwise we
+ * would use the stack upon exit from 'fork()'.
+ *
+ * Actually only pause and fork are needed inline, so that there
+ * won't be any messing with the stack from main(), but we define
+ * some others too.
+ */
+
+#define __NR__exit __NR_exit
+
+static __inline__ _syscall0(int,pause)
+//static __inline__ _syscall1(int,setup,int,magic) FIXME
+static __inline__ _syscall0(int,sync)
+static __inline__ _syscall0(pid_t,setsid)
+static __inline__ _syscall3(int,write,int,fd,const char *,buf,off_t,count)
+static __inline__ _syscall3(int,read,int,fd,char *,buf,off_t,count)
+static __inline__ _syscall3(off_t,lseek,int,fd,off_t,offset,int,count)
+static __inline__ _syscall1(int,dup,int,fd)
+static __inline__ _syscall3(int,execve,const char*,file,char**,argv,char**,envp)
+static __inline__ _syscall3(int,open,const char *,file,int,flag,int,mode)
+static __inline__ _syscall1(int,close,int,fd)
+static __inline__ _syscall1(int,_exit,int,exitcode)
+static __inline__ _syscall3(pid_t,waitpid,pid_t,pid,int *,wait_stat,int,options)
+static __inline__ _syscall1(int,delete_module,const char *,name)
+
+struct stat;
+static __inline__ _syscall2(int,fstat,int,fd,struct stat *,buf)
+static __inline__ _syscall0(pid_t,getpid)
+static __inline__ _syscall2(int,kill,int,pid,int,sig)
+static __inline__ _syscall2(int,stat,const char *, path,struct stat *,buf)
+static __inline__ _syscall1(int,unlink,char *,pathname)
+
+
+
+extern pid_t waitpid(int, int*, int );
+static __inline__ pid_t wait(int * wait_stat)
+{
+        return waitpid(-1,wait_stat,0);
+}
+#endif
+
+/*
+ * "Conditional" syscalls
+ *
+ * What we want is __attribute__((weak,alias("sys_ni_syscall"))),
+ * but it doesn't work on all toolchains, so we just do it by hand
+ */
+#define cond_syscall(x) asm(".weak\t" #x "\n\t.set\t" #x ",sys_ni_syscall");
+
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#define __ARCH_WANT_SYS_RT_SIGACTION
+#endif
+
+
+
+#endif  /* _XTENSA_UNISTD_H */