[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>
diff --git a/include/asm-xtensa/unistd.h b/include/asm-xtensa/unistd.h
new file mode 100644
index 0000000..64c64dd
--- /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 */