401d1f029b
This cleanup patch speeds up the null syscall path on ppc64 by about 3%, and brings the ppc32 and ppc64 code slightly closer together. The ppc64 code was checking current_thread_info()->flags twice in the syscall exit path; once for TIF_SYSCALL_T_OR_A before disabling interrupts, and then again for TIF_SIGPENDING|TIF_NEED_RESCHED etc after disabling interrupts. Now we do the same as ppc32 -- check the flags only once in the fast path, and re-enable interrupts if necessary in the ptrace case. The patch abolishes the 'syscall_noerror' member of struct thread_info and replaces it with a TIF_NOERROR bit in the flags, which is handled in the slow path. This shortens the syscall entry code, which no longer needs to clear syscall_noerror. The patch adds a TIF_SAVE_NVGPRS flag which causes the syscall exit slow path to save the non-volatile GPRs into a signal frame. This removes the need for the assembly wrappers around sys_sigsuspend(), sys_rt_sigsuspend(), et al which existed solely to save those registers in advance. It also means I don't have to add new wrappers for ppoll() and pselect(), which is what I was supposed to be doing when I got distracted into this... Finally, it unifies the ppc64 and ppc32 methods of handling syscall exit directly into a signal handler (as required by sigsuspend et al) by introducing a TIF_RESTOREALL flag which causes _all_ the registers to be reloaded from the pt_regs by taking the ret_from_exception path, instead of the normal syscall exit path which stomps on the callee-saved GPRs. It appears to pass an LTP test run on ppc64, and passes basic testing on ppc32 too. Brief tests of ptrace functionality with strace and gdb also appear OK. I wouldn't send it to Linus for 2.6.15 just yet though :) Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
322 lines
7.4 KiB
ArmAsm
322 lines
7.4 KiB
ArmAsm
/*
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* This file contains the table of syscall-handling functions.
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras.
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*
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* Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
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* PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <asm/ppc_asm.h>
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#ifdef CONFIG_PPC64
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#define SYSCALL(func) .llong .sys_##func,.sys_##func
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#define COMPAT_SYS(func) .llong .sys_##func,.compat_sys_##func
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#define PPC_SYS(func) .llong .ppc_##func,.ppc_##func
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#define OLDSYS(func) .llong .sys_ni_syscall,.sys_ni_syscall
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#define SYS32ONLY(func) .llong .sys_ni_syscall,.compat_sys_##func
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#define SYSX(f, f3264, f32) .llong .f,.f3264
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#else
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#define SYSCALL(func) .long sys_##func
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#define COMPAT_SYS(func) .long sys_##func
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#define PPC_SYS(func) .long ppc_##func
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#define OLDSYS(func) .long sys_##func
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#define SYS32ONLY(func) .long sys_##func
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#define SYSX(f, f3264, f32) .long f32
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#endif
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#ifdef CONFIG_PPC64
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#define sys_sigpending sys_ni_syscall
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#define sys_old_getrlimit sys_ni_syscall
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#else
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#define ppc_rtas sys_ni_syscall
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#endif
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_GLOBAL(sys_call_table)
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SYSCALL(restart_syscall)
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SYSCALL(exit)
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PPC_SYS(fork)
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SYSCALL(read)
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SYSCALL(write)
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COMPAT_SYS(open)
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SYSCALL(close)
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COMPAT_SYS(waitpid)
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COMPAT_SYS(creat)
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SYSCALL(link)
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SYSCALL(unlink)
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COMPAT_SYS(execve)
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SYSCALL(chdir)
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SYSX(sys64_time,compat_sys_time,sys_time)
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SYSCALL(mknod)
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SYSCALL(chmod)
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SYSCALL(lchown)
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SYSCALL(ni_syscall)
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OLDSYS(stat)
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SYSX(sys_lseek,ppc32_lseek,sys_lseek)
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SYSCALL(getpid)
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COMPAT_SYS(mount)
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SYSX(sys_ni_syscall,sys_oldumount,sys_oldumount)
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SYSCALL(setuid)
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SYSCALL(getuid)
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COMPAT_SYS(stime)
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COMPAT_SYS(ptrace)
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SYSCALL(alarm)
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OLDSYS(fstat)
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COMPAT_SYS(pause)
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COMPAT_SYS(utime)
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SYSCALL(ni_syscall)
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SYSCALL(ni_syscall)
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COMPAT_SYS(access)
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COMPAT_SYS(nice)
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SYSCALL(ni_syscall)
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SYSCALL(sync)
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COMPAT_SYS(kill)
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SYSCALL(rename)
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COMPAT_SYS(mkdir)
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SYSCALL(rmdir)
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SYSCALL(dup)
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SYSCALL(pipe)
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COMPAT_SYS(times)
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SYSCALL(ni_syscall)
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SYSCALL(brk)
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SYSCALL(setgid)
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SYSCALL(getgid)
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SYSCALL(signal)
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SYSCALL(geteuid)
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SYSCALL(getegid)
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SYSCALL(acct)
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SYSCALL(umount)
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SYSCALL(ni_syscall)
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COMPAT_SYS(ioctl)
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COMPAT_SYS(fcntl)
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SYSCALL(ni_syscall)
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COMPAT_SYS(setpgid)
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SYSCALL(ni_syscall)
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SYSX(sys_ni_syscall,sys_olduname, sys_olduname)
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COMPAT_SYS(umask)
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SYSCALL(chroot)
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SYSCALL(ustat)
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SYSCALL(dup2)
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SYSCALL(getppid)
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SYSCALL(getpgrp)
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SYSCALL(setsid)
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SYS32ONLY(sigaction)
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SYSCALL(sgetmask)
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COMPAT_SYS(ssetmask)
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SYSCALL(setreuid)
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SYSCALL(setregid)
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SYS32ONLY(sigsuspend)
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COMPAT_SYS(sigpending)
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COMPAT_SYS(sethostname)
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COMPAT_SYS(setrlimit)
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COMPAT_SYS(old_getrlimit)
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COMPAT_SYS(getrusage)
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COMPAT_SYS(gettimeofday)
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COMPAT_SYS(settimeofday)
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COMPAT_SYS(getgroups)
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COMPAT_SYS(setgroups)
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SYSX(sys_ni_syscall,sys_ni_syscall,ppc_select)
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SYSCALL(symlink)
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OLDSYS(lstat)
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COMPAT_SYS(readlink)
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SYSCALL(uselib)
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SYSCALL(swapon)
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SYSCALL(reboot)
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SYSX(sys_ni_syscall,old32_readdir,old_readdir)
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SYSCALL(mmap)
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SYSCALL(munmap)
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SYSCALL(truncate)
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SYSCALL(ftruncate)
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SYSCALL(fchmod)
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SYSCALL(fchown)
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COMPAT_SYS(getpriority)
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COMPAT_SYS(setpriority)
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SYSCALL(ni_syscall)
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COMPAT_SYS(statfs)
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COMPAT_SYS(fstatfs)
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SYSCALL(ni_syscall)
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COMPAT_SYS(socketcall)
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COMPAT_SYS(syslog)
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COMPAT_SYS(setitimer)
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COMPAT_SYS(getitimer)
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COMPAT_SYS(newstat)
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COMPAT_SYS(newlstat)
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COMPAT_SYS(newfstat)
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SYSX(sys_ni_syscall,sys_uname,sys_uname)
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SYSCALL(ni_syscall)
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SYSCALL(vhangup)
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SYSCALL(ni_syscall)
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SYSCALL(ni_syscall)
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COMPAT_SYS(wait4)
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SYSCALL(swapoff)
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COMPAT_SYS(sysinfo)
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COMPAT_SYS(ipc)
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SYSCALL(fsync)
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SYS32ONLY(sigreturn)
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PPC_SYS(clone)
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COMPAT_SYS(setdomainname)
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PPC_SYS(newuname)
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SYSCALL(ni_syscall)
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COMPAT_SYS(adjtimex)
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SYSCALL(mprotect)
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SYSX(sys_ni_syscall,compat_sys_sigprocmask,sys_sigprocmask)
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SYSCALL(ni_syscall)
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SYSCALL(init_module)
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SYSCALL(delete_module)
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SYSCALL(ni_syscall)
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SYSCALL(quotactl)
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COMPAT_SYS(getpgid)
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SYSCALL(fchdir)
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SYSCALL(bdflush)
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COMPAT_SYS(sysfs)
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SYSX(ppc64_personality,ppc64_personality,sys_personality)
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SYSCALL(ni_syscall)
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SYSCALL(setfsuid)
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SYSCALL(setfsgid)
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SYSCALL(llseek)
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COMPAT_SYS(getdents)
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SYSX(sys_select,ppc32_select,ppc_select)
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SYSCALL(flock)
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SYSCALL(msync)
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COMPAT_SYS(readv)
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COMPAT_SYS(writev)
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COMPAT_SYS(getsid)
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SYSCALL(fdatasync)
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COMPAT_SYS(sysctl)
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SYSCALL(mlock)
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SYSCALL(munlock)
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SYSCALL(mlockall)
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SYSCALL(munlockall)
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COMPAT_SYS(sched_setparam)
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COMPAT_SYS(sched_getparam)
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COMPAT_SYS(sched_setscheduler)
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COMPAT_SYS(sched_getscheduler)
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SYSCALL(sched_yield)
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COMPAT_SYS(sched_get_priority_max)
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COMPAT_SYS(sched_get_priority_min)
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COMPAT_SYS(sched_rr_get_interval)
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COMPAT_SYS(nanosleep)
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SYSCALL(mremap)
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SYSCALL(setresuid)
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SYSCALL(getresuid)
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SYSCALL(ni_syscall)
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SYSCALL(poll)
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COMPAT_SYS(nfsservctl)
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SYSCALL(setresgid)
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SYSCALL(getresgid)
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COMPAT_SYS(prctl)
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COMPAT_SYS(rt_sigreturn)
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COMPAT_SYS(rt_sigaction)
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COMPAT_SYS(rt_sigprocmask)
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COMPAT_SYS(rt_sigpending)
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COMPAT_SYS(rt_sigtimedwait)
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COMPAT_SYS(rt_sigqueueinfo)
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COMPAT_SYS(rt_sigsuspend)
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COMPAT_SYS(pread64)
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COMPAT_SYS(pwrite64)
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SYSCALL(chown)
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SYSCALL(getcwd)
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SYSCALL(capget)
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SYSCALL(capset)
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COMPAT_SYS(sigaltstack)
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SYSX(sys_sendfile64,compat_sys_sendfile,sys_sendfile)
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SYSCALL(ni_syscall)
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SYSCALL(ni_syscall)
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PPC_SYS(vfork)
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COMPAT_SYS(getrlimit)
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COMPAT_SYS(readahead)
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SYS32ONLY(mmap2)
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SYS32ONLY(truncate64)
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SYS32ONLY(ftruncate64)
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SYSX(sys_ni_syscall,sys_stat64,sys_stat64)
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SYSX(sys_ni_syscall,sys_lstat64,sys_lstat64)
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SYSX(sys_ni_syscall,sys_fstat64,sys_fstat64)
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COMPAT_SYS(pciconfig_read)
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COMPAT_SYS(pciconfig_write)
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COMPAT_SYS(pciconfig_iobase)
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SYSCALL(ni_syscall)
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SYSCALL(getdents64)
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SYSCALL(pivot_root)
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SYSX(sys_ni_syscall,compat_sys_fcntl64,sys_fcntl64)
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SYSCALL(madvise)
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SYSCALL(mincore)
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SYSCALL(gettid)
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SYSCALL(tkill)
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SYSCALL(setxattr)
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SYSCALL(lsetxattr)
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SYSCALL(fsetxattr)
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SYSCALL(getxattr)
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SYSCALL(lgetxattr)
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SYSCALL(fgetxattr)
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SYSCALL(listxattr)
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SYSCALL(llistxattr)
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SYSCALL(flistxattr)
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SYSCALL(removexattr)
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SYSCALL(lremovexattr)
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SYSCALL(fremovexattr)
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COMPAT_SYS(futex)
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COMPAT_SYS(sched_setaffinity)
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COMPAT_SYS(sched_getaffinity)
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SYSCALL(ni_syscall)
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SYSCALL(ni_syscall)
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SYS32ONLY(sendfile64)
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COMPAT_SYS(io_setup)
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SYSCALL(io_destroy)
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COMPAT_SYS(io_getevents)
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COMPAT_SYS(io_submit)
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SYSCALL(io_cancel)
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SYSCALL(set_tid_address)
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SYSX(sys_fadvise64,ppc32_fadvise64,sys_fadvise64)
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SYSCALL(exit_group)
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SYSX(sys_lookup_dcookie,ppc32_lookup_dcookie,sys_lookup_dcookie)
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SYSCALL(epoll_create)
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SYSCALL(epoll_ctl)
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SYSCALL(epoll_wait)
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SYSCALL(remap_file_pages)
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SYSX(sys_timer_create,ppc32_timer_create,sys_timer_create)
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COMPAT_SYS(timer_settime)
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COMPAT_SYS(timer_gettime)
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SYSCALL(timer_getoverrun)
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SYSCALL(timer_delete)
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COMPAT_SYS(clock_settime)
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COMPAT_SYS(clock_gettime)
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COMPAT_SYS(clock_getres)
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COMPAT_SYS(clock_nanosleep)
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COMPAT_SYS(swapcontext)
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COMPAT_SYS(tgkill)
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COMPAT_SYS(utimes)
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COMPAT_SYS(statfs64)
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COMPAT_SYS(fstatfs64)
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SYSX(sys_ni_syscall, ppc_fadvise64_64, ppc_fadvise64_64)
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PPC_SYS(rtas)
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OLDSYS(debug_setcontext)
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SYSCALL(ni_syscall)
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SYSCALL(ni_syscall)
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COMPAT_SYS(mbind)
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COMPAT_SYS(get_mempolicy)
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COMPAT_SYS(set_mempolicy)
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COMPAT_SYS(mq_open)
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SYSCALL(mq_unlink)
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COMPAT_SYS(mq_timedsend)
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COMPAT_SYS(mq_timedreceive)
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COMPAT_SYS(mq_notify)
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COMPAT_SYS(mq_getsetattr)
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COMPAT_SYS(kexec_load)
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COMPAT_SYS(add_key)
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COMPAT_SYS(request_key)
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COMPAT_SYS(keyctl)
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COMPAT_SYS(waitid)
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COMPAT_SYS(ioprio_set)
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COMPAT_SYS(ioprio_get)
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SYSCALL(inotify_init)
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SYSCALL(inotify_add_watch)
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SYSCALL(inotify_rm_watch)
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