Commit 90785be3 authored by Linus Torvalds's avatar Linus Torvalds

Merge branch 'alpha' (alpha architecture patches)

Merge alpha architecture update from Michael Cree:
 "The Alpha Maintainer, Matt Turner, is currently unavailable, so I have
  collected up patches that have been posted to the linux-alpha mailing
  list over the last couple of months, and are forwarding them to you in
  the hope that you are prepared to accept them via me.

  The patches by Al Viro and myself I have been running against kernels
  for two months now so have had quite a bit of testing.  All except one
  patch were intended for the 3.5 kernel but because of Matt's
  unavailability never got forwarded to you."

* emailed patches from Michael Cree <mcree@orcon.net.nz>: (9 commits)
  alpha: Fix fall-out from disintegrating asm/system.h
  Redefine ATOMIC_INIT and ATOMIC64_INIT to drop the casts
  alpha: fix fpu.h usage in userspace
  alpha/mm/fault.c: Port OOM changes to do_page_fault
  alpha: take kernel_execve() out of entry.S
  alpha: take a bunch of syscalls into osf_sys.c
  alpha: Use new generic strncpy_from_user() and strnlen_user()
  alpha: Wire up cross memory attach syscalls
  alpha: Don't export SOCK_NONBLOCK to user space.
parents 6dab7ede d1b5153f
......@@ -18,6 +18,8 @@ config ALPHA
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select GENERIC_SMP_IDLE_THREAD
select GENERIC_CMOS_UPDATE
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
help
The Alpha is a 64-bit general-purpose processor designed and
marketed by the Digital Equipment Corporation of blessed memory,
......
......@@ -14,8 +14,8 @@
*/
#define ATOMIC_INIT(i) ( (atomic_t) { (i) } )
#define ATOMIC64_INIT(i) ( (atomic64_t) { (i) } )
#define ATOMIC_INIT(i) { (i) }
#define ATOMIC64_INIT(i) { (i) }
#define atomic_read(v) (*(volatile int *)&(v)->counter)
#define atomic64_read(v) (*(volatile long *)&(v)->counter)
......
#ifndef __ASM_ALPHA_FPU_H
#define __ASM_ALPHA_FPU_H
#ifdef __KERNEL__
#include <asm/special_insns.h>
#endif
/*
* Alpha floating-point control register defines:
......
......@@ -76,7 +76,10 @@ struct switch_stack {
#define task_pt_regs(task) \
((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)
#define force_successful_syscall_return() (task_pt_regs(current)->r0 = 0)
#define current_pt_regs() \
((struct pt_regs *) ((char *)current_thread_info() + 2*PAGE_SIZE) - 1)
#define force_successful_syscall_return() (current_pt_regs()->r0 = 0)
#endif
......
......@@ -76,9 +76,11 @@
/* Instruct lower device to use last 4-bytes of skb data as FCS */
#define SO_NOFCS 43
#ifdef __KERNEL__
/* O_NONBLOCK clashes with the bits used for socket types. Therefore we
* have to define SOCK_NONBLOCK to a different value here.
*/
#define SOCK_NONBLOCK 0x40000000
#endif /* __KERNEL__ */
#endif /* _ASM_SOCKET_H */
......@@ -433,36 +433,12 @@ clear_user(void __user *to, long len)
#undef __module_address
#undef __module_call
/* Returns: -EFAULT if exception before terminator, N if the entire
buffer filled, else strlen. */
#define user_addr_max() \
(segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL)
extern long __strncpy_from_user(char *__to, const char __user *__from, long __to_len);
extern inline long
strncpy_from_user(char *to, const char __user *from, long n)
{
long ret = -EFAULT;
if (__access_ok((unsigned long)from, 0, get_fs()))
ret = __strncpy_from_user(to, from, n);
return ret;
}
/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
extern long __strlen_user(const char __user *);
extern inline long strlen_user(const char __user *str)
{
return access_ok(VERIFY_READ,str,0) ? __strlen_user(str) : 0;
}
/* Returns: 0 if exception before NUL or reaching the supplied limit (N),
* a value greater than N if the limit would be exceeded, else strlen. */
extern long __strnlen_user(const char __user *, long);
extern inline long strnlen_user(const char __user *str, long n)
{
return access_ok(VERIFY_READ,str,0) ? __strnlen_user(str, n) : 0;
}
extern long strncpy_from_user(char *dest, const char __user *src, long count);
extern __must_check long strlen_user(const char __user *str);
extern __must_check long strnlen_user(const char __user *str, long n);
/*
* About the exception table:
......
......@@ -465,10 +465,12 @@
#define __NR_setns 501
#define __NR_accept4 502
#define __NR_sendmmsg 503
#define __NR_process_vm_readv 504
#define __NR_process_vm_writev 505
#ifdef __KERNEL__
#define NR_SYSCALLS 504
#define NR_SYSCALLS 506
#define __ARCH_WANT_OLD_READDIR
#define __ARCH_WANT_STAT64
......
#ifndef _ASM_WORD_AT_A_TIME_H
#define _ASM_WORD_AT_A_TIME_H
#include <asm/compiler.h>
/*
* word-at-a-time interface for Alpha.
*/
/*
* We do not use the word_at_a_time struct on Alpha, but it needs to be
* implemented to humour the generic code.
*/
struct word_at_a_time {
const unsigned long unused;
};
#define WORD_AT_A_TIME_CONSTANTS { 0 }
/* Return nonzero if val has a zero */
static inline unsigned long has_zero(unsigned long val, unsigned long *bits, const struct word_at_a_time *c)
{
unsigned long zero_locations = __kernel_cmpbge(0, val);
*bits = zero_locations;
return zero_locations;
}
static inline unsigned long prep_zero_mask(unsigned long val, unsigned long bits, const struct word_at_a_time *c)
{
return bits;
}
#define create_zero_mask(bits) (bits)
static inline unsigned long find_zero(unsigned long bits)
{
#if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67)
/* Simple if have CIX instructions */
return __kernel_cttz(bits);
#else
unsigned long t1, t2, t3;
/* Retain lowest set bit only */
bits &= -bits;
/* Binary search for lowest set bit */
t1 = bits & 0xf0;
t2 = bits & 0xcc;
t3 = bits & 0xaa;
if (t1) t1 = 4;
if (t2) t2 = 2;
if (t3) t3 = 1;
return t1 + t2 + t3;
#endif
}
#endif /* _ASM_WORD_AT_A_TIME_H */
......@@ -52,7 +52,6 @@ EXPORT_SYMBOL(alpha_write_fp_reg_s);
/* entry.S */
EXPORT_SYMBOL(kernel_thread);
EXPORT_SYMBOL(kernel_execve);
/* Networking helper routines. */
EXPORT_SYMBOL(csum_tcpudp_magic);
......@@ -74,8 +73,6 @@ EXPORT_SYMBOL(alpha_fp_emul);
*/
EXPORT_SYMBOL(__copy_user);
EXPORT_SYMBOL(__do_clear_user);
EXPORT_SYMBOL(__strncpy_from_user);
EXPORT_SYMBOL(__strnlen_user);
/*
* SMP-specific symbols.
......
......@@ -663,58 +663,6 @@ kernel_thread:
br ret_to_kernel
.end kernel_thread
/*
* kernel_execve(path, argv, envp)
*/
.align 4
.globl kernel_execve
.ent kernel_execve
kernel_execve:
/* We can be called from a module. */
ldgp $gp, 0($27)
lda $sp, -(32+SIZEOF_PT_REGS+8)($sp)
.frame $sp, 32+SIZEOF_PT_REGS+8, $26, 0
stq $26, 0($sp)
stq $16, 8($sp)
stq $17, 16($sp)
stq $18, 24($sp)
.prologue 1
lda $16, 32($sp)
lda $17, 0
lda $18, SIZEOF_PT_REGS
bsr $26, memset !samegp
/* Avoid the HAE being gratuitously wrong, which would cause us
to do the whole turn off interrupts thing and restore it. */
ldq $2, alpha_mv+HAE_CACHE
stq $2, 152+32($sp)
ldq $16, 8($sp)
ldq $17, 16($sp)
ldq $18, 24($sp)
lda $19, 32($sp)
bsr $26, do_execve !samegp
ldq $26, 0($sp)
bne $0, 1f /* error! */
/* Move the temporary pt_regs struct from its current location
to the top of the kernel stack frame. See copy_thread for
details for a normal process. */
lda $16, 0x4000 - SIZEOF_PT_REGS($8)
lda $17, 32($sp)
lda $18, SIZEOF_PT_REGS
bsr $26, memmove !samegp
/* Take that over as our new stack frame and visit userland! */
lda $sp, 0x4000 - SIZEOF_PT_REGS($8)
br $31, ret_from_sys_call
1: lda $sp, 32+SIZEOF_PT_REGS+8($sp)
ret
.end kernel_execve
/*
* Special system calls. Most of these are special in that they either
......@@ -796,115 +744,6 @@ sys_rt_sigreturn:
br ret_from_sys_call
.end sys_rt_sigreturn
.align 4
.globl sys_sethae
.ent sys_sethae
sys_sethae:
.prologue 0
stq $16, 152($sp)
ret
.end sys_sethae
.align 4
.globl osf_getpriority
.ent osf_getpriority
osf_getpriority:
lda $sp, -16($sp)
stq $26, 0($sp)
.prologue 0
jsr $26, sys_getpriority
ldq $26, 0($sp)
blt $0, 1f
/* Return value is the unbiased priority, i.e. 20 - prio.
This does result in negative return values, so signal
no error by writing into the R0 slot. */
lda $1, 20
stq $31, 16($sp)
subl $1, $0, $0
unop
1: lda $sp, 16($sp)
ret
.end osf_getpriority
.align 4
.globl sys_getxuid
.ent sys_getxuid
sys_getxuid:
.prologue 0
ldq $2, TI_TASK($8)
ldq $3, TASK_CRED($2)
ldl $0, CRED_UID($3)
ldl $1, CRED_EUID($3)
stq $1, 80($sp)
ret
.end sys_getxuid
.align 4
.globl sys_getxgid
.ent sys_getxgid
sys_getxgid:
.prologue 0
ldq $2, TI_TASK($8)
ldq $3, TASK_CRED($2)
ldl $0, CRED_GID($3)
ldl $1, CRED_EGID($3)
stq $1, 80($sp)
ret
.end sys_getxgid
.align 4
.globl sys_getxpid
.ent sys_getxpid
sys_getxpid:
.prologue 0
ldq $2, TI_TASK($8)
/* See linux/kernel/timer.c sys_getppid for discussion
about this loop. */
ldq $3, TASK_GROUP_LEADER($2)
ldq $4, TASK_REAL_PARENT($3)
ldl $0, TASK_TGID($2)
1: ldl $1, TASK_TGID($4)
#ifdef CONFIG_SMP
mov $4, $5
mb
ldq $3, TASK_GROUP_LEADER($2)
ldq $4, TASK_REAL_PARENT($3)
cmpeq $4, $5, $5
beq $5, 1b
#endif
stq $1, 80($sp)
ret
.end sys_getxpid
.align 4
.globl sys_alpha_pipe
.ent sys_alpha_pipe
sys_alpha_pipe:
lda $sp, -16($sp)
stq $26, 0($sp)
.prologue 0
mov $31, $17
lda $16, 8($sp)
jsr $26, do_pipe_flags
ldq $26, 0($sp)
bne $0, 1f
/* The return values are in $0 and $20. */
ldl $1, 12($sp)
ldl $0, 8($sp)
stq $1, 80+16($sp)
1: lda $sp, 16($sp)
ret
.end sys_alpha_pipe
.align 4
.globl sys_execve
.ent sys_execve
......
......@@ -1404,3 +1404,52 @@ SYSCALL_DEFINE3(osf_writev, unsigned long, fd,
}
#endif
SYSCALL_DEFINE2(osf_getpriority, int, which, int, who)
{
int prio = sys_getpriority(which, who);
if (prio >= 0) {
/* Return value is the unbiased priority, i.e. 20 - prio.
This does result in negative return values, so signal
no error */
force_successful_syscall_return();
prio = 20 - prio;
}
return prio;
}
SYSCALL_DEFINE0(getxuid)
{
current_pt_regs()->r20 = sys_geteuid();
return sys_getuid();
}
SYSCALL_DEFINE0(getxgid)
{
current_pt_regs()->r20 = sys_getegid();
return sys_getgid();
}
SYSCALL_DEFINE0(getxpid)
{
current_pt_regs()->r20 = sys_getppid();
return sys_getpid();
}
SYSCALL_DEFINE0(alpha_pipe)
{
int fd[2];
int res = do_pipe_flags(fd, 0);
if (!res) {
/* The return values are in $0 and $20. */
current_pt_regs()->r20 = fd[1];
res = fd[0];
}
return res;
}
SYSCALL_DEFINE1(sethae, unsigned long, val)
{
current_pt_regs()->hae = val;
return 0;
}
......@@ -455,3 +455,22 @@ get_wchan(struct task_struct *p)
}
return pc;
}
int kernel_execve(const char *path, const char *const argv[], const char *const envp[])
{
/* Avoid the HAE being gratuitously wrong, which would cause us
to do the whole turn off interrupts thing and restore it. */
struct pt_regs regs = {.hae = alpha_mv.hae_cache};
int err = do_execve(path, argv, envp, &regs);
if (!err) {
struct pt_regs *p = current_pt_regs();
/* copy regs to normal position and off to userland we go... */
*p = regs;
__asm__ __volatile__ (
"mov %0, $sp;"
"br $31, ret_from_sys_call"
: : "r"(p));
}
return err;
}
EXPORT_SYMBOL(kernel_execve);
......@@ -111,7 +111,7 @@ sys_call_table:
.quad sys_socket
.quad sys_connect
.quad sys_accept
.quad osf_getpriority /* 100 */
.quad sys_osf_getpriority /* 100 */
.quad sys_send
.quad sys_recv
.quad sys_sigreturn
......@@ -522,6 +522,8 @@ sys_call_table:
.quad sys_setns
.quad sys_accept4
.quad sys_sendmmsg
.quad sys_process_vm_readv
.quad sys_process_vm_writev /* 505 */
.size sys_call_table, . - sys_call_table
.type sys_call_table, @object
......
......@@ -31,8 +31,6 @@ lib-y = __divqu.o __remqu.o __divlu.o __remlu.o \
$(ev6-y)memchr.o \
$(ev6-y)copy_user.o \
$(ev6-y)clear_user.o \
$(ev6-y)strncpy_from_user.o \
$(ev67-y)strlen_user.o \
$(ev6-y)csum_ipv6_magic.o \
$(ev6-y)clear_page.o \
$(ev6-y)copy_page.o \
......
This diff is collapsed.
/*
* arch/alpha/lib/ev67-strlen_user.S
* 21264 version contributed by Rick Gorton <rick.gorton@api-networks.com>
*
* Return the length of the string including the NULL terminator
* (strlen+1) or zero if an error occurred.
*
* In places where it is critical to limit the processing time,
* and the data is not trusted, strnlen_user() should be used.
* It will return a value greater than its second argument if
* that limit would be exceeded. This implementation is allowed
* to access memory beyond the limit, but will not cross a page
* boundary when doing so.
*
* Much of the information about 21264 scheduling/coding comes from:
* Compiler Writer's Guide for the Alpha 21264
* abbreviated as 'CWG' in other comments here
* ftp.digital.com/pub/Digital/info/semiconductor/literature/dsc-library.html
* Scheduling notation:
* E - either cluster
* U - upper subcluster; U0 - subcluster U0; U1 - subcluster U1
* L - lower subcluster; L0 - subcluster L0; L1 - subcluster L1
* Try not to change the actual algorithm if possible for consistency.
*/
#include <asm/regdef.h>
/* Allow an exception for an insn; exit if we get one. */
#define EX(x,y...) \
99: x,##y; \
.section __ex_table,"a"; \
.long 99b - .; \
lda v0, $exception-99b(zero); \
.previous
.set noreorder
.set noat
.text
.globl __strlen_user
.ent __strlen_user
.frame sp, 0, ra
.align 4
__strlen_user:
ldah a1, 32767(zero) # do not use plain strlen_user() for strings
# that might be almost 2 GB long; you should
# be using strnlen_user() instead
nop
nop
nop
.globl __strnlen_user
.align 4
__strnlen_user:
.prologue 0
EX( ldq_u t0, 0(a0) ) # L : load first quadword (a0 may be misaligned)
lda t1, -1(zero) # E :
insqh t1, a0, t1 # U :
andnot a0, 7, v0 # E :
or t1, t0, t0 # E :
subq a0, 1, a0 # E : get our +1 for the return
cmpbge zero, t0, t1 # E : t1 <- bitmask: bit i == 1 <==> i-th byte == 0
subq a1, 7, t2 # E :
subq a0, v0, t0 # E :
bne t1, $found # U :
addq t2, t0, t2 # E :
addq a1, 1, a1 # E :
nop # E :
nop # E :
.align 4
$loop: ble t2, $limit # U :
EX( ldq t0, 8(v0) ) # L :
nop # E :
nop # E :
cmpbge zero, t0, t1 # E :
subq t2, 8, t2 # E :
addq v0, 8, v0 # E : addr += 8
beq t1, $loop # U :
$found: cttz t1, t2 # U0 :
addq v0, t2, v0 # E :
subq v0, a0, v0 # E :
ret # L0 :
$exception:
nop
nop
nop
ret
.align 4 # currently redundant
$limit:
nop
nop
subq a1, t2, v0
ret
.end __strlen_user
/*
* arch/alpha/lib/strlen_user.S
*
* Return the length of the string including the NUL terminator
* (strlen+1) or zero if an error occurred.
*
* In places where it is critical to limit the processing time,
* and the data is not trusted, strnlen_user() should be used.
* It will return a value greater than its second argument if
* that limit would be exceeded. This implementation is allowed
* to access memory beyond the limit, but will not cross a page
* boundary when doing so.
*/
#include <asm/regdef.h>
/* Allow an exception for an insn; exit if we get one. */
#define EX(x,y...) \
99: x,##y; \
.section __ex_table,"a"; \
.long 99b - .; \
lda v0, $exception-99b(zero); \
.previous
.set noreorder
.set noat
.text
.globl __strlen_user
.ent __strlen_user
.frame sp, 0, ra
.align 3
__strlen_user:
ldah a1, 32767(zero) # do not use plain strlen_user() for strings
# that might be almost 2 GB long; you should
# be using strnlen_user() instead
.globl __strnlen_user
.align 3
__strnlen_user:
.prologue 0
EX( ldq_u t0, 0(a0) ) # load first quadword (a0 may be misaligned)
lda t1, -1(zero)
insqh t1, a0, t1
andnot a0, 7, v0
or t1, t0, t0
subq a0, 1, a0 # get our +1 for the return
cmpbge zero, t0, t1 # t1 <- bitmask: bit i == 1 <==> i-th byte == 0
subq a1, 7, t2
subq a0, v0, t0
bne t1, $found
addq t2, t0, t2
addq a1, 1, a1
.align 3
$loop: ble t2, $limit
EX( ldq t0, 8(v0) )
subq t2, 8, t2
addq v0, 8, v0 # addr += 8
cmpbge zero, t0, t1
beq t1, $loop
$found: negq t1, t2 # clear all but least set bit
and t1, t2, t1
and t1, 0xf0, t2 # binary search for that set bit
and t1, 0xcc, t3
and t1, 0xaa, t4
cmovne t2, 4, t2
cmovne t3, 2, t3
cmovne t4, 1, t4
addq t2, t3, t2
addq v0, t4, v0
addq v0, t2, v0
nop # dual issue next two on ev4 and ev5
subq v0, a0, v0
$exception:
ret
.align 3 # currently redundant
$limit:
subq a1, t2, v0
ret
.end __strlen_user
This diff is collapsed.
......@@ -89,6 +89,8 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
const struct exception_table_entry *fixup;
int fault, si_code = SEGV_MAPERR;
siginfo_t info;
unsigned int flags = (FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE |
(cause > 0 ? FAULT_FLAG_WRITE : 0));
/* As of EV6, a load into $31/$f31 is a prefetch, and never faults
(or is suppressed by the PALcode). Support that for older CPUs
......@@ -114,6 +116,7 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
goto vmalloc_fault;
#endif
retry:
down_read(&mm->mmap_sem);
vma = find_vma(mm, address);
if (!vma)
......@@ -144,8 +147,11 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
/* If for any reason at all we couldn't handle the fault,
make sure we exit gracefully rather than endlessly redo
the fault. */
fault = handle_mm_fault(mm, vma, address, cause > 0 ? FAULT_FLAG_WRITE : 0);
up_read(&mm->mmap_sem);
fault = handle_mm_fault(mm, vma, address, flags);
if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
return;
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
......@@ -153,10 +159,26 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
goto do_sigbus;
BUG();
}
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
if (fault & VM_FAULT_RETRY) {
flags &= ~FAULT_FLAG_ALLOW_RETRY;
/* No need to up_read(&mm->mmap_sem) as we would
* have already released it in __lock_page_or_retry
* in mm/filemap.c.
*/
goto retry;
}
}
up_read(&mm->mmap_sem);
return;
/* Something tried to access memory that isn't in our memory map.
......@@ -186,12 +208,14 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
/* We ran out of memory, or some other thing happened to us that
made us unable to handle the page fault gracefully. */
out_of_memory:
up_read(&mm->mmap_sem);
if (!user_mode(regs))
goto no_context;
pagefault_out_of_memory();
return;
do_sigbus:
up_read(&mm->mmap_sem);
/* Send a sigbus, regardless of whether we were in kernel
or user mode. */
info.si_signo = SIGBUS;
......
......@@ -12,6 +12,7 @@
#include <linux/smp.h>
#include <linux/errno.h>
#include <asm/ptrace.h>
#include <asm/special_insns.h>
#include "op_impl.h"
......
......@@ -1407,13 +1407,6 @@ SYSCALL_DEFINE1(alarm, unsigned int, seconds)
#endif
#ifndef __alpha__
/*
* The Alpha uses getxpid, getxuid, and getxgid instead. Maybe this
* should be moved into arch/i386 instead?
*/
/**
* sys_getpid - return the thread group id of the current process
*
......@@ -1469,8 +1462,6 @@ SYSCALL_DEFINE0(getegid)
return from_kgid_munged(current_user_ns(), current_egid());
}
#endif
static void process_timeout(unsigned long __data)
{
wake_up_process((struct task_struct *)__data);
......
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