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-rw-r--r--arch/alpha/include/asm/thread_info.h80
-rw-r--r--arch/alpha/kernel/entry.S21
-rw-r--r--arch/alpha/kernel/osf_sys.c31
-rw-r--r--arch/alpha/kernel/process.c51
-rw-r--r--arch/alpha/kernel/signal.c16
-rw-r--r--arch/alpha/kernel/traps.c6
6 files changed, 106 insertions, 99 deletions
diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h
index 4554ecbff7c..1f8c72959fb 100644
--- a/arch/alpha/include/asm/thread_info.h
+++ b/arch/alpha/include/asm/thread_info.h
@@ -7,6 +7,7 @@
#include <asm/processor.h>
#include <asm/types.h>
#include <asm/hwrpb.h>
+#include <asm/sysinfo.h>
#endif
#ifndef __ASSEMBLY__
@@ -21,6 +22,7 @@ struct thread_info {
mm_segment_t addr_limit; /* thread address space */
unsigned cpu; /* current CPU */
int preempt_count; /* 0 => preemptable, <0 => BUG */
+ unsigned int status; /* thread-synchronous flags */
int bpt_nsaved;
unsigned long bpt_addr[2]; /* breakpoint handling */
@@ -63,8 +65,6 @@ register struct thread_info *__current_thread_info __asm__("$8");
* - these are process state flags and used from assembly
* - pending work-to-be-done flags come first and must be assigned to be
* within bits 0 to 7 to fit in and immediate operand.
- * - ALPHA_UAC_SHIFT below must be kept consistent with the unaligned
- * control flags.
*
* TIF_SYSCALL_TRACE is known to be 0 via blbs.
*/
@@ -72,18 +72,12 @@ register struct thread_info *__current_thread_info __asm__("$8");
#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
-#define TIF_POLLING_NRFLAG 8 /* poll_idle is polling NEED_RESCHED */
#define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */
-#define TIF_UAC_NOPRINT 10 /* ! Preserve sequence of following */
-#define TIF_UAC_NOFIX 11 /* ! flags as they match */
-#define TIF_UAC_SIGBUS 12 /* ! userspace part of 'osf_sysinfo' */
#define TIF_MEMDIE 13 /* is terminating due to OOM killer */
-#define TIF_RESTORE_SIGMASK 14 /* restore signal mask in do_signal */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
-#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
/* Work to do on interrupt/exception return. */
@@ -94,29 +88,63 @@ register struct thread_info *__current_thread_info __asm__("$8");
#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
| _TIF_SYSCALL_TRACE)
-#define ALPHA_UAC_SHIFT TIF_UAC_NOPRINT
-#define ALPHA_UAC_MASK (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
- 1 << TIF_UAC_SIGBUS)
+#define TS_UAC_NOPRINT 0x0001 /* ! Preserve the following three */
+#define TS_UAC_NOFIX 0x0002 /* ! flags as they match */
+#define TS_UAC_SIGBUS 0x0004 /* ! userspace part of 'osf_sysinfo' */
+#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */
+#define TS_POLLING 0x0010 /* idle task polling need_resched,
+ skip sending interrupt */
-#define SET_UNALIGN_CTL(task,value) ({ \
- task_thread_info(task)->flags = ((task_thread_info(task)->flags & \
- ~ALPHA_UAC_MASK) \
- | (((value) << ALPHA_UAC_SHIFT) & (1<<TIF_UAC_NOPRINT))\
- | (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
- | (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
+#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
+
+#ifndef __ASSEMBLY__
+#define HAVE_SET_RESTORE_SIGMASK 1
+static inline void set_restore_sigmask(void)
+{
+ struct thread_info *ti = current_thread_info();
+ ti->status |= TS_RESTORE_SIGMASK;
+ WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
+}
+static inline void clear_restore_sigmask(void)
+{
+ current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
+}
+static inline bool test_restore_sigmask(void)
+{
+ return current_thread_info()->status & TS_RESTORE_SIGMASK;
+}
+static inline bool test_and_clear_restore_sigmask(void)
+{
+ struct thread_info *ti = current_thread_info();
+ if (!(ti->status & TS_RESTORE_SIGMASK))
+ return false;
+ ti->status &= ~TS_RESTORE_SIGMASK;
+ return true;
+}
+#endif
+
+#define SET_UNALIGN_CTL(task,value) ({ \
+ __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \
+ if (value & PR_UNALIGN_NOPRINT) \
+ status |= TS_UAC_NOPRINT; \
+ if (value & PR_UNALIGN_SIGBUS) \
+ status |= TS_UAC_SIGBUS; \
+ if (value & 4) /* alpha-specific */ \
+ status |= TS_UAC_NOFIX; \
+ task_thread_info(task)->status = status; \
0; })
#define GET_UNALIGN_CTL(task,value) ({ \
- put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
- >> ALPHA_UAC_SHIFT \
- | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
- >> (ALPHA_UAC_SHIFT + 1) \
- | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
- >> (ALPHA_UAC_SHIFT - 1), \
- (int __user *)(value)); \
+ __u32 status = task_thread_info(task)->status & ~UAC_BITMASK; \
+ __u32 res = 0; \
+ if (status & TS_UAC_NOPRINT) \
+ res |= PR_UNALIGN_NOPRINT; \
+ if (status & TS_UAC_SIGBUS) \
+ res |= PR_UNALIGN_SIGBUS; \
+ if (status & TS_UAC_NOFIX) \
+ res |= 4; \
+ put_user(res, (int __user *)(value)); \
})
-#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
-
#endif /* __KERNEL__ */
#endif /* _ALPHA_THREAD_INFO_H */
diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
index a7607832dd4..c245de65c61 100644
--- a/arch/alpha/kernel/entry.S
+++ b/arch/alpha/kernel/entry.S
@@ -617,7 +617,6 @@ ret_from_kernel_thread:
.ent sys_fork
sys_fork:
.prologue 0
- mov $sp, $21
bsr $1, do_switch_stack
bis $31, SIGCHLD, $16
mov $31, $17
@@ -625,7 +624,9 @@ sys_fork:
mov $31, $19
mov $31, $20
jsr $26, alpha_clone
- bsr $1, undo_switch_stack
+fork_out:
+ ldq $26, 56($sp)
+ lda $sp, SWITCH_STACK_SIZE($sp)
ret
.end sys_fork
@@ -634,12 +635,10 @@ sys_fork:
.ent sys_clone
sys_clone:
.prologue 0
- mov $sp, $21
bsr $1, do_switch_stack
/* $16, $17, $18, $19, $20 come from the user. */
- jsr $26, alpha_clone
- bsr $1, undo_switch_stack
- ret
+ lda $26, fork_out
+ jsr $31, alpha_clone
.end sys_clone
.align 4
@@ -647,11 +646,9 @@ sys_clone:
.ent sys_vfork
sys_vfork:
.prologue 0
- mov $sp, $16
bsr $1, do_switch_stack
- jsr $26, alpha_vfork
- bsr $1, undo_switch_stack
- ret
+ lda $26, fork_out
+ jsr $31, alpha_vfork
.end sys_vfork
.align 4
@@ -661,8 +658,6 @@ sys_sigreturn:
.prologue 0
lda $9, ret_from_straced
cmpult $26, $9, $9
- mov $sp, $17
- lda $18, -SWITCH_STACK_SIZE($sp)
lda $sp, -SWITCH_STACK_SIZE($sp)
jsr $26, do_sigreturn
bne $9, 1f
@@ -678,8 +673,6 @@ sys_rt_sigreturn:
.prologue 0
lda $9, ret_from_straced
cmpult $26, $9, $9
- mov $sp, $17
- lda $18, -SWITCH_STACK_SIZE($sp)
lda $sp, -SWITCH_STACK_SIZE($sp)
jsr $26, do_rt_sigreturn
bne $9, 1f
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 9eb090582cf..14db93e4c8a 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -445,7 +445,7 @@ struct procfs_args {
* unhappy with OSF UFS. [CHECKME]
*/
static int
-osf_ufs_mount(char *dirname, struct ufs_args __user *args, int flags)
+osf_ufs_mount(const char *dirname, struct ufs_args __user *args, int flags)
{
int retval;
struct cdfs_args tmp;
@@ -465,7 +465,7 @@ osf_ufs_mount(char *dirname, struct ufs_args __user *args, int flags)
}
static int
-osf_cdfs_mount(char *dirname, struct cdfs_args __user *args, int flags)
+osf_cdfs_mount(const char *dirname, struct cdfs_args __user *args, int flags)
{
int retval;
struct cdfs_args tmp;
@@ -485,7 +485,7 @@ osf_cdfs_mount(char *dirname, struct cdfs_args __user *args, int flags)
}
static int
-osf_procfs_mount(char *dirname, struct procfs_args __user *args, int flags)
+osf_procfs_mount(const char *dirname, struct procfs_args __user *args, int flags)
{
struct procfs_args tmp;
@@ -793,8 +793,7 @@ SYSCALL_DEFINE5(osf_getsysinfo, unsigned long, op, void __user *, buffer,
case GSI_UACPROC:
if (nbytes < sizeof(unsigned int))
return -EINVAL;
- w = (current_thread_info()->flags >> ALPHA_UAC_SHIFT) &
- UAC_BITMASK;
+ w = current_thread_info()->status & UAC_BITMASK;
if (put_user(w, (unsigned int __user *)buffer))
return -EFAULT;
return 1;
@@ -904,24 +903,20 @@ SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer,
break;
case SSI_NVPAIRS: {
- unsigned long v, w, i;
- unsigned int old, new;
+ unsigned __user *p = buffer;
+ unsigned i;
- for (i = 0; i < nbytes; ++i) {
+ for (i = 0, p = buffer; i < nbytes; ++i, p += 2) {
+ unsigned v, w, status;
- if (get_user(v, 2*i + (unsigned int __user *)buffer))
- return -EFAULT;
- if (get_user(w, 2*i + 1 + (unsigned int __user *)buffer))
+ if (get_user(v, p) || get_user(w, p + 1))
return -EFAULT;
switch (v) {
case SSIN_UACPROC:
- again:
- old = current_thread_info()->flags;
- new = old & ~(UAC_BITMASK << ALPHA_UAC_SHIFT);
- new = new | (w & UAC_BITMASK) << ALPHA_UAC_SHIFT;
- if (cmpxchg(&current_thread_info()->flags,
- old, new) != old)
- goto again;
+ w &= UAC_BITMASK;
+ status = current_thread_info()->status;
+ status = (status & ~UAC_BITMASK) | w;
+ current_thread_info()->status = status;
break;
default:
diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
index 4054e0ffe2b..a4dc79ba030 100644
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -49,7 +49,7 @@ EXPORT_SYMBOL(pm_power_off);
void
cpu_idle(void)
{
- set_thread_flag(TIF_POLLING_NRFLAG);
+ current_thread_info()->status |= TS_POLLING;
while (1) {
/* FIXME -- EV6 and LCA45 know how to power down
@@ -246,19 +246,17 @@ release_thread(struct task_struct *dead_task)
int
alpha_clone(unsigned long clone_flags, unsigned long usp,
int __user *parent_tid, int __user *child_tid,
- unsigned long tls_value, struct pt_regs *regs)
+ unsigned long tls_value)
{
- if (!usp)
- usp = rdusp();
-
- return do_fork(clone_flags, usp, regs, 0, parent_tid, child_tid);
+ return do_fork(clone_flags, usp, current_pt_regs(), 0,
+ parent_tid, child_tid);
}
int
-alpha_vfork(struct pt_regs *regs)
+alpha_vfork(void)
{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(),
- regs, 0, NULL, NULL);
+ return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0,
+ current_pt_regs(), 0, NULL, NULL);
}
/*
@@ -268,18 +266,22 @@ alpha_vfork(struct pt_regs *regs)
int
copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long arg,
- struct task_struct * p, struct pt_regs * regs)
+ struct task_struct *p, struct pt_regs *wontuse)
{
extern void ret_from_fork(void);
extern void ret_from_kernel_thread(void);
struct thread_info *childti = task_thread_info(p);
struct pt_regs *childregs = task_pt_regs(p);
+ struct pt_regs *regs = current_pt_regs();
struct switch_stack *childstack, *stack;
unsigned long settls;
childstack = ((struct switch_stack *) childregs) - 1;
- if (unlikely(!regs)) {
+ childti->pcb.ksp = (unsigned long) childstack;
+ childti->pcb.flags = 1; /* set FEN, clear everything else */
+
+ if (unlikely(p->flags & PF_KTHREAD)) {
/* kernel thread */
memset(childstack, 0,
sizeof(struct switch_stack) + sizeof(struct pt_regs));
@@ -288,12 +290,17 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
childstack->r10 = arg;
childregs->hae = alpha_mv.hae_cache,
childti->pcb.usp = 0;
- childti->pcb.ksp = (unsigned long) childstack;
- childti->pcb.flags = 1; /* set FEN, clear everything else */
return 0;
}
+ /* Note: if CLONE_SETTLS is not set, then we must inherit the
+ value from the parent, which will have been set by the block
+ copy in dup_task_struct. This is non-intuitive, but is
+ required for proper operation in the case of a threaded
+ application calling fork. */
+ if (clone_flags & CLONE_SETTLS)
+ childti->pcb.unique = regs->r20;
+ childti->pcb.usp = usp ?: rdusp();
*childregs = *regs;
- settls = regs->r20;
childregs->r0 = 0;
childregs->r19 = 0;
childregs->r20 = 1; /* OSF/1 has some strange fork() semantics. */
@@ -301,22 +308,6 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
stack = ((struct switch_stack *) regs) - 1;
*childstack = *stack;
childstack->r26 = (unsigned long) ret_from_fork;
- childti->pcb.usp = usp;
- childti->pcb.ksp = (unsigned long) childstack;
- childti->pcb.flags = 1; /* set FEN, clear everything else */
-
- /* Set a new TLS for the child thread? Peek back into the
- syscall arguments that we saved on syscall entry. Oops,
- except we'd have clobbered it with the parent/child set
- of r20. Read the saved copy. */
- /* Note: if CLONE_SETTLS is not set, then we must inherit the
- value from the parent, which will have been set by the block
- copy in dup_task_struct. This is non-intuitive, but is
- required for proper operation in the case of a threaded
- application calling fork. */
- if (clone_flags & CLONE_SETTLS)
- childti->pcb.unique = settls;
-
return 0;
}
diff --git a/arch/alpha/kernel/signal.c b/arch/alpha/kernel/signal.c
index 32575f85507..336393c9c11 100644
--- a/arch/alpha/kernel/signal.c
+++ b/arch/alpha/kernel/signal.c
@@ -160,10 +160,10 @@ extern char compile_time_assert
#define INSN_CALLSYS 0x00000083
static long
-restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
- struct switch_stack *sw)
+restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
{
unsigned long usp;
+ struct switch_stack *sw = (struct switch_stack *)regs - 1;
long i, err = __get_user(regs->pc, &sc->sc_pc);
current_thread_info()->restart_block.fn = do_no_restart_syscall;
@@ -215,9 +215,9 @@ restore_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
registers and transfer control from userland. */
asmlinkage void
-do_sigreturn(struct sigcontext __user *sc, struct pt_regs *regs,
- struct switch_stack *sw)
+do_sigreturn(struct sigcontext __user *sc)
{
+ struct pt_regs *regs = current_pt_regs();
sigset_t set;
/* Verify that it's a good sigcontext before using it */
@@ -228,7 +228,7 @@ do_sigreturn(struct sigcontext __user *sc, struct pt_regs *regs,
set_current_blocked(&set);
- if (restore_sigcontext(sc, regs, sw))
+ if (restore_sigcontext(sc, regs))
goto give_sigsegv;
/* Send SIGTRAP if we're single-stepping: */
@@ -249,9 +249,9 @@ give_sigsegv:
}
asmlinkage void
-do_rt_sigreturn(struct rt_sigframe __user *frame, struct pt_regs *regs,
- struct switch_stack *sw)
+do_rt_sigreturn(struct rt_sigframe __user *frame)
{
+ struct pt_regs *regs = current_pt_regs();
sigset_t set;
/* Verify that it's a good ucontext_t before using it */
@@ -262,7 +262,7 @@ do_rt_sigreturn(struct rt_sigframe __user *frame, struct pt_regs *regs,
set_current_blocked(&set);
- if (restore_sigcontext(&frame->uc.uc_mcontext, regs, sw))
+ if (restore_sigcontext(&frame->uc.uc_mcontext, regs))
goto give_sigsegv;
/* Send SIGTRAP if we're single-stepping: */
diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
index 80d987c0e9a..272666d006d 100644
--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -780,17 +780,17 @@ do_entUnaUser(void __user * va, unsigned long opcode,
/* Check the UAC bits to decide what the user wants us to do
with the unaliged access. */
- if (!test_thread_flag (TIF_UAC_NOPRINT)) {
+ if (!(current_thread_info()->status & TS_UAC_NOPRINT)) {
if (__ratelimit(&ratelimit)) {
printk("%s(%d): unaligned trap at %016lx: %p %lx %ld\n",
current->comm, task_pid_nr(current),
regs->pc - 4, va, opcode, reg);
}
}
- if (test_thread_flag (TIF_UAC_SIGBUS))
+ if ((current_thread_info()->status & TS_UAC_SIGBUS))
goto give_sigbus;
/* Not sure why you'd want to use this, but... */
- if (test_thread_flag (TIF_UAC_NOFIX))
+ if ((current_thread_info()->status & TS_UAC_NOFIX))
return;
/* Don't bother reading ds in the access check since we already
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-02-21 12:41:28 +0000