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[PATCH] m68k: convert thread flags to use bit fields 

Remove task_work structure, use the standard thread flags functions and use
shifts in entry.S to test the thread flags.  Add a few local labels to entry.S
to allow gas to generate short jumps.

Finally it changes a number of inline functions in thread_info.h to macros to
delay the current_thread_info() usage, which requires on m68k a structure
(task_struct) not yet defined at this point.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Cc: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Roman Zippel 2005-11-13 16:06:59 -08:00 committed by Linus Torvalds
parent abd03753bd
commit 3b66a1edb0
8 changed files with 71 additions and 177 deletions
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6
arch/m68k/fpsp040/skeleton.S
View File

@ -381,10 +381,8 @@ fpsp_done:
.Lnotkern:
SAVE_ALL_INT
GET_CURRENT(%d0)
tstb %curptr@(TASK_NEEDRESCHED)
jne ret_from_exception | deliver signals,
| reschedule etc..
RESTORE_ALL
| deliver signals, reschedule etc..
jra ret_from_exception
|
| mem_write --- write to user or supervisor address space

6
arch/m68k/ifpsp060/iskeleton.S
View File

@ -75,10 +75,8 @@ _060_isp_done:
.Lnotkern:
SAVE_ALL_INT
GET_CURRENT(%d0)
tstb %curptr@(TASK_NEEDRESCHED)
jne ret_from_exception | deliver signals,
| reschedule etc..
RESTORE_ALL
| deliver signals, reschedule etc..
jra ret_from_exception
|
| _060_real_chk():

5
arch/m68k/kernel/asm-offsets.c
View File

@ -25,11 +25,6 @@ int main(void)
DEFINE(TASK_STATE, offsetof(struct task_struct, state));
DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
DEFINE(TASK_WORK, offsetof(struct task_struct, thread.work));
DEFINE(TASK_NEEDRESCHED, offsetof(struct task_struct, thread.work.need_resched));
DEFINE(TASK_SYSCALL_TRACE, offsetof(struct task_struct, thread.work.syscall_trace));
DEFINE(TASK_SIGPENDING, offsetof(struct task_struct, thread.work.sigpending));
DEFINE(TASK_NOTIFY_RESUME, offsetof(struct task_struct, thread.work.notify_resume));
DEFINE(TASK_THREAD, offsetof(struct task_struct, thread));
DEFINE(TASK_INFO, offsetof(struct task_struct, thread.info));
DEFINE(TASK_MM, offsetof(struct task_struct, mm));

78
arch/m68k/kernel/entry.S
View File

@ -44,9 +44,7 @@
#include <asm/asm-offsets.h>
.globl system_call, buserr, trap
.globl resume, ret_from_exception
.globl ret_from_signal
.globl system_call, buserr, trap, resume
.globl inthandler, sys_call_table
.globl sys_fork, sys_clone, sys_vfork
.globl ret_from_interrupt, bad_interrupt
@ -58,7 +56,7 @@ ENTRY(buserr)
movel %sp,%sp@- | stack frame pointer argument
bsrl buserr_c
addql #4,%sp
jra ret_from_exception
jra .Lret_from_exception
ENTRY(trap)
SAVE_ALL_INT
@ -66,7 +64,7 @@ ENTRY(trap)
movel %sp,%sp@- | stack frame pointer argument
bsrl trap_c
addql #4,%sp
jra ret_from_exception
jra .Lret_from_exception
| After a fork we jump here directly from resume,
| so that %d1 contains the previous task
@ -75,30 +73,31 @@ ENTRY(ret_from_fork)
movel %d1,%sp@-
jsr schedule_tail
addql #4,%sp
jra ret_from_exception
jra .Lret_from_exception
badsys:
movel #-ENOSYS,%sp@(PT_D0)
jra ret_from_exception
do_trace:
do_trace_entry:
movel #-ENOSYS,%sp@(PT_D0) | needed for strace
subql #4,%sp
SAVE_SWITCH_STACK
jbsr syscall_trace
RESTORE_SWITCH_STACK
addql #4,%sp
movel %sp@(PT_ORIG_D0),%d1
movel #-ENOSYS,%d0
cmpl #NR_syscalls,%d1
jcc 1f
jbsr @(sys_call_table,%d1:l:4)@(0)
1: movel %d0,%sp@(PT_D0) | save the return value
subql #4,%sp | dummy return address
movel %sp@(PT_ORIG_D0),%d0
cmpl #NR_syscalls,%d0
jcs syscall
badsys:
movel #-ENOSYS,%sp@(PT_D0)
jra ret_from_syscall
do_trace_exit:
subql #4,%sp
SAVE_SWITCH_STACK
jbsr syscall_trace
RESTORE_SWITCH_STACK
addql #4,%sp
jra .Lret_from_exception
ret_from_signal:
ENTRY(ret_from_signal)
RESTORE_SWITCH_STACK
addql #4,%sp
/* on 68040 complete pending writebacks if any */
@ -111,7 +110,7 @@ ret_from_signal:
addql #4,%sp
1:
#endif
jra ret_from_exception
jra .Lret_from_exception
ENTRY(system_call)
SAVE_ALL_SYS
@ -120,30 +119,34 @@ ENTRY(system_call)
| save top of frame
movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
tstb %curptr@(TASK_SYSCALL_TRACE)
jne do_trace
| syscall trace?
tstb %curptr@(TASK_INFO+TINFO_FLAGS+2)
jmi do_trace_entry
cmpl #NR_syscalls,%d0
jcc badsys
syscall:
jbsr @(sys_call_table,%d0:l:4)@(0)
movel %d0,%sp@(PT_D0) | save the return value
ret_from_syscall:
|oriw #0x0700,%sr
movel %curptr@(TASK_WORK),%d0
movew %curptr@(TASK_INFO+TINFO_FLAGS+2),%d0
jne syscall_exit_work
1: RESTORE_ALL
syscall_exit_work:
btst #5,%sp@(PT_SR) | check if returning to kernel
bnes 1b | if so, skip resched, signals
tstw %d0
jeq do_signal_return
tstb %d0
jne do_delayed_trace
lslw #1,%d0
jcs do_trace_exit
jmi do_delayed_trace
lslw #8,%d0
jmi do_signal_return
pea resume_userspace
jmp schedule
jra schedule
ret_from_exception:
ENTRY(ret_from_exception)
.Lret_from_exception:
btst #5,%sp@(PT_SR) | check if returning to kernel
bnes 1f | if so, skip resched, signals
| only allow interrupts when we are really the last one on the
@ -152,19 +155,18 @@ ret_from_exception:
andw #ALLOWINT,%sr
resume_userspace:
movel %curptr@(TASK_WORK),%d0
lsrl #8,%d0
moveb %curptr@(TASK_INFO+TINFO_FLAGS+3),%d0
jne exit_work
1: RESTORE_ALL
exit_work:
| save top of frame
movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
tstb %d0
jeq do_signal_return
lslb #1,%d0
jmi do_signal_return
pea resume_userspace
jmp schedule
jra schedule
do_signal_return:
|andw #ALLOWINT,%sr
@ -254,7 +256,7 @@ ret_from_interrupt:
/* check if we need to do software interrupts */
tstl irq_stat+CPUSTAT_SOFTIRQ_PENDING
jeq ret_from_exception
jeq .Lret_from_exception
pea ret_from_exception
jra do_softirq

15
arch/m68k/kernel/ptrace.c
View File

@ -109,7 +109,7 @@ static inline void singlestep_disable(struct task_struct *child)
{
unsigned long tmp = get_reg(child, PT_SR) & ~(TRACE_BITS << 16);
put_reg(child, PT_SR, tmp);
child->thread.work.delayed_trace = 0;
clear_tsk_thread_flag(child, TIF_DELAYED_TRACE);
}
/*
@ -118,7 +118,7 @@ static inline void singlestep_disable(struct task_struct *child)
void ptrace_disable(struct task_struct *child)
{
singlestep_disable(child);
child->thread.work.syscall_trace = 0;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
}
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
@ -198,9 +198,9 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
goto out_eio;
if (request == PTRACE_SYSCALL)
child->thread.work.syscall_trace = ~0;
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
else
child->thread.work.syscall_trace = 0;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
singlestep_disable(child);
wake_up_process(child);
@ -223,10 +223,10 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
if (!valid_signal(data))
goto out_eio;
child->thread.work.syscall_trace = 0;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
tmp = get_reg(child, PT_SR) | (TRACE_BITS << 16);
put_reg(child, PT_SR, tmp);
child->thread.work.delayed_trace = 1;
set_tsk_thread_flag(child, TIF_DELAYED_TRACE);
child->exit_code = data;
/* give it a chance to run. */
@ -288,9 +288,6 @@ out_eio:
asmlinkage void syscall_trace(void)
{
if (!current->thread.work.delayed_trace &&
!current->thread.work.syscall_trace)
return;
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
? 0x80 : 0));
/*

12
include/asm-m68k/processor.h
View File

@ -56,17 +56,6 @@ static inline void wrusp(unsigned long usp)
#endif
#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr)
struct task_work {
unsigned char sigpending;
unsigned char notify_resume; /* request for notification on
userspace execution resumption */
char need_resched;
unsigned char delayed_trace; /* single step a syscall */
unsigned char syscall_trace; /* count of syscall interceptors */
unsigned char memdie; /* task was selected to be killed */
unsigned char pad[2];
};
struct thread_struct {
unsigned long ksp; /* kernel stack pointer */
unsigned long usp; /* user stack pointer */
@ -79,7 +68,6 @@ struct thread_struct {
unsigned long fp[8*3];
unsigned long fpcntl[3]; /* fp control regs */
unsigned char fpstate[FPSTATESIZE]; /* floating point state */
struct task_work work;
struct thread_info info;
};

81
include/asm-m68k/thread_info.h
View File

@ -6,12 +6,11 @@
struct thread_info {
struct task_struct *task; /* main task structure */
unsigned long flags;
struct exec_domain *exec_domain; /* execution domain */
int preempt_count; /* 0 => preemptable, <0 => BUG */
__u32 cpu; /* should always be 0 on m68k */
struct restart_block restart_block;
__u8 supervisor_stack[0];
};
#define PREEMPT_ACTIVE 0x4000000
@ -49,76 +48,14 @@ struct thread_info {
#define end_of_stack(p) ((unsigned long *)(p)->thread_info + 1)
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
#define TIF_DELAYED_TRACE 1 /* single step a syscall */
#define TIF_NOTIFY_RESUME 2 /* resumption notification requested */
#define TIF_SIGPENDING 3 /* signal pending */
#define TIF_NEED_RESCHED 4 /* rescheduling necessary */
#define TIF_MEMDIE 5
extern int thread_flag_fixme(void);
/*
* flag set/clear/test wrappers
* - pass TIF_xxxx constants to these functions
/* entry.S relies on these definitions!
* bits 0-7 are tested at every exception exit
* bits 8-15 are also tested at syscall exit
*/
#define __set_tsk_thread_flag(tsk, flag, val) ({ \
switch (flag) { \
case TIF_SIGPENDING: \
tsk->thread.work.sigpending = val; \
break; \
case TIF_NEED_RESCHED: \
tsk->thread.work.need_resched = val; \
break; \
case TIF_SYSCALL_TRACE: \
tsk->thread.work.syscall_trace = val; \
break; \
case TIF_MEMDIE: \
tsk->thread.work.memdie = val; \
break; \
default: \
thread_flag_fixme(); \
} \
})
#define __get_tsk_thread_flag(tsk, flag) ({ \
int ___res; \
switch (flag) { \
case TIF_SIGPENDING: \
___res = tsk->thread.work.sigpending; \
break; \
case TIF_NEED_RESCHED: \
___res = tsk->thread.work.need_resched; \
break; \
case TIF_SYSCALL_TRACE: \
___res = tsk->thread.work.syscall_trace;\
break; \
case TIF_MEMDIE: \
___res = tsk->thread.work.memdie;\
break; \
default: \
___res = thread_flag_fixme(); \
} \
___res; \
})
#define __get_set_tsk_thread_flag(tsk, flag, val) ({ \
int __res = __get_tsk_thread_flag(tsk, flag); \
__set_tsk_thread_flag(tsk, flag, val); \
__res; \
})
#define set_tsk_thread_flag(tsk, flag) __set_tsk_thread_flag(tsk, flag, ~0)
#define clear_tsk_thread_flag(tsk, flag) __set_tsk_thread_flag(tsk, flag, 0)
#define test_and_set_tsk_thread_flag(tsk, flag) __get_set_tsk_thread_flag(tsk, flag, ~0)
#define test_tsk_thread_flag(tsk, flag) __get_tsk_thread_flag(tsk, flag)
#define set_thread_flag(flag) set_tsk_thread_flag(current, flag)
#define clear_thread_flag(flag) clear_tsk_thread_flag(current, flag)
#define test_thread_flag(flag) test_tsk_thread_flag(current, flag)
#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
#define TIF_SIGPENDING 6 /* signal pending */
#define TIF_NEED_RESCHED 7 /* rescheduling necessary */
#define TIF_DELAYED_TRACE 14 /* single step a syscall */
#define TIF_SYSCALL_TRACE 15 /* syscall trace active */
#define TIF_MEMDIE 16
#endif /* _ASM_M68K_THREAD_INFO_H */

45
include/linux/thread_info.h
View File

@ -27,31 +27,6 @@ extern long do_no_restart_syscall(struct restart_block *parm);
* - pass TIF_xxxx constants to these functions
*/
static inline void set_thread_flag(int flag)
{
set_bit(flag,&current_thread_info()->flags);
}
static inline void clear_thread_flag(int flag)
{
clear_bit(flag,&current_thread_info()->flags);
}
static inline int test_and_set_thread_flag(int flag)
{
return test_and_set_bit(flag,&current_thread_info()->flags);
}
static inline int test_and_clear_thread_flag(int flag)
{
return test_and_clear_bit(flag,&current_thread_info()->flags);
}
static inline int test_thread_flag(int flag)
{
return test_bit(flag,&current_thread_info()->flags);
}
static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
{
set_bit(flag,&ti->flags);
@ -77,15 +52,19 @@ static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
return test_bit(flag,&ti->flags);
}
static inline void set_need_resched(void)
{
set_thread_flag(TIF_NEED_RESCHED);
}
#define set_thread_flag(flag) \
set_ti_thread_flag(current_thread_info(), flag)
#define clear_thread_flag(flag) \
clear_ti_thread_flag(current_thread_info(), flag)
#define test_and_set_thread_flag(flag) \
test_and_set_ti_thread_flag(current_thread_info(), flag)
#define test_and_clear_thread_flag(flag) \
test_and_clear_ti_thread_flag(current_thread_info(), flag)
#define test_thread_flag(flag) \
test_ti_thread_flag(current_thread_info(), flag)
static inline void clear_need_resched(void)
{
clear_thread_flag(TIF_NEED_RESCHED);
}
#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
#endif