Commit 3b66a1ed authored by Roman Zippel's avatar Roman Zippel Committed by Linus Torvalds
Browse files

[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: default avatarRoman Zippel <zippel@linux-m68k.org>
Cc: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent abd03753

arch/m68k/fpsp040/skeleton.S

+2 −4
Original line number Diff line number Diff line
@@ -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

arch/m68k/ifpsp060/iskeleton.S

+2 −4
Original line number Diff line number Diff line
@@ -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():

arch/m68k/kernel/asm-offsets.c

+0 −5
Original line number Diff line number Diff line
@@ -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));

arch/m68k/kernel/entry.S

+40 −38
Original line number Diff line number Diff line
@@ -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

arch/m68k/kernel/ptrace.c

+6 −9
Original line number Diff line number Diff line
@@ -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));

	/*

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