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[PATCH] m68knommu: improve syscall entry and fix strace 

Here is a patch to the system call handling for 5307/5272/etc to:

- fix the strace support (one tested the wrong bit)
- make all system calls a little bit faster by inlining set_esp0 and
  supporting ENOSYS out of the critical path.
- remove extraneous spaces

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Philippe De Muyter 2006-06-26 11:37:57 +10:00 committed by Linus Torvalds
parent 7bf9a37d8d
commit 623f523cc0
1 changed files with 20 additions and 26 deletions
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46
arch/m68knommu/platform/5307/entry.S
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@ -4,8 +4,8 @@
* Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com)
* Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
* Kenneth Albanowski <kjahds@kjahds.com>,
* Copyright (C) 2000 Lineo Inc. (www.lineo.com)
* Copyright (C) 2004 Macq Electronique SA. (www.macqel.com)
* Copyright (C) 2000 Lineo Inc. (www.lineo.com)
* Copyright (C) 2004-2006 Macq Electronique SA. (www.macqel.com)
*
* Based on:
*
@ -56,32 +56,27 @@ sw_usp:
.globl inthandler
.globl fasthandler
enosys:
mov.l #sys_ni_syscall,%d3
bra 1f
ENTRY(system_call)
SAVE_ALL
move #0x2000,%sr /* enable intrs again */
movel #-LENOSYS,%d2
movel %d2,PT_D0(%sp) /* default return value in d0 */
/* original D0 is in orig_d0 */
movel %d0,%d2
/* save top of frame */
pea %sp@
jbsr set_esp0
addql #4,%sp
cmpl #NR_syscalls,%d2
jcc ret_from_exception
cmpl #NR_syscalls,%d0
jcc enosys
lea sys_call_table,%a0
lsll #2,%d2 /* movel %a0@(%d2:l:4),%d3 */
movel %a0@(%d2),%d3
jeq ret_from_exception
lsrl #2,%d2
lsll #2,%d0 /* movel %a0@(%d0:l:4),%d3 */
movel %a0@(%d0),%d3
jeq enosys
1:
movel %sp,%d2 /* get thread_info pointer */
andl #-THREAD_SIZE,%d2 /* at start of kernel stack */
movel %d2,%a0
btst #TIF_SYSCALL_TRACE,%a0@(TI_FLAGS)
movel %sp,%a0@(THREAD_ESP0) /* save top of frame */
btst #(TIF_SYSCALL_TRACE%8),%a0@(TI_FLAGS+(31-TIF_SYSCALL_TRACE)/8)
bnes 1f
movel %d3,%a0
@ -126,8 +121,8 @@ Luser_return:
jne Lwork_to_do /* still work to do */
Lreturn:
move #0x2700,%sr /* disable intrs */
movel sw_usp,%a0 /* get usp */
move #0x2700,%sr /* disable intrs */
movel sw_usp,%a0 /* get usp */
movel %sp@(PT_PC),%a0@- /* copy exception program counter */
movel %sp@(PT_FORMATVEC),%a0@-/* copy exception format/vector/sr */
moveml %sp@,%d1-%d5/%a0-%a2
@ -170,7 +165,7 @@ ENTRY(inthandler)
movel %d0,%sp@(PT_ORIG_D0)
addql #1,local_irq_count
movew %sp@(PT_FORMATVEC),%d0 /* put exception # in d0 */
movew %sp@(PT_FORMATVEC),%d0 /* put exception # in d0 */
andl #0x03fc,%d0 /* mask out vector only */
leal per_cpu__kstat+STAT_IRQ,%a0
@ -184,7 +179,7 @@ ENTRY(inthandler)
movel %sp,%sp@- /* push regs arg onto stack */
movel %a0@(8),%sp@- /* push devid arg */
movel %d0,%sp@- /* push vector # on stack */
movel %d0,%sp@- /* push vector # on stack */
movel %a0@,%a0 /* get function to call */
jbsr %a0@ /* call vector handler */
@ -201,7 +196,7 @@ ENTRY(inthandler)
ENTRY(fasthandler)
SAVE_LOCAL
movew %sp@(PT_FORMATVEC),%d0
movew %sp@(PT_FORMATVEC),%d0
andl #0x03fc,%d0 /* mask out vector only */
leal per_cpu__kstat+STAT_IRQ,%a0
@ -210,7 +205,7 @@ ENTRY(fasthandler)
movel %sp,%sp@- /* push regs arg onto stack */
clrl %sp@- /* push devid arg */
lsrl #2,%d0 /* calculate real vector # */
movel %d0,%sp@- /* push vector # on stack */
movel %d0,%sp@- /* push vector # on stack */
lsll #4,%d0 /* adjust for array offset */
lea irq_list,%a0
@ -265,4 +260,3 @@ ENTRY(resume)
movew %a1@(TASK_THREAD+THREAD_SR),%d0 /* restore thread status reg */
movew %d0, %sr
rts