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m68k: set register a2 to current if MMU enabled on ColdFire 

Virtual memory m68k systems build with register a2 dedicated to being the
current proc pointer (non-MMU don't do this). Add code to the ColdFire
interrupt and exception processing to set this on entry, and at context
switch time. We use the same GET_CURRENT() macro that MMU enabled code
uses - modifying it so that the assembler is ColdFire clean.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Matt Waddel <mwaddel@yahoo.com>
Acked-by: Kurt Mahan <kmahan@xmission.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Greg Ungerer 2011-10-14 15:41:56 +10:00
parent 88be351593
commit bbc6f1ba50
3 changed files with 17 additions and 2 deletions
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10
arch/m68k/include/asm/entry.h
View File

@ -222,16 +222,24 @@
* Non-MMU systems do not reserve %a2 in this way, and this definition is
* not used for them.
*/
#ifdef CONFIG_MMU
#define curptr a2
#define GET_CURRENT(tmp) get_current tmp
.macro get_current reg=%d0
movel %sp,\reg
andw #-THREAD_SIZE,\reg
andl #-THREAD_SIZE,\reg
movel \reg,%curptr
movel %curptr@,%curptr
.endm
#else
#define GET_CURRENT(tmp)
#endif /* CONFIG_MMU */
#else /* C source */
#define STR(X) STR1(X)

3
arch/m68k/kernel/entry_no.S
View File

@ -44,6 +44,7 @@
ENTRY(buserr)
SAVE_ALL_INT
GET_CURRENT(%d0)
movel %sp,%sp@- /* stack frame pointer argument */
jsr buserr_c
addql #4,%sp
@ -51,6 +52,7 @@ ENTRY(buserr)
ENTRY(trap)
SAVE_ALL_INT
GET_CURRENT(%d0)
movel %sp,%sp@- /* stack frame pointer argument */
jsr trap_c
addql #4,%sp
@ -61,6 +63,7 @@ ENTRY(trap)
.globl dbginterrupt
ENTRY(dbginterrupt)
SAVE_ALL_INT
GET_CURRENT(%d0)
movel %sp,%sp@- /* stack frame pointer argument */
jsr dbginterrupt_c
addql #4,%sp

6
arch/m68k/platform/coldfire/entry.S
View File

@ -62,6 +62,7 @@ enosys:
ENTRY(system_call)
SAVE_ALL_SYS
move #0x2000,%sr /* enable intrs again */
GET_CURRENT(%d2)
cmpl #NR_syscalls,%d0
jcc enosys
@ -165,6 +166,7 @@ Lsignal_return:
*/
ENTRY(inthandler)
SAVE_ALL_INT
GET_CURRENT(%d2)
movew %sp@(PT_OFF_FORMATVEC),%d0 /* put exception # in d0 */
andl #0x03fc,%d0 /* mask out vector only */
@ -190,7 +192,9 @@ ENTRY(resume)
movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack pointer */
RDUSP /* movel %usp,%a3 */
movel %a3,%a0@(TASK_THREAD+THREAD_USP) /* save thread user stack */
#ifdef CONFIG_MMU
movel %a1,%a2 /* set new current */
#endif
movel %a1@(TASK_THREAD+THREAD_USP),%a3 /* restore thread user stack */
WRUSP /* movel %a3,%usp */
movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new kernel stack */