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-rw-r--r--arch/m68k/kernel/entry.S58
1 files changed, 28 insertions, 30 deletions
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index 9dd76fbb7c6b..9434fca68de5 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -36,7 +36,6 @@
#include <linux/linkage.h>
#include <asm/errno.h>
#include <asm/setup.h>
-#include <asm/segment.h>
#include <asm/traps.h>
#include <asm/unistd.h>
#include <asm/asm-offsets.h>
@@ -78,20 +77,38 @@ ENTRY(__sys_clone3)
ENTRY(sys_sigreturn)
SAVE_SWITCH_STACK
- movel %sp,%sp@- | switch_stack pointer
- pea %sp@(SWITCH_STACK_SIZE+4) | pt_regs pointer
+ movel %sp,%a1 | switch_stack pointer
+ lea %sp@(SWITCH_STACK_SIZE),%a0 | pt_regs pointer
+ lea %sp@(-84),%sp | leave a gap
+ movel %a1,%sp@-
+ movel %a0,%sp@-
jbsr do_sigreturn
- addql #8,%sp
- RESTORE_SWITCH_STACK
- rts
+ jra 1f | shared with rt_sigreturn()
ENTRY(sys_rt_sigreturn)
SAVE_SWITCH_STACK
- movel %sp,%sp@- | switch_stack pointer
- pea %sp@(SWITCH_STACK_SIZE+4) | pt_regs pointer
+ movel %sp,%a1 | switch_stack pointer
+ lea %sp@(SWITCH_STACK_SIZE),%a0 | pt_regs pointer
+ lea %sp@(-84),%sp | leave a gap
+ movel %a1,%sp@-
+ movel %a0,%sp@-
+ | stack contents:
+ | [original pt_regs address] [original switch_stack address]
+ | [gap] [switch_stack] [pt_regs] [exception frame]
jbsr do_rt_sigreturn
- addql #8,%sp
+
+1:
+ | stack contents now:
+ | [original pt_regs address] [original switch_stack address]
+ | [unused part of the gap] [moved switch_stack] [moved pt_regs]
+ | [replacement exception frame]
+ | return value of do_{rt_,}sigreturn() points to moved switch_stack.
+
+ movel %d0,%sp | discard the leftover junk
RESTORE_SWITCH_STACK
+ | stack contents now is just [syscall return address] [pt_regs] [frame]
+ | return pt_regs.d0
+ movel %sp@(PT_OFF_D0+4),%d0
rts
ENTRY(buserr)
@@ -182,25 +199,6 @@ do_trace_exit:
addql #4,%sp
jra .Lret_from_exception
-ENTRY(ret_from_signal)
- movel %curptr@(TASK_STACK),%a1
- tstb %a1@(TINFO_FLAGS+2)
- jge 1f
- jbsr syscall_trace
-1: RESTORE_SWITCH_STACK
- addql #4,%sp
-/* on 68040 complete pending writebacks if any */
-#ifdef CONFIG_M68040
- bfextu %sp@(PT_OFF_FORMATVEC){#0,#4},%d0
- subql #7,%d0 | bus error frame ?
- jbne 1f
- movel %sp,%sp@-
- jbsr berr_040cleanup
- addql #4,%sp
-1:
-#endif
- jra .Lret_from_exception
-
ENTRY(system_call)
SAVE_ALL_SYS
@@ -338,7 +336,7 @@ resume:
/* save fs (sfc,%dfc) (may be pointing to kernel memory) */
movec %sfc,%d0
- movew %d0,%a0@(TASK_THREAD+THREAD_FS)
+ movew %d0,%a0@(TASK_THREAD+THREAD_FC)
/* save usp */
/* it is better to use a movel here instead of a movew 8*) */
@@ -424,7 +422,7 @@ resume:
movel %a0,%usp
/* restore fs (sfc,%dfc) */
- movew %a1@(TASK_THREAD+THREAD_FS),%a0
+ movew %a1@(TASK_THREAD+THREAD_FC),%a0
movec %a0,%sfc
movec %a0,%dfc