m68k,m68knommu: merge header files

[pandora-kernel.git] / arch / m68k / include / asm / entry_no.h

diff --git a/arch/m68k/include/asm/entry_no.h b/arch/m68k/include/asm/entry_no.h
new file mode 100644 (file)
index 0000000..c2553d2
--- /dev/null
+++ b/arch/m68k/include/asm/entry_no.h
@@ -0,0 +1,182 @@
+#ifndef __M68KNOMMU_ENTRY_H
+#define __M68KNOMMU_ENTRY_H
+
+#include <asm/setup.h>
+#include <asm/page.h>
+
+/*
+ * Stack layout in 'ret_from_exception':
+ *
+ * This allows access to the syscall arguments in registers d1-d5
+ *
+ *      0(sp) - d1
+ *      4(sp) - d2
+ *      8(sp) - d3
+ *      C(sp) - d4
+ *     10(sp) - d5
+ *     14(sp) - a0
+ *     18(sp) - a1
+ *     1C(sp) - a2
+ *     20(sp) - d0
+ *     24(sp) - orig_d0
+ *     28(sp) - stack adjustment
+ *     2C(sp) - [ sr              ] [ format & vector ]
+ *     2E(sp) - [ pc-hiword       ] [ sr              ]
+ *     30(sp) - [ pc-loword       ] [ pc-hiword       ]
+ *     32(sp) - [ format & vector ] [ pc-loword       ]
+ *               ^^^^^^^^^^^^^^^^^   ^^^^^^^^^^^^^^^^^
+ *                     M68K              COLDFIRE
+ */
+
+#define ALLOWINT 0xf8ff
+
+#ifdef __ASSEMBLY__
+
+/* process bits for task_struct.flags */
+PF_TRACESYS_OFF = 3
+PF_TRACESYS_BIT = 5
+PF_PTRACED_OFF = 3
+PF_PTRACED_BIT = 4
+PF_DTRACE_OFF = 1
+PF_DTRACE_BIT = 5
+
+LENOSYS = 38
+
+#define SWITCH_STACK_SIZE (6*4+4)      /* Includes return address */
+
+/*
+ * This defines the normal kernel pt-regs layout.
+ *
+ * regs are a2-a6 and d6-d7 preserved by C code
+ * the kernel doesn't mess with usp unless it needs to
+ */
+
+#ifdef CONFIG_COLDFIRE
+/*
+ * This is made a little more tricky on the ColdFire. There is no
+ * separate kernel and user stack pointers. Need to artificially
+ * construct a usp in software... When doing this we need to disable
+ * interrupts, otherwise bad things could happen.
+ */
+.macro SAVE_ALL
+       move    #0x2700,%sr             /* disable intrs */
+       btst    #5,%sp@(2)              /* from user? */
+       bnes    6f                      /* no, skip */
+       movel   %sp,sw_usp              /* save user sp */
+       addql   #8,sw_usp               /* remove exception */
+       movel   sw_ksp,%sp              /* kernel sp */
+       subql   #8,%sp                  /* room for exception */
+       clrl    %sp@-                   /* stkadj */
+       movel   %d0,%sp@-               /* orig d0 */
+       movel   %d0,%sp@-               /* d0 */
+       lea     %sp@(-32),%sp           /* space for 8 regs */
+       moveml  %d1-%d5/%a0-%a2,%sp@
+       movel   sw_usp,%a0              /* get usp */
+       movel   %a0@-,%sp@(PT_PC)       /* copy exception program counter */
+       movel   %a0@-,%sp@(PT_FORMATVEC)/* copy exception format/vector/sr */
+       bra     7f
+       6:
+       clrl    %sp@-                   /* stkadj */
+       movel   %d0,%sp@-               /* orig d0 */
+       movel   %d0,%sp@-               /* d0 */
+       lea     %sp@(-32),%sp           /* space for 8 regs */
+       moveml  %d1-%d5/%a0-%a2,%sp@
+       7:
+.endm
+
+.macro RESTORE_ALL
+       btst    #5,%sp@(PT_SR)          /* going user? */
+       bnes    8f                      /* no, skip */
+       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
+       lea     %sp@(32),%sp            /* space for 8 regs */
+       movel   %sp@+,%d0
+       addql   #4,%sp                  /* orig d0 */
+       addl    %sp@+,%sp               /* stkadj */
+       addql   #8,%sp                  /* remove exception */
+       movel   %sp,sw_ksp              /* save ksp */
+       subql   #8,sw_usp               /* set exception */
+       movel   sw_usp,%sp              /* restore usp */
+       rte
+       8:
+       moveml  %sp@,%d1-%d5/%a0-%a2
+       lea     %sp@(32),%sp            /* space for 8 regs */
+       movel   %sp@+,%d0
+       addql   #4,%sp                  /* orig d0 */
+       addl    %sp@+,%sp               /* stkadj */
+       rte
+.endm
+
+/*
+ * Quick exception save, use current stack only.
+ */
+.macro SAVE_LOCAL
+       move    #0x2700,%sr             /* disable intrs */
+       clrl    %sp@-                   /* stkadj */
+       movel   %d0,%sp@-               /* orig d0 */
+       movel   %d0,%sp@-               /* d0 */
+       lea     %sp@(-32),%sp           /* space for 8 regs */
+       moveml  %d1-%d5/%a0-%a2,%sp@
+.endm
+
+.macro RESTORE_LOCAL
+       moveml  %sp@,%d1-%d5/%a0-%a2
+       lea     %sp@(32),%sp            /* space for 8 regs */
+       movel   %sp@+,%d0
+       addql   #4,%sp                  /* orig d0 */
+       addl    %sp@+,%sp               /* stkadj */
+       rte
+.endm
+
+.macro SAVE_SWITCH_STACK
+       lea     %sp@(-24),%sp           /* 6 regs */
+       moveml  %a3-%a6/%d6-%d7,%sp@
+.endm
+
+.macro RESTORE_SWITCH_STACK
+       moveml  %sp@,%a3-%a6/%d6-%d7
+       lea     %sp@(24),%sp            /* 6 regs */
+.endm
+
+/*
+ * Software copy of the user and kernel stack pointers... Ugh...
+ * Need these to get around ColdFire not having separate kernel
+ * and user stack pointers.
+ */
+.globl sw_usp
+.globl sw_ksp
+
+#else /* !CONFIG_COLDFIRE */
+
+/*
+ * Standard 68k interrupt entry and exit macros.
+ */
+.macro SAVE_ALL
+       clrl    %sp@-                   /* stkadj */
+       movel   %d0,%sp@-               /* orig d0 */
+       movel   %d0,%sp@-               /* d0 */
+       moveml  %d1-%d5/%a0-%a2,%sp@-
+.endm
+
+.macro RESTORE_ALL
+       moveml  %sp@+,%a0-%a2/%d1-%d5
+       movel   %sp@+,%d0
+       addql   #4,%sp                  /* orig d0 */
+       addl    %sp@+,%sp               /* stkadj */
+       rte
+.endm
+
+.macro SAVE_SWITCH_STACK
+       moveml  %a3-%a6/%d6-%d7,%sp@-
+.endm
+
+.macro RESTORE_SWITCH_STACK
+       moveml  %sp@+,%a3-%a6/%d6-%d7
+.endm
+
+#endif /* !CONFIG_COLDFIRE */
+#endif /* __ASSEMBLY__ */
+#endif /* __M68KNOMMU_ENTRY_H */