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entry_mm.h

#ifndef __M68K_ENTRY_H
#define __M68K_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
 *    2E(sp) - pc
 *    32(sp) - format & vector
 */

/*
 * 97/05/14 Andreas: Register %a2 is now set to the current task throughout
 *               the whole kernel.
 */

/* the following macro is used when enabling interrupts */
#if defined(MACH_ATARI_ONLY)
      /* block out HSYNC on the atari */
#define ALLOWINT  (~0x400)
#define     MAX_NOINT_IPL     3
#else
      /* portable version */
#define ALLOWINT  (~0x700)
#define     MAX_NOINT_IPL     0
#endif /* machine compilation types */

#ifdef __ASSEMBLY__

#define curptr a2

LFLUSH_I_AND_D = 0x00000808

/* process bits for task_struct.ptrace */
PT_TRACESYS_OFF = 3
PT_TRACESYS_BIT = 1
PT_PTRACED_OFF = 3
PT_PTRACED_BIT = 0
PT_DTRACE_OFF = 3
PT_DTRACE_BIT = 2

#define SAVE_ALL_INT save_all_int
#define SAVE_ALL_SYS save_all_sys
#define RESTORE_ALL restore_all
/*
 * This defines the normal kernel pt-regs layout.
 *
 * regs a3-a6 and d6-d7 are preserved by C code
 * the kernel doesn't mess with usp unless it needs to
 */

/*
 * a -1 in the orig_d0 field signifies
 * that the stack frame is NOT for syscall
 */
.macro      save_all_int
      clrl  %sp@-       | stk_adj
      pea   -1:w        | orig d0
      movel %d0,%sp@-   | d0
      moveml      %d1-%d5/%a0-%a1/%curptr,%sp@-
.endm

.macro      save_all_sys
      clrl  %sp@-       | stk_adj
      movel %d0,%sp@-   | orig d0
      movel %d0,%sp@-   | d0
      moveml      %d1-%d5/%a0-%a1/%curptr,%sp@-
.endm

.macro      restore_all
      moveml      %sp@+,%a0-%a1/%curptr/%d1-%d5
      movel %sp@+,%d0
      addql #4,%sp            | orig d0
      addl  %sp@+,%sp   | stk adj
      rte
.endm

#define SWITCH_STACK_SIZE (6*4+4)   /* includes return address */

#define SAVE_SWITCH_STACK save_switch_stack
#define RESTORE_SWITCH_STACK restore_switch_stack
#define GET_CURRENT(tmp) get_current tmp

.macro      save_switch_stack
      moveml      %a3-%a6/%d6-%d7,%sp@-
.endm

.macro      restore_switch_stack
      moveml      %sp@+,%a3-%a6/%d6-%d7
.endm

.macro      get_current reg=%d0
      movel %sp,\reg
      andw  #-THREAD_SIZE,\reg
      movel \reg,%curptr
      movel %curptr@,%curptr
.endm

#else /* C source */

#define STR(X) STR1(X)
#define STR1(X) #X

#define SAVE_ALL_INT                      \
      "clrl %%sp@-;"    /* stk_adj */     \
      "pea  -1:w;"          /* orig d0 = -1 */  \
      "movel      %%d0,%%sp@-;" /* d0 */        \
      "moveml     %%d1-%%d5/%%a0-%%a2,%%sp@-"
#define GET_CURRENT(tmp) \
      "movel      %%sp,"#tmp"\n\t" \
      "andw #-"STR(THREAD_SIZE)","#tmp"\n\t" \
      "movel      "#tmp",%%a2\n\t" \
      "movel      %%a2@,%%a2"

#endif

#endif /* __M68K_ENTRY_H */

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