include/asm-m68k/entry.h

   1 #ifndef __M68K_ENTRY_H
   2 #define __M68K_ENTRY_H
   3
   4 #include <linux/config.h>
   5 #include <asm/setup.h>
   6 #ifdef CONFIG_KGDB
   7 #include <asm/kgdb.h>
   8 #endif
   9
  10 /*
  11  * Stack layout in 'ret_from_exception':
  12  *
  13  *      This allows access to the syscall arguments in registers d1-d5
  14  *
  15  *       0(sp) - d1
  16  *       4(sp) - d2
  17  *       8(sp) - d3
  18  *       C(sp) - d4
  19  *      10(sp) - d5
  20  *      14(sp) - a0
  21  *      18(sp) - a1
  22  *      1C(sp) - a2
  23  *      20(sp) - d0
  24  *      24(sp) - orig_d0
  25  *      28(sp) - stack adjustment
  26  *      2C(sp) - sr
  27  *      2E(sp) - pc
  28  *      32(sp) - format & vector
  29  */
  30
  31 /*
  32  * 97/05/14 Andreas: Register %a2 is now set to the current task throughout
  33  *                   the whole kernel.
  34  */
  35
  36 #ifdef __ASSEMBLY__
  37
  38 #define curptr a2
  39
  40 /* the following macro is used when enabling interrupts */
  41 #if defined(MACH_ATARI_ONLY) && !defined(CONFIG_HADES)
  42         /* block out HSYNC on the atari */
  43 #define ALLOWINT 0xfbff
  44 #define MAX_NOINT_IPL   3
  45 #else
  46         /* portable version */
  47 #define ALLOWINT 0xf8ff
  48 #define MAX_NOINT_IPL   0
  49 #endif /* machine compilation types */
  50
  51 LFLUSH_I_AND_D = 0x00000808
  52 LSIGTRAP = 5
  53
  54 /* process bits for task_struct.flags */
  55 PF_TRACESYS_OFF = 3
  56 PF_TRACESYS_BIT = 5
  57 PF_PTRACED_OFF = 3
  58 PF_PTRACED_BIT = 4
  59 PF_DTRACE_OFF = 1
  60 PF_DTRACE_BIT = 5
  61
  62 #define SAVE_ALL_INT save_all_int
  63 #define SAVE_ALL_SYS save_all_sys
  64 #define RESTORE_ALL restore_all
  65 /*
  66  * This defines the normal kernel pt-regs layout.
  67  *
  68  * regs a3-a6 and d6-d7 are preserved by C code
  69  * the kernel doesn't mess with usp unless it needs to
  70  */
  71 #ifndef CONFIG_KGDB
  72 /*
  73  * a -1 in the orig_d0 field signifies
  74  * that the stack frame is NOT for syscall
  75  */
  76 .macro  save_all_int
  77         clrl    %sp@-           | stk_adj
  78         pea     -1:w            | orig d0
  79         movel   %d0,%sp@-       | d0
  80         moveml  %d1-%d5/%a0-%a1/%curptr,%sp@-
  81 .endm
  82
  83 .macro  save_all_sys
  84         clrl    %sp@-           | stk_adj
  85         movel   %d0,%sp@-       | orig d0
  86         movel   %d0,%sp@-       | d0
  87         moveml  %d1-%d5/%a0-%a1/%curptr,%sp@-
  88 .endm
  89 #else
  90 /* Need to save the "missing" registers for kgdb...
  91  */
  92 .macro  save_all_int
  93         clrl    %sp@-           | stk_adj
  94         pea     -1:w            | orig d0
  95         movel   %d0,%sp@-       | d0
  96         moveml  %d1-%d5/%a0-%a1/%curptr,%sp@-
  97         moveml  %d6-%d7,kgdb_registers+GDBOFFA_D6
  98         moveml  %a3-%a6,kgdb_registers+GDBOFFA_A3
  99 .endm
 100
 101 .macro  save_all_sys
 102         clrl    %sp@-           | stk_adj
 103         movel   %d0,%sp@-       | orig d0
 104         movel   %d0,%sp@-       | d0
 105         moveml  %d1-%d5/%a0-%a1/%curptr,%sp@-
 106         moveml  %d6-%d7,kgdb_registers+GDBOFFA_D6
 107         moveml  %a3-%a6,kgdb_registers+GDBOFFA_A3
 108 .endm
 109 #endif
 110
 111 .macro  restore_all
 112         moveml  %sp@+,%a0-%a1/%curptr/%d1-%d5
 113         movel   %sp@+,%d0
 114         addql   #4,%sp          | orig d0
 115         addl    %sp@+,%sp       | stk adj
 116         rte
 117 .endm
 118
 119 #define SWITCH_STACK_SIZE (6*4+4)       /* includes return address */
 120
 121 #define SAVE_SWITCH_STACK save_switch_stack
 122 #define RESTORE_SWITCH_STACK restore_switch_stack
 123 #define GET_CURRENT(tmp) get_current tmp
 124
 125 .macro  save_switch_stack
 126         moveml  %a3-%a6/%d6-%d7,%sp@-
 127 .endm
 128
 129 .macro  restore_switch_stack
 130         moveml  %sp@+,%a3-%a6/%d6-%d7
 131 .endm
 132
 133 .macro  get_current reg=%d0
 134         movel   %sp,\reg
 135         andw    #-8192,\reg
 136         movel   \reg,%curptr
 137 .endm
 138
 139 #else /* C source */
 140
 141 #define STR(X) STR1(X)
 142 #define STR1(X) #X
 143
 144 #define PT_OFF_ORIG_D0   0x24
 145 #define PT_OFF_FORMATVEC 0x32
 146 #define PT_OFF_SR        0x2C
 147 #ifndef CONFIG_KGDB
 148 #define SAVE_ALL_INT                            \
 149         "clrl   %%sp@-;"    /* stk_adj */       \
 150         "pea    -1:w;"      /* orig d0 = -1 */  \
 151         "movel  %%d0,%%sp@-;" /* d0 */          \
 152         "moveml %%d1-%%d5/%%a0-%%a2,%%sp@-"
 153 #else
 154 #define SAVE_ALL_INT                            \
 155         "clrl   %%sp@-\n\t" /* stk_adj */       \
 156         "pea    -1:w\n\t"   /* orig d0 = -1 */  \
 157         "movel  %%d0,%%sp@-\n\t" /* d0 */       \
 158         "moveml %%d1-%%d5/%%a0-%%a2,%%sp@-\n\t" \
 159         "moveml %%d6-%%d7,kgdb_registers+"STR(GDBOFFA_D6)"\n\t" \
 160         "moveml %%a3-%%a6,kgdb_registers+"STR(GDBOFFA_A3)
 161 #endif
 162 #define GET_CURRENT(tmp) \
 163         "movel  %%sp,"#tmp"\n\t" \
 164         "andw   #-8192,"#tmp"\n\t" \
 165         "movel  "#tmp",%%a2"
 166
 167 #endif
 168
 169 #endif /* __M68K_ENTRY_H */