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- #ifndef __M68K_ENTRY_H
- #define __M68K_ENTRY_H
-
- #include <linux/config.h>
- #include <asm/setup.h>
- #ifdef CONFIG_KGDB
- #include <asm/kgdb.h>
- #endif
-
- /*
- * 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.
- */
-
- #ifdef __ASSEMBLY__
-
- #define curptr a2
-
- /* the following macro is used when enabling interrupts */
- #if defined(MACH_ATARI_ONLY) && !defined(CONFIG_HADES)
- /* block out HSYNC on the atari */
- #define ALLOWINT 0xfbff
- #define MAX_NOINT_IPL 3
- #else
- /* portable version */
- #define ALLOWINT 0xf8ff
- #define MAX_NOINT_IPL 0
- #endif /* machine compilation types */
-
- LFLUSH_I_AND_D = 0x00000808
- LSIGTRAP = 5
-
- /* 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
-
- #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
- */
- #ifndef CONFIG_KGDB
- /*
- * 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
- #else
- /* Need to save the "missing" registers for kgdb...
- */
- .macro save_all_int
- clrl %sp@- | stk_adj
- pea -1:w | orig d0
- movel %d0,%sp@- | d0
- moveml %d1-%d5/%a0-%a1/%curptr,%sp@-
- moveml %d6-%d7,kgdb_registers+GDBOFFA_D6
- moveml %a3-%a6,kgdb_registers+GDBOFFA_A3
- .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@-
- moveml %d6-%d7,kgdb_registers+GDBOFFA_D6
- moveml %a3-%a6,kgdb_registers+GDBOFFA_A3
- .endm
- #endif
-
- .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 #-8192,\reg
- movel \reg,%curptr
- .endm
-
- #else /* C source */
-
- #define STR(X) STR1(X)
- #define STR1(X) #X
-
- #define PT_OFF_ORIG_D0 0x24
- #define PT_OFF_FORMATVEC 0x32
- #define PT_OFF_SR 0x2C
- #ifndef CONFIG_KGDB
- #define SAVE_ALL_INT \
- "clrl %%sp@-;" /* stk_adj */ \
- "pea -1:w;" /* orig d0 = -1 */ \
- "movel %%d0,%%sp@-;" /* d0 */ \
- "moveml %%d1-%%d5/%%a0-%%a2,%%sp@-"
- #else
- #define SAVE_ALL_INT \
- "clrl %%sp@-\n\t" /* stk_adj */ \
- "pea -1:w\n\t" /* orig d0 = -1 */ \
- "movel %%d0,%%sp@-\n\t" /* d0 */ \
- "moveml %%d1-%%d5/%%a0-%%a2,%%sp@-\n\t" \
- "moveml %%d6-%%d7,kgdb_registers+"STR(GDBOFFA_D6)"\n\t" \
- "moveml %%a3-%%a6,kgdb_registers+"STR(GDBOFFA_A3)
- #endif
- #define GET_CURRENT(tmp) \
- "movel %%sp,"#tmp"\n\t" \
- "andw #-8192,"#tmp"\n\t" \
- "movel "#tmp",%%a2"
-
- #endif
-
- #endif /* __M68K_ENTRY_H */
-