#ifndef __M68K_ENTRY_H #define __M68K_ENTRY_H #include <linux/config.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) && !defined(CONFIG_HADES) /* 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 LSIGTRAP = 5 /* 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 PT_OFF_ORIG_D0 0x24 #define PT_OFF_FORMATVEC 0x32 #define PT_OFF_SR 0x2C #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 */