1#ifndef __M68K_ENTRY_H 2#define __M68K_ENTRY_H 3 4#include <asm/setup.h> 5#include <asm/page.h> 6 7/* 8 * Stack layout in 'ret_from_exception': 9 * 10 * This allows access to the syscall arguments in registers d1-d5 11 * 12 * 0(sp) - d1 13 * 4(sp) - d2 14 * 8(sp) - d3 15 * C(sp) - d4 16 * 10(sp) - d5 17 * 14(sp) - a0 18 * 18(sp) - a1 19 * 1C(sp) - a2 20 * 20(sp) - d0 21 * 24(sp) - orig_d0 22 * 28(sp) - stack adjustment 23 * 2C(sp) - sr 24 * 2E(sp) - pc 25 * 32(sp) - format & vector 26 */ 27 28/* 29 * 97/05/14 Andreas: Register %a2 is now set to the current task throughout 30 * the whole kernel. 31 */ 32 33/* the following macro is used when enabling interrupts */ 34#if defined(MACH_ATARI_ONLY) 35 /* block out HSYNC on the atari */ 36#define ALLOWINT (~0x400) 37#define MAX_NOINT_IPL 3 38#else 39 /* portable version */ 40#define ALLOWINT (~0x700) 41#define MAX_NOINT_IPL 0 42#endif /* machine compilation types */ 43 44#ifdef __ASSEMBLY__ 45 46#define curptr a2 47 48LFLUSH_I_AND_D = 0x00000808 49 50/* process bits for task_struct.ptrace */ 51PT_TRACESYS_OFF = 3 52PT_TRACESYS_BIT = 1 53PT_PTRACED_OFF = 3 54PT_PTRACED_BIT = 0 55PT_DTRACE_OFF = 3 56PT_DTRACE_BIT = 2 57 58#define SAVE_ALL_INT save_all_int 59#define SAVE_ALL_SYS save_all_sys 60#define RESTORE_ALL restore_all 61/* 62 * This defines the normal kernel pt-regs layout. 63 * 64 * regs a3-a6 and d6-d7 are preserved by C code 65 * the kernel doesn't mess with usp unless it needs to 66 */ 67 68/* 69 * a -1 in the orig_d0 field signifies 70 * that the stack frame is NOT for syscall 71 */ 72.macro save_all_int 73 clrl %sp@- | stk_adj 74 pea -1:w | orig d0 75 movel %d0,%sp@- | d0 76 moveml %d1-%d5/%a0-%a1/%curptr,%sp@- 77.endm 78 79.macro save_all_sys 80 clrl %sp@- | stk_adj 81 movel %d0,%sp@- | orig d0 82 movel %d0,%sp@- | d0 83 moveml %d1-%d5/%a0-%a1/%curptr,%sp@- 84.endm 85 86.macro restore_all 87 moveml %sp@+,%a0-%a1/%curptr/%d1-%d5 88 movel %sp@+,%d0 89 addql #4,%sp | orig d0 90 addl %sp@+,%sp | stk adj 91 rte 92.endm 93 94#define SWITCH_STACK_SIZE (6*4+4) /* includes return address */ 95 96#define SAVE_SWITCH_STACK save_switch_stack 97#define RESTORE_SWITCH_STACK restore_switch_stack 98#define GET_CURRENT(tmp) get_current tmp 99 100.macro save_switch_stack 101 moveml %a3-%a6/%d6-%d7,%sp@- 102.endm 103 104.macro restore_switch_stack 105 moveml %sp@+,%a3-%a6/%d6-%d7 106.endm 107 108.macro get_current reg=%d0 109 movel %sp,\reg 110 andw #-THREAD_SIZE,\reg 111 movel \reg,%curptr 112 movel %curptr@,%curptr 113.endm 114 115#else /* C source */ 116 117#define STR(X) STR1(X) 118#define STR1(X) #X 119 120#define SAVE_ALL_INT \ 121 "clrl %%sp@-;" /* stk_adj */ \ 122 "pea -1:w;" /* orig d0 = -1 */ \ 123 "movel %%d0,%%sp@-;" /* d0 */ \ 124 "moveml %%d1-%%d5/%%a0-%%a2,%%sp@-" 125#define GET_CURRENT(tmp) \ 126 "movel %%sp,"#tmp"\n\t" \ 127 "andw #-"STR(THREAD_SIZE)","#tmp"\n\t" \ 128 "movel "#tmp",%%a2\n\t" \ 129 "movel %%a2@,%%a2" 130 131#endif 132 133#endif /* __M68K_ENTRY_H */ 134