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