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 49 LFLUSH_I_AND_D = 0x00000808 50 LSIGTRAP = 5 51 52 /* process bits for task_struct.ptrace */ 53 PT_TRACESYS_OFF = 3 54 PT_TRACESYS_BIT = 1 55 PT_PTRACED_OFF = 3 56 PT_PTRACED_BIT = 0 57 PT_DTRACE_OFF = 3 58 PT_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