#ifndef __M68KNOMMU_ENTRY_H #define __M68KNOMMU_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 ] [ format & vector ] * 2E(sp) - [ pc-hiword ] [ sr ] * 30(sp) - [ pc-loword ] [ pc-hiword ] * 32(sp) - [ format & vector ] [ pc-loword ] * ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^ * M68K COLDFIRE */ #define ALLOWINT 0xf8ff #ifdef __ASSEMBLY__ /* 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 LENOSYS = 38 #define SWITCH_STACK_SIZE (6*4+4) /* Includes return address */ /* * This defines the normal kernel pt-regs layout. * * regs are a2-a6 and d6-d7 preserved by C code * the kernel doesn't mess with usp unless it needs to */ #ifdef CONFIG_COLDFIRE /* * This is made a little more tricky on the ColdFire. There is no * separate kernel and user stack pointers. Need to artificially * construct a usp in software... When doing this we need to disable * interrupts, otherwise bad things could happen. */ .macro SAVE_ALL move #0x2700,%sr /* disable intrs */ btst #5,%sp@(2) /* from user? */ bnes 6f /* no, skip */ movel %sp,sw_usp /* save user sp */ addql #8,sw_usp /* remove exception */ movel sw_ksp,%sp /* kernel sp */ subql #8,%sp /* room for exception */ clrl %sp@- /* stkadj */ movel %d0,%sp@- /* orig d0 */ movel %d0,%sp@- /* d0 */ lea %sp@(-32),%sp /* space for 8 regs */ moveml %d1-%d5/%a0-%a2,%sp@ movel sw_usp,%a0 /* get usp */ movel %a0@-,%sp@(PT_PC) /* copy exception program counter */ movel %a0@-,%sp@(PT_FORMATVEC)/* copy exception format/vector/sr */ bra 7f 6: clrl %sp@- /* stkadj */ movel %d0,%sp@- /* orig d0 */ movel %d0,%sp@- /* d0 */ lea %sp@(-32),%sp /* space for 8 regs */ moveml %d1-%d5/%a0-%a2,%sp@ 7: .endm .macro RESTORE_ALL btst #5,%sp@(PT_SR) /* going user? */ bnes 8f /* no, skip */ move #0x2700,%sr /* disable intrs */ movel sw_usp,%a0 /* get usp */ movel %sp@(PT_PC),%a0@- /* copy exception program counter */ movel %sp@(PT_FORMATVEC),%a0@-/* copy exception format/vector/sr */ moveml %sp@,%d1-%d5/%a0-%a2 lea %sp@(32),%sp /* space for 8 regs */ movel %sp@+,%d0 addql #4,%sp /* orig d0 */ addl %sp@+,%sp /* stkadj */ addql #8,%sp /* remove exception */ movel %sp,sw_ksp /* save ksp */ subql #8,sw_usp /* set exception */ movel sw_usp,%sp /* restore usp */ rte 8: moveml %sp@,%d1-%d5/%a0-%a2 lea %sp@(32),%sp /* space for 8 regs */ movel %sp@+,%d0 addql #4,%sp /* orig d0 */ addl %sp@+,%sp /* stkadj */ rte .endm /* * Quick exception save, use current stack only. */ .macro SAVE_LOCAL move #0x2700,%sr /* disable intrs */ clrl %sp@- /* stkadj */ movel %d0,%sp@- /* orig d0 */ movel %d0,%sp@- /* d0 */ lea %sp@(-32),%sp /* space for 8 regs */ moveml %d1-%d5/%a0-%a2,%sp@ .endm .macro RESTORE_LOCAL moveml %sp@,%d1-%d5/%a0-%a2 lea %sp@(32),%sp /* space for 8 regs */ movel %sp@+,%d0 addql #4,%sp /* orig d0 */ addl %sp@+,%sp /* stkadj */ rte .endm .macro SAVE_SWITCH_STACK lea %sp@(-24),%sp /* 6 regs */ moveml %a3-%a6/%d6-%d7,%sp@ .endm .macro RESTORE_SWITCH_STACK moveml %sp@,%a3-%a6/%d6-%d7 lea %sp@(24),%sp /* 6 regs */ .endm /* * Software copy of the user and kernel stack pointers... Ugh... * Need these to get around ColdFire not having separate kernel * and user stack pointers. */ .globl sw_usp .globl sw_ksp #else /* !CONFIG_COLDFIRE */ /* * Standard 68k interrupt entry and exit macros. */ .macro SAVE_ALL clrl %sp@- /* stkadj */ movel %d0,%sp@- /* orig d0 */ movel %d0,%sp@- /* d0 */ moveml %d1-%d5/%a0-%a2,%sp@- .endm .macro RESTORE_ALL moveml %sp@+,%a0-%a2/%d1-%d5 movel %sp@+,%d0 addql #4,%sp /* orig d0 */ addl %sp@+,%sp /* stkadj */ rte .endm .macro SAVE_SWITCH_STACK moveml %a3-%a6/%d6-%d7,%sp@- .endm .macro RESTORE_SWITCH_STACK moveml %sp@+,%a3-%a6/%d6-%d7 .endm #endif /* !CONFIG_COLDFIRE */ #endif /* __ASSEMBLY__ */ #endif /* __M68KNOMMU_ENTRY_H */