262 lines
5.8 KiB
C
262 lines
5.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __M68K_ENTRY_H
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#define __M68K_ENTRY_H
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#include <asm/setup.h>
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#include <asm/page.h>
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#ifdef __ASSEMBLY__
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#include <asm/thread_info.h>
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#endif
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/*
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* Stack layout in 'ret_from_exception':
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*
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* This allows access to the syscall arguments in registers d1-d5
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*
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* 0(sp) - d1
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* 4(sp) - d2
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* 8(sp) - d3
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* C(sp) - d4
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* 10(sp) - d5
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* 14(sp) - a0
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* 18(sp) - a1
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* 1C(sp) - a2
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* 20(sp) - d0
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* 24(sp) - orig_d0
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* 28(sp) - stack adjustment
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* 2C(sp) - [ sr ] [ format & vector ]
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* 2E(sp) - [ pc-hiword ] [ sr ]
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* 30(sp) - [ pc-loword ] [ pc-hiword ]
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* 32(sp) - [ format & vector ] [ pc-loword ]
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* ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^
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* M68K COLDFIRE
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*/
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/* the following macro is used when enabling interrupts */
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#if defined(MACH_ATARI_ONLY)
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/* block out HSYNC = ipl 2 on the atari */
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#define ALLOWINT (~0x500)
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#else
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/* portable version */
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#define ALLOWINT (~0x700)
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#endif /* machine compilation types */
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#ifdef __ASSEMBLY__
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/*
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* This defines the normal kernel pt-regs layout.
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*
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* regs a3-a6 and d6-d7 are preserved by C code
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* the kernel doesn't mess with usp unless it needs to
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*/
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#define SWITCH_STACK_SIZE (6*4+4) /* includes return address */
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#ifdef CONFIG_COLDFIRE
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#ifdef CONFIG_COLDFIRE_SW_A7
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/*
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* This is made a little more tricky on older ColdFires. There is no
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* separate supervisor and user stack pointers. Need to artificially
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* construct a usp in software... When doing this we need to disable
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* interrupts, otherwise bad things will happen.
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*/
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.globl sw_usp
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.globl sw_ksp
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.macro SAVE_ALL_SYS
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move #0x2700,%sr /* disable intrs */
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btst #5,%sp@(2) /* from user? */
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bnes 6f /* no, skip */
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movel %sp,sw_usp /* save user sp */
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addql #8,sw_usp /* remove exception */
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movel sw_ksp,%sp /* kernel sp */
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subql #8,%sp /* room for exception */
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clrl %sp@- /* stkadj */
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movel %d0,%sp@- /* orig d0 */
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movel %d0,%sp@- /* d0 */
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lea %sp@(-32),%sp /* space for 8 regs */
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moveml %d1-%d5/%a0-%a2,%sp@
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movel sw_usp,%a0 /* get usp */
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movel %a0@-,%sp@(PT_OFF_PC) /* copy exception program counter */
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movel %a0@-,%sp@(PT_OFF_FORMATVEC)/*copy exception format/vector/sr */
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bra 7f
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6:
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clrl %sp@- /* stkadj */
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movel %d0,%sp@- /* orig d0 */
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movel %d0,%sp@- /* d0 */
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lea %sp@(-32),%sp /* space for 8 regs */
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moveml %d1-%d5/%a0-%a2,%sp@
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7:
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.endm
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.macro SAVE_ALL_INT
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SAVE_ALL_SYS
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moveq #-1,%d0 /* not system call entry */
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movel %d0,%sp@(PT_OFF_ORIG_D0)
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.endm
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.macro RESTORE_USER
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move #0x2700,%sr /* disable intrs */
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movel sw_usp,%a0 /* get usp */
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movel %sp@(PT_OFF_PC),%a0@- /* copy exception program counter */
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movel %sp@(PT_OFF_FORMATVEC),%a0@-/*copy exception format/vector/sr */
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moveml %sp@,%d1-%d5/%a0-%a2
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lea %sp@(32),%sp /* space for 8 regs */
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movel %sp@+,%d0
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addql #4,%sp /* orig d0 */
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addl %sp@+,%sp /* stkadj */
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addql #8,%sp /* remove exception */
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movel %sp,sw_ksp /* save ksp */
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subql #8,sw_usp /* set exception */
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movel sw_usp,%sp /* restore usp */
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rte
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.endm
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.macro RDUSP
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movel sw_usp,%a3
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.endm
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.macro WRUSP
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movel %a3,sw_usp
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.endm
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#else /* !CONFIG_COLDFIRE_SW_A7 */
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/*
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* Modern ColdFire parts have separate supervisor and user stack
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* pointers. Simple load and restore macros for this case.
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*/
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.macro SAVE_ALL_SYS
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move #0x2700,%sr /* disable intrs */
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clrl %sp@- /* stkadj */
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movel %d0,%sp@- /* orig d0 */
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movel %d0,%sp@- /* d0 */
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lea %sp@(-32),%sp /* space for 8 regs */
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moveml %d1-%d5/%a0-%a2,%sp@
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.endm
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.macro SAVE_ALL_INT
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move #0x2700,%sr /* disable intrs */
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clrl %sp@- /* stkadj */
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pea -1:w /* orig d0 */
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movel %d0,%sp@- /* d0 */
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lea %sp@(-32),%sp /* space for 8 regs */
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moveml %d1-%d5/%a0-%a2,%sp@
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.endm
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.macro RESTORE_USER
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moveml %sp@,%d1-%d5/%a0-%a2
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lea %sp@(32),%sp /* space for 8 regs */
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movel %sp@+,%d0
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addql #4,%sp /* orig d0 */
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addl %sp@+,%sp /* stkadj */
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rte
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.endm
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.macro RDUSP
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/*move %usp,%a3*/
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.word 0x4e6b
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.endm
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.macro WRUSP
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/*move %a3,%usp*/
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.word 0x4e63
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.endm
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#endif /* !CONFIG_COLDFIRE_SW_A7 */
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.macro SAVE_SWITCH_STACK
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lea %sp@(-24),%sp /* 6 regs */
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moveml %a3-%a6/%d6-%d7,%sp@
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.endm
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.macro RESTORE_SWITCH_STACK
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moveml %sp@,%a3-%a6/%d6-%d7
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lea %sp@(24),%sp /* 6 regs */
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.endm
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#else /* !CONFIG_COLDFIRE */
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/*
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* All other types of m68k parts (68000, 680x0, CPU32) have the same
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* entry and exit code.
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*/
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/*
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* a -1 in the orig_d0 field signifies
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* that the stack frame is NOT for syscall
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*/
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.macro SAVE_ALL_INT
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clrl %sp@- /* stk_adj */
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pea -1:w /* orig d0 */
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movel %d0,%sp@- /* d0 */
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moveml %d1-%d5/%a0-%a2,%sp@-
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.endm
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.macro SAVE_ALL_SYS
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clrl %sp@- /* stk_adj */
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movel %d0,%sp@- /* orig d0 */
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movel %d0,%sp@- /* d0 */
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moveml %d1-%d5/%a0-%a2,%sp@-
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.endm
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.macro RESTORE_ALL
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moveml %sp@+,%a0-%a2/%d1-%d5
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movel %sp@+,%d0
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addql #4,%sp /* orig d0 */
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addl %sp@+,%sp /* stk adj */
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rte
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.endm
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.macro SAVE_SWITCH_STACK
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moveml %a3-%a6/%d6-%d7,%sp@-
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.endm
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.macro RESTORE_SWITCH_STACK
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moveml %sp@+,%a3-%a6/%d6-%d7
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.endm
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#endif /* !CONFIG_COLDFIRE */
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/*
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* Register %a2 is reserved and set to current task on MMU enabled systems.
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* Non-MMU systems do not reserve %a2 in this way, and this definition is
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* not used for them.
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*/
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#ifdef CONFIG_MMU
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#define curptr a2
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#define GET_CURRENT(tmp) get_current tmp
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.macro get_current reg=%d0
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movel %sp,\reg
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andl #-THREAD_SIZE,\reg
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movel \reg,%curptr
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movel %curptr@,%curptr
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.endm
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#else
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#define GET_CURRENT(tmp)
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#endif /* CONFIG_MMU */
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#else /* C source */
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#define STR(X) STR1(X)
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#define STR1(X) #X
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#define SAVE_ALL_INT \
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"clrl %%sp@-;" /* stk_adj */ \
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"pea -1:w;" /* orig d0 = -1 */ \
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"movel %%d0,%%sp@-;" /* d0 */ \
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"moveml %%d1-%%d5/%%a0-%%a2,%%sp@-"
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#define GET_CURRENT(tmp) \
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"movel %%sp,"#tmp"\n\t" \
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"andw #-"STR(THREAD_SIZE)","#tmp"\n\t" \
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"movel "#tmp",%%a2\n\t" \
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"movel %%a2@,%%a2"
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#endif
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#endif /* __M68K_ENTRY_H */
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