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