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1c83af5f9d
The more modern ColdFire parts (even if based on older version cores) have separate user and supervisor stack pointers (a7 register). Modify the ColdFire CPU setup and exception code to enable and use this on parts that have it. Signed-off-by: Greg Ungerer <gerg@uclinux.org>
181 lines
4.1 KiB
C
181 lines
4.1 KiB
C
#ifndef __M68KNOMMU_ENTRY_H
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#define __M68KNOMMU_ENTRY_H
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#include <asm/setup.h>
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#include <asm/page.h>
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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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#define ALLOWINT (~0x700)
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#ifdef __ASSEMBLY__
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#define SWITCH_STACK_SIZE (6*4+4) /* Includes return address */
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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 are a2-a6 and d6-d7 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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#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
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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 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,%a2
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.endm
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.macro WRUSP
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movel %a0,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
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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 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,%a2*/
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.word 0x4e6a
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.endm
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.macro WRUSP
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/*move %a0,%usp*/
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.word 0x4e60
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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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* Standard 68k interrupt entry and exit macros.
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*/
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.macro SAVE_ALL
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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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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 /* stkadj */
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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 /* !COLDFIRE_SW_A7 */
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#endif /* __ASSEMBLY__ */
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#endif /* __M68KNOMMU_ENTRY_H */
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