diff options
Diffstat (limited to 'arch/m68k/include/asm/entry_no.h')
| -rw-r--r-- | arch/m68k/include/asm/entry_no.h | 59 |
1 files changed, 34 insertions, 25 deletions
diff --git a/arch/m68k/include/asm/entry_no.h b/arch/m68k/include/asm/entry_no.h index 26be277394f9..627d69bacc58 100644 --- a/arch/m68k/include/asm/entry_no.h +++ b/arch/m68k/include/asm/entry_no.h @@ -42,12 +42,16 @@ */ #ifdef CONFIG_COLDFIRE +#ifdef CONFIG_COLDFIRE_SW_A7 /* - * This is made a little more tricky on the ColdFire. There is no - * separate kernel and user stack pointers. Need to artificially + * 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 could happen. + * interrupts, otherwise bad things will happen. */ +.globl sw_usp +.globl sw_ksp + .macro SAVE_ALL move #0x2700,%sr /* disable intrs */ btst #5,%sp@(2) /* from user? */ @@ -74,9 +78,7 @@ 7: .endm -.macro RESTORE_ALL - btst #5,%sp@(PT_SR) /* going user? */ - bnes 8f /* no, skip */ +.macro RESTORE_USER move #0x2700,%sr /* disable intrs */ movel sw_usp,%a0 /* get usp */ movel %sp@(PT_OFF_PC),%a0@- /* copy exception program counter */ @@ -91,19 +93,22 @@ 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 +.macro RDUSP + movel sw_usp,%a2 +.endm + +.macro WRUSP + movel %a0,sw_usp +.endm + +#else /* !CONFIG_COLDFIRE_SW_A7 */ /* - * Quick exception save, use current stack only. + * Modern ColdFire parts have separate supervisor and user stack + * pointers. Simple load and restore macros for this case. */ -.macro SAVE_LOCAL +.macro SAVE_ALL move #0x2700,%sr /* disable intrs */ clrl %sp@- /* stkadj */ movel %d0,%sp@- /* orig d0 */ @@ -112,7 +117,7 @@ moveml %d1-%d5/%a0-%a2,%sp@ .endm -.macro RESTORE_LOCAL +.macro RESTORE_USER moveml %sp@,%d1-%d5/%a0-%a2 lea %sp@(32),%sp /* space for 8 regs */ movel %sp@+,%d0 @@ -121,6 +126,18 @@ rte .endm +.macro RDUSP + /*move %usp,%a2*/ + .word 0x4e6a +.endm + +.macro WRUSP + /*move %a0,%usp*/ + .word 0x4e60 +.endm + +#endif /* !CONFIG_COLDFIRE_SW_A7 */ + .macro SAVE_SWITCH_STACK lea %sp@(-24),%sp /* 6 regs */ moveml %a3-%a6/%d6-%d7,%sp@ @@ -131,14 +148,6 @@ 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 */ /* @@ -167,6 +176,6 @@ moveml %sp@+,%a3-%a6/%d6-%d7 .endm -#endif /* !CONFIG_COLDFIRE */ +#endif /* !COLDFIRE_SW_A7 */ #endif /* __ASSEMBLY__ */ #endif /* __M68KNOMMU_ENTRY_H */ |