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check for supervisor protection fault and issue a bus error

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This commit is contained in:
Markus Fröschle
2014-09-07 19:29:11 +00:00
parent 87bd9eb2c6
commit e7fa2b5bff
2 changed files with 10 additions and 1 deletions
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8
BaS_gcc/sys/exceptions.S
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@@ -380,7 +380,7 @@ reset_vector:
jmp _rom_entry // no, cold start machine
access:
move.w #0x2700,sr // disable interrupt
move.w #0x2700,sr // disable interrupts
move.l d0,-(sp) // ++ vr
move.w 4(sp),d0 // get format_status word from stack
@@ -400,6 +400,12 @@ access_mmu:
move.l MCF_MMU_MMUSR,d0 // did the last fault hit in TLB?
btst #1,d0 // yes, it did. So we already mapped that page
bne bus_error // and this must be a real bus error
btst #5,d0 // supervisor protection fault?
bne bus_error
btst #4,d0 // read access fault?
bne bus_error
btst #3,d0 // write access fault?
bne bus_error
move.l MCF_MMU_MMUAR,d0
cmp.l #__FASTRAM_END,d0 // above max User RAM area?

3
BaS_gcc/sys/mmu.c
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@@ -235,6 +235,7 @@ int mmu_map_page(uint32_t virt, uint32_t phys, enum mmu_page_size sz, const stru
MCF_MMU_MMUTR_ID(flags->page_id) | /* address space id (ASID) */
MCF_MMU_MMUTR_SG | /* shared global */
MCF_MMU_MMUTR_V; /* valid */
NOP();
MCF_MMU_MMUDR = ((int) phys & size_mask) | /* physical address */
MCF_MMU_MMUDR_SZ(sz) | /* page size */
@@ -243,9 +244,11 @@ int mmu_map_page(uint32_t virt, uint32_t phys, enum mmu_page_size sz, const stru
(flags->access & ACCESS_WRITE ? MCF_MMU_MMUDR_W : 0) | /* write access enable */
(flags->access & ACCESS_EXECUTE ? MCF_MMU_MMUDR_X : 0) | /* execute access enable */
(flags->locked ? MCF_MMU_MMUDR_LK : 0);
NOP();
MCF_MMU_MMUOR = MCF_MMU_MMUOR_ACC | /* access TLB, data */
MCF_MMU_MMUOR_UAA; /* update allocation address field */
NOP();
MCF_MMU_MMUOR = MCF_MMU_MMUOR_ITLB | /* instruction */
MCF_MMU_MMUOR_ACC | /* access TLB */