Firebee/FireBee_SVN
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

check for supervisor protection fault and issue a bus error

Browse Source
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
Download Patch File Download Diff File Expand all files Collapse all files

8
BaS_gcc/sys/exceptions.S
View File

@@ -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?