d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

powerpc/pmap: Add pmap_sync_icache() for radix pmap

Browse Source 
DTrace pid provider writes to user space to set breakpoints.  Failing to
sync the icache can lead to SIGTRAP.  Radix pmap is the only one missing
a pmap_sync_icache() method, so the pid provider would only potentially
crash a process on a POWER9 or later system.
This commit is contained in:
Justin Hibbits 2023-03-12 11:46:57 -04:00
parent 63715498ac
commit 6f0b2a235a
1 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
sys/powerpc/aim/mmu_radix.c
View File

@ -464,6 +464,7 @@ void mmu_radix_remove(pmap_t, vm_offset_t, vm_offset_t);
void mmu_radix_remove_all(vm_page_t);
void mmu_radix_remove_pages(pmap_t);
void mmu_radix_remove_write(vm_page_t);
void mmu_radix_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz);
void mmu_radix_unwire(pmap_t, vm_offset_t, vm_offset_t);
void mmu_radix_zero_page(vm_page_t);
void mmu_radix_zero_page_area(vm_page_t, int, int);
@ -542,6 +543,7 @@ static struct pmap_funcs mmu_radix_methods = {
.remove = mmu_radix_remove,
.remove_all = mmu_radix_remove_all,
.remove_write = mmu_radix_remove_write,
.sync_icache = mmu_radix_sync_icache,
.unwire = mmu_radix_unwire,
.zero_page = mmu_radix_zero_page,
.zero_page_area = mmu_radix_zero_page_area,
@ -5921,6 +5923,25 @@ mmu_radix_unmapdev(void *p, vm_size_t size)
}
}
void
mmu_radix_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz)
{
vm_paddr_t pa = 0;
int sync_sz;
while (sz > 0) {
pa = pmap_extract(pm, va);
sync_sz = PAGE_SIZE - (va & PAGE_MASK);
sync_sz = min(sync_sz, sz);
if (pa != 0) {
pa += (va & PAGE_MASK);
__syncicache((void *)PHYS_TO_DMAP(pa), sync_sz);
}
va += sync_sz;
sz -= sync_sz;
}
}
static __inline void
pmap_pte_attr(pt_entry_t *pte, uint64_t cache_bits, uint64_t mask)
{