diff options
| author | Justin Hibbits <jhibbits@FreeBSD.org> | 2023-03-12 15:46:57 +0000 |
|---|---|---|
| committer | Justin Hibbits <jhibbits@FreeBSD.org> | 2023-03-15 20:06:29 +0000 |
| commit | ed2c3bda43fbd0bfad9e45c78a59fff8a62422da (patch) | |
| tree | 5026304aba90e3a779bd9ca9ce9f80db46245044 | |
| parent | 1026d170f4f70cdeb63cd05819c5557041e8ea94 (diff) | |
powerpc/pmap: Add pmap_sync_icache() for radix pmap
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.
(cherry picked from commit 6f0b2a235a133a381634ba9a7f5f477c64db9873)
| -rw-r--r-- | sys/powerpc/aim/mmu_radix.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/sys/powerpc/aim/mmu_radix.c b/sys/powerpc/aim/mmu_radix.c index 34736d5031bd..9f59d524196f 100644 --- a/sys/powerpc/aim/mmu_radix.c +++ b/sys/powerpc/aim/mmu_radix.c @@ -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); @@ -541,6 +542,7 @@ 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, @@ -5912,6 +5914,25 @@ mmu_radix_unmapdev(vm_offset_t va, 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) { |