redonkable/remarkable-linux
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[SPARC64]: Fix several bugs in flush_ptrace_access().

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1) Use cpudata cache line sizes, not magic constants.
2) Align start address in cheetah case so we do not get
   unaligned address traps.  (pgrep was good at triggering
   this, via /proc/${pid}/cmdline accesses)

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2005-09-29 18:50:34 -07:00
parent 4cb29d1812
commit 717463d806
1 changed files with 11 additions and 3 deletions
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14
arch/sparc64/kernel/ptrace.c
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@ -31,6 +31,7 @@
#include <asm/visasm.h>
#include <asm/spitfire.h>
#include <asm/page.h>
#include <asm/cpudata.h>
/* Returning from ptrace is a bit tricky because the syscall return
* low level code assumes any value returned which is negative and
@ -132,12 +133,16 @@ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
unsigned long start = __pa(kaddr);
unsigned long end = start + len;
unsigned long dcache_line_size;
dcache_line_size = local_cpu_data().dcache_line_size;
if (tlb_type == spitfire) {
for (; start < end; start += 32)
for (; start < end; start += dcache_line_size)
spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
} else {
for (; start < end; start += 32)
start &= ~(dcache_line_size - 1);
for (; start < end; start += dcache_line_size)
__asm__ __volatile__(
"stxa %%g0, [%0] %1\n\t"
"membar #Sync"
@ -150,8 +155,11 @@ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
if (write && tlb_type == spitfire) {
unsigned long start = (unsigned long) kaddr;
unsigned long end = start + len;
unsigned long icache_line_size;
for (; start < end; start += 32)
icache_line_size = local_cpu_data().icache_line_size;
for (; start < end; start += icache_line_size)
flushi(start);
}
}