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powerpc/watchpoint: Fix handling of vector instructions

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Vector load/store instructions are special because they are always
aligned. Thus unaligned EA needs to be aligned down before comparing
it with watch ranges. Otherwise we might consider valid event as
invalid.

Fixes: 74c6881019 ("powerpc/watchpoint: Prepare handler to handle more than one watchpoint")
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200902042945.129369-3-ravi.bangoria@linux.ibm.com
This commit is contained in:
Ravi Bangoria 2020-09-02 09:59:39 +05:30 committed by Michael Ellerman
parent 4759c11ed2
commit 4441eb0233
1 changed files with 2 additions and 0 deletions
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2
arch/powerpc/kernel/hw_breakpoint.c
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@ -644,6 +644,8 @@ static void get_instr_detail(struct pt_regs *regs, struct ppc_inst *instr,
if (*type == CACHEOP) {
*size = cache_op_size();
*ea &= ~(*size - 1);
} else if (*type == LOAD_VMX || *type == STORE_VMX) {
*ea &= ~(*size - 1);
}
}