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perf tools: Fix perf regs mask generation

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On some architectures (powerpc in particular), the number of registers
exceeds what can be represented in an integer bitmask. Ensure we
generate the proper bitmask on such platforms.

Fixes: 71ad0f5e4 ("perf tools: Support for DWARF CFI unwinding on post processing")
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Naveen N. Rao 2016-04-28 15:01:10 +05:30 • committed by Michael Ellerman
parent c4522469e6
commit f47822078d
1 changed files with 4 additions and 4 deletions
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8
tools/perf/util/perf_regs.c
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@ -12,18 +12,18 @@ int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
int i, idx = 0;
u64 mask = regs->mask;
if (regs->cache_mask & (1 << id))
if (regs->cache_mask & (1ULL << id))
goto out;
if (!(mask & (1 << id)))
if (!(mask & (1ULL << id)))
return -EINVAL;
for (i = 0; i < id; i++) {
if (mask & (1 << i))
if (mask & (1ULL << i))
idx++;
}
regs->cache_mask |= (1 << id);
regs->cache_mask |= (1ULL << id);
regs->cache_regs[id] = regs->regs[idx];
out: