forked from Minki/linux
f47822078d
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>
34 lines
570 B
C
34 lines
570 B
C
#include <errno.h>
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#include "perf_regs.h"
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#include "event.h"
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const struct sample_reg __weak sample_reg_masks[] = {
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SMPL_REG_END
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};
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#ifdef HAVE_PERF_REGS_SUPPORT
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int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)
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{
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int i, idx = 0;
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u64 mask = regs->mask;
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if (regs->cache_mask & (1ULL << id))
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goto out;
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if (!(mask & (1ULL << id)))
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return -EINVAL;
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for (i = 0; i < id; i++) {
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if (mask & (1ULL << i))
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idx++;
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}
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regs->cache_mask |= (1ULL << id);
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regs->cache_regs[id] = regs->regs[idx];
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out:
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*valp = regs->cache_regs[id];
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return 0;
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}
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#endif
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