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perf/sdt/x86: Add renaming logic for (missing) 8 bit registers 

I found couple of events using al, bl, cl and dl registers for argument.
These are not directly accepted by uprobe_events and thus needs to be
mapped to ax, bx, cx and dx respectively.

Few ex,

  /usr/bin/qemu-system-s390x
    css_adapter_interrupt: 1@%bl
    css_chpid_add: 1@%cl 1@%sil 1@%dl
    dma_bdrv_io: 8@%rbx 8@%rbp -8@%r14 1@%al

  /usr/bin/postgres
    buffer__read__done: ... -1@-bash -1@%al
    buffer__read__start: ... -1@%al

I don't find any sdt events using ah, bh,... registers. But I also don't
see any reason to not use them, so there might be rare events using
these registers, and if so, perf should have a renaming logic for them
too.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexis Berlemont <alexis.berlemont@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170328094754.3156-2-ravi.bangoria@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ravi Bangoria 2017-03-28 15:17:52 +05:30 committed by Arnaldo Carvalho de Melo
parent c68677014b
commit 2d01ecc580
1 changed files with 8 additions and 0 deletions
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8
tools/perf/arch/x86/util/perf_regs.c
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@ -40,12 +40,20 @@ struct sdt_name_reg {
static const struct sdt_name_reg sdt_reg_renamings[] = {
SDT_NAME_REG(eax, ax),
SDT_NAME_REG(rax, ax),
SDT_NAME_REG(al, ax),
SDT_NAME_REG(ah, ax),
SDT_NAME_REG(ebx, bx),
SDT_NAME_REG(rbx, bx),
SDT_NAME_REG(bl, bx),
SDT_NAME_REG(bh, bx),
SDT_NAME_REG(ecx, cx),
SDT_NAME_REG(rcx, cx),
SDT_NAME_REG(cl, cx),
SDT_NAME_REG(ch, cx),
SDT_NAME_REG(edx, dx),
SDT_NAME_REG(rdx, dx),
SDT_NAME_REG(dl, dx),
SDT_NAME_REG(dh, dx),
SDT_NAME_REG(esi, si),
SDT_NAME_REG(rsi, si),
SDT_NAME_REG(sil, si),