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perf callchain: Separate perf_reg_value function in perf_regs object
Making perf_reg_value function global (formely reg_value), because it's going to be used globaly across all code providing the dwarf post unwind feature. Changing its prototype to be generic: -int reg_value(unw_word_t *valp, struct regs_dump *regs, int id) +int perf_reg_value(u64 *valp, struct regs_dump *regs, int id); Changing the valp type from libunwind specific 'unw_word_t' to u64. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Jean Pihet <jean.pihet@linaro.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jean Pihet <jean.pihet@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1389098853-14466-13-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -538,6 +538,7 @@ ifeq ($(NO_PERF_REGS),0)
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ifeq ($(ARCH),x86)
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LIB_H += arch/x86/include/perf_regs.h
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endif
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LIB_OBJS += $(OUTPUT)util/perf_regs.o
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endif
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ifndef NO_LIBNUMA
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19
tools/perf/util/perf_regs.c
Normal file
19
tools/perf/util/perf_regs.c
Normal file
@ -0,0 +1,19 @@
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#include <errno.h>
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#include "perf_regs.h"
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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 (!(mask & (1 << id)))
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return -EINVAL;
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for (i = 0; i < id; i++) {
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if (mask & (1 << i))
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idx++;
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}
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*valp = regs->regs[idx];
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return 0;
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}
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@ -1,8 +1,14 @@
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#ifndef __PERF_REGS_H
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#define __PERF_REGS_H
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#include "types.h"
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#include "event.h"
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#ifdef HAVE_PERF_REGS_SUPPORT
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#include <perf_regs.h>
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int perf_reg_value(u64 *valp, struct regs_dump *regs, int id);
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#else
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#define PERF_REGS_MASK 0
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@ -10,5 +16,12 @@ static inline const char *perf_reg_name(int id __maybe_unused)
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{
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return NULL;
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}
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static inline int perf_reg_value(u64 *valp __maybe_unused,
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struct regs_dump *regs __maybe_unused,
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int id __maybe_unused)
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{
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return 0;
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}
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#endif /* HAVE_PERF_REGS_SUPPORT */
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#endif /* __PERF_REGS_H */
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@ -390,30 +390,13 @@ static int access_dso_mem(struct unwind_info *ui, unw_word_t addr,
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return !(size == sizeof(*data));
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}
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static int reg_value(unw_word_t *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 (!(mask & (1 << id)))
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return -EINVAL;
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for (i = 0; i < id; i++) {
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if (mask & (1 << i))
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idx++;
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}
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*valp = regs->regs[idx];
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return 0;
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}
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static int access_mem(unw_addr_space_t __maybe_unused as,
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unw_word_t addr, unw_word_t *valp,
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int __write, void *arg)
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{
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struct unwind_info *ui = arg;
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struct stack_dump *stack = &ui->sample->user_stack;
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unw_word_t start, end;
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u64 start, end;
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int offset;
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int ret;
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@ -423,7 +406,7 @@ static int access_mem(unw_addr_space_t __maybe_unused as,
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return 0;
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}
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ret = reg_value(&start, &ui->sample->user_regs, PERF_REG_SP);
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ret = perf_reg_value(&start, &ui->sample->user_regs, PERF_REG_SP);
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if (ret)
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return ret;
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@ -436,8 +419,9 @@ static int access_mem(unw_addr_space_t __maybe_unused as,
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if (addr < start || addr + sizeof(unw_word_t) >= end) {
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ret = access_dso_mem(ui, addr, valp);
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if (ret) {
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pr_debug("unwind: access_mem %p not inside range %p-%p\n",
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(void *)addr, (void *)start, (void *)end);
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pr_debug("unwind: access_mem %p not inside range"
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" 0x%" PRIx64 "-0x%" PRIx64 "\n",
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(void *) addr, start, end);
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*valp = 0;
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return ret;
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}
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@ -446,8 +430,8 @@ static int access_mem(unw_addr_space_t __maybe_unused as,
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offset = addr - start;
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*valp = *(unw_word_t *)&stack->data[offset];
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pr_debug("unwind: access_mem addr %p, val %lx, offset %d\n",
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(void *)addr, (unsigned long)*valp, offset);
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pr_debug("unwind: access_mem addr %p val %lx, offset %d\n",
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(void *) addr, (unsigned long)*valp, offset);
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return 0;
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}
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@ -457,6 +441,7 @@ static int access_reg(unw_addr_space_t __maybe_unused as,
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{
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struct unwind_info *ui = arg;
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int id, ret;
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u64 val;
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/* Don't support write, I suspect we don't need it. */
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if (__write) {
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@ -473,12 +458,13 @@ static int access_reg(unw_addr_space_t __maybe_unused as,
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if (id < 0)
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return -EINVAL;
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ret = reg_value(valp, &ui->sample->user_regs, id);
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ret = perf_reg_value(&val, &ui->sample->user_regs, id);
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if (ret) {
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pr_err("unwind: can't read reg %d\n", regnum);
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return ret;
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}
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*valp = (unw_word_t) val;
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pr_debug("unwind: reg %d, val %lx\n", regnum, (unsigned long)*valp);
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return 0;
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}
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@ -572,7 +558,7 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
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struct machine *machine, struct thread *thread,
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struct perf_sample *data, int max_stack)
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{
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unw_word_t ip;
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u64 ip;
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struct unwind_info ui = {
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.sample = data,
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.thread = thread,
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@ -583,7 +569,7 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
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if (!data->user_regs.regs)
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return -EINVAL;
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ret = reg_value(&ip, &data->user_regs, PERF_REG_IP);
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ret = perf_reg_value(&ip, &data->user_regs, PERF_REG_IP);
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if (ret)
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return ret;
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