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90fa9deb32
Adding dwarf unwind test, that setups live machine data over the perf test thread and does the remote unwind. Need to use -fno-optimize-sibling-calls for test compilation, otherwise 'krava_*' function calls are optimized into jumps and omitted from the stack unwind. So far it was enabled only for x86. Signed-off-by: Jean Pihet <jean.pihet@linaro.org> Reviewed-by: Will Deacon <will.deacon@arm.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.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: 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/1400229672-16104-3-git-send-email-jean.pihet@linaro.org Signed-off-by: Jiri Olsa <jolsa@kernel.org>
61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
#include <string.h>
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#include "perf_regs.h"
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#include "thread.h"
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#include "map.h"
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#include "event.h"
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#include "tests/tests.h"
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#define STACK_SIZE 8192
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static int sample_ustack(struct perf_sample *sample,
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struct thread *thread, u64 *regs)
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{
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struct stack_dump *stack = &sample->user_stack;
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struct map *map;
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unsigned long sp;
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u64 stack_size, *buf;
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buf = malloc(STACK_SIZE);
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if (!buf) {
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pr_debug("failed to allocate sample uregs data\n");
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return -1;
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}
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sp = (unsigned long) regs[PERF_REG_ARM_SP];
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map = map_groups__find(thread->mg, MAP__VARIABLE, (u64) sp);
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if (!map) {
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pr_debug("failed to get stack map\n");
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free(buf);
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return -1;
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}
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stack_size = map->end - sp;
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stack_size = stack_size > STACK_SIZE ? STACK_SIZE : stack_size;
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memcpy(buf, (void *) sp, stack_size);
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stack->data = (char *) buf;
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stack->size = stack_size;
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return 0;
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}
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int test__arch_unwind_sample(struct perf_sample *sample,
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struct thread *thread)
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{
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struct regs_dump *regs = &sample->user_regs;
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u64 *buf;
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buf = calloc(1, sizeof(u64) * PERF_REGS_MAX);
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if (!buf) {
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pr_debug("failed to allocate sample uregs data\n");
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return -1;
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}
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perf_regs_load(buf);
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regs->abi = PERF_SAMPLE_REGS_ABI;
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regs->regs = buf;
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regs->mask = PERF_REGS_MASK;
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return sample_ustack(sample, thread, buf);
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}
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