tools/testing/selftests/bpf/uprobe_multi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <stdbool.h>
   6 #include <stdint.h>
   7 #include <sys/mman.h>
   8 #include <unistd.h>
   9 #include <sdt.h>
  10
  11 #ifndef MADV_POPULATE_READ
  12 #define MADV_POPULATE_READ 22
  13 #endif
  14
  15 #ifndef MADV_PAGEOUT
  16 #define MADV_PAGEOUT 21
  17 #endif
  18
  19 int __attribute__((weak)) uprobe(void)
  20 {
  21         return 0;
  22 }
  23
  24 #define __PASTE(a, b) a##b
  25 #define PASTE(a, b) __PASTE(a, b)
  26
  27 #define NAME(name, idx) PASTE(name, idx)
  28
  29 #define DEF(name, idx) int __attribute__((weak)) NAME(name, idx)(void) { return 0; }
  30 #define CALL(name, idx) NAME(name, idx)();
  31
  32 #define F(body, name, idx) body(name, idx)
  33
  34 #define F10(body, name, idx) \
  35         F(body, PASTE(name, idx), 0) F(body, PASTE(name, idx), 1) F(body, PASTE(name, idx), 2) \
  36         F(body, PASTE(name, idx), 3) F(body, PASTE(name, idx), 4) F(body, PASTE(name, idx), 5) \
  37         F(body, PASTE(name, idx), 6) F(body, PASTE(name, idx), 7) F(body, PASTE(name, idx), 8) \
  38         F(body, PASTE(name, idx), 9)
  39
  40 #define F100(body, name, idx) \
  41         F10(body, PASTE(name, idx), 0) F10(body, PASTE(name, idx), 1) F10(body, PASTE(name, idx), 2) \
  42         F10(body, PASTE(name, idx), 3) F10(body, PASTE(name, idx), 4) F10(body, PASTE(name, idx), 5) \
  43         F10(body, PASTE(name, idx), 6) F10(body, PASTE(name, idx), 7) F10(body, PASTE(name, idx), 8) \
  44         F10(body, PASTE(name, idx), 9)
  45
  46 #define F1000(body, name, idx) \
  47         F100(body, PASTE(name, idx), 0) F100(body, PASTE(name, idx), 1) F100(body, PASTE(name, idx), 2) \
  48         F100(body, PASTE(name, idx), 3) F100(body, PASTE(name, idx), 4) F100(body, PASTE(name, idx), 5) \
  49         F100(body, PASTE(name, idx), 6) F100(body, PASTE(name, idx), 7) F100(body, PASTE(name, idx), 8) \
  50         F100(body, PASTE(name, idx), 9)
  51
  52 #define F10000(body, name, idx) \
  53         F1000(body, PASTE(name, idx), 0) F1000(body, PASTE(name, idx), 1) F1000(body, PASTE(name, idx), 2) \
  54         F1000(body, PASTE(name, idx), 3) F1000(body, PASTE(name, idx), 4) F1000(body, PASTE(name, idx), 5) \
  55         F1000(body, PASTE(name, idx), 6) F1000(body, PASTE(name, idx), 7) F1000(body, PASTE(name, idx), 8) \
  56         F1000(body, PASTE(name, idx), 9)
  57
  58 F10000(DEF, uprobe_multi_func_, 0)
  59 F10000(DEF, uprobe_multi_func_, 1)
  60 F10000(DEF, uprobe_multi_func_, 2)
  61 F10000(DEF, uprobe_multi_func_, 3)
  62 F10000(DEF, uprobe_multi_func_, 4)
  63
  64 static int bench(void)
  65 {
  66         F10000(CALL, uprobe_multi_func_, 0)
  67         F10000(CALL, uprobe_multi_func_, 1)
  68         F10000(CALL, uprobe_multi_func_, 2)
  69         F10000(CALL, uprobe_multi_func_, 3)
  70         F10000(CALL, uprobe_multi_func_, 4)
  71         return 0;
  72 }
  73
  74 #define PROBE STAP_PROBE(test, usdt);
  75
  76 #define PROBE10    PROBE PROBE PROBE PROBE PROBE \
  77                    PROBE PROBE PROBE PROBE PROBE
  78 #define PROBE100   PROBE10 PROBE10 PROBE10 PROBE10 PROBE10 \
  79                    PROBE10 PROBE10 PROBE10 PROBE10 PROBE10
  80 #define PROBE1000  PROBE100 PROBE100 PROBE100 PROBE100 PROBE100 \
  81                    PROBE100 PROBE100 PROBE100 PROBE100 PROBE100
  82 #define PROBE10000 PROBE1000 PROBE1000 PROBE1000 PROBE1000 PROBE1000 \
  83                    PROBE1000 PROBE1000 PROBE1000 PROBE1000 PROBE1000
  84
  85 static int usdt(void)
  86 {
  87         PROBE10000
  88         PROBE10000
  89         PROBE10000
  90         PROBE10000
  91         PROBE10000
  92         return 0;
  93 }
  94
  95 extern char build_id_start[];
  96 extern char build_id_end[];
  97
  98 int __attribute__((weak)) trigger_uprobe(bool build_id_resident)
  99 {
 100         int page_sz = sysconf(_SC_PAGESIZE);
 101         void *addr;
 102
 103         /* page-align build ID start */
 104         addr = (void *)((uintptr_t)&build_id_start & ~(page_sz - 1));
 105
 106         /* to guarantee MADV_PAGEOUT work reliably, we need to ensure that
 107          * memory range is mapped into current process, so we unconditionally
 108          * do MADV_POPULATE_READ, and then MADV_PAGEOUT, if necessary
 109          */
 110         madvise(addr, page_sz, MADV_POPULATE_READ);
 111         if (!build_id_resident)
 112                 madvise(addr, page_sz, MADV_PAGEOUT);
 113
 114         (void)uprobe();
 115
 116         return 0;
 117 }
 118
 119 int main(int argc, char **argv)
 120 {
 121         if (argc != 2)
 122                 goto error;
 123
 124         if (!strcmp("bench", argv[1]))
 125                 return bench();
 126         if (!strcmp("usdt", argv[1]))
 127                 return usdt();
 128         if (!strcmp("uprobe-paged-out", argv[1]))
 129                 return trigger_uprobe(false /* page-out build ID */);
 130         if (!strcmp("uprobe-paged-in", argv[1]))
 131                 return trigger_uprobe(true /* page-in build ID */);
 132
 133 error:
 134         fprintf(stderr, "usage: %s <bench|usdt>\n", argv[0]);
 135         return -1;
 136 }