kernel/tools/perf/arch/x86/util/unwind-libdw.c

   1 #include <elfutils/libdwfl.h>
   2 #include "../../util/unwind-libdw.h"
   3 #include "../../util/perf_regs.h"
   4
   5 bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
   6 {
   7         struct unwind_info *ui = arg;
   8         struct regs_dump *user_regs = &ui->sample->user_regs;
   9         Dwarf_Word dwarf_regs[17];
  10         unsigned nregs;
  11
  12 #define REG(r) ({                                               \
  13         Dwarf_Word val = 0;                                     \
  14         perf_reg_value(&val, user_regs, PERF_REG_X86_##r);      \
  15         val;                                                    \
  16 })
  17
  18         if (user_regs->abi == PERF_SAMPLE_REGS_ABI_32) {
  19                 dwarf_regs[0] = REG(AX);
  20                 dwarf_regs[1] = REG(CX);
  21                 dwarf_regs[2] = REG(DX);
  22                 dwarf_regs[3] = REG(BX);
  23                 dwarf_regs[4] = REG(SP);
  24                 dwarf_regs[5] = REG(BP);
  25                 dwarf_regs[6] = REG(SI);
  26                 dwarf_regs[7] = REG(DI);
  27                 dwarf_regs[8] = REG(IP);
  28                 nregs = 9;
  29         } else {
  30                 dwarf_regs[0]  = REG(AX);
  31                 dwarf_regs[1]  = REG(DX);
  32                 dwarf_regs[2]  = REG(CX);
  33                 dwarf_regs[3]  = REG(BX);
  34                 dwarf_regs[4]  = REG(SI);
  35                 dwarf_regs[5]  = REG(DI);
  36                 dwarf_regs[6]  = REG(BP);
  37                 dwarf_regs[7]  = REG(SP);
  38                 dwarf_regs[8]  = REG(R8);
  39                 dwarf_regs[9]  = REG(R9);
  40                 dwarf_regs[10] = REG(R10);
  41                 dwarf_regs[11] = REG(R11);
  42                 dwarf_regs[12] = REG(R12);
  43                 dwarf_regs[13] = REG(R13);
  44                 dwarf_regs[14] = REG(R14);
  45                 dwarf_regs[15] = REG(R15);
  46                 dwarf_regs[16] = REG(IP);
  47                 nregs = 17;
  48         }
  49
  50         return dwfl_thread_state_registers(thread, 0, nregs, dwarf_regs);
  51 }