arm64/util/unwind-libdw.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <elfutils/libdwfl.h>
0003 #include "../../../util/unwind-libdw.h"
0004 #include "../../../util/perf_regs.h"
0005 #include "../../../util/event.h"
0006
0007 bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
0008 {
0009     struct unwind_info *ui = arg;
0010     struct regs_dump *user_regs = &ui->sample->user_regs;
0011     Dwarf_Word dwarf_regs[PERF_REG_ARM64_MAX], dwarf_pc;
0012
0013 #define REG(r) ({                       \
0014     Dwarf_Word val = 0;                 \
0015     perf_reg_value(&val, user_regs, PERF_REG_ARM64_##r);    \
0016     val;                            \
0017 })
0018
0019     dwarf_regs[0]  = REG(X0);
0020     dwarf_regs[1]  = REG(X1);
0021     dwarf_regs[2]  = REG(X2);
0022     dwarf_regs[3]  = REG(X3);
0023     dwarf_regs[4]  = REG(X4);
0024     dwarf_regs[5]  = REG(X5);
0025     dwarf_regs[6]  = REG(X6);
0026     dwarf_regs[7]  = REG(X7);
0027     dwarf_regs[8]  = REG(X8);
0028     dwarf_regs[9]  = REG(X9);
0029     dwarf_regs[10] = REG(X10);
0030     dwarf_regs[11] = REG(X11);
0031     dwarf_regs[12] = REG(X12);
0032     dwarf_regs[13] = REG(X13);
0033     dwarf_regs[14] = REG(X14);
0034     dwarf_regs[15] = REG(X15);
0035     dwarf_regs[16] = REG(X16);
0036     dwarf_regs[17] = REG(X17);
0037     dwarf_regs[18] = REG(X18);
0038     dwarf_regs[19] = REG(X19);
0039     dwarf_regs[20] = REG(X20);
0040     dwarf_regs[21] = REG(X21);
0041     dwarf_regs[22] = REG(X22);
0042     dwarf_regs[23] = REG(X23);
0043     dwarf_regs[24] = REG(X24);
0044     dwarf_regs[25] = REG(X25);
0045     dwarf_regs[26] = REG(X26);
0046     dwarf_regs[27] = REG(X27);
0047     dwarf_regs[28] = REG(X28);
0048     dwarf_regs[29] = REG(X29);
0049     dwarf_regs[30] = REG(LR);
0050     dwarf_regs[31] = REG(SP);
0051
0052     if (!dwfl_thread_state_registers(thread, 0, PERF_REG_ARM64_MAX,
0053                      dwarf_regs))
0054         return false;
0055
0056     dwarf_pc = REG(PC);
0057     dwfl_thread_state_register_pc(thread, dwarf_pc);
0058
0059     return true;
0060 }