unwind-libdw.c

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// SPDX-License-Identifier: GPL-2.0
#include <elfutils/libdwfl.h>
#include "../../util/unwind-libdw.h"
#include "../../util/perf_regs.h"
#include "../../util/event.h"

bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
{
    struct unwind_info *ui = arg;
    struct regs_dump *user_regs = &ui->sample->user_regs;
    Dwarf_Word dwarf_regs[PERF_REG_ARM64_MAX], dwarf_pc;

#define REG(r) ({                       \
    Dwarf_Word val = 0;                 \
    perf_reg_value(&val, user_regs, PERF_REG_ARM64_##r);    \
    val;                            \
})

    dwarf_regs[0]  = REG(X0);
    dwarf_regs[1]  = REG(X1);
    dwarf_regs[2]  = REG(X2);
    dwarf_regs[3]  = REG(X3);
    dwarf_regs[4]  = REG(X4);
    dwarf_regs[5]  = REG(X5);
    dwarf_regs[6]  = REG(X6);
    dwarf_regs[7]  = REG(X7);
    dwarf_regs[8]  = REG(X8);
    dwarf_regs[9]  = REG(X9);
    dwarf_regs[10] = REG(X10);
    dwarf_regs[11] = REG(X11);
    dwarf_regs[12] = REG(X12);
    dwarf_regs[13] = REG(X13);
    dwarf_regs[14] = REG(X14);
    dwarf_regs[15] = REG(X15);
    dwarf_regs[16] = REG(X16);
    dwarf_regs[17] = REG(X17);
    dwarf_regs[18] = REG(X18);
    dwarf_regs[19] = REG(X19);
    dwarf_regs[20] = REG(X20);
    dwarf_regs[21] = REG(X21);
    dwarf_regs[22] = REG(X22);
    dwarf_regs[23] = REG(X23);
    dwarf_regs[24] = REG(X24);
    dwarf_regs[25] = REG(X25);
    dwarf_regs[26] = REG(X26);
    dwarf_regs[27] = REG(X27);
    dwarf_regs[28] = REG(X28);
    dwarf_regs[29] = REG(X29);
    dwarf_regs[30] = REG(LR);
    dwarf_regs[31] = REG(SP);

    if (!dwfl_thread_state_registers(thread, 0, PERF_REG_ARM64_MAX,
                     dwarf_regs))
        return false;

    dwarf_pc = REG(PC);
    dwfl_thread_state_register_pc(thread, dwarf_pc);

    return true;
}