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_ARM_MAX];

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

    dwarf_regs[0]  = REG(R0);
    dwarf_regs[1]  = REG(R1);
    dwarf_regs[2]  = REG(R2);
    dwarf_regs[3]  = REG(R3);
    dwarf_regs[4]  = REG(R4);
    dwarf_regs[5]  = REG(R5);
    dwarf_regs[6]  = REG(R6);
    dwarf_regs[7]  = REG(R7);
    dwarf_regs[8]  = REG(R8);
    dwarf_regs[9]  = REG(R9);
    dwarf_regs[10] = REG(R10);
    dwarf_regs[11] = REG(FP);
    dwarf_regs[12] = REG(IP);
    dwarf_regs[13] = REG(SP);
    dwarf_regs[14] = REG(LR);
    dwarf_regs[15] = REG(PC);

    return dwfl_thread_state_registers(thread, 0, PERF_REG_ARM_MAX,
                       dwarf_regs);
}