unwind-libdw.c

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#include <linux/kernel.h>
#include <elfutils/libdwfl.h>
#include "../../util/unwind-libdw.h"
#include "../../util/perf_regs.h"
#include "../../util/event.h"
#include "dwarf-regs-table.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[ARRAY_SIZE(s390_dwarf_regs)];

#define REG(r) ({                       \
    Dwarf_Word val = 0;                 \
    perf_reg_value(&val, user_regs, PERF_REG_S390_##r); \
    val;                            \
})
    /*
     * For DWARF register mapping details,
     * see also perf/arch/s390/include/dwarf-regs-table.h
     */
    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(R11);
    dwarf_regs[12] = REG(R12);
    dwarf_regs[13] = REG(R13);
    dwarf_regs[14] = REG(R14);
    dwarf_regs[15] = REG(R15);

    dwarf_regs[16] = REG(FP0);
    dwarf_regs[17] = REG(FP2);
    dwarf_regs[18] = REG(FP4);
    dwarf_regs[19] = REG(FP6);
    dwarf_regs[20] = REG(FP1);
    dwarf_regs[21] = REG(FP3);
    dwarf_regs[22] = REG(FP5);
    dwarf_regs[23] = REG(FP7);
    dwarf_regs[24] = REG(FP8);
    dwarf_regs[25] = REG(FP10);
    dwarf_regs[26] = REG(FP12);
    dwarf_regs[27] = REG(FP14);
    dwarf_regs[28] = REG(FP9);
    dwarf_regs[29] = REG(FP11);
    dwarf_regs[30] = REG(FP13);
    dwarf_regs[31] = REG(FP15);

    dwarf_regs[64] = REG(MASK);
    dwarf_regs[65] = REG(PC);

    dwfl_thread_state_register_pc(thread, dwarf_regs[65]);
    return dwfl_thread_state_registers(thread, 0, 32, dwarf_regs);
}