gp_gp      uint64
	gp_tp      uint64
	gp_t       [7]uint64
	gp_s       [12]uint64
	gp_a       [8]uint64
	gp_sepc    uint64
	gp_sstatus uint64
}

type fpregs struct {
	fp_x     [64]uint64 // actually __uint64_t fp_x[32][2]
	fp_fcsr  uint64
	fp_flags int32
	pad      int32
}

type mcontext struct {
	mc_gpregs gpregs
	mc_fpregs fpregs
	mc_flags  int32
	mc_pad    int32

	si_uid    uint32
	si_status int32
	si_addr   uint64
	si_value  [8]byte
	_reason   [40]byte
}

type gpregs struct {
	gp_x    [30]uint64
	gp_lr   uint64
	gp_sp   uint64
	gp_elr  uint64
	gp_spsr uint32
	gp_pad  int32
}

type fpregs struct {
	fp_q     [64]uint64 // actually [32]uint128
	fp_sr    uint32
	fp_cr    uint32
	fp_flags int32
	fp_pad   int32
}

func (c *sigctxt) r7() uint64  { return c.regs().mc_gpregs.gp_x[7] }
func (c *sigctxt) r8() uint64  { return c.regs().mc_gpregs.gp_x[8] }
func (c *sigctxt) r9() uint64  { return c.regs().mc_gpregs.gp_x[9] }
func (c *sigctxt) r10() uint64 { return c.regs().mc_gpregs.gp_x[10] }
func (c *sigctxt) r11() uint64 { return c.regs().mc_gpregs.gp_x[11] }
func (c *sigctxt) r12() uint64 { return c.regs().mc_gpregs.gp_x[12] }

		return "ppc64"
	case elf.EM_S390:
		return "s390x"
	}
	return ""
}

func (f *elfFile) loadAddress() (uint64, error) {
	for _, p := range f.elf.Progs {
		if p.Type == elf.PT_LOAD && p.Flags&elf.PF_X != 0 {
			// The memory mapping that contains the segment
			// starts at an aligned address. Apparently this
			// is what pprof expects, as it uses this and the
			// start address of the mapping to compute PC