elfloader riscv

    uint64_t vm_mode = 0x8llu << 60;
    80203632:   57fd                    li      a5,-1
    80203634:   17fe                    slli    a5,a5,0x3f
    80203636:   fef43423                sd      a5,-24(s0)

    asm volatile("sfence.vma");
    8020363a:   12000073                sfence.vma

    asm volatile(
        "csrw sptbr, %0\n"
       :
       : "r" (vm_mode | (uintptr_t)l1pt >> RISCV_PGSHIFT)
    8020363e:   00007797                auipc   a5,0x7
    80203642:   9c278793                addi    a5,a5,-1598 # 8020a000 <l1pt>
    80203646:   00c7d713                srli    a4,a5,0xc
    8020364a:   fe843783                ld      a5,-24(s0)
    8020364e:   8fd9                    or      a5,a5,a4
    asm volatile(
    80203650:   18079073                csrw    sptbr,a5
       :
   );

    ((init_kernel_t)kernel_info.virt_entry)(user_info.phys_region_start,
    80203654:   00004797                auipc   a5,0x4
    80203658:   9ac78793                addi    a5,a5,-1620 # 80207000 <kernel_info>
    8020365c:   739c                    ld      a5,32(a5)
    8020365e:   883e                    mv      a6,a5
    80203660:   00002797                auipc   a5,0x2
    80203664:   9a078793                addi    a5,a5,-1632 # 80205000 <user_info>
    80203668:   6388                    ld      a0,0(a5)
    8020366a:   00002797                auipc   a5,0x2
    8020366e:   99678793                addi    a5,a5,-1642 # 80205000 <user_info>
    80203672:   678c                    ld      a1,8(a5)
                                            user_info.phys_region_end, user_info.phys_virt_offset,
    80203674:   00002797                auipc   a5,0x2
    80203678:   98c78793                addi    a5,a5,-1652 # 80205000 <user_info>
    8020367c:   779c                    ld      a5,40(a5)
    ((init_kernel_t)kernel_info.virt_entry)(user_info.phys_region_start,
    8020367e:   0007861b                sext.w  a2,a5
    80203682:   00002797                auipc   a5,0x2
    80203686:   97e78793                addi    a5,a5,-1666 # 80205000 <user_info>
    8020368a:   7394                    ld      a3,32(a5)
    8020368c:   00007717                auipc   a4,0x7
    80203690:   97470713                addi    a4,a4,-1676 # 8020a000 <l1pt>
    80203694:   6785                    lui     a5,0x1
    80203696:   97ba                    add     a5,a5,a4
    80203698:   ff87b783                ld      a5,-8(a5) # ff8 <_binary_archive_cpio_size-0x52cb68>
    8020369c:   873e                    mv      a4,a5
    8020369e:   9802                    jalr    a6