ATF

BL1

bl1_entrypoint

bl1/bl1.ld.S
ENTRY(bl1_entrypoint)

• el3_entrypoint_common

  _exception_vectors设置el3异常向量, MVBAR

  • bl1_exceptions

    • SynchronousExceptionA64

      • smc_handler64

        • BL1_SMC_RUN_IMAGE

        • smc_handler

          • bl1_smc_handler

            • bl1_fwu_smc_handler

• bl1_setup

  • bl1_early_platform_setup
  • bl1_plat_arch_setup

• pauth_init_enable_el3

  if ENABLE_PAUTH
  PAC

• bl1_main

  • bl1_arch_setup

  • auth_mod_init

    if TRUSTED_BOARD_BOOT

    • crypto_mod_init
    • img_parser_init

  • bl1_platform_setup

    • arm_bl1_platform_setup
    • soc_css_security_setup

  • bl1_plat_get_next_image_id

    • NS_BL2U_IMAGE_ID
    • BL2_IMAGE_ID

  • bl1_load_bl2

    image_id == BL2_IMAGE_ID

    • bl1_plat_get_image_desc

    • bl1_plat_handle_pre_image_load

    • load_auth_image

      • load_auth_image_internal

        • load_auth_image_recursive

          • load_image

          • auth_mod_verify_img

            • img_parser_check_integrity
            • auth_hash
            • auth_signature
            • auth_nvctr

        • load_image_flush

          • load_image

  • bl1_prepare_next_image

    • bl1_plat_get_image_desc

    • next_bl_ep->spsr

    • bl1_plat_set_ep_info

      Allow platform to make change

    • cm_init_my_context

      • cm_get_context

      • cm_setup_context

        • write_ctx_reg(state, CTX_SCR_EL3, scr_el3);
        • write_ctx_reg(state, CTX_ELR_EL3, ep->pc);
        • write_ctx_reg(state, CTX_SPSR_EL3, ep->spsr);

    • cm_prepare_el3_exit

      • cm_el1_sysregs_context_restore
      • cm_set_next_eret_context

    • desc->state = IMAGE_STATE_EXECUTED;

• el3_exit

BL2

bl2_entrypoint(BL2_AT_EL3)

bl2/bl2_el3.ld.S
ENTRY(bl2_entrypoint)
bl2/aarch64/bl2_el3_entrypoint.S

• el3_entrypoint_common

  • bl2_el3_exceptions

• bl2_el3_setup

  • bl2_el3_early_platform_setup
  • bl2_el3_plat_arch_setup

• pauth_init_enable_el3

• bl2_main

  • bl2_arch_setup

  • auth_mod_init

    • crypto_mod_init
    • img_parser_init

  • bl2_plat_preload_setup

    Fix PIE

  • bl2_load_images

  • pauth_disable_el1

  • bl2_run_next_image

bl2_entrypoint(!BL2_AT_EL3)

bl2/bl2.ld.S
ENTRY(bl2_entrypoint)
bl2/aarch32/bl2_entrypoint.S

• msr vbar_el1, x0 #early_exceptions

• RW memory

• BSS

• inv_dcache_range

  禁止数据cache

• plat_set_my_stack

• update_stack_protector_canary

• bl2_setup

  • bl2_early_platform_setup2
  • bl2_plat_arch_setup

• pauth_init_enable_el1

• bl2_main

  • bl2_arch_setup

  • auth_mod_init

    if TRUSTED_BOARD_BOOT

    • crypto_mod_init
    • img_parser_init

  • bl2_plat_preload_setup

    Fix PIE

  • bl2_load_images

    • plat_get_bl_image_load_info
    • bl2_plat_handle_pre_image_load
    • load_auth_image
    • bl2_plat_handle_post_image_load
    • plat_flush_next_bl_params

  • disable_mmu_icache_secure

  • pauth_disable_el1

  • smc(BL1_SMC_RUN_IMAGE, (unsigned long)next_bl_ep_info, 0, 0, 0, 0, 0, 0);

BL3

BL31

bl31/bl31.ld.S
ENTRY(bl31_entrypoint)

• bl31_entrypoint

  • el3_entrypoint_common

    • runtime_exceptions

      • sync_exception_aarch64

        • handle_sync_exception

          • smc_handler64
          • smc_handler32

      • sync_exception_aarch32

        • handle_sync_exception

  • bl31_setup

    • bl31_early_platform_setup2
    • bl31_plat_arch_setup

  • pauth_init_enable_el3

  • bl31_main

    • bl31_platform_setup

    • bl31_lib_init

    • runtime_svc_init

      • service = &RT_SVC_DESCS_START[index]

      • service->init()

      • rt_svc_descs_indices[start_idx] = index;

        根据service的call type和start oen确定唯一的index，并将所有call type映射到同一个index
        start_idx = (uint8_t)get_unique_oen(service->start_oen, service->call_type);
        end_idx = (uint8_t)get_unique_oen(service->end_oen, service->call_type);

    • (*bl32_init)()

      if (bl32_init != NULL)

    • bl31_prepare_next_image_entry

      • cm_init_my_context

        • cm_get_context

        • cm_setup_context

          • write_ctx_reg(state, CTX_SCR_EL3, scr_el3);
          • write_ctx_reg(state, CTX_ELR_EL3, ep->pc);
          • write_ctx_reg(state, CTX_SPSR_EL3, ep->spsr);

      • cm_prepare_el3_exit

        • cm_el1_sysregs_context_restore
        • cm_set_next_eret_context

    • bl31_plat_runtime_setup

  • el3_exit

BL32

BL33

RT_SVC_DESCS_START

DECLARE_RT_SVC

static const rt_svc_desc_t _svc_desc ## _name
__section(“rt_svc_descs”) __used = {
.start_oen = (_start),
.end_oen = (_end),
.call_type = (_type),
.name = #_name,
.init = (_setup),
.handle = (_smch)
}

tspd

• tspd_setup

  • bl31_register_bl32_init

    • bl32_init = &tspd_init

      • tspd_synchronous_sp_entry

• tspd_smc_handler

optee

• opteed_setup

  • bl31_plat_get_next_image_ep_info

  • opteed_init_optee_ep_state

  • bl31_register_bl32_init

    • bl32_init = &opteed_init

      • opteed_synchronous_sp_entry

• opteed_smc_handler

…