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

…

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Arm-Trusted-Firmware代码分析

ATF

BL1