nuttx-arm64-emulator 1.0.7

Emulate Apache NuttX RTOS for Arm64 with Unicorn Emulator (Avaota-A1 SBC)
nuttx-arm64-emulator-1.0.7 is not a library. 
flowchart TD
START --> arm64_head
arm64_head --> a527_lowputc
click arm64_head href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_head.S#L105" "arch/arm64/src/common/arm64_head.S " _blank
a527_lowputc --> arm64_head
click a527_lowputc href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/a527/a527_lowputc.S#L47" "arch/arm64/src/a527/a527_lowputc.S " _blank
arm64_head --> a527_lowputc
click arm64_head href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_head.S#L228" "arch/arm64/src/common/arm64_head.S " _blank
a527_lowputc --> arm64_head
click a527_lowputc href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/a527/a527_lowputc.S#L76" "arch/arm64/src/a527/a527_lowputc.S " _blank
arm64_head --> a527_lowputc
click arm64_head href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_head.S#L374" "arch/arm64/src/common/arm64_head.S " _blank
a527_lowputc --> arm64_head
click a527_lowputc href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/a527/a527_lowputc.S#L76" "arch/arm64/src/a527/a527_lowputc.S " _blank
arm64_head --> a527_lowputc
click arm64_head href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_head.S#L374" "arch/arm64/src/common/arm64_head.S " _blank
a527_lowputc --> arm64_head
click a527_lowputc href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/a527/a527_lowputc.S#L76" "arch/arm64/src/a527/a527_lowputc.S " _blank
arm64_head --> a527_lowputc
click arm64_head href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_head.S#L374" "arch/arm64/src/common/arm64_head.S " _blank
a527_lowputc --> arm64_head
click a527_lowputc href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/a527/a527_lowputc.S#L76" "arch/arm64/src/a527/a527_lowputc.S " _blank
arm64_head --> a527_lowputc
click arm64_head href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_head.S#L374" "arch/arm64/src/common/arm64_head.S " _blank
a527_lowputc --> arm64_head
click a527_lowputc href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/a527/a527_lowputc.S#L76" "arch/arm64/src/a527/a527_lowputc.S " _blank
arm64_head --> a527_lowputc
click arm64_head href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_head.S#L374" "arch/arm64/src/common/arm64_head.S " _blank
a527_lowputc --> arm64_head
click a527_lowputc href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/a527/a527_lowputc.S#L76" "arch/arm64/src/a527/a527_lowputc.S " _blank
arm64_head --> a527_lowputc
click arm64_head href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_head.S#L374" "arch/arm64/src/common/arm64_head.S " _blank
arm64_head --> arm64_el_init
click arm64_head href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_head.S#L374" "arch/arm64/src/common/arm64_head.S " _blank
arm64_head --> arm64_boot_el1_init
click arm64_head href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_head.S#L374" "arch/arm64/src/common/arm64_head.S " _blank
arm64_head --> arm64_boot_primary_c_routine
click arm64_head href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_head.S#L374" "arch/arm64/src/common/arm64_head.S " _blank
arm64_boot_primary_c_routine --> arm64_chip_boot
click arm64_boot_primary_c_routine href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_boot.c#L217" "arch/arm64/src/common/arm64_boot.c " _blank
arm64_chip_boot --> arm64_mmu_init
click arm64_chip_boot href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/a527/a527_boot.c#L231" "arch/arm64/src/a527/a527_boot.c " _blank
arm64_mmu_init --> setup_page_tables
click arm64_mmu_init href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L661" "arch/arm64/src/common/arm64_mmu.c " _blank
setup_page_tables --> init_xlat_tables
click setup_page_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L530" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> set_pte_block_desc
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L462" "arch/arm64/src/common/arm64_mmu.c " _blank
set_pte_block_desc --> init_xlat_tables
click set_pte_block_desc href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L333" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> setup_page_tables
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L477" "arch/arm64/src/common/arm64_mmu.c " _blank
setup_page_tables --> init_xlat_tables
click setup_page_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L544" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> pte_desc_type
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L462" "arch/arm64/src/common/arm64_mmu.c " _blank
pte_desc_type --> new_prealloc_table
click pte_desc_type href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L274" "arch/arm64/src/common/arm64_mmu.c " _blank
new_prealloc_table --> calculate_pte_index
click new_prealloc_table href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L418" "arch/arm64/src/common/arm64_mmu.c " _blank
calculate_pte_index --> pte_desc_type
click calculate_pte_index href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L286" "arch/arm64/src/common/arm64_mmu.c " _blank
pte_desc_type --> calculate_pte_index
click pte_desc_type href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L274" "arch/arm64/src/common/arm64_mmu.c " _blank
calculate_pte_index --> init_xlat_tables
click calculate_pte_index href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L287" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> set_pte_block_desc
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L487" "arch/arm64/src/common/arm64_mmu.c " _blank
set_pte_block_desc --> init_xlat_tables
click set_pte_block_desc href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L333" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> pte_desc_type
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L457" "arch/arm64/src/common/arm64_mmu.c " _blank
pte_desc_type --> init_xlat_tables
click pte_desc_type href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L274" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> calculate_pte_index
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L512" "arch/arm64/src/common/arm64_mmu.c " _blank
calculate_pte_index --> pte_desc_type
click calculate_pte_index href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L286" "arch/arm64/src/common/arm64_mmu.c " _blank
pte_desc_type --> calculate_pte_index
click pte_desc_type href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L274" "arch/arm64/src/common/arm64_mmu.c " _blank
calculate_pte_index --> init_xlat_tables
click calculate_pte_index href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L287" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> set_pte_block_desc
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L487" "arch/arm64/src/common/arm64_mmu.c " _blank
set_pte_block_desc --> init_xlat_tables
click set_pte_block_desc href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L333" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> pte_desc_type
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L457" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> calculate_pte_index
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L512" "arch/arm64/src/common/arm64_mmu.c " _blank
calculate_pte_index --> pte_desc_type
click calculate_pte_index href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L286" "arch/arm64/src/common/arm64_mmu.c " _blank
pte_desc_type --> calculate_pte_index
click pte_desc_type href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L274" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> set_pte_block_desc
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L487" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> pte_desc_type
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L457" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> calculate_pte_index
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L512" "arch/arm64/src/common/arm64_mmu.c " _blank
calculate_pte_index --> pte_desc_type
click calculate_pte_index href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L286" "arch/arm64/src/common/arm64_mmu.c " _blank
pte_desc_type --> calculate_pte_index
click pte_desc_type href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L274" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> set_pte_block_desc
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L487" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> set_pte_block_desc
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L487" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> set_pte_block_desc
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L487" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> set_pte_block_desc
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L487" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> setup_page_tables
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L477" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> new_prealloc_table
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L512" "arch/arm64/src/common/arm64_mmu.c " _blank
new_prealloc_table --> split_pte_block_desc
click new_prealloc_table href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L418" "arch/arm64/src/common/arm64_mmu.c " _blank
split_pte_block_desc --> set_pte_table_desc
click split_pte_block_desc href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L445" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> setup_page_tables
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L477" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> setup_page_tables
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L477" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> setup_page_tables
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L477" "arch/arm64/src/common/arm64_mmu.c " _blank
init_xlat_tables --> setup_page_tables
click init_xlat_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L477" "arch/arm64/src/common/arm64_mmu.c " _blank
setup_page_tables --> enable_mmu_el1
click setup_page_tables href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L555" "arch/arm64/src/common/arm64_mmu.c " _blank
enable_mmu_el1 --> arm64_mmu_init
click enable_mmu_el1 href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L605" "arch/arm64/src/common/arm64_mmu.c " _blank
arm64_mmu_init --> arm64_chip_boot
click arm64_mmu_init href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L712" "arch/arm64/src/common/arm64_mmu.c " _blank
arm64_chip_boot --> a527_boardinit
click arm64_chip_boot href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/a527/a527_boot.c#L254" "arch/arm64/src/a527/a527_boot.c " _blank
a527_boardinit --> arm64_chip_boot
click a527_boardinit href "https://github.com/apache/nuttx/blob/master/boards/arm64/a527/avaota-a1/src/a527_boardinit.c#L86" "boards/arm64/a527/avaota-a1/src/a527_boardinit.c " _blank
arm64_chip_boot --> arm64_earlyserialinit
click arm64_chip_boot href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/a527/a527_boot.c#L267" "arch/arm64/src/a527/a527_boot.c " _blank
arm64_earlyserialinit --> u16550_earlyserialinit
click arm64_earlyserialinit href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/a527/a527_serial.c#L58" "arch/arm64/src/a527/a527_serial.c " _blank
u16550_earlyserialinit --> u16550_setup
click u16550_earlyserialinit href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L1661" "drivers/serial/uart_16550.c " _blank
u16550_setup --> u16550_serialout
click u16550_setup href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L789" "drivers/serial/uart_16550.c " _blank
u16550_serialout --> u16550_mmio_putreg
click u16550_serialout href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L663" "drivers/serial/uart_16550.c " _blank
u16550_mmio_putreg --> u16550_setup
click u16550_mmio_putreg href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L635" "drivers/serial/uart_16550.c " _blank
u16550_setup --> u16550_serialin
click u16550_setup href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L813" "drivers/serial/uart_16550.c " _blank
u16550_serialin --> u16550_mmio_getreg
click u16550_serialin href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L650" "drivers/serial/uart_16550.c " _blank
u16550_mmio_getreg --> u16550_setup
click u16550_mmio_getreg href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L623" "drivers/serial/uart_16550.c " _blank
u16550_setup --> u16550_wait
click u16550_setup href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L813" "drivers/serial/uart_16550.c " _blank
u16550_wait --> u16550_serialin
click u16550_wait href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L683" "drivers/serial/uart_16550.c " _blank
u16550_serialin --> u16550_mmio_getreg
click u16550_serialin href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L650" "drivers/serial/uart_16550.c " _blank
u16550_mmio_getreg --> u16550_wait
click u16550_mmio_getreg href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L623" "drivers/serial/uart_16550.c " _blank
u16550_wait --> u16550_setup
click u16550_wait href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L690" "drivers/serial/uart_16550.c " _blank
u16550_setup --> u16550_serialout
click u16550_setup href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L855" "drivers/serial/uart_16550.c " _blank
u16550_serialout --> u16550_mmio_putreg
click u16550_serialout href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L663" "drivers/serial/uart_16550.c " _blank
u16550_mmio_putreg --> u16550_divisor
click u16550_mmio_putreg href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L635" "drivers/serial/uart_16550.c " _blank
u16550_divisor --> u16550_serialout
click u16550_divisor href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L765" "drivers/serial/uart_16550.c " _blank
u16550_serialout --> u16550_mmio_putreg
click u16550_serialout href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L663" "drivers/serial/uart_16550.c " _blank
u16550_mmio_putreg --> u16550_setup
click u16550_mmio_putreg href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L635" "drivers/serial/uart_16550.c " _blank
u16550_setup --> u16550_serialout
click u16550_setup href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L873" "drivers/serial/uart_16550.c " _blank
u16550_serialout --> u16550_mmio_putreg
click u16550_serialout href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L663" "drivers/serial/uart_16550.c " _blank
u16550_mmio_putreg --> u16550_setup
click u16550_mmio_putreg href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L635" "drivers/serial/uart_16550.c " _blank
u16550_setup --> u16550_wait
click u16550_setup href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L878" "drivers/serial/uart_16550.c " _blank
u16550_wait --> u16550_serialin
click u16550_wait href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L683" "drivers/serial/uart_16550.c " _blank
u16550_serialin --> u16550_mmio_getreg
click u16550_serialin href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L650" "drivers/serial/uart_16550.c " _blank
u16550_mmio_getreg --> u16550_wait
click u16550_mmio_getreg href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L623" "drivers/serial/uart_16550.c " _blank
u16550_wait --> u16550_setup
click u16550_wait href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L690" "drivers/serial/uart_16550.c " _blank
u16550_setup --> u16550_serialout
click u16550_setup href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L878" "drivers/serial/uart_16550.c " _blank
u16550_serialout --> u16550_mmio_putreg
click u16550_serialout href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L663" "drivers/serial/uart_16550.c " _blank
u16550_mmio_putreg --> u16550_setup
click u16550_mmio_putreg href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L635" "drivers/serial/uart_16550.c " _blank
u16550_setup --> u16550_serialout
click u16550_setup href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L893" "drivers/serial/uart_16550.c " _blank
u16550_serialout --> u16550_mmio_putreg
click u16550_serialout href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L663" "drivers/serial/uart_16550.c " _blank
u16550_setup --> arm64_boot_primary_c_routine
click u16550_setup href "https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L928" "drivers/serial/uart_16550.c " _blank
arm64_boot_primary_c_routine --> nx_start
click arm64_boot_primary_c_routine href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_boot.c#L220" "arch/arm64/src/common/arm64_boot.c " _blank
nx_start --> idle_task_initialize
click nx_start href "https://github.com/apache/nuttx/blob/master/sched/init/nx_start.c#L524" "sched/init/nx_start.c " _blank
idle_task_initialize --> nx_start
click idle_task_initialize href "https://github.com/apache/nuttx/blob/master/sched/init/nx_start.c#L362" "sched/init/nx_start.c " _blank
nx_start --> drivers_early_initialize
click nx_start href "https://github.com/apache/nuttx/blob/master/sched/init/nx_start.c#L543" "sched/init/nx_start.c " _blank
drivers_early_initialize --> nx_start
click drivers_early_initialize href "https://github.com/apache/nuttx/blob/master/drivers/drivers_initialize.c#L95" "drivers/drivers_initialize.c " _blank
nx_start --> up_allocate_kheap
click nx_start href "https://github.com/apache/nuttx/blob/master/sched/init/nx_start.c#L581" "sched/init/nx_start.c " _blank
up_allocate_kheap --> nx_start
click up_allocate_kheap href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_allocateheap.c#L129" "arch/arm64/src/common/arm64_allocateheap.c " _blank
nx_start --> kmm_initialize
click nx_start href "https://github.com/apache/nuttx/blob/master/sched/init/nx_start.c#L582" "sched/init/nx_start.c " _blank
kmm_initialize --> mm_initialize
click kmm_initialize href "https://github.com/apache/nuttx/blob/master/mm/kmm_heap/kmm_initialize.c#L61" "mm/kmm_heap/kmm_initialize.c " _blank
mm_initialize --> nxmutex_init
click mm_initialize href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_initialize.c#L234" "mm/mm_heap/mm_initialize.c " _blank
nxmutex_init --> nxsem_init
click nxmutex_init href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L114" "libs/libc/misc/lib_mutex.c " _blank
nxsem_init --> nxmutex_init
click nxsem_init href "https://github.com/apache/nuttx/blob/master/libs/libc/semaphore/sem_init.c#L68" "libs/libc/semaphore/sem_init.c " _blank
nxmutex_init --> nxsem_set_protocol
click nxmutex_init href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L115" "libs/libc/misc/lib_mutex.c " _blank
nxsem_set_protocol --> nxmutex_init
click nxsem_set_protocol href "https://github.com/apache/nuttx/blob/master/libs/libc/semaphore/sem_setprotocol.c#L79" "libs/libc/semaphore/sem_setprotocol.c " _blank
nxmutex_init --> mm_initialize
click nxmutex_init href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L129" "libs/libc/misc/lib_mutex.c " _blank
mm_initialize --> mm_addregion
click mm_initialize href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_initialize.c#L286" "mm/mm_heap/mm_initialize.c " _blank
mm_addregion --> mm_lock
click mm_addregion href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_initialize.c#L104" "mm/mm_heap/mm_initialize.c " _blank
mm_lock --> nxsched_gettid
click mm_lock href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L60" "mm/mm_heap/mm_lock.c " _blank
nxsched_gettid --> mm_lock
click nxsched_gettid href "https://github.com/apache/nuttx/blob/master/sched/task/task_gettid.c#L68" "sched/task/task_gettid.c " _blank
mm_lock --> nxmutex_lock
click mm_lock href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L90" "mm/mm_heap/mm_lock.c " _blank
nxmutex_lock --> nxmutex_is_hold
click nxmutex_lock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L248" "libs/libc/misc/lib_mutex.c " _blank
nxmutex_is_hold --> nxsched_gettid
click nxmutex_is_hold href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L178" "libs/libc/misc/lib_mutex.c " _blank
nxsched_gettid --> nxmutex_is_hold
click nxsched_gettid href "https://github.com/apache/nuttx/blob/master/sched/task/task_gettid.c#L68" "sched/task/task_gettid.c " _blank
nxmutex_is_hold --> nxmutex_lock
click nxmutex_is_hold href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L179" "libs/libc/misc/lib_mutex.c " _blank
nxmutex_lock --> nxsem_wait
click nxmutex_lock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L251" "libs/libc/misc/lib_mutex.c " _blank
nxsem_wait --> nxmutex_lock
click nxsem_wait href "https://github.com/apache/nuttx/blob/master/sched/semaphore/sem_wait.c#L257" "sched/semaphore/sem_wait.c " _blank
nxmutex_lock --> nxsched_gettid
click nxmutex_lock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L256" "libs/libc/misc/lib_mutex.c " _blank
nxsched_gettid --> nxmutex_lock
click nxsched_gettid href "https://github.com/apache/nuttx/blob/master/sched/task/task_gettid.c#L68" "sched/task/task_gettid.c " _blank
nxmutex_lock --> mm_addregion
click nxmutex_lock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L259" "libs/libc/misc/lib_mutex.c " _blank
mm_addregion --> mm_addfreechunk
click mm_addregion href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_initialize.c#L125" "mm/mm_heap/mm_initialize.c " _blank
mm_addfreechunk --> mm_size2ndx
click mm_addfreechunk href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm.h#L326" "mm/mm_heap/mm.h " _blank
mm_size2ndx --> mm_addfreechunk
click mm_size2ndx href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm.h#L314" "mm/mm_heap/mm.h " _blank
mm_addfreechunk --> mm_addregion
click mm_addfreechunk href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm.h#L335" "mm/mm_heap/mm.h " _blank
mm_addregion --> mm_unlock
click mm_addregion href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_initialize.c#L207" "mm/mm_heap/mm_initialize.c " _blank
mm_unlock --> nxmutex_unlock
click mm_unlock href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L111" "mm/mm_heap/mm_lock.c " _blank
nxmutex_unlock --> nxmutex_is_hold
click nxmutex_unlock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L423" "libs/libc/misc/lib_mutex.c " _blank
nxmutex_is_hold --> nxsched_gettid
click nxmutex_is_hold href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L178" "libs/libc/misc/lib_mutex.c " _blank
nxsched_gettid --> nxmutex_is_hold
click nxsched_gettid href "https://github.com/apache/nuttx/blob/master/sched/task/task_gettid.c#L68" "sched/task/task_gettid.c " _blank
nxmutex_is_hold --> nxmutex_unlock
click nxmutex_is_hold href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L179" "libs/libc/misc/lib_mutex.c " _blank
nxmutex_unlock --> nxsem_post
click nxmutex_unlock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L431" "libs/libc/misc/lib_mutex.c " _blank
nxsem_post --> nxmutex_unlock
click nxsem_post href "https://github.com/apache/nuttx/blob/master/sched/semaphore/sem_post.c#L254" "sched/semaphore/sem_post.c " _blank
nxmutex_unlock --> mm_unlock
click nxmutex_unlock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L435" "libs/libc/misc/lib_mutex.c " _blank
mm_unlock --> mm_initialize
click mm_unlock href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L117" "mm/mm_heap/mm_lock.c " _blank
mm_initialize --> procfs_register_meminfo
click mm_initialize href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_initialize.c#L290" "mm/mm_heap/mm_initialize.c " _blank
procfs_register_meminfo --> mm_initialize
click procfs_register_meminfo href "https://github.com/apache/nuttx/blob/master/fs/procfs/fs_procfsmeminfo.c#L720" "fs/procfs/fs_procfsmeminfo.c " _blank
mm_initialize --> kmm_initialize
click mm_initialize href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_initialize.c#L295" "mm/mm_heap/mm_initialize.c " _blank
kmm_initialize --> nx_start
click kmm_initialize href "https://github.com/apache/nuttx/blob/master/mm/kmm_heap/kmm_initialize.c#L62" "mm/kmm_heap/kmm_initialize.c " _blank
nx_start --> up_allocate_pgheap
click nx_start href "https://github.com/apache/nuttx/blob/master/sched/init/nx_start.c#L591" "sched/init/nx_start.c " _blank
up_allocate_pgheap --> nx_start
click up_allocate_pgheap href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_pgalloc.c#L172" "arch/arm64/src/common/arm64_pgalloc.c " _blank
nx_start --> mm_pginitialize
click nx_start href "https://github.com/apache/nuttx/blob/master/sched/init/nx_start.c#L592" "sched/init/nx_start.c " _blank
mm_pginitialize --> gran_initialize
click mm_pginitialize href "https://github.com/apache/nuttx/blob/master/mm/mm_gran/mm_pgalloc.c#L99" "mm/mm_gran/mm_pgalloc.c " _blank
gran_initialize --> kmm_zalloc
click gran_initialize href "https://github.com/apache/nuttx/blob/master/mm/mm_gran/mm_graninit.c#L97" "mm/mm_gran/mm_graninit.c " _blank
kmm_zalloc --> mm_zalloc
click kmm_zalloc href "https://github.com/apache/nuttx/blob/master/mm/kmm_heap/kmm_zalloc.c#L52" "mm/kmm_heap/kmm_zalloc.c " _blank
mm_zalloc --> mm_malloc
click mm_zalloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_zalloc.c#L45" "mm/mm_heap/mm_zalloc.c " _blank
mm_malloc --> free_delaylist
click mm_malloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L170" "mm/mm_heap/mm_malloc.c " _blank
free_delaylist --> up_irq_save
click free_delaylist href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L58" "mm/mm_heap/mm_malloc.c " _blank
up_irq_save --> mm_lock_irq
click up_irq_save href "https://github.com/apache/nuttx/blob/master/arch/arm64/include/irq.h#L349" "arch/arm64/include/irq.h " _blank
mm_lock_irq --> free_delaylist
click mm_lock_irq href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L132" "mm/mm_heap/mm_lock.c " _blank
free_delaylist --> up_irq_restore
click free_delaylist href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L85" "mm/mm_heap/mm_malloc.c " _blank
up_irq_restore --> mm_unlock_irq
click up_irq_restore href "https://github.com/apache/nuttx/blob/master/arch/arm64/include/irq.h#L382" "arch/arm64/include/irq.h " _blank
mm_unlock_irq --> free_delaylist
click mm_unlock_irq href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L146" "mm/mm_heap/mm_lock.c " _blank
free_delaylist --> mm_malloc
click free_delaylist href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L91" "mm/mm_heap/mm_malloc.c " _blank
mm_malloc --> mm_lock
click mm_malloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L197" "mm/mm_heap/mm_malloc.c " _blank
mm_lock --> nxsched_gettid
click mm_lock href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L60" "mm/mm_heap/mm_lock.c " _blank
nxsched_gettid --> mm_lock
click nxsched_gettid href "https://github.com/apache/nuttx/blob/master/sched/task/task_gettid.c#L68" "sched/task/task_gettid.c " _blank
mm_lock --> nxmutex_lock
click mm_lock href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L90" "mm/mm_heap/mm_lock.c " _blank
nxmutex_lock --> nxmutex_is_hold
click nxmutex_lock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L248" "libs/libc/misc/lib_mutex.c " _blank
nxmutex_is_hold --> nxsched_gettid
click nxmutex_is_hold href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L178" "libs/libc/misc/lib_mutex.c " _blank
nxsched_gettid --> nxmutex_is_hold
click nxsched_gettid href "https://github.com/apache/nuttx/blob/master/sched/task/task_gettid.c#L68" "sched/task/task_gettid.c " _blank
nxmutex_is_hold --> nxmutex_lock
click nxmutex_is_hold href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L179" "libs/libc/misc/lib_mutex.c " _blank
nxmutex_lock --> nxsem_wait
click nxmutex_lock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L251" "libs/libc/misc/lib_mutex.c " _blank
nxsem_wait --> nxmutex_lock
click nxsem_wait href "https://github.com/apache/nuttx/blob/master/sched/semaphore/sem_wait.c#L257" "sched/semaphore/sem_wait.c " _blank
nxmutex_lock --> nxsched_gettid
click nxmutex_lock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L256" "libs/libc/misc/lib_mutex.c " _blank
nxsched_gettid --> nxmutex_lock
click nxsched_gettid href "https://github.com/apache/nuttx/blob/master/sched/task/task_gettid.c#L68" "sched/task/task_gettid.c " _blank
nxmutex_lock --> mm_malloc
click nxmutex_lock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L259" "libs/libc/misc/lib_mutex.c " _blank
mm_malloc --> mm_size2ndx
click mm_malloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L214" "mm/mm_heap/mm_malloc.c " _blank
mm_size2ndx --> mm_malloc
click mm_size2ndx href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm.h#L314" "mm/mm_heap/mm.h " _blank
mm_malloc --> mm_addfreechunk
click mm_malloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L227" "mm/mm_heap/mm_malloc.c " _blank
mm_addfreechunk --> mm_size2ndx
click mm_addfreechunk href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm.h#L326" "mm/mm_heap/mm.h " _blank
mm_size2ndx --> mm_addfreechunk
click mm_size2ndx href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm.h#L314" "mm/mm_heap/mm.h " _blank
mm_addfreechunk --> mm_malloc
click mm_addfreechunk href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm.h#L341" "mm/mm_heap/mm.h " _blank
mm_malloc --> mm_heapmember
click mm_malloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L311" "mm/mm_heap/mm_malloc.c " _blank
mm_heapmember --> mm_malloc
click mm_heapmember href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_heapmember.c#L85" "mm/mm_heap/mm_heapmember.c " _blank
mm_malloc --> mm_unlock
click mm_malloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L322" "mm/mm_heap/mm_malloc.c " _blank
mm_unlock --> nxmutex_unlock
click mm_unlock href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L111" "mm/mm_heap/mm_lock.c " _blank
nxmutex_unlock --> nxmutex_is_hold
click nxmutex_unlock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L423" "libs/libc/misc/lib_mutex.c " _blank
nxmutex_is_hold --> nxsched_gettid
click nxmutex_is_hold href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L178" "libs/libc/misc/lib_mutex.c " _blank
nxsched_gettid --> nxmutex_is_hold
click nxsched_gettid href "https://github.com/apache/nuttx/blob/master/sched/task/task_gettid.c#L68" "sched/task/task_gettid.c " _blank
nxmutex_is_hold --> nxmutex_unlock
click nxmutex_is_hold href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L179" "libs/libc/misc/lib_mutex.c " _blank
nxmutex_unlock --> nxsem_post
click nxmutex_unlock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L431" "libs/libc/misc/lib_mutex.c " _blank
nxsem_post --> nxmutex_unlock
click nxsem_post href "https://github.com/apache/nuttx/blob/master/sched/semaphore/sem_post.c#L254" "sched/semaphore/sem_post.c " _blank
nxmutex_unlock --> mm_unlock
click nxmutex_unlock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L435" "libs/libc/misc/lib_mutex.c " _blank
mm_unlock --> mm_malloc
click mm_unlock href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L117" "mm/mm_heap/mm_lock.c " _blank
mm_malloc --> mm_zalloc
click mm_malloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L410" "mm/mm_heap/mm_malloc.c " _blank
mm_zalloc --> gran_initialize
click mm_zalloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_zalloc.c#L46" "mm/mm_heap/mm_zalloc.c " _blank
gran_initialize --> nxmutex_init
click gran_initialize href "https://github.com/apache/nuttx/blob/master/mm/mm_gran/mm_graninit.c#L130" "mm/mm_gran/mm_graninit.c " _blank
nxmutex_init --> nxsem_init
click nxmutex_init href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L114" "libs/libc/misc/lib_mutex.c " _blank
nxsem_init --> nxmutex_init
click nxsem_init href "https://github.com/apache/nuttx/blob/master/libs/libc/semaphore/sem_init.c#L68" "libs/libc/semaphore/sem_init.c " _blank
nxmutex_init --> nxsem_set_protocol
click nxmutex_init href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L115" "libs/libc/misc/lib_mutex.c " _blank
nxsem_set_protocol --> nxmutex_init
click nxsem_set_protocol href "https://github.com/apache/nuttx/blob/master/libs/libc/semaphore/sem_setprotocol.c#L79" "libs/libc/semaphore/sem_setprotocol.c " _blank
nxmutex_init --> gran_initialize
click nxmutex_init href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L129" "libs/libc/misc/lib_mutex.c " _blank
gran_initialize --> mm_pginitialize
click gran_initialize href "https://github.com/apache/nuttx/blob/master/mm/mm_gran/mm_graninit.c#L148" "mm/mm_gran/mm_graninit.c " _blank
mm_pginitialize --> nx_start
click mm_pginitialize href "https://github.com/apache/nuttx/blob/master/mm/mm_gran/mm_pgalloc.c#L100" "mm/mm_gran/mm_pgalloc.c " _blank
nx_start --> kmm_map_initialize
click nx_start href "https://github.com/apache/nuttx/blob/master/sched/init/nx_start.c#L600" "sched/init/nx_start.c " _blank
kmm_map_initialize --> up_addrenv_kmap_init
click kmm_map_initialize href "https://github.com/apache/nuttx/blob/master/mm/kmap/kmm_map.c#L283" "mm/kmap/kmm_map.c " _blank
up_addrenv_kmap_init --> mmu_get_base_pgt_level
click up_addrenv_kmap_init href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_addrenv_pgmap.c#L192" "arch/arm64/src/common/arm64_addrenv_pgmap.c " _blank
mmu_get_base_pgt_level --> up_addrenv_kmap_init
click mmu_get_base_pgt_level href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L794" "arch/arm64/src/common/arm64_mmu.c " _blank
up_addrenv_kmap_init --> arm64_pgvaddr
click up_addrenv_kmap_init href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_addrenv_pgmap.c#L204" "arch/arm64/src/common/arm64_addrenv_pgmap.c " _blank
arm64_pgvaddr --> up_addrenv_kmap_init
click arm64_pgvaddr href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/pgalloc.h#L75" "arch/arm64/src/common/pgalloc.h " _blank
up_addrenv_kmap_init --> mmu_ln_getentry
click up_addrenv_kmap_init href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_addrenv_pgmap.c#L212" "arch/arm64/src/common/arm64_addrenv_pgmap.c " _blank
mmu_ln_getentry --> up_invalidate_dcache
click mmu_ln_getentry href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L743" "arch/arm64/src/common/arm64_mmu.c " _blank
up_invalidate_dcache --> arm64_dcache_range
click up_invalidate_dcache href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_cache.c#L509" "arch/arm64/src/common/arm64_cache.c " _blank
arm64_dcache_range --> up_get_dcache_linesize
click arm64_dcache_range href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_cache.c#L154" "arch/arm64/src/common/arm64_cache.c " _blank
up_get_dcache_linesize --> arm64_cache_get_info
click up_get_dcache_linesize href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_cache.c#L552" "arch/arm64/src/common/arm64_cache.c " _blank
arm64_cache_get_info --> up_get_dcache_linesize
click arm64_cache_get_info href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_cache.c#L115" "arch/arm64/src/common/arm64_cache.c " _blank
up_get_dcache_linesize --> arm64_dcache_range
click up_get_dcache_linesize href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_cache.c#L554" "arch/arm64/src/common/arm64_cache.c " _blank
arm64_dcache_range --> mmu_ln_getentry
click arm64_dcache_range href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_cache.c#L161" "arch/arm64/src/common/arm64_cache.c " _blank
mmu_ln_getentry --> mmu_pte_to_paddr
click mmu_ln_getentry href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L758" "arch/arm64/src/common/arm64_mmu.c " _blank
mmu_pte_to_paddr --> up_addrenv_kmap_init
click mmu_pte_to_paddr href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.h#L515" "arch/arm64/src/common/arm64_mmu.h " _blank
up_addrenv_kmap_init --> arm64_pgvaddr
click up_addrenv_kmap_init href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_addrenv_pgmap.c#L206" "arch/arm64/src/common/arm64_addrenv_pgmap.c " _blank
arm64_pgvaddr --> up_addrenv_kmap_init
click arm64_pgvaddr href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/pgalloc.h#L75" "arch/arm64/src/common/pgalloc.h " _blank
up_addrenv_kmap_init --> mmu_ln_getentry
click up_addrenv_kmap_init href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_addrenv_pgmap.c#L212" "arch/arm64/src/common/arm64_addrenv_pgmap.c " _blank
mmu_ln_getentry --> up_invalidate_dcache
click mmu_ln_getentry href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L743" "arch/arm64/src/common/arm64_mmu.c " _blank
up_invalidate_dcache --> arm64_dcache_range
click up_invalidate_dcache href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_cache.c#L509" "arch/arm64/src/common/arm64_cache.c " _blank
arm64_dcache_range --> up_get_dcache_linesize
click arm64_dcache_range href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_cache.c#L154" "arch/arm64/src/common/arm64_cache.c " _blank
up_get_dcache_linesize --> arm64_dcache_range
click up_get_dcache_linesize href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_cache.c#L552" "arch/arm64/src/common/arm64_cache.c " _blank
arm64_dcache_range --> mmu_ln_getentry
click arm64_dcache_range href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_cache.c#L161" "arch/arm64/src/common/arm64_cache.c " _blank
mmu_ln_getentry --> mmu_pte_to_paddr
click mmu_ln_getentry href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.c#L758" "arch/arm64/src/common/arm64_mmu.c " _blank
mmu_pte_to_paddr --> up_addrenv_kmap_init
click mmu_pte_to_paddr href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.h#L515" "arch/arm64/src/common/arm64_mmu.h " _blank
up_addrenv_kmap_init --> mmu_ttbr_reg
click up_addrenv_kmap_init href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_addrenv_pgmap.c#L206" "arch/arm64/src/common/arm64_addrenv_pgmap.c " _blank
mmu_ttbr_reg --> kmm_map_initialize
click mmu_ttbr_reg href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_mmu.h#L391" "arch/arm64/src/common/arm64_mmu.h " _blank
kmm_map_initialize --> gran_initialize
click kmm_map_initialize href "https://github.com/apache/nuttx/blob/master/mm/kmap/kmm_map.c#L286" "mm/kmap/kmm_map.c " _blank
gran_initialize --> kmm_zalloc
click gran_initialize href "https://github.com/apache/nuttx/blob/master/mm/mm_gran/mm_graninit.c#L97" "mm/mm_gran/mm_graninit.c " _blank
kmm_zalloc --> mm_zalloc
click kmm_zalloc href "https://github.com/apache/nuttx/blob/master/mm/kmm_heap/kmm_zalloc.c#L52" "mm/kmm_heap/kmm_zalloc.c " _blank
mm_zalloc --> mm_malloc
click mm_zalloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_zalloc.c#L45" "mm/mm_heap/mm_zalloc.c " _blank
mm_malloc --> free_delaylist
click mm_malloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L170" "mm/mm_heap/mm_malloc.c " _blank
free_delaylist --> up_irq_save
click free_delaylist href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L58" "mm/mm_heap/mm_malloc.c " _blank
up_irq_save --> mm_lock_irq
click up_irq_save href "https://github.com/apache/nuttx/blob/master/arch/arm64/include/irq.h#L349" "arch/arm64/include/irq.h " _blank
mm_lock_irq --> free_delaylist
click mm_lock_irq href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L132" "mm/mm_heap/mm_lock.c " _blank
free_delaylist --> up_irq_restore
click free_delaylist href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L85" "mm/mm_heap/mm_malloc.c " _blank
up_irq_restore --> mm_unlock_irq
click up_irq_restore href "https://github.com/apache/nuttx/blob/master/arch/arm64/include/irq.h#L382" "arch/arm64/include/irq.h " _blank
mm_unlock_irq --> free_delaylist
click mm_unlock_irq href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_lock.c#L146" "mm/mm_heap/mm_lock.c " _blank
mm_malloc --> mm_lock
click mm_malloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L197" "mm/mm_heap/mm_malloc.c " _blank
nxsched_gettid --> mm_lock
click nxsched_gettid href "https://github.com/apache/nuttx/blob/master/sched/task/task_gettid.c#L68" "sched/task/task_gettid.c " _blank
nxmutex_lock --> nxsem_wait
click nxmutex_lock href "https://github.com/apache/nuttx/blob/master/libs/libc/misc/lib_mutex.c#L251" "libs/libc/misc/lib_mutex.c " _blank
mm_malloc --> mm_size2ndx
click mm_malloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L214" "mm/mm_heap/mm_malloc.c " _blank
mm_malloc --> mm_addfreechunk
click mm_malloc href "https://github.com/apache/nuttx/blob/master/mm/mm_heap/mm_malloc.c#L227" "mm/mm_heap/mm_malloc.c " _blank

NuttX Boot Flow in PDF / SVG / PNG

Unicorn Emulator for Apache NuttX RTOS on Avaota-A1 Arm64 SBC

Read the articles...

Previously...

Unicorn Exception at NuttX SysCall

While booting NuttX on Unicorn: NuttX triggers an Arm64 Exception is stuck at sys_call0. Is syscall supported in Unicorn?

$ cargo run
...
hook_block:  address=0x40806d4c, size=04, sched_unlock, sched/sched/sched_unlock.c:90:18
call_graph:  nxsched_merge_pending --> sched_unlock
call_graph:  click nxsched_merge_pending href "https://github.com/apache/nuttx/blob/master/sched/sched/sched_mergepending.c#L84" "sched/sched/sched_mergepending.c " _blank
hook_block:  address=0x40806d50, size=08, sched_unlock, sched/sched/sched_unlock.c:92:19
hook_block:  address=0x40806d58, size=08, sys_call0, arch/arm64/include/syscall.h:152:21
call_graph:  sched_unlock --> sys_call0
call_graph:  click sched_unlock href "https://github.com/apache/nuttx/blob/master/sched/sched/sched_unlock.c#L89" "sched/sched/sched_unlock.c " _blank
>> exception index = 2
AAAAAAAAAAAA
>>> invalid memory accessed, STOP = 21!!!
err=Err(EXCEPTION)
PC=0x40806d60
WARNING: Your register accessing on id 290 is deprecated and will get UC_ERR_ARG in the future release (2.2.0) because the accessing is either no-op or not defined. If you believe the register should be implemented or there is a bug, please submit an issue to https://github.com/unicorn-engine/unicorn. Set UC_IGNORE_REG_BREAK=1 to ignore this warning.
CP_REG=Ok(0)
ESR_EL0=Ok(0)
ESR_EL1=Ok(0)
ESR_EL2=Ok(0)
ESR_EL3=Ok(0)
call_graph:  sys_call0 --> ***_HALT_***
call_graph:  click sys_call0 href "https://github.com/apache/nuttx/blob/master/arch/arm64/include/syscall.h#L151" "arch/arm64/include/syscall.h " _blank

PC 0x40806d60 points to Arm64 SysCall svc 0: nuttx.S

sys_call0():
/Users/luppy/avaota/nuttx/include/arch/syscall.h:152
/* SVC with SYS_ call number and no parameters */
static inline uintptr_t sys_call0(unsigned int nbr)
{
  register uint64_t reg0 __asm__("x0") = (uint64_t)(nbr);
    40806d58:	d2800040 	mov	x0, #0x2                   	// #2
/Users/luppy/avaota/nuttx/include/arch/syscall.h:154
  __asm__ __volatile__
    40806d5c:	d4000001 	svc	#0x0
// 0x40806d60 is the next instruction to be executed on return from SysCall

Unicorn reports the exception as...

  • syndrome=0x86000006
  • fsr=0x206
  • vaddress=0x507fffff

Based on ESR-EL1 Doc...

  • Syndrome / FSR = 6 = 0b000110
  • Meaning "Translation fault, level 2"
  • But why halt at sys_call0?
  • NuttX seems to be triggering the SysCall for Initial Context Switch, according to the Call Graph

Unicorn prints invalid memory accessed, STOP = 21!!!

  • 21 means UC_ERR_EXCEPTION

Unicorn Exception is triggered here: unicorn-engine-2.1.3/qemu/accel/tcg/cpu-exec.c

static inline bool cpu_handle_exception(CPUState *cpu, int *ret) {
  ...
  // Unicorn: call registered interrupt callbacks
  catched = false;
  HOOK_FOREACH_VAR_DECLARE;
  HOOK_FOREACH(uc, hook, UC_HOOK_INTR) {
      if (hook->to_delete) {
          continue;
      }
      JIT_CALLBACK_GUARD(((uc_cb_hookintr_t)hook->callback)(uc, cpu->exception_index, hook->user_data));
      catched = true;
  }
  // Unicorn: If un-catched interrupt, stop executions.
  if (!catched) {
      printf("AAAAAAAAAAAA\n"); // qq
      if (uc->invalid_error == UC_ERR_OK) {
          //// EXCEPTION HAPPENS HERE
          uc->invalid_error = UC_ERR_EXCEPTION;
      }
      cpu->halted = 1;
      *ret = EXCP_HLT;
      return true;
  }

The above is more complex than Original QEMU: accel/tcg/cpu-exec.c

Is Unicorn expecting us to Hook this Interrupt and handle it?

Handle NuttX SysCall in Unicorn

Unicorn expects us to handle the NuttX SysCall. So we hook the SysCall Interrupt: src/main.rs

fn main() {
    ...
    // Add Interrupt Hook
    let _ = emu.add_intr_hook(hook_interrupt).unwrap();

    // Emulate Arm64 Machine Code
    let err = emu.emu_start(
        ADDRESS,  // Begin Address
        ADDRESS + KERNEL_SIZE as u64,  // End Address
        0,  // No Timeout
        0   // Unlimited number of instructions
    );
    ...
}

/// Hook Function to Handle Interrupt
fn hook_interrupt(
    emu: &mut Unicorn<()>,  // Emulator
    intno: u32, // Interrupt Number
) {
    println!("hook_interrupt: intno={intno}");
}

And it works!

$ cargo run
...
hook_block:  address=0x40806d50, size=08, sched_unlock, sched/sched/sched_unlock.c:92:19
hook_block:  address=0x40806d58, size=08, sys_call0, arch/arm64/include/syscall.h:152:21
call_graph:  sched_unlock --> sys_call0
call_graph:  click sched_unlock href "https://github.com/apache/nuttx/blob/master/sched/sched/sched_unlock.c#L89" "sched/sched/sched_unlock.c " _blank
>> exception index = 2
hook_interrupt: intno=2
PC=0x40806d60
WARNING: Your register accessing on id 290 is deprecated and will get UC_ERR_ARG in the future release (2.2.0) because the accessing is either no-op or not defined. If you believe the register should be implemented or there is a bug, please submit an issue to https://github.com/unicorn-engine/unicorn. Set UC_IGNORE_REG_BREAK=1 to ignore this warning.
CP_REG=Ok(0)
ESR_EL0=Ok(0)
ESR_EL1=Ok(0)
ESR_EL2=Ok(0)
ESR_EL3=Ok(0)
hook_block:  address=0x40806d60, size=16, sched_unlock, sched/sched/sched_unlock.c:104:28
call_graph:  sys_call0 --> sched_unlock
call_graph:  click sys_call0 href "https://github.com/apache/nuttx/blob/master/arch/arm64/include/syscall.h#L151" "arch/arm64/include/syscall.h " _blank
hook_block:  address=0x40806d90, size=04, up_irq_restore, arch/arm64/include/irq.h:383:3
hook_block:  address=0x40806d94, size=12, sched_unlock, sched/sched/sched_unlock.c:168:1

What happens if we resume the emulator?

It seems to continue running but it stops later...

call_graph:  up_irq_restore --> sched_unlock
call_graph:  click up_irq_restore href "https://github.com/apache/nuttx/blob/master/arch/arm64/include/irq.h#L382" "arch/arm64/include/irq.h " _blank
hook_block:  address=0x408062b4, size=04, nx_start, sched/init/nx_start.c:782:7
hook_block:  address=0x408169c8, size=08, up_idle, arch/arm64/src/common/arm64_idle.c:62:3
call_graph:  nx_start --> up_idle
call_graph:  click nx_start href "https://github.com/apache/nuttx/blob/master/sched/init/nx_start.c#L781" "sched/init/nx_start.c " _blank
>> exception index = 65537
>>> stop with r = 10001, HLT=10001
>>> got HLT!!!
err=Ok(())
PC=0x408169d0
WARNING: Your register accessing on id 290 is deprecated and will get UC_ERR_ARG in the future release (2.2.0) because the accessing is either no-op or not defined. If you believe the register should be implemented or there is a bug, please submit an issue to https://github.com/unicorn-engine/unicorn. Set UC_IGNORE_REG_BREAK=1 to ignore this warning.
CP_REG=Ok(0)
ESR_EL0=Ok(0)
ESR_EL1=Ok(0)
ESR_EL2=Ok(0)
ESR_EL3=Ok(0)
call_graph:  up_idle --> ***_HALT_***
call_graph:  click up_idle href "https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_idle.c#L61" "arch/arm64/src/common/arm64_idle.c " _blank

PC 0x408169d0 points to WFI: nuttx/nuttx.S

00000000408169c8 <up_idle>:
up_idle():
/Users/luppy/avaota/nuttx/arch/arm64/src/common/arm64_idle.c:62
  nxsched_process_timer();
#else
  /* Sleep until an interrupt occurs to save power */
  asm("dsb sy");
    408169c8:	d5033f9f 	dsb	sy
/Users/luppy/avaota/nuttx/arch/arm64/src/common/arm64_idle.c:63
  asm("wfi");
    408169cc:	d503207f 	wfi
/Users/luppy/avaota/nuttx/arch/arm64/src/common/arm64_idle.c:65
#endif
}
// 408169d0 is the next instruction after WFI

NuttX Scheduler seems to be waiting for us to handle the SysCall, to continue booting.

NuttX SysCall

What's NuttX SysCall 0?

Look for the SysCall in the list below, it includes plenty of Scheduler Functions...

https://github.com/apache/nuttx/blob/master/include/sys/syscall_lookup.h

SYSCALL_LOOKUP(getpid,                     0)
SYSCALL_LOOKUP(gettid,                     0)
SYSCALL_LOOKUP(sched_getcpu,               0)
SYSCALL_LOOKUP(sched_lock,                 0)
SYSCALL_LOOKUP(sched_lockcount,            0)
SYSCALL_LOOKUP(sched_unlock,               0)
SYSCALL_LOOKUP(sched_yield,                0)

Our X0 Parameter to SysCall is 2...

/Users/luppy/avaota/nuttx/sched/sched/sched_unlock.c:92
                {
                  up_switch_context(this_task(), rtcb);
    40807230:	d538d080 	mrs	x0, tpidr_el1
    40807234:	37000060 	tbnz	w0, #0, 40807240 <sched_unlock+0x80>
sys_call0():
/Users/luppy/avaota/nuttx/include/arch/syscall.h:152
/* SVC with SYS_ call number and no parameters */
static inline uintptr_t sys_call0(unsigned int nbr)
{
  register uint64_t reg0 __asm__("x0") = (uint64_t)(nbr);
    40807238:	d2800040 	mov	x0, #0x2                   	// #2
/Users/luppy/avaota/nuttx/include/arch/syscall.h:154
  __asm__ __volatile__
    4080723c:	d4000001 	svc	#0x0

Which means Switch Context...

https://github.com/apache/nuttx/blob/master/arch/arm64/include/syscall.h#L78-L83

/* SYS call 2:
 * void arm64_switchcontext(void **saveregs, void *restoreregs);
 */
#define SYS_switch_context        (2)

Which is implemented here...

https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_syscall.c#L201-L216

uint64_t *arm64_syscall(uint64_t *regs) {
  ...
      case SYS_switch_context:

        /* Update scheduler parameters */

        nxsched_suspend_scheduler(*running_task);
        nxsched_resume_scheduler(tcb);
        *running_task = tcb;

        /* Restore the cpu lock */

        restore_critical_section(tcb, cpu);
#ifdef CONFIG_ARCH_ADDRENV
        addrenv_switch(tcb);
#endif
        break;

Who calls arm64_syscall? It's called by arm64_sync_exc to handle Synchronous Exception for AArch64:

https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_vectors.S#L195

Who calls arm64_sync_exc? It's called by the Vector Table for:

  • Synchronous Exception from same exception level, when using the SP_EL0 stack pointer
  • Synchronous Exception from same exception level, when using the SP_ELx stack pointer (we're using EL1)

https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_vector_table.S#L158

Arm64 Vector Table

Let's read VBAR_EL1 to fetch Vector Table. Then trigger SVC 0 at EL1...

https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_vector_table.S#L103-L145

/* Four types of exceptions:
 * - synchronous: aborts from MMU, SP/CP alignment checking, unallocated
 *   instructions, SVCs/SMCs/HVCs, ...)
 * - IRQ: group 1 (normal) interrupts
 * - FIQ: group 0 or secure interrupts
 * - SError: fatal system errors
 *
 * Four different contexts:
 * - from same exception level, when using the SP_EL0 stack pointer
 * - from same exception level, when using the SP_ELx stack pointer
 * - from lower exception level, when this is AArch64
 * - from lower exception level, when this is AArch32
 *
 * +------------------+------------------+-------------------------+
 * |     Address      |  Exception type  |       Description       |
 * +------------------+------------------+-------------------------+
 * | VBAR_ELn + 0x000 | Synchronous      | Current EL with SP0     |
 * |          + 0x080 | IRQ / vIRQ       |                         |
 * |          + 0x100 | FIQ / vFIQ       |                         |
 * |          + 0x180 | SError / vSError |                         |
 * +------------------+------------------+-------------------------+
 * |          + 0x200 | Synchronous      | Current EL with SPx     |
 * |          + 0x280 | IRQ / vIRQ       |                         |
 * |          + 0x300 | FIQ / vFIQ       |                         |
 * |          + 0x380 | SError / vSError |                         |
 * +------------------+------------------+-------------------------+
 * |          + 0x400 | Synchronous      | Lower EL using AArch64  |
 * |          + 0x480 | IRQ / vIRQ       |                         |
 * |          + 0x500 | FIQ / vFIQ       |                         |
 * |          + 0x580 | SError / vSError |                         |
 * +------------------+------------------+-------------------------+
 * |          + 0x600 | Synchronous      | Lower EL using AArch32  |
 * |          + 0x680 | IRQ / vIRQ       |                         |
 * |          + 0x700 | FIQ / vFIQ       |                         |
 * |          + 0x780 | SError / vSError |                         |
 * +------------------+------------------+-------------------------+

We are doing SVC (Synchronous Exception) at EL1. Which means Unicorn Emulator should jump to VBAR_EL1 + 0x200.

Jump to SysCall 0

This is how we jump to VBAR_EL1 + 0x200: src/main.rs

/// Hook Function to Handle Interrupt
fn hook_interrupt(
    emu: &mut Unicorn<()>,  // Emulator
    intno: u32, // Interrupt Number
) {
    println!("hook_interrupt: intno={intno}");
    println!("PC=0x{:x}",  emu.reg_read(RegisterARM64::PC).unwrap());
    // println!("CP_REG={:?}",  emu.reg_read(RegisterARM64::CP_REG));
    println!("ESR_EL0={:?}", emu.reg_read(RegisterARM64::ESR_EL0));
    println!("ESR_EL1={:?}", emu.reg_read(RegisterARM64::ESR_EL1));
    println!("ESR_EL2={:?}", emu.reg_read(RegisterARM64::ESR_EL2));
    println!("ESR_EL3={:?}", emu.reg_read(RegisterARM64::ESR_EL3));

    // We are doing SVC (Synchronous Exception) at EL1.
    // Which means Unicorn Emulator should jump to VBAR_EL1 + 0x200.
    let vbar_el1 = emu.reg_read(RegisterARM64::VBAR_EL1).unwrap();
    let svc = vbar_el1 + 0x200;
    println!("vbar_el1=0x{vbar_el1:08x}");
    println!("jump to svc=0x{svc:08x}");
    emu.reg_write(RegisterARM64::PC, svc).unwrap();
}

And it crashes...

- Ready to Boot Primary CPU
- Boot from EL1
- Boot to C runtime for OS Initialize
\rnx_start: Entry
up_allocate_kheap: heap_start=0x0x40849000, heap_size=0x77b7000
gic_validate_dist_version: No GIC version detect
arm64_gic_initialize: no distributor detected, giving up ret=-19
uart_register: Registering /dev/console
uart_register: Registering /dev/ttyS0
work_start_highpri: Starting high-priority kernel worker thread(s)
nxtask_activate: hpwork pid=1,TCB=0x40849e78
work_start_lowpri: Starting low-priority kernel worker thread(s)
nxtask_activate: lpwork pid=2,TCB=0x4084c008
nxtask_activate: AppBringUp pid=3,TCB=0x4084c190

vbar_el1=0x40827000
jump to svc=0x40827200

arm64_el1_undef: Undefined instruction at 0x0, dump:
dump_assert_info: Current Version: NuttX  12.8.0 c9f38c13eb Apr  5 2025 09:08:34 arm64
dump_assert_info: Assertion failed !(({ uint64_t __val; __asm__ volatile ("mrs %0, " "tpidr_el1" : "=r" (__val) :: "memory"); __val; }) & 1): at file: common/arm64_fatal.c:558 task: Idle_Task process: Kernel 0x40806568
up_dump_register: stack = 0x408440a0
up_dump_register: x0:   0x408440a0          x1:   0x408443e0
up_dump_register: x2:   0x1                 x3:   0x1
up_dump_register: x4:   0x4                 x5:   0x40801000
up_dump_register: x6:   0x0                 x7:   0x0
up_dump_register: x8:   0x80000000008000    x9:   0x0
up_dump_register: x10:  0x0                 x11:  0x0
up_dump_register: x12:  0x101010101010101   x13:  0x8
up_dump_register: x14:  0xffffffffffffffe   x15:  0x0
up_dump_register: x16:  0x4080d884          x17:  0x0
up_dump_register: x18:  0x0                 x19:  0x40843048
up_dump_register: x20:  0x408282ec          x21:  0x40828356
up_dump_register: x22:  0x408440a0          x23:  0x408440a0
up_dump_register: x24:  0x40843000          x25:  0x2c0
up_dump_register: x26:  0x6                 x27:  0x22e
up_dump_register: x28:  0x0                 x29:  0x0
up_dump_register: x30:  0x40806ce8        
up_dump_register: 
up_dump_register: STATUS Registers:
up_dump_register: SPSR:      0x0               
up_dump_register: ELR:       0x0               
up_dump_register: SP_EL0:    0x0               
up_dump_register: SP_ELX:    0x40847ea0        
up_dump_register: EXE_DEPTH: 0x0               
up_dump_register: SCTLR_EL1: 0x30d0180d        
dump_tasks:    PID GROUP PRI POLICY   TYPE    NPX STATE   EVENT      SIGMASK          STACKBASE  STACKSIZE      USED   FILLED    COMMAND
dump_tasks:   ----   --- --- -------- ------- --- ------- ---------- ---------------- 0x40845760      4096         0     0.0%    irq
dump_task:       0     0   0 FIFO     Kthread -   Ready              0000000000000000 0x40846770      8176      3088    37.7%    Idle_Task
dump_task:       1     0 192 RR       Kthread -   Ready              0000000000000000 0x4084a050      8112       832    10.2%    hpwork 0x40836568 0x408365b8
dump_task:       2     0 100 RR       Kthread -   Ready              0000000000000000 0x4084e050      8112       832    10.2%    lpwork 0x408364e8 0x40836538
dump_task:       3     0 240 RR       Kthread -   Running            0000000000000000 0x40852030      8144       832    10.2%    AppBringUp

ESR_EL1 is missing

Why did it fail? Who's calling arm64_fatal_handler?

We inspect the Arm64 Exception Handler in NuttX...

https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_vectors.S#L134-L203

/****************************************************************************
 * Function: arm64_sync_exc
 *
 * Description:
 *   handle synchronous exception for AArch64
 *
 ****************************************************************************/

GTEXT(arm64_sync_exc)
SECTION_FUNC(text, arm64_sync_exc)
    /* checking the EC value to see which exception need to be handle */

#if CONFIG_ARCH_ARM64_EXCEPTION_LEVEL == 3
    mrs    x9, esr_el3
#else
    mrs    x9, esr_el1
#endif
    lsr    x10, x9, #26

    /* 0x15 = SVC system call */

    cmp    x10, #0x15

    /* if this is a svc call ?*/

    bne    2f

#ifdef CONFIG_LIB_SYSCALL
    /* Handle user system calls separately */

    cmp    x0, #CONFIG_SYS_RESERVED
    blt    reserved_syscall

    /* Call dispatch_syscall() on the kernel stack with interrupts enabled */

    mrs    x10, spsr_el1
    and    x10, x10, #IRQ_SPSR_MASK
    cmp    x10, xzr
    bne    1f
    msr    daifclr, #IRQ_DAIF_MASK /* Re-enable interrupts */

1:
    bl     dispatch_syscall
    msr    daifset, #IRQ_DAIF_MASK /* Disable interrupts */

    /* Save the return value into the user context */

    str    x0, [sp, #8 * REG_X0]

    /* Return from exception */

    b      arm64_exit_exception

reserved_syscall:
#endif

    /* Switch to IRQ stack and save current sp on it. */
#ifdef CONFIG_SMP
    get_cpu_id x0
    ldr    x1, =(g_cpu_int_stacktop)
    lsl    x0, x0, #3
    ldr    x1, [x1, x0]
#else
    ldr    x1, =(g_interrupt_stack + CONFIG_ARCH_INTERRUPTSTACK)
#endif

    mov    x0, sp
    mov    sp, x1

    bl     arm64_syscall        /* Call the handler */

    mov    sp, x0
    b      arm64_exit_exception
2:
    mov    x0, sp
    adrp   x5, arm64_fatal_handler
    add    x5, x5, #:lo12:arm64_fatal_handler
    br     x5

Aha ESR_EL1 is missing! That's why it's calling arm64_fatal_handler!

Fix ESR_EL1

We fix ESR_EL1: src/main.rs

let esr_el1 = 0x15 << 26;  // Exception is SVC
let vbar_el1 = emu.reg_read(RegisterARM64::VBAR_EL1).unwrap();
let svc = vbar_el1 + 0x200;
println!("esr_el1=0x{esr_el1:08x}");
println!("vbar_el1=0x{vbar_el1:08x}");
println!("jump to svc=0x{svc:08x}");
emu.reg_write(RegisterARM64::ESR_EL1, esr_el1).unwrap();
emu.reg_write(RegisterARM64::PC, svc).unwrap();

NuttX on Unicorn now boots to NSH Shell. Yay!

- Ready to Boot Primary CPU
- Boot from EL1
- Boot to C runtime for OS Initialize
\rnx_start: Entry
up_allocate_kheap: heap_start=0x0x40849000, heap_size=0x77b7000
gic_validate_dist_version: No GIC version detect
arm64_gic_initialize: no distributor detected, giving up ret=-19
uart_register: Registering /dev/console
uart_register: Registering /dev/ttyS0
work_start_highpri: Starting high-priority kernel worker thread(s)
nxtask_activate: hpwork pid=1,TCB=0x40849e78
work_start_lowpri: Starting low-priority kernel worker thread(s)
nxtask_activate: lpwork pid=2,TCB=0x4084c008
nxtask_activate: AppBringUp pid=3,TCB=0x4084c190
>> exception index = 2
hook_interrupt: intno=2
PC=0x40807300
X0=0x00000002
ESR_EL0=Ok(0)
ESR_EL1=Ok(0)
ESR_EL2=Ok(0)
ESR_EL3=Ok(0)
esr_el1=0x54000000
vbar_el1=0x40827000
jump to svc=0x40827200
>> exception index = 65536
>>> stop with r = 10000, HLT=10001
>> exception index = 4294967295

arm64_dump_syscall: SYSCALL arm64_syscall: regs: 0x408483c0 cmd: 2
arm64_dump_syscall: x0:  0x2                 x1:  0x0
arm64_dump_syscall: x2:  0x4084c008          x3:  0x408432b8
arm64_dump_syscall: x4:  0x40849e78          x5:  0x2
arm64_dump_syscall: x6:  0x40843000          x7:  0x3

nx_start_application: Starting init task: /system/bin/init
nxtask_activate: /system/bin/init pid=4,TCB=0x4084c9f0
nxtask_exit: AppBringUp pid=3,TCB=0x4084c190

>> exception index = 2
hook_interrupt: intno=2
PC=0x40816be8
X0=0x00000001
ESR_EL0=Ok(0)
ESR_EL1=Ok(1409286144)
ESR_EL2=Ok(0)
ESR_EL3=Ok(0)
esr_el1=0x54000000
vbar_el1=0x40827000
jump to svc=0x40827200
>> exception index = 65536
>>> stop with r = 10000, HLT=10001
>> exception index = 4294967295

arm64_dump_syscall: SYSCALL arm64_syscall: regs: 0x40853c70 cmd: 1
arm64_dump_syscall: x0:  0x1                 x1:  0x40843000
arm64_dump_syscall: x2:  0x0                 x3:  0x1
arm64_dump_syscall: x4:  0x3                 x5:  0x40844000
arm64_dump_syscall: x6:  0x4                 x7:  0x0

>> exception index = 2
hook_interrupt: intno=2
PC=0x4080b35c
X0=0x00000002
ESR_EL0=Ok(0)
ESR_EL1=Ok(1409286144)
ESR_EL2=Ok(0)
ESR_EL3=Ok(0)
esr_el1=0x54000000
vbar_el1=0x40827000
jump to svc=0x40827200
>> exception index = 65536
>>> stop with r = 10000, HLT=10001
>> exception index = 4294967295

arm64_dump_syscall: SYSCALL arm64_syscall: regs: 0x4084bc20 cmd: 2
arm64_dump_syscall: x0:  0x2                 x1:  0xc0
arm64_dump_syscall: x2:  0x4084c008          x3:  0x0
arm64_dump_syscall: x4:  0x408432d0          x5:  0x0
arm64_dump_syscall: x6:  0x0                 x7:  0x0

>> exception index = 2
hook_interrupt: intno=2
PC=0x4080b35c
X0=0x00000002
ESR_EL0=Ok(0)
ESR_EL1=Ok(1409286144)
ESR_EL2=Ok(0)
ESR_EL3=Ok(0)
esr_el1=0x54000000
vbar_el1=0x40827000
jump to svc=0x40827200
>> exception index = 65536
>>> stop with r = 10000, HLT=10001
>> exception index = 4294967295

arm64_dump_syscall: SYSCALL arm64_syscall: regs: 0x4084fc20 cmd: 2
arm64_dump_syscall: x0:  0x2                 x1:  0x64
arm64_dump_syscall: x2:  0x4084c9f0          x3:  0x0
arm64_dump_syscall: x4:  0x408432d0          x5:  0x0
arm64_dump_syscall: x6:  0x0                 x7:  0x0

>> exception index = 2
hook_interrupt: intno=2
PC=0xc0003f00
X0=0x00000009
ESR_EL0=Ok(0)
ESR_EL1=Ok(1409286144)
ESR_EL2=Ok(0)
ESR_EL3=Ok(0)
TODO: Handle SysCall from NuttX Apps

SysCall from NuttX App

What is SysCall Command 9? Where in NSH Shell is 0xc0003f00?

It's from NSH Shell gettid: nuttx/nuttx-init.S

0000000000002ef4 <gettid>:
gettid():
    2ef4:	d2800120 	mov	x0, #0x9                   	// #9
    2ef8:	f81f0ffe 	str	x30, [sp, #-16]!
    2efc:	d4000001 	svc	#0x0
    2f00:	f84107fe 	ldr	x30, [sp], #16
    2f04:	d65f03c0 	ret

Up Next: We implement SysCalls for NuttX Apps at EL0.

TODO

TODO: Who calls gettid?

TODO: Renegerate nuttx-init.S with Debug Symbols

TODO: GICv3 won't work in Unicorn, so we have to simulate Timer Interrupts and I/O Interrupts

TODO: Emulate the GIC Version, to make NuttX happy

$ cargo run | grep "uart output"
- Ready to Boot Primary CPU
- Boot from EL1
- Boot to C runtime for OS Initialize
nx_start: Entry
up_allocate_kheap: heap_start=0x0x40849000, heap_size=0x77b7000
gic_validate_dist_version: No GIC version detect
arm64_gic_initialize: no distributor detected, giving up ret=-19
uart_register: Registering /dev/console
uart_register: Registering /dev/ttyS0
work_start_highpri: Starting high-priority kernel worker thread(s)
nxtask_activate: hpwork pid=1,TCB=0x40849e78
work_start_lowpri: Starting low-priority kernel worker thread(s)
nxtask_activate: lpwork pid=2,TCB=0x4084c008
nxtask_activate: AppBringUp pid=3,TCB=0x4084c190
nx_start: CPU0: Beginning Idle Loop

TODO: up_enable_irq calls arm64_gic_irq_enable. So we should emulate GICv3:

arch/arm64/src/common/arm64_gicv3.c:683

void up_enable_irq(int irq) {
  arm64_gic_irq_enable(irq);
  ...

TODO: Simulate the Arm64 Timer Interrupt: https://lupyuen.org/articles/interrupt.html#timer-interrupt-isnt-handled

TODO: Read VBAR_EL1 to fetch Vector Table. Then trigger Timer Interrupt

TODO: Why is Interrupt Number intno=2?

Page C6-2411
SVC
Supervisor call
This instruction causes an exception to be taken to EL1.
On executing an SVC instruction, the PE records the exception as a Supervisor Call exception in ESR_ELx, using the EC
value 0x15, and the value of the immediate argument.

do_arm_semihosting

vbar_el1 = 1082290176

Unicorn Emulator for Avaota-A1 SBC