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https://github.com/trezor/trezor-firmware.git
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78 lines
2.2 KiB
ArmAsm
78 lines
2.2 KiB
ArmAsm
.syntax unified
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.text
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.global reset_handler
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.type reset_handler, STT_FUNC
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reset_handler:
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// set the stack protection
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ldr r0, =_sstack
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add r0, r0, #16 // padding
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msr MSPLIM, r0
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// setup environment for subsequent stage of code
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ldr r2, =0 // r2 - the word-sized value to be written
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ldr r0, =sram1_start // r0 - point to beginning of SRAM
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ldr r1, =sram1_end // r1 - point to byte after the end of SRAM
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bl memset_reg
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ldr r0, =sram2_start // r0 - point to beginning of SRAM
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ldr r1, =sram2_end // r1 - point to byte after the end of SRAM
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bl memset_reg
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ldr r0, =sram4_start // r0 - point to beginning of SRAM
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ldr r1, =sram4_end // r1 - point to byte after the end of SRAM
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bl memset_reg
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ldr r0, =sram6_start // r0 - point to beginning of SRAM
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ldr r1, =sram6_end // r1 - point to byte after the end of SRAM
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bl memset_reg
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ldr r0, =sram3_start // r0 - point to beginning of SRAM
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ldr r1, =__fb_start // r1 - point to beginning of framebuffer
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bl memset_reg
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ldr r0, =__fb_end // r0 - point to end of framebuffer
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ldr r1, =sram5_end // r1 - point to byte after the end of SRAM
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bl memset_reg
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// copy data in from flash
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ldr r0, =data_vma // dst addr
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ldr r1, =data_lma // src addr
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ldr r2, =data_size // size in bytes
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bl memcpy
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// copy sensitive data in from flash
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ldr r0, =sensitive_vma // dst addr
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ldr r1, =sensitive_lma // src addr
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ldr r2, =sensitive_size // size in bytes
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bl memcpy
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// setup the stack protector (see build script "-fstack-protector-all") with an unpredictable value
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bl rng_get
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ldr r1, = __stack_chk_guard
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str r0, [r1]
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// copy & clear g_boot_command
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ldr r0, =g_boot_command
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ldr r1, [r0]
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ldr r0, =g_boot_command_shadow
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str r1, [r0]
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ldr r0, =g_boot_command
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mov r1, #0
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str r1, [r0]
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// re-enable exceptions
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// according to "ARM Cortex-M Programming Guide to Memory Barrier Instructions" Application Note 321, section 4.7:
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// "If it is not necessary to ensure that a pended interrupt is recognized immediately before
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// subsequent operations, it is not necessary to insert a memory barrier instruction."
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cpsie f
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// enter the application code
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bl main
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b shutdown_privileged
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.end
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