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warp7: panic: hab: Call into BootROM failsafe on panic path 

This patch adds a callback into the BootROM's provided High Assurance Boot
(HAB) failsafe function when panicking i.e. the call is done without making
use of stack.

The HAB failsafe function allows a piece of software to call into the
BootROM and place the processor into failsafe mode.

Failsafe mode is a special mode which presents a serial download protocol
interface over UART or USB at the time of writing.

If the board has been set into secure mode, then only a signed binary can
be used to recover the board.

Thus failsafe gives a putatively secure method of performing a secure
recovery over UART or USB.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Ryan Harkin <ryan.harkin@linaro.org>
This commit is contained in:
Bryan O'Donoghue 2018-07-04 13:16:35 +01:00
parent a22d06ce4a
commit 20c0eca0f2
1 changed files with 8 additions and 0 deletions
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8
plat/imx/imx7/warp7/aarch32/warp7_helpers.S
View File

@ -8,11 +8,13 @@
#include <asm_macros.S>
#include <assert_macros.S>
#include <platform_def.h>
#include <imx_hab.h>
.globl platform_mem_init
.globl plat_get_my_entrypoint
.globl plat_crash_console_init
.globl plat_crash_console_putc
.globl plat_panic_handler
/* ---------------------------------------------
* int plat_mem_init(void)
@ -42,3 +44,9 @@ func plat_crash_console_putc
mov_imm r1, PLAT_WARP7_BOOT_UART_BASE
b imx_crash_uart_putc
endfunc plat_crash_console_putc
func plat_panic_handler
mov r3, #HAB_ROM_VECTOR_TABLE_FAILSAFE
ldr r3, [r3, #0]
blx r3
endfunc plat_panic_handler