SashegDev
25 lines
687 B
ArmAsm
25 lines
687 B
ArmAsm
.syntax unified
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.cpu cortex-a7
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.thumb
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@ Banner stub for SBL1 logger call at 0x802f690 (patched to bl here).
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@ r0 = string. Print raw bytes via UARTDM until NUL (cap 256).
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@ The original callee is noreturn (b.n self follows the call), so
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@ jump on to 0x802f694 (post-banner init) instead of returning.
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.text
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.global banner_stub
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banner_stub:
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push {r4, lr}
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movw r3, #0xf000
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movt r3, #0x78a
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movs r1, #0x21 @ marker '!' proves stub ran
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str r1, [r3, #0x70]
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bn_loop:
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ldrb r1, [r0], #1
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cbz r1, bn_done
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str r1, [r3, #0x70]
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b bn_loop
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bn_done:
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movw lr, #:lower16:0x802f694
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movt lr, #:upper16:0x802f694
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bx lr
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