SashegDev
23 lines
515 B
ArmAsm
23 lines
515 B
ArmAsm
.syntax unified
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.cpu cortex-a7
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.thumb
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@ maze entry logger: ring buffer of 8 (lr,sp) at MAILBOX, return 0.
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@ Preserves all regs except r0 (return value) and r12 (IP, clobber-ok).
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.text
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.global maze_stub
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maze_stub:
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push {r0-r3}
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movw r12, #:lower16:0x08006890
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movt r12, #:upper16:0x08006890
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ldr r0, [r12, #32]
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add r0, #1
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and r0, #7
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str r0, [r12, #32]
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lsl r0, #3
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add r0, r12
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str lr, [r0]
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str sp, [r0, #4]
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pop {r0-r3}
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movs r0, #0
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bx lr
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