kopia lustrzana https://github.com/espressif/esp-idf
52 wiersze
848 B
ArmAsm
52 wiersze
848 B
ArmAsm
/*
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This little bit of code is executed in-place by one CPU, but copied to a different memory region
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by the other CPU. Make sure it stays position-independent.
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*/
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.text
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.align 4
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.global test_s32c1i_lock
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.type test_s32c1i_lock,@function
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//Args:
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//a2 - lock addr
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//a3 - val to lock with
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//a4 - val to unlock with
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//a5 - addr to increase
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test_s32c1i_lock:
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entry a1, 64
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wsr a4, SCOMPARE1
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lockloop:
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mov a6, a3
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s32c1i a6, a2, 0
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bne a4, a6, lockloop
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l32i a6, a5, 0
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//Give other CPU the time to mess up the inc if the lock somehow malfunctions
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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addi a6, a6, 1
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s32i a6, a5, 0
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//No need to actually let this loop but hey, a hang indicates an error, right?
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wsr a3, SCOMPARE1
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unlockloop:
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mov a6, a4
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s32c1i a6, a2, 0
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bne a3, a6, unlockloop
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retw
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