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56 lines
1.3 KiB
ArmAsm
56 lines
1.3 KiB
ArmAsm
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/* Helper function for the test case in test_context_save_clobber.c */
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#if defined(__XTENSA__)
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#include "xtensa/config/core-isa.h"
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#if defined(XCHAL_HAVE_WINDOWED)
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.data
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recursion_count:
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.word 0
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.text
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.global test_context_save_clober_func
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.type test_context_save_clober_func,@function
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.align 4
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/* This function recursively calls itself via call4, making sure each frame
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* uses only 4 registers. For this reason, recursion count can not be
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* a function argument (it would have to be in a6) and is placed into .data
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* section above.
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*/
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test_context_save_clober_func:
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entry a1, 16
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/* load recursion count from memory */
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movi a3, recursion_count
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l32i a2, a3, 0
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/* if it is zero, initialize it to 16 (=64 physical registers / 4 registers per call) */
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bnez a2, 1f
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movi a2, 16
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1:
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/* decrement the counter and write it back */
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addi a2, a2, -1
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s32i a2, a3, 0
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/* counter not zero? do a recursive call */
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beqz a2, wait
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call4 test_context_save_clober_func
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j end
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wait:
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/* Counter has reached zero, and we have 16 frames on the stack.
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* Delay for a few seconds, expecting in interrupt to happen.
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*/
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movi a3, 100000000
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1:
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addi a3, a3, -1
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bnez a3, 1b
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end:
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retw
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#endif // XCHAL_HAVE_WINDOWED
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#endif // __XTENSA__
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