esp-idf/components/freertos/test/test_context_save_clobber.S

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