kopia lustrzana https://github.com/micropython/micropython
104 wiersze
3.3 KiB
C
104 wiersze
3.3 KiB
C
![]() |
/*
|
||
|
* This file is part of the MicroPython project, http://micropython.org/
|
||
|
*
|
||
|
* The MIT License (MIT)
|
||
|
*
|
||
|
* Copyright (c) 2014-2017 Damien P. George
|
||
|
*
|
||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
* of this software and associated documentation files (the "Software"), to deal
|
||
|
* in the Software without restriction, including without limitation the rights
|
||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
* copies of the Software, and to permit persons to whom the Software is
|
||
|
* furnished to do so, subject to the following conditions:
|
||
|
*
|
||
|
* The above copyright notice and this permission notice shall be included in
|
||
|
* all copies or substantial portions of the Software.
|
||
|
*
|
||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||
|
* THE SOFTWARE.
|
||
|
*/
|
||
|
|
||
|
#include "py/mpstate.h"
|
||
|
#include "py/nlr.h"
|
||
|
|
||
|
#if !MICROPY_NLR_SETJMP && defined(__xtensa__)
|
||
|
|
||
|
#undef nlr_push
|
||
|
|
||
|
// Xtensa calling conventions:
|
||
|
// a0 = return address
|
||
|
// a1 = stack pointer
|
||
|
// a2 = first arg, return value
|
||
|
// a3-a7 = rest of args
|
||
|
|
||
|
unsigned int nlr_push(nlr_buf_t *nlr) {
|
||
|
|
||
|
__asm volatile (
|
||
|
"s32i.n a0, a2, 8 \n" // save regs...
|
||
|
"s32i.n a1, a2, 12 \n"
|
||
|
"s32i.n a8, a2, 16 \n"
|
||
|
"s32i.n a9, a2, 20 \n"
|
||
|
"s32i.n a10, a2, 24 \n"
|
||
|
"s32i.n a11, a2, 28 \n"
|
||
|
"s32i.n a12, a2, 32 \n"
|
||
|
"s32i.n a13, a2, 36 \n"
|
||
|
"s32i.n a14, a2, 40 \n"
|
||
|
"s32i.n a15, a2, 44 \n"
|
||
|
"j nlr_push_tail \n" // do the rest in C
|
||
|
);
|
||
|
|
||
|
return 0; // needed to silence compiler warning
|
||
|
}
|
||
|
|
||
|
__attribute__((used)) unsigned int nlr_push_tail(nlr_buf_t *nlr) {
|
||
|
nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
|
||
|
nlr->prev = *top;
|
||
|
*top = nlr;
|
||
|
return 0; // normal return
|
||
|
}
|
||
|
|
||
|
void nlr_pop(void) {
|
||
|
nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
|
||
|
*top = (*top)->prev;
|
||
|
}
|
||
|
|
||
|
NORETURN void nlr_jump(void *val) {
|
||
|
nlr_buf_t **top_ptr = &MP_STATE_THREAD(nlr_top);
|
||
|
nlr_buf_t *top = *top_ptr;
|
||
|
if (top == NULL) {
|
||
|
nlr_jump_fail(val);
|
||
|
}
|
||
|
|
||
|
top->ret_val = val;
|
||
|
*top_ptr = top->prev;
|
||
|
|
||
|
__asm volatile (
|
||
|
"mov.n a2, %0 \n" // a2 points to nlr_buf
|
||
|
"l32i.n a0, a2, 8 \n" // restore regs...
|
||
|
"l32i.n a1, a2, 12 \n"
|
||
|
"l32i.n a8, a2, 16 \n"
|
||
|
"l32i.n a9, a2, 20 \n"
|
||
|
"l32i.n a10, a2, 24 \n"
|
||
|
"l32i.n a11, a2, 28 \n"
|
||
|
"l32i.n a12, a2, 32 \n"
|
||
|
"l32i.n a13, a2, 36 \n"
|
||
|
"l32i.n a14, a2, 40 \n"
|
||
|
"l32i.n a15, a2, 44 \n"
|
||
|
"movi.n a2, 1 \n" // return 1, non-local return
|
||
|
"ret.n \n" // return
|
||
|
: // output operands
|
||
|
: "r"(top) // input operands
|
||
|
: // clobbered registers
|
||
|
);
|
||
|
|
||
|
for (;;); // needed to silence compiler warning
|
||
|
}
|
||
|
|
||
|
#endif // !MICROPY_NLR_SETJMP && defined(__xtensa__)
|