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