py/nlrxtensa: Convert from assembler to C file with inline asm.
nlr_jump is a little bit inefficient because it now saves a register to the stack.
This commit is contained in:
Damien George
parent
be3d7f91e5
commit
a85755aa22
119
py/nlrxtensa.S
119
py/nlrxtensa.S
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/*
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* This file is part of the Micro Python 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 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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#if defined(__xtensa__)
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/*
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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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*/
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// the offset of nlr_top within mp_state_ctx_t
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#define NLR_TOP_OFFSET (2 * 4)
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#define NLR_TOP (mp_state_ctx + NLR_TOP_OFFSET)
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.file "nlr.s"
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.text
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.literal_position
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.literal .LC0, NLR_TOP
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.align 4
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.global nlr_push
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.type nlr_push, @function
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nlr_push:
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// save regs
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s32i.n a0, a2, 8
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s32i.n a1, a2, 12
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s32i.n a8, a2, 16
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s32i.n a9, a2, 20
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s32i.n a10, a2, 24
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s32i.n a11, a2, 28
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s32i.n a12, a2, 32
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s32i.n a13, a2, 36
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s32i.n a14, a2, 40
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s32i.n a15, a2, 44
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l32r a3, .LC0
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l32i.n a4, a3, 0
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s32i.n a2, a3, 0
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s32i.n a4, a2, 0
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movi.n a2, 0
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ret.n
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.size nlr_push, .-nlr_push
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.literal_position
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.literal .LC1, NLR_TOP
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.align 4
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.global nlr_pop
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.type nlr_pop, @function
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nlr_pop:
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l32r a2, .LC1
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l32i.n a3, a2, 0
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l32i.n a3, a3, 0
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s32i.n a3, a2, 0
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ret.n
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.size nlr_pop, .-nlr_pop
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.literal_position
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.literal .LC2, NLR_TOP
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.align 4
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.global nlr_jump
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.type nlr_jump, @function
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nlr_jump:
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l32r a3, .LC2
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l32i.n a3, a3, 0 // a3 = nlr_top
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bnez.n a3, .L4
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call0 nlr_jump_fail
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.L4:
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s32i.n a2, a3, 4 // nlr_top->ret_val = val
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// restore regs
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l32i.n a0, a3, 8
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l32i.n a1, a3, 12
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l32i.n a8, a3, 16
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l32i.n a9, a3, 20
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l32i.n a10, a3, 24
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l32i.n a11, a3, 28
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l32i.n a12, a3, 32
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l32i.n a13, a3, 36
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l32i.n a14, a3, 40
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l32i.n a15, a3, 44
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l32i.n a3, a3, 0 // a3 = nlr_top->prev
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l32r a2, .LC2
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s32i.n a3, a2, 0 // nlr_top = a3
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movi.n a2, 1 // return 1
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ret.n
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.size nlr_jump, .-nlr_jump
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#endif // defined(__xtensa__)
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#if defined(linux)
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.section .note.GNU-stack,"",%progbits
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#endif
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103
py/nlrxtensa.c
Normal file
103
py/nlrxtensa.c
Normal file
@ -0,0 +1,103 @@
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/*
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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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