py: Add NLR support for xtensa CPU.
Damien George
parent
92f1ed8f40
commit
2399aa03b8
2
py/nlr.h
2
py/nlr.h
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@ -47,6 +47,8 @@ struct _nlr_buf_t {
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#endif
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#elif defined(__thumb2__) || defined(__thumb__) || defined(__arm__)
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void *regs[10];
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#elif defined(__xtensa__)
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void *regs[10];
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#else
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#define MICROPY_NLR_SETJMP (1)
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//#warning "No native NLR support for this arch, using setjmp implementation"
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@ -0,0 +1,114 @@
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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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.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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.local nlr_top
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.comm nlr_top,4,4
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#endif // defined(__xtensa__)
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