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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2014 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.
*/
#if defined(__xtensa__)
/*
calling conventions:
a0 = return address
a1 = stack pointer
a2 = first arg, return value
a3-a7 = rest of args
*/
// the offset of nlr_top within mp_state_ctx_t
#define NLR_TOP_OFFSET (2 * 4)
#define NLR_TOP (mp_state_ctx + NLR_TOP_OFFSET)
.file "nlr.s"
.text
.literal_position
.literal .LC0, NLR_TOP
.align 4
.global nlr_push
.type nlr_push, @function
nlr_push:
// save regs
s32i.n a0, a2, 8
s32i.n a1, a2, 12
s32i.n a8, a2, 16
s32i.n a9, a2, 20
s32i.n a10, a2, 24
s32i.n a11, a2, 28
s32i.n a12, a2, 32
s32i.n a13, a2, 36
s32i.n a14, a2, 40
s32i.n a15, a2, 44
l32r a3, .LC0
l32i.n a4, a3, 0
s32i.n a2, a3, 0
s32i.n a4, a2, 0
movi.n a2, 0
ret.n
.size nlr_push, .-nlr_push
.literal_position
.literal .LC1, NLR_TOP
.align 4
.global nlr_pop
.type nlr_pop, @function
nlr_pop:
l32r a2, .LC1
l32i.n a3, a2, 0
l32i.n a3, a3, 0
s32i.n a3, a2, 0
ret.n
.size nlr_pop, .-nlr_pop
.literal_position
.literal .LC2, NLR_TOP
.align 4
.global nlr_jump
.type nlr_jump, @function
nlr_jump:
l32r a3, .LC2
l32i.n a3, a3, 0 // a3 = nlr_top
bnez.n a3, .L4
call0 nlr_jump_fail
.L4:
s32i.n a2, a3, 4 // nlr_top->ret_val = val
// restore regs
l32i.n a0, a3, 8
l32i.n a1, a3, 12
l32i.n a8, a3, 16
l32i.n a9, a3, 20
l32i.n a10, a3, 24
l32i.n a11, a3, 28
l32i.n a12, a3, 32
l32i.n a13, a3, 36
l32i.n a14, a3, 40
l32i.n a15, a3, 44
l32i.n a3, a3, 0 // a3 = nlr_top->prev
l32r a2, .LC2
s32i.n a3, a2, 0 // nlr_top = a3
movi.n a2, 1 // return 1
ret.n
.size nlr_jump, .-nlr_jump
#endif // defined(__xtensa__)
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