mirror of
https://github.com/esp8266/Arduino.git
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127 lines
3.2 KiB
ArmAsm
127 lines
3.2 KiB
ArmAsm
/*
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cont.S - continuations support for Xtensa call0 ABI
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Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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.text
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.align 4
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.literal_position
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.global cont_yield
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.type cont_yield, @function
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cont_yield:
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/* a1: sp */
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/* a2: void* cont_ctx */
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/* adjust stack and save registers */
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addi a1, a1, -24
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s32i a12, a1, 0
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s32i a13, a1, 4
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s32i a14, a1, 8
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s32i a15, a1, 12
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s32i a0, a1, 16
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s32i a2, a1, 20
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/* &cont_continue -> cont_ctx.pc_yield */
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movi a3, cont_continue
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s32i a3, a2, 8
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/* sp -> cont_ctx.sp_yield */
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s32i a1, a2, 12
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/* a0 <- cont_ctx.pc_ret */
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l32i a0, a2, 0
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/* sp <- cont_ctx.sp_ret */
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l32i a1, a2, 4
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jx a0
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cont_continue:
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l32i a12, a1, 0
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l32i a13, a1, 4
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l32i a14, a1, 8
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l32i a15, a1, 12
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l32i a0, a1, 16
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l32i a2, a1, 20
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addi a1, a1, 24
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ret
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.size cont_yield, . - cont_yield
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////////////////////////////////////////////////////
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.text
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.align 4
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.literal_position
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.global cont_run
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.type cont_run, @function
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cont_run:
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/* a1: sp */
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/* a2: void* cont_ctx */
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/* a3: void (*pfn) */
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/* adjust stack and save registers */
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addi a1, a1, -20
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s32i a12, a1, 0
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s32i a13, a1, 4
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s32i a14, a1, 8
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s32i a15, a1, 12
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s32i a0, a1, 16
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/* cont_ret -> a4 -> cont_ctx.pc_ret*/
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movi a4, cont_ret
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s32i a4, a2, 0
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/* sp -> cont_ctx.sp_ret */
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s32i a1, a2, 4
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/* if cont_ctx.pc_yield != 0, goto cont_resume */
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l32i a4, a2, 8
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bnez a4, cont_resume
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/* else */
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/* set new stack*/
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l32i a1, a2, 16;
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/* goto pfn */
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movi a0, cont_norm
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jx a3
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cont_resume:
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/* a1 <- cont_ctx.sp_yield */
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l32i a1, a2, 12
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/* reset yield flag, 0 -> cont_ctx.pc_yield */
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movi a3, 0
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s32i a3, a2, 8
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/* jump to saved cont_ctx.pc_yield */
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movi a0, cont_ret
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jx a4
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cont_norm:
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/* calculate pointer to cont_ctx.struct_start from sp */
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l32i a2, a1, 4
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/* sp <- cont_ctx.sp_ret */
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l32i a1, a2, 4
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/* 0 -> cont_ctx.pc_ret */
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movi a4, 0
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s32i a4, a2, 0
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cont_ret:
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/* restore registers */
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l32i a12, a1, 0
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l32i a13, a1, 4
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l32i a14, a1, 8
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l32i a15, a1, 12
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l32i a0, a1, 16
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/* adjust stack and return */
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addi a1, a1, 20
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ret
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.size cont_run, . - cont_run
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