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114 lines
4.1 KiB
114 lines
4.1 KiB
/*
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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) 2013-2017 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/mpconfig.h"
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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(__i386__)
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#undef nlr_push
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// For reference, x86 callee save regs are:
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// ebx, esi, edi, ebp, esp, eip
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#define NLR_OS_WINDOWS (defined(_WIN32) || defined(__CYGWIN__))
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#if NLR_OS_WINDOWS
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unsigned int nlr_push_tail(nlr_buf_t *nlr) asm("nlr_push_tail");
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#else
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__attribute__((used)) unsigned int nlr_push_tail(nlr_buf_t *nlr);
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#endif
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unsigned int nlr_push(nlr_buf_t *nlr) {
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(void)nlr;
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__asm volatile (
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// Check for Zephyr, which uses a different calling convention
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// by default.
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// TODO: Better check for Zephyr.
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// TODE: Better support for various x86 calling conventions
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// (unfortunately, __attribute__((naked)) is not supported on x86).
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#ifndef CONFIG_SOC_IA32
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"pop %ebp \n" // undo function's prelude
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#endif
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"mov 4(%esp), %edx \n" // load nlr_buf
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"mov (%esp), %eax \n" // load return %eip
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"mov %eax, 8(%edx) \n" // store %eip into nlr_buf
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"mov %ebp, 12(%edx) \n" // store %ebp into nlr_buf
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"mov %esp, 16(%edx) \n" // store %esp into nlr_buf
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"mov %ebx, 20(%edx) \n" // store %ebx into nlr_buf
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"mov %edi, 24(%edx) \n" // store %edi into nlr_buf
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"mov %esi, 28(%edx) \n" // store %esi into nlr_buf
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"jmp 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 %0, %%edx \n" // %edx points to nlr_buf
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"mov 28(%%edx), %%esi \n" // load saved %esi
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"mov 24(%%edx), %%edi \n" // load saved %edi
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"mov 20(%%edx), %%ebx \n" // load saved %ebx
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"mov 16(%%edx), %%esp \n" // load saved %esp
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"mov 12(%%edx), %%ebp \n" // load saved %ebp
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"mov 8(%%edx), %%eax \n" // load saved %eip
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"mov %%eax, (%%esp) \n" // store saved %eip to stack
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"xor %%eax, %%eax \n" // clear return register
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"inc %%al \n" // increase to make 1, non-local return
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"ret \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(__i386__)
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