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 6.3.x

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/*

* This file is part of the MicroPython project, http://micropython.org/

*

* The MIT License (MIT)

*

* SPDX-FileCopyrightText: Copyright (c) 2013-2017 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.

*/

#include "py/mpstate.h"

#if defined(MICROPY_NLR_X86) && MICROPY_NLR_X86

#undef nlr_push

// For reference, x86 callee save regs are:

// ebx, esi, edi, ebp, esp, eip

#if defined(MICROPY_NLR_OS_WINDOWS) && MICROPY_NLR_OS_WINDOWS

unsigned int nlr_push_tail(nlr_buf_t *nlr) asm ("nlr_push_tail");

#else

__attribute__((used)) unsigned int nlr_push_tail(nlr_buf_t *nlr);

#endif

#if !defined(__clang__) && defined(__GNUC__) && __GNUC__ >= 8

// Since gcc 8.0 the naked attribute is supported

#define USE_NAKED (1)

#define UNDO_PRELUDE (0)

#elif defined(__ZEPHYR__) || defined(__ANDROID__)

// Zephyr and Android use a different calling convention by default

#define USE_NAKED (0)

#define UNDO_PRELUDE (0)

#else

#define USE_NAKED (0)

#define UNDO_PRELUDE (1)

#endif

#if USE_NAKED

__attribute__((naked))

#endif

unsigned int nlr_push(nlr_buf_t *nlr) {

#if !USE_NAKED

(void)nlr;

#endif

__asm volatile (

#if UNDO_PRELUDE

"pop %ebp \n" // undo function's prelude

#endif

"mov 4(%esp), %edx \n" // load nlr_buf

"mov (%esp), %eax \n" // load return %eip

"mov %eax, 8(%edx) \n" // store %eip into nlr_buf

"mov %ebp, 12(%edx) \n" // store %ebp into nlr_buf

"mov %esp, 16(%edx) \n" // store %esp into nlr_buf

"mov %ebx, 20(%edx) \n" // store %ebx into nlr_buf

"mov %edi, 24(%edx) \n" // store %edi into nlr_buf

"mov %esi, 28(%edx) \n" // store %esi into nlr_buf

"jmp nlr_push_tail \n" // do the rest in C

);

#if !USE_NAKED

return 0; // needed to silence compiler warning

#endif

}

NORETURN void nlr_jump(void *val) {

MP_NLR_JUMP_HEAD(val, top)

__asm volatile (

"mov %0, %%edx \n" // %edx points to nlr_buf

"mov 28(%%edx), %%esi \n" // load saved %esi

"mov 24(%%edx), %%edi \n" // load saved %edi

"mov 20(%%edx), %%ebx \n" // load saved %ebx

"mov 16(%%edx), %%esp \n" // load saved %esp

"mov 12(%%edx), %%ebp \n" // load saved %ebp

"mov 8(%%edx), %%eax \n" // load saved %eip

"mov %%eax, (%%esp) \n" // store saved %eip to stack

"xor %%eax, %%eax \n" // clear return register

"inc %%al \n" // increase to make 1, non-local return

"ret \n" // return

: // output operands

: "r" (top) // input operands

: // clobbered registers

);

MP_UNREACHABLE

}

#endif // MICROPY_NLR_X86