116 lines
4.1 KiB
C
116 lines
4.1 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* 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 !MICROPY_NLR_SETJMP && defined(__i386__)
|
|
|
|
#undef nlr_push
|
|
|
|
// For reference, x86 callee save regs are:
|
|
// ebx, esi, edi, ebp, esp, eip
|
|
|
|
#if defined(_WIN32) || defined(__CYGWIN__)
|
|
#define NLR_OS_WINDOWS 1
|
|
#else
|
|
#define NLR_OS_WINDOWS 0
|
|
#endif
|
|
|
|
#if 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
|
|
|
|
unsigned int nlr_push(nlr_buf_t *nlr) {
|
|
(void)nlr;
|
|
|
|
__asm volatile (
|
|
// Check for Zephyr, which uses a different calling convention
|
|
// by default.
|
|
// TODE: Better support for various x86 calling conventions
|
|
// (unfortunately, __attribute__((naked)) is not supported on x86).
|
|
#if !(defined(__ZEPHYR__) || defined(__ANDROID__))
|
|
"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
|
|
);
|
|
|
|
return 0; // needed to silence compiler warning
|
|
}
|
|
|
|
__attribute__((used)) unsigned int nlr_push_tail(nlr_buf_t *nlr) {
|
|
nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
|
|
nlr->prev = *top;
|
|
*top = nlr;
|
|
return 0; // normal return
|
|
}
|
|
|
|
void nlr_pop(void) {
|
|
nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
|
|
*top = (*top)->prev;
|
|
}
|
|
|
|
NORETURN void nlr_jump(void *val) {
|
|
nlr_buf_t **top_ptr = &MP_STATE_THREAD(nlr_top);
|
|
nlr_buf_t *top = *top_ptr;
|
|
if (top == NULL) {
|
|
nlr_jump_fail(val);
|
|
}
|
|
|
|
top->ret_val = val;
|
|
*top_ptr = top->prev;
|
|
|
|
__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
|
|
);
|
|
|
|
for (;;); // needed to silence compiler warning
|
|
}
|
|
|
|
#endif // !MICROPY_NLR_SETJMP && defined(__i386__)
|