| /* |
| * This file is part of the MicroPython project, http://micropython.org/ |
| * |
| * The MIT License (MIT) |
| * |
| * Copyright (c) 2013-2016 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" |
| #include "py/nlr.h" |
| |
| #if (!defined(MICROPY_NLR_SETJMP) || !MICROPY_NLR_SETJMP) && (defined(__thumb2__) || defined(__thumb__) || defined(__arm__)) |
| |
| #undef nlr_push |
| |
| // We only need the functions here if we are on arm/thumb, and we are not |
| // using setjmp/longjmp. |
| // |
| // For reference, arm/thumb callee save regs are: |
| // r4-r11, r13=sp |
| |
| __attribute__((naked)) unsigned int nlr_push(nlr_buf_t *nlr) { |
| |
| __asm volatile ( |
| "str r4, [r0, #12] \n" // store r4 into nlr_buf |
| "str r5, [r0, #16] \n" // store r5 into nlr_buf |
| "str r6, [r0, #20] \n" // store r6 into nlr_buf |
| "str r7, [r0, #24] \n" // store r7 into nlr_buf |
| |
| #if defined(__ARM_ARCH_6M__) |
| "mov r1, r8 \n" |
| "str r1, [r0, #28] \n" // store r8 into nlr_buf |
| "mov r1, r9 \n" |
| "str r1, [r0, #32] \n" // store r9 into nlr_buf |
| "mov r1, r10 \n" |
| "str r1, [r0, #36] \n" // store r10 into nlr_buf |
| "mov r1, r11 \n" |
| "str r1, [r0, #40] \n" // store r11 into nlr_buf |
| "mov r1, r13 \n" |
| "str r1, [r0, #44] \n" // store r13=sp into nlr_buf |
| "mov r1, lr \n" |
| "str r1, [r0, #8] \n" // store lr into nlr_buf |
| #else |
| "str r8, [r0, #28] \n" // store r8 into nlr_buf |
| "str r9, [r0, #32] \n" // store r9 into nlr_buf |
| "str r10, [r0, #36] \n" // store r10 into nlr_buf |
| "str r11, [r0, #40] \n" // store r11 into nlr_buf |
| "str r13, [r0, #44] \n" // store r13=sp into nlr_buf |
| "str lr, [r0, #8] \n" // store lr into nlr_buf |
| #endif |
| |
| "b 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 __attribute__((naked)) 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 r0, %0 \n" // r0 points to nlr_buf |
| "ldr r4, [r0, #12] \n" // load r4 from nlr_buf |
| "ldr r5, [r0, #16] \n" // load r5 from nlr_buf |
| "ldr r6, [r0, #20] \n" // load r6 from nlr_buf |
| "ldr r7, [r0, #24] \n" // load r7 from nlr_buf |
| |
| #if defined(__ARM_ARCH_6M__) |
| "ldr r1, [r0, #28] \n" // load r8 from nlr_buf |
| "mov r8, r1 \n" |
| "ldr r1, [r0, #32] \n" // load r9 from nlr_buf |
| "mov r9, r1 \n" |
| "ldr r1, [r0, #36] \n" // load r10 from nlr_buf |
| "mov r10, r1 \n" |
| "ldr r1, [r0, #40] \n" // load r11 from nlr_buf |
| "mov r11, r1 \n" |
| "ldr r1, [r0, #44] \n" // load r13=sp from nlr_buf |
| "mov r13, r1 \n" |
| "ldr r1, [r0, #8] \n" // load lr from nlr_buf |
| "mov lr, r1 \n" |
| #else |
| "ldr r8, [r0, #28] \n" // load r8 from nlr_buf |
| "ldr r9, [r0, #32] \n" // load r9 from nlr_buf |
| "ldr r10, [r0, #36] \n" // load r10 from nlr_buf |
| "ldr r11, [r0, #40] \n" // load r11 from nlr_buf |
| "ldr r13, [r0, #44] \n" // load r13=sp from nlr_buf |
| "ldr lr, [r0, #8] \n" // load lr from nlr_buf |
| #endif |
| "movs r0, #1 \n" // return 1, non-local return |
| "bx lr \n" // return |
| : // output operands |
| : "r"(top) // input operands |
| : // clobbered registers |
| ); |
| |
| for (;;); // needed to silence compiler warning |
| } |
| |
| #endif // (!defined(MICROPY_NLR_SETJMP) || !MICROPY_NLR_SETJMP) && (defined(__thumb2__) || defined(__thumb__) || defined(__arm__)) |