/*

* 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_THUMB

#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) {

// If you get a linker error here, indicating that a relocation doesn't

// fit, try the following (in that order):

//

// 1. Ensure that nlr.o nlrthumb.o are linked closely together, i.e.

// there aren't too many other files between them in the linker list

// (PY_CORE_O_BASENAME in py/py.mk)

// 2. Set -DMICROPY_NLR_THUMB_USE_LONG_JUMP=1 during the build

//

__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(__thumb2__)

"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

#if MICROPY_NLR_NUM_REGS == 16

"vstr d8, [r0, #48] \n" // store s16-s17 into nlr_buf

"vstr d9, [r0, #56] \n" // store s18-s19 into nlr_buf

"vstr d10, [r0, #64] \n" // store s20-s21 into nlr_buf

#endif

"str lr, [r0, #8] \n" // store lr into nlr_buf

#endif

#if MICROPY_NLR_THUMB_USE_LONG_JUMP

"ldr r1, nlr_push_tail_var \n"

"bx r1 \n" // do the rest in C

".align 2 \n"

"nlr_push_tail_var: .word nlr_push_tail \n"

#else

#if defined(__APPLE__) || defined(__MACH__)

"b _nlr_push_tail \n" // do the rest in C

#else

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

#endif

#endif

);

#if !defined(__clang__) && defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8))

// Older versions of gcc give an error when naked functions don't return a value

// Additionally exclude Clang as it also defines __GNUC__ but doesn't need this statement

return 0;

#endif

}

NORETURN void nlr_jump(void *val) {

MP_NLR_JUMP_HEAD(val, top)

__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(__thumb2__)

"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

#if MICROPY_NLR_NUM_REGS == 16

"vldr d8, [r0, #48] \n" // load s16-s17 from nlr_buf

"vldr d9, [r0, #56] \n" // load s18-s19 from nlr_buf

"vldr d10, [r0, #64] \n" // load s20-s21 from nlr_buf

#endif

"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

: "memory" // clobbered registers

);

MP_UNREACHABLE

}

#endif // MICROPY_NLR_THUMB