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Diffstat (limited to 'circuitpython/py/nlrx64.c')
| -rw-r--r-- | circuitpython/py/nlrx64.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/circuitpython/py/nlrx64.c b/circuitpython/py/nlrx64.c new file mode 100644 index 0000000..f7e9260 --- /dev/null +++ b/circuitpython/py/nlrx64.c @@ -0,0 +1,114 @@ +/* + * 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_X64) && MICROPY_NLR_X64 + +#undef nlr_push + +// x86-64 callee-save registers are: +// rbx, rbp, rsp, r12, r13, r14, r15 + +__attribute__((used)) unsigned int nlr_push_tail(nlr_buf_t *nlr); + +unsigned int nlr_push(nlr_buf_t *nlr) { + (void)nlr; + + #if MICROPY_NLR_OS_WINDOWS + + __asm volatile ( + "movq (%rsp), %rax \n" // load return %rip + "movq %rax, 16(%rcx) \n" // store %rip into nlr_buf + "movq %rbp, 24(%rcx) \n" // store %rbp into nlr_buf + "movq %rsp, 32(%rcx) \n" // store %rsp into nlr_buf + "movq %rbx, 40(%rcx) \n" // store %rbx into nlr_buf + "movq %r12, 48(%rcx) \n" // store %r12 into nlr_buf + "movq %r13, 56(%rcx) \n" // store %r13 into nlr_buf + "movq %r14, 64(%rcx) \n" // store %r14 into nlr_buf + "movq %r15, 72(%rcx) \n" // store %r15 into nlr_buf + "movq %rdi, 80(%rcx) \n" // store %rdr into nlr_buf + "movq %rsi, 88(%rcx) \n" // store %rsi into nlr_buf + "jmp nlr_push_tail \n" // do the rest in C + ); + + #else + + __asm volatile ( + #if defined(__APPLE__) && defined(__MACH__) + "pop %rbp \n" // undo function's prelude + #endif + "movq (%rsp), %rax \n" // load return %rip + "movq %rax, 16(%rdi) \n" // store %rip into nlr_buf + "movq %rbp, 24(%rdi) \n" // store %rbp into nlr_buf + "movq %rsp, 32(%rdi) \n" // store %rsp into nlr_buf + "movq %rbx, 40(%rdi) \n" // store %rbx into nlr_buf + "movq %r12, 48(%rdi) \n" // store %r12 into nlr_buf + "movq %r13, 56(%rdi) \n" // store %r13 into nlr_buf + "movq %r14, 64(%rdi) \n" // store %r14 into nlr_buf + "movq %r15, 72(%rdi) \n" // store %r15 into nlr_buf + #if defined(__APPLE__) && defined(__MACH__) + "jmp _nlr_push_tail \n" // do the rest in C + #else + "jmp nlr_push_tail \n" // do the rest in C + #endif + ); + + #endif + + return 0; // needed to silence compiler warning +} + +NORETURN void nlr_jump(void *val) { + MP_NLR_JUMP_HEAD(val, top) + + __asm volatile ( + "movq %0, %%rcx \n" // %rcx points to nlr_buf + #if MICROPY_NLR_OS_WINDOWS + "movq 88(%%rcx), %%rsi \n" // load saved %rsi + "movq 80(%%rcx), %%rdi \n" // load saved %rdi + #endif + "movq 72(%%rcx), %%r15 \n" // load saved %r15 + "movq 64(%%rcx), %%r14 \n" // load saved %r14 + "movq 56(%%rcx), %%r13 \n" // load saved %r13 + "movq 48(%%rcx), %%r12 \n" // load saved %r12 + "movq 40(%%rcx), %%rbx \n" // load saved %rbx + "movq 32(%%rcx), %%rsp \n" // load saved %rsp + "movq 24(%%rcx), %%rbp \n" // load saved %rbp + "movq 16(%%rcx), %%rax \n" // load saved %rip + "movq %%rax, (%%rsp) \n" // store saved %rip to stack + "xorq %%rax, %%rax \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_X64 |