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nlrx64.c
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nlrx64.c
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/*
* 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_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);
#if !MICROPY_NLR_OS_WINDOWS
#if defined(__clang__) || (defined(__GNUC__) && __GNUC__ >= 8)
#define USE_NAKED 1
#else
// On older gcc the equivalent here is to force omit-frame-pointer
__attribute__((optimize("omit-frame-pointer")))
#endif
#endif
#if !defined(USE_NAKED)
#define USE_NAKED 0
#endif
#if USE_NAKED
// nlr_push prelude should never push frame pointer register ebp onto the stack
__attribute__((naked))
#endif
unsigned int nlr_push(nlr_buf_t *nlr) {
#if !USE_NAKED
(void)nlr;
#endif
#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 (
"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
#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 (
"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
: "memory" // clobbered registers
);
MP_UNREACHABLE
}
#endif // MICROPY_NLR_X64