6a3a742a6c
Each NLR implementation (Thumb, x86, x64, xtensa, setjmp) duplicates a lot of the NLR code, specifically that dealing with pushing and popping the NLR pointer to maintain the linked-list of NLR buffers. This patch factors all of that code out of the specific implementations into generic functions in nlr.c. This eliminates duplicated code. The factoring also allows to make the machine-specific NLR code pure assembler code, thus allowing nlrthumb.c to use naked function attributes in the correct way (naked functions can only have basic inline assembler code in them). There is a small overhead introduced (typically 1 machine instruction) because now the generic nlr_jump() must call nlr_jump_tail() rather than them being one combined function.
124 lines
4.6 KiB
C
124 lines
4.6 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013-2017 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/mpstate.h"
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#if MICROPY_NLR_X64
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#undef nlr_push
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// x86-64 callee-save registers are:
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// rbx, rbp, rsp, r12, r13, r14, r15
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#if defined(_WIN32) || defined(__CYGWIN__)
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#define NLR_OS_WINDOWS 1
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#else
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#define NLR_OS_WINDOWS 0
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#endif
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unsigned int nlr_push(nlr_buf_t *nlr) {
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(void)nlr;
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#if NLR_OS_WINDOWS
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__asm volatile (
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"movq (%rsp), %rax \n" // load return %rip
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"movq %rax, 16(%rcx) \n" // store %rip into nlr_buf
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"movq %rbp, 24(%rcx) \n" // store %rbp into nlr_buf
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"movq %rsp, 32(%rcx) \n" // store %rsp into nlr_buf
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"movq %rbx, 40(%rcx) \n" // store %rbx into nlr_buf
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"movq %r12, 48(%rcx) \n" // store %r12 into nlr_buf
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"movq %r13, 56(%rcx) \n" // store %r13 into nlr_buf
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"movq %r14, 64(%rcx) \n" // store %r14 into nlr_buf
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"movq %r15, 72(%rcx) \n" // store %r15 into nlr_buf
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"movq %rdi, 80(%rcx) \n" // store %rdr into nlr_buf
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"movq %rsi, 88(%rcx) \n" // store %rsi into nlr_buf
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"jmp nlr_push_tail \n" // do the rest in C
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);
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#else
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__asm volatile (
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#if defined(__APPLE__) || defined(__MACH__)
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"pop %rbp \n" // undo function's prelude
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#endif
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"movq (%rsp), %rax \n" // load return %rip
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"movq %rax, 16(%rdi) \n" // store %rip into nlr_buf
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"movq %rbp, 24(%rdi) \n" // store %rbp into nlr_buf
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"movq %rsp, 32(%rdi) \n" // store %rsp into nlr_buf
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"movq %rbx, 40(%rdi) \n" // store %rbx into nlr_buf
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"movq %r12, 48(%rdi) \n" // store %r12 into nlr_buf
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"movq %r13, 56(%rdi) \n" // store %r13 into nlr_buf
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"movq %r14, 64(%rdi) \n" // store %r14 into nlr_buf
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"movq %r15, 72(%rdi) \n" // store %r15 into nlr_buf
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#if defined(__APPLE__) || defined(__MACH__)
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"jmp _nlr_push_tail \n" // do the rest in C
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#else
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"jmp nlr_push_tail \n" // do the rest in C
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#endif
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);
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#endif
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return 0; // needed to silence compiler warning
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}
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NORETURN void nlr_jump_tail(nlr_buf_t *top) {
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(void)top;
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__asm volatile (
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#if NLR_OS_WINDOWS
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"movq 88(%rcx), %rsi \n" // load saved %rsi
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"movq 80(%rcx), %rdi \n" // load saved %rdr
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"movq 72(%rcx), %r15 \n" // load saved %r15
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"movq 64(%rcx), %r14 \n" // load saved %r14
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"movq 56(%rcx), %r13 \n" // load saved %r13
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"movq 48(%rcx), %r12 \n" // load saved %r12
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"movq 40(%rcx), %rbx \n" // load saved %rbx
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"movq 32(%rcx), %rsp \n" // load saved %rsp
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"movq 24(%rcx), %rbp \n" // load saved %rbp
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"movq 16(%rcx), %rax \n" // load saved %rip
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#else
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"movq 72(%rdi), %r15 \n" // load saved %r15
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"movq 64(%rdi), %r14 \n" // load saved %r14
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"movq 56(%rdi), %r13 \n" // load saved %r13
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"movq 48(%rdi), %r12 \n" // load saved %r12
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"movq 40(%rdi), %rbx \n" // load saved %rbx
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"movq 32(%rdi), %rsp \n" // load saved %rsp
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"movq 24(%rdi), %rbp \n" // load saved %rbp
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"movq 16(%rdi), %rax \n" // load saved %rip
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#endif
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"movq %rax, (%rsp) \n" // store saved %rip to stack
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"xorq %rax, %rax \n" // clear return register
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"inc %al \n" // increase to make 1, non-local return
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"ret \n" // return
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);
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for (;;); // needed to silence compiler warning
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}
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#endif // MICROPY_NLR_X64
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