710426024a
No functionality change is intended with this commit, it just consolidates the separate implementations of GC helper code to the lib/utils/ directory as a general set of helper functions useful for any port. This reduces duplication of code, and makes it easier for future ports or embedders to get the GC implementation correct. Ports should now link against gchelper_native.c and either gchelper_m0.s or gchelper_m3.s (currently only Cortex-M is supported but other architectures can follow), or use the fallback gchelper_generic.c which will work on x86/x64/ARM. The gc_helper_get_sp function from gchelper_m3.s is not really GC related and was only used by cc3200, so it has been moved to that port and renamed to cortex_m3_get_sp.
157 lines
5.1 KiB
C
157 lines
5.1 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, 2014 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 <stdio.h>
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#include "py/mpstate.h"
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#include "py/gc.h"
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#include "lib/utils/gchelper.h"
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#if MICROPY_ENABLE_GC
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// Even if we have specific support for an architecture, it is
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// possible to force use of setjmp-based implementation.
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#if !MICROPY_GCREGS_SETJMP
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// We capture here callee-save registers, i.e. ones which may contain
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// interesting values held there by our callers. It doesn't make sense
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// to capture caller-saved registers, because they, well, put on the
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// stack already by the caller.
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#if defined(__x86_64__)
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STATIC void gc_helper_get_regs(gc_helper_regs_t arr) {
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register long rbx asm ("rbx");
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register long rbp asm ("rbp");
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register long r12 asm ("r12");
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register long r13 asm ("r13");
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register long r14 asm ("r14");
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register long r15 asm ("r15");
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#ifdef __clang__
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// TODO:
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// This is dirty workaround for Clang. It tries to get around
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// uncompliant (wrt to GCC) behavior of handling register variables.
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// Application of this patch here is random, and done only to unbreak
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// MacOS build. Better, cross-arch ways to deal with Clang issues should
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// be found.
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asm ("" : "=r" (rbx));
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asm ("" : "=r" (rbp));
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asm ("" : "=r" (r12));
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asm ("" : "=r" (r13));
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asm ("" : "=r" (r14));
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asm ("" : "=r" (r15));
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#endif
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arr[0] = rbx;
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arr[1] = rbp;
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arr[2] = r12;
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arr[3] = r13;
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arr[4] = r14;
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arr[5] = r15;
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}
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#elif defined(__i386__)
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STATIC void gc_helper_get_regs(gc_helper_regs_t arr) {
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register long ebx asm ("ebx");
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register long esi asm ("esi");
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register long edi asm ("edi");
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register long ebp asm ("ebp");
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#ifdef __clang__
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// TODO:
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// This is dirty workaround for Clang. It tries to get around
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// uncompliant (wrt to GCC) behavior of handling register variables.
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// Application of this patch here is random, and done only to unbreak
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// MacOS build. Better, cross-arch ways to deal with Clang issues should
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// be found.
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asm ("" : "=r" (ebx));
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asm ("" : "=r" (esi));
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asm ("" : "=r" (edi));
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asm ("" : "=r" (ebp));
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#endif
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arr[0] = ebx;
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arr[1] = esi;
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arr[2] = edi;
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arr[3] = ebp;
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}
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#elif defined(__thumb2__) || defined(__thumb__) || defined(__arm__)
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// Fallback implementation, prefer gchelper_m0.s or gchelper_m3.s
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STATIC void gc_helper_get_regs(gc_helper_regs_t arr) {
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register long r4 asm ("r4");
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register long r5 asm ("r5");
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register long r6 asm ("r6");
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register long r7 asm ("r7");
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register long r8 asm ("r8");
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register long r9 asm ("r9");
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register long r10 asm ("r10");
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register long r11 asm ("r11");
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register long r12 asm ("r12");
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register long r13 asm ("r13");
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arr[0] = r4;
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arr[1] = r5;
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arr[2] = r6;
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arr[3] = r7;
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arr[4] = r8;
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arr[5] = r9;
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arr[6] = r10;
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arr[7] = r11;
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arr[8] = r12;
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arr[9] = r13;
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}
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#else
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#error "Architecture not supported for gc_helper_get_regs. Set MICROPY_GCREGS_SETJMP to use the fallback implementation."
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#endif
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#else // !MICROPY_GCREGS_SETJMP
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// Even if we have specific support for an architecture, it is
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// possible to force use of setjmp-based implementation.
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STATIC void gc_helper_get_regs(gc_helper_regs_t arr) {
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setjmp(arr);
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}
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#endif // MICROPY_GCREGS_SETJMP
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// Explicitly mark this as noinline to make sure the regs variable
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// is effectively at the top of the stack: otherwise, in builds where
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// LTO is enabled and a lot of inlining takes place we risk a stack
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// layout where regs is lower on the stack than pointers which have
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// just been allocated but not yet marked, and get incorrectly sweeped.
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MP_NOINLINE void gc_helper_collect_regs_and_stack(void) {
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gc_helper_regs_t regs;
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gc_helper_get_regs(regs);
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// GC stack (and regs because we captured them)
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void **regs_ptr = (void **)(void *)®s;
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gc_collect_root(regs_ptr, ((uintptr_t)MP_STATE_THREAD(stack_top) - (uintptr_t)®s) / sizeof(uintptr_t));
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}
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#endif // MICROPY_ENABLE_GC
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