132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
// SPDX-FileCopyrightText: Copyright (c) 2013-2014 Damien P. George
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// SPDX-FileCopyrightText: 2014 MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)
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//
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// SPDX-License-Identifier: MIT
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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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#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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typedef mp_uint_t regs_t[6];
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STATIC void gc_helper_get_regs(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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typedef mp_uint_t regs_t[4];
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STATIC void gc_helper_get_regs(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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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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typedef mp_uint_t regs_t[10];
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STATIC void gc_helper_get_regs(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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// If we don't have architecture-specific optimized support,
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// just fall back to setjmp-based implementation.
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#undef MICROPY_GCREGS_SETJMP
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#define MICROPY_GCREGS_SETJMP (1)
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#endif // Arch-specific selection
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#endif // !MICROPY_GCREGS_SETJMP
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// If MICROPY_GCREGS_SETJMP was requested explicitly, or if
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// we enabled it as a fallback above.
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#if MICROPY_GCREGS_SETJMP
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#include <setjmp.h>
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typedef jmp_buf regs_t;
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STATIC void gc_helper_get_regs(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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void gc_collect(void) {
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gc_collect_start();
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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, ((mp_uint_t)MP_STATE_THREAD(stack_top) - (mp_uint_t)®s) / sizeof(mp_uint_t));
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#if MICROPY_EMIT_NATIVE
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mp_unix_mark_exec();
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#endif
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gc_collect_end();
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}
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#endif //MICROPY_ENABLE_GC
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