40 lines
881 B
C
40 lines
881 B
C
#include <stdlib.h>
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#include <stdint.h>
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#include <limits.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include "meta.h"
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static void donate(unsigned char *base, size_t len)
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{
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uintptr_t a = (uintptr_t)base;
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uintptr_t b = a + len;
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a += -a & (UNIT-1);
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b -= b & (UNIT-1);
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memset(base, 0, len);
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for (int sc=47; sc>0 && b>a; sc-=4) {
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if (b-a < (size_classes[sc]+1)*UNIT) continue;
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struct meta *m = alloc_meta();
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m->avail_mask = 0;
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m->freed_mask = 1;
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m->mem = (void *)a;
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m->mem->meta = m;
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m->last_idx = 0;
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m->freeable = 0;
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m->sizeclass = sc;
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m->maplen = 0;
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*((unsigned char *)m->mem+UNIT-4) = 0;
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*((unsigned char *)m->mem+UNIT-3) = 255;
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m->mem->storage[size_classes[sc]*UNIT-4] = 0;
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queue(&ctx.active[sc], m);
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a += (size_classes[sc]+1)*UNIT;
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}
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}
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void __malloc_donate(char *start, char *end)
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{
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donate((void *)start, end-start);
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}
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