裸机 (elf) 程序构建的 dlmalloc 编译期间出错

Question

我正在使用 gnu sparc 工具链。我有 sparc-ab-elf-gcc 和 sparc-ab-linux-gcc。 （'ab' 是处理器名称）。我想在baremetal（没有操作系统）上编译一个使用malloc和free（这个程序应该在linux上运行）的程序。所以我应该使用 sparc-ab-elf-gcc 编译它。我听说我可以在这种情况下使用 dlmalloc。 （请参阅 stdlib-like library on bare metal environment? (memory management and hopefully pthread support) ）但我看到一些简单测试程序的编译错误，它每次只执行一次 malloc 和 free 。

// test malloc, realloc and free
#include <aldebaran.h>
#include <malloc.h>


int main()
{
int i;

ab_printf("%s\n",CKIM_XX);
char *buff = dlmalloc(100);
for(i = 0; i < 100; i++) {
    buff[i] = (char) i;
}
ab_printf("buff = %x\n'");
for(i=0; i<100; i++) {
    ab_printf("%d ", buff[i]);
}
ab_printf("\n");
dlfree(buff);
return 0;
}


ckim@stph45:~/prj2/abts/yolo-bare/darknet] make test3
sparc-ab-elf-gcc -c -I./src -I../include -I/opt/abde/sparc-ab-elf/include    -DALDEBARAN_FPGA -DABC_CT -O3 -ffast-math -fcommon -msoft-float -mcpu=v8  -Wa,-xarch=v8plusb -Wall -Wfatal-errors   ./src/malloc.c -o obj/malloc.o
./src/malloc.c:571:40: fatal error: sys/mman.h: No such file or directory
compilation terminated.
make: *** [obj/malloc.o] Error 1

我的裸机系统没有 sys/mman.h（我在 elf 工具链库上搜索过）所以在定义 LACKS_SYS_MMAN_H 后再次尝试并得到了

ckim@stph45:~/prj2/abts/yolo-bare/darknet] make test3
sparc-ab-elf-gcc -c -I./src -I../include -I/opt/abde/sparc-ab-elf/include    -DALDEBARAN_FPGA -DABC_CT -O3 -ffast-math -fcommon -msoft-float -mcpu=v8  -Wa,-xarch=v8plusb -Wall -Wfatal-errors  -DLACKS_SYS_MMAN_H  ./src/test3.c -o obj/test3.o
sparc-ab-elf-gcc -c -I./src -I../include -I/opt/abde/sparc-ab-elf/include    -DALDEBARAN_FPGA -DABC_CT -O3 -ffast-math -fcommon -msoft-float -mcpu=v8  -Wa,-xarch=v8plusb -Wall -Wfatal-errors  -DLACKS_SYS_MMAN_H  ./src/malloc.c -o obj/malloc.o
./src/malloc.c: In function 'mmap_alloc':
./src/malloc.c:2924:5: warning: implicit declaration of function 'mmap' [-Wimplicit-function-declaration]
./src/malloc.c:2924:24: error: 'PROT_READ' undeclared (first use in this function)
compilation terminated due to -Wfatal-errors.
make: *** [obj/malloc.o] Error 1

dlmalloc.c 是一个很长的程序。 （我把它分为malloc.h和malloc.c）下面是函数出错..

/* Malloc using mmap */
static void* mmap_alloc(mstate m, size_t nb) {
  size_t mmsize = mmap_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
  if (m->footprint_limit != 0) {
    size_t fp = m->footprint + mmsize;
    if (fp <= m->footprint || fp > m->footprint_limit)
      return 0;
  }
  if (mmsize > nb) {     /* Check for wrap around 0 */
    char* mm = (char*)(CALL_DIRECT_MMAP(mmsize));    <=== line causing error.
    if (mm != CMFAIL) {
      size_t offset = align_offset(chunk2mem(mm));
      size_t psize = mmsize - offset - MMAP_FOOT_PAD;
      mchunkptr p = (mchunkptr)(mm + offset);
      p->prev_foot = offset;
      p->head = psize;
      mark_inuse_foot(m, p, psize);
      chunk_plus_offset(p, psize)->head = FENCEPOST_HEAD;
      chunk_plus_offset(p, psize+SIZE_T_SIZE)->head = 0;

      if (m->least_addr == 0 || mm < m->least_addr)
        m->least_addr = mm;
      if ((m->footprint += mmsize) > m->max_footprint)
        m->max_footprint = m->footprint;
      assert(is_aligned(chunk2mem(p)));
      check_mmapped_chunk(m, p);
      return chunk2mem(p);
    }
  }
  return 0;
}

谁能给我点灯？

Answer 1

听说我可以在这个案例中使用 dlmalloc

再读一遍那个答案。特别注意：“...您应该能够适应 ...”。你还没有完成适配部分。