缓冲区由内核模块分配,内核模块应该分配连续的内存块,然后通过mmap()调用将内存映射到用户空间。但是,GDB似乎无法随时访问这些块。例如,在GDB中遇到断点后: (gdb) x /10xb 0x4567e000 0x4567e000: Cannot access memory at address 0x4567e000 但是,在/ proc // smaps中查看应用程序当前映射的内存区域显示: 4567...
The MAP_FIXED flag value specifies that the virtual address has been specified through theaddrparameter. Themmap()function will use the value ofaddras the starting point of the memory map. When MAP_FIXED is set in the flags parameter, the system is informed that the return value must be eq...
在Linux上尝试在用户空间中测试Is it allowed to access memory that spans the zero boundary in x86?时,我写了一个32位测试程序,试图映射32位虚拟地址空间的低页和高页. 回声0 |后sudo tee / proc / sys / vm / mmap_min_addr,我可以映射零页面,但我不知道为什么我不能映射-4096,即(void *)0xfffff...
address_variable If this variable is null (length=0), the system selects the address and the value is returned in this variable. The address is a hex string. length The size in bytes of the memory mapping to be created. map_type ...
在Linux上尝试在用户空间中测试Is it allowed to access memory that spans the zero boundary in x86?时,我写了一个32位测试程序,试图映射32位虚拟地址空间的低页和高页. 回声0 |后sudo tee / proc / sys / vm / mmap_min_addr,我可以映射零页面,但我不知道为什么我不能映射-4096,即(void *)0xfffff...
Dan's answer to both problems is a patch set adding a new function for the mapping of device memory that behaves like memory:void*memremap(resource_size_t offset, size_t size, unsignedlongflags); This function will (on success)returnan addressfora mapping to the device memory found at the...
Pre-allocate guest address space May 29, 2010 297 } 298 } 299 } 300 linux-user: Rewrite mmap_find_vma() to work fine on 64-bit hosts with… Aug 13, 2009 301 /* 302 * Find and reserve a free memory area of size 'size'. The search 303 * starts at 'start'. 304 * ...
一、表达式 print和许多GDB的命令一样，可以接受一个表达式，GDB会根据当前的程序运行的数据来计算这个表...
(PyExc_ValueError, "mmap invalid access parameter."); } if (map_size < 0) { PyErr_SetString(PyExc_OverflowError, "memory mapped length must be positive"); return NULL; } if (offset < 0) { PyErr_SetString(PyExc_OverflowError, "memory mapped offset must be positive"); return NULL;...
Specifies that the system select an address for the new memory region if the new memory region cannot be mapped at the address specified by the addr parameter, or if the addr parameter is null. Only one of the MAP_VARIABLE and MAP_FIXED flags must be specified with the mmap subroutine. ...