函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\binfmt_elf_fdpic.c Create Date:2022-07-29 11:03:56
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：load the appropriate binary image (executable or interpreter) into memory* - we assume no MMU is available* - if no other PIC bits are set in params->hdr->e_flags* - we assume that the LOADable segments in the binary are independently relocatable* - we

函数原型：static int elf_fdpic_map_file(struct elf_fdpic_params *params, struct file *file, struct mm_struct *mm, const char *what)

返回类型：int

参数：

类型参数名称
struct elf_fdpic_params *params
struct file *file
struct mm_struct *mm
const char *what
745  nloads等于0
746  以loop小于e_phnum循环如果p_type恒等于PT_LOAD则
748  nloads自加
750  如果nloads恒等于0则返回:负ELIBBAD
753  size等于loadmap的长度加nloads乘seg的长度
754  loadmap等于分配内存并置零
755  如果非loadmap则返回:负ENOMEM
758  loadmap to be passed to userspace 等于loadmap
760  version of these structures, just in case... 等于ELF32_FDPIC_LOADMAP_VERSION
761  number of segments 等于nloads
763  load_addr等于user address at which to map binary
764  seg等于segs
768  当: & == PT_LOADs require constant* displacement
769  当: & == PT_LOADs should be contiguous
776  默认
777  ret等于map a binary by direct mmap() of the individual PT_LOAD segments
778  如果ret小于0则返回:ret
780  退出
784  如果e_entry则
785  seg等于segs
786  以loop大于0循环
787  如果e_entry大于等于VMA recorded in file 且e_entry小于VMA recorded in file 加allocation size recorded in file 则
798  stop等于e_phoff
799  stop加等于e_phnum乘sizeof(structelf_phdr)
800  phdr等于 copy of PT_PHDR table
802  以loop小于e_phnum循环
803  如果p_type不等于PT_LOAD则继续下一循环
806  如果p_offset大于e_phoff或p_offset加p_filesz小于stop则继续下一循环
810  seg等于segs
811  以loop大于0循环
812  如果p_vaddr大于等于VMA recorded in file 且p_vaddr加p_filesz小于等于VMA recorded in file 加allocation size recorded in file 则
822  退出
826  phdr等于 copy of PT_PHDR table
827  以loop小于e_phnum循环
828  如果p_type不等于PT_DYNAMIC则继续下一循环
831  seg等于segs
832  以loop大于0循环
833  如果p_vaddr大于等于VMA recorded in file 且p_vaddr加p_memsz小于等于VMA recorded in file 加allocation size recorded in file 则
858  退出
866  nloads等于 number of segments
867  mseg等于segs
868  seg等于mseg加1
869  以loop小于nloads循环
871  如果VMA recorded in file 减VMA recorded in file 恒等于core address to which mapped 减core address to which mapped 则
872  load_addr等于 align the pointer to the (next) page boundary (core address to which mapped + allocation size recorded in file )
873  如果load_addr恒等于core address to which mapped 按位与PAGE_MASK的值则
884  mseg自加
885  如果mseg不等于seg则mseg等于seg
890  kdebug("Mapped Object [%s]:", what)
891  kdebug("- elfhdr : %lx", mapped ELF header user address )
892  kdebug("- entry : %lx", mapped entry user address )
893  kdebug("- PHDR[] : %lx", mapped PT_PHDR user address )
894  kdebug("- DYNAMIC[]: %lx", mapped PT_DYNAMIC user address )
895  seg等于segs
896  以loop小于 number of segments 循环kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", loop, core address to which mapped , core address to which mapped + allocation size recorded in file - 1, VMA recorded in file , allocation size recorded in file )
902  返回:0
904  dynamic_error :
905  printk - print a kernel message*@fmt: format string* This is printk(). It can be called from any context. We want it to work.* We try to grab the console_lock. If we succeed, it's easy - we log the* output and call the console drivers
907  返回:负ELIBBAD
调用者
名称描述
load_elf_fdpic_binaryload an fdpic binary into various bits of memory