elf_fdpic_map_file_by_direct

函数名称：map a binary by direct mmap() of the individual PT_LOAD segments

函数原型：static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, struct file *file, struct mm_struct *mm)

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

1023

prot等于0

1025

如果p_type不等于PT_LOAD则继续下一循环

1028

kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", (unsignedlong)p_vaddr, (unsignedlong)p_offset, (unsignedlong)p_filesz, (unsignedlong)p_memsz)

1035

如果p_flags按位与These constants define the permissions on sections in the programheader, p_flags. 则prot或等于page can be read

1036

如果p_flags按位与PF_W则prot或等于page can be written

1037

如果p_flags按位与PF_X则prot或等于page can be executed

1039

flags等于Changes are private 按位或ETXTBSY

1040

如果flags按位与T if this object is the executable 则flags或等于mark it as an executable

1043

maddr等于0

1046

当: & == PT_LOADs can be put anywhere

1048

退出

1050

当: & == PT_LOAD.vaddr must be honoured

1052

maddr等于p_vaddr

1053

flags或等于Interpret addr exactly

1054

退出

1056

当: & == PT_LOADs require constant* displacement

1061

如果非dvset则

1062

maddr等于load_addr

1063

delta_vaddr等于p_vaddr

1064

dvset等于1

1065

否则

1066

maddr等于load_addr加p_vaddr减delta_vaddr

1067

flags或等于Interpret addr exactly

1069

退出

1071

当: & == PT_LOADs should be contiguous

1073

退出

1075

默认

1076

BUG()

1079

maddr与等于PAGE_MASK

1082

disp等于p_vaddr按位与PAGE_MASK的反

1083

maddr等于vm_mmap(file, maddr, p_memsz + disp, prot, flags, p_offset - disp)

1086

kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", loop, p_memsz + disp, prot, flags, p_offset - disp, maddr)

1090

如果IS_ERR_VALUE(maddr)则返回:maddr

1093

如果flags按位与PT_LOAD arrangement flags 的值恒等于PT_LOADs should be contiguous 则load_addr加等于 align the pointer to the (next) page boundary (p_memsz + disp)

1097

core address to which mapped 等于maddr加disp

1098

VMA recorded in file 等于p_vaddr

1099

allocation size recorded in file 等于p_memsz

1102

如果p_offset恒等于0则mapped ELF header user address 等于core address to which mapped

1107

如果prot按位与page can be written 且disp大于0则

1108

kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp)

1109

如果用户内存块清零则返回:负EFAULT

1111

maddr加等于disp

1119

excess等于p_memsz减p_filesz

1120

excess1等于PAGE_SIZE减maddr加p_filesz按位与PAGE_MASK的反的值

1123

如果excess大于excess1则

1124

xaddr等于maddr加p_filesz加excess1

1127

flags或等于Interpret addr exactly 按位或don't use a file

1128

xmaddr等于vm_mmap(NULL, xaddr, excess - excess1, prot, flags, 0)

1131

kdebug("mmap[%d] <anon> ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", loop, xaddr, excess - excess1, prot, flags, xmaddr)

1136

如果xmaddr不等于xaddr则返回:负ENOMEM

1140

如果prot按位与page can be written 且excess1大于0则

1141

kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr + p_filesz, excess1)

1143

如果用户内存块清零则返回:负EFAULT

1157

如果mm则

1158

如果p_flags按位与PF_X则

1159

如果非start_code则

1160

start_code等于maddr

1161

end_code等于maddr加p_memsz

1163

否则如果非start_data则

1164

start_data等于maddr

1165

end_data等于maddr加p_memsz

1169

seg自加

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