Contents
What is a relocation table?
The relocation table is a list of pointers created by the translator (a compiler or assembler) and stored in the object or executable file. Fixups are designed to support relocation of the program as a complete unit.
What is mean by relocatable address?
An address expression with a value that depends on run-time considerations is called a relocatable address expression. A relocatable expression with a value that depends only on where a single control section is located in memory is called simply relocatable.
What is .reloc section?
The .reloc section is a list of places in the image where. the difference between the linker assumed load address and the actual load. address needs to be factored in.
What is a symbolic address?
A symbolic address corresponds to a symbol in a program or a symbol defined by the EQUATE subcommand. For a detailed description on the use of symbols, see Restrictions on the Use of Symbols.
What is absolute address?
absolute address A unique number that specifies a unique location within the address space where an operand is to be found/deposited, or where an instruction is located. It generally specifies a memory location but in some cases specifies a machine register or an I/O device.
Where are the instructions stored in PE file?
When building applications on Windows, the linker sends instruction to a binary called winstub.exe to the executable file. This file is kept in the address 0x3c, which is offset to the next PE header section.
What is the role of a relocation register?
Single-partition allocation In this type of allocation, relocation-register scheme is used to protect user processes from each other, and from changing operating-system code and data. Relocation register contains value of smallest physical address whereas limit register contains range of logical addresses.
How do you negotiate a relocation package?
How to negotiate relocation assistance
- Research typical relocation packages. The first step is to find out what kinds of relocation assistance are typical for someone in your particular situation.
- Assess your own needs. Ask yourself what you might need from a relocation package.
- Emphasize mutual benefits.
Will you be comfortable relocating?
Answering that you are definitely willing to relocate will show that you want to do whatever is necessary to be a part of the company and team. A formal answer would be: “For the right opportunity I am definitely willing to relocate. I believe that this position and company is that opportunity.”
Where are the pointers in the relocation table?
The relocation table is a list of pointers created by the translator (a compiler or assembler) and stored in the object or executable file. Each entry in the table, or “fixup”, is a pointer to an absolute address in the object code that must be changed when the loader relocates the program so that it will refer to the correct location.
How is relocation performed in MIXAL assembly language?
The linker reads segment information and relocation tables in the object files and performs relocation by: referring to the relocation table to modify symbols so that they point to the correct run time addresses. The following example uses Donald Knuth ‘s MIX architecture and MIXAL assembly language.
How does the EXE loader use a relocation table?
The EXE loader uses a relocation table to find the segments which need to be adjusted. With 32-bit Windows operating systems it is not mandatory to provide relocation tables for EXE files, since they are the first image loaded into the virtual address space and thus will be loaded at their preferred base address.
How are fixups used to support relocation of a program?
Fixups are designed to support relocation of the program as a complete unit. In some cases, each fixup in the table is itself relative to a base address of zero, so the fixups themselves must be changed as the loader moves through the table.