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Additional resources for Assembly language programming for the COCO 3: an addendum to Assembly language programming for the TRS-80 color computer

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These calls are in fact the same in user-mode: the relevant Export entries2 map to the same address in memory. However, in kernel-mode, the Zw* system call stubs set the previous mode to kernel-mode, ensuring that certain parameter validation routines are not performed. The origin of the prefix "Zw" is unknown; it is rumored that this prefix was chosen due to its having no significance at all. In actual implementation, the system call stubs merely load two registers with values required to describe a native API call, and then execute a software interrupt (or the sysenter instruction).

Instead, each module (library or executable) must declare what functions or values it exports to other modules, and also what it wishes to import from other modules. As said above, a module cannot declare where in memory it expects a function or value to be. Instead, it declared where in its own memory it expects to find a pointer to the value it wishes to import. This permits the module to address any imported value, wherever it turns up in memory. 8 Exports Exports are functions and values in one module that have been declared to be shared with other modules.

The most important programs in the list are the GNU objdump, readelf, GAS assembler, and the GNU linker, although the reverser might find more use in addr2line, c++filt, nm, and readelf. org/software/binutils/ objdump 30 Other Tools for Linux Dumps out information about an executable including symbols and assembly. It comes standard. It can be made to support non-native binary formats. objdump -p displays a list of functions imported from other libraries, exported to and miscellaneous file header information It's useful to check dll dependencies from command line readelf Like objdump but more specialized for ELF executables.

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