Position-Independent Code

Generating Position-Independent Code

When building shared libraries and incomplete executables, the linker modifies the plabel calculation (produced by the compilers in both shared libraries and incomplete executables) to load the contents of a DLT entry, which is built for each symbol associated with a CODE_PLABEL fixup.

In shared libraries and incomplete executables, a plabel value is the address of a PLT entry for the target routine, rather than a procedure address; therefore $$dyncall must be used when calling a routine with a procedure label. The linker sets the second-to-last bit in the procedure label to flag this as a special PLT procedure label. The $$dyncall routine checks this bit to determine which type of procedure label has been passed, and calls the target procedure accordingly.

In order to generate a procedure label that can be used for shared libraries and incomplete executables, assembly code must specify that a procedure address is being taken (and that a plabel is wanted) by using the P' assembler fixup mode. For example, to generate an assembly plabel, the following sequence must be used:

LDIL LP'function,%r1

LDO RP'function(%r1), %r22 ; Now to call the routine

BL $$dyncall, %r31 ; r22 is the input register for $$dyncall COPY %r31, %r2

This code sequence generates the necessary PLABEL fixups that the linker needs in order to generate the proper procedure label. The dyncall millicode routine in /usr/lib/milli.a must be used to call a procedure using this type of procedure label; that is, a BL or BV will not work).

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Chapter 7

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HP 9000 specifications

The Kenwood HP 9000 is a cutting-edge home appliance designed for culinary enthusiasts seeking to elevate their cooking experience. This powerful kitchen machine stands out for its multi-functionality, combining the roles of a food processor, blender, and mixer into one sleek unit.

One of the flagship features of the Kenwood HP 9000 is its robust motor, which delivers exceptional performance across various tasks. With a powerful motor that operates at multiple speeds, users can tackle everything from kneading dough to finely chopping vegetables with ease. The variable speed control allows for precision, ensuring that every ingredient is processed to perfection according to individual preferences.

The HP 9000 comes equipped with a variety of attachments that enhance its versatility. Among these are a stainless-steel mixing bowl, a dough hook, a whisk, and multiple cutting blades. This extensive array of accessories means that users can whip up delightful pastries, create homemade pasta, or prepare smoothies with minimal hassle. Each attachment is designed for easy attachment and removal, making the transition between tasks seamless and efficient.

Another key characteristic of the Kenwood HP 9000 is its advanced safety features. The design incorporates mechanisms that prevent the machine from operating unless all components are securely in place. This not only gives users peace of mind while cooking but also ensures longevity for the appliance, reducing the risk of wear and tear over time.

In terms of design, the HP 9000 is both modern and aesthetically pleasing. Its ergonomic shape and compact size make it easy to store and use in various kitchen settings, while the high-quality materials used in its construction guarantee durability and longevity. The user interface is intuitive, with clearly labeled buttons that facilitate operation, ensuring that even novice cooks can navigate the machine effortlessly.

Additionally, the Kenwood HP 9000 features innovative technologies, such as an integrated digital timer and a pulse function for added control during food preparation. These features enhance cooking precision, allowing users to achieve consistent results every time.

In summary, the Kenwood HP 9000 is an exceptional kitchen appliance that combines power, versatility, and safety. With its advanced features and user-friendly design, it is an ideal choice for anyone looking to simplify their cooking process while achieving professional-level results. Whether you're whipping up a quick meal or tackling an elaborate recipe, the HP 9000 is a reliable companion that will inspire culinary creativity.