Position-Independent Code

Generating Position-Independent Code

Global and Static Variable References

References to global or static variables currently require two instructions either to form the address of a variable, or to load or store the contents of the variable:

;to form the address of a variable ADDIL L'var-$global$+x,%dp

LDO R'var-$global$+x(%r1),tmp

;to load the contents of a variable ADDIL L'var-$global$+x,%dp

LDW R'var-$global$+x(%r1),tmp

These sequences must be converted to equivalent sequences using the linkage table pointer in %r19:

;to form the address of a variable

LDW T'var(%r19),tmp1

LDO

x(tmp1),tmp2

; omit if x == 0

;to load the contents of a variable

LDW T'var(%r19),tmp1

LDW x(tmp1),tmp2

Note that the T' fixup on the LDW instruction allows for a 14-bit signed offset, which restricts the DLT to be 16Kb. Because %r19 points to the middle of the DLT, we can take advantage of both positive and negative offsets. The T' fixup specifier should generate a DLT_REL fixup proceeded by an FSEL override fixup. If the FSEL override fixup is not generated, the linker assumes that the fixup mode is LD/RD for DLT_REL fixups. In order to support larger DLT table sizes, the following long form of the above data reference must be generated to reference tables that are larger. If the DLT table grows beyond the 16Kb limit, the linker emits an error indicating that the user must recompile using the +Z option which produces the following long-load sequences for data reference:

;form the address of a variable ADDIL LT'var,%r19

LDW RT'var(%r1),tmp1

LDO

x(tmp1),tmp2

; omit if x == 0

;load the contents of a variable ADDIL LT'var,%r19

LDW RT'var(%r1),tmp1

LDW x(tmp1),tmp2

Procedure Labels

The compilers already mark procedure label constructs so that the linker can process them properly. No changes are needed to the compilers.

Chapter 7

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Kenwood HP 9000 manual Global and Static Variable References, Procedure Labels
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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.
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