NOTE

Position-Independent Code

Generating Position-Independent Code

Generating Position-Independent Code

To be position-independent, object code must restrict all references to code and data to either PC-relative or indirect references, where all indirect references are collected in a single linkage table that can be initialized on a per-process basis by dld.sl.

Register 19 (%r19) is the designated pointer to the linkage table. The linker generates stubs that ensure %r19 always points to the correct value for the target routine and that handle the inter-space calls needed to branch between shared libraries.

The linker generates an import stub for each external reference to a routine. The call to the routine is redirected to branch to the import stub, which obtains the target routine address and the new linkage table pointer value from the current linkage table; it then branches to an export stub for the target routine. In 32-bit mode, the linker generates an export stub for each externally visible routine in a shared library or program file. The export stub is responsible for trapping the return from the target routine in order to handle the inter-space call required between shared libraries and program files.

The 64-bit mode linker does not require or support export stubs.

Shown below is the PIC code generated for import and export stubs. Note that this code is generated automatically by the linker; you don't have to generate the stubs yourself.

;Import Stub (Incomplete

Executable)

X':

ADDIL

L'lt_ptr+ltoff,%dp

; get procedure entry point

 

LDW

R'lt_ptr+ltoff(%r1),%r21

 

LDW

R'lt_ptr+ltoff+4(%r1),%r19 ; get new r19 value.

 

LDSID

(%r21),%r1

 

 

 

MTSP

%r1,%sr0

 

 

 

BE

0(%sr0,%r21)

; branch to target

 

STW

%rp,-24(%sp)

; save rp

;Import Stub (Shared Library)

 

X':

ADDIL

L'ltoff,%r19

; get procedure entry point

 

LDW

R'ltoff(%r1),%r21

 

 

LDW

R'ltoff+4(%r1),%r19

; get new r19 value

 

LDSID

(%r21),%r1

 

 

 

MTSP

%r1,%sr0

 

 

 

BE

0(%sr0,%r21)

; branch to target

 

STW

%rp,-24(%sp)

; save rp

;Export Stub (Shared libs and Incomplete Executables)

X':

BL,N

X,%rp ; trap

the return

Chapter 7

263

Page 262 Page 264
Page 263
Image 263
Kenwood HP 9000 manual Generating Position-Independent Code
Page 262 Page 264

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.
Top Page Image Contents