Linker Tasks

Using Linker commands

The base_prog, obj_files, and dest_file parameters are the same parameters supplied to alloc_load_space. The addr parameter is the address returned by alloc_load_space, and the entry_pt parameter specifies a symbol name that you want to act as the entry point in the module.

To dynamically link and load dest_file into base_prog, the dyn_load function performs these steps:

1.Dynamically link base_prog with obj_files, producing dest_file. The address at which dest_file will be loaded into memory is specified with the -Raddr option. The name of the entry point for the file is specified with -eentry_pt.

2.Open dest_file and get its header information on the text, data, and bss segments. Read this information into a som_exec_auxhdr structure, which starts immediately after a header structure.

3.Read the text and data segments into the area allocated by alloc_load_space. (The text and data segments are read separately.)

4.Initialize (fill with zeros) the bss, which starts immediately after the data segment.

5.Flush text from the data cache before execution, using the

flush_cache routine. (See “The flush_cache Function” later in this chapter.)

6.Return a pointer to the entry point, specified by the -eoption in Step 1.

C Source for dyn_load Function

void * dyn_load(const char * base_prog, unsigned int addr,

const char * obj_files, const char * dest_file, const char * entry_pt)

{

 

 

 

char

cmd_buf[256];

/* buffer holding linker command

 

*/

 

 

 

int

ret_val;

/* holds return value of library calls

 

*/

 

 

 

FILE

* destfp;

/* file pointer for destination file

 

*/

 

 

 

unsigned int bss_start;

/* start address of bss in VM

 

*/

 

 

 

unsigned int bss_size;

/* size of bss

*/

unsigned int entry_pt_addr; /* address of entry point

Chapter 3

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Kenwood HP 9000 manual Source for dynload Function, File
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HP 9000 specifications

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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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