06-15-2011
Quote:
Originally Posted by
theKbStockpiler
Why emulate the CPU if you have the instruction set?
It's been found useful to break up one big server into many smaller, virtual ones. When you hear the term "virtual server" this is what they're talking about, a virtual environment inside a bigger server in which you can install pretty much whatever OS and software you want. Sometimes the host OS supports virtual environments natively, or it can be done through software like Qemu and VMware. Hardware virtualization has made this reasonably efficient now, but if they had to actually
emulate all these environments instruction by instruction? It wouldn't be practical.
Quote:
The data structure is Really the Emulated CPU is it not?
Data is registers; they just sit there. The
program has to decide what to do to them. In a real CPU, this would be decided in hardware. In a software emulator, it has to do it 'by hand' as it were, decoding which instruction it is with binary logic operations and finding it in a big look-up table or something, then doing operations on the "registers" as appropriate.
Quote:
The emulated CPU would be imaginary besides for its reprentation in a file the emulator would address so I could have registers of how many and what size I could dream up could I not?
Absolutely. I was just talking about optimization.
Last edited by Corona688; 06-15-2011 at 01:25 PM..
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT ULTRIX
disassembler
disassembler(3x) disassembler(3x)
Name
disassembler - disassemble a MIPS instruction and print the results
Syntax
int disassembler (iadr, regstyle, get_symname, get_regvalue, get_bytes, print_header)
unsigned iadr;
int regstyle;
char *(*get_symname)();
int (*get_regvalue)();
long (*get_bytes)();
void (*print_header)();
Description
The disassembler function disassembles and prints a MIPS machine instruction on stdout.
The argument is the instruction address to be disassembled. The regstyle parameter specifies how registers are named in the disassembly.
The value is 0 if compiler names are used; otherwise, hardware names are used.
The next four arguments are function pointers, most of which give the caller some flexibility in the appearance of the disassembly. The
only function that must be provided is get_bytes. All other functions are optional. The get_bytes function is called without arguments
and returns the next byte or bytes to disassemble.
The get_symname is passed an address, which is the target of a jal instruction. If null is returned or if get_symname is null the disassem-
bler prints the address; otherwise, the string name is printed as returned from get_symname. If get_regvalue is not null, it is passed a
register number and returns the current contents of the specified register. The disassembler function prints this information along with
the instruction disassembly. If print_header is not null, it is passed the instruction address, iadr, and the current instruction to be
disassembled, which is the return value from get_bytes. The print_header function can use these parameters to print any desired informa-
tion before the actual instruction disassembly is printed.
If get_bytes is null, the disassembler returns -1 and errno is set to EINVAL; otherwise, the number of bytes that were disassembled is
returned. If the disassembled word is a jump or branch instruction, the instruction in the delay slot is also disassembled.
See Also
ldfcn(5)
RISC disassembler(3x)