disassembler(3) — Subroutines
NAME
disassembler − disassemble a machine instruction and print the results
SYNOPSIS
int disassembler (iadr, regstyle, get_symname, get_regvalue, \
get_bytes, print_header)
unsigned long iadr;
int regstyle;
char ∗(∗get_symname)();
int (∗get_regvalue)();
long (∗get_bytes)();
void (∗print_header)();
The backslash (\) indicates line continuation and need not be included in actual use.
DESCRIPTION
The disassembler disassembles and prints a machine instruction on stdout.
Iadr is the instruction address to be disassembled. Regstyle specifies how registers are named in the disassembly; if the value is 0, 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. Get_bytes is called with no arguments and returns the next byte(s) to disassemble.
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 disassembler 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. disassembler 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. Print_header can use these parameters to print any desired information 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.
The program must be loaded with the object file access routine library libmld.a.