Avago Technologies LSI53C1010 - Manual (Page 176)

7-10 Integrating SCRIPTS Programs into “C” Language Drivers
first Dword along with the opcode, be sure to OR in the byte count
instead of doing a straight assignment. Byte counts to be patched are
usually defined as EXTERNS, RELATIVES, or ABSOLUTES. The
general format of this type of patch is:
SCRIPT[X_bytecount_Used[n]] |= c_byte_count;
Where X is either E, R, or A
n is the nth occurrence of this byte count in the SCRIPTS program.
c_byte_count is a variable/constant byte count value.
See Chapter 5, “The NASM Output File,” for more information on the
_Used array.
7.2.6 Absolute JUMP/CALL Addresses
Use the LABELPATCHES array to patch in absolute JUMP or CALL
addresses. The absolute offset from the beginning of the SCRIPTS
instruction is encoded in the JUMP instruction at assembly. All that needs
to be added is the base physical address of the SCRIPTS array. The
general format of this type of patch is:
SCRIPT[LABELPATCHES[n]] += VirttoPhys(SCRIPT);
Where n is the nth jump instruction to be patched.
This can be automated using a loop and the PATCHES values.
See Chapter 5, “The NASM Output File,” for more information on the
LABELPATCHES array.
7.2.7 Entry Locations
Entry offsets are byte offsets, not Dword offsets. Divide the Entry offset
by 4 to get to a SCRIPTS instruction offset. This method can be used to
modify any SCRIPTS instruction that normally does not need patching,
but needs to be modified in a special circumstance. The general format
of this type of patch is:
SCRIPT[Ent_entrylabel/4 + n] = value;
Where n is either 0, 1 or 2 depending on the particular Dword of the
instruction that needs to be accessed.