4.9.47 Psect Directive
The PSECT directive declares or resumes a program
section.
The directive takes as argument a name and, optionally, a comma-separated list of flags. The allowed flags specify attributes of the psect. They are listed in the Table 4-10 table.
The psect name is in a separate name space to ordinary assembly symbols, so a psect can use the same identifier as an ordinary assembly identifier. However, a psect name cannot be one of the assembler directives, keywords, or psect flags.
Once a psect has been declared, it can be resumed later by another
PSECT directive; however, the flags need not be repeated and will be
propagated from the earlier declaration. An error is generated if two
PSECT directives for the same psect are encountered with contradictory
flags, the exceptions being that the reloc, size and
limit flags can be respecified without error.
| Flag | Meaning |
|---|---|
abs |
psect is absolute. |
bit |
psect holds bit objects. |
class=name |
Specify class name for psect. |
delta=size |
Size of an addressing unit. |
global |
psect is global (default). |
inline |
psect contents (function) can be inlined when called. |
keep |
psect will not be deleted after inlining. |
limit=address |
Upper address limit of psect (PIC18 only). |
local |
psect is unique and will not link with others having the same name. |
lowdata |
psect will be entirely located below the 0x1000 address. |
merge=allow |
Allow or prevent merging of this psect. |
noexec |
For debugging purposes, this psect contains no executable code. |
note |
psect does not contain any data that should appear in the program image. |
optim=optimizations |
specify optimizations allowable with this psect. |
ovrld |
psect will overlap same psect in other modules. |
pure |
psect is to be read-only. |
reloc=boundary |
Start psect on specified boundary. |
size=max |
Maximum size of psect. |
space=area |
Represents area in which psect will reside. |
split=allow |
Allow or prevent splitting of this psect. |
with=psect |
Place psect in the same page as specified psect. |
Some examples of the use of the PSECT directive
follow:
; swap output to the psect called fred
PSECT fred
; swap to the psect bill, which has a maximum size of 100 bytes and which is global
PSECT bill,size=100h,global
; swap to joh, which is an absolute and overlaid psect that is part of the CODE linker class,
; and whose content has a 2-byte word at each address
PSECT joh,abs,ovrld,class=CODE,delta=2