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MPLAB ? C32 C COMPILER
USER ’S GUIDE
Chapter 5. Compiler Runtime Environment
5.1
5.2
INTRODUCTION
This chapter discusses the MPLAB C32 C compiler runtime environment.
HIGHLIGHTS
Items discussed in this chapter are:
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5.3
REGISTER CONVENTIONS
TABLE 5-1:
REGISTER CONVENTIONS
Register Name
$0
$1
$2-$3
$4-$7
$8-$15
$16-$23
$24-$25
$26-$27
$28
$29
$30
$31
? 2007 Microchip Technology Inc.
Software Name
zero
at
v0-v1
a0-a3
t0-t7
s0-s7
t8-t9
k0-k1
gp
sp
fp or s8
ra
Use
Always 0 when read.
Assembler temporary variable.
Return value from functions.
Used for passing arguments to functions.
Temporary registers used by compiler for expression
evaluation. Values not saved across function calls.
Temporary registers whose values are saved across
function calls.
Temporary registers used by compiler for expression
evaluation. Values not saved across function calls.
Reserved for interrupt/trap handler.
Global pointer.
Stack Pointer.
Frame Pointer if needed. Additional temporary saved
register if not.
Return address for functions.
DS51686A-page 57
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相关PDF资料
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
SY87729LHI-EVAL
BOARD EVAL N SY87729 EXPERIMENT
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