Debug Manual

Using Debug on TNS/R Processors
Debug Manual—421921-003
2-14
TNS and TNS/R Register Correspondence
$23 $S7 Saved variables PX. Extended address
in user space of next
TNS instruction half
word in current TNS
code segment
R7
$24 $T8 Temporary UC_CSeg. User code
segment as an
extended 32-bit address
UC_Cseg. User
code segment as
an extended 32-bit
address
$25 $T9 Temporary ENV. Environment
register in stack-marker
format
ENV.
Environment
register in stack-
marker format
$26, $27 $K0, $K1 Reserved for
kernel
Reserved for kernel --
$28 $GP Global pointer RMap. Extended
address of current TNS
code segment’s return
map
RMap. Extended
address of
current TNS code
segment’s return
map
$29 $SP Stack pointer SX. S register value as
an extended 32-bit
address
SX. S register
value as an
extended 32-bit
address
$30 $S8/$FP Saved variables LX. L register value as
an extended 32-bit
address
LX. L register
value as an
extended 32-bit
address
$31 $RA Return address Temporary Temporary
$F00..$F31 When floating-
point instructions
have been used.
$F00 through
$F19 are
temporary
registers and
$F20 through
$F31 are saved
registers.
$FCR31 When floating-
point instructions
have been used
Table 2-2. TNS/R Register Use Summary (page 2 of 2)
Register Alias
Native
Execution
Mode TNS Execution Mode
Accelerated
Execution Mode