02-28-2007
Quote:
Here's the general technique employed by the pid provider: each traced instruciton is first replaced with a trapping instruction. On sparc we use a ta (trap always) and on x86 (by which I mean i386 and amd64) we use an int3 (0xcc) (see the fasttrap_tracepoint_install() function in usr/src/uts/sparc/dtrace/fasttrap_isa.c and usr/src/uts/intel/dtrace/fasttrap_isa.c).
from
this on sparc
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LEARN ABOUT OPENSOLARIS
u3b2
machid(1) User Commands machid(1)
NAME
machid, sun, iAPX286, i286, i386, i486, i860, pdp11, sparc, u3b, u3b2, u3b5, u3b15, vax, u370 - get processor type truth value
SYNOPSIS
sun
iAPX286
i386
pdp11
sparc
u3b
u3b2
u3b5
u3b15
vax
u370
DESCRIPTION
The following commands will return a true value (exit code of 0) if you are using an instruction set that the command name indicates.
sun True if you are on a Sun system.
iAPX286 True if you are on a computer using an iAPX286 processor.
i386 True if you are on a computer using an iAPX386 processor.
pdp11 True if you are on a PDP-11/45tm or PDP-11/70tm.
sparc True if you are on a computer using a SPARC-family processor.
u3b True if you are on a 3B20 computer.
u3b2 True if you are on a 3B2 computer.
u3b5 True if you are on a 3B5 computer.
u3b15 True if you are on a 3B15 computer.
vax True if you are on a VAX-11/750tm or VAX-11/780tm.
u370 True if you are on an IBM(R) System/370tm computer.
The commands that do not apply will return a false (non-zero) value. These commands are often used within makefiles (see make(1S)) and
shell scripts (see sh(1)) to increase portability.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
make(1S), sh(1), test(1), true(1), uname(1), attributes(5)
NOTES
The machid family of commands is obsolete. Use uname -p and uname -m instead.
SunOS 5.11 5 Jul 1990 machid(1)