src-test2/sys/libkern/mcount.c, branch stable/10

Unbreak high resolution profiling a little: use dummy asms to prevent

2007-06-13T06:17:48Z

timing loops being optimized away. Once apon a time, gcc promised not to optimize away timing loops, but gcc started optimizing away the call to a null function in the timing loop here some time between gcc-3.3.3 and gcc-3.4.6, and it started optimizing away the timing loop itself some time between gcc-3.4.6 and gcc-4.2.

Move the kernel-specific logic to adjust frompc from MI to MD. For

2004-08-27T19:42:35Z

these two reasons: 1. On ia64 a function pointer does not hold the address of the first instruction of a functions implementation. It holds the address of a function descriptor. Hence the user(), btrap(), eintr() and bintr() prototypes are wrong for getting the actual code address. 2. The logic forces interrupt, trap and exception entry points to be layed-out contiguously. This can not be achieved on ia64 and is generally just bad programming. The MCOUNT_FROMPC_USER macro is used to set the frompc argument to some kernel address which represents any frompc that falls outside the kernel text range. The macro can expand to ~0U to bail out in that case. The MCOUNT_FROMPC_INTR macro is used to set the frompc argument to some kernel address to represent a call to a trap or interrupt handler. This to avoid that the trap or interrupt handler appear to be called from everywhere in the call graph. The macro can expand to ~0U to prevent adjusting frompc. Note that the argument is selfpc, not frompc. This commit defines the macros on all architectures equivalently to the original code in sys/libkern/mcount.c. People can take it from here... Compile-tested on: alpha, amd64, i386, ia64 and sparc64 Boot-tested on: i386

Remove advertising clause from University of California Regent's

2004-04-07T20:46:16Z

license, per letter dated July 22, 1999 and email from Peter Wemm, Alan Cox and Robert Watson. Approved by: core, peter, alc, rwatson

Use __FBSDID().

2003-06-11T05:37:42Z

Remove __P.

2002-03-20T02:15:46Z

We do not have UPAGES following the tail end of the user VM space anymore.

2001-08-08T04:02:22Z

RIP .

2001-02-11T10:44:09Z

Some things needed bits of - cy.c now has its own (only) copy of the COM_(UN)LOCK() macros, and IMASK_(UN)LOCK() has been moved to (AKA ). Reviewed by: jhb

Fix compilation of profiled kernels by including

2000-10-14T08:34:27Z

Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"

1999-12-29T05:07:58Z

is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.

$Id$ -> $FreeBSD$

1999-08-28T01:08:13Z