Commit Graph

58 Commits

Author SHA1 Message Date
Bruce M Simpson
abd498aa71 Add the mlockall() and munlockall() system calls.
- All those diffs to syscalls.master for each architecture *are*
   necessary. This needed clarification; the stub code generation for
   mlockall() was disabled, which would prevent applications from
   linking to this API (suggested by mux)
 - Giant has been quoshed. It is no longer held by the code, as
   the required locking has been pushed down within vm_map.c.
 - Callers must specify VM_MAP_WIRE_HOLESOK or VM_MAP_WIRE_NOHOLES
   to express their intention explicitly.
 - Inspected at the vmstat, top and vm pager sysctl stats level.
   Paging-in activity is occurring correctly, using a test harness.
 - The RES size for a process may appear to be greater than its SIZE.
   This is believed to be due to mappings of the same shared library
   page being wired twice. Further exploration is needed.
 - Believed to back out of allocations and locks correctly
   (tested with WITNESS, MUTEX_PROFILING, INVARIANTS and DIAGNOSTIC).

PR:             kern/43426, standards/54223
Reviewed by:    jake, alc
Approved by:    jake (mentor)
MFC after:	2 weeks
2003-08-11 07:14:08 +00:00
Marcel Moolenaar
03bab8d60f o There are 6 trap disable bits in ar.fpsr, not five. Even though we
didn't provide a constant for one of them (non-IEEE denormal trap),
  in an attempt to not support it probably, it's not we are left with
  the lower 5 bits.
o Properly mask the passed or returned fp_except_t. Not doing so
  causes instant core dumps by trying to write an invalid value to
  ar.fpsr. Now that we're masking, stop using exclusive-or to invert
  bits.

This fixes the illegal instruction fault encountered when building
mozilla.
2003-08-09 17:07:24 +00:00
Marcel Moolenaar
8955f59879 Override the default stubs for getcontext(2) and swapcontext(2) so
that we can flush the register stack prior to entering the kernel.
This avoids having dirty registers and saves us from having to
manually write them to the backing store from within the kernel.
In that respect, flushing the RSE is both functionally required as
well as performance optimal.

On average we had 18 dirty registers when getcontext(2) was called
from libthr. Since libthr does not switch back to a context created
by getcontext(2), not having dealt with the dirty registers was
harmless.
2003-08-02 00:49:36 +00:00
Marcel Moolenaar
6e9a9b9f52 The END() must expand to the .endp directive with the same name as
on the corresponding .proc directive, or the .endp must not have a
name at all.
While here, remove an artificial dependency in Ovfork.S by performing
manual register renaming.
2003-08-01 22:17:12 +00:00
Marcel Moolenaar
938b878e45 Revert previous commit. We don't use setjmp()/longjmp() for context
switching anymore, so there's no need to save and restore GP. This
change breaks threaded applications linked against libc_r. Pull the
tier 2 card again: relink. This will link against libthr instead.
2003-07-25 22:36:48 +00:00
Marcel Moolenaar
ec5f6d191d Implement signalcontext(). Needed by libpthread (aka libkse). 2003-06-24 05:06:42 +00:00
Marcel Moolenaar
75fa7db991 o Fix a cut-n-paste bug. We were clobbering rp with gp...
o  Make sure the arguments to ctx_wrapper() are loaded from the
   backing store by forcing an underflow. Do this by making all
   registers in the register frame local.
2003-06-02 00:16:39 +00:00
Marcel Moolenaar
fae3c3b7eb Rough implement of makecontext() needed to support libthr.
o  Up to 8 arguments are allowed. This is the number of arguments
   passed in registers. Subsequent registers are passed on the stack.
   Trying to deal with this is not easy in C and likely forces us to
   use assembly code. Let's avoid that for now. There's no indication
   that more than 8 arguments is a strong requirement (Linux also has
   an 8 argument limit).
o  We expect that the stack base is 16-byte aligned and the stack
   size is a multiple of 16-byte. We bomb out if this is not the case.
   We probably want to be less strict by enforcing it ourselves. For
   now it's better to not hide gross alignment bogons by silently
   correcting it.
2003-05-31 19:42:51 +00:00
Marcel Moolenaar
f2c49dd248 Revamp of the syscall path, exception and context handling. The
prime objectives are:
o  Implement a syscall path based on the epc inststruction (see
   sys/ia64/ia64/syscall.s).
o  Revisit the places were we need to save and restore registers
   and define those contexts in terms of the register sets (see
   sys/ia64/include/_regset.h).

Secundairy objectives:
o  Remove the requirement to use contigmalloc for kernel stacks.
o  Better handling of the high FP registers for SMP systems.
o  Switch to the new cpu_switch() and cpu_throw() semantics.
o  Add a good unwinder to reconstruct contexts for the rare
   cases we need to (see sys/contrib/ia64/libuwx)

Many files are affected by this change. Functionally it boils
down to:
o  The EPC syscall doesn't preserve registers it does not need
   to preserve and places the arguments differently on the stack.
   This affects libc and truss.
o  The address of the kernel page directory (kptdir) had to
   be unstaticized for use by the nested TLB fault handler.
   The name has been changed to ia64_kptdir to avoid conflicts.
   The renaming affects libkvm.
o  The trapframe only contains the special registers and the
   scratch registers. For syscalls using the EPC syscall path
   no scratch registers are saved. This affects all places where
   the trapframe is accessed. Most notably the unaligned access
   handler, the signal delivery code and the debugger.
o  Context switching only partly saves the special registers
   and the preserved registers. This affects cpu_switch() and
   triggered the move to the new semantics, which additionally
   affects cpu_throw().
o  The high FP registers are either in the PCB or on some
   CPU. context switching for them is done lazily. This affects
   trap().
o  The mcontext has room for all registers, but not all of them
   have to be defined in all cases. This mostly affects signal
   delivery code now. The *context syscalls are as of yet still
   unimplemented.

Many details went into the removal of the requirement to use
contigmalloc for kernel stacks. The details are mostly CPU
specific and limited to exception_save() and exception_restore().
The few places where we create, destroy or switch stacks were
mostly simplified by not having to construct physical addresses
and additionally saving the virtual addresses for later use.

Besides more efficient context saving and restoring, which of
course yields a noticable speedup, this also fixes the dreaded
SMP bootup problem as a side-effect. The details of which are
still not fully understood.

This change includes all the necessary backward compatibility
code to have it handle older userland binaries that use the
break instruction for syscalls. Support for break-based syscalls
has been pessimized in favor of a clean implementation. Due to
the overall better performance of the kernel, this will still
be notived as an improvement if it's noticed at all.

Approved by: re@ (jhb)
2003-05-16 21:26:42 +00:00
David Schultz
b7412bf571 Add a comment describing why it's important for the values in this
file to be correct, and how to generate them automatically.

Caused much pain and suffering for:	peter
2003-05-08 13:50:44 +00:00
David Schultz
92b93b37c0 Add __ldtoa(), a wrapper around gdtoa() to make it look like dtoa().
In support of this, add some MD macros to assist in converting long
doubles to the format expected by gdtoa().

Reviewed by:	silence on standards@
2003-04-05 22:10:13 +00:00
David Schultz
6a66acb565 Replace our ancient dtoa/strtod implementation with the gdtoa
package, a more recent, generalized set of routines.  Among the
changes:
- Declare strtof() and strtold() in stdlib.h.
- Add glue to libc to support these routines for all kinds
  of ``long double''.
- Update printf() to reflect the fact that dtoa works slightly
  differently now.

As soon as I see that nothing has blown up, I will kill
src/lib/libc/stdlib/strtod.c.  Soon printf() will be able
to use the new routines to output long doubles without loss
of precision, but numerous bugs in the existing code must
be addressed first.

Reviewed by:	bde (briefly), mike (mentor), obrien
2003-03-12 20:30:00 +00:00
Marcel Moolenaar
cafd6dbd76 Fix threaded applications on ia64 that are linked dynamicly. We did
not save (restore) the global pointer (GP) in the jmpbuf in setjmp
(longjmp) because it's not needed in general. GP is considered a
scratch register at callsites and hence is always restored after a
call (when it's possible that the call resolves to a symbol in a
different loadmodule; otherwise GP does not have to be saved and
restored at all), including calls to setjmp/longjmp. There's just
one problem with this now that we use setjmp/longjmp for context
switching: A new context must have GP defined properly for the
thread's entry point. This means that we need to put GP in the
jmpbuf and consequently that we have to restore is in longjmp.
This automaticly requires us to save it as well.

When setjmp/longjmp isn't used for context switching, this can be
reverted again.
2003-03-05 04:39:24 +00:00
Marcel Moolenaar
a402169a8e ABI breaker: Move the J_SIGMASK field in the jmpbuf before
the J_SIG0 field. While here, rename J_SIG0 to J_SIGSET and
remove J_SIG1. The main reason for this change is that the
128-bit sigset_t is now aligned on a 16-byte boundary, which
allows us to use 16-byte atomic loads and stores on CPUs that
support it. The removal of J_SIG1 is done to avoid confusion:
it is never accessed and should not be. Renaming J_SIG0 to
J_SIGSET is the icing on the cake that's better done now than
later.
2003-03-05 03:30:54 +00:00
David E. O'Brien
9c904fcdbc Use __FBSDID. 2003-03-03 01:09:46 +00:00
Mike Barcroft
ef4a12d2d7 ia64 actually uses 80-bit long doubles and must support big and little
endian at compile-time.

Reviewed by:	das
2003-02-26 16:04:34 +00:00
Mike Barcroft
5d62092f94 o Implement C99 classification macros isfinite(), isinf(), isnan(),
isnormal().  The current isinf() and isnan() are perserved for
  binary compatibility with 5.0, but new programs will use the macros.
o Implement C99 comparison macros isgreater(), isgreaterequal(),
  isless(), islessequal(), islessgreater(), isunordered().

Submitted by:	David Schultz <dschultz@uclink.Berkeley.EDU>
2003-02-12 20:03:41 +00:00
Mike Barcroft
8cf5ed5125 Implement fpclassify():
o Add a MD header private to libc called _fpmath.h; this header
  contains bitfield layouts of MD floating-point types.
o Add a MI header private to libc called fpmath.h; this header
  contains bitfield layouts of MI floating-point types.
o Add private libc variables to lib/libc/$arch/gen/infinity.c for
  storing NaN values.
o Add __double_t and __float_t to <machine/_types.h>, and provide
  double_t and float_t typedefs in <math.h>.
o Add some C99 manifest constants (FP_ILOGB0, FP_ILOGBNAN, HUGE_VALF,
  HUGE_VALL, INFINITY, NAN, and return values for fpclassify()) to
  <math.h> and others (FLT_EVAL_METHOD, DECIMAL_DIG) to <float.h> via
  <machine/float.h>.
o Add C99 macro fpclassify() which calls __fpclassify{d,f,l}() based
  on the size of its argument.  __fpclassifyl() is never called on
  alpha because (sizeof(long double) == sizeof(double)), which is good
  since __fpclassifyl() can't deal with such a small `long double'.

This was developed by David Schultz and myself with input from bde and
fenner.

PR:		23103
Submitted by:	David Schultz <dschultz@uclink.Berkeley.EDU>
		(significant portions)
Reviewed by:	bde, fenner (earlier versions)
2003-02-08 20:37:55 +00:00
Marcel Moolenaar
42cf585a69 Implement missing fpgetround() and fpsetround(). 2003-01-11 07:24:54 +00:00
Jens Schweikhardt
9d5abbddbf Correct typos, mostly s/ a / an / where appropriate. Some whitespace cleanup,
especially in troff files.
2003-01-01 18:49:04 +00:00
Marcel Moolenaar
fef38f259f Sort SRCS. 2002-11-16 01:41:33 +00:00
Marcel Moolenaar
122dd01309 o Fix _longjmp() to return 1 when the return value is given as 0.
o  Remove the unwanted smartness in _longjmp() where it compares
   the current ar.bspstore with the saved ar.bspstore and restores
   ar.rnat based on it. This either avoids saving ar.rnat in the
   jmp_buf or is the consequence of not saving ar.rnat. All this
   complexity breaks libc_r where we use longjmp() to switch to
   different threads and the current ar.bspstore has no relation
   to the saved ar.bspstore. Thus: we save ar.rnat in setjmp()
   and simply restore ar.bspstore and ar.rnat in longjmp().

This code needs a cleanup.
2002-11-14 06:40:23 +00:00
Marcel Moolenaar
7aa65edc75 ia64 ABI breaker:
Don't force 16-byte alignment at run-time. Do it at compile-time.
This saves us the pointer fiddling by the setjmp functions and
reduces complexity. While here, increase the jmp_buf by 16 bytes
to an even 512 bytes. Coincidentally, due to the way alignment
was handled prior to this change, the jmp_buf has not changed in
size, but only in how the space is used. Prior to this change
the 16 bytes were reserved for enforcing alignment; now they are
reserved by us for future extensions.
Therefore, this ABI breaker is relatively save: the failure is
always an alignment trap.
2002-11-11 08:11:44 +00:00
Archie Cobbs
83999f5a32 Re-apply the previously backed-out commit that fixes the problem where
HUGE_VAL is not properly aligned on some architectures. The previous
fix now works because the two versions of 'math.h' (include/math.h
and lib/msun/src/math.h) have since been merged into one.

PR:	bin/43544
2002-10-31 23:05:20 +00:00
Archie Cobbs
ae8a4b2f36 Revert previous commit to unbreak world until we figure out the
right way to do it.
2002-09-20 15:43:26 +00:00
Archie Cobbs
f5f1272284 Fix a problem with the definition of HUGE_VAL causing the gcc warning
"cast increases required alignment of target type" on some platforms.

Reviewed by:	bde
2002-09-19 19:47:27 +00:00
Marcel Moolenaar
31582c4e81 We cannot use an alloc with only inputs and/or locals. The kernel
assumes that the parameters are passed in output registers. Remove
the alloc entirely, but don't depend on the kernel not trashing
our registers.
2002-08-23 03:47:50 +00:00
Jake Burkholder
530622075e Generate the normal asm stubs for all sysv system calls. Use these instead
of C wrappers for the *sys indirect system calls.  The indirect system calls
are horribly broken on sparc64.

Submitted by:	tmm
2002-05-23 23:51:57 +00:00
David E. O'Brien
c027737942 Our default syscall.S is identical to what was explicitly being done for
Alpha and IA-64.  So there is no need for special handling.
2002-05-15 21:17:59 +00:00
Marcel Moolenaar
2d631dd6fa Implement _Unwind_FindTableEntry(). This function is part of GCC
for some configurations, but not for FreeBSD (yet?). Have one in
libc in the mean time.
2002-04-13 04:06:34 +00:00
David E. O'Brien
1114a754ed Fix the style of the SCM ID's.
I believe have made all of libc .h's as consistent as possible.
2002-03-22 23:42:05 +00:00
David E. O'Brien
333fc21e3c Fix the style of the SCM ID's.
I believe have made all of libc .c's as consistent as possible.
2002-03-22 21:53:29 +00:00
David E. O'Brien
8fb3f3f682 Remove 'register' keyword. 2002-03-21 18:49:23 +00:00
Mike Barcroft
fd8e4ebc8c o Move NTOHL() and associated macros into <sys/param.h>. These are
deprecated in favor of the POSIX-defined lowercase variants.
o Change all occurrences of NTOHL() and associated marcros in the
  source tree to use the lowercase function variants.
o Add missing license bits to sparc64's <machine/endian.h>.
  Approved by: jake
o Clean up <machine/endian.h> files.
o Remove unused __uint16_swap_uint32() from i386's <machine/endian.h>.
o Remove prototypes for non-existent bswapXX() functions.
o Include <machine/endian.h> in <arpa/inet.h> to define the
  POSIX-required ntohl() family of functions.
o Do similar things to expose the ntohl() family in libstand, <netinet/in.h>,
  and <sys/param.h>.
o Prepend underscores to the ntohl() family to help deal with
  complexities associated with having MD (asm and inline) versions, and
  having to prevent exposure of these functions in other headers that
  happen to make use of endian-specific defines.
o Create weak aliases to the canonical function name to help deal with
  third-party software forgetting to include an appropriate header.
o Remove some now unneeded pollution from <sys/types.h>.
o Add missing <arpa/inet.h> includes in userland.

Tested on:	alpha, i386
Reviewed by:	bde, jake, tmm
2002-02-18 20:35:27 +00:00
Doug Rabson
9639b6892e Implement fpsetmask() and fpgetmask(). 2001-11-03 15:52:18 +00:00
Doug Rabson
fc5ccf726e Compensate for the way that _setjmp aligns the start of jmp_buf. 2001-10-26 08:26:45 +00:00
Peter Wemm
b389f073af Fix WAW dependency. p6 is written in the syscall epilogue. 2001-10-22 09:17:14 +00:00
Doug Rabson
694725c201 Fix a few more dependancy violations. 2001-10-22 08:48:11 +00:00
Doug Rabson
61415ba82c Implement setjmp, longjmp, sigsetjmp and siglongjmp. 2001-10-20 15:19:08 +00:00
Doug Rabson
9466885ca4 Add __divdf3(), __divsf3() and __infinity[].
Obtained from:	Intel (for the divide code)
2001-10-20 15:17:31 +00:00
Doug Rabson
d9ed7b41fe Adjust so that we don't use relocations which can't exist in a shared
library.
2001-10-10 10:35:01 +00:00
Doug Rabson
d7ed89186f Shorter versions of the byte swapping code. 2001-10-10 10:34:08 +00:00
Doug Rabson
3e2c3ee97c Fix a load of dependancy violations. 2001-10-05 18:52:42 +00:00
Doug Rabson
1e1a0298ee Fix a whole bunch of dependancy bugs and make it actually work when the
size is not a multiple of eight.
2001-09-22 18:27:01 +00:00
Doug Rabson
f422e65a5d Fix byte swapping - it was totally broken. 2001-09-22 18:22:53 +00:00
Doug Rabson
8dc609a914 Implement _setjmp()/_longjmp().
Obtained from: Intel's EFI toolkit
2001-09-04 08:27:39 +00:00
Ruslan Ermilov
8af1452cf8 Removed duplicate VCS ID tags, as per style(9). 2001-08-13 14:06:34 +00:00
Doug Rabson
ac9a4fc876 Use relative paths to find byte_swap_*.S to make it easier to use these
from libstand.
2001-03-06 16:08:19 +00:00
Doug Rabson
5e1202d5d3 Make this compile. Still need to write/borrow a working setjmp. 2001-03-06 16:07:41 +00:00
David E. O'Brien
de3ac4d068 Correct a comment. 2001-03-05 10:00:57 +00:00