Commit Graph

9 Commits

Author SHA1 Message Date
Anton Kolesov d1dcdb8886 arc: Have nops in _exit_halt only for ARCompact
ARCompact processors (ARC 600 and ARC 700) require three "nop"s after the
"flag 1" instruction. Later ARC processors do not have this requirement, so
it is possible to reduce size of "_exit_halt" for them.

libgloss/
2016-05-24  Anton Kolesov  <Anton.Kolesov@synopsys.com>

	* arc/crt0.S (_exit_halt): Insert nops only for ARCompact.
2016-05-25 12:15:51 +02:00
Anton Kolesov dd00a8e719 arc: Rework default exception handlers for ARC EM and HS
Initially crt0.S used a special function, declared as weak as a default
exception handler in interrupt vector table. To let user override individual
handlers, this function had multiple names - one for each IVT entry, which,
however, was terribly confusing for the debugger and user - because it
wasn't clear which symbol will be used as a function name in debugger.
Defining multiple separate functions - one for each handler, would resolve
the mess, but would increase code size of crt0.o.

To clean this up, this patch defines exception handlers as weak symbols as
well, but those are defined as just symbols, not functions, hence there
would be less confusion over what is what. At the same time, users still can
redefine exception handlers symbol by creating functions with respective
names.

libgloss/
2016-05-24  Anton Kolesov  <Anton.Kolesov@synopsys.com>

	* arc/crt0.S: Convert memory_error and friends to non-function
	  symbols.
2016-05-25 12:15:51 +02:00
Jeff Johnston d1d1378d13 Fix libgloss arc nsim specs file. 2016-05-11 12:45:55 -04:00
Jeff Johnston 3312579f44 Fix libgloss/arc/nano.specs file. 2016-05-06 15:56:46 -04:00
Jeff Johnston 5c968d849a Fix white-space in libgloss/arc/Makefile.in. 2016-05-05 12:02:29 -04:00
Jeff Johnston 11afe8f6b6 Fix support ARC processors without barrel-shifter
crt0.S for ARC used to use instruction "asr.f lp_count, r3, 2" for all cores
except ARC601. However instructions which shift more than 1 bit are
optional, so this crt0.S didn't worked for all ARC cores.

Luckily this is a shift just by 2 bits on all occassions, so fix is trivial
- use two single-bit shifts.

libgloss/ChangeLog

2016-04-29  Anton Kolesov  <anton.kolesov@synopsys.com>

        * arc/crt0.S: Fix support for processors without barrel-shifter.

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
2016-05-02 12:04:40 -04:00
Jeff Johnston cd494f7038 Update crt0.S for ARC.
This is similar to commit 06537f05d4 to the
newlib for ARC.

GCC for ARC has been updated to provide consistent naming of preprocessor
definitions for different optional architecture features:

    * __ARC_BARREL_SHIFTER__ instead of __Xbarrel_shifter for
      -mbarrel-shifter
    * __ARCEM__ instead of __EM__ for ARC EM cores
    * __ARCHS__ instead of __HS__ for ARC HS cores
    * etc (not used in libgloss)

This patch updates crt0.S for ARC to use new definitions instead of a
deprecated ones. To ensure compatibility with older compiler new definitions
are also defined in crt0.S if needed, based on presence of deprecated
preprocessor definitions.

libgloss/ChangeLog

2016-04-29  Anton Kolesov  <Anton.Kolesov@synopsys.com>

        * arc/crt0.S: Use new GCC defines to detect processor features.
2016-05-02 11:58:47 -04:00
Jeff Johnston e90da68265 Add necessary infrastructure to support "nano" build of newlib.
ARC aproach to this feature is similiar to ARM's one here.

2016-04-29  Anton Kolesov  <anton.kolesov@synopsys.com>

        * arc/nano.specs: New file.
        * arc/Makefile.in: Support nano.specs.
        * arc/nsim.specs: Likewise.
2016-04-29 15:17:11 -04:00
Anton Kolesov acdfcb0a0a Add support for ARC to libgloss
ChangeLog:
2015-11-12  Anton Kolesov  <Anton.Kolesov@synopsys.com>

	* configure.in: Add ARC support to libgloss.
	* configure: Regenerate.

libgloss/ChangeLog:
2015-11-12  Anton Kolesov  <Anton.Kolesov@synopsys.com>

	* configure: Add ARC support.
	* configure.in: Likewise.
	* arc/Makefile.in: Likewise.
	* arc/aclocal.m4: Likewise.
	* arc/configure: Likewise.
	* arc/configure.in: Likewise.
	* arc/crt0.S: Likewise.
	* arc/libcfunc.c: Likewise.
	* arc/nsim-syscall.h: Likewise.
	* arc/nsim-syscalls.c: Likewise.
	* arc/nsim.specs: Likewise.
	* arc/sbrk.c: Likewise.
2015-11-12 14:11:47 +01:00