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authorJoel Sherrill <joel.sherrill@OARcorp.com>2006-08-23 19:11:14 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>2006-08-23 19:11:14 +0000
commit83fb86f32b73942be758c22423c0bfe506fd4ff6 (patch)
treed51a136781eaccf67bfb2addfbe5330d9aed4791 /doc/supplements/arm/callconv.t
parent2006-08-23 Joel Sherrill <joel@OARcorp.com> (diff)
downloadrtems-83fb86f32b73942be758c22423c0bfe506fd4ff6.tar.bz2
2006-08-23 Joel Sherrill <joel@OARcorp.com>
* Makefile.am, configure.ac, FAQ/stamp-vti, FAQ/version.texi, common/cpright.texi: Merging CPU Supplements into a single document. As part of this removed the obsolete and impossible to maintain size and timing information. * cpu_supplement/.cvsignore, cpu_supplement/Makefile.am, cpu_supplement/arm.t, cpu_supplement/i386.t, cpu_supplement/m68k.t, cpu_supplement/mips.t, cpu_supplement/powerpc.t, cpu_supplement/preface.texi, cpu_supplement/sh.t, cpu_supplement/sparc.t, cpu_supplement/tic4x.t: New files. * supplements/.cvsignore, supplements/Makefile.am, supplements/supplement.am, supplements/arm/.cvsignore, supplements/arm/BSP_TIMES, supplements/arm/ChangeLog, supplements/arm/Makefile.am, supplements/arm/arm.texi, supplements/arm/bsp.t, supplements/arm/callconv.t, supplements/arm/cpumodel.t, supplements/arm/cputable.t, supplements/arm/fatalerr.t, supplements/arm/intr_NOTIMES.t, supplements/arm/memmodel.t, supplements/arm/preface.texi, supplements/arm/timeBSP.t, supplements/c4x/.cvsignore, supplements/c4x/BSP_TIMES, supplements/c4x/ChangeLog, supplements/c4x/Makefile.am, supplements/c4x/bsp.t, supplements/c4x/c4x.texi, supplements/c4x/callconv.t, supplements/c4x/cpumodel.t, supplements/c4x/cputable.t, supplements/c4x/fatalerr.t, supplements/c4x/intr_NOTIMES.t, supplements/c4x/memmodel.t, supplements/c4x/preface.texi, supplements/c4x/timeBSP.t, supplements/i386/.cvsignore, supplements/i386/ChangeLog, supplements/i386/FORCE386_TIMES, supplements/i386/Makefile.am, supplements/i386/bsp.t, supplements/i386/callconv.t, supplements/i386/cpumodel.t, supplements/i386/cputable.t, supplements/i386/fatalerr.t, supplements/i386/i386.texi, supplements/i386/intr_NOTIMES.t, supplements/i386/memmodel.t, supplements/i386/preface.texi, supplements/i386/timeFORCE386.t, supplements/m68k/.cvsignore, supplements/m68k/ChangeLog, supplements/m68k/MVME136_TIMES, supplements/m68k/Makefile.am, supplements/m68k/bsp.t, supplements/m68k/callconv.t, supplements/m68k/cpumodel.t, supplements/m68k/cputable.t, supplements/m68k/fatalerr.t, supplements/m68k/intr_NOTIMES.t, supplements/m68k/m68k.texi, supplements/m68k/memmodel.t, supplements/m68k/preface.texi, supplements/m68k/timeMVME136.t, supplements/m68k/timedata.t, supplements/mips/.cvsignore, supplements/mips/BSP_TIMES, supplements/mips/ChangeLog, supplements/mips/Makefile.am, supplements/mips/bsp.t, supplements/mips/callconv.t, supplements/mips/cpumodel.t, supplements/mips/cputable.t, supplements/mips/fatalerr.t, supplements/mips/intr_NOTIMES.t, supplements/mips/memmodel.t, supplements/mips/mips.texi, supplements/mips/preface.texi, supplements/mips/timeBSP.t, supplements/powerpc/.cvsignore, supplements/powerpc/ChangeLog, supplements/powerpc/DMV177_TIMES, supplements/powerpc/Makefile.am, supplements/powerpc/PSIM_TIMES, supplements/powerpc/bsp.t, supplements/powerpc/callconv.t, supplements/powerpc/cpumodel.t, supplements/powerpc/cputable.t, supplements/powerpc/fatalerr.t, supplements/powerpc/intr_NOTIMES.t, supplements/powerpc/memmodel.t, supplements/powerpc/powerpc.texi, supplements/powerpc/preface.texi, supplements/powerpc/timeDMV177.t, supplements/powerpc/timePSIM.t, supplements/sh/.cvsignore, supplements/sh/BSP_TIMES, supplements/sh/ChangeLog, supplements/sh/Makefile.am, supplements/sh/bsp.t, supplements/sh/callconv.t, supplements/sh/cpumodel.t, supplements/sh/cputable.t, supplements/sh/fatalerr.t, supplements/sh/intr_NOTIMES.t, supplements/sh/memmodel.t, supplements/sh/preface.texi, supplements/sh/sh.texi, supplements/sh/timeBSP.t, supplements/sparc/.cvsignore, supplements/sparc/ChangeLog, supplements/sparc/ERC32_TIMES, supplements/sparc/Makefile.am, supplements/sparc/bsp.t, supplements/sparc/callconv.t, supplements/sparc/cpumodel.t, supplements/sparc/cputable.t, supplements/sparc/fatalerr.t, supplements/sparc/intr_NOTIMES.t, supplements/sparc/memmodel.t, supplements/sparc/preface.texi, supplements/sparc/sparc.texi, supplements/sparc/timeERC32.t, supplements/template/.cvsignore, supplements/template/BSP_TIMES, supplements/template/ChangeLog, supplements/template/Makefile.am, supplements/template/bsp.t, supplements/template/callconv.t, supplements/template/cpumodel.t, supplements/template/cputable.t, supplements/template/fatalerr.t, supplements/template/intr_NOTIMES.t, supplements/template/memmodel.t, supplements/template/preface.texi, supplements/template/template.texi, supplements/template/timeBSP.t: Removed.
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-@c
-@c COPYRIGHT (c) 1988-2002.
-@c On-Line Applications Research Corporation (OAR).
-@c All rights reserved.
-@c
-@c $Id$
-@c
-
-@chapter Calling Conventions
-
-@section Introduction
-
-Each high-level language compiler generates
-subroutine entry and exit code based upon a set of rules known
-as the compiler's calling convention. These rules address the
-following issues:
-
-@itemize @bullet
-@item register preservation and usage
-@item parameter passing
-@item call and return mechanism
-@end itemize
-
-A compiler's calling convention is of importance when
-interfacing to subroutines written in another language either
-assembly or high-level. Even when the high-level language and
-target processor are the same, different compilers may use
-different calling conventions. As a result, calling conventions
-are both processor and compiler dependent.
-
-@section Processor Background
-
-The ARM architecture supports a simple yet
-effective call and return mechanism. A subroutine is invoked
-via the branch and link (@code{bl}) instruction. This instruction
-saves the return address in the @code{lr} register. Returning
-from a subroutine only requires that the return address be
-moved into the program counter (@code{pc}), possibly with
-an offset. It is is important to
-note that the @code{bl} instruction does not
-automatically save or restore any registers. It is the
-responsibility of the high-level language compiler to define the
-register preservation and usage convention.
-
-@section Calling Mechanism
-
-All RTEMS directives are invoked using the @code{bl}
-instruction and return to the user application via the
-mechanism described above.
-
-@section Register Usage
-
-As discussed above, the ARM's call and return mechanism dos
-not automatically save any registers. RTEMS uses the registers
-@code{r0}, @code{r1}, @code{r2}, and @code{r3} as scratch registers and
-per ARM calling convention, the @code{lr} register is altered
-as well. These registers are not preserved by RTEMS directives
-therefore, the contents of these registers should not be assumed
-upon return from any RTEMS directive.
-
-@section Parameter Passing
-
-RTEMS assumes that ARM calling conventions are followed and that
-the first four arguments are placed in registers @code{r0} through
-@code{r3}. If there are more arguments, than that, then they
-are place on the stack.
-
-@section User-Provided Routines
-
-All user-provided routines invoked by RTEMS, such as
-user extensions, device drivers, and MPCI routines, must also
-adhere to these calling conventions.
-