From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/config/m32c/m32c.abi | 132 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 132 insertions(+) create mode 100644 gcc/config/m32c/m32c.abi (limited to 'gcc/config/m32c/m32c.abi') diff --git a/gcc/config/m32c/m32c.abi b/gcc/config/m32c/m32c.abi new file mode 100644 index 000000000..ee8324028 --- /dev/null +++ b/gcc/config/m32c/m32c.abi @@ -0,0 +1,132 @@ + Target Definitions for R8C/M16C/M32C + Copyright (C) 2005, 2007 + Free Software Foundation, Inc. + Contributed by Red Hat. + + This file is part of GCC. + + GCC is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 3, or (at your + option) any later version. + + GCC is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public + License for more details. + + You should have received a copy of the GNU General Public License + along with GCC; see the file COPYING3. If not see + . + + +These are just some random notes I used during development of this +port. Please don't consider these to be "official" specifications, +just additional information to help make the code easier to +understand. + + +Frame +===== + + +-------------------- + | incoming args + +-------------------- + | return Address +osp -> +-------------------- + | saved fp +fp -> +-------------------- + | local data + +-------------------- + | saved regs + +-------------------- + | outgoing args (opt) +sp -> +-------------------- + +Argument Passing +================ + +r8c, m16c +--------- + +First arg may be passed in r1l or r1 if it (1) fits (QImode or +HImode), (2) is named, and (3) is an integer or pointer type (no +structs, floats, etc). Otherwise, it's passed on the stack. + +Second arg may be passed in r2, same restrictions (but not QImode), +even if the first arg is passed on the stack. + +Third and further args are passed on the stack. No padding is used, +stack "alignment" is 8 bits. + +m32cm, m32c +----------- +First arg may be passed in r0l or r0, same restrictions as above. + +Second and further args are passed on the stack. Padding is used +after QImode parameters (i.e. lower-addressed byte is the value, +higher-addressed byte is the padding), stack "alignment" is 16 bits. + + +Return Value +============ + +r8c, m16c +--------- + +QImode in r0l +HImode in r0 +near pointer in r0 +(desired) +SImode in r2r0 +far pointer in r2r0 +(actual) +Anything bigger than 16 bits is returned in memory, at mem0 (mem0 +through mem15 are provided by libgcc.a) + +Aggregate values (regardless of size) are returned by pushing a +pointer to a temporary area on the stack after the args are pushed. +The function fills in this area with the value. Note that this +pointer on the stack does not affect how register arguments, if any, +are configured. + +m32cm, m32c +----------- +Same. + + +Registers Preserved Across Calls +================================ + +r8c, m16c +--------- +sb, fb, sp (i.e. nearly all registers are call clobbered) + +m32cm, m32c +----------- +r1, r2, r3, a0, a1, sb, fb, sp +(except when used for return values) + + +Interrupt Handlers +================== + +The stack frame is slightly different for interrupt handlers, because +(1) we don't have a usable parent frame, and (2) we have to use +special instructions to return and thus must save/restore everything +differently. + + +-------------------- + | program state +osp -> +-------------------- + | return address + +-------------------- + | saved r0..fp (pushm) +fp -> +-------------------- + | local data + +-------------------- + | saved regs mem0..mem15 + +-------------------- + | outgoing args (opt) +sp -> +-------------------- + -- cgit v1.2.3