Create a new MACHINE_ARCH for Freescale PowerPC e500v2
Summary:
The Freescale e500v2 PowerPC core does not use a standard FPU.
Instead, it uses a Signal Processing Engine (SPE)--a DSP-style vector processor
unit, which doubles as a FPU. The PowerPC SPE ABI is incompatible with the
stock powerpc ABI, so a new MACHINE_ARCH was created to deal with this.
Additionaly, the SPE opcodes overlap with Altivec, so these are mutually
exclusive. Taking advantage of this fact, a new file, powerpc/booke/spe.c, was
created with the same function set as in powerpc/powerpc/altivec.c, so it
becomes effectively a drop-in replacement. setjmp/longjmp were modified to save
the upper 32-bits of the now-64-bit GPRs (upper 32-bits are only accessible by
the SPE).
Note: This does _not_ support the SPE in the e500v1, as the e500v1 SPE does not
support double-precision floating point.
Also, without a new MACHINE_ARCH it would be impossible to provide binary
packages which utilize the SPE.
Additionally, no work has been done to support ports, work is needed for this.
This also means no newer gcc can yet be used. However, gcc's powerpc support
has been refactored which would make adding a powerpcspe-freebsd target very
easy.
Test Plan:
This was lightly tested on a RouterBoard RB800 and an AmigaOne A1222
(P1022-based) board, compiled against the new ABI. Base system utilities
(/bin/sh, /bin/ls, etc) still function appropriately, the system is able to boot
multiuser.
Reviewed By: bdrewery, imp
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D5683
2016-10-22 01:57:15 +00:00
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/*-
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* Copyright (c) 2016 Justin Hibbits
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* $NetBSD: sigsetjmp.S,v 1.4 1998/10/03 12:30:38 tsubai Exp $ */
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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/*
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* C library -- sigsetjmp, siglongjmp
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*
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* siglongjmp(a,v)
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* will generate a "return(v?v:1)" from the last call to
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* sigsetjmp(a, savemask)
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* by restoring registers from the stack.
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* The previous signal state is restored if savemask is non-zero
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*
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* jmpbuf layout:
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* +------------+
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* | savemask |
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* +------------+
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* | sig state |
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* | |
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* | (4 words) |
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* | |
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* +------------+
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* | saved regs |
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* | ... |
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*/
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#include <sys/syscall.h>
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ENTRY(sigsetjmp)
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mr %r6,%r3
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stw %r4,0(%r3)
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or. %r7,%r4,%r4
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beq 1f
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li %r3,1 /* SIG_BLOCK, but doesn't matter */
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/* since set == NULL */
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li %r4,0 /* set = NULL */
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mr %r5,%r6 /* &oset */
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addi %r5,%r5,4
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li %r0, SYS_sigprocmask /* sigprocmask(SIG_BLOCK, NULL, &oset)*/
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sc /* assume no error XXX */
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1:
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mflr %r11
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mfcr %r12
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mr %r10,%r1
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mr %r9,%r2
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/* FPRs */
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evstdd %r9,24+0*8(%r6)
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evstdd %r10,24+1*8(%r6)
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evstdd %r11,24+2*8(%r6)
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evstdd %r12,24+3*8(%r6)
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evstdd %r13,24+4*8(%r6)
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evstdd %r14,24+5*8(%r6)
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evstdd %r15,24+6*8(%r6)
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evstdd %r16,24+7*8(%r6)
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evstdd %r17,24+8*8(%r6)
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evstdd %r18,24+9*8(%r6)
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evstdd %r19,24+10*8(%r6)
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evstdd %r20,24+11*8(%r6)
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evstdd %r21,24+12*8(%r6)
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evstdd %r22,24+13*8(%r6)
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evstdd %r23,24+14*8(%r6)
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evstdd %r24,24+15*8(%r6)
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evstdd %r25,24+16*8(%r6)
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evstdd %r26,24+17*8(%r6)
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evstdd %r27,24+18*8(%r6)
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evstdd %r28,24+19*8(%r6)
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evstdd %r29,24+20*8(%r6)
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evstdd %r30,24+21*8(%r6)
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evstdd %r31,24+22*8(%r6)
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li %r3,0
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blr
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END(sigsetjmp)
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ENTRY(siglongjmp)
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/* FPRs */
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2016-10-29 01:22:55 +00:00
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evldd %r9,24+0*8(%r3)
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evldd %r10,24+1*8(%r3)
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evldd %r11,24+2*8(%r3)
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evldd %r12,24+3*8(%r3)
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evldd %r13,24+4*8(%r3)
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evldd %r14,24+5*8(%r3)
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evldd %r15,24+6*8(%r3)
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evldd %r16,24+7*8(%r3)
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evldd %r17,24+8*8(%r3)
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evldd %r18,24+9*8(%r3)
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evldd %r19,24+10*8(%r3)
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evldd %r20,24+11*8(%r3)
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evldd %r21,24+12*8(%r3)
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evldd %r22,24+13*8(%r3)
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evldd %r23,24+14*8(%r3)
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evldd %r24,24+15*8(%r3)
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evldd %r25,24+16*8(%r3)
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evldd %r26,24+17*8(%r3)
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evldd %r27,24+18*8(%r3)
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evldd %r28,24+19*8(%r3)
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evldd %r29,24+20*8(%r3)
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evldd %r30,24+21*8(%r3)
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evldd %r31,24+22*8(%r3)
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Create a new MACHINE_ARCH for Freescale PowerPC e500v2
Summary:
The Freescale e500v2 PowerPC core does not use a standard FPU.
Instead, it uses a Signal Processing Engine (SPE)--a DSP-style vector processor
unit, which doubles as a FPU. The PowerPC SPE ABI is incompatible with the
stock powerpc ABI, so a new MACHINE_ARCH was created to deal with this.
Additionaly, the SPE opcodes overlap with Altivec, so these are mutually
exclusive. Taking advantage of this fact, a new file, powerpc/booke/spe.c, was
created with the same function set as in powerpc/powerpc/altivec.c, so it
becomes effectively a drop-in replacement. setjmp/longjmp were modified to save
the upper 32-bits of the now-64-bit GPRs (upper 32-bits are only accessible by
the SPE).
Note: This does _not_ support the SPE in the e500v1, as the e500v1 SPE does not
support double-precision floating point.
Also, without a new MACHINE_ARCH it would be impossible to provide binary
packages which utilize the SPE.
Additionally, no work has been done to support ports, work is needed for this.
This also means no newer gcc can yet be used. However, gcc's powerpc support
has been refactored which would make adding a powerpcspe-freebsd target very
easy.
Test Plan:
This was lightly tested on a RouterBoard RB800 and an AmigaOne A1222
(P1022-based) board, compiled against the new ABI. Base system utilities
(/bin/sh, /bin/ls, etc) still function appropriately, the system is able to boot
multiuser.
Reviewed By: bdrewery, imp
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D5683
2016-10-22 01:57:15 +00:00
|
|
|
|
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lwz %r7,0(%r3)
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mr %r6,%r4
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mtlr %r11
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mtcr %r12
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mr %r1,%r10
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or. %r7,%r7,%r7
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beq 1f
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mr %r4,%r3
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li %r3,3 /* SIG_SETMASK */
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addi %r4,%r4,4 /* &set */
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li %r5,0 /* oset = NULL */
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li %r0,SYS_sigprocmask /* sigprocmask(SIG_SET, &set, NULL) */
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sc /* assume no error XXX */
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1:
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or. %r3,%r6,%r6
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bnelr
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li %r3,1
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blr
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END(siglongjmp)
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.section .note.GNU-stack,"",%progbits
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