1e78526274
loads, prints the copyright, and either hangs or locks solid. The PC tends to be in the data segment and the RA is in XentMM Doug really came up with the fix, I'm just the monkey typing. Doug says: The alpha can only support 64k of globals with $gp pointing at base+32k so that the code can use 16bit signed offsets from $gp to access it. .... it is possible to have multiple .got subsections and the linker handles this with the relocations for 'ldgp' pseudo instructions. [Without this patch] the code in exception.s has been linked to use a different gp from locore.s (where pal_kgp is set). Reviewed by: dfr
206 lines
4.9 KiB
ArmAsm
206 lines
4.9 KiB
ArmAsm
/* $FreeBSD$ */
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/* $NetBSD: locore.s,v 1.47 1998/03/22 07:26:32 thorpej Exp $ */
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/*
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* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <machine/asm.h>
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#include <assym.s>
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/**************************************************************************/
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/*
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* XentArith:
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* System arithmetic trap entry point.
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*/
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PALVECT(XentArith) /* setup frame, save registers */
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/* a0, a1, & a2 already set up */
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ldiq a3, ALPHA_KENTRY_ARITH
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mov sp, a4 ; .loc 1 __LINE__
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CALL(trap)
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jmp zero, exception_return
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END(XentArith)
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/**************************************************************************/
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/*
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* XentIF:
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* System instruction fault trap entry point.
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*/
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PALVECT(XentIF) /* setup frame, save registers */
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/* a0, a1, & a2 already set up */
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ldiq a3, ALPHA_KENTRY_IF
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mov sp, a4 ; .loc 1 __LINE__
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CALL(trap)
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jmp zero, exception_return
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END(XentIF)
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/**************************************************************************/
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/*
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* XentInt:
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* System interrupt entry point.
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*/
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PALVECT(XentInt) /* setup frame, save registers */
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/* a0, a1, & a2 already set up */
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mov sp, a3 ; .loc 1 __LINE__
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CALL(interrupt)
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jmp zero, exception_return
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END(XentInt)
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/**************************************************************************/
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/*
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* XentMM:
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* System memory management fault entry point.
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*/
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PALVECT(XentMM) /* setup frame, save registers */
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/* a0, a1, & a2 already set up */
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ldiq a3, ALPHA_KENTRY_MM
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mov sp, a4 ; .loc 1 __LINE__
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CALL(trap)
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jmp zero, exception_return
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END(XentMM)
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/**************************************************************************/
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/*
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* XentSys:
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* System call entry point.
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*/
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ESETUP(XentSys) ; .loc 1 __LINE__
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stq v0,(FRAME_V0*8)(sp) /* in case we need to restart */
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stq s0,(FRAME_S0*8)(sp)
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stq s1,(FRAME_S1*8)(sp)
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stq s2,(FRAME_S2*8)(sp)
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stq s3,(FRAME_S3*8)(sp)
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stq s4,(FRAME_S4*8)(sp)
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stq s5,(FRAME_S5*8)(sp)
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stq s6,(FRAME_S6*8)(sp)
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stq a0,(FRAME_A0*8)(sp)
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stq a1,(FRAME_A1*8)(sp)
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stq a2,(FRAME_A2*8)(sp)
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stq a3,(FRAME_A3*8)(sp)
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stq a4,(FRAME_A4*8)(sp)
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stq a5,(FRAME_A5*8)(sp)
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stq ra,(FRAME_RA*8)(sp)
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/* syscall number, passed in v0, is first arg, frame pointer second */
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mov v0,a0
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mov sp,a1 ; .loc 1 __LINE__
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br pv,XentSys1
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XentSys1: LDGP(pv)
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CALL(syscall)
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jmp zero, exception_return
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END(XentSys)
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/**************************************************************************/
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/*
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* XentUna:
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* System unaligned access entry point.
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*/
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LEAF(XentUna, 3) /* XXX should be NESTED */
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.set noat
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lda sp,-(FRAME_SW_SIZE*8)(sp)
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stq at_reg,(FRAME_AT*8)(sp)
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.set at
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stq ra,(FRAME_RA*8)(sp)
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bsr ra, exception_save_regs /* jmp/CALL trashes pv/t12 */
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/* a0, a1, & a2 already set up */
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ldiq a3, ALPHA_KENTRY_UNA
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mov sp, a4 ; .loc 1 __LINE__
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br pv, XentUna1
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XentUna1: LDGP(pv)
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CALL(trap)
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jmp zero, exception_return
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END(XentUna)
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/**************************************************************************/
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/*
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* console 'restart' routine to be placed in HWRPB.
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*/
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LEAF(XentRestart, 1) /* XXX should be NESTED */
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.set noat
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lda sp,-(FRAME_SIZE*8)(sp)
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stq at_reg,(FRAME_AT*8)(sp)
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.set at
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stq v0,(FRAME_V0*8)(sp)
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stq a3,(FRAME_A3*8)(sp)
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stq a4,(FRAME_A4*8)(sp)
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stq a5,(FRAME_A5*8)(sp)
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stq s0,(FRAME_S0*8)(sp)
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stq s1,(FRAME_S1*8)(sp)
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stq s2,(FRAME_S2*8)(sp)
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stq s3,(FRAME_S3*8)(sp)
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stq s4,(FRAME_S4*8)(sp)
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stq s5,(FRAME_S5*8)(sp)
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stq s6,(FRAME_S6*8)(sp)
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stq t0,(FRAME_T0*8)(sp)
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stq t1,(FRAME_T1*8)(sp)
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stq t2,(FRAME_T2*8)(sp)
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stq t3,(FRAME_T3*8)(sp)
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stq t4,(FRAME_T4*8)(sp)
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stq t5,(FRAME_T5*8)(sp)
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stq t6,(FRAME_T6*8)(sp)
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stq t7,(FRAME_T7*8)(sp)
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stq t8,(FRAME_T8*8)(sp)
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stq t9,(FRAME_T9*8)(sp)
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stq t10,(FRAME_T10*8)(sp)
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stq t11,(FRAME_T11*8)(sp)
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stq t12,(FRAME_T12*8)(sp)
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stq ra,(FRAME_RA*8)(sp)
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br pv,LXconsole_restart1
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LXconsole_restart1: LDGP(pv)
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ldq a0,(FRAME_RA*8)(sp) /* a0 = ra */
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ldq a1,(FRAME_T11*8)(sp) /* a1 = ai */
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ldq a2,(FRAME_T12*8)(sp) /* a2 = pv */
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CALL(console_restart)
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call_pal PAL_halt
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END(XentRestart)
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