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/* vectors.s 1.0 - 95/08/08
*
* This file contains the assembly code for the PowerPC 403
* interrupt veneers for RTEMS.
*
* Author: Andrew Bray <andy@i-cubed.demon.co.uk>
*
* COPYRIGHT (c) 1995 by i-cubed ltd.
*
* To anyone who acknowledges that this file is provided "AS IS"
* without any express or implied warranty:
* permission to use, copy, modify, and distribute this file
* for any purpose is hereby granted without fee, provided that
* the above copyright notice and this notice appears in all
* copies, and that the name of i-cubed limited not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* i-cubed limited makes no representations about the suitability
* of this software for any purpose.
*
*/
/*
* The issue with this file is getting it loaded at the right place.
* The first vector MUST be at address 0x????0100.
* How this is achieved is dependant on the tool chain.
*
* However the basic mechanism for ELF assemblers is to create a
* section called ".vectors", which will be loaded to an address
* between 0x????0000 and 0x????0100 (inclusive) via a link script.
*
* The basic mechanism for XCOFF assemblers is to place it in the
* normal text section, and arrange for this file to be located
* at an appropriate position on the linker command line.
*
* The variable 'PPC_VECTOR_FILE_BASE' must be defined to be the
* offset from 0x????0000 to the first location in the file. This
* will usually be 0x0000 or 0x0100.
*/
#include "asm.h"
#ifndef PPC_VECTOR_FILE_BASE
#error "PPC_VECTOR_FILE_BASE is not defined."
#endif
/* Where this file will be loaded */
.set file_base, PPC_VECTOR_FILE_BASE
/* Offset to store reg 0 */
.set IP_LINK, 0
#if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27)
.set IP_0, (IP_LINK + 56)
#else
.set IP_0, (IP_LINK + 8)
#endif
.set IP_2, (IP_0 + 4)
.set IP_3, (IP_2 + 4)
.set IP_4, (IP_3 + 4)
.set IP_5, (IP_4 + 4)
.set IP_6, (IP_5 + 4)
.set IP_7, (IP_6 + 4)
.set IP_8, (IP_7 + 4)
.set IP_9, (IP_8 + 4)
.set IP_10, (IP_9 + 4)
.set IP_11, (IP_10 + 4)
.set IP_12, (IP_11 + 4)
.set IP_13, (IP_12 + 4)
.set IP_28, (IP_13 + 4)
.set IP_29, (IP_28 + 4)
.set IP_30, (IP_29 + 4)
.set IP_31, (IP_30 + 4)
.set IP_CR, (IP_31 + 4)
.set IP_CTR, (IP_CR + 4)
.set IP_XER, (IP_CTR + 4)
.set IP_LR, (IP_XER + 4)
.set IP_PC, (IP_LR + 4)
.set IP_MSR, (IP_PC + 4)
.set IP_END, (IP_MSR + 16)
/* Vector offsets */
.set begin_vector,0x0000
.set crit_vector,0x0100
.set mach_vector,0x0200
.set prot_vector,0x0300
.set ext_vector,0x0500
.set align_vector,0x0600
.set prog_vector,0x0700
.set sys_vector,0x0C00
.set pit_vector,0x1000
.set fit_vector,0x1010
.set wadt_vector,0x1020
.set debug_vector,0x2000
/* Go to the right section */
#if PPC_ASM == PPC_ASM_ELF
.section .vectors,"awx",@progbits
#elif PPC_ASM == PPC_ASM_XCOFF
.csect .text[PR]
#endif
PUBLIC_VAR (__vectors)
SYM (__vectors):
/* Critical error handling */
.org crit_vector - file_base
mtsprg1 r0
mfsprg2 r0
mtmsr r0
#if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27)
#if (PPC_HAS_FPU)
stwu r1, -(20*4 + 18*8 + IP_END)(r1)
#else
stwu r1, -(20*4 + IP_END)(r1)
#endif
#else
stwu r1, -(IP_END)(r1)
#endif
mfsprg1 r0
stw r0, IP_0(r1)
li r0, PPC_IRQ_CRIT
b PROC (_ISR_HandlerC)
/* Machine check exception */
.org mach_vector - file_base
mtsprg1 r0
mfsprg2 r0
mtmsr r0
#if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27)
#if (PPC_HAS_FPU)
stwu r1, -(20*4 + 18*8 + IP_END)(r1)
#else
stwu r1, -(20*4 + IP_END)(r1)
#endif
#else
stwu r1, -(IP_END)(r1)
#endif
mfsprg1 r0
stw r0, IP_0(r1)
li r0, PPC_IRQ_MCHECK
b PROC (_ISR_HandlerC)
/* Protection exception */
.org prot_vector - file_base
mtsprg0 r0
mfsprg2 r0
mtmsr r0
#if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27)
#if (PPC_HAS_FPU)
stwu r1, -(20*4 + 18*8 + IP_END)(r1)
#else
stwu r1, -(20*4 + IP_END)(r1)
#endif
#else
stwu r1, -(IP_END)(r1)
#endif
mfsprg0 r0
stw r0, IP_0(r1)
li r0, PPC_IRQ_PROTECT
b PROC (_ISR_Handler)
/* External interrupt */
.org ext_vector - file_base
mtsprg0 r0
mfsprg2 r0
mtmsr r0
#if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27)
#if (PPC_HAS_FPU)
stwu r1, -(20*4 + 18*8 + IP_END)(r1)
#else
stwu r1, -(20*4 + IP_END)(r1)
#endif
#else
stwu r1, -(IP_END)(r1)
#endif
mfsprg0 r0
stw r0, IP_0(r1)
li r0, PPC_IRQ_EXTERNAL
b PROC (_ISR_Handler)
/* Align exception */
.org align_vector - file_base
.extern align_h
b align_h
/* Program exception */
.org prog_vector - file_base
mtsprg0 r0
mfsprg2 r0
mtmsr r0
#if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27)
#if (PPC_HAS_FPU)
stwu r1, -(20*4 + 18*8 + IP_END)(r1)
#else
stwu r1, -(20*4 + IP_END)(r1)
#endif
#else
stwu r1, -(IP_END)(r1)
#endif
mfsprg0 r0
stw r0, IP_0(r1)
li r0, PPC_IRQ_PROGRAM
b PROC (_ISR_Handler)
/* System call */
.org sys_vector - file_base
mtsprg0 r0
mfsprg2 r0
mtmsr r0
#if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27)
#if (PPC_HAS_FPU)
stwu r1, -(20*4 + 18*8 + IP_END)(r1)
#else
stwu r1, -(20*4 + IP_END)(r1)
#endif
#else
stwu r1, -(IP_END)(r1)
#endif
mfsprg0 r0
stw r0, IP_0(r1)
li r0, PPC_IRQ_SCALL
b PROC (_ISR_Handler)
/* PIT interrupt */
.org pit_vector - file_base
b pit
/* FIT interrupt */
.org fit_vector - file_base
b fit
/* Watchdog interrupt */
.org wadt_vector - file_base
b watch
/* PIT interrupt */
pit:
mtsprg0 r0
mfsprg2 r0
mtmsr r0
#if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27)
#if (PPC_HAS_FPU)
stwu r1, -(20*4 + 18*8 + IP_END)(r1)
#else
stwu r1, -(20*4 + IP_END)(r1)
#endif
#else
stwu r1, -(IP_END)(r1)
#endif
mfsprg0 r0
stw r0, IP_0(r1)
li r0, PPC_IRQ_PIT
b PROC (_ISR_Handler)
/* FIT interrupt */
fit:
mtsprg0 r0
mfsprg2 r0
mtmsr r0
#if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27)
#if (PPC_HAS_FPU)
stwu r1, -(20*4 + 18*8 + IP_END)(r1)
#else
stwu r1, -(20*4 + IP_END)(r1)
#endif
#else
stwu r1, -(IP_END)(r1)
#endif
mfsprg0 r0
stw r0, IP_0(r1)
li r0, PPC_IRQ_FIT
b PROC (_ISR_Handler)
/* Watchdog interrupt */
watch:
mtsprg1 r0
mfsprg2 r0
mtmsr r0
#if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27)
#if (PPC_HAS_FPU)
stwu r1, -(20*4 + 18*8 + IP_END)(r1)
#else
stwu r1, -(20*4 + IP_END)(r1)
#endif
#else
stwu r1, -(IP_END)(r1)
#endif
mfsprg1 r0
stw r0, IP_0(r1)
li r0, PPC_IRQ_WATCHDOG
b PROC (_ISR_HandlerC)
/* Debug exception */
debug:
mtsprg1 r0
mfsprg2 r0
mtmsr r0
#if (PPC_ABI == PPC_ABI_POWEROPEN || PPC_ABI == PPC_ABI_GCC27)
#if (PPC_HAS_FPU)
stwu r1, -(20*4 + 18*8 + IP_END)(r1)
#else
stwu r1, -(20*4 + IP_END)(r1)
#endif
#else
stwu r1, -(IP_END)(r1)
#endif
mfsprg1 r0
stw r0, IP_0(r1)
li r0, PPC_IRQ_DEBUG
b PROC (_ISR_HandlerC)
/* Debug exception */
.org debug_vector - file_base
b debug
|
