mini/exception_asm.S

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/*
mini - a Free Software replacement for the Nintendo/BroadOn IOS.
exception handling
Copyright (C) 2008, 2009 Hector Martin "marcan" <marcan@marcansoft.com>
This program 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, version 2.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
.globl v_undf
.globl v_swi
.globl v_instr_abrt
.globl v_data_abrt
.globl v_reserved
.globl v_fiq
.globl exc_setup_stack
.extern __excstack_addr
.extern exc_handler
exc_setup_stack:
mrs r0, cpsr
@ Switch to FIQ mode
msr cpsr_c, #0xd1
@ Setup exception stack
ldr sp, =__excstack_addr
@ Switch to SVC mode
msr cpsr_c, #0xd3
@ Setup exception stack
ldr sp, =__excstack_addr
@ Switch to ABORT mode
msr cpsr_c, #0xd7
@ Setup exception stack
ldr sp, =__excstack_addr
@ Switch to UNDF mode
msr cpsr_c, #0xdb
@ Setup exception stack
ldr sp, =__excstack_addr
@ Restore mode
msr cpsr_c, r0
bx lr
.pool
v_undf:
stmfd sp!, {lr}
stmfd sp, {r0-lr}^
sub sp, sp, #0x3c
mov r2, sp
mrs r1, spsr
mov r0, #1
blx exc_handler
ldmfd sp!, {r0-r12}
add sp, sp, #8
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ldmfd sp!, {lr}
movs pc, lr
v_swi:
stmfd sp!, {lr}
stmfd sp, {r0-lr}^
sub sp, sp, #0x3c
mov r2, sp
mrs r1, spsr
mov r0, #2
blx exc_handler
ldmfd sp!, {r0-r12}
add sp, sp, #8
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ldmfd sp!, {lr}
movs pc, lr
v_instr_abrt:
stmfd sp!, {lr}
stmfd sp, {r0-lr}^
sub sp, sp, #0x3c
mov r2, sp
mrs r1, spsr
mov r0, #3
blx exc_handler
ldmfd sp!, {r0-r12}
add sp, sp, #8
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ldmfd sp!, {lr}
subs pc, lr, #4
v_data_abrt:
stmfd sp!, {lr}
stmfd sp, {r0-lr}^
sub sp, sp, #0x3c
mov r2, sp
mrs r1, spsr
mov r0, #4
blx exc_handler
ldmfd sp!, {r0-r12}
add sp, sp, #8
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ldmfd sp!, {lr}
subs pc, lr, #8
v_reserved:
stmfd sp!, {lr}
stmfd sp, {r0-lr}^
sub sp, sp, #0x3c
mov r2, sp
mrs r1, spsr
mov r0, #5
blx exc_handler
ldmfd sp!, {r0-r12}
add sp, sp, #8
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ldmfd sp!, {lr}
movs pc, lr
v_fiq:
stmfd sp!, {lr}
stmfd sp, {r0-lr}^
sub sp, sp, #0x3c
mov r2, sp
mrs r1, spsr
mov r0, #7
blx exc_handler
ldmfd sp!, {r0-r12}
add sp, sp, #8
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ldmfd sp!, {lr}
subs pc, lr, #4