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UIE handler for ARM/iPod. Currently does not support interrupts. Will

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probably also work for other ARM based targets, like iFP.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8388 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen 2006-01-19 15:03:34 +00:00
parent 4926682378
commit 127c3febc1
2 changed files with 51 additions and 1 deletions
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24
firmware/crt0.S
View file

@ -249,6 +249,9 @@ boot_table:
/* Set up stack for IRQ mode */
msr cpsr_c, #0xd2
ldr sp, =irq_stack
/* Let abort mode use IRQ stack */
msr cpsr_c, #0xd7
ldr sp, =irq_stack
/* Switch to supervisor mode */
msr cpsr_c, #0xd3
ldr sp, =stackend
@ -278,18 +281,37 @@ ecode:
ecodeend:
.global irq
.global UIE
/* All illegal exceptions call into UIE with exception address as first
parameter. This is calculated differently depending on which exception
we're in. Second parameter is exception number, used for a string lookup
in UIE.
*/
undef_instr_handler:
mov r0, lr
mov r1, #0
b UIE
/* We run supervisor mode most of the time, and should never see a software
exception being thrown. Perhaps make it illegal and call UIE?
*/
software_int_handler:
reserved_handler:
movs pc, lr
prefetch_abort_handler:
sub r0, lr, #4
mov r1, #1
b UIE
fiq_handler:
subs pc, lr, #4
data_abort_handler:
subs pc, lr, #8
sub r0, lr, #8
mov r1, #2
b UIE
irq_handler:
stmfd sp!, {r0-r3, r12, lr}

28
firmware/system.c
View file

@ -1119,6 +1119,34 @@ void irq(void)
}
#endif
static const char* const uiename[] = {
"Undefined instruction", "Prefetch abort", "Data abort"
};
/* Unexpected Interrupt or Exception handler. Currently only deals with
exceptions, but will deal with interrupts later.
*/
void UIE(unsigned int pc, unsigned int num)
{
char str[32];
lcd_clear_display();
#ifdef HAVE_LCD_BITMAP
lcd_setfont(FONT_SYSFIXED);
#endif
lcd_puts(0, 0, uiename[num]);
snprintf(str, sizeof(str), "at %08x", pc);
lcd_puts(0, 1, str);
lcd_update();
while (1)
{
/* TODO: perhaps add button handling in here when we get a polling
driver some day.
*/
}
}
/* TODO: The following two function have been lifted straight from IPL, and
hence have a lot of numeric addresses used straight. I'd like to use
#defines for these, but don't know what most of them are for or even what