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arm: factor all exception handlers out of the crt0.S files

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Remove the implementations of all exceptions handlers from the
various crt0.S files and have a single implementation in system-arm.h
The new implementation is weak so that it can be overwritten by some
specific code (like the unwinder)

Change-Id: Ib3e041ed6037376bbe0e79286057e1051640dd90
Reviewed-on: http://gerrit.rockbox.org/205
Reviewed-by: Marcin Bukat <marcin.bukat@gmail.com>
This commit is contained in:
Amaury Pouly 2012-04-02 15:11:21 +02:00
parent bb0e4cc543
commit f33330c0ff
11 changed files with 50 additions and 312 deletions
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32
firmware/target/arm/imx233/crt0.S
View file

@ -161,38 +161,6 @@ remap:
1:
b 1b
/* 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:
sub r0, lr, #4 @ r0 points to the faulty ARM instruction
#ifdef USE_THUMB
mrs r1, spsr
tst r1, #(1<<5) @ T bit set ?
subne r0, lr, #2 @ if yes, r0 points to the faulty THUMB instruction
#endif /* USE_THUMB */
mov r1, #0
b UIE
/* We run sys mode most of the time, and should never see a software
* exception being thrown. Make it illegal and call UIE. */
software_int_handler:
reserved_handler:
sub r0, lr, #4
mov r1, #4
b UIE
prefetch_abort_handler:
sub r0, lr, #4
mov r1, #1
b UIE
data_abort_handler:
sub r0, lr, #8
mov r1, #2
b UIE
/* 256 words of IRQ stack */
.space 256*4
irq_stack: