rockbox/firmware/target/arm/crt0.S, branch master

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

2012-04-06T11:46:32+00:00

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

AS3525v1/2: Enable nested handling of interrupts

2012-01-08T22:29:25+00:00

Mostly for the sake of reducing latency for audio servicing where other service
routines can take a long time to complete, leading to occasional drops of a
few samples, especially in recording, where they are fairly frequent.

One mystery that remains is GPIOA IRQ being interrupted causes strange
undefined instruction exceptions, most easily produced on my Fuze V2 with a
scrollwheel. Making GPIOA the top ISR for now, thus not interruptible, cures it.

SVC mode is used during the actual calls. Hopefully the SVC stack size is
sufficient. Prologue and epilogue code only uses the IRQ stack and is large
enough.

Any routine code that should not be interrupted should disable IRQ itself from
here on in.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31642 a1c6a512-1295-4272-9138-f99709370657

Switch to SYS mode on arm FS#12322 by me

2011-10-11T16:06:03+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30741 a1c6a512-1295-4272-9138-f99709370657

arm/crt0.S: comment why the reset vector doesn't use absolute addressing

2010-06-18T18:31:14+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26929 a1c6a512-1295-4272-9138-f99709370657

as3525*: enable MMU in bootloader

2010-06-18T17:33:51+00:00

Reserve 1MB of DRAM for loading rockbox and use the rest as BSS
Write sdram setup in assembler and move it to a separate file, together
with MMU init code

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26926 a1c6a512-1295-4272-9138-f99709370657

Sansa AMS: call the exception handler with the correct address when the exception happened in Thumb state

2010-06-12T16:55:51+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26818 a1c6a512-1295-4272-9138-f99709370657

arm/crt0.S: s58l* don't use this file, no need for 'DFUC' string

2010-06-08T23:26:21+00:00

adjust vectors offsets

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26709 a1c6a512-1295-4272-9138-f99709370657

as3525: Fix previous commit, IRAM_ORIG can not be represented as an immediate value on targets with 2MB of ram

2010-03-17T05:10:41+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25230 a1c6a512-1295-4272-9138-f99709370657

as3525*: revert r25198 and inline memory_init in crt0.S

2010-03-17T05:02:42+00:00

We do not need a stack pointer at this step, and we are sure to not use
memory not initialized yet (like bss)

Fixes FS#11114 (tested on Fuze)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25229 a1c6a512-1295-4272-9138-f99709370657

as3525* : make sure sp is setup in bootloader

2010-03-15T11:29:19+00:00

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25199 a1c6a512-1295-4272-9138-f99709370657