len0rd/rockbox
1
0
Fork 1
mirror of https://github.com/Rockbox/rockbox.git synced 2025-12-09 13:15:18 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

Switch to SYS mode on arm FS#12322 by me

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30741 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Marcin Bukat 2011-10-11 16:06:03 +00:00
parent 9055915645
commit bf056d5372
16 changed files with 298 additions and 233 deletions
Download patch file Download diff file Expand all files Collapse all files

25
firmware/target/arm/tms320dm320/crt0.S
View file

@ -169,23 +169,25 @@ _start:
msr cpsr_c, #0xd2 /* Go into irq state */
ldr sp, =_irq_stack_start /* set the irq stack pointer */
/* This should not be needed, but set the stack location for abort and
* undefined to at least a known stack location (IRQ)
*/
msr cpsr_c, #0xd7 /* Go into abort state */
/* SVC, ABT, UNDEF share irq stack */
msr cpsr_c, #0xd3 /* Go into svc state */
ldr sp, =_irq_stack_start /* set svc stack pointer */
msr cpsr_c, #0xd7 /* Go into abort state */
ldr sp, =_irq_stack_start /* set the stack pointer */
msr cpsr_c, #0xdb /* Go into undefined state */
msr cpsr_c, #0xdb /* Go into undefined state */
ldr sp, =_irq_stack_start /* set the stack pointer */
/* Initialize program stack */
msr cpsr_c, #0xd3 /* Go into supervisor state */
msr cpsr_c, #0xdf /* Go into sys state */
ldr r0, =0xDEADBEEF /* Can be taken out; left for clarity */
ldr r1, =_pro_stack_end /* Stack counts backwards, so end is first*/
ldr r2, =_pro_stack_start
bl _init_section
ldr sp, =_pro_stack_start /* set the supervisor stack pointer */
ldr sp, =_pro_stack_start /* set the sys stack pointer */
/* MMU initialization */
bl ttb_init
@ -298,6 +300,8 @@ _delay_cycles:
* 0: Undefined Instruction *
* 1: Prefetch Abort *
* 2: Data Abort *
* 3: DIV0 *
* 4: SWI *
* The exceptions return operations are documented in section A2.6 of the *
* ARM Architecture Reference Manual. *
******************************************************************************/
@ -309,11 +313,12 @@ _undefined_instruction:
bl UIE
/* A2.6.4: Software Interrupt exception - These should not happen in Rockbox,
* but for now leave this as a placeholder and continue with the program.
* LR=PC of next instruction.
* make it illegal
*/
_software_interrupt:
mov pc, lr
sub r0, lr, #4
mov r1, #4
bl UIE
/* A2.6.5 Prefetch Abort - This is also the BKPT instruction since this is a
* v5 target. Pass it on to UIE since it is not currently used.