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Switch to SYS mode on arm FS#12322 by me

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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
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23
firmware/target/arm/tcc780x/crt0.S
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@ -120,17 +120,16 @@ copied_start:
ldr r11, =dma_play_data
#endif
/* Let abort and undefined modes use IRQ stack */
mov r0,#0xd7
msr cpsr, r0
/* Let svc, abort and undefined modes use irq stack */
msr cpsr, #0xd3
ldr sp, =irq_stack
mov r0,#0xdb
msr cpsr, r0
msr cpsr, #0xd7
ldr sp, =irq_stack
msr cpsr, #0xdb
ldr sp, =irq_stack
/* Switch to supervisor mode */
mov r0,#0xd3
msr cpsr, r0
/* Switch to sys mode */
msr cpsr, #0xdf
ldr sp, =stackend
/* Enable MMU & caches. At present this is just doing what the OF does.
@ -293,12 +292,14 @@ undef_instr_handler:
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?
/* 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:
movs pc, lr
sub r0, lr, #4
mov r1, #4
b UIE
prefetch_abort_handler:
sub r0, lr, #4