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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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49
firmware/target/arm/rk27xx/crt0.S
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@ -156,6 +156,25 @@ newstart2:
bhi 1b
#endif
/* Set up stack for IRQ mode */
msr cpsr_c, #0xd2
ldr sp, =_irqstackend
/* Set up stack for FIQ mode */
msr cpsr_c, #0xd1
ldr sp, =_fiqstackend
/* Let svc, abort and undefined modes use irq stack */
msr cpsr_c, #0xd3
ldr sp, =_irqstackend
msr cpsr_c, #0xd7
ldr sp, =_irqstackend
msr cpsr_c, #0xdb
ldr sp, =_irqstackend
/* Switch to sys mode */
msr cpsr_c, #0xdf
/* Set up some stack and munge it with 0xdeadbeef */
ldr sp, =stackend
ldr r2, =stackbegin
@ -165,22 +184,6 @@ newstart2:
strhi r3, [r2], #4
bhi 1b
/* Set up stack for IRQ mode */
msr cpsr_c, #0xd2
ldr sp, =_irqstackend
/* Set up stack for FIQ mode */
msr cpsr_c, #0xd1
ldr sp, =_fiqstackend
/* Let abort and undefined modes use IRQ stack */
msr cpsr_c, #0xd7
ldr sp, =_irqstackend
msr cpsr_c, #0xdb
ldr sp, =_irqstackend
/* Switch back to supervisor mode */
msr cpsr_c, #0xd3
bl main
@ -196,12 +199,6 @@ 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? */
software_int_handler:
reserved_handler:
movs pc, lr
prefetch_abort_handler:
sub r0, lr, #4
mov r1, #1
@ -211,3 +208,11 @@ data_abort_handler:
sub r0, lr, #8
mov r1, #2
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, #5
b UIE