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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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36
firmware/target/arm/crt0.S
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@ -100,15 +100,6 @@ newstart:
strhi r4, [r2], #4
bhi 1b
/* Set up some stack and munge it with 0xdeadbeef */
ldr sp, =stackend
ldr r2, =stackbegin
ldr r3, =0xdeadbeef
1:
cmp sp, r2
strhi r3, [r2], #4
bhi 1b
/* Set up stack for IRQ mode */
msr cpsr_c, #0xd2
ldr sp, =irq_stack
@ -117,14 +108,26 @@ newstart:
msr cpsr_c, #0xd1
ldr sp, =fiq_stack
/* Let abort and undefined modes use IRQ stack */
/* Let svc, abort and undefined modes use irq stack */
msr cpsr_c, #0xd3
ldr sp, =irq_stack
msr cpsr_c, #0xd7
ldr sp, =irq_stack
msr cpsr_c, #0xdb
ldr sp, =irq_stack
/* Switch back to supervisor mode */
msr cpsr_c, #0xd3
/* Switch to sys mode */
msr cpsr_c, #0xdf
/* Set up some stack and munge it with 0xdeadbeef */
ldr sp, =stackend
ldr r2, =stackbegin
ldr r3, =0xdeadbeef
1:
cmp sp, r2
strhi r3, [r2], #4
bhi 1b
ldr ip, =main @ make sure we are using the virtual address
bx ip
@ -142,11 +145,13 @@ 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
@ -165,5 +170,4 @@ irq_stack:
/* 256 words of FIQ stack */
.space 256*4
fiq_stack:
end: