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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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35
firmware/target/arm/crt0-pp502x-bl-usb.S
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@ -239,6 +239,20 @@ start_stub_end:
strhi r0, [r1], #4
bhi 1b
/* Set up stack for IRQ mode */
msr cpsr_c, #0xd2 /* IRQ/FIQ disabled */
ldr sp, =irq_stack
/* Let svc, abort and undefined modes use irq stack */
msr cpsr_c, #0xd3
ldr sp, =irq_stack
msr cpsr_c, #0xd7 /* IRQ/FIQ disabled */
ldr sp, =irq_stack
msr cpsr_c, #0xdb /* IRQ/FIQ disabled */
ldr sp, =irq_stack
/* Switch back to sys mode */
msr cpsr_c, #0xdf
/* Set up some stack and munge it with 0xdeadbeef */
ldr r0, =0xdeadbeef
ldr r1, =stackbegin
@ -248,18 +262,6 @@ start_stub_end:
strhi r0, [r1], #4
bhi 1b
/* Set up stack for IRQ mode */
msr cpsr_c, #0xd2 /* IRQ/FIQ disabled */
ldr sp, =irq_stack
/* Let abort and undefined modes use IRQ stack */
msr cpsr_c, #0xd7 /* IRQ/FIQ disabled */
ldr sp, =irq_stack
msr cpsr_c, #0xdb /* IRQ/FIQ disabled */
ldr sp, =irq_stack
/* Switch back to supervisor mode */
msr cpsr_c, #0xd3
/* execute the loader - this will load an image to 0x10000000 */
ldr r0, =main
mov lr, pc
@ -335,12 +337,15 @@ 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
mov r1, #1