[#5108] when mpu is on, jump to zero works.

Submitted By: Robin Getz

Open Date

2009-05-05 12:59:28 Close Date

2009-05-05 13:15:00

Priority:

Medium Assignee:

Robin Getz

Status:

Closed Fixed In Release:

N/A

Found In Release:

2010R1 Release:

Category:

N/A Board:

N/A

Processor:

ALL Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Fixed

Uboot version or rev.:

Toolchain version or rev.:

trunk

App binary format:

FLAT

Summary: when mpu is on, jump to zero works.

Details:

the code:

void jump_to_zero(void)

{

int (*foo)(void);

int i;

i = 0x0;

foo = (void *)i;

(*foo)();

}

causes:

Hardware Trace:

0 Target : <0x00004d08> { _trap_c + 0x0 }

Source : <0xffa00616> { _exception_to_level5 + 0x9e } CALL pcrel

1 Target : <0xffa00578> { _exception_to_level5 + 0x0 }

Source : <0xffa0045e> { _bfin_return_from_exception + 0x2a } RTX

2 Target : <0xffa00434> { _bfin_return_from_exception + 0x0 }

Source : <0xffa004c6> { _ex_trap_c + 0x46 } JUMP.S

3 Target : <0xffa00480> { _ex_trap_c + 0x0 }

Source : <0xffa006e0> { _trap + 0x58 } JUMP (P4)

4 Target : <0xffa00688> { _trap + 0x0 }

Source : <0x00000012> /* Maybe null pointer? */

5 Target : <0x00000000> { _do_one_initcall + 0xfffff000 }

Source : <0x00d202ce> [ traps_test + 0x28e ] JUMP (P2)

6 Target : <0x00d202c4> [ traps_test + 0x284 ]

Source : <0x00d205a8> [ traps_test + 0x568 ] CALL (P2)

7 Target : <0x00d205a6> [ traps_test + 0x566 ]

since:

root:/> cat /proc/cplbinfo/cpu0/icplb

ICPLBs are enabled: 0x7

Index Address Data Size U/RD U/WR S/WR Switch

0 0x00000000 01004 1K Y N N N

1 0x00000000 31205 4M Y N N N

LSB data should be set (valid bit).

-Robin

Follow-ups

--- Robin Getz 2009-05-05 13:15:00

Fixed on trunk.

-Robin

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[#5108] when mpu is on, jump to zero works.