u-boot.git/cpu/mips, branch v1.3.3

[MIPS] cpu/mips/cache.S: Fix build warning

2008-05-06T04:22:52+00:00

Some old GNU assemblers, such as v2.14 (ELDK 3.1.1), v2.16 (ELDK 4.1.0),
warns illegal global symbol references by bal (and jal also) instruction.
This does not happen with the latest binutils v2.18.

Here's an example on gth2_config:

mips_4KC-gcc  -D__ASSEMBLY__ -g  -Os   -D__KERNEL__ -DTEXT_BASE=0x90000000 -I/home/skuribay/devel/u-boot.git/include -fno-builtin -ffreestanding -nostdinc -isy
stem /opt/eldk311/usr/bin/../lib/gcc-lib/mips-linux/3.3.3/include -pipe  -DCONFIG_MIPS -D__MIPS__ -G 0 -mabicalls -fpic -pipe -msoft-float -march=4kc -mtune=4k
c -EB -c -o cache.o cache.S
cache.S: Assembler messages:
cache.S:243: Warning: Pretending global symbol used as branch target is local.
cache.S:250: Warning: Pretending global symbol used as branch target is local.

In principle, gas might be sensitive to global symbol references in PIC
code because they should be processed through GOT (global offset table).
But if `bal' instruction is used, it results in PC-based offset jump.
This is the cause of this warning.

In practice, we know it doesn't matter whether PC-based reference or GOT-
based. As for this case, both will work before/after relocation. But let's
fix the code.

This patch explicitly sets up a target address, then jump there.
Here's an example of disassembled code with/without this patch.

 90000668:       1485ffef        bne     a0,a1,90000628 
 9000066c:       ac80fffc        sw      zero,-4(a0)
 90000670:       01402821        move    a1,t2
-90000674:       0411ffba        bal     90000560 
-90000678:       01803021        move    a2,t4
-9000067c:       01602821        move    a1,t3
-90000680:       0411ffcc        bal     900005b4 
-90000684:       01a03021        move    a2,t5
-90000688:       03000008        jr      t8
-9000068c:       00000000        nop
+90000674:       01803021        move    a2,t4
+90000678:       8f8f83ec        lw      t7,-31764(gp)
+9000067c:       01e0f809        jalr    t7
+90000680:       00000000        nop
+90000684:       01602821        move    a1,t3
+90000688:       01a03021        move    a2,t5
+9000068c:       8f8f81e0        lw      t7,-32288(gp)
+90000690:       01e0f809        jalr    t7
+90000694:       00000000        nop
+90000698:       03000008        jr      t8
+9000069c:       00000000        nop

Signed-off-by: Shinya Kuribayashi

Allow building mips versions with ELDK 3.1.1

2008-05-05T11:24:12+00:00

.gpword works only with local symbols on certain binutils versions

Signed-off-by: Vlad Lungu

[MIPS] cpu/mips/config.mk: Fix GNU assembler minor version picker

2008-05-03T04:51:44+00:00

Current trick to pick up GNU assembler minor version uses a dot(.) as a
delimiter, and take the second field to obtain minor version number. But
as can be expected, this doesn't work with a version string which has
dots more than needs.

Here's an example:

$ mips-linux-gnu-as --version | grep 'GNU assembler'
GNU assembler (Sourcery G++ Lite 4.2-129) 2.18.50.20080215
$ mips-linux-gnu-as --version | grep 'GNU assembler' | cut -d. -f2
2-129) 2
$

This patch restricts the version format to 2.XX.XX... This will work
in most cases.

$ mips-linux-gnu-as --version | grep 'GNU assembler' | egrep -o '2\.[0-9\.]+'
2.18.50.20080215
$ mips-linux-gnu-as --version | grep 'GNU assembler' | egrep -o '2\.[0-9\.]+' | cut -d. -f2
18
$

Signed-off-by: Shinya Kuribayashi

[MIPS] cpu/mips/cache.S: Add dcache_enable

2008-05-03T04:51:28+00:00

Recent bootelf command fixes (017e9b7925f74878d0e9475388cca9bda5ef9482,
"allow ports to override bootelf behavior") requires ports to have this
function.

Signed-off-by: Shinya Kuribayashi 
Acked-by: Jean-Christophe PLAGNIOL-VILLARD

Use jr as register jump instruction

2008-04-18T07:47:29+00:00

Current assembler codes are inconsistent in the way of register jump
instruction usage; some use jr, some use j. Of course GNU as allows both
usages, but as can be expected from `Jump Register' the mnemonic `jr' is
more intuitive than `j'. For example, Linux doesn't have `j ' usage
at all.

Signed-off-by: Shinya Kuribayashi

cpu/mips/cpu.c: Fix flush_cache bug

2008-04-17T21:54:23+00:00

Cache operations have to take line address (addr), not start_addr.
I noticed this bug when debugging ping failure.

Signed-off-by: Shinya Kuribayashi

[MIPS] Extend MIPS_MAX_CACHE_SIZE upto 64kB

2008-03-25T12:30:07+00:00

Signed-off-by: Shinya Kuribayashi

[MIPS] Fix dcache_status()

2008-03-25T12:30:07+00:00

You can't judge UNCACHED by Config.K0 LSB.

Signed-off-by: Shinya Kuribayashi

[MIPS] Introduce _machine_restart

2008-03-25T12:30:07+00:00

Handles machine specific functions by using weak functions.

Signed-off-by: Shinya Kuribayashi

[MIPS] Cleanup CP0 Status initialization

2008-03-25T12:30:07+00:00

Add setup_c0_status from Linux. For the moment we disable interrupts, set
CU0, mark the kernel mode, and clear ERL and EXL. This is good enough for
reset-time configuration and will work well across most processors.

Signed-off-by: Shinya Kuribayashi